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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kWrite
#include "mongo/platform/basic.h"
#include "mongo/db/ops/parsed_delete.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/exec/delete.h"
#include "mongo/db/matcher/extensions_callback_real.h"
#include "mongo/db/ops/delete_request.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/get_executor.h"
#include "mongo/db/query/query_planner_common.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
ParsedDelete::ParsedDelete(OperationContext* opCtx, const DeleteRequest* request)
: _opCtx(opCtx), _request(request) {}
Status ParsedDelete::parseRequest() {
dassert(!_canonicalQuery.get());
// It is invalid to request that the DeleteStage return the deleted document during a
// multi-remove.
invariant(!(_request->shouldReturnDeleted() && _request->isMulti()));
// It is invalid to request that a ProjectionStage be applied to the DeleteStage if the
// DeleteStage would not return the deleted document.
invariant(_request->getProj().isEmpty() || _request->shouldReturnDeleted());
if (CanonicalQuery::isSimpleIdQuery(_request->getQuery())) {
return Status::OK();
}
return parseQueryToCQ();
}
Status ParsedDelete::parseQueryToCQ() {
dassert(!_canonicalQuery.get());
const ExtensionsCallbackReal extensionsCallback(_opCtx, &_request->getNamespaceString());
// The projection needs to be applied after the delete operation, so we do not specify a
// projection during canonicalization.
auto qr = stdx::make_unique<QueryRequest>(_request->getNamespaceString());
qr->setFilter(_request->getQuery());
qr->setSort(_request->getSort());
qr->setCollation(_request->getCollation());
qr->setExplain(_request->isExplain());
// Limit should only used for the findAndModify command when a sort is specified. If a sort
// is requested, we want to use a top-k sort for efficiency reasons, so should pass the
// limit through. Generally, a delete stage expects to be able to skip documents that were
// deleted out from under it, but a limit could inhibit that and give an EOF when the delete
// has not actually deleted a document. This behavior is fine for findAndModify, but should
// not apply to deletes in general.
if (!_request->isMulti() && !_request->getSort().isEmpty()) {
qr->setLimit(1);
}
const boost::intrusive_ptr<ExpressionContext> expCtx;
auto statusWithCQ =
CanonicalQuery::canonicalize(_opCtx,
std::move(qr),
expCtx,
extensionsCallback,
MatchExpressionParser::kAllowAllSpecialFeatures);
if (statusWithCQ.isOK()) {
_canonicalQuery = std::move(statusWithCQ.getValue());
}
return statusWithCQ.getStatus();
}
const DeleteRequest* ParsedDelete::getRequest() const {
return _request;
}
PlanExecutor::YieldPolicy ParsedDelete::yieldPolicy() const {
if (_request->isGod()) {
return PlanExecutor::NO_YIELD;
}
if (_request->getYieldPolicy() == PlanExecutor::YIELD_AUTO && isIsolated()) {
return PlanExecutor::WRITE_CONFLICT_RETRY_ONLY; // Don't yield locks.
}
return _request->getYieldPolicy();
}
bool ParsedDelete::isIsolated() const {
return _canonicalQuery.get() ? _canonicalQuery->isIsolated()
: QueryRequest::isQueryIsolated(_request->getQuery());
}
bool ParsedDelete::hasParsedQuery() const {
return _canonicalQuery.get() != NULL;
}
std::unique_ptr<CanonicalQuery> ParsedDelete::releaseParsedQuery() {
invariant(_canonicalQuery.get() != NULL);
return std::move(_canonicalQuery);
}
} // namespace mongo
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