void SessionPrivate::addSdSocketToCache(Future<void> f, const qi::Url& url,
qi::Promise<void> p)
{
qiLogDebug() << "addSocketToCache processing";
if (f.hasError())
{
qiLogDebug() << "addSdSocketToCache: connect reported failure";
_serviceHandler.removeService("ServiceDirectory");
p.setError(f.error());
return;
}
// Allow the SD process to use the existing socket to talk to our services
_serverObject.registerSocket(_sdClient.socket());
/* Allow reusing the SD socket for communicating with services.
* To do this, we must add it to our socket cache, and for this we need
* to know the sd machineId
*/
std::string mid;
try
{
mid = _sdClient.machineId();
}
catch (const std::exception& e)
{ // Provide a nice message for backward compatibility
qiLogVerbose() << e.what();
qiLogWarning() << "Failed to obtain machineId, connection to service directory will not be reused for other services.";
p.setValue(0);
return;
}
TransportSocketPtr s = _sdClient.socket();
qiLogVerbose() << "Inserting sd to cache for " << mid <<" " << url.str() << std::endl;
_socketsCache.insert(mid, s->remoteEndpoint(), s);
p.setValue(0);
}
/*
* Corner case to manage (TODO):
*
* You are connecting to machineId foo, you are machineId bar. foo and bar are
* on different sub-networks with the same netmask. They sadly got the same IP
* on their subnet: 192.168.1.42. When trying to connect to foo from bar, we
* will try to connect its endpoints, basically:
* - tcp://1.2.3.4:1333 (public IP)
* - tcp://192.168.1.42:1333 (subnet public IP)
* If bar is listening on port 1333, we may connect to it instead of foo (our
* real target).
*/
void TransportSocketCache::onSocketParallelConnectionAttempt(Future<void> fut,
MessageSocketPtr socket,
Url url,
const ServiceInfo& info)
{
boost::mutex::scoped_lock lock(_socketMutex);
if (_dying)
{
qiLogDebug() << "ConnectionAttempt: TransportSocketCache is closed";
if (!fut.hasError())
{
_allPendingConnections.remove(socket);
socket->disconnect();
}
return;
}
ConnectionMap::iterator machineIt = _connections.find(info.machineId());
std::map<Url, ConnectionAttemptPtr>::iterator urlIt;
if (machineIt != _connections.end())
urlIt = machineIt->second.find(url);
if (machineIt == _connections.end() || urlIt == machineIt->second.end())
{
// The socket was disconnected at some point, and we removed it from our map:
// return early.
_allPendingConnections.remove(socket);
socket->disconnect();
return;
}
ConnectionAttemptPtr attempt = urlIt->second;
attempt->attemptCount--;
if (attempt->state != State_Pending)
{
qiLogDebug() << "Already connected: reject socket " << socket.get() << " endpoint " << url.str();
_allPendingConnections.remove(socket);
socket->disconnect();
checkClear(attempt, info.machineId());
return;
}
if (fut.hasError())
{
// Failing to connect to some of the endpoint is expected.
qiLogDebug() << "Could not connect to service #" << info.serviceId() << " through url " << url.str();
_allPendingConnections.remove(socket);
// It's a critical error if we've exhausted all available endpoints.
if (attempt->attemptCount == 0)
{
std::stringstream err;
err << "Could not connect to service #" << info.serviceId() << ": no endpoint replied.";
qiLogError() << err.str();
attempt->promise.setError(err.str());
attempt->state = State_Error;
checkClear(attempt, info.machineId());
}
return;
}
qi::SignalLink disconnectionTracking = socket->disconnected.connect(
&TransportSocketCache::onSocketDisconnected, this, url, info)
.setCallType(MetaCallType_Direct);
attempt->state = State_Connected;
attempt->endpoint = socket;
attempt->promise.setValue(socket);
attempt->disconnectionTracking = disconnectionTracking;
qiLogDebug() << "Connected to service #" << info.serviceId() << " through url " << url.str() << " and socket "
<< socket.get();
}