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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.
*/
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/client.h"
#include "mongo/db/instance.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/log.h"
namespace mongo {
// Called from scripting/engine.cpp and scripting/v8_db.cpp.
DBClientBase* createDirectClient(OperationContext* txn) {
return new DBDirectClient(txn);
}
namespace {
class GodScope {
MONGO_DISALLOW_COPYING(GodScope);
public:
GodScope(OperationContext* txn) : _txn(txn) {
_prev = _txn->getClient()->setGod(true);
}
~GodScope() {
_txn->getClient()->setGod(_prev);
}
private:
bool _prev;
OperationContext* _txn;
};
} // 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) {
GodScope gs(_txn);
if (lastError._get()) {
lastError.startRequest(toSend, lastError._get());
}
DbResponse dbResponse;
assembleResponse(_txn, toSend, dbResponse, dummyHost, true);
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) {
GodScope gs(_txn);
if (lastError._get()) {
lastError.startRequest(toSend, lastError._get());
}
DbResponse dbResponse;
assembleResponse(_txn, toSend, dbResponse, dummyHost, true);
}
auto_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);
extern long long runCount(OperationContext* txn,
const string& ns,
const BSONObj &cmd,
string &err,
int &errCode);
unsigned long long DBDirectClient::count(const string& ns,
const BSONObj& query,
int options,
int limit,
int skip) {
if (skip < 0) {
warning() << "setting negative skip value: " << skip
<< " to zero in query: " << query << endl;
skip = 0;
}
string errmsg;
int errCode;
long long res = runCount(_txn,
ns,
_countCmd(ns, query, options, limit, skip),
errmsg,
errCode);
if (res == -1) {
// namespace doesn't exist
return 0;
}
massert(errCode, str::stream() << "count failed in DBDirectClient: " << errmsg, res >= 0);
return (unsigned long long)res;
}
} // namespace mongo
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