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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/ops/parsed_update.h"
#include "mongo/db/matcher/extensions_callback_real.h"
#include "mongo/db/ops/update_request.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/db/query/query_planner_common.h"
#include "mongo/db/server_options.h"
namespace mongo {
ParsedUpdate::ParsedUpdate(OperationContext* opCtx, const UpdateRequest* request)
: _opCtx(opCtx),
_request(request),
_driver(new ExpressionContext(opCtx, nullptr)),
_canonicalQuery() {}
Status ParsedUpdate::parseRequest() {
// It is invalid to request that the UpdateStage return the prior or newly-updated version
// of a document during a multi-update.
invariant(!(_request->shouldReturnAnyDocs() && _request->isMulti()));
// It is invalid to request that a ProjectionStage be applied to the UpdateStage if the
// UpdateStage would not return any document.
invariant(_request->getProj().isEmpty() || _request->shouldReturnAnyDocs());
if (!_request->getCollation().isEmpty()) {
auto collator = CollatorFactoryInterface::get(_opCtx->getServiceContext())
->makeFromBSON(_request->getCollation());
if (!collator.isOK()) {
return collator.getStatus();
}
_collator = std::move(collator.getValue());
}
Status status = parseArrayFilters();
if (!status.isOK()) {
return status;
}
// We parse the update portion before the query portion because the dispostion of the update
// may determine whether or not we need to produce a CanonicalQuery at all. For example, if
// the update involves the positional-dollar operator, we must have a CanonicalQuery even if
// it isn't required for query execution.
parseUpdate();
status = parseQuery();
if (!status.isOK())
return status;
return Status::OK();
}
Status ParsedUpdate::parseQuery() {
dassert(!_canonicalQuery.get());
if (!_driver.needMatchDetails() && CanonicalQuery::isSimpleIdQuery(_request->getQuery())) {
return Status::OK();
}
return parseQueryToCQ();
}
Status ParsedUpdate::parseQueryToCQ() {
dassert(!_canonicalQuery.get());
const ExtensionsCallbackReal extensionsCallback(_opCtx, &_request->getNamespaceString());
// The projection needs to be applied after the update 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 update stage expects to be able to skip documents that were
// deleted/modified under it, but a limit could inhibit that and give an EOF when the update
// has not actually updated a document. This behavior is fine for findAndModify, but should
// not apply to update in general.
if (!_request->isMulti() && !_request->getSort().isEmpty()) {
qr->setLimit(1);
}
// $expr is not allowed in the query for an upsert, since it is not clear what the equality
// extraction behavior for $expr should be.
MatchExpressionParser::AllowedFeatureSet allowedMatcherFeatures =
MatchExpressionParser::kAllowAllSpecialFeatures;
if (_request->isUpsert()) {
allowedMatcherFeatures &= ~MatchExpressionParser::AllowedFeatures::kExpr;
}
boost::intrusive_ptr<ExpressionContext> expCtx;
auto statusWithCQ = CanonicalQuery::canonicalize(
_opCtx, std::move(qr), std::move(expCtx), extensionsCallback, allowedMatcherFeatures);
if (statusWithCQ.isOK()) {
_canonicalQuery = std::move(statusWithCQ.getValue());
}
if (statusWithCQ.getStatus().code() == ErrorCodes::QueryFeatureNotAllowed) {
// The default error message for disallowed $expr is not descriptive enough, so we rewrite
// it here.
return {ErrorCodes::QueryFeatureNotAllowed,
"$expr is not allowed in the query predicate for an upsert"};
}
return statusWithCQ.getStatus();
}
void ParsedUpdate::parseUpdate() {
_driver.setCollator(_collator.get());
_driver.setLogOp(true);
_driver.setFromOplogApplication(_request->isFromOplogApplication());
_driver.parse(_request->getUpdates(), _arrayFilters, _request->isMulti());
}
Status ParsedUpdate::parseArrayFilters() {
for (auto rawArrayFilter : _request->getArrayFilters()) {
boost::intrusive_ptr<ExpressionContext> expCtx(
new ExpressionContext(_opCtx, _collator.get()));
auto parsedArrayFilter =
MatchExpressionParser::parse(rawArrayFilter,
std::move(expCtx),
ExtensionsCallbackNoop(),
MatchExpressionParser::kBanAllSpecialFeatures);
if (!parsedArrayFilter.isOK()) {
return parsedArrayFilter.getStatus().withContext("Error parsing array filter");
}
auto parsedArrayFilterWithPlaceholder =
ExpressionWithPlaceholder::make(std::move(parsedArrayFilter.getValue()));
if (!parsedArrayFilterWithPlaceholder.isOK()) {
return parsedArrayFilterWithPlaceholder.getStatus().withContext(
"Error parsing array filter");
}
auto finalArrayFilter = std::move(parsedArrayFilterWithPlaceholder.getValue());
auto fieldName = finalArrayFilter->getPlaceholder();
if (!fieldName) {
return Status(
ErrorCodes::FailedToParse,
"Cannot use an expression without a top-level field name in arrayFilters");
}
if (_arrayFilters.find(*fieldName) != _arrayFilters.end()) {
return Status(ErrorCodes::FailedToParse,
str::stream()
<< "Found multiple array filters with the same top-level field name "
<< *fieldName);
}
_arrayFilters[*fieldName] = std::move(finalArrayFilter);
}
return Status::OK();
}
PlanExecutor::YieldPolicy ParsedUpdate::yieldPolicy() const {
return _request->isGod() ? PlanExecutor::NO_YIELD : _request->getYieldPolicy();
}
bool ParsedUpdate::hasParsedQuery() const {
return _canonicalQuery.get() != NULL;
}
std::unique_ptr<CanonicalQuery> ParsedUpdate::releaseParsedQuery() {
invariant(_canonicalQuery.get() != NULL);
return std::move(_canonicalQuery);
}
const UpdateRequest* ParsedUpdate::getRequest() const {
return _request;
}
UpdateDriver* ParsedUpdate::getDriver() {
return &_driver;
}
void ParsedUpdate::setCollator(std::unique_ptr<CollatorInterface> collator) {
_collator = std::move(collator);
_driver.setCollator(_collator.get());
for (auto&& arrayFilter : _arrayFilters) {
arrayFilter.second->getFilter()->setCollator(_collator.get());
}
}
} // namespace mongo
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