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 #define SMALL_SIZE 512
  17 #define SMALL_COUNT 2500
  18 #define LARGE_SIZE 131072
  19
  20 static struct sync_flag accept_flag;
  21
  22 struct client {
  23         meshlink_handle_t *mesh;
  24         meshlink_channel_t *channel;
  25         size_t received;
  26         bool got_large_packet;
  27         struct sync_flag close_flag;
  28 };
  29
  30 static void client_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  31         assert(mesh->priv);
  32         struct client *client = mesh->priv;
  33
  34         if(!data && !len) {
  35                 set_sync_flag(&client->close_flag, true);
  36                 meshlink_channel_close(mesh, channel);
  37                 return;
  38         }
  39
  40         // We expect always the same amount of data from the server.
  41         assert(len == 512 || len == LARGE_SIZE);
  42         client->received += len;
  43
  44         if(len == LARGE_SIZE) {
  45                 client->got_large_packet = true;
  46         }
  47 }
  48
  49 static void status_cb(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
  50         assert(mesh->priv);
  51         struct client *client = mesh->priv;
  52
  53         if(reachable && !strcmp(node->name, "server")) {
  54                 assert(!client->channel);
  55                 client->channel = meshlink_channel_open_ex(mesh, node, 1, client_receive_cb, NULL, 0, MESHLINK_CHANNEL_UDP);
  56                 assert(client->channel);
  57         }
  58 }
  59
  60 static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  61         (void)data;
  62         (void)len;
  63
  64         assert(port == 1);
  65         assert(meshlink_channel_get_flags(mesh, channel) == MESHLINK_CHANNEL_UDP);
  66
  67         assert(mesh->priv);
  68         meshlink_channel_t **c = mesh->priv;
  69
  70         for(int i = 0; i < 3; i++) {
  71                 if(c[i] == NULL) {
  72                         c[i] = channel;
  73
  74                         if(i == 2) {
  75                                 set_sync_flag(&accept_flag, true);
  76                         }
  77
  78                         return true;
  79                 }
  80         }
  81
  82         return false;
  83 }
  84
  85 int main(void) {
  86         init_sync_flag(&accept_flag);
  87
  88         meshlink_set_log_cb(NULL, MESHLINK_WARNING, log_cb);
  89
  90         // Open four new meshlink instance, the server and three peers.
  91
  92         const char *names[3] = {"foo", "bar", "baz"};
  93         struct client clients[3];
  94         meshlink_channel_t *channels[3] = {NULL, NULL, NULL};
  95         memset(clients, 0, sizeof(clients));
  96
  97         assert(meshlink_destroy("channels_udp_conf.0"));
  98         meshlink_handle_t *server = meshlink_open("channels_udp_conf.0", "server", "channels-udp", DEV_CLASS_BACKBONE);
  99         assert(server);
 100         meshlink_enable_discovery(server, false);
 101         server->priv = channels;
 102         meshlink_set_channel_accept_cb(server, accept_cb);
 103         assert(meshlink_start(server));
 104
 105         for(int i = 0; i < 3; i++) {
 106                 char dir[100];
 107                 snprintf(dir, sizeof(dir), "channels_udp_conf.%d", i + 1);
 108                 assert(meshlink_destroy(dir));
 109                 init_sync_flag(&clients[i].close_flag);
 110                 clients[i].mesh = meshlink_open(dir, names[i], "channels-udp", DEV_CLASS_STATIONARY);
 111                 assert(clients[i].mesh);
 112                 clients[i].mesh->priv = &clients[i];
 113                 meshlink_enable_discovery(clients[i].mesh, false);
 114                 link_meshlink_pair(server, clients[i].mesh);
 115                 meshlink_set_node_status_cb(clients[i].mesh, status_cb);
 116                 assert(meshlink_start(clients[i].mesh));
 117         }
 118
 119         // Wait for all three channels to connect
 120
 121         assert(wait_sync_flag(&accept_flag, 10));
 122
 123         for(int i = 0; i < 3; i++) {
 124                 assert(channels[i]);
 125                 assert(clients[i].channel);
 126         }
 127
 128         // Check that we can send up to 65535 bytes without errors
 129
 130         char large_data[LARGE_SIZE] = "";
 131
 132         for(int i = 0; i < 3; i++) {
 133                 assert(meshlink_channel_send(server, channels[i], large_data, sizeof(large_data)) == sizeof(large_data));
 134         }
 135
 136         // Assert that packets larger than 16 MiB are not allowed
 137
 138         assert(meshlink_channel_send(server, channels[0], large_data, 16777216) == -1);
 139
 140         // Stream packets from server to clients for 5 seconds at 40 Mbps (1 kB * 500 Hz)
 141
 142         char data[SMALL_SIZE];
 143         memset(data, 'U', sizeof(data));
 144
 145         for(int j = 0; j < SMALL_COUNT; j++) {
 146                 const struct timespec req = {0, 2000000};
 147                 nanosleep(&req, NULL);
 148
 149                 for(int i = 0; i < 3; i++) {
 150                         assert(meshlink_channel_send(server, channels[i], data, sizeof(data)) == sizeof(data));
 151                 }
 152         }
 153
 154         // Shutdown the write side of the server's channels
 155
 156         for(int i = 0; i < 3; i++) {
 157                 meshlink_channel_shutdown(server, channels[i], SHUT_WR);
 158         }
 159
 160         // Wait for the clients to finish reading all the data
 161
 162         for(int i = 0; i < 3; i++) {
 163                 assert(wait_sync_flag(&clients[i].close_flag, 10));
 164         }
 165
 166         // Check that the clients have received (most of) the data
 167
 168         for(int i = 0; i < 3; i++) {
 169                 fprintf(stderr, "%s received %zu\n", clients[i].mesh->name, clients[i].received);
 170         }
 171
 172         for(int i = 0; i < 3; i++) {
 173                 size_t max_received = SMALL_SIZE * SMALL_COUNT + LARGE_SIZE;
 174                 assert(clients[i].received >= max_received / 2);
 175                 assert(clients[i].received <= max_received);
 176                 assert(clients[i].got_large_packet);
 177         }
 178
 179         // Clean up.
 180
 181         for(int i = 0; i < 3; i++) {
 182                 meshlink_close(clients[i].mesh);
 183         }
 184
 185         meshlink_close(server);
 186
 187         return 0;
 188 }