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 static struct sync_flag close_flag;
  18
  19 struct client {
  20         meshlink_handle_t *mesh;
  21         meshlink_channel_t *channel;
  22         size_t received;
  23         bool got_large_packet;
  24 };
  25
  26 static void server_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  27         (void)data;
  28
  29         // We expect no data from clients, apart from disconnections.
  30         assert(len == 0);
  31
  32         meshlink_channel_t **c = mesh->priv;
  33         int count = 0;
  34
  35         for(int i = 0; i < 3; i++) {
  36                 if(c[i] == channel) {
  37                         c[i] = NULL;
  38                         meshlink_channel_close(mesh, channel);
  39                 }
  40
  41                 if(c[i]) {
  42                         count++;
  43                 }
  44         }
  45
  46         if(!count) {
  47                 set_sync_flag(&close_flag, true);
  48         }
  49 }
  50
  51 static void client_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  52         (void)channel;
  53         (void)data;
  54
  55         // We expect always the same amount of data from the server.
  56         assert(mesh->priv);
  57         struct client *client = mesh->priv;
  58         assert(len == 512 || len == 65536);
  59         client->received += len;
  60
  61         if(len == 65536) {
  62                 client->got_large_packet = true;
  63         }
  64 }
  65
  66 static void status_cb(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
  67         assert(mesh->priv);
  68         struct client *client = mesh->priv;
  69
  70         if(reachable && !strcmp(node->name, "server")) {
  71                 assert(!client->channel);
  72                 client->channel = meshlink_channel_open_ex(mesh, node, 1, client_receive_cb, NULL, 0, MESHLINK_CHANNEL_UDP);
  73                 assert(client->channel);
  74         }
  75 }
  76
  77 static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  78         (void)data;
  79         (void)len;
  80
  81         assert(port == 1);
  82         assert(meshlink_channel_get_flags(mesh, channel) == MESHLINK_CHANNEL_UDP);
  83         meshlink_set_channel_receive_cb(mesh, channel, server_receive_cb);
  84
  85         assert(mesh->priv);
  86         meshlink_channel_t **c = mesh->priv;
  87
  88         for(int i = 0; i < 3; i++) {
  89                 if(c[i] == NULL) {
  90                         c[i] = channel;
  91
  92                         if(i == 2) {
  93                                 set_sync_flag(&accept_flag, true);
  94                         }
  95
  96                         return true;
  97                 }
  98         }
  99
 100         return false;
 101 }
 102
 103 int main() {
 104         meshlink_set_log_cb(NULL, MESHLINK_WARNING, log_cb);
 105
 106         // Open four new meshlink instance, the server and three peers.
 107
 108         const char *names[3] = {"foo", "bar", "baz"};
 109         struct client clients[3];
 110         meshlink_channel_t *channels[3] = {NULL, NULL, NULL};
 111         memset(clients, 0, sizeof(clients));
 112
 113         assert(meshlink_destroy("channels_udp_conf.0"));
 114         meshlink_handle_t *server = meshlink_open("channels_udp_conf.0", "server", "channels-udp", DEV_CLASS_BACKBONE);
 115         assert(server);
 116         meshlink_enable_discovery(server, false);
 117         server->priv = channels;
 118         meshlink_set_channel_accept_cb(server, accept_cb);
 119         assert(meshlink_start(server));
 120
 121         for(int i = 0; i < 3; i++) {
 122                 char dir[100];
 123                 snprintf(dir, sizeof(dir), "channels_udp_conf.%d", i + 1);
 124                 assert(meshlink_destroy(dir));
 125                 clients[i].mesh = meshlink_open(dir, names[i], "channels-udp", DEV_CLASS_STATIONARY);
 126                 assert(clients[i].mesh);
 127                 clients[i].mesh->priv = &clients[i];
 128                 meshlink_enable_discovery(clients[i].mesh, false);
 129                 link_meshlink_pair(server, clients[i].mesh);
 130                 meshlink_set_node_status_cb(clients[i].mesh, status_cb);
 131                 assert(meshlink_start(clients[i].mesh));
 132         }
 133
 134         // Wait for all three channels to connect
 135
 136         assert(wait_sync_flag(&accept_flag, 10));
 137
 138         for(int i = 0; i < 3; i++) {
 139                 assert(channels[i]);
 140                 assert(clients[i].channel);
 141         }
 142
 143         // Check that we can send up to 65535 bytes without errors
 144
 145         char large_data[65536] = "";
 146
 147         for(int i = 0; i < 3; i++) {
 148                 assert(meshlink_channel_send(server, channels[i], large_data, sizeof(large_data) + 1) == -1);
 149                 assert(meshlink_channel_send(server, channels[i], large_data, sizeof(large_data)) == sizeof(large_data));
 150         }
 151
 152         // Assert that packets larger than 64 kiB are not allowed
 153
 154         assert(meshlink_channel_send(server, channels[0], large_data, 65537) == -1);
 155
 156         // Stream packets from server to clients for 5 seconds at 40 Mbps (1 kB * 500 Hz)
 157
 158         char data[512];
 159         memset(data, 'U', sizeof(data));
 160
 161         for(int j = 0; j < 2500; j++) {
 162                 for(int i = 0; i < 3; i++) {
 163                         assert(meshlink_channel_send(server, channels[i], data, sizeof(data)) == sizeof(data));
 164                 }
 165
 166                 const struct timespec req = {0, 2000000};
 167                 clock_nanosleep(CLOCK_MONOTONIC, 0, &req, NULL);
 168         }
 169
 170         // Let the clients close the channels
 171
 172         for(int i = 0; i < 3; i++) {
 173                 meshlink_channel_close(clients[i].mesh, clients[i].channel);
 174                 meshlink_set_node_status_cb(clients[i].mesh, NULL);
 175         }
 176
 177         assert(wait_sync_flag(&close_flag, 10));
 178
 179         // Check that the clients have received (most of) the data
 180
 181         for(int i = 0; i < 3; i++) {
 182                 fprintf(stderr, "%s received %zu\n", clients[i].mesh->name, clients[i].received);
 183         }
 184
 185         for(int i = 0; i < 3; i++) {
 186                 assert(clients[i].received >= 1000000);
 187                 assert(clients[i].received <= 1345536);
 188                 assert(clients[i].got_large_packet);
 189         }
 190
 191         // Clean up.
 192
 193         for(int i = 0; i < 3; i++) {
 194                 meshlink_close(clients[i].mesh);
 195         }
 196
 197         meshlink_close(server);
 198
 199         return 0;
 200 }