tcp: Convert tcpclientsrc to new helpers.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1105>

gst/tcp/gsttcpclientsrc.c

@@ -408,58 +408,50 @@ gst_tcp_client_src_start (GstBaseSrc * bsrc)
 {
   GstTCPClientSrc *src = GST_TCP_CLIENT_SRC (bsrc);
   GError *err = NULL;
-  GInetAddress *addr;
+  GList *addrs;
+  GList *cur_addr;
   GSocketAddress *saddr;
-  GResolver *resolver;
 
   src->bytes_received = 0;
   gst_clear_structure (&src->stats);
 
-  /* look up name if we need to */
-  addr = g_inet_address_new_from_string (src->host);
-  if (!addr) {
-    GList *results;
-
-    resolver = g_resolver_get_default ();
-
-    results =
-        g_resolver_lookup_by_name (resolver, src->host, src->cancellable, &err);
-    if (!results)
+  addrs =
+      tcp_get_addresses (GST_ELEMENT (src), src->host, src->cancellable, &err);
+  if (!addrs)
     goto name_resolve;
-    addr = G_INET_ADDRESS (g_object_ref (results->data));
-
-    g_resolver_free_addresses (results);
-    g_object_unref (resolver);
-  }
-#ifndef GST_DISABLE_GST_DEBUG
-  {
-    gchar *ip = g_inet_address_to_string (addr);
-
-    GST_DEBUG_OBJECT (src, "IP address for host %s is %s", src->host, ip);
-    g_free (ip);
-  }
-#endif
 
-  saddr = g_inet_socket_address_new (addr, src->port);
-  g_object_unref (addr);
+  cur_addr = addrs;
+  while (cur_addr) {
+    /* iterate over addresses until one works */
+    src->socket =
+        tcp_create_socket (GST_ELEMENT (src), &cur_addr, src->port, &saddr,
+        &err);
+    if (!src->socket)
+      break;
 
     /* create receiving client socket */
     GST_DEBUG_OBJECT (src, "opening receiving client socket to %s:%d",
         src->host, src->port);
 
-  src->socket =
-      g_socket_new (g_socket_address_get_family (saddr), G_SOCKET_TYPE_STREAM,
-      G_SOCKET_PROTOCOL_TCP, &err);
-  if (!src->socket)
-    goto no_socket;
-
     g_socket_set_timeout (src->socket, src->timeout);
 
     GST_DEBUG_OBJECT (src, "opened receiving client socket");
     GST_OBJECT_FLAG_SET (src, GST_TCP_CLIENT_SRC_OPEN);
 
     /* connect to server */
-  if (!g_socket_connect (src->socket, saddr, src->cancellable, &err))
+    if (g_socket_connect (src->socket, saddr, src->cancellable, &err))
+      break;
+
+    /* failed to connect, release and try next address... */
+    g_clear_object (&src->socket);
+    g_clear_object (&saddr);
+  }
+  g_list_free_full (addrs, g_object_unref);
+  if (!src->socket)
+    goto no_socket;
+
+  /* we should only have a valid saddr if connect was successful */
+  if (!saddr)
     goto connect_failed;
 
   g_object_unref (saddr);
@@ -471,19 +463,17 @@ gst_tcp_client_src_start (GstBaseSrc * bsrc)
     GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
         ("Failed to create socket: %s", err->message));
     g_clear_error (&err);
-    g_object_unref (saddr);
     return FALSE;
   }
 name_resolve:
   {
     if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
-      GST_DEBUG_OBJECT (src, "Cancelled name resolval");
+      GST_DEBUG_OBJECT (src, "Cancelled name resolution");
     } else {
       GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
           ("Failed to resolve host '%s': %s", src->host, err->message));
     }
     g_clear_error (&err);
-    g_object_unref (resolver);
     return FALSE;
   }
 connect_failed:
@@ -496,7 +486,6 @@ gst_tcp_client_src_start (GstBaseSrc * bsrc)
               err->message));
     }
     g_clear_error (&err);
-    g_object_unref (saddr);
     gst_tcp_client_src_stop (GST_BASE_SRC (src));
     return FALSE;
   }