server/hook.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 09 Feb 2011 18:04:04 +0100
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[doc] update some copyrights
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""
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Generalities
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------------
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Paraphrasing the `emacs`_ documentation, let us say that hooks are an important
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mechanism for customizing an application. A hook is basically a list of
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functions to be called on some well-defined occasion (this is called `running
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the hook`).
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.. _`emacs`: http://www.gnu.org/software/emacs/manual/html_node/emacs/Hooks.html
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Hooks
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~~~~~
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In |cubicweb|, hooks are subclasses of the :class:`~cubicweb.server.hook.Hook`
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class. They are selected over a set of pre-defined `events` (and possibly more
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conditions, hooks being selectable appobjects like views and components).  They
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should implement a :meth:`~cubicweb.server.hook.Hook.__call__` method that will
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be called when the hook is triggered.
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There are two families of events: data events (before / after any individual
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update of an entity / or a relation in the repository) and server events (such
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as server startup or shutdown).  In a typical application, most of the hooks are
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defined over data events.
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Also, some :class:`~cubicweb.server.hook.Operation` may be registered by hooks,
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which will be fired when the transaction is commited or rollbacked.
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The purpose of data event hooks is usually to complement the data model as
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defined in the schema, which is static by nature and only provide a restricted
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builtin set of dynamic constraints, with dynamic or value driven behaviours.
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For instance they can serve the following purposes:
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* enforcing constraints that the static schema cannot express (spanning several
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  entities/relations, exotic value ranges and cardinalities, etc.)
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* implement computed attributes
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It is functionally equivalent to a `database trigger`_, except that database
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triggers definition languages are not standardized, hence not portable (for
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instance, PL/SQL works with Oracle and PostgreSQL but not SqlServer nor Sqlite).
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.. _`database trigger`: http://en.wikipedia.org/wiki/Database_trigger
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.. hint::
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   It is a good practice to write unit tests for each hook. See an example in
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   :ref:`hook_test`
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Operations
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~~~~~~~~~~
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Operations are subclasses of the :class:`~cubicweb.server.hook.Operation` class
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that may be created by hooks and scheduled to happen just before (or after) the
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`precommit`, `postcommit` or `rollback` event. Hooks are being fired immediately
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on data operations, and it is sometime necessary to delay the actual work down
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to a time where all other hooks have run. Also while the order of execution of
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hooks is data dependant (and thus hard to predict), it is possible to force an
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order on operations.
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Operations may be used to:
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* implements a validation check which needs that all relations be already set on
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  an entity
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* process various side effects associated with a transaction such as filesystem
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  udpates, mail notifications, etc.
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Events
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------
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Hooks are mostly defined and used to handle `dataflow`_ operations. It
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means as data gets in (entities added, updated, relations set or
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unset), specific events are issued and the Hooks matching these events
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are called.
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You can get the event that triggered a hook by accessing its :attr:event
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attribute.
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.. _`dataflow`: http://en.wikipedia.org/wiki/Dataflow
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Entity modification related events
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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When called for one of these events, hook will have an `entity` attribute
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containing the entity instance.
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* `before_add_entity`, `before_update_entity`:
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  - on those events, you can check what attributes of the entity are modified in
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    `entity.cw_edited` (by definition the database is not yet updated in a before
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    event)
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  - you are allowed to further modify the entity before database
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    operations, using the dictionary notation on `cw_edited`. By doing
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    this, you'll avoid the need for a whole new rql query processing,
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    the only difference is that the underlying backend query (eg
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    usually sql) will contains the additional data. For example:
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    .. sourcecode:: python
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       self.entity.set_attributes(age=42)
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    will set the `age` attribute of the entity to 42. But to do so, it will
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    generate a rql query that will have to be processed, then trigger some
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    hooks, and so one (potentially leading to infinite hook loops or such
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    awkward situations..) You can avoid this by doing the modification that way:
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    .. sourcecode:: python
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       self.entity.cw_edited['age'] = 42
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    Here the attribute will simply be edited in the same query that the
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    one that triggered the hook.
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    Similarly, removing an attribute from `cw_edited` will cancel its
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    modification.
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  - on `before_update_entity` event, you can access to old and new values in
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    this hook, by using `entity.cw_edited.oldnewvalue(attr)`
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* `after_add_entity`, `after_update_entity`
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  - on those events, you can still check what attributes of the entity are
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    modified in `entity.cw_edited` but you can't get anymore the old value, nor
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    modify it.
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* `before_delete_entity`, `after_delete_entity`
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  - on those events, the entity has no `cw_edited` set.
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Relation modification related events
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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When called for one of these events, hook will have `eidfrom`, `rtype`, `eidto`
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attributes containing respectivly the eid of the subject entity, the relation
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type and the eid of the object entity.
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* `before_add_relation`, `before_delete_relation`
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  - on those events, you can still get original relation by issuing a rql query
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* `after_add_relation`, `after_delete_relation`
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This is an occasion to remind us that relations support the add / delete
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operation, but no update.
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Non data events
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~~~~~~~~~~~~~~~
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Hooks called on server start/maintenance/stop event (eg `server_startup`,
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`server_maintenance`, `server_shutdown`) have a `repo` attribute, but *their
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`_cw` attribute is None*.  The `server_startup` is called on regular startup,
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while `server_maintenance` is called on cubicweb-ctl upgrade or shell
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commands. `server_shutdown` is called anyway.
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Hooks called on backup/restore event (eg 'server_backup', 'server_restore') have
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a `repo` and a `timestamp` attributes, but *their `_cw` attribute is None*.
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Hooks called on session event (eg `session_open`, `session_close`) have no
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special attribute.
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API
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---
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Hooks control
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~~~~~~~~~~~~~
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It is sometimes convenient to explicitly enable or disable some hooks. For
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instance if you want to disable some integrity checking hook.  This can be
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controlled more finely through the `category` class attribute, which is a string
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giving a category name.  One can then uses the
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:class:`~cubicweb.server.session.hooks_control` context manager to explicitly
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enable or disable some categories.
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.. autoclass:: cubicweb.server.session.hooks_control
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The existing categories are:
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* ``security``, security checking hooks
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* ``worfklow``, workflow handling hooks
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* ``metadata``, hooks setting meta-data on newly created entities
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* ``notification``, email notification hooks
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* ``integrity``, data integrity checking hooks
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* ``activeintegrity``, data integrity consistency hooks, that you should **never**
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  want to disable
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* ``syncsession``, hooks synchronizing existing sessions
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* ``syncschema``, hooks synchronizing instance schema (including the physical database)
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* ``email``, email address handling hooks
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* ``bookmark``, bookmark entities handling hooks
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Nothing precludes one to invent new categories and use the
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:class:`~cubicweb.server.session.hooks_control` context manager to
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filter them in or out. Note that ending the transaction with commit()
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or rollback() will restore the hooks.
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Hooks specific selector
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~~~~~~~~~~~~~~~~~~~~~~~
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.. autoclass:: cubicweb.server.hook.match_rtype
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.. autoclass:: cubicweb.server.hook.match_rtype_sets
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Hooks and operations classes
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. autoclass:: cubicweb.server.hook.Hook
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.. autoclass:: cubicweb.server.hook.Operation
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.. autoclass:: cubicweb.server.hook.LateOperation
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.. autoclass:: cubicweb.server.hook.DataOperationMixIn
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"""
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from __future__ import with_statement
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__docformat__ = "restructuredtext en"
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from warnings import warn
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from logging import getLogger
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from itertools import chain
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from logilab.common.decorators import classproperty
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from logilab.common.deprecation import deprecated, class_renamed
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from logilab.common.logging_ext import set_log_methods
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from cubicweb import RegistryNotFound
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from cubicweb.vregistry import classid
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from cubicweb.cwvreg import CWRegistry, VRegistry
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from cubicweb.selectors import (objectify_selector, lltrace, ExpectedValueSelector,
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                                is_instance)
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from cubicweb.appobject import AppObject
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from cubicweb.server.session import security_enabled
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ENTITIES_HOOKS = set(('before_add_entity',    'after_add_entity',
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                      'before_update_entity', 'after_update_entity',
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                      'before_delete_entity', 'after_delete_entity'))
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RELATIONS_HOOKS = set(('before_add_relation',   'after_add_relation' ,
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                       'before_delete_relation','after_delete_relation'))
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SYSTEM_HOOKS = set(('server_backup', 'server_restore',
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                    'server_startup', 'server_maintenance', 'server_shutdown',
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                    'session_open', 'session_close'))
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ALL_HOOKS = ENTITIES_HOOKS | RELATIONS_HOOKS | SYSTEM_HOOKS
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def _iter_kwargs(entities, kwargs):
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    if not entities:
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        yield kwargs
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    else:
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        for entity in entities:
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            kwargs['entity'] = entity
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            yield kwargs
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class HooksRegistry(CWRegistry):
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    def initialization_completed(self):
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        for appobjects in self.values():
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            for cls in appobjects:
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                if not cls.enabled:
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                    warn('[3.6] %s: enabled is deprecated' % classid(cls))
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                    self.unregister(cls)
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    def register(self, obj, **kwargs):
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        obj.check_events()
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        super(HooksRegistry, self).register(obj, **kwargs)
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    def call_hooks(self, event, session=None, **kwargs):
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        """call `event` hooks for an entity or a list of entities (passed
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        respectively as the `entity` or ``entities`` keyword argument).
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        """
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        kwargs['event'] = event
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        if session is None: # True for events such as server_start
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            for hook in sorted(self.possible_objects(session, **kwargs),
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                               key=lambda x: x.order):
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                hook()
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        else:
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            if 'entities' in kwargs:
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                assert 'entity' not in kwargs, \
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                       'can\'t pass "entities" and "entity" arguments simultaneously'
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                entities = kwargs.pop('entities')
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            else:
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                entities = []
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            # by default, hooks are executed with security turned off
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            with security_enabled(session, read=False):
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                for _kwargs in _iter_kwargs(entities, kwargs):
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                    hooks = sorted(self.possible_objects(session, **_kwargs),
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                                   key=lambda x: x.order)
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                    with security_enabled(session, write=False):
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                        for hook in hooks:
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                            #print hook.category, hook.__regid__
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                            hook()
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class HooksManager(object):
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    def __init__(self, vreg):
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        self.vreg = vreg
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    def call_hooks(self, event, session=None, **kwargs):
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        try:
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            registry = self.vreg['%s_hooks' % event]
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        except RegistryNotFound:
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            return # no hooks for this event
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   333
        registry.call_hooks(event, session, **kwargs)
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   335
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for event in ALL_HOOKS:
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    VRegistry.REGISTRY_FACTORY['%s_hooks' % event] = HooksRegistry
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@deprecated('[3.10] use entity.cw_edited.oldnewvalue(attr)')
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   340
def entity_oldnewvalue(entity, attr):
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   341
    return entity.cw_edited.oldnewvalue(attr)
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   342
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   343
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# some hook specific selectors #################################################
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@objectify_selector
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@lltrace
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def enabled_category(cls, req, **kwargs):
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   349
    if req is None:
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   350
        return True # XXX how to deactivate server startup / shutdown event
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   351
    return req.is_hook_activated(cls)
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@objectify_selector
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@lltrace
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   355
def from_dbapi_query(cls, req, **kwargs):
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   356
    if req.running_dbapi_query:
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   357
        return 1
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   358
    return 0
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   359
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   360
class rechain(object):
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diff changeset
   361
    def __init__(self, *iterators):
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diff changeset
   362
        self.iterators = iterators
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diff changeset
   363
    def __iter__(self):
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diff changeset
   364
        return iter(chain(*self.iterators))
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diff changeset
   365
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diff changeset
   366
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8757fca2c308 [hooks] match_rtype and match_rtype_sets don't need to extend match_search_state
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   367
class match_rtype(ExpectedValueSelector):
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   368
    """accept if parameters specified as initializer arguments are specified
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   369
    in named arguments given to the selector
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   370
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   371
    :param *expected: parameters (eg `basestring`) which are expected to be
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   372
                      found in named arguments (kwargs)
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   373
    """
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diff changeset
   374
    def __init__(self, *expected, **more):
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diff changeset
   375
        self.expected = expected
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diff changeset
   376
        self.frometypes = more.pop('frometypes', None)
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   377
        self.toetypes = more.pop('toetypes', None)
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   378
        assert not more, "unexpected kwargs in match_rtype: %s" % more
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diff changeset
   379
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diff changeset
   380
    @lltrace
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diff changeset
   381
    def __call__(self, cls, req, *args, **kwargs):
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diff changeset
   382
        if kwargs.get('rtype') not in self.expected:
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diff changeset
   383
            return 0
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diff changeset
   384
        if self.frometypes is not None and \
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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diff changeset
   385
               req.describe(kwargs['eidfrom'])[0] not in self.frometypes:
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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diff changeset
   386
            return 0
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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diff changeset
   387
        if self.toetypes is not None and \
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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parents: 4339
diff changeset
   388
               req.describe(kwargs['eidto'])[0] not in self.toetypes:
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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parents: 4339
diff changeset
   389
            return 0
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
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parents: 4339
diff changeset
   390
        return 1
2d2aa2526c56 match_rtype hook selector now accepts frometypes/toetypes optional arguments to match only given subject/object entity types
Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   391
2835
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diff changeset
   392
4699
8757fca2c308 [hooks] match_rtype and match_rtype_sets don't need to extend match_search_state
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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diff changeset
   393
class match_rtype_sets(ExpectedValueSelector):
6834
b4befa12bbcc [doc] fix match_rtype_sets docstring
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parents: 6831
diff changeset
   394
    """accept if the relation type is in one of the sets given as initializer
b4befa12bbcc [doc] fix match_rtype_sets docstring
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diff changeset
   395
    argument. The goal of this selector is that it keeps reference to original sets,
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   396
    so modification to thoses sets are considered by the selector. For instance
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   397
b4befa12bbcc [doc] fix match_rtype_sets docstring
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diff changeset
   398
    MYSET = set()
b4befa12bbcc [doc] fix match_rtype_sets docstring
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parents: 6831
diff changeset
   399
b4befa12bbcc [doc] fix match_rtype_sets docstring
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diff changeset
   400
    class Hook1(Hook):
b4befa12bbcc [doc] fix match_rtype_sets docstring
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parents: 6831
diff changeset
   401
        __regid__ = 'hook1'
b4befa12bbcc [doc] fix match_rtype_sets docstring
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parents: 6831
diff changeset
   402
        __select__ = Hook.__select__ & match_rtype_sets(MYSET)
b4befa12bbcc [doc] fix match_rtype_sets docstring
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parents: 6831
diff changeset
   403
        ...
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   404
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   405
    class Hook2(Hook):
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   406
        __regid__ = 'hook2'
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   407
        __select__ = Hook.__select__ & match_rtype_sets(MYSET)
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   408
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   409
    Client code can now change `MYSET`, this will changes the selection criteria
b4befa12bbcc [doc] fix match_rtype_sets docstring
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6831
diff changeset
   410
    of :class:`Hook1` and :class:`Hook1`.
4086
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   411
    """
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   412
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   413
    def __init__(self, *expected):
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   414
        self.expected = expected
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   415
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   416
    @lltrace
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   417
    def __call__(self, cls, req, *args, **kwargs):
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   418
        for rel_set in self.expected:
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   419
            if kwargs.get('rtype') in rel_set:
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   420
                return 1
9b96126e0b14 add hook selector
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents: 4075
diff changeset
   421
        return 0
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   422
5093
8d073d2e089d [optimization] improve massive write performance by optimizing hooks selection
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5072
diff changeset
   423
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   424
# base class for hook ##########################################################
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   425
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   426
class Hook(AppObject):
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   427
    """Base class for hook.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   428
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   429
    Hooks being appobjects like views, they have a `__regid__` and a `__select__`
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   430
    class attribute. Like all appobjects, hooks have the `self._cw` attribute which
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   431
    represents the current session. In entity hooks, a `self.entity` attribute is
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   432
    also present.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   433
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   434
    The `events` tuple is used by the base class selector to dispatch the hook
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   435
    on the right events. It is possible to dispatch on multiple events at once
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   436
    if needed (though take care as hook attribute may vary as described above).
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   437
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   438
    .. Note::
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   439
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   440
      Do not forget to extend the base class selectors as in:
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   441
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   442
      .. sourcecode:: python
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   443
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   444
          class MyHook(Hook):
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   445
            __regid__ = 'whatever'
6366
1806148d6ce8 backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6279 6345
diff changeset
   446
            __select__ = Hook.__select__ & is_instance('Person')
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   447
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   448
      else your hooks will be called madly, whatever the event.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   449
    """
5093
8d073d2e089d [optimization] improve massive write performance by optimizing hooks selection
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5072
diff changeset
   450
    __select__ = enabled_category()
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   451
    # set this in derivated classes
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   452
    events = None
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   453
    category = None
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   454
    order = 0
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   455
    # XXX deprecated
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   456
    enabled = True
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   457
5287
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   458
    @classmethod
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   459
    def check_events(cls):
5116
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   460
        try:
5287
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   461
            for event in cls.events:
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   462
                if event not in ALL_HOOKS:
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   463
                    raise Exception('bad event %s on %s.%s' % (
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   464
                        event, cls.__module__, cls.__name__))
5116
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   465
        except AttributeError:
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   466
            raise
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   467
        except TypeError:
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   468
            raise Exception('bad .events attribute %s on %s.%s' % (
a2ce436e00ad [hooks] better message on bad .event class attribute
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5093
diff changeset
   469
                cls.events, cls.__module__, cls.__name__))
5093
8d073d2e089d [optimization] improve massive write performance by optimizing hooks selection
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5072
diff changeset
   470
8d073d2e089d [optimization] improve massive write performance by optimizing hooks selection
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5072
diff changeset
   471
    @classproperty
5287
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   472
    def __registries__(cls):
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   473
        cls.check_events()
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   474
        return ['%s_hooks' % ev for ev in cls.events]
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   475
6346f1fd0a50 [hook] backport bad .events fix from default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5220
diff changeset
   476
    @classproperty
3376
f5c69485381f [appobjects] use __regid__ instead of __id__, more explicit
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3195
diff changeset
   477
    def __regid__(cls):
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   478
        warn('[3.6] %s: please specify an id for your hook' % classid(cls),
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   479
             DeprecationWarning)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   480
        return str(id(cls))
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   481
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   482
    @classmethod
4490
d45cde54d464 backport stable branch and some vreg cleanups:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4341
diff changeset
   483
    def __registered__(cls, reg):
d45cde54d464 backport stable branch and some vreg cleanups:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4341
diff changeset
   484
        super(Hook, cls).__registered__(reg)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   485
        if getattr(cls, 'accepts', None):
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   486
            warn('[3.6] %s: accepts is deprecated, define proper __select__'
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   487
                 % classid(cls), DeprecationWarning)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   488
            rtypes = []
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   489
            for ertype in cls.accepts:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   490
                if ertype.islower():
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   491
                    rtypes.append(ertype)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   492
                else:
5877
0c7b7b76a84f [selectors] provide a new, optimized, is_instance selector that should at some point replace implements (along with the adaptable selector)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5848
diff changeset
   493
                    cls.__select__ = cls.__select__ & is_instance(ertype)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   494
            if rtypes:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   495
                cls.__select__ = cls.__select__ & match_rtype(*rtypes)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   496
        return cls
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   497
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   498
    known_args = set(('entity', 'rtype', 'eidfrom', 'eidto', 'repo', 'timestamp'))
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   499
    def __init__(self, req, event, **kwargs):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   500
        for arg in self.known_args:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   501
            if arg in kwargs:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   502
                setattr(self, arg, kwargs.pop(arg))
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   503
        super(Hook, self).__init__(req, **kwargs)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   504
        self.event = event
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   505
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   506
    def __call__(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   507
        if hasattr(self, 'call'):
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   508
            warn('[3.6] %s: call is deprecated, implement __call__'
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   509
                 % classid(self.__class__), DeprecationWarning)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   510
            if self.event.endswith('_relation'):
2847
c2ee28f4d4b1 use ._cw instead of .cw_req
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2840
diff changeset
   511
                self.call(self._cw, self.eidfrom, self.rtype, self.eidto)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   512
            elif 'delete' in self.event:
2847
c2ee28f4d4b1 use ._cw instead of .cw_req
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2840
diff changeset
   513
                self.call(self._cw, self.entity.eid)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   514
            elif self.event.startswith('server_'):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   515
                self.call(self.repo)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   516
            elif self.event.startswith('session_'):
2847
c2ee28f4d4b1 use ._cw instead of .cw_req
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2840
diff changeset
   517
                self.call(self._cw)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   518
            else:
2847
c2ee28f4d4b1 use ._cw instead of .cw_req
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2840
diff changeset
   519
                self.call(self._cw, self.entity)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   520
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   521
set_log_methods(Hook, getLogger('cubicweb.hook'))
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   522
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   523
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   524
# abtract hooks for relation propagation #######################################
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   525
# See example usage in hooks of the nosylist cube
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   526
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   527
class PropagateRelationHook(Hook):
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   528
    """propagate some `main_rtype` relation on entities linked as object of
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   529
    `subject_relations` or as subject of `object_relations` (the watched
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   530
    relations).
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   531
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   532
    This hook ensure that when one of the watched relation is added, the
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   533
    `main_rtype` relation is added to the target entity of the relation.
6345
1a7f4bfbf92b [doc] add note about propagation on deletion of a watched relation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6263
diff changeset
   534
    Notice there are no default behaviour defined when a watched relation is
1a7f4bfbf92b [doc] add note about propagation on deletion of a watched relation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6263
diff changeset
   535
    deleted, you'll have to handle this by yourself.
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   536
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   537
    You usually want to use the :class:`match_rtype_sets` selector on concret
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   538
    classes.
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   539
    """
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   540
    events = ('after_add_relation',)
3660
7b41a6ba7400 fix/prepare propagation hooks usage
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3659
diff changeset
   541
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   542
    # to set in concrete class
3660
7b41a6ba7400 fix/prepare propagation hooks usage
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3659
diff changeset
   543
    main_rtype = None
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   544
    subject_relations = None
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   545
    object_relations = None
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   546
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   547
    def __call__(self):
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   548
        assert self.main_rtype
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   549
        for eid in (self.eidfrom, self.eidto):
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   550
            etype = self._cw.describe(eid)[0]
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   551
            if self.main_rtype not in self._cw.vreg.schema.eschema(etype).subjrels:
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   552
                return
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   553
        if self.rtype in self.subject_relations:
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   554
            meid, seid = self.eidfrom, self.eidto
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   555
        else:
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   556
            assert self.rtype in self.object_relations
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   557
            meid, seid = self.eidto, self.eidfrom
4835
13b0b96d7982 [repo] enhanced security handling: deprecates unsafe_execute, in favor of explicit read/write security control using the `enabled_security` context manager. Also code executed on the repository side is now unsafe by default.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4834
diff changeset
   558
        self._cw.execute(
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   559
            'SET E %s P WHERE X %s P, X eid %%(x)s, E eid %%(e)s, NOT E %s P'
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   560
            % (self.main_rtype, self.main_rtype, self.main_rtype),
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   561
            {'x': meid, 'e': seid})
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   562
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   563
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   564
class PropagateRelationAddHook(Hook):
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   565
    """Propagate to entities at the end of watched relations when a `main_rtype`
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   566
    relation is added.
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   567
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   568
    `subject_relations` and `object_relations` attributes should be specified on
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   569
    subclasses and are usually shared references with attributes of the same
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   570
    name on :class:`PropagateRelationHook`.
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   571
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   572
    Because of those shared references, you can use `skip_subject_relations` and
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   573
    `skip_object_relations` attributes when you don't want to propagate to
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   574
    entities linked through some particular relations.
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   575
    """
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   576
    events = ('after_add_relation',)
3660
7b41a6ba7400 fix/prepare propagation hooks usage
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3659
diff changeset
   577
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   578
    # to set in concrete class (mandatory)
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   579
    subject_relations = None
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   580
    object_relations = None
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   581
    # to set in concrete class (optionaly)
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   582
    skip_subject_relations = ()
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   583
    skip_object_relations = ()
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   584
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   585
    def __call__(self):
4104
7e478d7caf20 [mq]: small_api_changes_for_3.6
Arthur Lutz <arthur.lutz@logilab.fr>
parents: 4086
diff changeset
   586
        eschema = self._cw.vreg.schema.eschema(self._cw.describe(self.eidfrom)[0])
4835
13b0b96d7982 [repo] enhanced security handling: deprecates unsafe_execute, in favor of explicit read/write security control using the `enabled_security` context manager. Also code executed on the repository side is now unsafe by default.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4834
diff changeset
   587
        execute = self._cw.execute
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   588
        for rel in self.subject_relations:
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   589
            if rel in eschema.subjrels and not rel in self.skip_subject_relations:
3090
8184bec7414d backport 3.5
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3087
diff changeset
   590
                execute('SET R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   591
                        'X %s R, NOT R %s P' % (self.rtype, rel, self.rtype),
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   592
                        {'x': self.eidfrom, 'p': self.eidto})
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   593
        for rel in self.object_relations:
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   594
            if rel in eschema.objrels and not rel in self.skip_object_relations:
3090
8184bec7414d backport 3.5
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3087
diff changeset
   595
                execute('SET R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   596
                        'R %s X, NOT R %s P' % (self.rtype, rel, self.rtype),
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   597
                        {'x': self.eidfrom, 'p': self.eidto})
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   598
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   599
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   600
class PropagateRelationDelHook(PropagateRelationAddHook):
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   601
    """Propagate to entities at the end of watched relations when a `main_rtype`
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   602
    relation is deleted.
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   603
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   604
    This is the opposite of the :class:`PropagateRelationAddHook`, see its
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   605
    documentation for how to use this class.
4522
271f201e3735 propagation hooks cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4490
diff changeset
   606
    """
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   607
    events = ('after_delete_relation',)
3660
7b41a6ba7400 fix/prepare propagation hooks usage
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3659
diff changeset
   608
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   609
    def __call__(self):
4104
7e478d7caf20 [mq]: small_api_changes_for_3.6
Arthur Lutz <arthur.lutz@logilab.fr>
parents: 4086
diff changeset
   610
        eschema = self._cw.vreg.schema.eschema(self._cw.describe(self.eidfrom)[0])
4835
13b0b96d7982 [repo] enhanced security handling: deprecates unsafe_execute, in favor of explicit read/write security control using the `enabled_security` context manager. Also code executed on the repository side is now unsafe by default.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4834
diff changeset
   611
        execute = self._cw.execute
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   612
        for rel in self.subject_relations:
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   613
            if rel in eschema.subjrels and not rel in self.skip_subject_relations:
3090
8184bec7414d backport 3.5
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3087
diff changeset
   614
                execute('DELETE R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   615
                        'X %s R' % (self.rtype, rel),
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   616
                        {'x': self.eidfrom, 'p': self.eidto})
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   617
        for rel in self.object_relations:
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   618
            if rel in eschema.objrels and not rel in self.skip_object_relations:
3090
8184bec7414d backport 3.5
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3087
diff changeset
   619
                execute('DELETE R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3423
diff changeset
   620
                        'R %s X' % (self.rtype, rel),
5509
205e708dd5db [3.8 execute] remove deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   621
                        {'x': self.eidfrom, 'p': self.eidto})
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   622
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   623
6263
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   624
PropagateSubjectRelationHook = class_renamed(
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   625
    'PropagateSubjectRelationHook', PropagateRelationHook,
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   626
    '[3.9] PropagateSubjectRelationHook has been renamed to PropagateRelationHook')
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   627
PropagateSubjectRelationAddHook = class_renamed(
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   628
    'PropagateSubjectRelationAddHook', PropagateRelationAddHook,
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   629
    '[3.9] PropagateSubjectRelationAddHook has been renamed to PropagateRelationAddHook')
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   630
PropagateSubjectRelationDelHook = class_renamed(
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   631
    'PropagateSubjectRelationDelHook', PropagateRelationDelHook,
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   632
    '[3.9] PropagateSubjectRelationDelHook has been renamed to PropagateRelationDelHook')
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   633
e91ac6e95116 [propagation hooks] support to skip some relation when propagating to linked entities. Proper renaming and enhance documentation on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   634
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   635
# abstract classes for operation ###############################################
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   636
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   637
class Operation(object):
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   638
    """Base class for operations.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   639
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   640
    Operation may be instantiated in the hooks' `__call__` method. It always
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   641
    takes a session object as first argument (accessible as `.session` from the
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   642
    operation instance), and optionally all keyword arguments needed by the
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   643
    operation. These keyword arguments will be accessible as attributes from the
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   644
    operation instance.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   645
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   646
    An operation is triggered on connections pool events related to
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   647
    commit / rollback transations. Possible events are:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   648
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   649
    * `precommit`:
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   650
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   651
      the transaction is being prepared for commit. You can freely do any heavy
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   652
      computation, raise an exception if the commit can't go. or even add some
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   653
      new operations during this phase. If you do anything which has to be
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   654
      reverted if the commit fails afterwards (eg altering the file system for
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   655
      instance), you'll have to support the 'revertprecommit' event to revert
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   656
      things by yourself
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   657
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   658
    * `revertprecommit`:
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   659
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   660
      if an operation failed while being pre-commited, this event is triggered
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   661
      for all operations which had their 'precommit' event already fired to let
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   662
      them revert things (including the operation which made the commit fail)
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   663
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   664
    * `rollback`:
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   665
5220
42f854b6083d [doc/book] complete chapter on hooks & ops
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 5194
diff changeset
   666
      the transaction has been either rollbacked either:
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   667
5220
42f854b6083d [doc/book] complete chapter on hooks & ops
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 5194
diff changeset
   668
       * intentionaly
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   669
       * a 'precommit' event failed, in which case all operations are rollbacked
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   670
         once 'revertprecommit'' has been called
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   671
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   672
    * `postcommit`:
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   673
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   674
      the transaction is over. All the ORM entities accessed by the earlier
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   675
      transaction are invalid. If you need to work on the database, you need to
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   676
      start a new transaction, for instance using a new internal session, which
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   677
      you will need to commit (and close!).
5837
67c722b36f7c updated docstrings on Operation class
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 5744
diff changeset
   678
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   679
    For an operation to support an event, one has to implement the `<event
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   680
    name>_event` method with no arguments.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   681
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   682
    The order of operations may be important, and is controlled according to
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   683
    the insert_index's method output (whose implementation vary according to the
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   684
    base hook class used).
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   685
    """
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   686
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   687
    def __init__(self, session, **kwargs):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   688
        self.session = session
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   689
        self.__dict__.update(kwargs)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   690
        self.register(session)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   691
        # execution information
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   692
        self.processed = None # 'precommit', 'commit'
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   693
        self.failed = False
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   694
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   695
    def register(self, session):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   696
        session.add_operation(self, self.insert_index())
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   697
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   698
    def insert_index(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   699
        """return the index of  the lastest instance which is not a
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   700
        LateOperation instance
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   701
        """
3720
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   702
        # faster by inspecting operation in reverse order for heavy transactions
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   703
        i = None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   704
        for i, op in enumerate(reversed(self.session.pending_operations)):
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   705
            if isinstance(op, (LateOperation, SingleLastOperation)):
3720
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   706
                continue
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   707
            return -i or None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   708
        if i is None:
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   709
            return None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   710
        return -(i + 1)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   711
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   712
    def handle_event(self, event):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   713
        """delegate event handling to the opertaion"""
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   714
        if event == 'postcommit_event' and hasattr(self, 'commit_event'):
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   715
            warn('[3.10] %s: commit_event method has been replaced by postcommit_event'
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   716
                 % classid(self.__class__), DeprecationWarning)
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   717
            self.commit_event()
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   718
        getattr(self, event)()
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   719
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   720
    def precommit_event(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   721
        """the observed connections pool is preparing a commit"""
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   722
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   723
    def revertprecommit_event(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   724
        """an error went when pre-commiting this operation or a later one
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   725
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   726
        should revert pre-commit's changes but take care, they may have not
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   727
        been all considered if it's this operation which failed
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   728
        """
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   729
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   730
    def rollback_event(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   731
        """the observed connections pool has been rollbacked
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   732
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   733
        do nothing by default, the operation will just be removed from the pool
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   734
        operation list
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   735
        """
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   736
3998
94cc7cad3d2d backport stable into default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3720
diff changeset
   737
    def postcommit_event(self):
94cc7cad3d2d backport stable into default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3720
diff changeset
   738
        """the observed connections pool has committed"""
94cc7cad3d2d backport stable into default
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3720
diff changeset
   739
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   740
    @property
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   741
    @deprecated('[3.6] use self.session.user')
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   742
    def user(self):
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   743
        return self.session.user
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   744
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   745
    @property
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   746
    @deprecated('[3.6] use self.session.repo')
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   747
    def repo(self):
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   748
        return self.session.repo
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   749
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   750
    @property
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   751
    @deprecated('[3.6] use self.session.vreg.schema')
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   752
    def schema(self):
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   753
        return self.session.repo.schema
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   754
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   755
    @property
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   756
    @deprecated('[3.6] use self.session.vreg.config')
2855
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   757
    def config(self):
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   758
        return self.session.repo.config
1d9be3dffa94 [repo] more deprecation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2847
diff changeset
   759
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   760
set_log_methods(Operation, getLogger('cubicweb.session'))
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   761
5538
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   762
def _container_add(container, value):
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   763
    {set: set.add, list: list.append}[container.__class__](container, value)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   764
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   765
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   766
class DataOperationMixIn(object):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   767
    """Mix-in class to ease applying a single operation on a set of data,
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   768
    avoiding to create as many as operation as they are individual modification.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   769
    The body of the operation must then iterate over the values that have been
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   770
    stored in a single operation instance.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   771
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   772
    You should try to use this instead of creating on operation for each
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   773
    `value`, since handling operations becomes costly on massive data import.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   774
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   775
    Usage looks like:
6753
2bbc1010494c [doc/book] fix/update a bit the hooks chapter
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 6730
diff changeset
   776
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   777
    .. sourcecode:: python
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   778
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   779
        class MyEntityHook(Hook):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   780
            __regid__ = 'my.entity.hook'
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   781
            __select__ = Hook.__select__ & is_instance('MyEntity')
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   782
            events = ('after_add_entity',)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   783
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   784
            def __call__(self):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   785
                MyOperation.get_instance(self._cw).add_data(self.entity)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   786
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   787
6730
253dd28cc35f [hook] update DataOperationMixIn docstring
Julien Jehannet <julien.jehannet@logilab.fr>
parents: 6426
diff changeset
   788
        class MyOperation(DataOperationMixIn, Operation):
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   789
            def precommit_event(self):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   790
                for bucket in self.get_data():
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   791
                    process(bucket)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   792
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   793
    You can modify the `containercls` class attribute, which defines the
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   794
    container class that should be instantiated to hold payloads. An instance is
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   795
    created on instantiation, and then the :meth:`add_data` method will add the
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   796
    given data to the existing container. Default to a `set`. Give `list` if you
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   797
    want to keep arrival ordering. You can also use another kind of container
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   798
    by redefining :meth:`_build_container` and :meth:`add_data`
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   799
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   800
    More optional parameters can be given to the `get_instance` operation, that
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   801
    will be given to the operation constructer (though those parameters should
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   802
    not vary accross different calls to this method for a same operation for
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   803
    obvious reason).
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   804
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   805
    .. Note::
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   806
        For sanity reason `get_data` will reset the operation, so that once
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   807
        the operation has started its treatment, if some hook want to push
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   808
        additional data to this same operation, a new instance will be created
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   809
        (else that data has a great chance to be never treated). This implies:
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   810
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   811
        * you should **always** call `get_data` when starting treatment
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   812
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   813
        * you should **never** call `get_data` for another reason.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   814
    """
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   815
    containercls = set
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   816
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   817
    @classproperty
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   818
    def data_key(cls):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   819
        return ('cw.dataops', cls.__name__)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   820
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   821
    @classmethod
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   822
    def get_instance(cls, session, **kwargs):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   823
        # no need to lock: transaction_data already comes from thread's local storage
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   824
        try:
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   825
            return session.transaction_data[cls.data_key]
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   826
        except KeyError:
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   827
            op = session.transaction_data[cls.data_key] = cls(session, **kwargs)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   828
            return op
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   829
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   830
    def __init__(self, *args, **kwargs):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   831
        super(DataOperationMixIn, self).__init__(*args, **kwargs)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   832
        self._container = self._build_container()
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   833
        self._processed = False
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   834
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   835
    def __contains__(self, value):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   836
        return value in self._container
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   837
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   838
    def _build_container(self):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   839
        return self.containercls()
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   840
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   841
    def add_data(self, data):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   842
        assert not self._processed, """Trying to add data to a closed operation.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   843
Iterating over operation data closed it and should be reserved to precommit /
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   844
postcommit method of the operation."""
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   845
        _container_add(self._container, data)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   846
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   847
    def get_data(self):
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   848
        assert not self._processed, """Trying to get data from a closed operation.
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   849
Iterating over operation data closed it and should be reserved to precommit /
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   850
postcommit method of the operation."""
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   851
        self._processed = True
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   852
        op = self.session.transaction_data.pop(self.data_key)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   853
        assert op is self, "Bad handling of operation data, found %s instead of %s for key %s" % (
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   854
            op, self, self.data_key)
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   855
        return self._container
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   856
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   857
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   858
@deprecated('[3.10] use opcls.get_instance(session, **opkwargs).add_data(value)')
5538
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   859
def set_operation(session, datakey, value, opcls, containercls=set, **opkwargs):
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   860
    """Function to ease applying a single operation on a set of data, avoiding
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   861
    to create as many as operation as they are individual modification. You
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   862
    should try to use this instead of creating on operation for each `value`,
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   863
    since handling operations becomes coslty on massive data import.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   864
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   865
    Arguments are:
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   866
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   867
    * the `session` object
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   868
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   869
    * `datakey`, a specially forged key that will be used as key in
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   870
      session.transaction_data
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   871
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   872
    * `value` that is the actual payload of an individual operation
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   873
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   874
    * `opcls`, the class of the operation. An instance is created on the first
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   875
      call for the given key, and then subsequent calls will simply add the
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   876
      payload to the container (hence `opkwargs` is only used on that first
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   877
      call)
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   878
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   879
    * `containercls`, the container class that should be instantiated to hold
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   880
      payloads.  An instance is created on the first call for the given key, and
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   881
      then subsequent calls will add the data to the existing container. Default
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   882
      to a set. Give `list` if you want to keep arrival ordering.
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   883
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   884
    * more optional parameters to give to the operation (here the rtype which do not
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   885
      vary accross operations).
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   886
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   887
    The body of the operation must then iterate over the values that have been mapped
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   888
    in the transaction_data dictionary to the forged key, e.g.:
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   889
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   890
    .. sourcecode:: python
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   891
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   892
           for value in self._cw.transaction_data.pop(datakey):
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   893
               ...
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   894
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   895
    .. Note::
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   896
       **poping** the key from `transaction_data` is not an option, else you may
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   897
       get unexpected data loss in some case of nested hooks.
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   898
    """
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   899
    try:
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   900
        # Search for session.transaction_data[`datakey`] (expected to be a set):
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   901
        # if found, simply append `value`
5538
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   902
        _container_add(session.transaction_data[datakey], value)
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   903
    except KeyError:
6147
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   904
        # else, initialize it to containercls([`value`]) and instantiate the given
95c604ec89bf update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6142
diff changeset
   905
        # `opcls` operation class with additional keyword arguments
5194
395f076512a1 [hooks] fix set_operation options passing (** -> *)
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 5191
diff changeset
   906
        opcls(session, **opkwargs)
5538
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   907
        session.transaction_data[datakey] = containercls()
752bc67064f2 [integrity] keep ordering for schema integrity checks
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5509
diff changeset
   908
        _container_add(session.transaction_data[datakey], value)
5060
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   909
ee3b856e1406 [repo] optimize massive insertion/deletion by using the new set_operation function
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5019
diff changeset
   910
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   911
class LateOperation(Operation):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   912
    """special operation which should be called after all possible (ie non late)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   913
    operations
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   914
    """
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   915
    def insert_index(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   916
        """return the index of  the lastest instance which is not a
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   917
        SingleLastOperation instance
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   918
        """
3720
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   919
        # faster by inspecting operation in reverse order for heavy transactions
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   920
        i = None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   921
        for i, op in enumerate(reversed(self.session.pending_operations)):
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   922
            if isinstance(op, SingleLastOperation):
3720
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   923
                continue
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   924
            return -i or None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   925
        if i is None:
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   926
            return None
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   927
        return -(i + 1)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   928
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   929
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   930
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   931
class SingleLastOperation(Operation):
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   932
    """special operation which should be called once and after all other
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   933
    operations
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   934
    """
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   935
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   936
    def register(self, session):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   937
        """override register to handle cases where this operation has already
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   938
        been added
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   939
        """
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   940
        operations = session.pending_operations
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   941
        index = self.equivalent_index(operations)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   942
        if index is not None:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   943
            equivalent = operations.pop(index)
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   944
        else:
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   945
            equivalent = None
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   946
        session.add_operation(self, self.insert_index())
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   947
        return equivalent
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   948
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   949
    def equivalent_index(self, operations):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   950
        """return the index of the equivalent operation if any"""
3720
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   951
        for i, op in enumerate(reversed(operations)):
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   952
            if op.__class__ is self.__class__:
5376aaadd16b backport stable
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3660
diff changeset
   953
                return -(i+1)
2835
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   954
        return None
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   955
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   956
    def insert_index(self):
04034421b072 [hooks] major refactoring:
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   957
        return None
2840
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   958
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   959
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   960
class SendMailOp(SingleLastOperation):
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   961
    def __init__(self, session, msg=None, recipients=None, **kwargs):
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   962
        # may not specify msg yet, as
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   963
        # `cubicweb.sobjects.supervision.SupervisionMailOp`
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   964
        if msg is not None:
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   965
            assert recipients
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   966
            self.to_send = [(msg, recipients)]
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   967
        else:
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   968
            assert recipients is None
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   969
            self.to_send = []
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   970
        super(SendMailOp, self).__init__(session, **kwargs)
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   971
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   972
    def register(self, session):
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   973
        previous = super(SendMailOp, self).register(session)
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   974
        if previous:
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   975
            self.to_send = previous.to_send + self.to_send
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   976
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
   977
    def postcommit_event(self):
3418
7b49fa7e942d [api] use _cw, cw_row, cw_col, cw_rset etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   978
        self.session.repo.threaded_task(self.sendmails)
2840
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   979
06daf13195d4 [hooks] deprecates hookhelper module
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2835
diff changeset
   980
    def sendmails(self):
3418
7b49fa7e942d [api] use _cw, cw_row, cw_col, cw_rset etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   981
        self.session.vreg.config.sendmails(self.to_send)
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   982
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   983
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   984
class RQLPrecommitOperation(Operation):
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   985
    def precommit_event(self):
4835
13b0b96d7982 [repo] enhanced security handling: deprecates unsafe_execute, in favor of explicit read/write security control using the `enabled_security` context manager. Also code executed on the repository side is now unsafe by default.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4834
diff changeset
   986
        execute = self.session.execute
2968
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   987
        for rql in self.rqls:
0e3460341023 somewhat painful backport of 3.5 branch, should mostly be ok
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2855
diff changeset
   988
            execute(*rql)
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   989
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   990
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
   991
class CleanupNewEidsCacheOp(DataOperationMixIn, SingleLastOperation):
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   992
    """on rollback of a insert query we have to remove from repository's
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   993
    type/source cache eids of entities added in that transaction.
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   994
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   995
    NOTE: querier's rqlst/solutions cache may have been polluted too with
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   996
    queries such as Any X WHERE X eid 32 if 32 has been rollbacked however
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   997
    generated queries are unpredictable and analysing all the cache probably
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   998
    too expensive. Notice that there is no pb when using args to specify eids
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
   999
    instead of giving them into the rql string.
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1000
    """
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
  1001
    data_key = 'neweids'
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1002
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1003
    def rollback_event(self):
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1004
        """the observed connections pool has been rollbacked,
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1005
        remove inserted eid from repository type/source cache
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1006
        """
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1007
        try:
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
  1008
            self.session.repo.clear_caches(self.get_data())
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1009
        except KeyError:
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1010
            pass
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1011
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
  1012
class CleanupDeletedEidsCacheOp(DataOperationMixIn, SingleLastOperation):
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1013
    """on commit of delete query, we have to remove from repository's
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1014
    type/source cache eids of entities deleted in that transaction.
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1015
    """
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
  1016
    data_key = 'pendingeids'
6142
8bc6eac1fac1 [session] cleanup hook / operation / entity edition api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5877
diff changeset
  1017
    def postcommit_event(self):
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1018
        """the observed connections pool has been rollbacked,
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1019
        remove inserted eid from repository type/source cache
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1020
        """
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1021
        try:
6426
541659c39f6a [hook/operation] nicer api to achieve same result as set_operation, as described in #1253630
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6366
diff changeset
  1022
            self.session.repo.clear_caches(self.get_data())
5067
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1023
        except KeyError:
adc2122eed03 [repo] more efficient eid cache operations handling based on set_operation; refactor
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5060
diff changeset
  1024
            pass