bool OTSocket_ZMQ_2::Receive(OTString & strServerReply)
{
if (!m_bInitialized) { OT_FAIL; }
if (!m_HasContext) { OT_FAIL; }
if (NULL == m_pzmq->context_zmq) { OTLog::vError("%s: Error: %s must exist to Receive!\n", __FUNCTION__, "m_pzmq->context_zmq"); OT_FAIL; }
if (!m_bConnected && !m_bListening) return false;
if (m_bConnected && m_bListening) return false;
if (NULL == m_pzmq->socket_zmq) { OTLog::vError("%s: Error: %s must exist to Receive!\n", __FUNCTION__, "m_pzmq->socket_zmq"); OT_FAIL; }
// -----------------------------------
const long lLatencyRecvMilliSec = m_lLatencyReceiveMs;
const long lLatencyRecvMicroSec = lLatencyRecvMilliSec * 1000;
// ***********************************
// Get the reply.
zmq::message_t zmq_message;
bool bSuccessReceiving = false;
// If failure receiving, re-tries 2 times, with 4000 ms max delay between each (Doubling every time.)
//
if (m_bIsBlocking)
{
bSuccessReceiving = m_pzmq->socket_zmq->recv(&zmq_message); // Blocking.
}
else // not blocking
{
long lDoubling = lLatencyRecvMicroSec;
int nReceiveTries = m_nLatencyReceiveNoTries;
bool expect_reply = true;
while (expect_reply)
{
// Poll socket for a reply, with timeout
zmq::pollitem_t items[] = { { *m_pzmq->socket_zmq, 0, ZMQ_POLLIN, 0 } };
const int nPoll = zmq::poll(&items[0], 1, lDoubling);
lDoubling *= 2;
// If we got a reply, process it
if (items[0].revents & ZMQ_POLLIN)
{
bSuccessReceiving = m_pzmq->socket_zmq->recv(&zmq_message, ZMQ_NOBLOCK); // <=========== RECEIVE ===============
OTLog::SleepMilliseconds(1);
if (!bSuccessReceiving)
{
if (false == HandleReceivingError())
expect_reply = false;
}
else
break; // (Success -- we're done in this loop.)
}
else if (nReceiveTries == 0)
{
//OTLog::Error("OTSocket::Receive: no message.\n");
expect_reply = false;
break;
}
else if ((-1) == nPoll) // error.
{
if (false == HandlePollingError())
expect_reply = false;
}
--nReceiveTries;
}
}
// ***********************************
if (bSuccessReceiving && (zmq_message.size() > 0))
strServerReply.MemSet(static_cast<const char*>(zmq_message.data()), static_cast<uint32_t> (zmq_message.size()));
return (bSuccessReceiving && (zmq_message.size() > 0));
}
