Routes aren't an indexed_dict anymore, piping error handling, piping on by default

Routes are just regular dicts now, which means that their ids are strings and they are bound to the key "routes".
This allows the next feature to work:

Error reporting on disconnected peers.
Define a peer_unavaliable method in your handler and you will be notified when your pipe call has failed due to an unavaliable peer.
Handled in the "meta" route.

Piping has become such an integral feature to Highway that it doesn't make sense to disable it anymore.
This is why the argument is missing in the constructor from now on.

Shared/Highway.py

@@ -103,11 +103,14 @@ def create_exchange_map(routes):
 	return exchange_map
 
 
-def validate_exchange_map(routes):
+def convert_exchange_map(routes):
+	exchange_map = {}
 	for key in routes:
-		if not type(key) is int and type(routes[key]) is str:
-			return False
-	return True
+		if key.isnumeric() and type(routes[key]) is str:
+			exchange_map[int(key)] = routes[key]
+		else:
+			return None
+	return exchange_map
 
 
 class ConvertFailedError(ValueError):
@@ -119,21 +122,32 @@ class ConvertFailedError(ValueError):
 class Meta(Route):
 	def run(self, data, handler):
 		if type(data) is dict:
-			handler.peer_exchange_routes = data
-			if handler.debug:
-				Logging.success("Received peer exchange routes: %s" % str(data))
-			handler.peer_reverse_exchange_routes = reverse_dict(handler.peer_exchange_routes)
-			if issubclass(handler.__class__, Client):
-				handler.send(handler.exchange_routes, META_ROUTE, indexed_dict=True)
-			try:
-				handler.ready()
-			except AttributeError:
-				pass
-			if handler.debug:
-				Logging.info("Launching routes.")
-			launch_routes(handler.routes, handler)
-			if handler.debug:
-				Logging.info("Routes launched.")
+			if "routes" in data:
+				peer_exchange_routes = convert_exchange_map(data["routes"])
+				if peer_exchange_routes != None:
+					handler.peer_exchange_routes = peer_exchange_routes
+					if handler.debug:
+						Logging.success("Received peer exchange routes: %s" % str(data))
+					handler.peer_reverse_exchange_routes = reverse_dict(handler.peer_exchange_routes)
+					if issubclass(handler.__class__, Client):
+						handler.send({"routes" : handler.exchange_routes}, META_ROUTE)
+					try:
+						handler.ready()
+					except AttributeError:
+						pass
+					if handler.debug:
+						Logging.info("Launching routes.")
+					launch_routes(handler.routes, handler)
+					if handler.debug:
+						Logging.info("Routes launched.")
+				else:
+					Logging.error("Received invalid exchange routes.")
+			if "unavaliable" in data:
+					try:
+						for peer in data["unavaliable"]:
+							handler.peer_unavaliable(peer)
+					except AttributeError:
+						Logging.warning("Handler does not implement a 'peer_unavaliabe' method.")
 		if type(data) is int:
 			if data == 1:
 				Logging.error("Last route was invalid.")
@@ -163,7 +177,9 @@ class ServerPipe(Route):
 					color=Logging.LIGHT_YELLOW)
 			handler.peers[id_].send(pack_pipe_dest_message(data, handler.id_), route)
 		else:
-			Logging.error("'%s' is not present in peers." % id_)
+			handler.send({"unavaliable" : [id_]}, "meta")
+			if handler.debug:
+				Logging.error("'%s' is not present in peers." % id_)
 
 
 class DummyPipe(Route):
@@ -352,9 +368,8 @@ class Shared:
 
 
 class Server(WebSocket, Shared):
-	def setup(self, routes, websockets, piping=False, debug=False):
-		if piping:
-			routes[PIPE_ROUTE] = ServerPipe()
+	def setup(self, routes, websockets, debug=False):
+		routes[PIPE_ROUTE] = ServerPipe()
 		super().setup(routes, debug=debug)
 		self.websockets = websockets
 		self._last_websockets = self.websockets.copy()
@@ -380,22 +395,24 @@ class Server(WebSocket, Shared):
 
 
 	def post_opened(self):
-		self.send(self.exchange_routes, META_ROUTE, indexed_dict=True)
+		self.send({"routes" : self.exchange_routes}, META_ROUTE)
 
 
 class Client(WebSocketClient, Shared):
-	def setup(self, routes, piping=False, debug=False):
-		if piping:
-			self.pipe = self.__pipe
-			routes[PIPE_ROUTE] = DummyPipe()
+	def setup(self, routes, debug=False):
+		routes[PIPE_ROUTE] = DummyPipe()
 		super().setup(routes, debug=debug)
 
 		self.override_methods()
 
-	def __pipe(self, data, route, id_):
+	def pipe(self, data, route, id_, indexed_dict=False):
 		try:
 			self.send(pack_pipe_src_message(data,
 				self.peer_reverse_exchange_routes[route], id_, debug=self.debug),
-				PIPE_ROUTE)
+				PIPE_ROUTE, indexed_dict=indexed_dict)
 		except KeyError:
 			Logging.warning("'%s' does not exist." % route)
+
+
+	def peer_unavaliable(self, peer, handler):
+		pass