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#!/usr/bin/python -t
import pwd, os, sys, logging, logging.handlers, string
import asynchat, asyncore, socket, httplib, urlparse
try:
import cStringIO as StringIO
except ImportError:
import StringIO
ENDPOINTS = [
# {'host':'10.1.0.1', 'port':8080},
# {'host':'10.2.2.11', 'port':8081},
('10.3.1.2', 8888),
]
#minimum entity size to start a paralel fetch
MINIMAL_SIZE = 524288
BLOCKSIZE_FETCH = 524288
class Fetcher(asynchat.async_chat):
def __init__(self, reader, proxy, url, header, range, content_length):
print "Fetcher using proxy=%s for url=%s range=%s content_length=%s" % (proxy, url, range, content_length)
self.reader = reader
self.proxy = proxy
self.url = url
self.range = range
self.content_length = content_length
self.pos = range[0]
asynchat.async_chat.__init__(self)
self.set_terminator("\r\n\r\n")
self.http_header = ""
self.is_body = False
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect(proxy)
#XXXshould include original request headers
def handle_connect (self):
print "handle_connect"
self.send("GET http://%s:%s%s HTTP/1.0\r\n" % ( self.url.hostname, self.url.port or 80, self.url.path ))
self.send("Content-Range: bytes %s-%s/%s\r\n" % (self.range[0], self.range[1], self.content_length))
self.send("\r\n")
print "sent request"
def collect_incoming_data(self, data):
if self.is_body:
print "read %s - range_start=%s range_end=%s" % (self.pos, self.range[0], self.range[1])
self.reader.handle_incoming_data(self.pos, data)
self.pos += len(data)
if self.pos >= self.range[1]:
self.reader.finished()
print "finished"
self.close_when_done()
else:
print "get header data"
print data
self.http_header += data
def found_terminator(self):
print "header ends now"
self.set_terminator(None)
self.reader.handle_incoming_http_header(self.http_header)
self.is_body = True
class MultipleProxyReader(object):
def __init__(self, channel, url, header, content_length):
print "MultipleProxyReader url=%s content_length=%s" % (url, content_length)
self.channel = channel
self.url = url
self.header = header
self.content_length = content_length
self.header_sent = False
self.fetch_pos = 0
self.write_pos = 0
self.buffer = ""
self.blocks = dict()
self.next_endpoint = 0
self.finished() #bad-named XXX
def handle_incoming_data(self, pos, data):
print "got body data at pos %s" % pos,
if self.write_pos == pos:
self.write_pos += len(data)
self.channel.push(data)
print " ..sent"
else:
self.blocks[pos] = data
print " ..stored"
self.find_next_data()
def handle_incoming_http_header(self, header):
if self.header_sent:
pass
else:
self.header_sent = True
self.channel.push(header)
self.channel.push("X-Proxy: Magicproxy (superpower activated)\r\n")
self.channel.push("\r\n")
def finished(self):
self.find_next_data()
if self.fetch_pos != self.content_length:
print "start new fetcher"
start = self.fetch_pos
if self.fetch_pos+BLOCKSIZE_FETCH < self.content_length:
self.fetch_pos += BLOCKSIZE_FETCH
else:
self.fetch_pos = self.content_length
range = (start, self.fetch_pos-1)
Fetcher(self, ENDPOINTS[self.next_endpoint], self.url, self.header, range, self.content_length)
self.next_endpoint = (self.next_endpoint+1) % len(ENDPOINTS)
else:
#bin fertig
self.channel.close_when_done()
def find_next_data(self):
if self.write_pos in self.blocks:
data = self.blocks.pop(self.write_pos)
self.channel.push(data)
self.write_pos += len(data)
self.find_next_data()
class HTTPResponseProducer(object):
def __init__(self, resp, amt=512):
self.resp = resp
self.amt = amt
def more(self):
self.resp.read(self.amt)
class HTTPChannel(asynchat.async_chat):
def __init__(self, server, sock, addr):
asynchat.async_chat.__init__(self, sock)
self.server = server
self.set_terminator("\r\n\r\n")
self.request = None
self.data = StringIO.StringIO()
def collect_incoming_data(self, data):
self.data.write(data)
if self.data.tell() > 16384:
self.close_when_done()
def found_terminator(self):
if not self.request:
# parse http header
self.data.seek(0)
self.request = string.split(self.data.readline(), None, 2)
if len(self.request) != 3:
# badly formed request; just shut down
self.close_when_done()
else:
self.server.handle_request(self, self.request[0], self.request[1])
else:
pass # ignore body data, for now
class HTTPProxyServer(asyncore.dispatcher):
def __init__(self):
asyncore.dispatcher.__init__(self)
self.port = 8080
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(("", 8080))
self.listen(5)
def handle_accept(self):
conn, addr = self.accept()
HTTPChannel(self, conn, addr)
def handle_request(self, channel, method, path):
url = urlparse.urlparse(path)
print method, path
if method != "GET" or url.query != "":
#do not handle non-GET or GET with Query (?foo=bla) requests
return self._bypass_request(channel, method, url)
#check for content-length header with a HEAD request
conn = httplib.HTTPConnection(url.hostname, url.port or 80)
conn.request("HEAD", url.path)
resp = conn.getresponse()
content_length = filter(lambda it: it[0] == "content-length", resp.getheaders())
if len( content_length ) == 0:
# no content length given, bypass this request
return self._bypass_request(channel, "GET", url)
else:
content_length = int(content_length[0][1])
if content_length < MINIMAL_SIZE:
return self._bypass_request(channel, "GET", url)
print "start reader"
##XXX
header = (("foo", "bla"))
MultipleProxyReader(channel, url, header, content_length)
def _bypass_request(self, channel, method, url):
print "_bypass request"
#XXX hier sollte nicht proxy gespielt werden sondern
#die daten 1-zu-1 durchgereicht werden.
#Weiterhin sollte sichergestellt werden, dass die requests
#zu Host X1 immer ueber Proxy Y1 geroutet werden
# etwa proxy=proxies[ stuff(hostname) % len(proxies) ]
conn = httplib.HTTPConnection(url.hostname, url.port or 80)
conn.request(method, url.path)
resp = conn.getresponse()
channel.push("HTTP/1.0 200 OK\r\nX-Proxy: Magicproxy (superpower disabled)\r\n")
channel.push( "\r\n".join(map(lambda k: "%s: %s" % (k[0],k[1]), resp.getheaders())) )
channel.push("\r\n\r\n")
channel.push_with_producer( HTTPResponseProducer(resp) )
channel.close_when_done()
if __name__ == "__main__":
proxy = HTTPProxyServer()
asyncore.loop()
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