396 lines
12 KiB
Python
396 lines
12 KiB
Python
"""Async sockets, build on top of Sam Rushing's excellent async library"""
|
|
|
|
import asyncore
|
|
import socket
|
|
from socket import AF_INET, SOCK_STREAM
|
|
import string
|
|
import cStringIO
|
|
import mimetools
|
|
import httplib
|
|
|
|
|
|
__version__ = "0.9"
|
|
__author__ = "jvr"
|
|
|
|
BUFSIZE = 512
|
|
|
|
VERBOSE = 1
|
|
|
|
class Server(asyncore.dispatcher):
|
|
|
|
"""Generic asynchronous server class"""
|
|
|
|
def __init__(self, port, handler_class, backlog=1, host=""):
|
|
"""arguments:
|
|
- port: the port to listen to
|
|
- handler_class: class to handle requests
|
|
- backlog: backlog queue size (optional) (don't fully understand, see socket docs)
|
|
- host: host name (optional: can be empty to use default host name)
|
|
"""
|
|
if VERBOSE:
|
|
print "Starting", self.__class__.__name__
|
|
self.handler_class = handler_class
|
|
asyncore.dispatcher.__init__(self)
|
|
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self.bind((host, port))
|
|
self.listen(backlog)
|
|
|
|
def handle_accept(self):
|
|
conn, addr = self.accept()
|
|
if VERBOSE:
|
|
print 'Incoming Connection from %s:%d' % addr
|
|
self.handler_class(conn)
|
|
|
|
|
|
class ProxyServer(Server):
|
|
|
|
"""Generic proxy server class"""
|
|
|
|
def __init__(self, port, handler_class, proxyaddr=None, closepartners=0):
|
|
"""arguments:
|
|
- port: the port to listen to
|
|
- handler_class: proxy class to handle requests
|
|
- proxyaddr: a tuple containing the address and
|
|
port of a remote host to connect to (optional)
|
|
- closepartners: boolean, specifies whether we should close
|
|
all proxy connections or not (optional). http seems to *not*
|
|
want this, but telnet does...
|
|
"""
|
|
Server.__init__(self, port, handler_class, 1, "")
|
|
self.proxyaddr = proxyaddr
|
|
self.closepartners = closepartners
|
|
|
|
def handle_accept(self):
|
|
conn, addr = self.accept()
|
|
if VERBOSE:
|
|
print 'Incoming Connection from %s:%d' % addr
|
|
self.handler_class(conn, self.proxyaddr, closepartner=self.closepartners)
|
|
|
|
|
|
class Connection(asyncore.dispatcher):
|
|
|
|
"""Generic connection class"""
|
|
|
|
def __init__(self, sock_or_address=None, readfunc=None, terminator=None):
|
|
"""arguments:
|
|
- sock_or_address: either a socket, or a tuple containing the name
|
|
and port number of a remote host
|
|
- readfunc: callback function (optional). Will be called whenever
|
|
there is some data available, or when an appropraite terminator
|
|
is found.
|
|
- terminator: string which specifies when a read is complete (optional)"""
|
|
self._out_buffer = ""
|
|
self._in_buffer = ""
|
|
self.readfunc = readfunc
|
|
self.terminator = terminator
|
|
asyncore.dispatcher.__init__(self)
|
|
if hasattr(sock_or_address, "fileno"):
|
|
self.set_socket(sock_or_address)
|
|
else:
|
|
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
sock.setblocking(0)
|
|
self.set_socket(sock)
|
|
if sock_or_address:
|
|
self.connect(sock_or_address)
|
|
|
|
# public methods
|
|
def send(self, data):
|
|
self._out_buffer = self._out_buffer + data
|
|
|
|
def recv(self, bytes=-1):
|
|
if bytes == -1:
|
|
bytes = len(self._in_buffer)
|
|
data = self._in_buffer[:bytes]
|
|
self._in_buffer = self._in_buffer[bytes:]
|
|
return data
|
|
|
|
def set_terminator(self, terminator):
|
|
self.terminator = terminator
|
|
|
|
# override this if you want to control the incoming data stream
|
|
def handle_incoming_data(self, data):
|
|
if self.readfunc:
|
|
if self.terminator:
|
|
self._in_buffer = self._in_buffer + data
|
|
pos = string.find(self._in_buffer, self.terminator)
|
|
if pos < 0:
|
|
return
|
|
data = self._in_buffer[:pos]
|
|
self._in_buffer = self._in_buffer[pos + len(self.terminator):]
|
|
self.readfunc(data)
|
|
else:
|
|
self.readfunc(self._in_buffer + data)
|
|
self._in_buffer = ""
|
|
else:
|
|
self._in_buffer = self._in_buffer + data
|
|
|
|
# internal muck
|
|
def handle_read(self):
|
|
data = asyncore.dispatcher.recv(self, BUFSIZE)
|
|
if data:
|
|
if VERBOSE > 2:
|
|
print "incoming -> %x %r" % (id(self), data)
|
|
self.handle_incoming_data(data)
|
|
|
|
def handle_write(self):
|
|
if self._out_buffer:
|
|
sent = self.socket.send(self._out_buffer[:BUFSIZE])
|
|
if VERBOSE > 2:
|
|
print "outgoing -> %x %r" % (id(self), self._out_buffer[:sent])
|
|
self._out_buffer = self._out_buffer[sent:]
|
|
|
|
def close(self):
|
|
if self.readfunc and self._in_buffer:
|
|
self.readfunc(self._in_buffer)
|
|
self._in_buffer = ""
|
|
#elif VERBOSE > 1 and self._in_buffer:
|
|
# print "--- there is unread data: %r", (self._in_buffer,)
|
|
asyncore.dispatcher.close(self)
|
|
|
|
def handle_close(self):
|
|
self.close()
|
|
|
|
def handle_connect(self):
|
|
pass
|
|
|
|
|
|
class ConnectionUI:
|
|
|
|
"""Glue to let a connection tell things to the UI in a standardized way.
|
|
|
|
The protocoll defines four functions, which the connection will call:
|
|
|
|
def settotal(int total): gets called when the connection knows the data size
|
|
def setcurrent(int current): gets called when some new data has arrived
|
|
def done(): gets called when the transaction is complete
|
|
def error(type, value, tb): gets called wheneven an error occurred
|
|
"""
|
|
|
|
def __init__(self, settotal_func, setcurrent_func, done_func, error_func):
|
|
self.settotal = settotal_func
|
|
self.setcurrent = setcurrent_func
|
|
self.done = done_func
|
|
self.error = error_func
|
|
|
|
|
|
class HTTPError(socket.error): pass
|
|
|
|
|
|
class HTTPClient(Connection, httplib.HTTP):
|
|
|
|
"""Asynchronous HTTP connection"""
|
|
|
|
def __init__(self, (host, port), datahandler, ui=None):
|
|
Connection.__init__(self, (host, port))
|
|
self.datahandler = datahandler
|
|
self.ui = ui
|
|
self.buf = ""
|
|
self.doneheaders = 0
|
|
self.done = 0
|
|
self.headers = None
|
|
self.length = None
|
|
self.pos = 0
|
|
|
|
def getreply(self):
|
|
raise TypeError, "getreply() is not supported in async HTTP connection"
|
|
|
|
def handle_incoming_data(self, data):
|
|
assert not self.done
|
|
if not self.doneheaders:
|
|
self.buf = self.buf + data
|
|
pos = string.find(self.buf, "\r\n\r\n")
|
|
if pos >= 0:
|
|
self.handle_reply(self.buf[:pos+4])
|
|
length = self.headers.getheader("Content-Length")
|
|
if length is not None:
|
|
self.length = int(length)
|
|
if self.ui is not None:
|
|
self.ui.settotal(self.length)
|
|
else:
|
|
self.length = -1
|
|
self.doneheaders = 1
|
|
self.handle_data(self.buf[pos+4:])
|
|
self.buf = ""
|
|
else:
|
|
self.handle_data(data)
|
|
|
|
def handle_reply(self, data):
|
|
f = cStringIO.StringIO(data)
|
|
ver, code, msg = string.split(f.readline(), None, 2)
|
|
code = int(code)
|
|
msg = string.strip(msg)
|
|
if code <> 200:
|
|
# Hm, this is what *I* need, but probably not correct...
|
|
raise HTTPError, (code, msg)
|
|
self.headers = mimetools.Message(f)
|
|
|
|
def handle_data(self, data):
|
|
self.pos = self.pos + len(data)
|
|
if self.ui is not None:
|
|
self.ui.setcurrent(self.pos)
|
|
self.datahandler(data)
|
|
if self.pos >= self.length:
|
|
self.datahandler("")
|
|
self.done = 1
|
|
if self.ui is not None:
|
|
self.ui.done()
|
|
|
|
def handle_error(self, type, value, tb):
|
|
if self.ui is not None:
|
|
self.ui.error(type, value, tb)
|
|
else:
|
|
Connection.handle_error(self, type, value, tb)
|
|
|
|
def log(self, message):
|
|
if VERBOSE:
|
|
print 'LOG:', message
|
|
|
|
|
|
class PyMessage:
|
|
|
|
def __init__(self):
|
|
self._buf = ""
|
|
self._len = None
|
|
self._checksum = None
|
|
|
|
def feed(self, data):
|
|
self._buf = self._buf + data
|
|
if self._len is None:
|
|
if len(self._buf) >= 8:
|
|
import struct
|
|
self._len, self._checksum = struct.unpack("ll", self._buf[:8])
|
|
self._buf = self._buf[8:]
|
|
if self._len is not None:
|
|
if len(self._buf) >= self._len:
|
|
import zlib
|
|
data = self._buf[:self._len]
|
|
leftover = self._buf[self._len:]
|
|
self._buf = None
|
|
assert self._checksum == zlib.adler32(data), "corrupt data"
|
|
self.data = data
|
|
return 1, leftover
|
|
else:
|
|
return 0, None
|
|
else:
|
|
return 0, None
|
|
|
|
|
|
class PyConnection(Connection):
|
|
|
|
def __init__(self, sock_or_address):
|
|
Connection.__init__(self, sock_or_address)
|
|
self.currentmessage = PyMessage()
|
|
|
|
def handle_incoming_data(self, data):
|
|
while data:
|
|
done, data = self.currentmessage.feed(data)
|
|
if done:
|
|
import cPickle
|
|
self.handle_object(cPickle.loads(self.currentmessage.data))
|
|
self.currentmessage = PyMessage()
|
|
|
|
def handle_object(self, object):
|
|
print 'unhandled object:', repr(object)
|
|
|
|
def send(self, object):
|
|
import cPickle, zlib, struct
|
|
data = cPickle.dumps(object, 1)
|
|
length = len(data)
|
|
checksum = zlib.adler32(data)
|
|
data = struct.pack("ll", length, checksum) + data
|
|
Connection.send(self, data)
|
|
|
|
|
|
class Echo(Connection):
|
|
|
|
"""Simple echoing connection: it sends everything back it receives."""
|
|
|
|
def handle_incoming_data(self, data):
|
|
self.send(data)
|
|
|
|
|
|
class Proxy(Connection):
|
|
|
|
"""Generic proxy connection"""
|
|
|
|
def __init__(self, sock_or_address=None, proxyaddr=None, closepartner=0):
|
|
"""arguments:
|
|
- sock_or_address is either a socket or a tuple containing the
|
|
name and port number of a remote host
|
|
- proxyaddr: a tuple containing a name and a port number of a
|
|
remote host (optional).
|
|
- closepartner: boolean, specifies whether we should close
|
|
the proxy connection (optional)"""
|
|
|
|
Connection.__init__(self, sock_or_address)
|
|
self.other = None
|
|
self.proxyaddr = proxyaddr
|
|
self.closepartner = closepartner
|
|
|
|
def close(self):
|
|
if self.other:
|
|
other = self.other
|
|
self.other = None
|
|
other.other = None
|
|
if self.closepartner:
|
|
other.close()
|
|
Connection.close(self)
|
|
|
|
def handle_incoming_data(self, data):
|
|
if not self.other:
|
|
# pass data for possible automatic remote host detection
|
|
# (see HTTPProxy)
|
|
data = self.connectproxy(data)
|
|
self.other.send(data)
|
|
|
|
def connectproxy(self, data):
|
|
other = self.__class__(self.proxyaddr, closepartner=self.closepartner)
|
|
self.other = other
|
|
other.other = self
|
|
return data
|
|
|
|
|
|
class HTTPProxy(Proxy):
|
|
|
|
"""Simple, useless, http proxy. It figures out itself where to connect to."""
|
|
|
|
def connectproxy(self, data):
|
|
if VERBOSE:
|
|
print "--- proxy request", repr(data)
|
|
addr, data = de_proxify(data)
|
|
other = Proxy(addr)
|
|
self.other = other
|
|
other.other = self
|
|
return data
|
|
|
|
|
|
# helper for HTTPProxy
|
|
def de_proxify(data):
|
|
import re
|
|
req_pattern = "GET http://([a-zA-Z0-9-_.]+)(:([0-9]+))?"
|
|
m = re.match(req_pattern, data)
|
|
host, dummy, port = m.groups()
|
|
if not port:
|
|
port = 80
|
|
else:
|
|
port = int(port)
|
|
# change "GET http://xx.xx.xx/yy" into "GET /yy"
|
|
data = re.sub(req_pattern, "GET ", data)
|
|
return (host, port), data
|
|
|
|
|
|
# if we're running "under W", let's register the socket poller to the event loop
|
|
try:
|
|
import W
|
|
except:
|
|
pass
|
|
else:
|
|
W.getapplication().addidlefunc(asyncore.poll)
|
|
|
|
|
|
## testing muck
|
|
#testserver = Server(10000, Connection)
|
|
#echoserver = Server(10007, Echo)
|
|
#httpproxyserver = Server(8088, HTTPProxy, 5)
|
|
#asyncore.close_all()
|