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/**
* Copyright (C) 2018-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/platform/basic.h"
#include <map>
#include <vector>
#include "mongo/bson/util/bson_extract.h"
#include "mongo/client/read_preference.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/list_databases_gen.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/commands/strategy.h"
#include "mongo/s/grid.h"
namespace mongo {
namespace {
class ListDatabasesCmd : public BasicCommand {
public:
ListDatabasesCmd() : BasicCommand("listDatabases", "listdatabases") {}
const std::set<std::string>& apiVersions() const {
return kApiVersions1;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool maintenanceOk() const override {
return false;
}
bool adminOnly() const override {
return true;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
std::string help() const override {
return "list databases in a cluster";
}
/* listDatabases is always authorized,
* however the results returned will be redacted
* based on read privileges if auth is enabled
* and the current user does not have listDatabases permisison.
*/
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) const override {
return Status::OK();
}
bool run(OperationContext* opCtx,
const std::string& dbname_unused,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
CommandHelpers::handleMarkKillOnClientDisconnect(opCtx);
IDLParserErrorContext ctx("listDatabases");
auto cmd = ListDatabases::parse(ctx, cmdObj);
auto* as = AuthorizationSession::get(opCtx->getClient());
// { nameOnly: bool } - Default false.
const bool nameOnly = cmd.getNameOnly();
// { authorizedDatabases: bool } - Dynamic default based on perms.
const bool authorizedDatabases = ([as](const boost::optional<bool>& authDB) {
const bool mayListAllDatabases = as->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(), ActionType::listDatabases);
if (authDB) {
uassert(ErrorCodes::Unauthorized,
"Insufficient permissions to list all databases",
authDB.get() || mayListAllDatabases);
return authDB.get();
}
// By default, list all databases if we can, otherwise
// only those we're allowed to find on.
return !mayListAllDatabases;
})(cmd.getAuthorizedDatabases());
auto const shardRegistry = Grid::get(opCtx)->shardRegistry();
std::map<std::string, long long> sizes;
std::map<std::string, std::unique_ptr<BSONObjBuilder>> dbShardInfo;
std::vector<ShardId> shardIds;
shardRegistry->getAllShardIdsNoReload(&shardIds);
shardIds.emplace_back(ShardRegistry::kConfigServerShardId);
// { filter: matchExpression }.
auto filteredCmd = applyReadWriteConcern(
opCtx, this, CommandHelpers::filterCommandRequestForPassthrough(cmdObj));
for (const ShardId& shardId : shardIds) {
const auto shardStatus = shardRegistry->getShard(opCtx, shardId);
if (!shardStatus.isOK()) {
continue;
}
const auto s = shardStatus.getValue();
auto response = uassertStatusOK(
s->runCommandWithFixedRetryAttempts(opCtx,
ReadPreferenceSetting::get(opCtx),
"admin",
filteredCmd,
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 auto name = dbObj["name"].String();
// If this is the admin db, only collect its stats from the config servers.
if (name == "admin" && !s->isConfig()) {
continue;
}
// We don't collect config server info for dbs other than "admin" and "config".
if (s->isConfig() && name != "config" && name != "admin") {
continue;
}
const long long size = dbObj["sizeOnDisk"].numberLong();
long long& sizeSumForDbAcrossShards = sizes[name];
if (size == 1) {
if (sizeSumForDbAcrossShards <= 1) {
sizeSumForDbAcrossShards = 1;
}
} else {
sizeSumForDbAcrossShards += size;
}
auto& bb = dbShardInfo[name];
if (!bb) {
bb.reset(new BSONObjBuilder());
}
bb->append(s->getId().toString(), size);
}
}
// Now that we have aggregated results for all the shards, convert to a response,
// and compute total sizes.
long long totalSize = 0;
std::vector<ListDatabasesReplyItem> items;
for (const auto& sizeEntry : sizes) {
const auto& name = sizeEntry.first;
const long long size = sizeEntry.second;
// Skip the local database, since all shards have their own independent local
if (name == NamespaceString::kLocalDb)
continue;
if (authorizedDatabases && !as->isAuthorizedForAnyActionOnAnyResourceInDB(name)) {
// We don't have listDatabases on the cluser or find on this database.
continue;
}
ListDatabasesReplyItem item(name);
if (!nameOnly) {
item.setSizeOnDisk(size);
item.setEmpty(size == 1);
item.setShards(dbShardInfo[name]->obj());
uassert(ErrorCodes::BadValue,
str::stream() << "Found negative 'sizeOnDisk' in: " << name,
size >= 0);
totalSize += size;
}
items.push_back(std::move(item));
}
ListDatabasesReply reply(items);
if (!nameOnly) {
reply.setTotalSize(totalSize);
reply.setTotalSizeMb(totalSize / (1024 * 1024));
}
reply.serialize(&result);
return true;
}
} listDatabasesCmd;
} // namespace
} // namespace mongo
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