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"""
This module provides a @concurrent decorator primitive to
offload computations from mitmproxy's main master thread.
"""
from __future__ import absolute_import, print_function, division
import threading
class ReplyProxy(object):
def __init__(self, original_reply, script_thread):
self.original_reply = original_reply
self.script_thread = script_thread
self._ignore_call = True
self.lock = threading.Lock()
def __call__(self, *args, **kwargs):
with self.lock:
if self._ignore_call:
self.script_thread.start()
self._ignore_call = False
return
self.original_reply(*args, **kwargs)
def __getattr__(self, k):
return getattr(self.original_reply, k)
def _handle_concurrent_reply(fn, o, *args, **kwargs):
# Make first call to o.reply a no op and start the script thread.
# We must not start the script thread before, as this may lead to a nasty race condition
# where the script thread replies a different response before the normal reply, which then gets swallowed.
def run():
fn(*args, **kwargs)
# If the script did not call .reply(), we have to do it now.
reply_proxy()
script_thread = ScriptThread(target=run)
reply_proxy = ReplyProxy(o.reply, script_thread)
o.reply = reply_proxy
class ScriptThread(threading.Thread):
name = "ScriptThread"
def concurrent(fn):
if fn.func_name in (
"request",
"response",
"error",
"clientconnect",
"serverconnect",
"clientdisconnect",
"next_layer"):
def _concurrent(ctx, obj):
_handle_concurrent_reply(fn, obj, ctx, obj)
return _concurrent
raise NotImplementedError(
"Concurrent decorator not supported for '%s' method." % fn.func_name)
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