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/**
* Copyright (C) 2015 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::kSharding
#include "mongo/platform/basic.h"
#include <string>
#include "mongo/base/status.h"
#include "mongo/db/service_context.h"
#include "mongo/rpc/metadata/client_metadata_ismaster.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/rpc/metadata/impersonated_user_metadata.h"
#include "mongo/rpc/metadata/metadata_hook.h"
#include "mongo/rpc/metadata/repl_set_metadata.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/sharding_egress_metadata_hook.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
namespace rpc {
ShardingEgressMetadataHook::ShardingEgressMetadataHook(ServiceContext* serviceContext)
: _serviceContext(serviceContext) {
invariant(_serviceContext);
}
Status ShardingEgressMetadataHook::writeRequestMetadata(OperationContext* opCtx,
BSONObjBuilder* metadataBob) {
try {
writeAuthDataToImpersonatedUserMetadata(opCtx, metadataBob);
ClientMetadataIsMasterState::writeToMetadata(opCtx, metadataBob);
rpc::ConfigServerMetadata(_getConfigServerOpTime()).writeToMetadata(metadataBob);
return Status::OK();
} catch (...) {
return exceptionToStatus();
}
}
Status ShardingEgressMetadataHook::readReplyMetadata(OperationContext* opCtx,
StringData replySource,
const BSONObj& metadataObj) {
try {
_saveGLEStats(metadataObj, replySource);
return _advanceConfigOptimeFromShard(replySource.toString(), metadataObj);
} catch (...) {
return exceptionToStatus();
}
}
Status ShardingEgressMetadataHook::_advanceConfigOptimeFromShard(ShardId shardId,
const BSONObj& metadataObj) {
auto const grid = Grid::get(_serviceContext);
try {
auto shard = grid->shardRegistry()->getShardNoReload(shardId);
if (!shard) {
return Status::OK();
}
// Update our notion of the config server opTime from the configOpTime in the response.
if (shard->isConfig()) {
// Config servers return the config opTime as part of their own metadata.
if (metadataObj.hasField(rpc::kReplSetMetadataFieldName)) {
auto parseStatus = rpc::ReplSetMetadata::readFromMetadata(metadataObj);
if (!parseStatus.isOK()) {
return parseStatus.getStatus();
}
// Use the last committed optime to advance config optime.
// For successful majority writes, we could use the optime of the last op
// from us and lastOpCommitted is always greater than or equal to it.
// On majority write failures, the last visible optime would be incorrect
// due to rollback as explained in SERVER-24630 and the last committed optime
// is safe to use.
const auto& replMetadata = parseStatus.getValue();
auto opTime = replMetadata.getLastOpCommitted();
grid->advanceConfigOpTime(opTime);
}
} else {
// Regular shards return the config opTime as part of ConfigServerMetadata.
auto parseStatus = rpc::ConfigServerMetadata::readFromMetadata(metadataObj);
if (!parseStatus.isOK()) {
return parseStatus.getStatus();
}
const auto& configMetadata = parseStatus.getValue();
auto opTime = configMetadata.getOpTime();
if (opTime.is_initialized()) {
grid->advanceConfigOpTime(opTime.get());
}
}
return Status::OK();
} catch (...) {
return exceptionToStatus();
}
}
} // namespace rpc
} // namespace mongo
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