added examples/twisted_portforward.py

examples/twisted_portforward.py

@@ -0,0 +1,30 @@
+import sys
+from twisted.internet import reactor
+from eventlet.coros import event, spawn_link
+from eventlet.twistedutil import join_reactor
+from eventlet.twistedutil.protocol import GreenClientCreator, SpawnFactory, UnbufferedTransport
+
+def forward(from_, to):
+    try:
+        while True:
+            x = from_.recv()
+            if not x:
+                break
+            print 'forwarding %s bytes' % len(x)
+            to.write(x)
+    finally:
+        to.loseConnection()
+
+def handler(local):
+    remote = GreenClientCreator(reactor, UnbufferedTransport).connectTCP(remote_host, remote_port)
+    error = event()
+    a = spawn_link(forward, remote, local)
+    b = spawn_link(forward, local, remote)
+    a.wait()
+    b.wait()
+
+local_port, remote_host, remote_port = sys.argv[1:]
+local_port = int(local_port)
+remote_port = int(remote_port)
+reactor.listenTCP(local_port, SpawnFactory(handler))
+reactor.run()