109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
// Copyright 2020 Hugo Lindström <hugolm84@gmail.com>
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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// This program serves as an example for how to write async communication with
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// an arbitrary socket using nng_stream. The server receives a connection and
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// sends a hello message to the nng_stream iov.
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// To run this program, start the server as stream -s <portnumber>
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// Then connect to it with the client as stream -c <url>
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//
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// For example:
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//
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// % ./stream -s 5555 &
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// % ./stream -c tcp://127.0.0.1:5555
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#include <nng/nng.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void
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nng_fatal(const char *func, int rv)
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{
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fprintf(stderr, "%s: %s\n", func, nng_strerror(rv));
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exit(1);
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}
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int server(int port);
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int client(const char *url);
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int
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main(int argc, char **argv)
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{
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int rc;
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if (argc < 3) {
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fprintf(stderr, "Usage: %s [-s port|-c url]\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if (strcmp(argv[1], "-s") == 0) {
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rc = server(atoi(argv[2]));
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} else {
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rc = client(argv[2]);
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}
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exit(rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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int
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client(const char *url)
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{
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nng_stream_dialer *dialer;
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nng_aio * aio;
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nng_iov iov;
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int rv;
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// Allocatate dialer and aio assoicated with this connection
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if ((rv = nng_stream_dialer_alloc(&dialer, url)) != 0) {
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nng_fatal("call to nng_stream_dialer_alloc failed", rv);
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}
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if ((rv = nng_aio_alloc(&aio, NULL, NULL)) != 0) {
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nng_fatal("call to nng_aio_alloc", rv);
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}
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nng_aio_set_timeout(aio, 5000); // 5 sec
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// Allocatate a buffer to recv
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iov.iov_len = 100;
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iov.iov_buf = (char *) malloc(sizeof(char) * iov.iov_len);
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if ((rv = nng_aio_set_iov(aio, 1, &iov)) != 0) {
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nng_fatal("call to nng_aio_alloc", rv);
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}
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// Connect to the socket via url provided to alloc
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nng_stream_dialer_dial(dialer, aio);
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// Wait for connection
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nng_aio_wait(aio);
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if ((rv = nng_aio_result(aio)) != 0) {
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nng_fatal("waiting for ng_stream_dialer_dial failed", rv);
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}
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// Get the stream (connection) at position 0
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nng_stream *c1 = (nng_stream *) nng_aio_get_output(aio, 0);
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nng_stream_recv(c1, aio);
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nng_aio_wait(aio);
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if ((rv = nng_aio_result(aio)) != 0) {
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nng_fatal("waiting for nng_stream_recv failed", rv);
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}
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size_t recv_count = nng_aio_count(aio);
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if (recv_count <= 0) {
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nng_fatal("Recv count was 0!", NNG_ECONNABORTED);
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} else {
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printf("received %zu bytes, message: '%s'\n", recv_count,
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(char *) iov.iov_buf);
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}
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// Send ELCOSE to send/recv associated wit this stream
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free(iov.iov_buf);
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nng_stream_free(c1);
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nng_aio_free(aio);
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nng_stream_dialer_free(dialer);
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return 0;
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}
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