/usr/share/pyshared/circuits/net/sockets.py is in python-circuits 2.1.0-2.
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# Date: 04th August 2004
# Author: James Mills <prologic@shortcircuit.net.au>
import select
"""Socket Components
This module contains various Socket Components for use with Networking.
"""
import os
from collections import defaultdict, deque
from errno import EAGAIN, EALREADY, EBADF
from errno import ECONNABORTED, EINPROGRESS, EINTR, EISCONN, EMFILE, ENFILE
from errno import ENOBUFS, ENOMEM, ENOTCONN, EPERM, EPIPE, EINVAL, EWOULDBLOCK
from _socket import socket as SocketType
from socket import gaierror, error
from socket import getfqdn, gethostbyname, socket, getaddrinfo, gethostname
from socket import AF_INET, AF_INET6, IPPROTO_TCP, SOCK_STREAM, SOCK_DGRAM
from socket import SOL_SOCKET, SO_BROADCAST, SO_REUSEADDR, TCP_NODELAY
try:
from ssl import wrap_socket as ssl_socket
from ssl import CERT_NONE, PROTOCOL_SSLv23, SSLError, SSL_ERROR_WANT_READ, \
SSL_ERROR_WANT_WRITE
HAS_SSL = 1
except ImportError:
import warnings
warnings.warn("No SSL support available.")
HAS_SSL = 0
from circuits.six import binary_type
from circuits.core.utils import findcmp
from circuits.core.pollers import BasePoller, Poller
from circuits.core import handler, Event, BaseComponent
BUFSIZE = 4096 # 4KB Buffer
BACKLOG = 5000 # 5K Concurrent Connections
###
### Event Objects
###
class Connect(Event):
"""Connect Event
This Event is sent when a new client connection has arrived on a server.
This event is also used for client's to initiate a new connection to
a remote host.
.. note ::
This event is used for both Client and Server Components.
:param args: Client: (host, port) Server: (sock, host, port)
:type args: tuple
:param kwargs: Client: (ssl)
:type kwargs: dict
"""
def __init__(self, *args, **kwargs):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Connect, self).__init__(*args, **kwargs)
class Disconnect(Event):
"""Disconnect Event
This Event is sent when a client connection has closed on a server.
This event is also used for client's to disconnect from a remote host.
@note: This event is used for both Client and Server Components.
:param args: Client: () Server: (sock)
:type tuple: tuple
"""
def __init__(self, *args):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Disconnect, self).__init__(*args)
class Connected(Event):
"""Connected Event
This Event is sent when a client has successfully connected.
@note: This event is for Client Components.
:param host: The hostname connected to.
:type str: str
:param port: The port connected to
:type int: int
"""
def __init__(self, host, port):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Connected, self).__init__(host, port)
class Disconnected(Event):
"""Disconnected Event
This Event is sent when a client has disconnected
@note: This event is for Client Components.
"""
def __init__(self):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Disconnected, self).__init__()
class Read(Event):
"""Read Event
This Event is sent when a client or server connection has read any data.
@note: This event is used for both Client and Server Components.
:param args: Client: (data) Server: (sock, data)
:type tuple: tuple
"""
def __init__(self, *args):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Read, self).__init__(*args)
class SocketError(Event):
"""SocketError Event
This Event is sent when a client or server connection has an error.
@note: This event is used for both Client and Server Components.
:param args: Client: (error) Server: (sock, error)
:type tuple: tuple
"""
def __init__(self, *args):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(SocketError, self).__init__(*args)
class Write(Event):
"""Write Event
This Event is used to notify a client, client connection or server that
we have data to be written.
@note: This event is never sent, it is used to send data.
@note: This event is used for both Client and Server Components.
:param args: Client: (data) Server: (sock, data)
:type tuple: tuple
"""
def __init__(self, *args):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Write, self).__init__(*args)
class Close(Event):
"""Close Event
This Event is used to notify a client, client connection or server that
we want to close.
@note: This event is never sent, it is used to close.
@note: This event is used for both Client and Server Components.
:param args: Client: () Server: (sock)
:type tuple: tuple
"""
def __init__(self, *args):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Close, self).__init__(*args)
class Ready(Event):
"""Ready Event
This Event is used to notify the rest of the system that the underlying
Client or Server Component is ready to begin processing connections or
incoming/outgoing data. (This is triggered as a direct result of having
the capability to support multiple client/server components with a single
poller component instance in a system).
@note: This event is used for both Client and Server Components.
:param component: The Client/Server Component that is ready.
:type tuple: Component (Client/Server)
:param bind: The (host, port) the server has bound to.
:type tuple: (host, port)
"""
def __init__(self, component, bind=None):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
args = (component, bind) if bind is not None else (component,)
super(Ready, self).__init__(*args)
class Closed(Event):
"""Closed Event
This Event is sent when a server has closed its listening socket.
@note: This event is for Server components.
"""
def __init__(self):
"x.__init__(...) initializes x; see x.__class__.__doc__ for signature"
super(Closed, self).__init__()
class Client(BaseComponent):
channel = "client"
def __init__(self, bind=None, bufsize=BUFSIZE, channel=channel):
super(Client, self).__init__(channel=channel)
if isinstance(bind, SocketType):
self._bind = bind.getsockname()
self._sock = bind
else:
self._bind = self.parse_bind_parameter(bind)
self._sock = self._create_socket()
self._bufsize = bufsize
self._ssock = None
self._poller = None
self._buffer = deque()
self._closeflag = False
self._connected = False
self.host = None
self.port = 0
self.secure = False
self.server = {}
self.issuer = {}
def parse_bind_parameter(self, bind_parameter):
return parse_ipv4_parameter(bind_parameter)
@property
def connected(self):
return getattr(self, "_connected", None)
@handler("registered", "started", channel="*")
def _on_registered_or_started(self, component, manager=None):
if self._poller is None:
if isinstance(component, BasePoller):
self._poller = component
self.fire(Ready(self))
else:
if component is not self:
return
component = findcmp(self.root, BasePoller)
if component is not None:
self._poller = component
self.fire(Ready(self))
else:
self._poller = Poller().register(self)
self.fire(Ready(self))
@handler("stopped", channel="*")
def _on_stopped(self, component):
self.fire(Close())
@handler("read_value_changed")
def _on_read_value_changed(self, value):
if isinstance(value, binary_type):
self.fire(Write(value))
@handler("prepare_unregister", channel="*")
def _on_prepare_unregister(self, event, c):
if event.in_subtree(self):
self._close()
def _close(self):
if not self._connected:
return
self._poller.discard(self._sock)
self._buffer.clear()
self._closeflag = False
self._connected = False
try:
self._sock.shutdown(2)
self._sock.close()
except error:
pass
self.fire(Disconnected())
@handler("close")
def close(self):
if not self._buffer:
self._close()
elif not self._closeflag:
self._closeflag = True
def _read(self):
try:
if self.secure and self._ssock:
data = self._ssock.read(self._bufsize)
else:
data = self._sock.recv(self._bufsize)
if data:
self.fire(Read(data)).notify = True
else:
self.close()
except error as e:
if e.args[0] == EWOULDBLOCK:
return
else:
self.fire(SocketError(e))
self._close()
def _write(self, data):
try:
if self.secure and self._ssock:
nbytes = self._ssock.write(data)
else:
nbytes = self._sock.send(data)
if nbytes < len(data):
self._buffer.appendleft(data[nbytes:])
except error as e:
if e.args[0] in (EPIPE, ENOTCONN):
self._close()
else:
self.fire(SocketError(e))
@handler("write")
def write(self, data):
if not self._poller.isWriting(self._sock):
self._poller.addWriter(self, self._sock)
self._buffer.append(data)
@handler("_disconnect", filter=True)
def __on_disconnect(self, sock):
self._close()
@handler("_read", filter=True)
def __on_read(self, sock):
self._read()
@handler("_write", filter=True)
def __on_write(self, sock):
if self._buffer:
data = self._buffer.popleft()
self._write(data)
if not self._buffer:
if self._closeflag:
self._close()
elif self._poller.isWriting(self._sock):
self._poller.removeWriter(self._sock)
def _do_handshake_for_non_blocking(ssock):
"""
This is how to do handshake for an ssl socket with underlying
non-blocking socket (according to the Python doc).
"""
while True:
try:
ssock.do_handshake()
break
except SSLError as err:
if err.args[0] == SSL_ERROR_WANT_READ:
select.select([ssock], [], [])
elif err.args[0] == SSL_ERROR_WANT_WRITE:
select.select([], [ssock], [])
else:
raise
class TCPClient(Client):
socket_family = AF_INET
def _create_socket(self):
sock = socket(self.socket_family, SOCK_STREAM, IPPROTO_TCP)
if self._bind is not None:
sock.bind(self._bind)
sock.setblocking(False)
sock.setsockopt(IPPROTO_TCP, TCP_NODELAY, 1)
return sock
@handler("connect")
def connect(self, host, port, secure=False, **kwargs):
self.host = host
self.port = port
self.secure = secure
if self.secure:
self.certfile = kwargs.get("certfile", None)
self.keyfile = kwargs.get("keyfile", None)
try:
r = self._sock.connect((host, port))
except error as e:
if e.args[0] in (EBADF, EINVAL,):
self._sock = self._create_socket()
r = self._sock.connect_ex((host, port))
else:
r = e.args[0]
if r in (EISCONN, EWOULDBLOCK, EINPROGRESS, EALREADY):
self._connected = True
else:
raise
self._connected = True
self._poller.addReader(self, self._sock)
if self.secure:
self._ssock = ssl_socket(
self._sock, self.keyfile, self.certfile,
do_handshake_on_connect=False
)
_do_handshake_for_non_blocking(self._ssock)
self.fire(Connected(host, port))
class TCP6Client(TCPClient):
socket_family = AF_INET6
def parse_bind_parameter(self, bind_parameter):
return parse_ipv6_parameter(bind_parameter)
class UNIXClient(Client):
def _create_socket(self):
from socket import AF_UNIX
sock = socket(AF_UNIX, SOCK_STREAM)
if self._bind is not None:
sock.bind(self._bind)
sock.setblocking(False)
return sock
@handler("ready")
def ready(self, component):
if self._poller is not None and self._connected:
self._poller.addReader(self, self._sock)
@handler("connect")
def connect(self, path, secure=False, **kwargs):
self.path = path
self.secure = secure
if self.secure:
self.certfile = kwargs.get("certfile", None)
self.keyfile = kwargs.get("keyfile", None)
try:
r = self._sock.connect_ex(path)
except error as e:
r = e.args[0]
if r:
if r in (EISCONN, EWOULDBLOCK, EINPROGRESS, EALREADY):
self._connected = True
else:
self.fire(SocketError(r))
return
self._connected = True
self._poller.addReader(self, self._sock)
if self.secure:
self._ssock = ssl_socket(
self._sock, self.keyfile, self.certfile,
do_handshake_on_connect=False
)
_do_handshake_for_non_blocking(self._ssock)
self.fire(Connected(gethostname(), path))
class Server(BaseComponent):
channel = "server"
def __init__(self, bind, secure=False, backlog=BACKLOG,
bufsize=BUFSIZE, channel=channel, **kwargs):
super(Server, self).__init__(channel=channel)
self._bind = self.parse_bind_parameter(bind)
self._backlog = backlog
self._bufsize = bufsize
if isinstance(bind, socket):
self._sock = bind
else:
self._sock = self._create_socket()
self._closeq = []
self._clients = []
self._poller = None
self._buffers = defaultdict(deque)
self.secure = secure
if self.secure:
self.certfile = kwargs.get("certfile", None)
self.keyfile = kwargs.get("keyfile", None)
self.cert_reqs = kwargs.get("cert_reqs", CERT_NONE)
self.ssl_version = kwargs.get("ssl_version", PROTOCOL_SSLv23)
self.ca_certs = kwargs.get("ca_certs", None)
def parse_bind_parameter(self, bind_parameter):
return parse_ipv4_parameter(bind_parameter)
@property
def connected(self):
return True
@property
def host(self):
if getattr(self, "_sock", None) is not None:
try:
sockname = self._sock.getsockname()
if isinstance(sockname, tuple):
return sockname[0]
else:
return sockname
except error:
return None
@property
def port(self):
if getattr(self, "_sock", None) is not None:
try:
sockname = self._sock.getsockname()
if isinstance(sockname, tuple):
return sockname[1]
except error:
return None
@handler("registered", "started", channel="*")
def _on_registered_or_started(self, component, manager=None):
if self._poller is None:
if isinstance(component, BasePoller):
self._poller = component
self._poller.addReader(self, self._sock)
self.fire(Ready(self, (self.host, self.port)))
else:
if component is not self:
return
component = findcmp(self.root, BasePoller)
if component is not None:
self._poller = component
self._poller.addReader(self, self._sock)
self.fire(Ready(self, (self.host, self.port)))
else:
self._poller = Poller().register(self)
self._poller.addReader(self, self._sock)
self.fire(Ready(self, (self.host, self.port)))
@handler("stopped", channel="*")
def _on_stopped(self, component):
self.fire(Close())
@handler("read_value_changed")
def _on_read_value_changed(self, value):
if isinstance(value.value, binary_type):
sock = value.event.args[0]
self.fire(Write(sock, value.value))
def _close(self, sock):
if sock is None:
return
if not sock == self._sock and sock not in self._clients:
return
self._poller.discard(sock)
if sock in self._buffers:
del self._buffers[sock]
if sock in self._clients:
self._clients.remove(sock)
else:
self._sock = None
try:
sock.shutdown(2)
sock.close()
except error:
pass
self.fire(Disconnect(sock))
@handler("close")
def close(self, sock=None):
closed = sock is None
if sock is None:
socks = [self._sock]
socks.extend(self._clients[:])
else:
socks = [sock]
for sock in socks:
if not self._buffers[sock]:
self._close(sock)
elif sock not in self._closeq:
self._closeq.append(sock)
if closed:
self.fire(Closed())
def _read(self, sock):
if sock not in self._clients:
return
try:
data = sock.recv(self._bufsize)
if data:
self.fire(Read(sock, data)).notify = True
else:
self.close(sock)
except error as e:
if e.args[0] == EWOULDBLOCK:
return
else:
self.fire(SocketError(sock, e))
self._close(sock)
def _write(self, sock, data):
if sock not in self._clients:
return
try:
nbytes = sock.send(data)
if nbytes < len(data):
self._buffers[sock].appendleft(data[nbytes:])
except error as e:
if e.args[0] not in (EINTR, EWOULDBLOCK, ENOBUFS):
self.fire(SocketError(sock, e))
self._close(sock)
else:
self._buffers[sock].appendleft(data)
@handler("write")
def write(self, sock, data):
if not self._poller.isWriting(sock):
self._poller.addWriter(self, sock)
self._buffers[sock].append(data)
def _accept(self):
try:
newsock, host = self._sock.accept()
if self.secure and HAS_SSL:
newsock = ssl_socket(
newsock,
server_side=True,
keyfile=self.keyfile,
ca_certs=self.ca_certs,
certfile=self.certfile,
cert_reqs=self.cert_reqs,
ssl_version=self.ssl_version,
do_handshake_on_connect=False
)
_do_handshake_for_non_blocking(newsock)
except SSLError as e:
raise
except error as e:
if e.args[0] in (EWOULDBLOCK, EAGAIN):
return
elif e.args[0] == EPERM:
# Netfilter on Linux may have rejected the
# connection, but we get told to try to accept()
# anyway.
return
elif e.args[0] in (EMFILE, ENOBUFS, ENFILE, ENOMEM, ECONNABORTED):
# Linux gives EMFILE when a process is not allowed
# to allocate any more file descriptors. *BSD and
# Win32 give (WSA)ENOBUFS. Linux can also give
# ENFILE if the system is out of inodes, or ENOMEM
# if there is insufficient memory to allocate a new
# dentry. ECONNABORTED is documented as possible on
# both Linux and Windows, but it is not clear
# whether there are actually any circumstances under
# which it can happen (one might expect it to be
# possible if a client sends a FIN or RST after the
# server sends a SYN|ACK but before application code
# calls accept(2), however at least on Linux this
# _seems_ to be short-circuited by syncookies.
return
else:
raise
newsock.setblocking(False)
self._poller.addReader(self, newsock)
self._clients.append(newsock)
self.fire(Connect(newsock, *host))
@handler("_disconnect", filter=True)
def _on_disconnect(self, sock):
self._close(sock)
@handler("_read", filter=True)
def _on_read(self, sock):
if sock == self._sock:
self._accept()
else:
self._read(sock)
@handler("_write", filter=True)
def _on_write(self, sock):
if self._buffers[sock]:
data = self._buffers[sock].popleft()
self._write(sock, data)
if not self._buffers[sock]:
if sock in self._closeq:
self._closeq.remove(sock)
self._close(sock)
elif self._poller.isWriting(sock):
self._poller.removeWriter(sock)
class TCPServer(Server):
socket_family = AF_INET
def _create_socket(self):
sock = socket(self.socket_family, SOCK_STREAM)
sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
sock.setsockopt(IPPROTO_TCP, TCP_NODELAY, 1)
sock.setblocking(False)
sock.bind(self._bind)
sock.listen(self._backlog)
return sock
def parse_bind_parameter(self, bind_parameter):
return parse_ipv4_parameter(bind_parameter)
def parse_ipv4_parameter(bind_parameter):
if type(bind_parameter) is int:
try:
bind = (gethostbyname(gethostname()), bind_parameter)
except gaierror:
bind = ("0.0.0.0", bind_parameter)
elif type(bind_parameter) is str and ":" in bind_parameter:
host, port = bind_parameter.split(":")
port = int(port)
bind = (host, port)
else:
bind = bind_parameter
return bind
def parse_ipv6_parameter(bind_parameter):
if type(bind_parameter) is int:
try:
_, _, _, _, bind \
= getaddrinfo(getfqdn(), bind_parameter, AF_INET6)[0]
except (gaierror, IndexError):
bind = ("::", bind_parameter)
else:
bind = bind_parameter
return bind
class TCP6Server(TCPServer):
socket_family = AF_INET6
def parse_bind_parameter(self, bind_parameter):
return parse_ipv6_parameter(bind_parameter)
class UNIXServer(Server):
def _create_socket(self):
from socket import AF_UNIX
if os.path.exists(self._bind):
os.unlink(self._bind)
sock = socket(AF_UNIX, SOCK_STREAM)
sock.bind(self._bind)
sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
sock.setblocking(False)
sock.listen(self._backlog)
return sock
class UDPServer(Server):
socket_family = AF_INET
def _create_socket(self):
sock = socket(self.socket_family, SOCK_DGRAM)
sock.bind(self._bind)
sock.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
sock.setblocking(False)
return sock
def _close(self, sock):
self._poller.discard(sock)
if sock in self._buffers:
del self._buffers[sock]
try:
sock.shutdown(2)
except error:
pass
try:
sock.close()
except error:
pass
self.fire(Disconnect(sock))
@handler("close", override=True)
def close(self):
self.fire(Closed())
if self._buffers[self._sock] and self._sock not in self._closeq:
self._closeq.append(self._sock)
else:
self._close(self._sock)
def _read(self):
try:
data, address = self._sock.recvfrom(self._bufsize)
if data:
self.fire(Read(address, data)).notify = True
except error as e:
if e.args[0] in (EWOULDBLOCK, EAGAIN):
return
self.fire(SocketError(self._sock, e))
self._close(self._sock)
def _write(self, address, data):
try:
bytes = self._sock.sendto(data, address)
if bytes < len(data):
self._buffers[self._sock].appendleft(data[bytes:])
except error as e:
if e.args[0] in (EPIPE, ENOTCONN):
self._close(self._sock)
else:
self.fire(SocketError(self._sock, e))
@handler("write", override=True)
def write(self, address, data):
if not self._poller.isWriting(self._sock):
self._poller.addWriter(self, self._sock)
self._buffers[self._sock].append((address, data))
@handler("broadcast", override=True)
def broadcast(self, data, port):
self.write(("<broadcast>", port), data)
@handler("_disconnect", filter=True, override=True)
def _on_disconnect(self, sock):
self._close(sock)
@handler("_read", filter=True, override=True)
def _on_read(self, sock):
self._read()
@handler("_write", filter=True, override=True)
def _on_write(self, sock):
if self._buffers[self._sock]:
address, data = self._buffers[self._sock].popleft()
self._write(address, data)
if not self._buffers[self._sock]:
if self._sock in self._closeq:
self._closeq.remove(self._sock)
self._close(self._sock)
elif self._poller.isWriting(self._sock):
self._poller.removeWriter(self._sock)
UDPClient = UDPServer
class UDP6Server(UDPServer):
socket_family = AF_INET6
def parse_bind_parameter(self, bind_parameter):
return parse_ipv6_parameter(bind_parameter)
UDP6Client = UDP6Server
def Pipe(*channels, **kwargs):
"""Create a new full duplex Pipe
Returns a pair of UNIXClient instances connected on either side of
the pipe.
"""
from socket import socketpair
if not channels:
channels = ("a", "b")
s1, s2 = socketpair()
s1.setblocking(False)
s2.setblocking(False)
a = UNIXClient(s1, channel=channels[0], **kwargs)
b = UNIXClient(s2, channel=channels[1], **kwargs)
a._connected = True
b._connected = True
return a, b
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