server/sources/storages.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Thu, 08 Apr 2010 17:50:37 +0200
branchstable
changeset 5189 84d4587a92bc
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child 5218 aebd00a2d316
permissions -rw-r--r--
[doc/book] rql/dbapi cleanup, rip cachekey (prematurely ?)
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"""custom storages for the system source"""
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from os import unlink, path as osp
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from cubicweb import Binary
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from cubicweb.server.hook import Operation
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def set_attribute_storage(repo, etype, attr, storage):
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    repo.system_source.set_storage(etype, attr, storage)
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def unset_attribute_storage(repo, etype, attr):
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    repo.system_source.unset_storage(etype, attr)
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class Storage(object):
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    """abstract storage
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    * If `source_callback` is true (by default), the callback will be run during
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      query result process of fetched attribute's valu and should have the
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      following prototype::
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        callback(self, source, value)
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      where `value` is the value actually stored in the backend. None values
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      will be skipped (eg callback won't be called).
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    * if `source_callback` is false, the callback will be run during sql
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      generation when some attribute with a custom storage is accessed and
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      should have the following prototype::
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        callback(self, generator, relation, linkedvar)
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      where `generator` is the sql generator, `relation` the current rql syntax
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      tree relation and linkedvar the principal syntax tree variable holding the
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      attribute.
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    """
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    is_source_callback = True
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    def callback(self, *args):
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        """see docstring for prototype, which vary according to is_source_callback
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        """
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        raise NotImplementedError()
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    def entity_added(self, entity, attr):
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        """an entity using this storage for attr has been added"""
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        raise NotImplementedError()
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    def entity_updated(self, entity, attr):
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        """an entity using this storage for attr has been updatded"""
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        raise NotImplementedError()
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    def entity_deleted(self, entity, attr):
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        """an entity using this storage for attr has been deleted"""
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        raise NotImplementedError()
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# TODO
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# * make it configurable without code
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# * better file path attribution
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# * handle backup/restore
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class BytesFileSystemStorage(Storage):
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    """store Bytes attribute value on the file system"""
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    def __init__(self, defaultdir):
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        self.default_directory = defaultdir
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    def callback(self, source, value):
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        """sql generator callback when some attribute with a custom storage is
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        accessed
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        """
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        fpath = source.binary_to_str(value)
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        try:
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            return Binary(file(fpath).read())
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        except OSError, ex:
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            source.critical("can't open %s: %s", value, ex)
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            return None
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    def entity_added(self, entity, attr):
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        """an entity using this storage for attr has been added"""
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        if entity._cw.transaction_data.get('fs_importing'):
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            binary = Binary(file(entity[attr].getvalue()).read())
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        else:
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            binary = entity.pop(attr)
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            fpath = self.new_fs_path(entity, attr)
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            # bytes storage used to store file's path
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            entity[attr] = Binary(fpath)
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            file(fpath, 'w').write(binary.getvalue())
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            AddFileOp(entity._cw, filepath=fpath)
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        return binary
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    def entity_updated(self, entity, attr):
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        """an entity using this storage for attr has been updatded"""
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        if entity._cw.transaction_data.get('fs_importing'):
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            oldpath = self.current_fs_path(entity, attr)
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            fpath = entity[attr].getvalue()
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            if oldpath != fpath:
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                DeleteFileOp(entity._cw, filepath=oldpath)
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            binary = Binary(file(fpath).read())
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        else:
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            binary = entity.pop(attr)
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            fpath = self.current_fs_path(entity, attr)
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            UpdateFileOp(entity._cw, filepath=fpath, filedata=binary.getvalue())
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        return binary
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    def entity_deleted(self, entity, attr):
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        """an entity using this storage for attr has been deleted"""
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        DeleteFileOp(entity._cw, filepath=self.current_fs_path(entity, attr))
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    def new_fs_path(self, entity, attr):
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        fspath = osp.join(self.default_directory, '%s_%s' % (entity.eid, attr))
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        while osp.exists(fspath):
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            fspath = '_' + fspath
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        return fspath
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    def current_fs_path(self, entity, attr):
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        sysource = entity._cw.pool.source('system')
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        cu = sysource.doexec(entity._cw,
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                             'SELECT cw_%s FROM cw_%s WHERE cw_eid=%s' % (
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                                 attr, entity.__regid__, entity.eid))
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        rawvalue = cu.fetchone()[0]
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        if rawvalue is None: # no previous value
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            return self.new_fs_path(entity, attr)
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        return sysource._process_value(rawvalue, cu.description[0],
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                                       binarywrap=str)
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class AddFileOp(Operation):
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    def rollback_event(self):
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        try:
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            unlink(self.filepath)
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        except:
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            pass
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class DeleteFileOp(Operation):
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    def commit_event(self):
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        try:
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            unlink(self.filepath)
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        except:
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            pass
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class UpdateFileOp(Operation):
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    def precommit_event(self):
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        try:
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            file(self.filepath, 'w').write(self.filedata)
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        except Exception, ex:
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            self.exception(str(ex))