| | |
| | | #include <stdlib.h> |
| | | // |
| | | // Copyright 2018 Staysail Systems, Inc. <info@staysail.tech> |
| | | // Copyright 2018 Capitar IT Group BV <info@capitar.com> |
| | | // |
| | | // This software is supplied under the terms of the MIT License, a |
| | | // copy of which should be located in the distribution where this |
| | | // file was obtained (LICENSE.txt). A copy of the license may also be |
| | | // found online at https://opensource.org/licenses/MIT. |
| | | // |
| | | |
| | | // |
| | | // This is just a simple REQ/REP demonstration application. It is derived |
| | | // from the legacy nanomsg demonstration program of the same name, written |
| | | // by Tim Dysinger, but updated for nng. I've also updated it to pass simpler |
| | | // binary data rather than strings over the network. |
| | | // |
| | | // The program implements a simple RPC style service, which just returns |
| | | // the date in UNIX time (seconds since 1970). |
| | | // |
| | | #include <stdint.h> |
| | | #include <stdio.h> |
| | | #include <stdlib.h> |
| | | #include <string.h> |
| | | #include <time.h> |
| | | #include <nanomsg/nn.h> |
| | | #include <nanomsg/reqrep.h> |
| | | |
| | | #define NODE0 "node0" |
| | | #define NODE1 "node1" |
| | | #define DATE "DATE" |
| | | #include <nng/nng.h> |
| | | #include <nng/protocol/reqrep0/rep.h> |
| | | #include <nng/protocol/reqrep0/req.h> |
| | | |
| | | #define CLIENT "client" |
| | | #define SERVER "server" |
| | | #define DATECMD 1 |
| | | |
| | | #define PUT64(ptr, u) \ |
| | | do { \ |
| | | (ptr)[0] = (uint8_t)(((uint64_t)(u)) >> 56); \ |
| | | (ptr)[1] = (uint8_t)(((uint64_t)(u)) >> 48); \ |
| | | (ptr)[2] = (uint8_t)(((uint64_t)(u)) >> 40); \ |
| | | (ptr)[3] = (uint8_t)(((uint64_t)(u)) >> 32); \ |
| | | (ptr)[4] = (uint8_t)(((uint64_t)(u)) >> 24); \ |
| | | (ptr)[5] = (uint8_t)(((uint64_t)(u)) >> 16); \ |
| | | (ptr)[6] = (uint8_t)(((uint64_t)(u)) >> 8); \ |
| | | (ptr)[7] = (uint8_t)((uint64_t)(u)); \ |
| | | } while (0) |
| | | |
| | | #define GET64(ptr, v) \ |
| | | v = (((uint64_t)((uint8_t)(ptr)[0])) << 56) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[1])) << 48) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[2])) << 40) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[3])) << 32) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[4])) << 24) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[5])) << 16) + \ |
| | | (((uint64_t)((uint8_t)(ptr)[6])) << 8) + \ |
| | | (((uint64_t)(uint8_t)(ptr)[7])) |
| | | |
| | | void |
| | | fatal(const char *func) |
| | | fatal(const char *func, int rv) |
| | | { |
| | | fprintf(stderr, "%s: %s\n", func, nn_strerror(nn_errno())); |
| | | exit(1); |
| | | fprintf(stderr, "%s: %s\n", func, nng_strerror(rv)); |
| | | exit(1); |
| | | } |
| | | |
| | | char * |
| | | date(void) |
| | | void |
| | | showdate(time_t now) |
| | | { |
| | | time_t now = time(&now); |
| | | struct tm *info = localtime(&now); |
| | | char *text = asctime(info); |
| | | text[strlen(text)-1] = '\0'; // remove '\n' |
| | | return (text); |
| | | struct tm *info = localtime(&now); |
| | | printf("%s", asctime(info)); |
| | | } |
| | | |
| | | int |
| | | node0(const char *url) |
| | | server(const char *url) |
| | | { |
| | | int sz_date = strlen(DATE) + 1; // '\0' too |
| | | int sock; |
| | | int rv; |
| | | nng_socket 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); |
| | | } |
| | | 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); |
| | | } |
| | | for (;;) { |
| | | char * buf = NULL; |
| | | size_t sz; |
| | | uint64_t val; |
| | | if ((rv = nng_recv(sock, &buf, &sz, NNG_FLAG_ALLOC)) != 0) { |
| | | fatal("nng_recv", rv); |
| | | } |
| | | if ((sz == sizeof(uint64_t)) && |
| | | ((GET64(buf, val)) == DATECMD)) { |
| | | time_t now; |
| | | printf("SERVER: RECEIVED DATE REQUEST\n"); |
| | | now = time(&now); |
| | | printf("SERVER: SENDING DATE: "); |
| | | showdate(now); |
| | | |
| | | // Reuse the buffer. We know it is big enough. |
| | | PUT64(buf, (uint64_t) now); |
| | | rv = nng_send(sock, buf, sz, NNG_FLAG_ALLOC); |
| | | if (rv != 0) { |
| | | fatal("nng_send", rv); |
| | | } |
| | | continue; |
| | | } |
| | | // Unrecognized command, so toss the buffer. |
| | | nng_free(buf, sz); |
| | | } |
| | | } |
| | | |
| | | int |
| | | node1(const char *url) |
| | | client(const char *url) |
| | | { |
| | | int sz_date = strlen(DATE) + 1; // '\0' too |
| | | char *buf = NULL; |
| | | int bytes = -1; |
| | | int sock; |
| | | int rv; |
| | | nng_socket sock; |
| | | int rv; |
| | | size_t sz; |
| | | char * buf = NULL; |
| | | uint8_t cmd[sizeof(uint64_t)]; |
| | | |
| | | 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); |
| | | nn_freemsg(buf); |
| | | return (nn_shutdown(sock, 0)); |
| | | PUT64(cmd, DATECMD); |
| | | |
| | | if ((rv = nng_req0_open(&sock)) != 0) { |
| | | fatal("nng_socket", rv); |
| | | } |
| | | if ((rv = nng_dial(sock, url, NULL, 0)) != 0) { |
| | | fatal("nng_dial", rv); |
| | | } |
| | | printf("CLIENT: SENDING DATE REQUEST\n"); |
| | | if ((rv = nng_send(sock, cmd, sizeof(cmd), 0)) != 0) { |
| | | fatal("nng_send", rv); |
| | | } |
| | | if ((rv = nng_recv(sock, &buf, &sz, NNG_FLAG_ALLOC)) != 0) { |
| | | fatal("nng_recv", rv); |
| | | } |
| | | |
| | | if (sz == sizeof(uint64_t)) { |
| | | uint64_t now; |
| | | GET64(buf, now); |
| | | printf("CLIENT: RECEIVED DATE: "); |
| | | showdate((time_t) now); |
| | | } else { |
| | | printf("CLIENT: GOT WRONG SIZE!\n"); |
| | | } |
| | | |
| | | // This assumes that buf is ASCIIZ (zero terminated). |
| | | nng_free(buf, sz); |
| | | nng_close(sock); |
| | | return (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(CLIENT, argv[1]) == 0)) |
| | | return (client(argv[2])); |
| | | |
| | | if ((argc > 1) && (strcmp(NODE1, argv[1]) == 0)) |
| | | return (node1(argv[2])); |
| | | if ((argc > 1) && (strcmp(SERVER, argv[1]) == 0)) |
| | | return (server(argv[2])); |
| | | |
| | | fprintf(stderr, "Usage: reqrep %s|%s <URL> ...\n", NODE0, NODE1); |
| | | return (1); |
| | | fprintf(stderr, "Usage: reqrep %s|%s <URL> ...\n", CLIENT, SERVER); |
| | | return (1); |
| | | } |
| | | |
| | | /* |
| | | |
| | | ./reqrep node0 ipc:///tmp/reqrep.ipc & node0=$! && sleep 1 |
| | | ./reqrep node1 ipc:///tmp/reqrep.ipc |
| | | kill $node0 |
| | | */ |