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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::kCommand
#include "mongo/platform/basic.h"
#include "mongo/base/status.h"
#include "mongo/db/commands.h"
#include "mongo/db/operation_context.h"
#include "mongo/s/catalog/dist_lock_manager.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_database.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/commands/cluster_commands_common.h"
#include "mongo/s/commands/sharded_command_processing.h"
#include "mongo/s/grid.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
class DropDatabaseCmd : public Command {
public:
DropDatabaseCmd() : Command("dropDatabase") {}
bool slaveOk() const override {
return true;
}
bool adminOnly() const override {
return false;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) override {
ActionSet actions;
actions.addAction(ActionType::dropDatabase);
out->push_back(Privilege(ResourcePattern::forDatabaseName(dbname), actions));
}
bool run(OperationContext* opCtx,
const std::string& dbname,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) override {
uassert(ErrorCodes::IllegalOperation,
"Cannot drop the config database",
dbname != NamespaceString::kConfigDb);
uassert(ErrorCodes::BadValue,
"have to pass 1 as db parameter",
cmdObj.firstElement().isNumber() && cmdObj.firstElement().number() == 1);
auto const catalogClient = Grid::get(opCtx)->catalogClient(opCtx);
// Lock the database globally to prevent conflicts with simultaneous database
// creation/modification.
auto scopedDistLock = uassertStatusOK(catalogClient->getDistLockManager()->lock(
opCtx, dbname, "dropDatabase", DistLockManager::kDefaultLockTimeout));
auto const catalogCache = Grid::get(opCtx)->catalogCache();
// Refresh the database metadata so it kicks off a full reload
catalogCache->purgeDatabase(dbname);
auto dbInfoStatus = catalogCache->getDatabase(opCtx, dbname);
if (dbInfoStatus == ErrorCodes::NamespaceNotFound) {
result.append("info", "database does not exist");
return true;
}
uassertStatusOK(dbInfoStatus.getStatus());
catalogClient->logChange(opCtx,
"dropDatabase.start",
dbname,
BSONObj(),
ShardingCatalogClient::kMajorityWriteConcern);
auto& dbInfo = dbInfoStatus.getValue();
// Drop the database's collections from metadata
for (const auto& nss : getAllShardedCollectionsForDb(opCtx, dbname)) {
uassertStatusOK(catalogClient->dropCollection(opCtx, nss));
}
// Drop the database from the primary shard first
_dropDatabaseFromShard(opCtx, dbInfo.primaryId(), dbname);
// Drop the database from each of the remaining shards
{
std::vector<ShardId> allShardIds;
Grid::get(opCtx)->shardRegistry()->getAllShardIds(&allShardIds);
for (const ShardId& shardId : allShardIds) {
_dropDatabaseFromShard(opCtx, shardId, dbname);
}
}
// Remove the database entry from the metadata
Status status =
catalogClient->removeConfigDocuments(opCtx,
DatabaseType::ConfigNS,
BSON(DatabaseType::name(dbname)),
ShardingCatalogClient::kMajorityWriteConcern);
if (!status.isOK()) {
uassertStatusOK({status.code(),
str::stream() << "Could not remove database '" << dbname
<< "' from metadata due to "
<< status.reason()});
}
// Invalidate the database so the next access will do a full reload
catalogCache->purgeDatabase(dbname);
catalogClient->logChange(
opCtx, "dropDatabase", dbname, BSONObj(), ShardingCatalogClient::kMajorityWriteConcern);
result.append("dropped", dbname);
return true;
}
private:
/**
* Sends the 'dropDatabase' command for the specified database to the specified shard. Throws
* DBException on failure.
*/
static void _dropDatabaseFromShard(OperationContext* opCtx,
const ShardId& shardId,
const std::string& dbName) {
const auto dropDatabaseCommandBSON = [opCtx, &dbName] {
BSONObjBuilder builder;
builder.append("dropDatabase", 1);
if (!opCtx->getWriteConcern().usedDefault) {
builder.append(WriteConcernOptions::kWriteConcernField,
opCtx->getWriteConcern().toBSON());
}
return builder.obj();
}();
const auto shard =
uassertStatusOK(Grid::get(opCtx)->shardRegistry()->getShard(opCtx, shardId));
auto cmdDropDatabaseResult = uassertStatusOK(shard->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
dbName,
dropDatabaseCommandBSON,
Shard::RetryPolicy::kIdempotent));
uassertStatusOK(cmdDropDatabaseResult.commandStatus);
uassertStatusOK(cmdDropDatabaseResult.writeConcernStatus);
}
} clusterDropDatabaseCmd;
} // namespace
} // namespace mongo
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