| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <time.h> |
| #include <nanomsg/nn.h> |
| #include <nanomsg/reqrep.h> |
| |
| #define NODE0 "node0" |
| #define NODE1 "node1" |
| #define DATE "DATE" |
| |
| void |
| fatal(const char *func) |
| { |
| fprintf(stderr, "%s: %s\n", func, nn_strerror(nn_errno())); |
| 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 |
| node0(const char *url) |
| { |
| int sz_date = strlen(DATE) + 1; // '\0' too |
| int sock; |
| int rv; |
| |
| if ((sock = nn_socket(AF_SP, NN_REP)) < 0) { |
| fatal("nn_socket"); |
| } |
| if ((rv = nn_bind(sock, url)) < 0) { |
| fatal("nn_bind"); |
| } |
| for (;;) { |
| char *buf = NULL; |
| int bytes; |
| if ((bytes = nn_recv(sock, &buf, NN_MSG, 0)) < 0) { |
| fatal("nn_recv"); |
| } |
| if ((bytes == (strlen(DATE) + 1)) && (strcmp(DATE, buf) == 0)) { |
| printf("NODE0: RECEIVED DATE REQUEST\n"); |
| char *d = date(); |
| int sz_d = strlen(d) + 1; // '\0' too |
| printf("NODE0: SENDING DATE %s\n", d); |
| if ((bytes = nn_send(sock, d, sz_d, 0)) < 0) { |
| fatal("nn_send"); |
| } |
| } |
| nn_freemsg(buf); |
| } |
| } |
| |
| int |
| node1(const char *url) |
| { |
| int sz_date = strlen(DATE) + 1; // '\0' too |
| char *buf = NULL; |
| int bytes = -1; |
| int sock; |
| int rv; |
| |
| if ((sock = nn_socket(AF_SP, NN_REQ)) < 0) { |
| fatal("nn_socket"); |
| } |
| if ((rv = nn_connect (sock, url)) < 0) { |
| fatal("nn_connect"); |
| } |
| printf("NODE1: SENDING DATE REQUEST %s\n", DATE); |
| if ((bytes = nn_send(sock, DATE, sz_date, 0)) < 0) { |
| fatal("nn_send"); |
| } |
| if ((bytes = nn_recv(sock, &buf, NN_MSG, 0)) < 0) { |
| fatal("nn_recv"); |
| } |
| printf("NODE1: RECEIVED DATE %s\n", buf); // <1> |
| nn_freemsg(buf); |
| return (nn_shutdown(sock, 0)); |
| } |
| |
| int |
| main(const int argc, const char **argv) |
| { |
| if ((argc > 1) && (strcmp(NODE0, argv[1]) == 0)) |
| return (node0(argv[2])); |
| |
| if ((argc > 1) && (strcmp(NODE1, argv[1]) == 0)) |
| return (node1(argv[2])); |
| |
| fprintf(stderr, "Usage: reqrep %s|%s <URL> ...\n", NODE0, NODE1); |
| return (1); |
| } |
| |