def setSessionKey(self, sesskey):
log("set session key %r" % sesskey)
# Low-level construction is now delayed until data are sent.
# This is to allow use of iterators that generate messages
# only when we're ready to do I/O so that we can effeciently
# transmit large files. Because we delay messages, we also
# have to delay setting the session key to retain proper
# ordering.
# The low-level output queue supports strings, a special close
# marker, and iterators. It doesn't support callbacks. We
# can create a allback by providing an iterator that doesn't
# yield anything.
# The hack fucntion below is a callback in iterator's
# clothing. :) It never yields anything, but is a generator
# and thus iterator, because it contains a yield statement.
def hack():
self.__hmac_send = hmac.HMAC(sesskey, digestmod=ZEO.hash)
self.__hmac_recv = hmac.HMAC(sesskey, digestmod=ZEO.hash)
if False:
yield b''
self.message_output(hack())
def close(self):
"""Prevent ConnectionManager from opening new connections"""
self.closed = 1
self.cond.acquire()
try:
t = self.thread
self.thread = None
finally:
self.cond.release()
if t is not None:
log("CM.close(): stopping and joining thread")
t.stop()
t.join(30)
if t.isAlive():
log("CM.close(): self.thread.join() timed out",
level=logging.WARNING)
for fd, obj in list(self.map.items()):
if obj is not self.trigger:
try:
obj.close()
except:
logging.getLogger(__name__ + '.' +
self.__class__.__name__).critical(
"Couldn't close a dispatcher.",
exc_info=sys.exc_info())
self.map.clear()
self.trigger.pull_trigger()
try:
self.loop_thread.join(9)
except RuntimeError:
pass # we are the thread :)
self.trigger.close()
def close(self):
"""Prevent ConnectionManager from opening new connections"""
self.closed = 1
self.cond.acquire()
try:
t = self.thread
self.thread = None
finally:
self.cond.release()
if t is not None:
log("CM.close(): stopping and joining thread")
t.stop()
t.join(30)
if t.isAlive():
log("CM.close(): self.thread.join() timed out",
level=logging.WARNING)
for fd, obj in list(self.map.items()):
if obj is not self.trigger:
try:
obj.close()
except:
logging.getLogger(__name__+'.'+self.__class__.__name__
).critical(
"Couldn't close a dispatcher.",
exc_info=sys.exc_info())
self.map.clear()
self.trigger.pull_trigger()
try:
self.loop_thread.join(9)
except RuntimeError:
pass # we are the thread :)
self.trigger.close()
def message_output(self, message):
if __debug__:
if self._debug:
log("message_output %d bytes: %s hmac=%d" %
(len(message), short_repr(message), self.__hmac_send and 1
or 0),
level=TRACE)
if self.__closed:
raise DisconnectedError(
"This action is temporarily unavailable.<p>")
self.__output_lock.acquire()
try:
# do two separate appends to avoid copying the message string
if self.__hmac_send:
self.__output.append(struct.pack(">I", len(message) | MAC_BIT))
self.__hmac_send.update(message)
self.__output.append(self.__hmac_send.digest())
else:
self.__output.append(struct.pack(">I", len(message)))
if len(message) <= SEND_SIZE:
self.__output.append(message)
else:
for i in range(0, len(message), SEND_SIZE):
self.__output.append(message[i:i + SEND_SIZE])
finally:
self.__output_lock.release()
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error as msg:
log("accepted failed: %s" % msg)
return
# We could short-circuit the attempt below in some edge cases
# and avoid a log message by checking for addr being None.
# Unfortunately, our test for the code below,
# quick_close_doesnt_kill_server, causes addr to be None and
# we'd have to write a test for the non-None case, which is
# *even* harder to provoke. :/ So we'll leave things as they
# are for now.
# It might be better to check whether the socket has been
# closed, but I don't see a way to do that. :(
# Drop flow-info from IPv6 addresses
if addr: # Sometimes None on Mac. See above.
addr = addr[:2]
try:
c = self.factory(sock, addr)
except:
if sock.fileno() in asyncore.socket_map:
del asyncore.socket_map[sock.fileno()]
ZEO.zrpc.log.logger.exception("Error in handle_accept")
else:
log("connect from %s: %s" % (repr(addr), c))
def try_connecting(self, timeout):
"""Try connecting to all self.mgr.addrlist addresses.
Return 1 if a preferred connection was found; 0 if no
connection was found; and -1 if a fallback connection was
found.
If no connection is found within timeout seconds, return 0.
"""
log("CT: attempting to connect on %d sockets" % len(self.mgr.addrlist))
deadline = time.time() + timeout
wrappers = self._create_wrappers()
for wrap in wrappers.keys():
if wrap.state == "notified":
return 1
try:
if time.time() > deadline:
return 0
r = self._connect_wrappers(wrappers, deadline)
if r is not None:
return r
if time.time() > deadline:
return 0
r = self._fallback_wrappers(wrappers, deadline)
if r is not None:
return r
# Alas, no luck.
assert not wrappers
finally:
for wrap in wrappers.keys():
wrap.close()
del wrappers
return 0
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error as msg:
log("accepted failed: %s" % msg)
return
# We could short-circuit the attempt below in some edge cases
# and avoid a log message by checking for addr being None.
# Unfortunately, our test for the code below,
# quick_close_doesnt_kill_server, causes addr to be None and
# we'd have to write a test for the non-None case, which is
# *even* harder to provoke. :/ So we'll leave things as they
# are for now.
# It might be better to check whether the socket has been
# closed, but I don't see a way to do that. :(
# Drop flow-info from IPv6 addresses
if addr: # Sometimes None on Mac. See above.
addr = addr[:2]
try:
c = self.factory(sock, addr)
except:
if sock.fileno() in asyncore.socket_map:
del asyncore.socket_map[sock.fileno()]
ZEO.zrpc.log.logger.exception("Error in handle_accept")
else:
log("connect from %s: %s" % (repr(addr), c))
def try_connecting(self, timeout):
"""Try connecting to all self.mgr.addrlist addresses.
Return 1 if a preferred connection was found; 0 if no
connection was found; and -1 if a fallback connection was
found.
If no connection is found within timeout seconds, return 0.
"""
log("CT: attempting to connect on %d sockets" % len(self.mgr.addrlist))
deadline = time.time() + timeout
wrappers = self._create_wrappers()
for wrap in wrappers.keys():
if wrap.state == "notified":
return 1
try:
if time.time() > deadline:
return 0
r = self._connect_wrappers(wrappers, deadline)
if r is not None:
return r
if time.time() > deadline:
return 0
r = self._fallback_wrappers(wrappers, deadline)
if r is not None:
return r
# Alas, no luck.
assert not wrappers
finally:
for wrap in wrappers.keys():
wrap.close()
del wrappers
return 0
def setSessionKey(self, sesskey):
log("set session key %r" % sesskey)
# Low-level construction is now delayed until data are sent.
# This is to allow use of iterators that generate messages
# only when we're ready to do I/O so that we can effeciently
# transmit large files. Because we delay messages, we also
# have to delay setting the session key to retain proper
# ordering.
# The low-level output queue supports strings, a special close
# marker, and iterators. It doesn't support callbacks. We
# can create a allback by providing an iterator that doesn't
# yield anything.
# The hack fucntion below is a callback in iterator's
# clothing. :) It never yields anything, but is a generator
# and thus iterator, because it contains a yield statement.
def hack():
self.__hmac_send = hmac.HMAC(sesskey, digestmod=ZEO.hash)
self.__hmac_recv = hmac.HMAC(sesskey, digestmod=ZEO.hash)
if False:
yield ''
self.message_output(hack())
def message_output(self, message):
if __debug__:
if self._debug:
log("message_output %d bytes: %s hmac=%d" %
(len(message), short_repr(message),
self.__hmac_send and 1 or 0),
level=TRACE)
if self.__closed:
raise DisconnectedError(
"This action is temporarily unavailable.<p>")
self.__output_lock.acquire()
try:
# do two separate appends to avoid copying the message string
if self.__hmac_send:
self.__output.append(struct.pack(">I", len(message) | MAC_BIT))
self.__hmac_send.update(message)
self.__output.append(self.__hmac_send.digest())
else:
self.__output.append(struct.pack(">I", len(message)))
if len(message) <= SEND_SIZE:
self.__output.append(message)
else:
for i in range(0, len(message), SEND_SIZE):
self.__output.append(message[i:i+SEND_SIZE])
finally:
self.__output_lock.release()
def _open_socket(self):
if type(self.addr) == types.TupleType:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def _open_socket(self):
if type(self.addr) == types.TupleType:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def decode(self, msg):
"""Decodes msg and returns its parts"""
unpickler = cPickle.Unpickler(StringIO(msg))
unpickler.find_global = server_find_global
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg), level=logging.ERROR)
raise
def server_decode(msg):
"""Decodes msg and returns its parts"""
unpickler = Unpickler(StringIO(msg))
unpickler.find_global = server_find_global
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg), level=logging.ERROR)
raise
def connect_done(self, conn, preferred):
# Called by ConnectWrapper.notify_client() after notifying the client
log("CM.connect_done(preferred=%s)" % preferred)
self.cond.acquire()
try:
self.connection = conn
if preferred:
self.thread = None
self.cond.notifyAll() # Wake up connect(sync=1)
finally:
self.cond.release()
def connect_done(self, conn, preferred):
# Called by ConnectWrapper.notify_client() after notifying the client
log("CM.connect_done(preferred=%s)" % preferred)
self.cond.acquire()
try:
self.connection = conn
if preferred:
self.thread = None
self.cond.notifyAll() # Wake up connect(sync=1)
finally:
self.cond.release()
def decode(msg):
"""Decodes msg and returns its parts"""
unpickler = Unpickler(BytesIO(msg))
unpickler.find_global = find_global
try:
unpickler.find_class = find_global # PyPy, zodbpickle, the non-c-accelerated version
except AttributeError:
pass
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg), level=logging.ERROR)
raise
def decode(msg):
"""Decodes msg and returns its parts"""
unpickler = Unpickler(BytesIO(msg))
unpickler.find_global = find_global
try:
unpickler.find_class = find_global # PyPy, zodbpickle, the non-c-accelerated version
except AttributeError:
pass
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg),
level=logging.ERROR)
raise
def close_conn(self, conn):
# Called by the connection when it is closed
self.cond.acquire()
try:
if conn is not self.connection:
# Closing a non-current connection
log("CM.close_conn() non-current", level=BLATHER)
return
log("CM.close_conn()")
self.connection = None
finally:
self.cond.release()
self.client.notifyDisconnected()
if not self.closed:
self.connect()
def close_conn(self, conn):
# Called by the connection when it is closed
self.cond.acquire()
try:
if conn is not self.connection:
# Closing a non-current connection
log("CM.close_conn() non-current", level=BLATHER)
return
log("CM.close_conn()")
self.connection = None
finally:
self.cond.release()
self.client.notifyDisconnected()
if not self.closed:
self.connect()
class Dispatcher(asyncore.dispatcher):
"""A server that accepts incoming RPC connections"""
__super_init = asyncore.dispatcher.__init__
def __init__(self, addr, factory=Connection):
self.__super_init()
self.addr = addr
self.factory = factory
self._open_socket()
def _open_socket(self):
if type(self.addr) == types.TupleType:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def writable(self):
return 0
def readable(self):
return 1
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error, msg:
log("accepted failed: %s" % msg)
return
c = self.factory(sock, addr)
log("connect from %s: %s" % (repr(addr), c))
def notify_client(self):
"""Call the client's notifyConnected().
If this succeeds, call the manager's connect_done().
If the client is already connected, we assume it's a fallback
connection, and the new connection must be a preferred
connection. The client will close the old connection.
"""
try:
self.client.notifyConnected(self.conn)
except:
log("CW: error in notifyConnected (%s)" % repr(self.addr),
level=logging.ERROR, exc_info=True)
self.close()
return
self.state = "notified"
self.mgr.connect_done(self.conn, self.preferred)
def run(self):
delay = self.mgr.tmin
success = 0
# Don't wait too long the first time.
# TODO: make timeout configurable?
attempt_timeout = 5
while not self.stopped:
success = self.try_connecting(attempt_timeout)
if not self.one_attempt.isSet():
self.one_attempt.set()
attempt_timeout = 75
if success > 0:
break
time.sleep(delay)
if self.mgr.is_connected():
log("CT: still trying to replace fallback connection",
level=logging.INFO)
delay = min(delay * 2, self.mgr.tmax)
log("CT: exiting thread: %s" % self.getName())
def connect(self, sync=0):
self.cond.acquire()
try:
if self.connection is not None:
return
t = self.thread
if t is None:
log("CM.connect(): starting ConnectThread")
self.thread = t = ConnectThread(self, self.client)
t.setDaemon(1)
t.start()
if sync:
while self.connection is None and t.isAlive():
self.cond.wait(self.sync_wait)
if self.connection is None:
log("CM.connect(sync=1): still waiting...")
assert self.connection is not None
finally:
self.cond.release()
def connect(self, sync=0):
self.cond.acquire()
try:
if self.connection is not None:
return
t = self.thread
if t is None:
log("CM.connect(): starting ConnectThread")
self.thread = t = ConnectThread(self, self.client)
t.setDaemon(1)
t.start()
if sync:
while self.connection is None and t.isAlive():
self.cond.wait(self.sync_wait)
if self.connection is None:
log("CM.connect(sync=1): still waiting...")
assert self.connection is not None
finally:
self.cond.release()
def run(self):
delay = self.mgr.tmin
success = 0
# Don't wait too long the first time.
# TODO: make timeout configurable?
attempt_timeout = 5
while not self.stopped:
success = self.try_connecting(attempt_timeout)
if not self.one_attempt.isSet():
self.one_attempt.set()
attempt_timeout = 75
if success > 0:
break
time.sleep(delay)
if self.mgr.is_connected():
log("CT: still trying to replace fallback connection",
level=logging.INFO)
delay = min(delay*2, self.mgr.tmax)
log("CT: exiting thread: %s" % self.getName())
def __init__(self, domain, addr, mgr, client):
"""Store arguments and create non-blocking socket."""
self.domain = domain
self.addr = addr
self.mgr = mgr
self.client = client
# These attributes are part of the interface
self.state = "closed"
self.sock = None
self.conn = None
self.preferred = 0
log("CW: attempt to connect to %s" % repr(addr))
try:
self.sock = socket.socket(domain, socket.SOCK_STREAM)
except socket.error as err:
log("CW: can't create socket, domain=%s: %s" % (domain, err),
level=logging.ERROR)
self.close()
return
self.sock.setblocking(0)
self.state = "opened"
def __init__(self, domain, addr, mgr, client):
"""Store arguments and create non-blocking socket."""
self.domain = domain
self.addr = addr
self.mgr = mgr
self.client = client
# These attributes are part of the interface
self.state = "closed"
self.sock = None
self.conn = None
self.preferred = 0
log("CW: attempt to connect to %s" % repr(addr))
try:
self.sock = socket.socket(domain, socket.SOCK_STREAM)
except socket.error as err:
log("CW: can't create socket, domain=%s: %s" % (domain, err),
level=logging.ERROR)
self.close()
return
self.sock.setblocking(0)
self.state = "opened"
def test_connection(self):
"""Establish and test a connection at the zrpc level.
Call the client's testConnection(), giving the client a chance
to do app-level check of the connection.
"""
self.conn = ManagedClientConnection(self.sock, self.addr, self.mgr)
self.sock = None # The socket is now owned by the connection
try:
self.preferred = self.client.testConnection(self.conn)
self.state = "tested"
except ReadOnlyError:
log("CW: ReadOnlyError in testConnection (%s)" % repr(self.addr))
self.close()
return
except:
log("CW: error in testConnection (%s)" % repr(self.addr),
level=logging.ERROR, exc_info=True)
self.close()
return
if self.preferred:
self.notify_client()
def _open_socket(self):
if type(self.addr) == types.TupleType:
if self.addr[0] == '' and _has_dualstack:
# Wildcard listen on all interfaces, both IPv4 and
# IPv6 if possible
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY,
False)
elif ':' in self.addr[0]:
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
if _has_dualstack:
# On Linux, IPV6_V6ONLY is off by default.
# If the user explicitly asked for IPv6, don't bind to IPv4
self.socket.setsockopt(socket.IPPROTO_IPV6,
socket.IPV6_V6ONLY, True)
else:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def _open_socket(self):
if type(self.addr) == tuple:
if self.addr[0] == '' and _has_dualstack:
# Wildcard listen on all interfaces, both IPv4 and
# IPv6 if possible
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
self.socket.setsockopt(
socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
elif ':' in self.addr[0]:
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
if _has_dualstack:
# On Linux, IPV6_V6ONLY is off by default.
# If the user explicitly asked for IPv6, don't bind to IPv4
self.socket.setsockopt(
socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, True)
else:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def _connect_wrappers(self, wrappers, deadline):
# Next wait until they all actually connect (or fail)
# The deadline is necessary, because we'd wait forever if a
# sockets never connects or fails.
while wrappers:
if self.stopped:
for wrap in wrappers.keys():
wrap.close()
return 0
# Select connecting wrappers
connecting = [wrap
for wrap in wrappers.keys()
if wrap.state == "connecting"]
if not connecting:
break
if time.time() > deadline:
break
try:
r, w, x = select.select([], connecting, connecting, 1.0)
log("CT: select() %d, %d, %d" % tuple(map(len, (r,w,x))))
except select.error as msg:
log("CT: select failed; msg=%s" % str(msg),
level=logging.WARNING)
continue
# Exceptable wrappers are in trouble; close these suckers
for wrap in x:
log("CT: closing troubled socket %s" % str(wrap.addr))
del wrappers[wrap]
wrap.close()
# Writable sockets are connected
for wrap in w:
wrap.connect_procedure()
if wrap.state == "notified":
del wrappers[wrap] # Don't close this one
for wrap in wrappers.keys():
wrap.close()
return 1
if wrap.state == "closed":
del wrappers[wrap]
def _connect_wrappers(self, wrappers, deadline):
# Next wait until they all actually connect (or fail)
# The deadline is necessary, because we'd wait forever if a
# sockets never connects or fails.
while wrappers:
if self.stopped:
for wrap in wrappers.keys():
wrap.close()
return 0
# Select connecting wrappers
connecting = [
wrap for wrap in wrappers.keys() if wrap.state == "connecting"
]
if not connecting:
break
if time.time() > deadline:
break
try:
r, w, x = select.select([], connecting, connecting, 1.0)
log("CT: select() %d, %d, %d" % tuple(map(len, (r, w, x))))
except select.error as msg:
log("CT: select failed; msg=%s" % str(msg),
level=logging.WARNING)
continue
# Exceptable wrappers are in trouble; close these suckers
for wrap in x:
log("CT: closing troubled socket %s" % str(wrap.addr))
del wrappers[wrap]
wrap.close()
# Writable sockets are connected
for wrap in w:
wrap.connect_procedure()
if wrap.state == "notified":
del wrappers[wrap] # Don't close this one
for wrap in wrappers.keys():
wrap.close()
return 1
if wrap.state == "closed":
del wrappers[wrap]
def connect_procedure(self):
"""Call sock.connect_ex(addr) and interpret result."""
if self.state in ("opened", "connecting"):
try:
err = self.sock.connect_ex(self.addr)
except socket.error as msg:
log("CW: connect_ex(%r) failed: %s" % (self.addr, msg),
level=logging.ERROR)
self.close()
return
log("CW: connect_ex(%s) returned %s" %
(self.addr, errno.errorcode.get(err) or str(err)))
if err in _CONNECT_IN_PROGRESS:
self.state = "connecting"
return
if err not in _CONNECT_OK:
log("CW: error connecting to %s: %s" %
(self.addr, errno.errorcode.get(err) or str(err)),
level=logging.WARNING)
self.close()
return
self.state = "connected"
if self.state == "connected":
self.test_connection()
def connect_procedure(self):
"""Call sock.connect_ex(addr) and interpret result."""
if self.state in ("opened", "connecting"):
try:
err = self.sock.connect_ex(self.addr)
except socket.error as msg:
log("CW: connect_ex(%r) failed: %s" % (self.addr, msg),
level=logging.ERROR)
self.close()
return
log("CW: connect_ex(%s) returned %s" %
(self.addr, errno.errorcode.get(err) or str(err)))
if err in _CONNECT_IN_PROGRESS:
self.state = "connecting"
return
if err not in _CONNECT_OK:
log("CW: error connecting to %s: %s" %
(self.addr, errno.errorcode.get(err) or str(err)),
level=logging.WARNING)
self.close()
return
self.state = "connected"
if self.state == "connected":
self.test_connection()
def setSessionKey(self, sesskey):
log("set session key %r" % sesskey)
self.__hmac_send = hmac.HMAC(sesskey, digestmod=sha)
self.__hmac_recv = hmac.HMAC(sesskey, digestmod=sha)
def setSessionKey(self, sesskey):
log("set session key %r" % sesskey)
self.__hmac_send = hmac.HMAC(sesskey, digestmod=sha)
self.__hmac_recv = hmac.HMAC(sesskey, digestmod=sha)
def handle_read(self):
self.__input_lock.acquire()
try:
# Use a single __inp buffer and integer indexes to make this fast.
try:
d = self.recv(8192)
except socket.error, err:
if err[0] in expected_socket_read_errors:
return
raise
if not d:
return
input_len = self.__input_len + len(d)
msg_size = self.__msg_size
state = self.__state
has_mac = self.__has_mac
inp = self.__inp
if msg_size > input_len:
if inp is None:
self.__inp = d
elif type(self.__inp) is StringType:
self.__inp = [self.__inp, d]
else:
self.__inp.append(d)
self.__input_len = input_len
return # keep waiting for more input
# load all previous input and d into single string inp
if isinstance(inp, StringType):
inp = inp + d
elif inp is None:
inp = d
else:
inp.append(d)
inp = "".join(inp)
offset = 0
while (offset + msg_size) <= input_len:
msg = inp[offset:offset + msg_size]
offset = offset + msg_size
if not state:
msg_size = struct.unpack(">I", msg)[0]
has_mac = msg_size & MAC_BIT
if has_mac:
msg_size ^= MAC_BIT
msg_size += 20
elif self.__hmac_send:
raise ValueError("Received message without MAC")
state = 1
else:
msg_size = 4
state = 0
# Obscure: We call message_input() with __input_lock
# held!!! And message_input() may end up calling
# message_output(), which has its own lock. But
# message_output() cannot call message_input(), so
# the locking order is always consistent, which
# prevents deadlock. Also, message_input() may
# take a long time, because it can cause an
# incoming call to be handled. During all this
# time, the __input_lock is held. That's a good
# thing, because it serializes incoming calls.
if has_mac:
mac = msg[:20]
msg = msg[20:]
if self.__hmac_recv:
self.__hmac_recv.update(msg)
_mac = self.__hmac_recv.digest()
if mac != _mac:
raise ValueError("MAC failed: %r != %r" %
(_mac, mac))
else:
log("Received MAC but no session key set")
elif self.__hmac_send:
raise ValueError("Received message without MAC")
self.message_input(msg)
self.__state = state
self.__has_mac = has_mac
self.__msg_size = msg_size
self.__inp = inp[offset:]
self.__input_len = input_len - offset
def error(self, exc_info):
log("Error raised in delayed method", logging.ERROR, exc_info=True)
self.return_error(self.msgid, 0, *exc_info[:2])
def handle_read(self):
self.__input_lock.acquire()
try:
# Use a single __inp buffer and integer indexes to make this fast.
try:
d = self.recv(8192)
except socket.error as err:
if err[0] in expected_socket_read_errors:
return
raise
if not d:
return
input_len = self.__input_len + len(d)
msg_size = self.__msg_size
state = self.__state
has_mac = self.__has_mac
inp = self.__inp
if msg_size > input_len:
if inp is None:
self.__inp = d
elif isinstance(self.__inp, six.binary_type):
self.__inp = [self.__inp, d]
else:
self.__inp.append(d)
self.__input_len = input_len
return # keep waiting for more input
# load all previous input and d into single string inp
if isinstance(inp, six.binary_type):
inp = inp + d
elif inp is None:
inp = d
else:
inp.append(d)
inp = b"".join(inp)
offset = 0
while (offset + msg_size) <= input_len:
msg = inp[offset:offset + msg_size]
offset = offset + msg_size
if not state:
msg_size = struct.unpack(">I", msg)[0]
has_mac = msg_size & MAC_BIT
if has_mac:
msg_size ^= MAC_BIT
msg_size += 20
elif self.__hmac_send:
raise ValueError("Received message without MAC")
state = 1
else:
msg_size = 4
state = 0
# Obscure: We call message_input() with __input_lock
# held!!! And message_input() may end up calling
# message_output(), which has its own lock. But
# message_output() cannot call message_input(), so
# the locking order is always consistent, which
# prevents deadlock. Also, message_input() may
# take a long time, because it can cause an
# incoming call to be handled. During all this
# time, the __input_lock is held. That's a good
# thing, because it serializes incoming calls.
if has_mac:
mac = msg[:20]
msg = msg[20:]
if self.__hmac_recv:
self.__hmac_recv.update(msg)
_mac = self.__hmac_recv.digest()
if mac != _mac:
raise ValueError("MAC failed: %r != %r"
% (_mac, mac))
else:
log("Received MAC but no session key set")
elif self.__hmac_send:
raise ValueError("Received message without MAC")
self.message_input(msg)
self.__state = state
self.__has_mac = has_mac
self.__msg_size = msg_size
self.__inp = inp[offset:]
self.__input_len = input_len - offset
finally:
self.__input_lock.release()
def error(self, exc_info):
self.ready.wait()
log("Error raised in delayed method", logging.ERROR, exc_info=exc_info)
self.conn.call_from_thread(Delay.error, self, exc_info)
def error(self, exc_info):
self.sent = 'error'
log("Error raised in delayed method", logging.ERROR, exc_info=True)
self.conn.return_error(self.msgid, *exc_info[:2])
def error(self, exc_info):
self.sent = 'error'
log("Error raised in delayed method", logging.ERROR, exc_info=True)
self.conn.return_error(self.msgid, *exc_info[:2])
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error, msg:
log("accepted failed: %s" % msg)
return
class Dispatcher(asyncore.dispatcher):
"""A server that accepts incoming RPC connections"""
__super_init = asyncore.dispatcher.__init__
def __init__(self, addr, factory=Connection):
self.__super_init()
self.addr = addr
self.factory = factory
self._open_socket()
def _open_socket(self):
if type(self.addr) == types.TupleType:
if self.addr[0] == '' and _has_dualstack:
# Wildcard listen on all interfaces, both IPv4 and
# IPv6 if possible
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY,
False)
elif ':' in self.addr[0]:
self.create_socket(socket.AF_INET6, socket.SOCK_STREAM)
if _has_dualstack:
# On Linux, IPV6_V6ONLY is off by default.
# If the user explicitly asked for IPv6, don't bind to IPv4
self.socket.setsockopt(socket.IPPROTO_IPV6,
socket.IPV6_V6ONLY, True)
else:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
else:
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.set_reuse_addr()
log("listening on %s" % str(self.addr), logging.INFO)
self.bind(self.addr)
self.listen(5)
def writable(self):
return 0
def readable(self):
return 1
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error, msg:
log("accepted failed: %s" % msg)
return
# We could short-circuit the attempt below in some edge cases
# and avoid a log message by checking for addr being None.
# Unfortunately, our test for the code below,
# quick_close_doesnt_kill_server, causes addr to be None and
# we'd have to write a test for the non-None case, which is
# *even* harder to provoke. :/ So we'll leave things as they
# are for now.
# It might be better to check whether the socket has been
# closed, but I don't see a way to do that. :(
# Drop flow-info from IPv6 addresses
if addr: # Sometimes None on Mac. See above.
addr = addr[:2]
try:
c = self.factory(sock, addr)
except:
if sock.fileno() in asyncore.socket_map:
del asyncore.socket_map[sock.fileno()]
ZEO.zrpc.log.logger.exception("Error in handle_accept")
else:
log("connect from %s: %s" % (repr(addr), c))
def error(self, exc_info):
self.ready.wait()
log("Error raised in delayed method", logging.ERROR, exc_info=exc_info)
self.conn.call_from_thread(Delay.error, self, exc_info)
def error(self, exc_info):
log("Error raised in delayed method", logging.ERROR, exc_info=True)
self.return_error(self.msgid, 0, *exc_info[:2])
def handle_accept(self):
try:
sock, addr = self.accept()
except socket.error, msg:
log("accepted failed: %s" % msg)
return
