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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::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/service_entry_point_mongod.h"
#include "mongo/db/commands/fsync_locked.h"
#include "mongo/db/concurrency/global_lock_acquisition_tracker.h"
#include "mongo/db/curop.h"
#include "mongo/db/read_concern.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/speculative_majority_read_info.h"
#include "mongo/db/s/implicit_create_collection.h"
#include "mongo/db/s/scoped_operation_completion_sharding_actions.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/db/s/sharding_config_optime_gossip.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/service_entry_point_common.h"
#include "mongo/logger/redaction.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/s/cannot_implicitly_create_collection_info.h"
#include "mongo/s/grid.h"
#include "mongo/s/stale_exception.h"
#include "mongo/util/log.h"
namespace mongo {
constexpr auto kLastCommittedOpTimeFieldName = "lastCommittedOpTime"_sd;
class ServiceEntryPointMongod::Hooks final : public ServiceEntryPointCommon::Hooks {
public:
bool lockedForWriting() const override {
return mongo::lockedForWriting();
}
void waitForReadConcern(OperationContext* opCtx,
const CommandInvocation* invocation,
const OpMsgRequest& request) const override {
Status rcStatus = mongo::waitForReadConcern(
opCtx, repl::ReadConcernArgs::get(opCtx), invocation->allowsAfterClusterTime());
if (!rcStatus.isOK()) {
if (ErrorCodes::isExceededTimeLimitError(rcStatus.code())) {
const int debugLevel =
serverGlobalParams.clusterRole == ClusterRole::ConfigServer ? 0 : 2;
LOG(debugLevel) << "Command on database " << request.getDatabase()
<< " timed out waiting for read concern to be satisfied. Command: "
<< redact(ServiceEntryPointCommon::getRedactedCopyForLogging(
invocation->definition(), request.body));
}
uassertStatusOK(rcStatus);
}
}
void waitForSpeculativeMajorityReadConcern(OperationContext* opCtx) const override {
auto speculativeReadInfo = repl::SpeculativeMajorityReadInfo::get(opCtx);
if (!speculativeReadInfo.isSpeculativeRead()) {
return;
}
uassertStatusOK(mongo::waitForSpeculativeMajorityReadConcern(opCtx, speculativeReadInfo));
}
void waitForWriteConcern(OperationContext* opCtx,
const CommandInvocation* invocation,
const repl::OpTime& lastOpBeforeRun,
BSONObjBuilder& commandResponseBuilder) const override {
auto lastOpAfterRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
// Ensures that if we tried to do a write, we wait for write concern, even if that write was
// a noop.
if ((lastOpAfterRun == lastOpBeforeRun) &&
GlobalLockAcquisitionTracker::get(opCtx).getGlobalWriteLocked()) {
repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
lastOpAfterRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
}
WriteConcernResult res;
auto waitForWCStatus =
mongo::waitForWriteConcern(opCtx, lastOpAfterRun, opCtx->getWriteConcern(), &res);
CommandHelpers::appendCommandWCStatus(commandResponseBuilder, waitForWCStatus, res);
}
void waitForLinearizableReadConcern(OperationContext* opCtx) const override {
// When a linearizable read command is passed in, check to make sure we're reading
// from the primary.
if (repl::ReadConcernArgs::get(opCtx).getLevel() ==
repl::ReadConcernLevel::kLinearizableReadConcern) {
uassertStatusOK(mongo::waitForLinearizableReadConcern(opCtx));
}
}
void uassertCommandDoesNotSpecifyWriteConcern(const BSONObj& cmd) const override {
if (commandSpecifiesWriteConcern(cmd)) {
uasserted(ErrorCodes::InvalidOptions, "Command does not support writeConcern");
}
}
void attachCurOpErrInfo(OperationContext* opCtx, const BSONObj& replyObj) const override {
CurOp::get(opCtx)->debug().errInfo = getStatusFromCommandResult(replyObj);
}
void handleException(const DBException& e, OperationContext* opCtx) const override {
// If we got a stale config, wait in case the operation is stuck in a critical section
if (auto sce = e.extraInfo<StaleConfigInfo>()) {
if (!opCtx->getClient()->isInDirectClient()) {
// We already have the StaleConfig exception, so just swallow any errors due to
// refresh
onShardVersionMismatchNoExcept(opCtx, sce->getNss(), sce->getVersionReceived())
.ignore();
}
} else if (auto sce = e.extraInfo<StaleDbRoutingVersion>()) {
if (!opCtx->getClient()->isInDirectClient()) {
onDbVersionMismatchNoExcept(
opCtx, sce->getDb(), sce->getVersionReceived(), sce->getVersionWanted())
.ignore();
}
} else if (auto cannotImplicitCreateCollInfo =
e.extraInfo<CannotImplicitlyCreateCollectionInfo>()) {
if (ShardingState::get(opCtx)->enabled()) {
onCannotImplicitlyCreateCollection(opCtx, cannotImplicitCreateCollInfo->getNss())
.ignore();
}
}
}
// Called from the error contexts where request may not be available.
void appendReplyMetadataOnError(OperationContext* opCtx,
BSONObjBuilder* metadataBob) const override {
const bool isConfig = serverGlobalParams.clusterRole == ClusterRole::ConfigServer;
if (ShardingState::get(opCtx)->enabled() || isConfig) {
auto lastCommittedOpTime =
repl::ReplicationCoordinator::get(opCtx)->getLastCommittedOpTime();
metadataBob->append(kLastCommittedOpTimeFieldName, lastCommittedOpTime.getTimestamp());
}
}
void appendReplyMetadata(OperationContext* opCtx,
const OpMsgRequest& request,
BSONObjBuilder* metadataBob) const override {
const bool isShardingAware = ShardingState::get(opCtx)->enabled();
const bool isConfig = serverGlobalParams.clusterRole == ClusterRole::ConfigServer;
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
const bool isReplSet =
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
if (isReplSet) {
// Attach our own last opTime.
repl::OpTime lastOpTimeFromClient =
repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
replCoord->prepareReplMetadata(request.body, lastOpTimeFromClient, metadataBob);
// For commands from mongos, append some info to help getLastError(w) work.
// TODO: refactor out of here as part of SERVER-18236
if (isShardingAware || isConfig) {
rpc::ShardingMetadata(lastOpTimeFromClient, replCoord->getElectionId())
.writeToMetadata(metadataBob)
.transitional_ignore();
}
if (isShardingAware || isConfig) {
auto lastCommittedOpTime = replCoord->getLastCommittedOpTime();
metadataBob->append(kLastCommittedOpTimeFieldName,
lastCommittedOpTime.getTimestamp());
}
}
// If we're a shard other than the config shard, attach the last configOpTime we know about.
if (isShardingAware && !isConfig) {
auto opTime = Grid::get(opCtx)->configOpTime();
rpc::ConfigServerMetadata(opTime).writeToMetadata(metadataBob);
}
}
void advanceConfigOptimeFromRequestMetadata(OperationContext* opCtx) const override {
// Handle config optime information that may have been sent along with the command.
rpc::advanceConfigOptimeFromRequestMetadata(opCtx);
}
std::unique_ptr<PolymorphicScoped> scopedOperationCompletionShardingActions(
OperationContext* opCtx) const override {
return std::make_unique<ScopedOperationCompletionShardingActions>(opCtx);
}
};
DbResponse ServiceEntryPointMongod::handleRequest(OperationContext* opCtx, const Message& m) {
return ServiceEntryPointCommon::handleRequest(opCtx, m, Hooks{});
}
} // namespace mongo
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