|
|
# -*- coding: utf-8 -*-
|
|
|
|
|
|
# Copyright (C) 2016-2017 RhodeCode GmbH
|
|
|
#
|
|
|
# This program is free software: you can redistribute it and/or modify
|
|
|
# it under the terms of the GNU Affero General Public License, version 3
|
|
|
# (only), as published by the Free Software Foundation.
|
|
|
#
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
# GNU General Public License for more details.
|
|
|
#
|
|
|
# You should have received a copy of the GNU Affero General Public License
|
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
#
|
|
|
# This program is dual-licensed. If you wish to learn more about the
|
|
|
# RhodeCode Enterprise Edition, including its added features, Support services,
|
|
|
# and proprietary license terms, please see https://rhodecode.com/licenses/
|
|
|
|
|
|
"""
|
|
|
This serves as a drop in replacement for pycurl. It implements the pycurl Curl
|
|
|
class in a way that is compatible with gevent.
|
|
|
"""
|
|
|
|
|
|
|
|
|
import logging
|
|
|
import gevent
|
|
|
import pycurl
|
|
|
|
|
|
# Import everything from pycurl.
|
|
|
# This allows us to use this module as a drop in replacement of pycurl.
|
|
|
from pycurl import * # noqa
|
|
|
|
|
|
from gevent import core
|
|
|
from gevent.hub import Waiter
|
|
|
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
|
|
|
class GeventCurlMulti(object):
|
|
|
"""
|
|
|
Wrapper around pycurl.CurlMulti that integrates it into gevent's event
|
|
|
loop.
|
|
|
|
|
|
Parts of this class are a modified version of code copied from the Tornado
|
|
|
Web Server project which is licensed under the Apache License, Version 2.0
|
|
|
(the "License"). To be more specific the code originates from this file:
|
|
|
https://github.com/tornadoweb/tornado/blob/stable/tornado/curl_httpclient.py
|
|
|
|
|
|
This is the original license header of the origin:
|
|
|
|
|
|
Copyright 2009 Facebook
|
|
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
|
not use this file except in compliance with the License. You may obtain
|
|
|
a copy of the License at
|
|
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
|
implied. See the License for the specific language governing
|
|
|
permissions and limitations under the License.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, loop=None):
|
|
|
self._watchers = {}
|
|
|
self._timeout = None
|
|
|
self.loop = loop or gevent.get_hub().loop
|
|
|
|
|
|
# Setup curl's multi instance.
|
|
|
self._curl_multi = pycurl.CurlMulti()
|
|
|
self.setopt(pycurl.M_TIMERFUNCTION, self._set_timeout)
|
|
|
self.setopt(pycurl.M_SOCKETFUNCTION, self._handle_socket)
|
|
|
|
|
|
def __getattr__(self, item):
|
|
|
"""
|
|
|
The pycurl.CurlMulti class is final and we cannot subclass it.
|
|
|
Therefore we are wrapping it and forward everything to it here.
|
|
|
"""
|
|
|
return getattr(self._curl_multi, item)
|
|
|
|
|
|
def add_handle(self, curl):
|
|
|
"""
|
|
|
Add handle variant that also takes care about the initial invocation of
|
|
|
socket action method. This is done by setting an immediate timeout.
|
|
|
"""
|
|
|
result = self._curl_multi.add_handle(curl)
|
|
|
self._set_timeout(0)
|
|
|
return result
|
|
|
|
|
|
def _handle_socket(self, event, fd, multi, data):
|
|
|
"""
|
|
|
Called by libcurl when it wants to change the file descriptors it cares
|
|
|
about.
|
|
|
"""
|
|
|
event_map = {
|
|
|
pycurl.POLL_NONE: core.NONE,
|
|
|
pycurl.POLL_IN: core.READ,
|
|
|
pycurl.POLL_OUT: core.WRITE,
|
|
|
pycurl.POLL_INOUT: core.READ | core.WRITE
|
|
|
}
|
|
|
|
|
|
if event == pycurl.POLL_REMOVE:
|
|
|
watcher = self._watchers.pop(fd, None)
|
|
|
if watcher is not None:
|
|
|
watcher.stop()
|
|
|
else:
|
|
|
gloop_event = event_map[event]
|
|
|
watcher = self._watchers.get(fd)
|
|
|
if watcher is None:
|
|
|
watcher = self.loop.io(fd, gloop_event)
|
|
|
watcher.start(self._handle_events, fd, pass_events=True)
|
|
|
self._watchers[fd] = watcher
|
|
|
else:
|
|
|
if watcher.events != gloop_event:
|
|
|
watcher.stop()
|
|
|
watcher.events = gloop_event
|
|
|
watcher.start(self._handle_events, fd, pass_events=True)
|
|
|
|
|
|
def _set_timeout(self, msecs):
|
|
|
"""
|
|
|
Called by libcurl to schedule a timeout.
|
|
|
"""
|
|
|
if self._timeout is not None:
|
|
|
self._timeout.stop()
|
|
|
self._timeout = self.loop.timer(msecs/1000.0)
|
|
|
self._timeout.start(self._handle_timeout)
|
|
|
|
|
|
def _handle_events(self, events, fd):
|
|
|
action = 0
|
|
|
if events & core.READ:
|
|
|
action |= pycurl.CSELECT_IN
|
|
|
if events & core.WRITE:
|
|
|
action |= pycurl.CSELECT_OUT
|
|
|
while True:
|
|
|
try:
|
|
|
ret, num_handles = self._curl_multi.socket_action(fd, action)
|
|
|
except pycurl.error, e:
|
|
|
ret = e.args[0]
|
|
|
if ret != pycurl.E_CALL_MULTI_PERFORM:
|
|
|
break
|
|
|
self._finish_pending_requests()
|
|
|
|
|
|
def _handle_timeout(self):
|
|
|
"""
|
|
|
Called by IOLoop when the requested timeout has passed.
|
|
|
"""
|
|
|
if self._timeout is not None:
|
|
|
self._timeout.stop()
|
|
|
self._timeout = None
|
|
|
while True:
|
|
|
try:
|
|
|
ret, num_handles = self._curl_multi.socket_action(
|
|
|
pycurl.SOCKET_TIMEOUT, 0)
|
|
|
except pycurl.error, e:
|
|
|
ret = e.args[0]
|
|
|
if ret != pycurl.E_CALL_MULTI_PERFORM:
|
|
|
break
|
|
|
self._finish_pending_requests()
|
|
|
|
|
|
# In theory, we shouldn't have to do this because curl will call
|
|
|
# _set_timeout whenever the timeout changes. However, sometimes after
|
|
|
# _handle_timeout we will need to reschedule immediately even though
|
|
|
# nothing has changed from curl's perspective. This is because when
|
|
|
# socket_action is called with SOCKET_TIMEOUT, libcurl decides
|
|
|
# internally which timeouts need to be processed by using a monotonic
|
|
|
# clock (where available) while tornado uses python's time.time() to
|
|
|
# decide when timeouts have occurred. When those clocks disagree on
|
|
|
# elapsed time (as they will whenever there is an NTP adjustment),
|
|
|
# tornado might call _handle_timeout before libcurl is ready. After
|
|
|
# each timeout, resync the scheduled timeout with libcurl's current
|
|
|
# state.
|
|
|
new_timeout = self._curl_multi.timeout()
|
|
|
if new_timeout >= 0:
|
|
|
self._set_timeout(new_timeout)
|
|
|
|
|
|
def _finish_pending_requests(self):
|
|
|
"""
|
|
|
Process any requests that were completed by the last call to
|
|
|
multi.socket_action.
|
|
|
"""
|
|
|
while True:
|
|
|
num_q, ok_list, err_list = self._curl_multi.info_read()
|
|
|
for curl in ok_list:
|
|
|
curl.waiter.switch()
|
|
|
for curl, errnum, errmsg in err_list:
|
|
|
curl.waiter.throw(Exception('%s %s' % (errnum, errmsg)))
|
|
|
if num_q == 0:
|
|
|
break
|
|
|
|
|
|
|
|
|
class GeventCurl(object):
|
|
|
"""
|
|
|
Gevent compatible implementation of the pycurl.Curl class. Essentially a
|
|
|
wrapper around pycurl.Curl with a customized perform method. It uses the
|
|
|
GeventCurlMulti class to implement a blocking API to libcurl's "easy"
|
|
|
interface.
|
|
|
"""
|
|
|
|
|
|
# Reference to the GeventCurlMulti instance.
|
|
|
_multi_instance = None
|
|
|
|
|
|
def __init__(self):
|
|
|
self._curl = pycurl.Curl()
|
|
|
|
|
|
def __getattr__(self, item):
|
|
|
"""
|
|
|
The pycurl.Curl class is final and we cannot subclass it. Therefore we
|
|
|
are wrapping it and forward everything to it here.
|
|
|
"""
|
|
|
return getattr(self._curl, item)
|
|
|
|
|
|
@property
|
|
|
def _multi(self):
|
|
|
"""
|
|
|
Lazy property that returns the GeventCurlMulti instance. The value is
|
|
|
cached as a class attribute. Therefore only one instance per process
|
|
|
exists.
|
|
|
"""
|
|
|
if GeventCurl._multi_instance is None:
|
|
|
GeventCurl._multi_instance = GeventCurlMulti()
|
|
|
return GeventCurl._multi_instance
|
|
|
|
|
|
def perform(self):
|
|
|
"""
|
|
|
This perform method is compatible with gevent because it uses gevent
|
|
|
synchronization mechanisms to wait for the request to finish.
|
|
|
"""
|
|
|
waiter = self._curl.waiter = Waiter()
|
|
|
try:
|
|
|
self._multi.add_handle(self._curl)
|
|
|
response = waiter.get()
|
|
|
finally:
|
|
|
self._multi.remove_handle(self._curl)
|
|
|
del self._curl.waiter
|
|
|
|
|
|
return response
|
|
|
|
|
|
# Curl is originally imported from pycurl. At this point we override it with
|
|
|
# our custom implementation.
|
|
|
Curl = GeventCurl
|
|
|
|
