A new interface for reply

Reply is now explicit - it's no longer a callable itself. Instead, we have:

    reply.kill()            - kill the flow
    reply.ack()             - ack, but don't send anything
    reply.send(message)     - send a response

This is part of an incremental move to detach reply from our flow objects,
and unify the script and handler interfaces.

examples/redirect_requests.py

@@ -16,7 +16,7 @@ def request(context, flow):
             "HTTP/1.1", 200, "OK",
             Headers(Content_Type="text/html"),
             "helloworld")
-        flow.reply(resp)
+        flow.reply.send(resp)
 
     # Method 2: Redirect the request to a different server
     if flow.request.pretty_host.endswith("example.org"):

examples/tls_passthrough.py

@@ -134,5 +134,5 @@ def next_layer(context, next_layer):
             # We don't intercept - reply with a pass-through layer and add a "skipped" entry.
             context.log("TLS passthrough for %s" % repr(next_layer.server_conn.address), "info")
             next_layer_replacement = RawTCPLayer(next_layer.ctx, logging=False)
-            next_layer.reply(next_layer_replacement)
+            next_layer.reply.send(next_layer_replacement)
             context.tls_strategy.record_skipped(server_address)

mitmproxy/controller.py

@@ -145,10 +145,6 @@ class Channel(object):
         self.q.put((mtype, m))
 
 
-# Special value to distinguish the case where no reply was sent
-NO_REPLY = object()
-
-
 def handler(f):
     @functools.wraps(f)
     def wrapper(*args, **kwargs):
@@ -199,22 +195,19 @@ class Reply(object):
         self.handled = False
 
     def ack(self):
-        self(NO_REPLY)
+        self.send(self.obj)
 
     def kill(self):
-        self(exceptions.Kill)
+        self.send(exceptions.Kill)
 
     def take(self):
         self.taken = True
 
-    def __call__(self, msg=NO_REPLY):
+    def send(self, msg):
         if self.acked:
             raise exceptions.ControlException("Message already acked.")
         self.acked = True
-        if msg is NO_REPLY:
-            self.q.put(self.obj)
-        else:
-            self.q.put(msg)
+        self.q.put(msg)
 
     def __del__(self):
         if not self.acked:
@@ -233,13 +226,13 @@ class DummyReply(object):
         self.handled = False
 
     def kill(self):
-        self()
+        self.send(None)
 
     def ack(self):
-        self()
+        self.send(None)
 
     def take(self):
         self.taken = True
 
-    def __call__(self, msg=False):
+    def send(self, msg):
         self.acked = True

mitmproxy/script/concurrent.py

@@ -4,6 +4,7 @@ offload computations from mitmproxy's main master thread.
 """
 from __future__ import absolute_import, print_function, division
 
+from mitmproxy import controller
 import threading
 
 
@@ -14,15 +15,15 @@ class ReplyProxy(object):
         self.script_thread = script_thread
         self.master_reply = None
 
-    def __call__(self, *args):
+    def send(self, message):
         if self.master_reply is None:
-            self.master_reply = args
+            self.master_reply = message
             self.script_thread.start()
             return
-        self.reply_func(*args)
+        self.reply_func(message)
 
     def done(self):
-        self.reply_func(*self.master_reply)
+        self.reply_func.send(self.master_reply)
 
     def __getattr__(self, k):
         return getattr(self.reply_func, k)
@@ -49,17 +50,11 @@ class ScriptThread(threading.Thread):
 
 
 def concurrent(fn):
-    if fn.__name__ in (
-            "request",
-            "response",
-            "error",
-            "clientconnect",
-            "serverconnect",
-            "clientdisconnect",
-            "next_layer"):
-        def _concurrent(ctx, obj):
-            _handle_concurrent_reply(fn, obj, ctx, obj)
+    if fn.__name__ not in controller.Events:
+        raise NotImplementedError(
+            "Concurrent decorator not supported for '%s' method." % fn.__name__
+        )
 
-        return _concurrent
-    raise NotImplementedError(
-        "Concurrent decorator not supported for '%s' method." % fn.__name__)
+    def _concurrent(ctx, obj):
+        _handle_concurrent_reply(fn, obj, ctx, obj)
+    return _concurrent

test/mitmproxy/test_controller.py

@@ -66,7 +66,7 @@ class TestChannel(object):
         def reply():
             m, obj = q.get()
             assert m == "test"
-            obj.reply(42)
+            obj.reply.send(42)
 
         Thread(target=reply).start()
 
@@ -86,7 +86,7 @@ class TestDummyReply(object):
     def test_simple(self):
         reply = controller.DummyReply()
         assert not reply.acked
-        reply()
+        reply.ack()
         assert reply.acked
 
 
@@ -94,16 +94,16 @@ class TestReply(object):
     def test_simple(self):
         reply = controller.Reply(42)
         assert not reply.acked
-        reply("foo")
+        reply.send("foo")
         assert reply.acked
         assert reply.q.get() == "foo"
 
     def test_default(self):
         reply = controller.Reply(42)
-        reply()
+        reply.ack()
         assert reply.q.get() == 42
 
     def test_reply_none(self):
         reply = controller.Reply(42)
-        reply(None)
+        reply.send(None)
         assert reply.q.get() is None

test/mitmproxy/test_server.py

@@ -743,7 +743,7 @@ class MasterFakeResponse(tservers.TestMaster):
     @controller.handler
     def request(self, f):
         resp = HTTPResponse.wrap(netlib.tutils.tresp())
-        f.reply(resp)
+        f.reply.send(resp)
 
 
 class TestFakeResponse(tservers.HTTPProxyTest):
@@ -819,7 +819,7 @@ class MasterIncomplete(tservers.TestMaster):
     def request(self, f):
         resp = HTTPResponse.wrap(netlib.tutils.tresp())
         resp.content = None
-        f.reply(resp)
+        f.reply.send(resp)
 
 
 class TestIncompleteResponse(tservers.HTTPProxyTest):