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"""
Testbed for figuring out how to write asynchronous HTTPS code.
$Id$
Copyright (C) 2009 Internet Systems Consortium ("ISC")
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
"""
# Command that may be useful for testing server side of this:
#
# lynx -post_data -mime_header -source http://127.0.0.1:8000/
import sys, os, time, socket, fcntl, asyncore, asynchat, getopt, email, traceback
class http_message(object):
@classmethod
def parse_from_wire(cls, headers):
self = cls()
headers = headers.split("\r\n")
self.parse_first_line(*headers.pop(0).split(None, 2))
for i in xrange(len(headers) - 2, -1, -1):
if headers[i + 1][0].isspace():
headers[i] += headers[i + 1]
del headers[i + 1]
headers = [h.split(":", 1) for h in headers]
self.headers = dict((k.lower(), v) for (k,v) in headers)
return self
def format(self):
s = self.format_first_line()
if self.body is not None:
assert isinstance(self.body, str)
self.headers["content-length"] = len(self.body)
for kv in self.headers.iteritems():
s += "%s: %s\r\n" % kv
s += "\r\n"
if self.body is not None:
s += self.body
return s
def __str__(self):
return self.format()
def parse_version(self, version):
if version[:5] != "HTTP/":
raise RuntimeError, "Couldn't parse version %s" % version
self.version = tuple(int(i) for i in version[5:].split("."))
class http_request(http_message):
def __init__(self, cmd = None, path = None, version = (1,0), body = None, headers = None):
if cmd is not None and cmd.upper() != "POST" and body is not None:
raise RuntimeError
self.cmd = cmd
self.path = path
self.version = version
self.body = body
self.headers = {} if headers is None else headers
def parse_first_line(self, cmd, path, version):
self.parse_version(version)
self.cmd = cmd.upper()
self.path = path
def format_first_line(self):
return "%s %s HTTP/%d.%d\r\n" % (self.cmd, self.path, self.version[0], self.version[1])
class http_response(http_message):
def __init__(self, code = None, msg = None, version = (1,0), body = None, headers = None):
self.code = code
self.msg = msg
self.version = version
self.body = body
self.headers = {} if headers is None else headers
def parse_first_line(self, version, code, msg):
self.parse_version(version)
self.code = int(code)
self.msg = msg
def format_first_line(self):
return "HTTP/%d.%d %s %s\r\n" % (self.version[0], self.version[1], self.code, self.msg)
class http_stream(asynchat.async_chat):
def __init__(self, conn = None):
asynchat.async_chat.__init__(self, conn = conn)
self.buffer = []
self.set_terminator("\r\n\r\n")
def reading_headers(self):
return isinstance(self.get_terminator(), str)
def reading_body(self):
return isinstance(self.get_terminator(), int)
def collect_incoming_data(self, data):
"""Buffer the data"""
self.buffer.append(data)
def get_buffer(self):
val = "".join(self.buffer)
self.buffer = []
return val
def found_terminator(self):
if self.reading_headers():
return self.handle_headers()
if self.reading_body():
return self.handle_body()
raise RuntimeError
def handle_body(self):
self.msg.body = self.get_buffer()
assert len(self.msg.body) == int(self.msg.headers["content-length"])
self.handle_message()
def handle_error(self):
print traceback.format_exc()
asyncore.close_all()
class http_server(http_stream):
def handle_headers(self):
self.msg = http_request.parse_from_wire(self.get_buffer())
if self.msg.cmd == "POST":
self.set_terminator(int(self.msg.headers["content-length"]))
else:
self.handle_message()
def handle_message(self):
print self.msg
self.push(http_response(code = 200, msg = "OK", body = self.msg.format(), headers = { "content-type" : "text/plain" }).format())
self.close_when_done()
class http_client(http_stream):
def handle_headers(self):
self.msg = http_response.parse_from_wire(self.get_buffer())
self.set_terminator(int(self.msg.headers["content-length"]))
def handle_message(self):
print self.msg
def handle_connect(self):
pass
class http_listener(asyncore.dispatcher):
def __init__(self):
asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
self.bind(("", 8000))
self.listen(5)
def handle_accept(self):
server = http_server(self.accept()[0])
def handle_error(self):
print traceback.format_exc()
asyncore.close_all()
assert len(sys.argv) in (1, 2)
if len(sys.argv) == 1:
listener = http_listener()
else:
client = http_client()
client.create_socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect(("", 8000))
client.push(http_request(cmd = sys.argv[1], path = "/", body = "Hi, Mom!\r\n", headers = { "content-type" : "text/plain" }).format())
asyncore.loop()
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