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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/client/connection_string.h"
#include <list>
#include <memory>
#include "mongo/client/dbclient_rs.h"
#include "mongo/client/mongo_uri.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
stdx::mutex ConnectionString::_connectHookMutex;
ConnectionString::ConnectionHook* ConnectionString::_connectHook = NULL;
std::unique_ptr<DBClientBase> ConnectionString::connect(StringData applicationName,
std::string& errmsg,
double socketTimeout,
const MongoURI* uri) const {
MongoURI newURI{};
if (uri) {
newURI = *uri;
}
switch (_type) {
case MASTER: {
for (const auto& server : _servers) {
auto c = stdx::make_unique<DBClientConnection>(true, 0, newURI);
c->setSoTimeout(socketTimeout);
LOG(1) << "creating new connection to:" << server;
if (!c->connect(server, applicationName, errmsg)) {
continue;
}
LOG(1) << "connected connection!";
return std::move(c);
}
return nullptr;
}
case SET: {
auto set = stdx::make_unique<DBClientReplicaSet>(
_setName, _servers, applicationName, socketTimeout, std::move(newURI));
if (!set->connect()) {
errmsg = "connect failed to replica set ";
errmsg += toString();
return nullptr;
}
return std::move(set);
}
case CUSTOM: {
// Lock in case other things are modifying this at the same time
stdx::lock_guard<stdx::mutex> lk(_connectHookMutex);
// Allow the replacement of connections with other connections - useful for testing.
uassert(16335,
"custom connection to " + this->toString() +
" specified with no connection hook",
_connectHook);
// Double-checked lock, since this will never be active during normal operation
auto replacementConn = _connectHook->connect(*this, errmsg, socketTimeout);
log() << "replacing connection to " << this->toString() << " with "
<< (replacementConn ? replacementConn->getServerAddress() : "(empty)");
return replacementConn;
}
case LOCAL:
case INVALID:
MONGO_UNREACHABLE;
}
MONGO_UNREACHABLE;
}
} // namepspace mongo
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