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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
from mitmproxy import controller
import threading
class ReplyProxy(object):
def __init__(self, reply_func, script_thread):
self.reply_func = reply_func
self.script_thread = script_thread
self.master_reply = None
def send(self, message):
if self.master_reply is None:
self.master_reply = message
self.script_thread.start()
return
self.reply_func(message)
def done(self):
self.reply_func.send(self.master_reply)
def __getattr__(self, k):
return getattr(self.reply_func, 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.done()
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.__name__ not in controller.Events:
raise NotImplementedError(
"Concurrent decorator not supported for '%s' method." % fn.__name__
)
def _concurrent(ctx, obj):
_handle_concurrent_reply(fn, obj, ctx, obj)
return _concurrent
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