Ensure the poll callback is called when a UDP channel has finished connecting.

[meshlink] / test / channels-udp-cornercases.c

diff --git a/test/channels-udp-cornercases.c b/test/channels-udp-cornercases.c
new file mode 100644 (file)
index 0000000..d70a6cd
--- /dev/null
+++ b/test/channels-udp-cornercases.c
@@ -0,0 +1,175 @@
+#define _GNU_SOURCE
+
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <assert.h>
+#include <pthread.h>
+
+#include "../src/meshlink.h"
+#include "utils.h"
+
+static struct sync_flag b_responded;
+static struct sync_flag b_closed;
+static size_t a_poll_cb_len;
+
+static void a_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
+       (void)mesh;
+       (void)channel;
+
+       if(len == 5 && !memcmp(data, "Hello", 5)) {
+               set_sync_flag(&b_responded, true);
+       } else if(len == 0) {
+               set_sync_flag(&b_closed, true);
+               set_sync_flag(channel->priv, true);
+       }
+}
+
+static void b_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
+       // Send one message back, then close the channel.
+       if(len) {
+               assert(meshlink_channel_send(mesh, channel, data, len) == (ssize_t)len);
+       }
+
+       meshlink_channel_close(mesh, channel);
+}
+
+static bool reject_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
+       (void)mesh;
+       (void)channel;
+       (void)port;
+       (void)data;
+       (void)len;
+
+       return false;
+}
+
+static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
+       (void)port;
+
+       meshlink_set_channel_accept_cb(mesh, NULL);
+       meshlink_set_channel_receive_cb(mesh, channel, b_receive_cb);
+
+       if(data) {
+               b_receive_cb(mesh, channel, data, len);
+       }
+
+       return true;
+}
+
+static void poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
+       (void)len;
+
+       meshlink_set_channel_poll_cb(mesh, channel, NULL);
+       set_sync_flag(channel->priv, true);
+}
+
+static void poll_cb2(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
+       (void)mesh;
+       (void)channel;
+
+       a_poll_cb_len = len;
+       meshlink_set_channel_poll_cb(mesh, channel, NULL);
+       set_sync_flag(channel->priv, true);
+}
+
+int main(void) {
+       meshlink_set_log_cb(NULL, MESHLINK_DEBUG, log_cb);
+       init_sync_flag(&b_responded);
+       init_sync_flag(&b_closed);
+
+       meshlink_handle_t *a, *b;
+       open_meshlink_pair(&a, &b, "channels-udp-cornercases");
+
+       // Set the callbacks.
+
+       meshlink_set_channel_accept_cb(a, reject_cb);
+       meshlink_set_channel_accept_cb(b, accept_cb);
+
+       // Open a channel from a to b before starting the mesh.
+
+       meshlink_node_t *nb = meshlink_get_node(a, "b");
+       assert(nb);
+
+       struct sync_flag channel_opened;
+       init_sync_flag(&channel_opened);
+
+       meshlink_channel_t *channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
+       assert(channel);
+
+       meshlink_set_channel_poll_cb(a, channel, poll_cb);
+
+       // Check that the channel isn't established yet and sending a packet at this point returns 0
+       assert(meshlink_channel_send(a, channel, "test", 4) == 0);
+       assert(wait_sync_flag(&channel_opened, 1) == false);
+
+       // Start MeshLink and wait for the channel to become connected.
+       start_meshlink_pair(a, b);
+
+       assert(wait_sync_flag(&channel_opened, 5));
+
+       // Re-initialize everything
+       meshlink_channel_close(a, channel);
+       close_meshlink_pair(a, b);
+       reset_sync_flag(&channel_opened);
+       reset_sync_flag(&b_responded);
+       reset_sync_flag(&b_closed);
+       open_meshlink_pair(&a, &b, "channels-udp-cornercases");
+
+       meshlink_set_channel_accept_cb(a, reject_cb);
+       meshlink_set_channel_accept_cb(b, accept_cb);
+
+       start_meshlink_pair(a, b);
+
+       // Create a channel to b
+       nb = meshlink_get_node(a, "b");
+       assert(nb);
+
+       channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
+       assert(channel);
+       meshlink_set_channel_poll_cb(a, channel, poll_cb);
+
+       assert(wait_sync_flag(&channel_opened, 5));
+
+       // Send a message to b
+
+       struct sync_flag channel_closed;
+       init_sync_flag(&channel_closed);
+       channel->priv = &channel_closed;
+
+       for(int i = 0; i < 10; i++) {
+               assert(meshlink_channel_send(a, channel, "Hello", 5) == 5);
+
+               if(wait_sync_flag(&channel_closed, 1)) {
+                       break;
+               }
+       }
+
+       assert(wait_sync_flag(&channel_closed, 1));
+
+       wait_sync_flag(&b_responded, 1);
+       wait_sync_flag(&b_closed, 1);
+
+       // Try to create a second channel
+
+       struct sync_flag channel_polled;
+       init_sync_flag(&channel_polled);
+
+       meshlink_channel_t *channel2 = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_polled, 0, MESHLINK_CHANNEL_UDP);
+       assert(channel2);
+       meshlink_set_channel_poll_cb(a, channel2, poll_cb2);
+
+       assert(wait_sync_flag(&channel_polled, 5));
+
+       assert(0 == a_poll_cb_len);
+
+       meshlink_channel_close(a, channel);
+       meshlink_channel_close(a, channel2);
+       close_meshlink_pair(a, b);
+}