// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitoar.com>
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//
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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 is just a simple client application for our demo server.
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// It is in a separate file to keep the server code clearer to understand.
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//
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// Our demonstration application layer protocol is simple. The client sends
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// a number of milliseconds to wait before responding. The server just gives
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// back an empty reply after waiting that long.
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// For example:
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//
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// % ./server tcp://127.0.0.1:5555 &
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// % ./client tcp://127.0.0.1:5555 323
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// Request took 324 milliseconds.
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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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#include <time.h>
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#include <nng/nng.h>
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#include <nng/protocol/reqrep0/req.h>
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#include <nng/supplemental/util/platform.h>
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void
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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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/* The client runs just once, and then returns. */
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int
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client(const char *url, const char *msecstr)
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{
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nng_socket sock;
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int rv;
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nng_msg * msg;
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nng_time start;
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nng_time end;
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unsigned msec;
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msec = atoi(msecstr);
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if ((rv = nng_req0_open(&sock)) != 0) {
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fatal("nng_req0_open", rv);
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}
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if ((rv = nng_dial(sock, url, NULL, 0)) != 0) {
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fatal("nng_dial", rv);
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}
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start = nng_clock();
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if ((rv = nng_msg_alloc(&msg, 0)) != 0) {
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fatal("nng_msg_alloc", rv);
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}
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if ((rv = nng_msg_append_u32(msg, msec)) != 0) {
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fatal("nng_msg_append_u32", rv);
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}
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if ((rv = nng_sendmsg(sock, msg, 0)) != 0) {
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fatal("nng_send", rv);
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}
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if ((rv = nng_recvmsg(sock, &msg, 0)) != 0) {
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fatal("nng_recvmsg", rv);
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}
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end = nng_clock();
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nng_msg_free(msg);
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nng_close(sock);
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printf("Request took %u milliseconds.\n", (uint32_t)(end - start));
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return (0);
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}
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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 <url> <secs>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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rc = client(argv[1], argv[2]);
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exit(rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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