#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>

#include <nng/nng.h>
#include <nng/protocol/reqrep0/rep.h>
#include <nng/protocol/reqrep0/req.h>

#define NODE0 "node0"
#define NODE1 "node1"
#define DATE "DATE"

void
fatal(const char *func, int rv)
{
        fprintf(stderr, "%s: %s\n", func, nng_strerror(rv));
        exit(1);
}

char *
date(void)
{
        time_t now = time(&now);
        struct tm *info = localtime(&now);
        char *text = asctime(info);
        text[strlen(text)-1] = '\0'; // remove '\n'
        return (text);
}

int
server(const char *url)
{
        nng_socket sock;
        int rv;

        if ((rv = nng_rep0_open(&sock)) != 0) {
                fatal("nng_rep0_open", rv);
        }
          if ((rv = nng_listen(sock, url, NULL, 0)) != 0) {
                fatal("nng_listen", rv);
        }
        char sendbuf[512];
        for (;;) {
            char *buf = NULL;
            size_t sz;
            if ((rv = nng_recv(sock, &buf, &sz, NNG_FLAG_ALLOC)) != 0) {
                    fatal("nng_recv", rv);
            }


            printf("NODE0: RECEIVED:%s\n", buf);
            char *d = date();
            sprintf(sendbuf, "%s: %s", d, buf);
            printf("NODE0: SENDING DATE %s\n", d);
            if ((rv = nng_send(sock, sendbuf, strlen(sendbuf) + 1, 0)) != 0) {
                fatal("nng_send", rv);
            }
            nng_free(buf, sz);
        }
}

 

int
main(const int argc, const char **argv)
{
         
    char *url = "ipc:///tmp/reqrep.ipc";
    server(url);
}