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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.
*/
#include "mongo/platform/basic.h"
#include <map>
#include <string>
#include <vector>
#include "mongo/client/read_preference.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/commands.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
namespace mongo {
using std::unique_ptr;
using std::map;
using std::string;
using std::vector;
namespace {
class ListDatabasesCmd : public Command {
public:
ListDatabasesCmd() : Command("listDatabases", true, "listdatabases") {}
virtual bool slaveOk() const {
return true;
}
virtual bool slaveOverrideOk() const {
return true;
}
virtual bool adminOnly() const {
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void help(std::stringstream& help) const {
help << "list databases in a cluster";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::listDatabases);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
virtual bool run(OperationContext* txn,
const std::string& dbname_unused,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
map<string, long long> sizes;
map<string, unique_ptr<BSONObjBuilder>> dbShardInfo;
vector<ShardId> shardIds;
grid.shardRegistry()->getAllShardIds(&shardIds);
for (const ShardId& shardId : shardIds) {
const auto shardStatus = grid.shardRegistry()->getShard(txn, shardId);
if (!shardStatus.isOK()) {
continue;
}
const auto s = shardStatus.getValue();
auto response = uassertStatusOK(s->runCommandWithFixedRetryAttempts(
txn,
ReadPreferenceSetting{ReadPreference::PrimaryPreferred},
"admin",
BSON("listDatabases" << 1),
Shard::RetryPolicy::kIdempotent));
uassertStatusOK(response.commandStatus);
BSONObj x = std::move(response.response);
BSONObjIterator j(x["databases"].Obj());
while (j.more()) {
BSONObj dbObj = j.next().Obj();
const string name = dbObj["name"].String();
const long long size = dbObj["sizeOnDisk"].numberLong();
long long& totalSize = sizes[name];
if (size == 1) {
if (totalSize <= 1) {
totalSize = 1;
}
} else {
totalSize += size;
}
unique_ptr<BSONObjBuilder>& bb = dbShardInfo[name];
if (!bb.get()) {
bb.reset(new BSONObjBuilder());
}
bb->appendNumber(s->getId().toString(), size);
}
}
long long totalSize = 0;
BSONArrayBuilder dbListBuilder(result.subarrayStart("databases"));
for (map<string, long long>::iterator i = sizes.begin(); i != sizes.end(); ++i) {
const string name = i->first;
if (name == "local") {
// We don't return local, since all shards have their own independent local
continue;
}
if (name == "config" || name == "admin") {
// Always get this from the config servers
continue;
}
long long size = i->second;
totalSize += size;
BSONObjBuilder temp;
temp.append("name", name);
temp.appendNumber("sizeOnDisk", size);
temp.appendBool("empty", size == 1);
temp.append("shards", dbShardInfo[name]->obj());
dbListBuilder.append(temp.obj());
}
// Get information for config and admin dbs from the config servers.
auto catalogClient = grid.catalogClient(txn);
auto appendStatus = catalogClient->appendInfoForConfigServerDatabases(txn, &dbListBuilder);
if (!appendStatus.isOK()) {
return Command::appendCommandStatus(result, appendStatus);
}
dbListBuilder.done();
result.appendNumber("totalSize", totalSize);
result.appendNumber("totalSizeMb", totalSize / (1024 * 1024));
return true;
}
} clusterCmdListDatabases;
} // namespace
} // namespace mongo
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