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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/exec/shard_filter.h"
#include "mongo/db/exec/filter.h"
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/s/shard_key_pattern.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/log.h"
namespace mongo {
using std::shared_ptr;
using std::unique_ptr;
using std::vector;
using stdx::make_unique;
// static
const char* ShardFilterStage::kStageType = "SHARDING_FILTER";
ShardFilterStage::ShardFilterStage(OperationContext* opCtx,
ScopedCollectionMetadata metadata,
WorkingSet* ws,
PlanStage* child)
: PlanStage(kStageType, opCtx), _ws(ws), _metadata(std::move(metadata)) {
_children.emplace_back(child);
}
ShardFilterStage::~ShardFilterStage() {}
bool ShardFilterStage::isEOF() {
return child()->isEOF();
}
PlanStage::StageState ShardFilterStage::doWork(WorkingSetID* out) {
// If we've returned as many results as we're limited to, isEOF will be true.
if (isEOF()) {
return PlanStage::IS_EOF;
}
StageState status = child()->work(out);
if (PlanStage::ADVANCED == status) {
// If we're sharded make sure that we don't return data that is not owned by us,
// including pending documents from in-progress migrations and orphaned documents from
// aborted migrations
if (_metadata->isSharded()) {
ShardKeyPattern shardKeyPattern(_metadata->getKeyPattern());
WorkingSetMember* member = _ws->get(*out);
WorkingSetMatchableDocument matchable(member);
BSONObj shardKey = shardKeyPattern.extractShardKeyFromMatchable(matchable);
if (shardKey.isEmpty()) {
// We can't find a shard key for this document - this should never happen with
// a non-fetched result unless our query planning is screwed up
if (!member->hasObj()) {
Status status(ErrorCodes::InternalError,
"shard key not found after a covered stage, "
"query planning has failed");
// Fail loudly and cleanly in production, fatally in debug
error() << redact(status);
dassert(false);
_ws->free(*out);
*out = WorkingSetCommon::allocateStatusMember(_ws, status);
return PlanStage::FAILURE;
}
// Skip this document with a warning - no shard key should not be possible
// unless manually inserting data into a shard
warning() << "no shard key found in document " << redact(member->obj.value()) << " "
<< "for shard key pattern " << _metadata->getKeyPattern() << ", "
<< "document may have been inserted manually into shard";
}
if (!_metadata->keyBelongsToMe(shardKey)) {
_ws->free(*out);
++_specificStats.chunkSkips;
return PlanStage::NEED_TIME;
}
}
// If we're here either we have shard state and our doc passed, or we have no shard
// state. Either way, we advance.
return status;
}
return status;
}
unique_ptr<PlanStageStats> ShardFilterStage::getStats() {
_commonStats.isEOF = isEOF();
unique_ptr<PlanStageStats> ret =
make_unique<PlanStageStats>(_commonStats, STAGE_SHARDING_FILTER);
ret->children.emplace_back(child()->getStats());
ret->specific = make_unique<ShardingFilterStats>(_specificStats);
return ret;
}
const SpecificStats* ShardFilterStage::getSpecificStats() const {
return &_specificStats;
}
} // namespace mongo
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