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#!/usr/bin/python -t
import os, sys, string, time, md5, random
import asynchat, asyncore, socket, httplib, urlparse
from heapq import heappush, heappop
import cStringIO as StringIO
ENDPOINTS = [
('10.2.2.11', 8888),
# ('10.3.1.2', 8888),
('10.1.1.156', 8888),
]
kB = 1024
#minimum entity size to start a paralel fetch
THRESHOLD = 512 * kB
#first fetch-range blocksize
INIT_BLOCKSIZE = 512 * kB
#lower bound of fetch-range blocksize optimization
MIN_BLOCKSIZE = 512 * kB
#time each fetcher spent on his range, calculated using
#speed measured while using INIT_BLOCKSIZE
TIME_SLICE = 5
#start a new fetcher on a endpoint X-bytes before the
#old one finished
FETCHER_JUMPSTART = 32 * kB
#################
class Fetcher(asynchat.async_chat):
def __init__(self, reader, proxy, url, headers, range):
self.reader = reader
self.proxy = proxy
self.url = url
self.headers = headers
self.range = range
self.pos = (self.range[0] != -1) and self.range[0] or 0
self.start_time = 0
self.stop_time = 0
self.http_status = ""
self.http_header = StringIO.StringIO()
self.state = 0 #0=status, 1=header, 2=body
asynchat.async_chat.__init__(self)
self.set_terminator("\r\n")
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect(self.proxy)
def __str__(self):
return "<Fetcher proxy=%s url=%s range=%s" % (self.proxy, urlparse.urlunparse(self.url), self.range)
def handle_connect (self):
print self, "Start"
self.send("GET http://%s:%s%s HTTP/1.0\r\n" % ( self.url.hostname, self.url.port or 80, self.url.path ))
for key in filter(lambda k: k not in ("range"), self.headers.keys()): #send origin request headers
self.send("%s: %s\r\n" % (key, self.headers[key]))
if self.range != (-1,-1):
self.send("Range: bytes=%s-%s\r\n" % (self.range[0], self.range[1]))
self.send("\r\n")
self.start_time = time.time()
def time(self):
if self.stop_time == 0:
return time.time() - self.start_time
else:
return self.stop_time - self.start_time
def speed(self):
return (self.pos - self.range[0]) / self.time()
def collect_incoming_data(self, data):
if self.state==2: #body
length = len(data)
self.reader.handle_incoming_data(self, data, length)
self.pos += length
if self.range != (-1,-1) and self.pos >= self.range[1]:
self.stop_time = time.time()
print self, "finished with %s kB/s" % (self.speed() / 1024)
#make sure the next fetcher will be started
self.reader.handle_incoming_data(self)
self.close()
elif self.state ==1: #header
self.http_header.write( data )
else: #status
self.http_status += data
def found_terminator(self):
if self.state == 0: #got status-line
self.state = 1
self.set_terminator("\r\n\r\n")
elif self.state == 1: #got headers
self.state = 2
self.set_terminator(None)
self.reader.handle_incoming_http_header(self, self.http_header)
class MagicHTTPProxyClient(object):
def __init__(self, channel, url, header):
self.channel = channel
self.url = url
self.header = header
self.content_length = -1
self.header_sent = False
self.fetch_pos = 0
self.write_pos = 0
self.buffer = ""
self.blocks = list()
self.fetchers = list()
print self, "New Instance"
proxy = ENDPOINTS[ random.randint(0, len(ENDPOINTS)-1) ]
self.fetchers.append( Fetcher(self, proxy, self.url, self.header, (-1,-1)) )
def __str__(self):
return "<MagicHTTPProxyClient url=%s content_length=%s>" % (urlparse.urlunparse(self.url), self.content_length)
def handle_incoming_data(self, fetcher, data=None, length=0):
if not data:
#fetcher is done, remove from list
self.fetchers = filter(lambda f: f != fetcher, self.fetchers)
else:
heappush(self.blocks, (fetcher.pos, data, length))
if not self.channel.connected:
print self, "request side closed the connection"
return
if fetcher.range != (-1,-1) \
and fetcher.range[1] - fetcher.pos < FETCHER_JUMPSTART \
and self.fetch_pos + 1 < self.content_length and self.channel.connected \
and len( filter(lambda f: f.proxy == fetcher.proxy, self.fetchers) ) < 2:
#Start a new fetcher on this line if this fetchers is X-Bytes before finished his job
blocksize = min(int(TIME_SLICE * fetcher.speed()), MIN_BLOCKSIZE)
fetch_range = self.next_range(blocksize)
print "Start new Fetcher, bs=%s range=%s" % (blocksize,fetch_range)
self.fetchers.append( Fetcher(self, fetcher.proxy, self.url, self.header, fetch_range) )
buf = ""
while len(self.blocks)>0 and min(self.blocks)[0] == self.write_pos:
item = heappop(self.blocks)
buf += item[1]
self.write_pos += item[2]
if len(self.blocks)>0:
print "missed: %s => %s" % (self.write_pos, min(self.blocks)[0])
if buf != "":
self.channel.push(buf)
if self.write_pos + 1 >= self.content_length:
print self, "job done %s blocks left" % len(self.blocks)
self.channel.close_when_done()
def next_range(self, suggested_blocksize):
assert self.content_length != -1
start = self.fetch_pos
self.fetch_pos = min(self.fetch_pos + suggested_blocksize, self.content_length)
return (start, self.fetch_pos-1)
def handle_incoming_http_header(self, fetcher, header):
if self.header_sent:
pass
else:
self.header_sent = True
# Sends header from first response
header.seek(0)
headers = httplib.HTTPMessage(header)
content_length = filter(lambda i: i == "content-length", headers.dict.keys())
if len(content_length) == 1:
content_length = int(headers.dict["content-length"])
if content_length >= THRESHOLD:
self.content_length = content_length
fetcher.range = self.next_range(INIT_BLOCKSIZE)
for proxy in filter(lambda p: fetcher.proxy != p, ENDPOINTS):
if self.fetch_pos == self.content_length -1:
break
self.fetchers.append(Fetcher( self, proxy, self.url, self.header, self.next_range(INIT_BLOCKSIZE)))
else:
content_length = None
buf = "HTTP/1.1 200 OK\r\n"
for key in filter(lambda k: k not in ("content-range", "content-length"), headers.dict.keys()):
buf += "%s: %s\r\n" % (key, headers.dict[key])
if content_length:
buf += "Content-Length: %s\r\n" % content_length
buf += "Content-Range: bytes %s-%s/%s\r\n" % (0, content_length-1, content_length)
buf += "X-Proxy: Magicproxy (superpower activated)\r\n"
buf += "\r\n"
self.channel.push(buf)
class HTTPChannel(asynchat.async_chat):
def __init__(self, server, sock, addr):
self.server = server
self.data = StringIO.StringIO()
self.request = None
asynchat.async_chat.__init__(self, sock)
self.set_terminator("\r\n\r\n")
def handle_close(self):
self.close()
def collect_incoming_data(self, data):
self.data.write(data)
if self.data.tell() > 16384:
self.close_when_done()
def found_terminator(self):
# 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.set_terminator(None)
headers = httplib.HTTPMessage(self.data).dict
self.server.handle_request(self, self.request[0], self.request[1], headers)
class HTTPProxyServer(asyncore.dispatcher):
def __init__(self):
self.port = 8080
asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(("", 8080))
self.listen(15)
def __str__(self):
return "<HTTPProxyServer port=%s>" % self.port
def handle_accept(self):
conn, addr = self.accept()
HTTPChannel(self, conn, addr)
def handle_request(self, channel, method, path, headers):
url = urlparse.urlparse(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, headers)
else:
MagicHTTPProxyClient(channel, url, headers)
def _bypass_request(self, channel, method, url, headers):
proxy = ENDPOINTS[ int( md5.md5(url.hostname).hexdigest(),16 ) % len(ENDPOINTS) ]
print self, "_bypass request via %s: %s %s" % (proxy, method, urlparse.urlunparse(url))
HTTPProxyClient(proxy, channel, method, url, headers)
if __name__ == "__main__":
proxy = HTTPProxyServer()
asyncore.loop()
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