server/ssplanner.py
author Alexandre Fayolle <alexandre.fayolle@logilab.fr>
Fri, 15 Jan 2010 09:36:49 +0100
branchstable
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a few french translation typo corrections
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"""plan execution of rql queries on a single source
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from copy import copy
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from rql.stmts import Union, Select
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from rql.nodes import Constant
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from cubicweb import QueryError, typed_eid
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from cubicweb.schema import VIRTUAL_RTYPES
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from cubicweb.rqlrewrite import add_types_restriction
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class SSPlanner(object):
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    """SingleSourcePlanner: build execution plan for rql queries
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    optimized for single source repositories
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    """
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    def __init__(self, schema, rqlhelper):
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        self.schema = schema
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        self.rqlhelper = rqlhelper
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    def build_plan(self, plan):
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        """build an execution plan from a RQL query
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        do nothing here, dispatch according to the statement type
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        """
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        build_plan = getattr(self, 'build_%s_plan' % plan.rqlst.TYPE)
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        for step in build_plan(plan, plan.rqlst):
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            plan.add_step(step)
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    def build_select_plan(self, plan, rqlst):
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        """build execution plan for a SELECT RQL query. Suppose only one source
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        is available and so avoid work need for query decomposition among sources
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        the rqlst should not be tagged at this point.
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        """
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        plan.preprocess(rqlst)
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        return (OneFetchStep(plan, rqlst, plan.session.repo.sources),)
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    def build_insert_plan(self, plan, rqlst):
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        """get an execution plan from an INSERT RQL query"""
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        # each variable in main variables is a new entity to insert
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        to_build = {}
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        session = plan.session
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        etype_class = session.vreg['etypes'].etype_class
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        for etype, var in rqlst.main_variables:
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            # need to do this since entity class is shared w. web client code !
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            to_build[var.name] = etype_class(etype)(session)
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            plan.add_entity_def(to_build[var.name])
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        # add constant values to entity def, mark variables to be selected
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        to_select = plan.relation_definitions(rqlst, to_build)
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        # add necessary steps to add relations and update attributes
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        step = InsertStep(plan) # insert each entity and its relations
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        step.children += self._compute_relation_steps(plan, rqlst.solutions,
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                                                      rqlst.where, to_select)
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        return (step,)
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    def _compute_relation_steps(self, plan, solutions, restriction, to_select):
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        """handle the selection of relations for an insert query"""
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        for edef, rdefs in to_select.items():
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            # create a select rql st to fetch needed data
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            select = Select()
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            eschema = edef.e_schema
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            for i in range(len(rdefs)):
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                rtype, term, reverse = rdefs[i]
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                select.append_selected(term.copy(select))
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                if reverse:
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                    rdefs[i] = rtype, RelationsStep.REVERSE_RELATION
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                else:
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                    rschema = eschema.subjrels[rtype]
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                    if rschema.final or rschema.inlined:
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                        rdefs[i] = rtype, RelationsStep.FINAL
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                    else:
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                        rdefs[i] = rtype, RelationsStep.RELATION
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            if restriction is not None:
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                select.set_where(restriction.copy(select))
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            step = RelationsStep(plan, edef, rdefs)
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            step.children += self._select_plan(plan, select, solutions)
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            yield step
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    def build_delete_plan(self, plan, rqlst):
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        """get an execution plan from a DELETE RQL query"""
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        # build a select query to fetch entities to delete
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        steps = []
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        for etype, var in rqlst.main_variables:
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            step = DeleteEntitiesStep(plan)
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            step.children += self._sel_variable_step(plan, rqlst.solutions,
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                                                     rqlst.where, etype, var)
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            steps.append(step)
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        for relation in rqlst.main_relations:
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            step = DeleteRelationsStep(plan, relation.r_type)
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            step.children += self._sel_relation_steps(plan, rqlst.solutions,
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                                                      rqlst.where, relation)
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            steps.append(step)
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        return steps
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    def _sel_variable_step(self, plan, solutions, restriction, etype, varref):
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        """handle the selection of variables for a delete query"""
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        select = Select()
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        varref = varref.copy(select)
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        select.defined_vars = {varref.name: varref.variable}
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        select.append_selected(varref)
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        if restriction is not None:
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            select.set_where(restriction.copy(select))
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        if etype != 'Any':
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            select.add_type_restriction(varref.variable, etype)
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        return self._select_plan(plan, select, solutions)
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    def _sel_relation_steps(self, plan, solutions, restriction, relation):
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        """handle the selection of relations for a delete query"""
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        select = Select()
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        lhs, rhs = relation.get_variable_parts()
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        select.append_selected(lhs.copy(select))
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        select.append_selected(rhs.copy(select))
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        select.set_where(relation.copy(select))
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        if restriction is not None:
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            select.add_restriction(restriction.copy(select))
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        return self._select_plan(plan, select, solutions)
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0
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    def build_set_plan(self, plan, rqlst):
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        """get an execution plan from an SET RQL query"""
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        select = Select()
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        # extract variables to add to the selection
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        selected_index = {}
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        index = 0
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        relations, attrrelations = [], []
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        getrschema = self.schema.rschema
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        for relation in rqlst.main_relations:
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            if relation.r_type in VIRTUAL_RTYPES:
0
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                raise QueryError('can not assign to %r relation'
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                                 % relation.r_type)
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            lhs, rhs = relation.get_variable_parts()
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            if not lhs.as_string('utf-8') in selected_index:
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                select.append_selected(lhs.copy(select))
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                selected_index[lhs.as_string('utf-8')] = index
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                index += 1
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            if not rhs.as_string('utf-8') in selected_index:
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                select.append_selected(rhs.copy(select))
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                selected_index[rhs.as_string('utf-8')] = index
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                index += 1
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            rschema = getrschema(relation.r_type)
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            if rschema.final or rschema.inlined:
0
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                attrrelations.append(relation)
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            else:
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                relations.append(relation)
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        # add step necessary to fetch all selected variables values
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        if rqlst.where is not None:
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            select.set_where(rqlst.where.copy(select))
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        # set distinct to avoid potential duplicate key error
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        select.distinct = True
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        step = UpdateStep(plan, attrrelations, relations, selected_index)
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        step.children += self._select_plan(plan, select, rqlst.solutions)
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        return (step,)
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    # internal methods ########################################################
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0
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    def _select_plan(self, plan, select, solutions):
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        union = Union()
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        union.append(select)
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        select.clean_solutions(solutions)
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        add_types_restriction(self.schema, select)
0
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        self.rqlhelper.annotate(union)
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        return self.build_select_plan(plan, union)
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# execution steps and helper functions ########################################
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def varmap_test_repr(varmap, tablesinorder):
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    if varmap is None:
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        return varmap
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    maprepr = {}
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    for var, sql in varmap.iteritems():
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        table, col = sql.split('.')
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        maprepr[var] = '%s.%s' % (tablesinorder[table], col)
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    return maprepr
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def offset_result(offset, result):
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    offset -= len(result)
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    if offset < 0:
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        result = result[offset:]
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        offset = None
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    elif offset == 0:
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        offset = None
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        result = ()
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    return offset, result
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class LimitOffsetMixIn(object):
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    limit = offset = None
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    def set_limit_offset(self, limit, offset):
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        self.limit = limit
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        self.offset = offset or None
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0
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class Step(object):
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    """base abstract class for execution step"""
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    def __init__(self, plan):
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        self.plan = plan
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        self.children = []
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0
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    def execute_child(self):
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        assert len(self.children) == 1
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        return self.children[0].execute()
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    def execute_children(self):
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        for step in self.children:
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            step.execute()
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    def execute(self):
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        """execute this step and store partial (eg this step) results"""
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        raise NotImplementedError()
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0
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    def mytest_repr(self):
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        """return a representation of this step suitable for test"""
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        return (self.__class__.__name__,)
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0
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    def test_repr(self):
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        """return a representation of this step suitable for test"""
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        return self.mytest_repr() + (
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            [step.test_repr() for step in self.children],)
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class OneFetchStep(LimitOffsetMixIn, Step):
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    """step consisting in fetching data from sources and directly returning
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    results
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    """
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    def __init__(self, plan, union, sources, inputmap=None):
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        Step.__init__(self, plan)
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        self.union = union
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        self.sources = sources
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        self.inputmap = inputmap
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        self.set_limit_offset(union.children[-1].limit, union.children[-1].offset)
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    def set_limit_offset(self, limit, offset):
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        LimitOffsetMixIn.set_limit_offset(self, limit, offset)
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        for select in self.union.children:
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            select.limit = limit
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            select.offset = offset
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    def execute(self):
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        """call .syntax_tree_search with the given syntax tree on each
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        source for each solution
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        """
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        self.execute_children()
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        session = self.plan.session
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        args = self.plan.args
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        inputmap = self.inputmap
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        union = self.union
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        # do we have to use a inputmap from a previous step ? If so disable
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        # cachekey
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        if inputmap or self.plan.cache_key is None:
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            cachekey = None
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        # union may have been splited into subqueries, rebuild a cache key
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        elif isinstance(self.plan.cache_key, tuple):
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            cachekey = list(self.plan.cache_key)
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            cachekey[0] = union.as_string()
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            cachekey = tuple(cachekey)
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        else:
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            cachekey = union.as_string()
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        result = []
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        # limit / offset processing
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        limit = self.limit
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        offset = self.offset
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        if offset is not None:
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            if len(self.sources) > 1:
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                # we'll have to deal with limit/offset by ourself
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                if union.children[-1].limit:
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                    union.children[-1].limit = limit + offset
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                union.children[-1].offset = None
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            else:
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                offset, limit = None, None
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        for source in self.sources:
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            if offset is None and limit is not None:
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                # modifying the sample rqlst is enough since sql generation
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                # will pick it here as well
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                union.children[-1].limit = limit - len(result)
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            result_ = source.syntax_tree_search(session, union, args, cachekey,
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                                                inputmap)
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            if offset is not None:
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                offset, result_ = offset_result(offset, result_)
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            result += result_
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            if limit is not None:
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   291
                if len(result) >= limit:
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   292
                    return result[:limit]
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        #print 'ONEFETCH RESULT %s' % (result)
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        return result
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    def mytest_repr(self):
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        """return a representation of this step suitable for test"""
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        try:
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            inputmap = varmap_test_repr(self.inputmap, self.plan.tablesinorder)
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        except AttributeError:
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            inputmap = self.inputmap
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   302
        return (self.__class__.__name__,
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                sorted((r.as_string(kwargs=self.plan.args), r.solutions)
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                       for r in self.union.children),
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                self.limit, self.offset,
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   306
                sorted(self.sources), inputmap)
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   307
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   308
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   309
# UPDATE/INSERT/DELETE steps ##################################################
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class RelationsStep(Step):
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    """step consisting in adding attributes/relations to entity defs from a
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   313
    previous FetchStep
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   314
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   315
    relations values comes from the latest result, with one columns for
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    each relation defined in self.rdefs
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0
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    for one entity definition, we'll construct N entity, where N is the
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   319
    number of the latest result
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   320
    """
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   321
0
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   322
    FINAL = 0
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   323
    RELATION = 1
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   324
    REVERSE_RELATION = 2
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   325
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   326
    def __init__(self, plan, edef, rdefs):
0
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        Step.__init__(self, plan)
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        # partial entity definition to expand
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        self.edef = edef
0
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        # definition of relations to complete
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   331
        self.rdefs = rdefs
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0
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   333
    def execute(self):
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        """execute this step"""
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   335
        base_edef = self.edef
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   336
        edefs = []
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   337
        result = self.execute_child()
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   338
        for row in result:
0
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   339
            # get a new entity definition for this row
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   340
            edef = copy(base_edef)
0
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   341
            # complete this entity def using row values
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   342
            for i in range(len(self.rdefs)):
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   343
                rtype, rorder = self.rdefs[i]
0
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   344
                if rorder == RelationsStep.FINAL:
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   345
                    edef[rtype] = row[i]
0
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   346
                elif rorder == RelationsStep.RELATION:
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   347
                    self.plan.add_relation_def( (edef, rtype, row[i]) )
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   348
                    edef.querier_pending_relations[(rtype, 'subject')] = row[i]
0
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   349
                else:
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   350
                    self.plan.add_relation_def( (row[i], rtype, edef) )
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   351
                    edef.querier_pending_relations[(rtype, 'object')] = row[i]
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   352
            edefs.append(edef)
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   353
        self.plan.substitute_entity_def(base_edef, edefs)
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   354
        return result
0
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   355
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   356
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   357
class InsertStep(Step):
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    """step consisting in inserting new entities / relations"""
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   359
0
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   360
    def execute(self):
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   361
        """execute this step"""
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   362
        for step in self.children:
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   363
            assert isinstance(step, RelationsStep)
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   364
            step.plan = self.plan
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   365
            step.execute()
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   366
        # insert entities first
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   367
        result = self.plan.insert_entity_defs()
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   368
        # then relation
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   369
        self.plan.insert_relation_defs()
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   370
        # return eids of inserted entities
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   371
        return result
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   372
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   373
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   374
class DeleteEntitiesStep(Step):
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   375
    """step consisting in deleting entities"""
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   376
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   377
    def execute(self):
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   378
        """execute this step"""
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   379
        todelete = frozenset(typed_eid(eid) for eid, in self.execute_child())
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   380
        session = self.plan.session
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   381
        delete = session.repo.glob_delete_entity
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   382
        # register pending eids first to avoid multiple deletion
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diff changeset
   383
        pending = session.transaction_data.setdefault('pendingeids', set())
0
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diff changeset
   384
        actual = todelete - pending
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   385
        pending |= actual
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diff changeset
   386
        for eid in actual:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
            delete(session, eid)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   388
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   389
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
class DeleteRelationsStep(Step):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
    """step consisting in deleting relations"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
    def __init__(self, plan, rtype):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
        Step.__init__(self, plan)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
        self.rtype = rtype
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   396
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
    def execute(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
        """execute this step"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
        session = self.plan.session
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
        delete = session.repo.glob_delete_relation
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
        for subj, obj in self.execute_child():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
            delete(session, subj, self.rtype, obj)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   403
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
class UpdateStep(Step):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
    """step consisting in updating entities / adding relations from relations
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
    definitions and from results fetched in previous step
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
    """
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   409
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
    def __init__(self, plan, attribute_relations, relations, selected_index):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
        Step.__init__(self, plan)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
        self.attribute_relations = attribute_relations
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
        self.relations = relations
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
        self.selected_index = selected_index
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1016
diff changeset
   415
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
    def execute(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
        """execute this step"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
        plan = self.plan
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
        session = self.plan.session
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
        repo = session.repo
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
        edefs = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
        # insert relations
2875
b7399ef8b3e0 towards better edited attributes handling
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2667
diff changeset
   423
        attributes = set([relation.r_type for relation in self.attribute_relations])
2921
8e2544e78a5e test and fix rset returned by SET query
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2875
diff changeset
   424
        result = self.execute_child()
8e2544e78a5e test and fix rset returned by SET query
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2875
diff changeset
   425
        for row in result:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
            for relation in self.attribute_relations:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
                lhs, rhs = relation.get_variable_parts()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
                eid = typed_eid(row[self.selected_index[str(lhs)]])
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
                try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
                    edef = edefs[eid]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
                except KeyError:
2667
c8aa82538d8e [repo] explicitly specifies edited attributes to glob_update_entity
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   432
                    edefs[eid] = edef = session.entity_from_eid(eid)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
                if isinstance(rhs, Constant):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
                    # add constant values to entity def
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
                    value = rhs.eval(plan.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
                    edef[relation.r_type] = value
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
                else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
                    edef[relation.r_type] = row[self.selected_index[str(rhs)]]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
            for relation in self.relations:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
                subj = row[self.selected_index[str(relation.children[0])]]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
                obj = row[self.selected_index[str(relation.children[1])]]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
                repo.glob_add_relation(session, subj, relation.r_type, obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
        # update entities
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
        for eid, edef in edefs.iteritems():
2667
c8aa82538d8e [repo] explicitly specifies edited attributes to glob_update_entity
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   445
            repo.glob_update_entity(session, edef, attributes)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
        return result