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