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# $Id: http_client.py 271 2004-10-09 10:50:59Z fredrik $
# a simple asynchronous http client (based on SimpleAsyncHTTP.py from
# "Python Standard Library" by Fredrik Lundh, O'Reilly 2001)
#
# HTTP/1.1 and GZIP support added in January 2003 by Fredrik Lundh.
#
# changes:
# 2004-08-26 fl unified http callback
# 2004-10-09 fl factored out gzip_consumer support
#
# Copyright (c) 2001-2004 by Fredrik Lundh. All rights reserved.
#
from __future__ import absolute_import
import asyncore
import socket, string, time, sys
import StringIO
import mimetools, urlparse, urllib
try:
from gzip_consumer import GzipConsumer
except ImportError:
pass
##
# Close connection. Request handlers can raise this exception to
# indicate that the connection should be closed.
class CloseConnection(Exception):
pass
##
# Redirect connection. Request handlers can raise this exception to
# indicate that the a new request should be issued.
class Redirect(CloseConnection):
def __init__(self, location):
self.location = location
##
# Asynchronous HTTP/1.1 client.
class async_http(asyncore.dispatcher_with_send):
# asynchronous http client
user_agent = "http_client.py 1.2 (http://effbot.org/zone)"
http_version = "1.1"
proxies = urllib.getproxies()
def __init__(self, uri, consumer, extra_headers=None):
asyncore.dispatcher_with_send.__init__(self)
# turn the uri into a valid request
scheme, host, path, params, query, fragment = urlparse.urlparse(uri)
# use origin host
self.host = host
# get proxy settings, if any
proxy = self.proxies.get(scheme)
if proxy:
scheme, host, x, x, x, x = urlparse.urlparse(proxy)
assert scheme == "http", "only supports HTTP requests (%s)" % scheme
if not path:
path = "/"
if params:
path = path + ";" + params
if query:
path = path + "?" + query
if proxy:
path = scheme + "://" + self.host + path
self.path = path
# get port number
try:
host, port = host.split(":", 1)
port = int(port)
except (TypeError, ValueError):
port = 80 # default port
self.consumer = consumer
self.status = None
self.header = None
self.bytes_in = 0
self.bytes_out = 0
self.content_type = None
self.content_length = None
self.content_encoding = None
self.transfer_encoding = None
self.data = ""
self.chunk_size = None
self.timestamp = time.time()
self.extra_headers = extra_headers
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
try:
self.connect((host, port))
except socket.error:
self.consumer.http(0, self, sys.exc_info())
def handle_connect(self):
# connection succeeded
request = [
"GET %s HTTP/%s" % (self.path, self.http_version),
"Host: %s" % self.host,
]
if GzipConsumer:
request.append("Accept-Encoding: gzip")
if self.extra_headers:
request.extend(self.extra_headers)
# make sure to include a user agent
for header in request:
if string.lower(header).startswith("user-agent:"):
break
else:
request.append("User-Agent: %s" % self.user_agent)
request = string.join(request, "\r\n") + "\r\n\r\n"
self.send(request)
self.bytes_out = self.bytes_out + len(request)
def handle_expt(self):
# connection failed (windows); notify consumer
if sys.platform == "win32":
self.close()
self.consumer.http(0, self)
def handle_read(self):
# handle incoming data
data = self.recv(2048)
self.data = self.data + data
self.bytes_in = self.bytes_in + len(data)
while self.data:
if not self.header:
# check if we've seen a full header
header = self.data.split("\r\n\r\n", 1)
if len(header) <= 1:
return
header, self.data = header
# parse header
fp = StringIO.StringIO(header)
self.status = fp.readline().split(" ", 2)
self.header = mimetools.Message(fp)
# get http headers
self.content_type = self.header.get("content-type")
try:
self.content_length = int(
self.header.get("content-length")
)
except (ValueError, TypeError):
self.content_length = None
self.transfer_encoding = self.header.get("transfer-encoding")
self.content_encoding = self.header.get("content-encoding")
if self.content_encoding == "gzip":
# FIXME: report error if GzipConsumer is not available
self.consumer = GzipConsumer(self.consumer)
try:
self.consumer.http(1, self)
except Redirect, v:
# redirect
if v.location:
do_request(
v.location, self.consumer, self.extra_headers
)
self.close()
return
except CloseConnection:
self.close()
return
if self.transfer_encoding == "chunked" and self.chunk_size is None:
# strip off leading whitespace
if self.data.startswith("\r\n"):
self.data = self.data[2:]
chunk_size = self.data.split("\r\n", 1)
if len(chunk_size) <= 1:
return
chunk_size, self.data = chunk_size
try:
self.chunk_size = int(chunk_size, 16)
if self.chunk_size <= 0:
raise ValueError
except ValueError:
return self.handle_close()
if not self.data:
return
data = self.data
self.data = ""
chunk_size = self.chunk_size or len(data)
if chunk_size < len(data):
self.data = data[chunk_size:]
data = data[:chunk_size]
self.chunk_size = None
else:
self.chunk_size = chunk_size - len(data)
if self.chunk_size <= 0:
self.chunk_size = None
if data:
self.consumer.feed(data)
if self.content_length:
self.content_length -= chunk_size
if self.content_length <= 0:
return self.handle_close()
def handle_close(self):
self.consumer.close()
self.close()
def handle_error(self):
self.consumer.http(0, self, sys.exc_info())
self.close()
def do_request(uri, consumer, extra_headers=None):
return async_http(uri, consumer, extra_headers)
if __name__ == "__main__":
class dummy_consumer:
def feed(self, data):
# print "feed", repr(data)
print "feed", repr(data[:20]), repr(data[-20:]), len(data)
def close(self):
print "close"
def http(self, ok, connection, **args):
print ok, connection, args
print "status", connection.status
print "header", connection.header
try:
url = sys.argv[1]
except IndexError:
url = "http://www.cnn.com/"
do_request(url, dummy_consumer())
asyncore.loop()
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