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// @file
/*
* Copyright (C) 2010 10gen 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/>.
*/
#pragma once
#include <map>
#include "mongo/db/auth/authorization_manager.h"
namespace mongo {
/** here we keep a single connection (with reconnect) for a set of hosts,
one each, and allow one user at a time per host. if in use already for that
host, we block. so this is an easy way to keep a 1-deep pool of connections
that many threads can share.
thread-safe.
Example:
{
ScopedConn c("foo.acme.com:9999");
c->runCommand(...);
}
throws exception on connect error (but fine to try again later with a new
scopedconn object for same host).
*/
class ScopedConn {
public:
// A flag to keep ScopedConns open when all other sockets are disconnected
static const unsigned keepOpen;
/** throws assertions if connect failure etc. */
ScopedConn(const std::string& hostport);
~ScopedConn() {
// conLock releases...
}
void reconnect() {
connInfo->cc.reset(new DBClientConnection(true, 0, connInfo->getTimeout()));
connInfo->cc->_logLevel = 2;
connInfo->connected = false;
connect();
}
void setTimeout(time_t timeout) {
connInfo->setTimeout(timeout);
}
/* If we were to run a query and not exhaust the cursor, future use of the connection would be problematic.
So here what we do is wrapper known safe methods and not allow cursor-style queries at all. This makes
ScopedConn limited in functionality but very safe. More non-cursor wrappers can be added here if needed.
*/
bool runCommand(const string &dbname, const BSONObj& cmd, BSONObj &info, int options=0) {
return conn()->runCommand(dbname, cmd, info, options);
}
unsigned long long count(const string &ns) {
return conn()->count(ns);
}
BSONObj findOne(const string &ns, const Query& q, const BSONObj *fieldsToReturn = 0, int queryOptions = 0) {
return conn()->findOne(ns, q, fieldsToReturn, queryOptions);
}
private:
auto_ptr<scoped_lock> connLock;
static mongo::mutex mapMutex;
struct ConnectionInfo {
mongo::mutex lock;
scoped_ptr<DBClientConnection> cc;
bool connected;
ConnectionInfo() : lock("ConnectionInfo"),
cc(new DBClientConnection(/*reconnect*/ true,
/*replicaSet*/ 0,
/*timeout*/ ReplSetConfig::DEFAULT_HB_TIMEOUT)),
connected(false) {
cc->_logLevel = 2;
}
void tagPort() {
MessagingPort& mp = cc->port();
mp.tag |= ScopedConn::keepOpen;
}
void setTimeout(time_t timeout) {
_timeout = timeout;
cc->setSoTimeout(_timeout);
}
int getTimeout() {
return _timeout;
}
private:
int _timeout;
} *connInfo;
typedef map<string,ScopedConn::ConnectionInfo*> M;
static M& _map;
scoped_ptr<DBClientConnection>& conn() { return connInfo->cc; }
const string _hostport;
// we should already be locked...
bool connect() {
string err;
if (!connInfo->cc->connect(_hostport, err)) {
log() << "couldn't connect to " << _hostport << ": " << err << rsLog;
return false;
}
connInfo->connected = true;
connInfo->tagPort();
// if we cannot authenticate against a member, then either its key file
// or our key file has to change. if our key file has to change, we'll
// be rebooting. if their file has to change, they'll be rebooted so the
// connection created above will go dead, reconnect, and reauth.
if (AuthorizationManager::isAuthEnabled()) {
if (!connInfo->cc->auth("local",
internalSecurity.user,
internalSecurity.pwd,
err,
false)) {
log() << "could not authenticate against " << _hostport << ", " << err << rsLog;
return false;
}
}
return true;
}
};
inline ScopedConn::ScopedConn(const std::string& hostport) : _hostport(hostport) {
bool first = false;
{
scoped_lock lk(mapMutex);
connInfo = _map[_hostport];
if( connInfo == 0 ) {
connInfo = _map[_hostport] = new ConnectionInfo();
first = true;
connLock.reset( new scoped_lock(connInfo->lock) );
}
}
// already locked connLock above
if (first) {
connect();
return;
}
connLock.reset( new scoped_lock(connInfo->lock) );
if (connInfo->connected) {
return;
}
// Keep trying to connect if we're not yet connected
connect();
}
}
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