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/**
* Copyright (C) 2021-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.
*/
#include "mongo/db/s/set_allow_migrations_coordinator.h"
#include "mongo/db/commands.h"
#include "mongo/db/s/sharding_logging.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/grid.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
bool isCollectionSharded(OperationContext* opCtx, const NamespaceString& nss) {
try {
Grid::get(opCtx)->catalogClient()->getCollection(opCtx, nss);
return true;
} catch (ExceptionFor<ErrorCodes::NamespaceNotFound>&) {
// The collection is unsharded or doesn't exist
return false;
}
}
void SetAllowMigrationsCoordinator::checkIfOptionsConflict(const BSONObj& doc) const {
// If we have two set allow migrations on the same namespace, then the arguments must be the
// same.
const auto otherDoc = SetAllowMigrationsCoordinatorDocument::parse(
IDLParserContext("SetAllowMigrationsCoordinatorDocument"), doc);
uassert(ErrorCodes::ConflictingOperationInProgress,
"Another set allow migrations with different arguments is already running for the same "
"namespace",
SimpleBSONObjComparator::kInstance.evaluate(
_doc.getSetAllowMigrationsRequest().toBSON() ==
otherDoc.getSetAllowMigrationsRequest().toBSON()));
}
void SetAllowMigrationsCoordinator::appendCommandInfo(BSONObjBuilder* cmdInfoBuilder) const {
stdx::lock_guard lk{_docMutex};
cmdInfoBuilder->appendElements(_doc.getSetAllowMigrationsRequest().toBSON());
}
ExecutorFuture<void> SetAllowMigrationsCoordinator::_runImpl(
std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept {
return ExecutorFuture<void>(**executor).then([this, anchor = shared_from_this()] {
auto opCtxHolder = cc().makeOperationContext();
auto* opCtx = opCtxHolder.get();
getForwardableOpMetadata().setOn(opCtx);
uassert(ErrorCodes::NamespaceNotSharded,
"Collection must be sharded so migrations can be blocked",
isCollectionSharded(opCtx, nss()));
const auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
BatchedCommandRequest updateRequest([&]() {
write_ops::UpdateCommandRequest updateOp(CollectionType::ConfigNS);
updateOp.setUpdates({[&] {
write_ops::UpdateOpEntry entry;
entry.setQ(BSON(CollectionType::kNssFieldName << nss().ns()));
if (_allowMigrations) {
entry.setU(write_ops::UpdateModification::parseFromClassicUpdate(BSON(
"$unset" << BSON(CollectionType::kPermitMigrationsFieldName << true))));
} else {
entry.setU(write_ops::UpdateModification::parseFromClassicUpdate(
BSON("$set" << BSON(CollectionType::kPermitMigrationsFieldName << false))));
}
entry.setMulti(false);
return entry;
}()});
return updateOp;
}());
updateRequest.setWriteConcern(ShardingCatalogClient::kMajorityWriteConcern.toBSON());
auto response = configShard->runBatchWriteCommand(opCtx,
Shard::kDefaultConfigCommandTimeout,
updateRequest,
Shard::RetryPolicy::kIdempotent);
uassertStatusOK(response.toStatus());
ShardingLogging::get(opCtx)->logChange(
opCtx, "setPermitMigrations", nss().ns(), BSON("permitMigrations" << _allowMigrations));
});
}
} // namespace mongo
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