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/**
* Copyright (C) 2016 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_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/feature_compatibility_version.h"
#include "mongo/db/commands/feature_compatibility_version_command_parser.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/s/catalog/sharding_catalog_client_impl.h"
#include "mongo/s/catalog/sharding_catalog_manager.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/util/log.h"
#include "mongo/util/uuid.h"
namespace mongo {
using CollectionUUID = UUID;
namespace {
/**
* Internal sharding command run on config servers to set featureCompatibilityVersion on all shards.
*
* Format:
* {
* _configsvrSetFeatureCompatibilityVersion: <string version>
* }
*/
class ConfigSvrSetFeatureCompatibilityVersionCommand : public Command {
public:
ConfigSvrSetFeatureCompatibilityVersionCommand()
: Command("_configsvrSetFeatureCompatibilityVersion") {}
void help(std::stringstream& help) const override {
help << "Internal command, which is exported by the sharding config server. Do not call "
"directly. Sets featureCompatibilityVersion on all shards. See "
"http://dochub.mongodb.org/core/3.6-feature-compatibility.";
}
bool slaveOk() const override {
return false;
}
bool adminOnly() const override {
return true;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) override {
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(), ActionType::internal)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
bool run(OperationContext* opCtx,
const std::string& unusedDbName,
const BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& result) override {
const auto version = uassertStatusOK(
FeatureCompatibilityVersionCommandParser::extractVersionFromCommand(getName(), cmdObj));
uassert(ErrorCodes::IllegalOperation,
str::stream() << getName()
<< " can only be run on config servers. See "
"http://dochub.mongodb.org/core/3.6-feature-compatibility.",
serverGlobalParams.clusterRole == ClusterRole::ConfigServer);
// Remove after 3.4 -> 3.6 upgrade.
if (version == FeatureCompatibilityVersionCommandParser::kVersion36) {
_generateUUIDsForExistingShardedCollections(opCtx);
}
// Forward to all shards.
uassertStatusOK(Grid::get(opCtx)->catalogManager()->setFeatureCompatibilityVersionOnShards(
opCtx, version));
// On success, set featureCompatibilityVersion on self.
FeatureCompatibilityVersion::set(opCtx, version);
return true;
}
private:
/**
* Iterates through each entry in config.collections that does not have a UUID, generates a UUID
* for the collection, and updates the entry with the generated UUID.
*
* Remove after 3.4 -> 3.6 upgrade.
*/
void _generateUUIDsForExistingShardedCollections(OperationContext* opCtx) {
// Retrieve all collections in config.collections that do not have a UUID. Some collections
// may already have a UUID if an earlier upgrade attempt failed after making some progress.
auto shardedColls =
uassertStatusOK(
Grid::get(opCtx)->shardRegistry()->getConfigShard()->exhaustiveFindOnConfig(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
repl::ReadConcernLevel::kLocalReadConcern,
NamespaceString(CollectionType::ConfigNS),
BSON(CollectionType::uuid.name() << BSON("$exists" << false)), // query
BSONObj(), // sort
boost::none // limit
))
.docs;
// Generate and persist a new UUID for each collection that did not have a UUID.
LOG(0) << "generating UUIDs for all sharded collections that do not yet have one";
for (auto& coll : shardedColls) {
auto collType = uassertStatusOK(CollectionType::fromBSON(coll));
invariant(!collType.getUUID());
auto uuid = CollectionUUID::gen();
collType.setUUID(uuid);
uassertStatusOK(ShardingCatalogClientImpl::updateShardingCatalogEntryForCollection(
opCtx, collType.getNs().ns(), collType, false /* upsert */));
LOG(2) << "updated entry in config.collections for sharded collection "
<< collType.getNs() << " with generated UUID " << uuid;
}
}
} configsvrSetFeatureCompatibilityVersionCmd;
} // namespace
} // namespace mongo
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