git.meshlink.io Git - meshlink/blob - test/channels-udp.c

   1 #ifdef NDEBUG
   2 #undef NDEBUG
   3 #endif
   4
   5 #include <assert.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/time.h>
  11 #include <time.h>
  12
  13 #include "../src/meshlink.h"
  14 #include "utils.h"
  15
  16 static struct sync_flag accept_flag;
  17
  18 struct client {
  19         meshlink_handle_t *mesh;
  20         meshlink_channel_t *channel;
  21         size_t received;
  22         bool got_large_packet;
  23         struct sync_flag close_flag;
  24 };
  25
  26 static void client_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  27         assert(mesh->priv);
  28         struct client *client = mesh->priv;
  29
  30         if(!data && !len) {
  31                 set_sync_flag(&client->close_flag, true);
  32                 meshlink_channel_close(mesh, channel);
  33                 return;
  34         }
  35
  36         // We expect always the same amount of data from the server.
  37         assert(len == 512 || len == 65536);
  38         client->received += len;
  39
  40         if(len == 65536) {
  41                 client->got_large_packet = true;
  42         }
  43 }
  44
  45 static void status_cb(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
  46         assert(mesh->priv);
  47         struct client *client = mesh->priv;
  48
  49         if(reachable && !strcmp(node->name, "server")) {
  50                 assert(!client->channel);
  51                 client->channel = meshlink_channel_open_ex(mesh, node, 1, client_receive_cb, NULL, 0, MESHLINK_CHANNEL_UDP);
  52                 assert(client->channel);
  53         }
  54 }
  55
  56 static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  57         (void)data;
  58         (void)len;
  59
  60         assert(port == 1);
  61         assert(meshlink_channel_get_flags(mesh, channel) == MESHLINK_CHANNEL_UDP);
  62
  63         assert(mesh->priv);
  64         meshlink_channel_t **c = mesh->priv;
  65
  66         for(int i = 0; i < 3; i++) {
  67                 if(c[i] == NULL) {
  68                         c[i] = channel;
  69
  70                         if(i == 2) {
  71                                 set_sync_flag(&accept_flag, true);
  72                         }
  73
  74                         return true;
  75                 }
  76         }
  77
  78         return false;
  79 }
  80
  81 int main(void) {
  82         init_sync_flag(&accept_flag);
  83
  84         meshlink_set_log_cb(NULL, MESHLINK_WARNING, log_cb);
  85
  86         // Open four new meshlink instance, the server and three peers.
  87
  88         const char *names[3] = {"foo", "bar", "baz"};
  89         struct client clients[3];
  90         meshlink_channel_t *channels[3] = {NULL, NULL, NULL};
  91         memset(clients, 0, sizeof(clients));
  92
  93         assert(meshlink_destroy("channels_udp_conf.0"));
  94         meshlink_handle_t *server = meshlink_open("channels_udp_conf.0", "server", "channels-udp", DEV_CLASS_BACKBONE);
  95         assert(server);
  96         meshlink_enable_discovery(server, false);
  97         server->priv = channels;
  98         meshlink_set_channel_accept_cb(server, accept_cb);
  99         assert(meshlink_start(server));
 100
 101         for(int i = 0; i < 3; i++) {
 102                 char dir[100];
 103                 snprintf(dir, sizeof(dir), "channels_udp_conf.%d", i + 1);
 104                 assert(meshlink_destroy(dir));
 105                 init_sync_flag(&clients[i].close_flag);
 106                 clients[i].mesh = meshlink_open(dir, names[i], "channels-udp", DEV_CLASS_STATIONARY);
 107                 assert(clients[i].mesh);
 108                 clients[i].mesh->priv = &clients[i];
 109                 meshlink_enable_discovery(clients[i].mesh, false);
 110                 link_meshlink_pair(server, clients[i].mesh);
 111                 meshlink_set_node_status_cb(clients[i].mesh, status_cb);
 112                 assert(meshlink_start(clients[i].mesh));
 113         }
 114
 115         // Wait for all three channels to connect
 116
 117         assert(wait_sync_flag(&accept_flag, 10));
 118
 119         for(int i = 0; i < 3; i++) {
 120                 assert(channels[i]);
 121                 assert(clients[i].channel);
 122         }
 123
 124         // Check that we can send up to 65535 bytes without errors
 125
 126         char large_data[65536] = "";
 127
 128         for(int i = 0; i < 3; i++) {
 129                 assert(meshlink_channel_send(server, channels[i], large_data, sizeof(large_data) + 1) == -1);
 130                 assert(meshlink_channel_send(server, channels[i], large_data, sizeof(large_data)) == sizeof(large_data));
 131         }
 132
 133         // Assert that packets larger than 64 kiB are not allowed
 134
 135         assert(meshlink_channel_send(server, channels[0], large_data, 65537) == -1);
 136
 137         // Stream packets from server to clients for 5 seconds at 40 Mbps (1 kB * 500 Hz)
 138
 139         char data[512];
 140         memset(data, 'U', sizeof(data));
 141
 142         for(int j = 0; j < 2500; j++) {
 143                 for(int i = 0; i < 3; i++) {
 144                         assert(meshlink_channel_send(server, channels[i], data, sizeof(data)) == sizeof(data));
 145                 }
 146
 147                 const struct timespec req = {0, 2000000};
 148                 nanosleep(&req, NULL);
 149         }
 150
 151         // Shutdown the write side of the server's channels
 152
 153         for(int i = 0; i < 3; i++) {
 154                 meshlink_channel_shutdown(server, channels[i], SHUT_WR);
 155         }
 156
 157         // Wait for the clients to finish reading all the data
 158
 159         for(int i = 0; i < 3; i++) {
 160                 assert(wait_sync_flag(&clients[i].close_flag, 10));
 161         }
 162
 163         // Check that the clients have received (most of) the data
 164
 165         for(int i = 0; i < 3; i++) {
 166                 fprintf(stderr, "%s received %zu\n", clients[i].mesh->name, clients[i].received);
 167         }
 168
 169         for(int i = 0; i < 3; i++) {
 170                 assert(clients[i].received >= 1000000);
 171                 assert(clients[i].received <= 1345536);
 172                 assert(clients[i].got_large_packet);
 173         }
 174
 175         // Clean up.
 176
 177         for(int i = 0; i < 3; i++) {
 178                 meshlink_close(clients[i].mesh);
 179         }
 180
 181         meshlink_close(server);
 182
 183         return 0;
 184 }