DBClientConnection * DBClientReplicaSet::checkMaster() {
ReplicaSetMonitorPtr monitor = _getMonitor();
HostAndPort h = monitor->getMasterOrUassert();
if ( h == _masterHost && _master ) {
// a master is selected. let's just make sure connection didn't die
if ( ! _master->isFailed() )
return _master.get();
monitor->failedHost( _masterHost );
h = monitor->getMasterOrUassert(); // old master failed, try again.
}
_masterHost = h;
ConnectionString connStr(_masterHost);
string errmsg;
DBClientConnection* newConn = NULL;
try {
// Needs to perform a dynamic_cast because we need to set the replSet
// callback. We should eventually not need this after we remove the
// callback.
newConn = dynamic_cast<DBClientConnection*>(
connStr.connect(errmsg, _so_timeout));
}
catch (const AssertionException& ex) {
errmsg = ex.toString();
}
if (newConn == NULL || !errmsg.empty()) {
monitor->failedHost(_masterHost);
uasserted(13639, str::stream() << "can't connect to new replica set master ["
<< _masterHost.toString() << "]"
<< (errmsg.empty()? "" : ", err: ") << errmsg);
}
_master.reset(newConn);
_master->setReplSetClientCallback(this);
_master->setRunCommandHook(_runCommandHook);
_master->setPostRunCommandHook(_postRunCommandHook);
_auth( _master.get() );
return _master.get();
}
Status DBClientShardResolver::findMaster( const std::string connString,
ConnectionString* resolvedHost ) {
std::string errMsg;
ConnectionString rawHost = ConnectionString::parse( connString, errMsg );
dassert( errMsg == "" );
dassert( rawHost.type() == ConnectionString::SET
|| rawHost.type() == ConnectionString::MASTER );
if ( rawHost.type() == ConnectionString::MASTER ) {
*resolvedHost = rawHost;
return Status::OK();
}
//
// If we need to, then get the particular node we're targeting in the replica set
//
// Don't create the monitor unless we need to - fast path
ReplicaSetMonitorPtr replMonitor = ReplicaSetMonitor::get(rawHost.getSetName());
if (!replMonitor) {
// Slow path
std::set<HostAndPort> seedServers(rawHost.getServers().begin(),
rawHost.getServers().end());
ReplicaSetMonitor::createIfNeeded(rawHost.getSetName(), seedServers);
replMonitor = ReplicaSetMonitor::get(rawHost.getSetName());
}
if (!replMonitor) {
return Status( ErrorCodes::ReplicaSetNotFound,
string("unknown replica set ") + rawHost.getSetName() );
}
try {
// This can throw when we don't find a master!
HostAndPort masterHostAndPort = replMonitor->getMasterOrUassert();
*resolvedHost = ConnectionString::parse( masterHostAndPort.toString(), errMsg );
dassert( errMsg == "" );
return Status::OK();
}
catch ( const DBException& ) {
return Status( ErrorCodes::HostNotFound,
string("could not contact primary for replica set ")
+ replMonitor->getName() );
}
// Unreachable
dassert( false );
return Status( ErrorCodes::UnknownError, "" );
}
Status DBClientShardResolver::findMaster( const std::string connString,
ConnectionString* resolvedHost ) {
std::string errMsg;
ConnectionString rawHost = ConnectionString::parse( connString, errMsg );
dassert( errMsg == "" );
dassert( rawHost.type() == ConnectionString::SET
|| rawHost.type() == ConnectionString::MASTER );
if ( rawHost.type() == ConnectionString::MASTER ) {
*resolvedHost = rawHost;
return Status::OK();
}
//
// If we need to, then get the particular node we're targeting in the replica set
//
// Does not reload the monitor if it doesn't currently exist
ReplicaSetMonitorPtr replMonitor = ReplicaSetMonitor::get( rawHost.getSetName(),
false );
if ( !replMonitor ) {
return Status( ErrorCodes::ReplicaSetNotFound,
string("unknown replica set ") + rawHost.getSetName() );
}
try {
// This can throw when we don't find a master!
HostAndPort masterHostAndPort = replMonitor->getMasterOrUassert();
*resolvedHost = ConnectionString::parse( masterHostAndPort.toString( true ), errMsg );
dassert( errMsg == "" );
return Status::OK();
}
catch ( const DBException& ) {
return Status( ErrorCodes::HostNotFound,
string("could not contact primary for replica set ")
+ replMonitor->getName() );
}
// Unreachable
dassert( false );
return Status( ErrorCodes::UnknownError, "" );
}