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368 lines
12 KiB
368 lines
12 KiB
8 years ago
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# -*- coding: utf-8 -
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#
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# This file is part of gunicorn released under the MIT license.
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# See the NOTICE for more information.
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# design:
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# a threaded worker accepts connections in the main loop, accepted
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# connections are are added to the thread pool as a connection job. On
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# keepalive connections are put back in the loop waiting for an event.
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# If no event happen after the keep alive timeout, the connectoin is
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# closed.
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from collections import deque
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from datetime import datetime
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import errno
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from functools import partial
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import os
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import socket
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import ssl
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import sys
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from threading import RLock
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import time
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from .. import http
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from ..http import wsgi
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from .. import util
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from . import base
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from .. import six
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try:
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import concurrent.futures as futures
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except ImportError:
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raise RuntimeError("""
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You need to install the 'futures' package to use this worker with this
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Python version.
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""")
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try:
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from asyncio import selectors
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except ImportError:
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from gunicorn import selectors
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class TConn(object):
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def __init__(self, cfg, sock, client, server):
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self.cfg = cfg
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self.sock = sock
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self.client = client
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self.server = server
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self.timeout = None
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self.parser = None
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# set the socket to non blocking
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self.sock.setblocking(False)
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def init(self):
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self.sock.setblocking(True)
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if self.parser is None:
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# wrap the socket if needed
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if self.cfg.is_ssl:
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self.sock = ssl.wrap_socket(self.sock, server_side=True,
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**self.cfg.ssl_options)
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# initialize the parser
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self.parser = http.RequestParser(self.cfg, self.sock)
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def set_timeout(self):
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# set the timeout
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self.timeout = time.time() + self.cfg.keepalive
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def close(self):
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util.close(self.sock)
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class ThreadWorker(base.Worker):
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def __init__(self, *args, **kwargs):
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super(ThreadWorker, self).__init__(*args, **kwargs)
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self.worker_connections = self.cfg.worker_connections
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self.max_keepalived = self.cfg.worker_connections - self.cfg.threads
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# initialise the pool
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self.tpool = None
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self.poller = None
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self._lock = None
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self.futures = deque()
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self._keep = deque()
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self.nr_conns = 0
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@classmethod
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def check_config(cls, cfg, log):
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max_keepalived = cfg.worker_connections - cfg.threads
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if max_keepalived <= 0 and cfg.keepalive:
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log.warning("No keepalived connections can be handled. " +
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"Check the number of worker connections and threads.")
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def init_process(self):
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self.tpool = futures.ThreadPoolExecutor(max_workers=self.cfg.threads)
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self.poller = selectors.DefaultSelector()
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self._lock = RLock()
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super(ThreadWorker, self).init_process()
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def handle_quit(self, sig, frame):
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self.alive = False
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# worker_int callback
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self.cfg.worker_int(self)
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self.tpool.shutdown(False)
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time.sleep(0.1)
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sys.exit(0)
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def _wrap_future(self, fs, conn):
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fs.conn = conn
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self.futures.append(fs)
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fs.add_done_callback(self.finish_request)
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def enqueue_req(self, conn):
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conn.init()
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# submit the connection to a worker
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fs = self.tpool.submit(self.handle, conn)
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self._wrap_future(fs, conn)
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def accept(self, server, listener):
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try:
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sock, client = listener.accept()
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# initialize the connection object
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conn = TConn(self.cfg, sock, client, server)
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self.nr_conns += 1
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# enqueue the job
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self.enqueue_req(conn)
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except EnvironmentError as e:
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if e.errno not in (errno.EAGAIN,
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errno.ECONNABORTED, errno.EWOULDBLOCK):
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raise
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def reuse_connection(self, conn, client):
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with self._lock:
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# unregister the client from the poller
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self.poller.unregister(client)
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# remove the connection from keepalive
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try:
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self._keep.remove(conn)
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except ValueError:
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# race condition
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return
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# submit the connection to a worker
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self.enqueue_req(conn)
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def murder_keepalived(self):
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now = time.time()
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while True:
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with self._lock:
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try:
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# remove the connection from the queue
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conn = self._keep.popleft()
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except IndexError:
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break
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delta = conn.timeout - now
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if delta > 0:
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# add the connection back to the queue
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with self._lock:
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self._keep.appendleft(conn)
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break
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else:
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self.nr_conns -= 1
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# remove the socket from the poller
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with self._lock:
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try:
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self.poller.unregister(conn.sock)
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except EnvironmentError as e:
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if e.errno != errno.EBADF:
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raise
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except KeyError:
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# already removed by the system, continue
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pass
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# close the socket
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conn.close()
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def is_parent_alive(self):
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# If our parent changed then we shut down.
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if self.ppid != os.getppid():
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self.log.info("Parent changed, shutting down: %s", self)
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return False
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return True
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def run(self):
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# init listeners, add them to the event loop
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for sock in self.sockets:
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sock.setblocking(False)
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# a race condition during graceful shutdown may make the listener
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# name unavailable in the request handler so capture it once here
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server = sock.getsockname()
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acceptor = partial(self.accept, server)
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self.poller.register(sock, selectors.EVENT_READ, acceptor)
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while self.alive:
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# notify the arbiter we are alive
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self.notify()
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# can we accept more connections?
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if self.nr_conns < self.worker_connections:
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# wait for an event
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events = self.poller.select(1.0)
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for key, _ in events:
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callback = key.data
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callback(key.fileobj)
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# check (but do not wait) for finished requests
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result = futures.wait(self.futures, timeout=0,
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return_when=futures.FIRST_COMPLETED)
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else:
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# wait for a request to finish
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result = futures.wait(self.futures, timeout=1.0,
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return_when=futures.FIRST_COMPLETED)
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# clean up finished requests
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for fut in result.done:
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self.futures.remove(fut)
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if not self.is_parent_alive():
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break
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# hanle keepalive timeouts
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self.murder_keepalived()
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self.tpool.shutdown(False)
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self.poller.close()
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for s in self.sockets:
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s.close()
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futures.wait(self.futures, timeout=self.cfg.graceful_timeout)
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def finish_request(self, fs):
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if fs.cancelled():
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self.nr_conns -= 1
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fs.conn.close()
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return
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try:
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(keepalive, conn) = fs.result()
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# if the connection should be kept alived add it
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# to the eventloop and record it
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if keepalive:
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# flag the socket as non blocked
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conn.sock.setblocking(False)
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# register the connection
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conn.set_timeout()
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with self._lock:
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self._keep.append(conn)
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# add the socket to the event loop
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self.poller.register(conn.sock, selectors.EVENT_READ,
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partial(self.reuse_connection, conn))
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else:
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self.nr_conns -= 1
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conn.close()
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except:
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# an exception happened, make sure to close the
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# socket.
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self.nr_conns -= 1
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fs.conn.close()
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def handle(self, conn):
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keepalive = False
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req = None
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try:
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req = six.next(conn.parser)
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if not req:
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return (False, conn)
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# handle the request
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keepalive = self.handle_request(req, conn)
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if keepalive:
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return (keepalive, conn)
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except http.errors.NoMoreData as e:
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self.log.debug("Ignored premature client disconnection. %s", e)
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except StopIteration as e:
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self.log.debug("Closing connection. %s", e)
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except ssl.SSLError as e:
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if e.args[0] == ssl.SSL_ERROR_EOF:
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self.log.debug("ssl connection closed")
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conn.sock.close()
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else:
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self.log.debug("Error processing SSL request.")
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self.handle_error(req, conn.sock, conn.client, e)
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except EnvironmentError as e:
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if e.errno not in (errno.EPIPE, errno.ECONNRESET):
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self.log.exception("Socket error processing request.")
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else:
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if e.errno == errno.ECONNRESET:
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self.log.debug("Ignoring connection reset")
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else:
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self.log.debug("Ignoring connection epipe")
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except Exception as e:
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self.handle_error(req, conn.sock, conn.client, e)
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return (False, conn)
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def handle_request(self, req, conn):
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environ = {}
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resp = None
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try:
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self.cfg.pre_request(self, req)
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request_start = datetime.now()
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resp, environ = wsgi.create(req, conn.sock, conn.client,
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conn.server, self.cfg)
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environ["wsgi.multithread"] = True
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self.nr += 1
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if self.alive and self.nr >= self.max_requests:
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self.log.info("Autorestarting worker after current request.")
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resp.force_close()
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self.alive = False
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if not self.cfg.keepalive:
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resp.force_close()
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elif len(self._keep) >= self.max_keepalived:
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resp.force_close()
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respiter = self.wsgi(environ, resp.start_response)
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try:
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if isinstance(respiter, environ['wsgi.file_wrapper']):
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resp.write_file(respiter)
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else:
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for item in respiter:
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resp.write(item)
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resp.close()
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request_time = datetime.now() - request_start
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self.log.access(resp, req, environ, request_time)
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finally:
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if hasattr(respiter, "close"):
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respiter.close()
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if resp.should_close():
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self.log.debug("Closing connection.")
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return False
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except EnvironmentError:
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# pass to next try-except level
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six.reraise(*sys.exc_info())
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except Exception:
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if resp and resp.headers_sent:
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# If the requests have already been sent, we should close the
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# connection to indicate the error.
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self.log.exception("Error handling request")
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try:
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conn.sock.shutdown(socket.SHUT_RDWR)
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conn.sock.close()
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except EnvironmentError:
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pass
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raise StopIteration()
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raise
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finally:
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try:
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self.cfg.post_request(self, req, environ, resp)
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except Exception:
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self.log.exception("Exception in post_request hook")
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return True
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