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/**
* Copyright (C) 2014 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::kDefault
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/instance.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/log.h"
namespace mongo {
using std::unique_ptr;
using std::endl;
using std::string;
// Called from scripting/engine.cpp and scripting/v8_db.cpp.
DBClientBase* createDirectClient(OperationContext* txn) {
return new DBDirectClient(txn);
}
namespace {
class DirectClientScope {
MONGO_DISALLOW_COPYING(DirectClientScope);
public:
explicit DirectClientScope(OperationContext* txn)
: _txn(txn), _prev(_txn->getClient()->isInDirectClient()) {
_txn->getClient()->setInDirectClient(true);
}
~DirectClientScope() {
_txn->getClient()->setInDirectClient(_prev);
}
private:
OperationContext* const _txn;
const bool _prev;
};
} // namespace
DBDirectClient::DBDirectClient(OperationContext* txn) : _txn(txn) {}
bool DBDirectClient::isFailed() const {
return false;
}
bool DBDirectClient::isStillConnected() {
return true;
}
std::string DBDirectClient::toString() const {
return "DBDirectClient";
}
std::string DBDirectClient::getServerAddress() const {
return "localhost"; // TODO: should this have the port?
}
void DBDirectClient::sayPiggyBack(Message& toSend) {
// don't need to piggy back when connected locally
return say(toSend);
}
bool DBDirectClient::callRead(Message& toSend, Message& response) {
return call(toSend, response);
}
ConnectionString::ConnectionType DBDirectClient::type() const {
return ConnectionString::MASTER;
}
double DBDirectClient::getSoTimeout() const {
return 0;
}
bool DBDirectClient::lazySupported() const {
return true;
}
void DBDirectClient::setOpCtx(OperationContext* txn) {
_txn = txn;
}
QueryOptions DBDirectClient::_lookupAvailableOptions() {
// Exhaust mode is not available in DBDirectClient.
return QueryOptions(DBClientBase::_lookupAvailableOptions() & ~QueryOption_Exhaust);
}
bool DBDirectClient::call(Message& toSend, Message& response, bool assertOk, string* actualServer) {
DirectClientScope directClientScope(_txn);
LastError::get(_txn->getClient()).startRequest();
DbResponse dbResponse;
CurOp curOp(_txn);
assembleResponse(_txn, toSend, dbResponse, dummyHost);
verify(dbResponse.response);
// can get rid of this if we make response handling smarter
dbResponse.response->concat();
response = *dbResponse.response;
return true;
}
void DBDirectClient::say(Message& toSend, bool isRetry, string* actualServer) {
DirectClientScope directClientScope(_txn);
LastError::get(_txn->getClient()).startRequest();
DbResponse dbResponse;
CurOp curOp(_txn);
assembleResponse(_txn, toSend, dbResponse, dummyHost);
}
unique_ptr<DBClientCursor> DBDirectClient::query(const string& ns,
Query query,
int nToReturn,
int nToSkip,
const BSONObj* fieldsToReturn,
int queryOptions,
int batchSize) {
return DBClientBase::query(
ns, query, nToReturn, nToSkip, fieldsToReturn, queryOptions, batchSize);
}
void DBDirectClient::killCursor(long long id) {
// The killCursor command on the DB client is only used by sharding,
// so no need to have it for MongoD.
verify(!"killCursor should not be used in MongoD");
}
const HostAndPort DBDirectClient::dummyHost("0.0.0.0", 0);
unsigned long long DBDirectClient::count(
const string& ns, const BSONObj& query, int options, int limit, int skip) {
BSONObj cmdObj = _countCmd(ns, query, options, limit, skip);
NamespaceString nsString(ns);
std::string dbname = nsString.db().toString();
Command* countCmd = Command::findCommand("count");
invariant(countCmd);
std::string errmsg;
BSONObjBuilder result;
bool runRetval = countCmd->run(_txn, dbname, cmdObj, options, errmsg, result);
if (!runRetval) {
Command::appendCommandStatus(result, runRetval, errmsg);
Status commandStatus = Command::getStatusFromCommandResult(result.obj());
invariant(!commandStatus.isOK());
uassertStatusOK(commandStatus);
}
BSONObj resultObj = result.obj();
return static_cast<unsigned long long>(resultObj["n"].numberLong());
}
} // namespace mongo
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