static void nn_req_action_send (struct nn_req *self)
{
int rc;
struct nn_msg msg;
/* Send the request. */
nn_msg_cp (&msg, &self->request);
rc = nn_xreq_send (&self->xreq.sockbase, &msg);
/* If the request cannot be sent at the moment wait till
new outbound pipe arrives. */
if (nn_slow (rc == -EAGAIN)) {
nn_msg_term (&msg);
self->state = NN_REQ_STATE_DELAYED;
return;
}
/* Request was successfully sent. Set up the re-send timer
in case the request gets lost somewhere further out
in the topology. */
if (nn_fast (rc == 0)) {
nn_timer_start (&self->timer, self->resend_ivl);
self->state = NN_REQ_STATE_ACTIVE;
return;
}
/* Unexpected error. */
errnum_assert (0, -rc);
}
static int nn_req_send (struct nn_sockbase *self, struct nn_msg *msg)
{
int rc;
struct nn_req *req;
req = nn_cont (self, struct nn_req, xreq.sockbase);
/* If there's a request in progress, cancel it. */
if (nn_slow (req->state != NN_REQ_STATE_IDLE)) {
if (req->state == NN_REQ_STATE_UNSENT ||
req->state == NN_REQ_STATE_SENT)
nn_msg_term (&req->request);
if (req->state == NN_REQ_STATE_RECEIVED)
nn_msg_term (&req->reply);
nn_timer_term (&req->resend_timer);
req->state = NN_REQ_STATE_IDLE;
}
/* Generate new request ID for the new request and put it into message
header. The most important bit is set to 1 to indicate that this is
the bottom of the backtrace stack. */
++req->reqid;
nn_assert (nn_chunkref_size (&msg->hdr) == 0);
nn_chunkref_term (&msg->hdr);
nn_chunkref_init (&msg->hdr, 4);
nn_putl (nn_chunkref_data (&msg->hdr), req->reqid | 0x80000000);
/* Store the message so that it can be re-sent if there's no reply.
Then make a copy of it and send it. */
nn_msg_cp (&req->request, msg);
rc = nn_xreq_send (&req->xreq.sockbase, msg);
errnum_assert (rc == 0 || rc == -EAGAIN, -rc);
/* If the request cannot be sent at the moment switch to UNSENT state.
It will be sent as soon as a new outbound pipe arrives. */
if (nn_slow (rc == -EAGAIN)) {
nn_msg_term (msg);
req->state = NN_REQ_STATE_UNSENT;
return 0;
}
/* If the request was successgfully sent set up the re-send timer in case
it get lost somewhere further out in the topology. */
nn_timer_start (&req->resend_timer, req->resend_ivl);
req->state = NN_REQ_STATE_SENT;
return 0;
}
static void nn_req_out (struct nn_sockbase *self, struct nn_pipe *pipe)
{
int rc;
struct nn_req *req;
struct nn_msg msg;
req = nn_cont (self, struct nn_req, xreq.sockbase);
/* Add the pipe to the underlying raw socket. */
nn_xreq_out (&req->xreq.sockbase, pipe);
/* If the current request was not sent yet, send it now. */
if (req->state == NN_REQ_STATE_UNSENT) {
nn_msg_cp (&msg, &req->request);
rc = nn_xreq_send (&req->xreq.sockbase, &msg);
errnum_assert (rc == 0, -rc);
req->state = NN_REQ_STATE_SENT;
}
}
static void nn_req_timeout (const struct nn_cp_sink **self,
struct nn_timer *timer)
{
int rc;
struct nn_req *req;
struct nn_msg msg;
req = nn_cont (self, struct nn_req, sink);
nn_assert (req->state == NN_REQ_STATE_SENT);
/* Re-send the request. If it cannot be sent, just drop it. */
nn_msg_cp (&msg, &req->request);
rc = nn_xreq_send (&req->xreq.sockbase, &msg);
errnum_assert (rc == 0 || rc == -EAGAIN, -rc);
if (nn_slow (rc == -EAGAIN))
nn_msg_term (&msg);
/* Set up the next re-send timer. */
nn_timer_start (&req->resend_timer, req->resend_ivl);
}