added twisted_ex3_server.py: an example on using twisted server and coroutines together

examples/twisted_ex3_server.py

@@ -0,0 +1,73 @@
+from twisted.internet import pollreactor; pollreactor.install()
+from twisted.internet.protocol import Factory
+from twisted.internet import reactor
+from twisted.protocols import basic
+from twisted.internet.error import ConnectionDone
+
+from eventlet.api import spawn, get_hub
+from eventlet.channel import channel
+
+class LineOnlyReceiver(basic.LineOnlyReceiver):
+
+    def __init__(self, channel):
+        self.channel = channel
+
+    def lineReceived(self, line):
+        spawn(self.channel.send, line)
+
+    def connectionLost(self, reason):
+        self.channel.send_exception(reason.value)
+
+
+class line_only_receiver:
+
+    def __init__(self, protocol, channel):
+        self.protocol = protocol
+        self.channel = channel
+
+    def readline(self):
+        return self.channel.receive()
+
+    def send(self, data):
+        self.protocol.transport.write(data)
+
+    def sendline(self, line):
+        self.protocol.sendLine(line)
+
+    # iterator protocol:
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        try:
+            return self.readline()
+        except ConnectionDone:
+            raise StopIteration
+
+
+class MyFactory(Factory):
+    protocol = LineOnlyReceiver
+
+    def __init__(self, handler):
+        self.handler = handler
+
+    def buildProtocol(self, addr):
+        ch = channel()
+        p = self.protocol(ch)
+        p.factory = self
+        spawn(self.handler, line_only_receiver(p, ch))
+        return p
+
+def handler(linerecv):
+    peer = linerecv.protocol.transport.getPeer()
+    print 'new connection from %s' % (peer, )
+    try:
+        for line in linerecv:
+            print 'received from %s: %s' % (peer, line)
+        print peer, 'connection done'
+    except Exception, ex:
+        print peer, ex
+
+reactor.listenTCP(8007, MyFactory(handler))
+get_hub().switch()