/usr/lib/python2.7/dist-packages/Pyro4/socketserver/multiplexserver.py is in python2-pyro4 4.63-1.
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Socket server based on socket multiplexing. Doesn't use threads.
Uses the best available selector (kqueue, poll, select).
Pyro - Python Remote Objects. Copyright by Irmen de Jong (irmen@razorvine.net).
"""
from __future__ import print_function
import socket
import time
import sys
import logging
import os
from collections import defaultdict
from Pyro4 import socketutil, errors, util
from Pyro4.configuration import config
if sys.version_info >= (3, 5):
import selectors
else:
try:
# first try selectors2 as it has better semantics when dealing with interrupted system calls
import selectors2 as selectors
except ImportError:
if sys.version_info >= (3, 4):
import selectors
else:
try:
import selectors34 as selectors
except ImportError:
selectors = None
log = logging.getLogger("Pyro4.multiplexserver")
class SocketServer_Multiplex(object):
"""Multiplexed transport server for socket connections (uses select, poll, kqueue, ...)"""
def __init__(self):
self.sock = self.daemon = self.locationStr = None
if selectors is None:
raise RuntimeError("This Python installation doesn't have the 'selectors2' or 'selectors34' module installed, " +
"which is required to use Pyro's multiplex server. Install it, or use the threadpool server instead.")
self.selector = selectors.DefaultSelector()
self.shutting_down = False
def init(self, daemon, host, port, unixsocket=None):
log.info("starting multiplexed socketserver")
log.debug("selector implementation: %s.%s", self.selector.__class__.__module__, self.selector.__class__.__name__)
self.sock = None
bind_location = unixsocket if unixsocket else (host, port)
if config.SSL:
sslContext = socketutil.getSSLcontext(servercert=config.SSL_SERVERCERT,
serverkey=config.SSL_SERVERKEY,
keypassword=config.SSL_SERVERKEYPASSWD,
cacerts=config.SSL_CACERTS)
log.info("using SSL, cert=%s key=%s cacerts=%s", config.SSL_SERVERCERT, config.SSL_SERVERKEY, config.SSL_CACERTS)
else:
sslContext = None
log.info("not using SSL")
self.sock = socketutil.createSocket(bind=bind_location,
reuseaddr=config.SOCK_REUSE,
timeout=config.COMMTIMEOUT,
noinherit=True,
nodelay=config.SOCK_NODELAY,
sslContext=sslContext)
self.daemon = daemon
self._socketaddr = sockaddr = self.sock.getsockname()
if not unixsocket and sockaddr[0].startswith("127."):
if host is None or host.lower() != "localhost" and not host.startswith("127."):
log.warning("weird DNS setup: %s resolves to localhost (127.x.x.x)", host)
if unixsocket:
self.locationStr = "./u:" + unixsocket
else:
host = host or sockaddr[0]
port = port or sockaddr[1]
if ":" in host: # ipv6
self.locationStr = "[%s]:%d" % (host, port)
else:
self.locationStr = "%s:%d" % (host, port)
self.selector.register(self.sock, selectors.EVENT_READ, self)
def __repr__(self):
return "<%s on %s; %d connections>" % (self.__class__.__name__, self.locationStr, len(self.selector.get_map()) - 1)
def __del__(self):
if self.sock is not None:
self.selector.close()
self.sock.close()
self.sock = None
def events(self, eventsockets):
"""handle events that occur on one of the sockets of this server"""
for s in eventsockets:
if self.shutting_down:
return
if s is self.sock:
# server socket, means new connection
conn = self._handleConnection(self.sock)
if conn:
self.selector.register(conn, selectors.EVENT_READ, self)
else:
# must be client socket, means remote call
active = self.handleRequest(s)
if not active:
try:
self.daemon._clientDisconnect(s)
except Exception as x:
log.warning("Error in clientDisconnect: " + str(x))
self.selector.unregister(s)
s.close()
self.daemon._housekeeping()
def _handleConnection(self, sock):
try:
if sock is None:
return
csock, caddr = sock.accept()
if hasattr(csock, "getpeercert"):
log.debug("connected %s - SSL", caddr)
else:
log.debug("connected %s - unencrypted", caddr)
if config.COMMTIMEOUT:
csock.settimeout(config.COMMTIMEOUT)
except (socket.error, OSError) as x:
err = getattr(x, "errno", x.args[0])
if err in socketutil.ERRNO_BADF or err in socketutil.ERRNO_ENOTSOCK:
# our server socket got destroyed
raise errors.ConnectionClosedError("server socket closed")
# socket errors may not lead to a server abort, so we log it and continue
err = getattr(x, "errno", x.args[0])
log.warning("accept() failed '%s' with errno=%d, shouldn't happen", x, err)
return None
try:
conn = socketutil.SocketConnection(csock)
if self.daemon._handshake(conn):
return conn
conn.close()
except: # catch all errors, otherwise the event loop could terminate
ex_t, ex_v, ex_tb = sys.exc_info()
tb = util.formatTraceback(ex_t, ex_v, ex_tb)
log.warning("error during connect/handshake: %s; %s", ex_v, "\n".join(tb))
try:
csock.shutdown(socket.SHUT_RDWR)
except (OSError, socket.error):
pass
csock.close()
return None
def shutdown(self):
self.shutting_down = True
self.wakeup()
time.sleep(0.05)
self.close()
self.sock = None
def close(self):
self.selector.close()
if self.sock:
sockname = None
try:
sockname = self.sock.getsockname()
except (socket.error, OSError):
pass
self.sock.close()
if type(sockname) is str:
# it was a Unix domain socket, remove it from the filesystem
if os.path.exists(sockname):
os.remove(sockname)
self.sock = None
@property
def sockets(self):
registrations = self.selector.get_map()
if registrations:
return [sk.fileobj for sk in registrations.values()]
else:
return []
def wakeup(self):
"""bit of a hack to trigger a blocking server to get out of the loop, useful at clean shutdowns"""
socketutil.interruptSocket(self._socketaddr)
def handleRequest(self, conn):
"""Handles a single connection request event and returns if the connection is still active"""
try:
self.daemon.handleRequest(conn)
return True
except (socket.error, errors.ConnectionClosedError, errors.SecurityError):
# client went away or caused a security error.
# close the connection silently.
try:
peername = conn.sock.getpeername()
log.debug("disconnected %s", peername)
except socket.error:
log.debug("disconnected a client")
return False
except errors.TimeoutError as x:
# for timeout errors we're not really interested in detailed traceback info
log.warning("error during handleRequest: %s" % x)
return False
except:
# other error occurred, close the connection, but also log a warning
ex_t, ex_v, ex_tb = sys.exc_info()
tb = util.formatTraceback(ex_t, ex_v, ex_tb)
msg = "error during handleRequest: %s; %s" % (ex_v, "".join(tb))
log.warning(msg)
return False
def loop(self, loopCondition=lambda: True):
log.debug("entering multiplexed requestloop")
while loopCondition():
try:
try:
events = self.selector.select(config.POLLTIMEOUT)
except OSError:
events = []
# get all the socket connection objects that have a READ event
# (the WRITE events are ignored here, they're registered to let timeouts work etc)
events_per_server = defaultdict(list)
for key, mask in events:
if mask & selectors.EVENT_READ:
events_per_server[key.data].append(key.fileobj)
for server, fileobjs in events_per_server.items():
server.events(fileobjs)
if not events_per_server:
self.daemon._housekeeping()
except socket.timeout:
pass # just continue the loop on a timeout
except KeyboardInterrupt:
log.debug("stopping on break signal")
break
def combine_loop(self, server):
for sock in server.sockets:
self.selector.register(sock, selectors.EVENT_READ, server)
server.selector = self.selector
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