author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Thu, 10 Sep 2009 12:23:16 +0200 | |
branch | stable |
changeset 3164 | b025592ff478 |
parent 2875 | b7399ef8b3e0 |
child 2921 | 8e2544e78a5e |
permissions | -rw-r--r-- |
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"""plan execution of rql queries on a single source |
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:organization: Logilab |
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
1977
606923dff11b
big bunch of copyright / docstring update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1802
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6 |
: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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def add_types_restriction(schema, rqlst, newroot=None, solutions=None): |
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if newroot is None: |
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assert solutions is None |
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if hasattr(rqlst, '_types_restr_added'): |
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return |
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solutions = rqlst.solutions |
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newroot = rqlst |
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rqlst._types_restr_added = True |
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else: |
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assert solutions is not None |
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rqlst = rqlst.stmt |
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eschema = schema.eschema |
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allpossibletypes = {} |
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for solution in solutions: |
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for varname, etype in solution.iteritems(): |
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if not varname in newroot.defined_vars or eschema(etype).is_final(): |
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continue |
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allpossibletypes.setdefault(varname, set()).add(etype) |
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for varname in sorted(allpossibletypes): |
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try: |
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var = newroot.defined_vars[varname] |
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except KeyError: |
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continue |
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stinfo = var.stinfo |
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42 |
if stinfo.get('uidrels'): |
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continue # eid specified, no need for additional type specification |
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try: |
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typerels = rqlst.defined_vars[varname].stinfo.get('typerels') |
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except KeyError: |
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assert varname in rqlst.aliases |
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continue |
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if newroot is rqlst and typerels: |
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mytyperel = iter(typerels).next() |
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else: |
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for vref in newroot.defined_vars[varname].references(): |
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rel = vref.relation() |
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if rel and rel.is_types_restriction(): |
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mytyperel = rel |
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break |
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else: |
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mytyperel = None |
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possibletypes = allpossibletypes[varname] |
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if mytyperel is not None: |
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# variable as already some types restriction. new possible types |
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# can only be a subset of existing ones, so only remove no more |
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# possible types |
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for cst in mytyperel.get_nodes(Constant): |
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if not cst.value in possibletypes: |
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cst.parent.remove(cst) |
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try: |
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stinfo['possibletypes'].remove(cst.value) |
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except KeyError: |
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# restriction on a type not used by this query, may |
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# occurs with X is IN(...) |
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pass |
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else: |
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# we have to add types restriction |
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if stinfo.get('scope') is not None: |
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rel = var.scope.add_type_restriction(var, possibletypes) |
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else: |
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# tree is not annotated yet, no scope set so add the restriction |
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# to the root |
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rel = newroot.add_type_restriction(var, possibletypes) |
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stinfo['typerels'] = frozenset((rel,)) |
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stinfo['possibletypes'] = possibletypes |
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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. |
108 |
""" |
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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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132 |
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.subject_relation(rtype) |
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if rschema.is_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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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: |
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raise QueryError('can not assign to %r relation' |
203 |
% 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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209 |
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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214 |
if rschema.is_final() or rschema.inlined: |
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attrrelations.append(relation) |
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216 |
else: |
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217 |
relations.append(relation) |
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218 |
# add step necessary to fetch all selected variables values |
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219 |
if rqlst.where is not None: |
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220 |
select.set_where(rqlst.where.copy(select)) |
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# set distinct to avoid potential duplicate key error |
|
222 |
select.distinct = True |
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223 |
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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226 |
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227 |
# internal methods ######################################################## |
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def _select_plan(self, plan, select, solutions): |
230 |
union = Union() |
|
231 |
union.append(select) |
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232 |
select.clean_solutions(solutions) |
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add_types_restriction(self.schema, select) |
0 | 234 |
self.rqlhelper.annotate(union) |
235 |
return self.build_select_plan(plan, union) |
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236 |
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237 |
||
238 |
# execution steps and helper functions ######################################## |
|
239 |
||
240 |
def varmap_test_repr(varmap, tablesinorder): |
|
241 |
if varmap is None: |
|
242 |
return varmap |
|
243 |
maprepr = {} |
|
244 |
for var, sql in varmap.iteritems(): |
|
245 |
table, col = sql.split('.') |
|
246 |
maprepr[var] = '%s.%s' % (tablesinorder[table], col) |
|
247 |
return maprepr |
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248 |
||
249 |
def offset_result(offset, result): |
|
250 |
offset -= len(result) |
|
251 |
if offset < 0: |
|
252 |
result = result[offset:] |
|
253 |
offset = None |
|
254 |
elif offset == 0: |
|
255 |
offset = None |
|
256 |
result = () |
|
257 |
return offset, result |
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258 |
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259 |
||
260 |
class LimitOffsetMixIn(object): |
|
261 |
limit = offset = None |
|
262 |
def set_limit_offset(self, limit, offset): |
|
263 |
self.limit = limit |
|
264 |
self.offset = offset or None |
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265 |
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0 | 267 |
class Step(object): |
268 |
"""base abstract class for execution step""" |
|
269 |
def __init__(self, plan): |
|
270 |
self.plan = plan |
|
271 |
self.children = [] |
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0 | 273 |
def execute_child(self): |
274 |
assert len(self.children) == 1 |
|
275 |
return self.children[0].execute() |
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0 | 277 |
def execute_children(self): |
278 |
for step in self.children: |
|
279 |
step.execute() |
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0 | 281 |
def execute(self): |
282 |
"""execute this step and store partial (eg this step) results""" |
|
283 |
raise NotImplementedError() |
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0 | 285 |
def mytest_repr(self): |
286 |
"""return a representation of this step suitable for test""" |
|
287 |
return (self.__class__.__name__,) |
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0 | 289 |
def test_repr(self): |
290 |
"""return a representation of this step suitable for test""" |
|
291 |
return self.mytest_repr() + ( |
|
292 |
[step.test_repr() for step in self.children],) |
|
293 |
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0 | 295 |
class OneFetchStep(LimitOffsetMixIn, Step): |
296 |
"""step consisting in fetching data from sources and directly returning |
|
297 |
results |
|
298 |
""" |
|
299 |
def __init__(self, plan, union, sources, inputmap=None): |
|
300 |
Step.__init__(self, plan) |
|
301 |
self.union = union |
|
302 |
self.sources = sources |
|
303 |
self.inputmap = inputmap |
|
304 |
self.set_limit_offset(union.children[-1].limit, union.children[-1].offset) |
|
305 |
||
306 |
def set_limit_offset(self, limit, offset): |
|
307 |
LimitOffsetMixIn.set_limit_offset(self, limit, offset) |
|
308 |
for select in self.union.children: |
|
309 |
select.limit = limit |
|
310 |
select.offset = offset |
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0 | 312 |
def execute(self): |
313 |
"""call .syntax_tree_search with the given syntax tree on each |
|
314 |
source for each solution |
|
315 |
""" |
|
316 |
self.execute_children() |
|
317 |
session = self.plan.session |
|
318 |
args = self.plan.args |
|
319 |
inputmap = self.inputmap |
|
320 |
union = self.union |
|
321 |
# do we have to use a inputmap from a previous step ? If so disable |
|
322 |
# cachekey |
|
323 |
if inputmap or self.plan.cache_key is None: |
|
324 |
cachekey = None |
|
325 |
# union may have been splited into subqueries, rebuild a cache key |
|
326 |
elif isinstance(self.plan.cache_key, tuple): |
|
327 |
cachekey = list(self.plan.cache_key) |
|
328 |
cachekey[0] = union.as_string() |
|
329 |
cachekey = tuple(cachekey) |
|
330 |
else: |
|
331 |
cachekey = union.as_string() |
|
332 |
result = [] |
|
333 |
# limit / offset processing |
|
334 |
limit = self.limit |
|
335 |
offset = self.offset |
|
336 |
if offset is not None: |
|
337 |
if len(self.sources) > 1: |
|
338 |
# we'll have to deal with limit/offset by ourself |
|
339 |
if union.children[-1].limit: |
|
340 |
union.children[-1].limit = limit + offset |
|
341 |
union.children[-1].offset = None |
|
342 |
else: |
|
343 |
offset, limit = None, None |
|
344 |
for source in self.sources: |
|
345 |
if offset is None and limit is not None: |
|
346 |
# modifying the sample rqlst is enough since sql generation |
|
347 |
# will pick it here as well |
|
348 |
union.children[-1].limit = limit - len(result) |
|
349 |
result_ = source.syntax_tree_search(session, union, args, cachekey, |
|
350 |
inputmap) |
|
351 |
if offset is not None: |
|
352 |
offset, result_ = offset_result(offset, result_) |
|
353 |
result += result_ |
|
354 |
if limit is not None: |
|
355 |
if len(result) >= limit: |
|
356 |
return result[:limit] |
|
357 |
#print 'ONEFETCH RESULT %s' % (result) |
|
358 |
return result |
|
359 |
||
360 |
def mytest_repr(self): |
|
361 |
"""return a representation of this step suitable for test""" |
|
362 |
try: |
|
363 |
inputmap = varmap_test_repr(self.inputmap, self.plan.tablesinorder) |
|
364 |
except AttributeError: |
|
365 |
inputmap = self.inputmap |
|
366 |
return (self.__class__.__name__, |
|
367 |
sorted((r.as_string(kwargs=self.plan.args), r.solutions) |
|
368 |
for r in self.union.children), |
|
369 |
self.limit, self.offset, |
|
370 |
sorted(self.sources), inputmap) |
|
371 |
||
372 |
||
373 |
# UPDATE/INSERT/DELETE steps ################################################## |
|
374 |
||
375 |
class RelationsStep(Step): |
|
376 |
"""step consisting in adding attributes/relations to entity defs from a |
|
377 |
previous FetchStep |
|
378 |
||
379 |
relations values comes from the latest result, with one columns for |
|
380 |
each relation defined in self.r_defs |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
381 |
|
0 | 382 |
for one entity definition, we'll construct N entity, where N is the |
383 |
number of the latest result |
|
384 |
""" |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
385 |
|
0 | 386 |
FINAL = 0 |
387 |
RELATION = 1 |
|
388 |
REVERSE_RELATION = 2 |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
389 |
|
0 | 390 |
def __init__(self, plan, e_def, r_defs): |
391 |
Step.__init__(self, plan) |
|
392 |
# partial entity definition to expand |
|
393 |
self.e_def = e_def |
|
394 |
# definition of relations to complete |
|
395 |
self.r_defs = r_defs |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
396 |
|
0 | 397 |
def execute(self): |
398 |
"""execute this step""" |
|
399 |
base_e_def = self.e_def |
|
400 |
result = [] |
|
401 |
for row in self.execute_child(): |
|
402 |
# get a new entity definition for this row |
|
403 |
e_def = copy(base_e_def) |
|
404 |
# complete this entity def using row values |
|
405 |
for i in range(len(self.r_defs)): |
|
406 |
rtype, rorder = self.r_defs[i] |
|
407 |
if rorder == RelationsStep.FINAL: |
|
408 |
e_def[rtype] = row[i] |
|
409 |
elif rorder == RelationsStep.RELATION: |
|
410 |
self.plan.add_relation_def( (e_def, rtype, row[i]) ) |
|
411 |
e_def.querier_pending_relations[(rtype, 'subject')] = row[i] |
|
412 |
else: |
|
413 |
self.plan.add_relation_def( (row[i], rtype, e_def) ) |
|
414 |
e_def.querier_pending_relations[(rtype, 'object')] = row[i] |
|
415 |
result.append(e_def) |
|
416 |
self.plan.substitute_entity_def(base_e_def, result) |
|
417 |
||
418 |
||
419 |
class InsertStep(Step): |
|
420 |
"""step consisting in inserting new entities / relations""" |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
421 |
|
0 | 422 |
def execute(self): |
423 |
"""execute this step""" |
|
424 |
for step in self.children: |
|
425 |
assert isinstance(step, RelationsStep) |
|
426 |
step.plan = self.plan |
|
427 |
step.execute() |
|
428 |
# insert entities first |
|
429 |
result = self.plan.insert_entity_defs() |
|
430 |
# then relation |
|
431 |
self.plan.insert_relation_defs() |
|
432 |
# return eids of inserted entities |
|
433 |
return result |
|
434 |
||
435 |
||
436 |
class DeleteEntitiesStep(Step): |
|
437 |
"""step consisting in deleting entities""" |
|
438 |
||
439 |
def execute(self): |
|
440 |
"""execute this step""" |
|
441 |
todelete = frozenset(typed_eid(eid) for eid, in self.execute_child()) |
|
442 |
session = self.plan.session |
|
443 |
delete = session.repo.glob_delete_entity |
|
444 |
# register pending eids first to avoid multiple deletion |
|
2101
08003e0354a7
update transaction data api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
1977
diff
changeset
|
445 |
pending = session.transaction_data.setdefault('pendingeids', set()) |
0 | 446 |
actual = todelete - pending |
447 |
pending |= actual |
|
448 |
for eid in actual: |
|
449 |
delete(session, eid) |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
450 |
|
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
451 |
|
0 | 452 |
class DeleteRelationsStep(Step): |
453 |
"""step consisting in deleting relations""" |
|
454 |
||
455 |
def __init__(self, plan, rtype): |
|
456 |
Step.__init__(self, plan) |
|
457 |
self.rtype = rtype |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
458 |
|
0 | 459 |
def execute(self): |
460 |
"""execute this step""" |
|
461 |
session = self.plan.session |
|
462 |
delete = session.repo.glob_delete_relation |
|
463 |
for subj, obj in self.execute_child(): |
|
464 |
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
|
465 |
|
0 | 466 |
|
467 |
class UpdateStep(Step): |
|
468 |
"""step consisting in updating entities / adding relations from relations |
|
469 |
definitions and from results fetched in previous step |
|
470 |
""" |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
471 |
|
0 | 472 |
def __init__(self, plan, attribute_relations, relations, selected_index): |
473 |
Step.__init__(self, plan) |
|
474 |
self.attribute_relations = attribute_relations |
|
475 |
self.relations = relations |
|
476 |
self.selected_index = selected_index |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1016
diff
changeset
|
477 |
|
0 | 478 |
def execute(self): |
479 |
"""execute this step""" |
|
480 |
plan = self.plan |
|
481 |
session = self.plan.session |
|
482 |
repo = session.repo |
|
483 |
edefs = {} |
|
484 |
# insert relations |
|
2875
b7399ef8b3e0
towards better edited attributes handling
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
2667
diff
changeset
|
485 |
attributes = set([relation.r_type for relation in self.attribute_relations]) |
0 | 486 |
for row in self.execute_child(): |
487 |
for relation in self.attribute_relations: |
|
488 |
lhs, rhs = relation.get_variable_parts() |
|
489 |
eid = typed_eid(row[self.selected_index[str(lhs)]]) |
|
490 |
try: |
|
491 |
edef = edefs[eid] |
|
492 |
except KeyError: |
|
2667
c8aa82538d8e
[repo] explicitly specifies edited attributes to glob_update_entity
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
2650
diff
changeset
|
493 |
edefs[eid] = edef = session.entity_from_eid(eid) |
0 | 494 |
if isinstance(rhs, Constant): |
495 |
# add constant values to entity def |
|
496 |
value = rhs.eval(plan.args) |
|
497 |
edef[relation.r_type] = value |
|
498 |
else: |
|
499 |
edef[relation.r_type] = row[self.selected_index[str(rhs)]] |
|
500 |
for relation in self.relations: |
|
501 |
subj = row[self.selected_index[str(relation.children[0])]] |
|
502 |
obj = row[self.selected_index[str(relation.children[1])]] |
|
503 |
repo.glob_add_relation(session, subj, relation.r_type, obj) |
|
504 |
# update entities |
|
505 |
result = [] |
|
506 |
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
|
507 |
repo.glob_update_entity(session, edef, attributes) |
0 | 508 |
result.append( (eid,) ) |
509 |
return result |