bool BlockingTCPAcceptor::validateConnection(Transport::shared_pointer const & transport, const char* address) {
try {
return transport->verify(5000);
} catch(...) {
LOG(logLevelDebug, "Validation of %s failed.", address);
return false;
}
}
Transport::shared_pointer BlockingTCPConnector::connect(std::tr1::shared_ptr<ClientChannelImpl> const & client,
ResponseHandler::shared_pointer const & responseHandler, osiSockAddr& address,
int8 transportRevision, int16 priority) {
SOCKET socket = INVALID_SOCKET;
char ipAddrStr[64];
ipAddrToDottedIP(&address.ia, ipAddrStr, sizeof(ipAddrStr));
Context::shared_pointer context = _context.lock();
TransportRegistry::Reservation rsvp(context->getTransportRegistry(),
address, priority);
// we are now blocking any connect() to this destination (address and prio)
// concurrent connect() to other destination is allowed.
// This prevents us from opening duplicate connections.
Transport::shared_pointer transport = context->getTransportRegistry()->get(address, priority);
if(transport.get()) {
LOG(logLevelDebug,
"Reusing existing connection to PVA server: %s.",
ipAddrStr);
if (transport->acquire(client))
return transport;
}
try {
LOG(logLevelDebug, "Connecting to PVA server: %s.", ipAddrStr);
socket = tryConnect(address, 3);
LOG(logLevelDebug, "Socket connected to PVA server: %s.", ipAddrStr);
// enable TCP_NODELAY (disable Nagle's algorithm)
int optval = 1; // true
int retval = ::setsockopt(socket, IPPROTO_TCP, TCP_NODELAY,
(char *)&optval, sizeof(int));
if(retval<0) {
char errStr[64];
epicsSocketConvertErrnoToString(errStr, sizeof(errStr));
LOG(logLevelWarn, "Error setting TCP_NODELAY: %s.", errStr);
}
// enable TCP_KEEPALIVE
retval = ::setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE,
(char *)&optval, sizeof(int));
if(retval<0)
{
char errStr[64];
epicsSocketConvertErrnoToString(errStr, sizeof(errStr));
LOG(logLevelWarn, "Error setting SO_KEEPALIVE: %s.", errStr);
}
// TODO tune buffer sizes?! Win32 defaults are 8k, which is OK
// create transport
// TODO introduce factory
// get TCP send buffer size
osiSocklen_t intLen = sizeof(int);
int _socketSendBufferSize;
retval = getsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char *)&_socketSendBufferSize, &intLen);
if(retval<0) {
char strBuffer[64];
epicsSocketConvertErrnoToString(strBuffer, sizeof(strBuffer));
LOG(logLevelDebug, "Error getting SO_SNDBUF: %s.", strBuffer);
}
// create() also adds to context connection pool _context->getTransportRegistry()
transport = detail::BlockingClientTCPTransportCodec::create(
context, socket, responseHandler, _receiveBufferSize, _socketSendBufferSize,
client, transportRevision, _heartbeatInterval, priority);
// verify
if(!transport->verify(5000)) {
LOG(
logLevelDebug,
"Connection to PVA server %s failed to be validated, closing it.",
ipAddrStr);
std::ostringstream temp;
temp<<"Failed to verify TCP connection to '"<<ipAddrStr<<"'.";
THROW_BASE_EXCEPTION(temp.str().c_str());
}
LOG(logLevelDebug, "Connected to PVA server: %s.", ipAddrStr);
return transport;
} catch(std::exception&) {
if(transport.get())
transport->close();
else if(socket!=INVALID_SOCKET)
epicsSocketDestroy(socket);
throw;
}
}