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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/pipeline/process_interface_shardsvr.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/shard_filterer_impl.h"
#include "mongo/db/ops/write_ops_exec.h"
#include "mongo/db/ops/write_ops_gen.h"
#include "mongo/db/pipeline/document_source_internal_shard_filter.h"
#include "mongo/db/pipeline/sharded_agg_helpers.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/document_source_merge_cursors.h"
#include "mongo/s/write_ops/cluster_write.h"
#include "mongo/util/log.h"
namespace mongo {
using boost::intrusive_ptr;
using std::shared_ptr;
using std::string;
using std::unique_ptr;
using write_ops::Insert;
using write_ops::Update;
using write_ops::UpdateOpEntry;
namespace {
// Attaches the write concern to the given batch request. If it looks like 'writeConcern' has
// been default initialized to {w: 0, wtimeout: 0} then we do not bother attaching it.
void attachWriteConcern(BatchedCommandRequest* request, const WriteConcernOptions& writeConcern) {
if (!writeConcern.wMode.empty() || writeConcern.wNumNodes > 0) {
request->setWriteConcern(writeConcern.toBSON());
}
}
} // namespace
void MongoInterfaceShardServer::checkRoutingInfoEpochOrThrow(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss,
ChunkVersion targetCollectionVersion) const {
auto catalogCache = Grid::get(expCtx->opCtx)->catalogCache();
return catalogCache->checkEpochOrThrow(nss, targetCollectionVersion);
}
std::pair<std::vector<FieldPath>, bool>
MongoInterfaceShardServer::collectDocumentKeyFieldsForHostedCollection(OperationContext* opCtx,
const NamespaceString& nss,
UUID uuid) const {
invariant(serverGlobalParams.clusterRole == ClusterRole::ShardServer);
const auto metadata = [opCtx, &nss]() -> ScopedCollectionMetadata {
Lock::DBLock dbLock(opCtx, nss.db(), MODE_IS);
Lock::CollectionLock collLock(opCtx, nss, MODE_IS);
return CollectionShardingState::get(opCtx, nss)->getCurrentMetadata();
}();
if (!metadata->isSharded() || !metadata->uuidMatches(uuid)) {
// An unsharded collection can still become sharded so is not final. If the uuid doesn't
// match the one stored in the ScopedCollectionMetadata, this implies that the collection
// has been dropped and recreated as sharded. We don't know what the old document key fields
// might have been in this case so we return just _id.
return {{"_id"}, false};
}
// Unpack the shard key. Collection is now sharded so the document key fields will never change,
// mark as final.
return {_shardKeyToDocumentKeyFields(metadata->getKeyPatternFields()), true};
}
Status MongoInterfaceShardServer::insert(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
std::vector<BSONObj>&& objs,
const WriteConcernOptions& wc,
boost::optional<OID> targetEpoch) {
BatchedCommandResponse response;
BatchWriteExecStats stats;
BatchedCommandRequest insertCommand(
buildInsertOp(ns, std::move(objs), expCtx->bypassDocumentValidation));
// If applicable, attach a write concern to the batched command request.
attachWriteConcern(&insertCommand, wc);
ClusterWriter::write(expCtx->opCtx, insertCommand, &stats, &response, targetEpoch);
return response.toStatus();
}
StatusWith<MongoProcessInterface::UpdateResult> MongoInterfaceShardServer::update(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
BatchedObjects&& batch,
const WriteConcernOptions& wc,
UpsertType upsert,
bool multi,
boost::optional<OID> targetEpoch) {
BatchedCommandResponse response;
BatchWriteExecStats stats;
BatchedCommandRequest updateCommand(buildUpdateOp(expCtx, ns, std::move(batch), upsert, multi));
// If applicable, attach a write concern to the batched command request.
attachWriteConcern(&updateCommand, wc);
ClusterWriter::write(expCtx->opCtx, updateCommand, &stats, &response, targetEpoch);
if (auto status = response.toStatus(); status != Status::OK()) {
return status;
}
return {{response.getN(), response.getNModified()}};
}
unique_ptr<Pipeline, PipelineDeleter> MongoInterfaceShardServer::attachCursorSourceToPipeline(
const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* ownedPipeline) {
std::unique_ptr<Pipeline, PipelineDeleter> pipeline(ownedPipeline,
PipelineDeleter(expCtx->opCtx));
invariant(pipeline->getSources().empty() ||
!dynamic_cast<DocumentSourceMergeCursors*>(pipeline->getSources().front().get()));
// $lookup on a sharded collection is not allowed in a transaction. We assume that if we're in
// a transaction, the foreign collection is unsharded. Otherwise, we may access the catalog
// cache, and attempt to do a network request while holding locks.
// TODO: SERVER-39162 allow $lookup in sharded transactions.
const bool inTxn = expCtx->opCtx->inMultiDocumentTransaction();
const bool isSharded = [&]() {
if (inTxn || !ShardingState::get(expCtx->opCtx)->enabled()) {
// Sharding isn't enabled or we're in a transaction. In either case we assume it's
// unsharded.
return false;
} else if (expCtx->ns.db() == "local") {
// This may be a change stream examining the oplog. We know the oplog (or any local
// collections for that matter) will never be sharded.
return false;
}
return uassertStatusOK(getCollectionRoutingInfoForTxnCmd(expCtx->opCtx, expCtx->ns)).cm() !=
nullptr;
}();
if (isSharded) {
const bool foreignShardedAllowed =
getTestCommandsEnabled() && internalQueryAllowShardedLookup.load();
if (foreignShardedAllowed) {
// For a sharded collection we may have to establish cursors on a remote host.
return sharded_agg_helpers::targetShardsAndAddMergeCursors(expCtx, pipeline.release());
}
uasserted(51069, "Cannot run $lookup with sharded foreign collection");
}
// Perform a "local read", the same as if we weren't a shard server.
// TODO SERVER-39015 we should do a shard version check here after we acquire a lock within
// this function, to be sure the collection didn't become sharded between the time we checked
// whether it's sharded and the time we took the lock.
return attachCursorSourceToPipelineForLocalRead(expCtx, pipeline.release());
}
std::unique_ptr<ShardFilterer> MongoInterfaceShardServer::getShardFilterer(
const boost::intrusive_ptr<ExpressionContext>& expCtx) const {
auto shardingMetadata =
CollectionShardingState::get(expCtx->opCtx, expCtx->ns)->getOrphansFilter(expCtx->opCtx);
return std::make_unique<ShardFiltererImpl>(std::move(shardingMetadata));
}
} // namespace mongo
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