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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 "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/migration_chunk_cloner_source_legacy.h"
#include "mongo/db/s/migration_source_manager.h"
#include "mongo/db/s/sharding_state.h"
/**
* This file contains commands, which are specific to the legacy chunk cloner source.
*/
namespace mongo {
namespace {
/**
* Shortcut class to perform the appropriate checks and acquire the cloner associated with the
* currently active migration. Uses the currently registered migration for this shard and ensures
* the session ids match.
*/
class AutoGetActiveCloner {
MONGO_DISALLOW_COPYING(AutoGetActiveCloner);
public:
AutoGetActiveCloner(OperationContext* opCtx, const MigrationSessionId& migrationSessionId)
: _scopedXact(opCtx, MODE_IS) {
ShardingState* const gss = ShardingState::get(opCtx);
const auto nss = gss->getActiveDonateChunkNss();
uassert(ErrorCodes::NotYetInitialized, "No active migrations were found", nss);
// Once the collection is locked, the migration status cannot change
_autoColl.emplace(opCtx, *nss, MODE_IS);
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "Collection " << nss->ns() << " does not exist",
_autoColl->getCollection());
auto css = CollectionShardingState::get(opCtx, *nss);
uassert(ErrorCodes::IllegalOperation,
str::stream() << "No active migrations were found for collection " << nss->ns(),
css && css->getMigrationSourceManager());
// It is now safe to access the cloner
_chunkCloner = dynamic_cast<MigrationChunkClonerSourceLegacy*>(
css->getMigrationSourceManager()->getCloner());
invariant(_chunkCloner);
// Ensure the session ids are correct
uassert(ErrorCodes::IllegalOperation,
str::stream() << "Requested migration session id " << migrationSessionId.toString()
<< " does not match active session id "
<< _chunkCloner->getSessionId().toString(),
migrationSessionId.matches(_chunkCloner->getSessionId()));
}
Database* getDb() const {
invariant(_autoColl);
return _autoColl->getDb();
}
Collection* getColl() const {
invariant(_autoColl);
return _autoColl->getCollection();
}
MigrationChunkClonerSourceLegacy* getCloner() const {
invariant(_chunkCloner);
return _chunkCloner;
}
private:
// Scoped transaction to reset the WT snapshot
ScopedTransaction _scopedXact;
// Scoped database + collection lock
boost::optional<AutoGetCollection> _autoColl;
// Contains the active cloner for the namespace
MigrationChunkClonerSourceLegacy* _chunkCloner;
};
class InitialCloneCommand : public Command {
public:
InitialCloneCommand() : Command("_migrateClone") {}
void help(std::stringstream& h) const {
h << "internal";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual bool slaveOk() const {
return false;
}
virtual bool adminOnly() const {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* opCtx,
const std::string&,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
const MigrationSessionId migrationSessionId(
uassertStatusOK(MigrationSessionId::extractFromBSON(cmdObj)));
boost::optional<BSONArrayBuilder> arrBuilder;
// Try to maximize on the size of the buffer, which we are returning in order to have less
// round-trips
int arrSizeAtPrevIteration = -1;
while (!arrBuilder || arrBuilder->arrSize() > arrSizeAtPrevIteration) {
AutoGetActiveCloner autoCloner(opCtx, migrationSessionId);
if (!arrBuilder) {
arrBuilder.emplace(autoCloner.getCloner()->getCloneBatchBufferAllocationSize());
}
arrSizeAtPrevIteration = arrBuilder->arrSize();
uassertStatusOK(autoCloner.getCloner()->nextCloneBatch(
opCtx, autoCloner.getColl(), arrBuilder.get_ptr()));
}
invariant(arrBuilder);
result.appendArray("objects", arrBuilder->arr());
return true;
}
} initialCloneCommand;
class TransferModsCommand : public Command {
public:
TransferModsCommand() : Command("_transferMods") {}
void help(std::stringstream& h) const {
h << "internal";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual bool slaveOk() const {
return false;
}
virtual bool adminOnly() const {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::internal);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
bool run(OperationContext* opCtx,
const std::string&,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
const MigrationSessionId migrationSessionId(
uassertStatusOK(MigrationSessionId::extractFromBSON(cmdObj)));
AutoGetActiveCloner autoCloner(opCtx, migrationSessionId);
uassertStatusOK(autoCloner.getCloner()->nextModsBatch(opCtx, autoCloner.getDb(), &result));
return true;
}
} transferModsCommand;
} // namespace
} // namespace mongo
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