mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-27 18:50:48 +00:00
webrtc: implement support for asynchronous host resolution
Doesn't block anymore if a mdns host resolution takes multiple seconds to complete in e.g. stun/turn/ice candidate usage. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1961>
This commit is contained in:
Matthew Waters
GStreamer Marge Bot
parent
dd4bbb6379
commit
6066e913ee
1 changed files with 280 additions and 87 deletions
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@ -282,56 +282,165 @@ _parse_userinfo (const gchar * userinfo, gchar ** user, gchar ** pass)
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*pass = g_uri_unescape_string (&colon[1], NULL);
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}
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static gchar *
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_resolve_host (GstWebRTCICE * ice, const gchar * host)
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struct resolve_host_data
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{
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GResolver *resolver = g_resolver_get_default ();
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GstWebRTCICE *ice;
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char *host;
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gboolean main_context_handled;
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gpointer user_data;
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GDestroyNotify notify;
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};
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static void
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on_resolve_host (GResolver * resolver, GAsyncResult * res, gpointer user_data)
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{
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GTask *task = user_data;
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struct resolve_host_data *rh;
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GError *error = NULL;
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GInetAddress *addr;
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GList *addresses;
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gchar *address;
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GST_DEBUG_OBJECT (ice, "Resolving host %s", host);
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rh = g_task_get_task_data (task);
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if (!(addresses = g_resolver_lookup_by_name (resolver, host, NULL, &error))) {
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GST_ERROR ("%s", error->message);
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g_clear_error (&error);
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return NULL;
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if (!(addresses = g_resolver_lookup_by_name_finish (resolver, res, &error))) {
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GST_ERROR ("failed to resolve: %s", error->message);
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g_task_return_error (task, error);
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g_object_unref (task);
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return;
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}
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GST_DEBUG_OBJECT (ice, "Resolved %d addresses for host %s",
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g_list_length (addresses), host);
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GST_DEBUG_OBJECT (rh->ice, "Resolved %d addresses for host %s with data %p",
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g_list_length (addresses), rh->host, rh);
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/* XXX: only the first address is used */
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addr = addresses->data;
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address = g_inet_address_to_string (addr);
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g_resolver_free_addresses (addresses);
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return address;
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g_task_return_pointer (task, addresses,
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(GDestroyNotify) g_resolver_free_addresses);
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g_object_unref (task);
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}
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static void
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_add_turn_server (GstWebRTCICE * ice, struct NiceStreamItem *item,
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GstUri * turn_server)
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free_resolve_host_data (struct resolve_host_data *rh)
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{
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GST_TRACE_OBJECT (rh->ice, "Freeing data %p for resolving host %s", rh,
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rh->host);
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if (rh->notify)
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rh->notify (rh->user_data);
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g_free (rh->host);
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g_free (rh);
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}
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static struct resolve_host_data *
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resolve_host_data_new (GstWebRTCICE * ice, const char *host)
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{
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struct resolve_host_data *rh = g_new0 (struct resolve_host_data, 1);
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rh->ice = ice;
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rh->host = g_strdup (host);
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return rh;
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}
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static gboolean
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resolve_host_main_cb (gpointer user_data)
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{
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GResolver *resolver = g_resolver_get_default ();
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GTask *task = user_data;
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struct resolve_host_data *rh;
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rh = g_task_get_task_data (task);
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/* no need to error anymore if the main context disappears and this task is
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* not run */
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rh->main_context_handled = TRUE;
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GST_DEBUG_OBJECT (rh->ice, "Resolving host %s", rh->host);
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g_resolver_lookup_by_name_async (resolver, rh->host, NULL,
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(GAsyncReadyCallback) on_resolve_host, g_object_ref (task));
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return G_SOURCE_REMOVE;
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}
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static void
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error_task_if_unhandled (GTask * task)
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{
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struct resolve_host_data *rh;
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rh = g_task_get_task_data (task);
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if (!rh->main_context_handled) {
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GST_DEBUG_OBJECT (rh->ice, "host resolve for %s with data %p was never "
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"executed, main context quit?", rh->host, rh);
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g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_CANCELLED, "%s",
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"Cancelled");
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}
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g_object_unref (task);
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}
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static void
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resolve_host_async (GstWebRTCICE * ice, const gchar * host,
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GAsyncReadyCallback cb, gpointer user_data, GDestroyNotify notify)
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{
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struct resolve_host_data *rh = resolve_host_data_new (ice, host);
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GTask *task;
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rh->user_data = user_data;
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rh->notify = notify;
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task = g_task_new (rh->ice, NULL, cb, user_data);
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g_task_set_task_data (task, rh, (GDestroyNotify) free_resolve_host_data);
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GST_TRACE_OBJECT (rh->ice, "invoking main context for resolving host %s "
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"with data %p", host, rh);
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g_main_context_invoke_full (ice->priv->main_context, G_PRIORITY_DEFAULT,
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resolve_host_main_cb, task, (GDestroyNotify) error_task_if_unhandled);
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}
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static GList *
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resolve_host_finish (GstWebRTCICE * ice, GAsyncResult * res, GError ** error)
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{
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g_return_val_if_fail (g_task_is_valid (res, ice), NULL);
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return g_task_propagate_pointer (G_TASK (res), error);
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}
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struct turn_server_data
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{
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GstUri *uri;
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guint nice_stream_id;
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};
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static void
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turn_server_data_free (struct turn_server_data *data)
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{
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gst_uri_unref (data->uri);
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g_free (data);
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}
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static void
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on_turn_server_resolved (GstWebRTCICE * ice, GAsyncResult * res,
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struct turn_server_data *user_data)
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{
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GList *addresses;
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GError *error = NULL;
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GstUri *turn_server = user_data->uri;
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gboolean ret;
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gchar *user, *pass;
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const gchar *host, *userinfo, *transport, *scheme;
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const gchar *userinfo, *transport, *scheme;
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NiceRelayType relays[4] = { 0, };
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int i, relay_n = 0;
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gchar *ip = NULL;
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host = gst_uri_get_host (turn_server);
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if (!host) {
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GST_ERROR_OBJECT (ice, "Turn server has no host");
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goto out;
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}
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ip = _resolve_host (ice, host);
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if (!ip) {
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GST_ERROR_OBJECT (ice, "Failed to resolve turn server '%s'", host);
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goto out;
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if (!(addresses = resolve_host_finish (ice, res, &error))) {
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GST_WARNING_OBJECT (ice, "failed to resolve turn address: %s",
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error->message);
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g_clear_error (&error);
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return;
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}
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/* XXX: only the first IP is used */
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ip = g_inet_address_to_string (addresses->data);
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/* Set the resolved IP as the host since that's what libnice wants */
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gst_uri_set_host (turn_server, ip);
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@ -352,7 +461,7 @@ _add_turn_server (GstWebRTCICE * ice, struct NiceStreamItem *item,
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for (i = 0; i < relay_n; i++) {
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ret = nice_agent_set_relay_info (ice->priv->nice_agent,
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item->nice_stream_id, NICE_COMPONENT_TYPE_RTP,
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user_data->nice_stream_id, NICE_COMPONENT_TYPE_RTP,
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gst_uri_get_host (turn_server), gst_uri_get_port (turn_server),
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user, pass, relays[i]);
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if (!ret) {
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@ -365,10 +474,30 @@ _add_turn_server (GstWebRTCICE * ice, struct NiceStreamItem *item,
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g_free (user);
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g_free (pass);
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out:
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g_free (ip);
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}
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static void
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_add_turn_server (GstWebRTCICE * ice, struct NiceStreamItem *item,
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GstUri * turn_server)
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{
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struct turn_server_data *data;
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const gchar *host;
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host = gst_uri_get_host (turn_server);
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if (!host) {
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GST_ERROR_OBJECT (ice, "Turn server has no host");
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return;
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}
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data = g_new0 (struct turn_server_data, 1);
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data->nice_stream_id = item->nice_stream_id;
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data->uri = gst_uri_copy (turn_server);
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resolve_host_async (ice, host, (GAsyncReadyCallback) on_turn_server_resolved,
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data, (GDestroyNotify) turn_server_data_free);
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}
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typedef struct
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{
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GstWebRTCICE *ice;
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@ -382,13 +511,37 @@ _add_turn_server_func (const gchar * uri, GstUri * turn_server,
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_add_turn_server (data->ice, data->item, turn_server);
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}
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static void
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on_stun_server_resolved (GstWebRTCICE * ice, GAsyncResult * res,
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gpointer user_data)
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{
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GList *addresses;
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GError *error = NULL;
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guint port = GPOINTER_TO_UINT (user_data);
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char *ip;
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if (!(addresses = resolve_host_finish (ice, res, &error))) {
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GST_WARNING_OBJECT (ice, "Failed to resolve stun server: %s",
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error->message);
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g_clear_error (&error);
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return;
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}
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/* XXX: only the first IP is used */
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ip = g_inet_address_to_string (addresses->data);
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g_object_set (ice->priv->nice_agent, "stun-server", ip,
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"stun-server-port", port, NULL);
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g_free (ip);
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}
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static void
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_add_stun_server (GstWebRTCICE * ice, GstUri * stun_server)
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{
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const gchar *msg = "must be of the form stun://<host>:<port>";
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const gchar *host;
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gchar *s = NULL;
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gchar *ip = NULL;
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guint port;
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s = gst_uri_to_string (stun_server);
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@ -407,18 +560,11 @@ _add_stun_server (GstWebRTCICE * ice, GstUri * stun_server)
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gst_uri_set_port (stun_server, port);
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}
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ip = _resolve_host (ice, host);
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if (!ip) {
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GST_ERROR_OBJECT (ice, "Failed to resolve stun server '%s'", host);
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goto out;
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}
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g_object_set (ice->priv->nice_agent, "stun-server", ip,
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"stun-server-port", port, NULL);
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resolve_host_async (ice, host, (GAsyncReadyCallback) on_stun_server_resolved,
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GUINT_TO_POINTER (port), NULL);
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out:
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g_free (s);
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g_free (ip);
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}
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GstWebRTCICEStream *
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@ -623,6 +769,84 @@ failure:
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return FALSE;
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}
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struct resolve_candidate_data
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{
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guint nice_stream_id;
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char *prefix;
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char *postfix;
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};
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static void
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free_resolve_candidate_data (struct resolve_candidate_data *rc)
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{
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g_free (rc->prefix);
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g_free (rc->postfix);
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g_free (rc);
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}
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static void
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add_ice_candidate_to_libnice (GstWebRTCICE * ice, guint nice_stream_id,
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NiceCandidate * cand)
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{
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GSList *candidates = NULL;
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if (cand->component_id == 2) {
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/* we only support rtcp-mux so rtcp candidates are useless for us */
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GST_INFO_OBJECT (ice, "Dropping RTCP candidate");
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return;
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}
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candidates = g_slist_append (candidates, cand);
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nice_agent_set_remote_candidates (ice->priv->nice_agent, nice_stream_id,
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cand->component_id, candidates);
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g_slist_free (candidates);
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}
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static void
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on_candidate_resolved (GstWebRTCICE * ice, GAsyncResult * res,
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gpointer user_data)
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{
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struct resolve_candidate_data *rc = user_data;
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GError *error = NULL;
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GList *addresses;
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char *new_candv[4] = { NULL, };
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char *new_addr, *new_candidate;
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NiceCandidate *cand;
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if (!(addresses = resolve_host_finish (ice, res, &error))) {
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GST_WARNING_OBJECT (ice, "Could not resolve candidate address: %s",
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error->message);
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g_clear_error (&error);
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return;
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}
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new_addr = g_inet_address_to_string (addresses->data);
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new_candv[0] = rc->prefix;
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new_candv[1] = new_addr;
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new_candv[2] = rc->postfix;
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new_candv[3] = NULL;
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new_candidate = g_strjoinv (" ", new_candv);
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GST_DEBUG_OBJECT (ice, "resolved to candidate %s", new_candidate);
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cand =
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nice_agent_parse_remote_candidate_sdp (ice->priv->nice_agent,
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rc->nice_stream_id, new_candidate);
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g_free (new_candidate);
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if (!cand) {
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GST_WARNING_OBJECT (ice, "Could not parse candidate \'%s\'", new_candidate);
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return;
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}
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g_free (new_addr);
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add_ice_candidate_to_libnice (ice, rc->nice_stream_id, cand);
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nice_candidate_free (cand);
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}
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/* candidate must start with "a=candidate:" or be NULL*/
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void
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gst_webrtc_ice_add_candidate (GstWebRTCICE * ice, GstWebRTCICEStream * stream,
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@ -630,7 +854,6 @@ gst_webrtc_ice_add_candidate (GstWebRTCICE * ice, GstWebRTCICEStream * stream,
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{
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struct NiceStreamItem *item;
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NiceCandidate *cand;
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GSList *candidates = NULL;
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item = _find_item (ice, -1, -1, stream);
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g_return_if_fail (item != NULL);
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@ -647,9 +870,7 @@ gst_webrtc_ice_add_candidate (GstWebRTCICE * ice, GstWebRTCICEStream * stream,
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if (!cand) {
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/* might be a .local candidate */
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char *prefix = NULL, *address = NULL, *postfix = NULL;
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char *new_addr = NULL, *new_candidate = NULL;
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char *new_candv[4] = { NULL, };
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gboolean failure = TRUE;
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struct resolve_candidate_data *rc;
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if (!get_candidate_address (candidate, &prefix, &address, &postfix)) {
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GST_WARNING_OBJECT (ice, "Failed to retrieve address from candidate %s",
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@ -663,54 +884,26 @@ gst_webrtc_ice_add_candidate (GstWebRTCICE * ice, GstWebRTCICEStream * stream,
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goto done;
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}
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/* FIXME: async */
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if (!(new_addr = _resolve_host (ice, address))) {
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GST_WARNING_OBJECT (ice, "Failed to resolve %s", address);
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goto done;
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}
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rc = g_new0 (struct resolve_candidate_data, 1);
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rc->nice_stream_id = item->nice_stream_id;
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rc->prefix = prefix;
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rc->postfix = postfix;
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resolve_host_async (ice, address,
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(GAsyncReadyCallback) on_candidate_resolved, rc,
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(GDestroyNotify) free_resolve_candidate_data);
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new_candv[0] = prefix;
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new_candv[1] = new_addr;
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new_candv[2] = postfix;
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new_candv[3] = NULL;
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new_candidate = g_strjoinv (" ", new_candv);
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GST_DEBUG_OBJECT (ice, "resolved to candidate %s", new_candidate);
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cand =
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nice_agent_parse_remote_candidate_sdp (ice->priv->nice_agent,
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item->nice_stream_id, new_candidate);
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if (!cand) {
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GST_WARNING_OBJECT (ice, "Could not parse candidate \'%s\'",
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new_candidate);
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goto done;
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}
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failure = FALSE;
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prefix = NULL;
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postfix = NULL;
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done:
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g_free (prefix);
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g_free (address);
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g_free (postfix);
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g_free (new_addr);
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g_free (new_candidate);
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if (failure)
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return;
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}
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g_clear_pointer (&address, g_free);
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g_clear_pointer (&prefix, g_free);
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g_clear_pointer (&postfix, g_free);
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if (cand->component_id == 2) {
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/* we only support rtcp-mux so rtcp candidates are useless for us */
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GST_INFO_OBJECT (ice, "Dropping RTCP candidate %s", candidate);
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nice_candidate_free (cand);
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return;
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}
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||||
|
||||
candidates = g_slist_append (candidates, cand);
|
||||
|
||||
nice_agent_set_remote_candidates (ice->priv->nice_agent, item->nice_stream_id,
|
||||
cand->component_id, candidates);
|
||||
|
||||
g_slist_free (candidates);
|
||||
add_ice_candidate_to_libnice (ice, item->nice_stream_id, cand);
|
||||
nice_candidate_free (cand);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue