proper feature discovery, restructured Connections statics, added consts for queries

scenes/App.gd

@@ -2,16 +2,19 @@ extends Node
 
 var _connection
 
+onready var n_Connection := get_node("Connections")
+
 func _service_discovery():
     var iq := yield() as Xml.XmlElement
 
     var feature_promises := Array()
     for item in iq.children[0].children:
-        feature_promises.push_back(_connection.promise_iq(item.attributes["jid"], "get", 
-            "<query xmlns='http://jabber.org/protocol/disco#items'/>",
-            _connection.iq_as_is()))
+        feature_promises.push_back(_connection.promise_iq(
+            item.attributes["jid"], "get", 
+            n_Connection.disco_info_queury,
+            n_Connection.yield_as_is()))
 
-    while not _connection.are_promises_done(feature_promises):
+    while not n_Connection.are_promises_done(feature_promises):
         yield()
 
     for feature_promise in feature_promises:
@@ -23,13 +26,13 @@ func _service_discovery():
         print(feature.as_string())
 
 func _ready():
-    _connection = $Connections.establish_new_connection("poto.cafe", "veclavtalica", "-")
+    _connection = n_Connection.establish_new_connection("poto.cafe", "veclavtalica", "-")
     if _connection == null:
         push_error("Connection failed")
         return
 
     if _connection.push_iq(_connection.domain, "get",
-            "<query xmlns='http://jabber.org/protocol/disco#items'/>",
+            n_Connection.disco_items_queury,
             _service_discovery()) != OK:
         push_error("Connection failed")
         return

scenes/Connections.gd

@@ -1,5 +1,8 @@
 extends Node
 
+const disco_info_queury := "<query xmlns='http://jabber.org/protocol/disco#info'/>"
+const disco_items_queury := "<query xmlns='http://jabber.org/protocol/disco#items'/>"
+
 class Connection extends Reference:
     var stream: StreamPeer
     var identity: String
@@ -83,19 +86,19 @@ class Connection extends Reference:
 
         return OK
 
-    static func are_promises_done(promises: Array) -> bool:
-        for promise in promises:
-            assert(promise is Promise)
-            if not promise.is_done:
-                return false
-        return true
-
-    static func iq_as_is():
-        return yield()
-
 ## Registry of connections used for poking of pending iqs.
 var _connections: Array # of WeakRef to Connection
 
+static func are_promises_done(promises: Array) -> bool:
+    for promise in promises:
+        assert(promise is Connection.Promise)
+        if not promise.is_done:
+            return false
+    return true
+
+static func yield_as_is():
+    return yield()
+
 func _ready():
     # todo: Some better interval?
     if get_tree().connect("physics_frame", self, "_process_connections") != OK:
@@ -160,14 +163,14 @@ func _process_connections() -> void:
 func establish_new_connection(domain: String, identity: String, password: String) -> Connection:
     var stream := StreamPeerTCP.new()
     if stream.connect_to_host(domain, 5222) != OK:
-        push_error("Cannot establish client->server pipe to " + domain)
+        push_error("Cannot establish connection to " + domain)
         return null
 
     while stream.get_status() == StreamPeerTCP.STATUS_CONNECTING:
         pass
 
     if stream.get_status() == StreamPeerTCP.STATUS_ERROR:
-        push_error("Cannot establish client->server pipe to " + domain)
+        push_error("Cannot establish connection to " + domain)
         return null
 
     var result := Connection.new()