network

network.py

@@ -0,0 +1,76 @@
+import socket, os, sys, json
+from threading import Thread, Lock
+
+NETTRACE = str(os.environ.get("NETTRACE", "0")) == "1"
+
+class Sock:
+	def __init__(self):
+		self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+		self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+		self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+		self.queue = []
+		self.queue_lock = Lock()
+		self.sock_thread = None
+	
+	def send_raw(self, message, address):
+		if type(message) == str:
+			message = message.encode()
+		if NETTRACE:
+			print("Send to", tuple(address), ":", message, file=sys.stderr)
+		self.sock.sendto(message, tuple(address))
+	
+	# Envoie une requete
+	def send(self, message, address):
+		message = json.dumps(message)
+		if NETTRACE:
+			print("Send to", tuple(address), ":", message, file=sys.stderr)
+		self.sock.sendto(message.encode(), tuple(address))
+	
+	# Ecoute sur une adresse
+	# Si la fonction callback est donnee, elle sera appelee avec les requetes recues.
+	# La methode get ne fonctionnera pas si un callback est defini.
+	def listen(self, address, callback=None, length=65535):
+		self.sock_thread = SockThread(self, tuple(address), length, callback)
+		self.sock_thread.setDaemon(True)
+		self.sock_thread.start()
+	
+	def get_raw(self):
+		if len(self.queue) == 0:
+			return []
+		with self.queue_lock:
+			queue = self.queue
+			self.queue = []
+		return queue
+	
+	# Retourne la liste des requetes recues depuis le dernier appel a get
+	def get(self):
+		if len(self.queue) == 0:
+			return []
+		queue = []
+		with self.queue_lock:
+			for r in self.queue:
+				try:
+					queue.append([json.loads(r[0].decode()), r[1]])
+				except:
+					pass
+			self.queue.clear()
+		return queue
+
+class SockThread(Thread):
+	def __init__(self, sock, address, length, callback=None):
+		Thread.__init__(self)
+		self.sock = sock
+		self.length = length
+		self.sock.sock.bind(tuple(address))
+		self.callback = callback
+	
+	def run(self):
+		while True:
+			r = self.sock.sock.recvfrom(self.length)
+			if NETTRACE:
+				print("Rec from", r[1], ":", r[0], file=sys.stderr)
+			if self.callback:
+				self.callback([json.loads(r[0].decode()), r[1]])
+			else:
+				with self.sock.queue_lock:
+					self.sock.queue.append(r)