#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <nanomsg/nn.h>
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#include <nanomsg/pubsub.h>
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#include <nanomsg/reqrep.h>
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#define SERVER "server"
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#define CLIENT "client"
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void
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fatal(const char *func)
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{
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fprintf(stderr, "%s: %s\n", func, nn_strerror(nn_errno()));
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}
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char *
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date(void)
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{
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time_t now = time(&now);
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struct tm *info = localtime(&now);
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char *text = asctime(info);
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text[strlen(text)-1] = '\0'; // remove '\n'
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return (text);
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}
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int
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server(const char *url)
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{
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int sock;
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if ((sock = nn_socket(AF_SP, NN_REQ )) < 0) {
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fatal("nn_socket");
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}
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if (nn_bind(sock, url) < 0) {
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fatal("nn_bind");
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}
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for (;;) {
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char *d = date();
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int sz_d = strlen(d) + 1; // '\0' too
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printf("SERVER: PUBLISHING DATE %s\n", d);
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int bytes = nn_send(sock, d, sz_d, 0);
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if (bytes < 0) {
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fatal("nn_send");
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}
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sleep(1);
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}
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}
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int
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client(const char *url, const char *name)
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{
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int sock;
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if ((sock = nn_socket(AF_SP, NN_REP)) < 0) {
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fatal("nn_socket");
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}
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// subscribe to everything ("" means all topics)
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// if (nn_setsockopt(sock, NN_SUB, NN_SUB_SUBSCRIBE, "sjhdfjsdfh", 0) < 0) {
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// fatal("nn_setsockopt");
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// }
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if (nn_connect(sock, url) < 0) {
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fatal("nn_connet");
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}
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for (;;) {
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char *buf = NULL;
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int bytes = nn_recv(sock, &buf, NN_MSG, 0);
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if (bytes < 0) {
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fatal("nn_recv");
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}
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printf("CLIENT (%s): RECEIVED %s\n", name, buf);
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nn_freemsg(buf);
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}
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}
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int
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main(const int argc, const char **argv)
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{
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if ((argc >= 2) && (strcmp(SERVER, argv[1]) == 0))
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return (server(argv[2]));
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if ((argc >= 3) && (strcmp(CLIENT, argv[1]) == 0))
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return (client (argv[2], argv[3]));
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fprintf(stderr, "Usage: pubsub %s|%s <URL> <ARG> ...\n",
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SERVER, CLIENT);
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return 1;
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}
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