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server.py
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server.py
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# -*- coding: utf-8 -*-
"""HTTP server"""
from __future__ import absolute_import, print_function
import sys
from ssl import SSLError
from time import time
from traceback import format_exception_only, format_tb
from httoop import INTERNAL_SERVER_ERROR, Request, Response, StatusException
from httoop.semantic.response import ComposedResponse
from circuits import BaseComponent, Event, handler, reprhandler
from circuits.http.events import (
HTTPError, request as RequestEvent, response as ResponseEvent, routing as RoutingEvent,
)
from circuits.http.server._state import State
from circuits.http.wrapper import Client, Server
from circuits.net.events import close, read, write
from circuits.net.utils import is_ssl_handshake
_ResponseStart = type('response.start', (Event,), {})
_ResponseBody = type('response.body', (Event,), {})
_ResponseComplete = type('response.complete', (Event,), {})
class HTTP(BaseComponent):
"""HTTP Server Protocol Component
Parse incoming HTTP messages and send a response message.
"""
channel = 'http'
connection_idle_timeout = 30.0
def __init__(self, channel=channel):
super(HTTP, self).__init__(channel=channel)
self._buffers = {}
@handler("read")
def _on_read(self, event, socket, data):
"""parse data and fire request event"""
server = Server(event.value.manager)
if socket not in self._buffers:
self._buffers[socket] = State(self, socket, server)
if not server.secure and is_ssl_handshake(data):
if self.ssl_through_http(socket) is NotImplemented:
return
if self._buffers[socket].tunnel:
return # TODO: find a circuits way for this
http = self._buffers[socket].parser
try:
requests = tuple(http.parse(data))
except StatusException as httperror:
client = Client(http.request, http.response, socket, server)
self._add_client(client)
self.fire(HTTPError(client, httperror))
# TODO: wait for HTTPError event to be processed and close the connection
except BaseException:
client = Client(Request(), Response(), socket, server)
self._add_client(client)
self.fire(self.default_internal_server_error(client, sys.exc_info()))
raise
else:
for client in requests:
self._add_client(client)
client.events.routing = self.fire(RoutingEvent(client)).event # TODO: fire routing event in on_headers_complete and wait for sending the request event until the request is parsed completely
def _add_client(self, client):
self._buffers[client.socket].requests.append(client)
def on_headers_complete(self, client):
pass
@handler('read', 'connect', priority=-0.1)
def _timeout(self, *args):
self.fire(Event.create('timeout.check', args[0]))
@handler('timeout.check')
def _check_timeout(self, socket):
try:
from circuits import sleep
except ImportError:
return # wrong circuits version
try:
state = self._buffers[socket]
except KeyError:
# FIXME: does not exists yet on "connect"
return # disconnected
if state.tunnel:
return
timeout = state.timeout
if timeout is not None:
timeout.abort = True
timeout.expiry = time()
timeout = sleep(self.connection_idle_timeout)
timeout.abort = False
state.timeout = timeout
yield timeout
if timeout.abort or state.tunnel:
return
if all(client.done for client in state.requests):
self.fire(close(socket))
# else:
# TODO: implement close after last response
@handler("response")
def _on_response(self, client):
"""Send respond message to client's socket"""
socket = client.socket
try:
state = self._buffers[socket]
except KeyError: # client disconnected before receiving answer
self._premature_client_disconnect(client)
return
if client in state.responses:
raise RuntimeError('Got multiple response events for client: %r' % (client,))
state.responses.add(client)
pipeline = state.requests
if not pipeline or pipeline[0] is not client:
return # a previous request is unfinished
self.fire(_ResponseStart(client))
@handler('response.start')
def _on_response_start(self, client):
request, response = client
socket = client.socket
try:
state = self._buffers[socket]
except KeyError: # client disconnected before receiving answer
self._premature_client_disconnect(client)
return
state.response_started.add(client)
if client.response.status == 101 or client.request.method == u'CONNECT' and client.response.status.successful:
state.tunnel = True
# prepare for sending
composed = ComposedResponse(response, request)
composed.prepare()
state.composed[client] = composed
# send HTTP response status line and headers
bresponse = bytes(response)
bheaders = bytes(response.headers)
self.fire(write(socket, b'%s%s' % (bresponse, bheaders)))
self.fire(_ResponseBody(client))
@handler("response.body")
def _on_response_body(self, client):
"""stream the response output"""
response = client.response
socket = client.socket
try:
data = next(response.body)
except StopIteration:
response.body.close()
# if response.close: # conflicts with pipelining?
# self.fire(close(socket))
client.done = True
self.fire(_ResponseComplete(client))
else:
self.fire(write(socket, data))
self.fire(_ResponseBody(client))
@handler('response.complete')
def _on_response_complete(self, client):
socket = client.socket
try:
state = self._buffers[socket]
except KeyError: # client disconnected
self._premature_client_disconnect(client)
return
pipeline = state.requests
assert pipeline and pipeline[0] is client
pipeline.pop(0)
try:
client_ = pipeline[0]
except IndexError: # no further request
if state.composed[client].close: # FIXME: composed
self.fire(close(socket))
else:
if client_ in state.responses and client_ not in state.response_started:
self.fire(_ResponseStart(client_))
@handler('httperror', priority=1.1)
def _on_handle_httperror(self, event, client, httperror):
event.ignore = False
try:
state = self._buffers[client.socket]
except KeyError:
self._premature_client_disconnect(client)
event.ignore = True
event.stop()
return
if client in state.responses:
event.ignore = True
event.stop()
raise RuntimeError('Got httperror event after response event. Client: %r, HTTPError: %r. Ignoring it.' % (client, httperror))
@handler('httperror', priority=0.1)
def _on_httperror(self, event, client, httperror):
event.stop()
# TODO: move into httoop?
# set the corresponding HTTP status
client.response.status = httperror.status
# set HTTP headers
client.response.headers.update(httperror.headers)
# set HTTP Body
client.response.body = httperror.body
# fire httperror_XXX event
# channels = set([c.channel for c in (self, client.server, client.domain, client.resource) if c is not None])
event = Event.create('httperror_%d' % (httperror.status,))
self.fire(event, *event.channels)
@handler("httperror_success")
def _on_httperror_success(self, evt, httperror):
"""default HTTP error handler"""
if evt.ignore:
return
client = evt.args[0]
client.response.body.encode()
self.fire(ResponseEvent(client))
@handler("request_failure", channel='*')
def _on_request_failure(self, evt, error):
"""Handler for exceptions occuring in the request or response event handler"""
client = evt.args[0]
# if client.redirected:
# return
# if isinstance(evalue, InternalRedirect):
# client.request.uri = evalue.uri
# client.redirected = True
# self.fire(Request(client))
# return
# Ignore filtered requests already handled
if client.handled:
return
# recursion impossible :)
client.handled = True
self._handle_exception(client, error)
@handler("response_failure")
def _on_response_failure(self, evt, error):
client = evt.args[0]
# Ignore failed "response" handlers (e.g. Loggers or Tools)
if client.done:
return
# Ignore disconnected clients
if client.socket not in self._buffers:
client.response.body.close()
return
# creating a new response is better than removing all headers, etc. =)
client.response = Response(status=500)
client.done = True
self._handle_exception(client, error)
@handler("httperror_failure")
def _on_httperror_failure(self, evt, error):
client = evt.args[0]
socket = client.socket
try:
state = self._buffers[socket]
except KeyError:
self._premature_client_disconnect(client)
return
if client in state.responses:
return
print('Exception in httperror_failure: %s, %r' % (error, client))
self.default_internal_server_error(client, error)
self.fire(write(socket, bytes(client.response)))
self.fire(write(socket, bytes(client.response.headers)))
self.fire(write(socket, bytes(client.response.body)))
self.fire(close(socket))
def default_internal_server_error(self, client, error):
client.request = Request()
client.response = Response(status=500)
client.response.headers['Content-Length'] = str(len(client.response.body)).encode('ASCII')
return HTTPError(client, INTERNAL_SERVER_ERROR())
@handler("exception")
def _on_exception(self, *args, **kwargs):
fevent = kwargs['fevent']
if fevent.name == '_read':
socket = fevent.args[0]
self.fire(close(socket))
elif isinstance(fevent, (read, RequestEvent, ResponseEvent, HTTPError)):
pass # already handled
elif fevent.name == 'response.body':
socket = fevent.args[0].socket
self.fire(close(socket))
elif fevent.name == 'httperror_success':
self._on_httperror_failure(fevent.args[0], args)
else:
# TODO: log
handler = reprhandler(kwargs['handler']) if kwargs['handler'] else 'Unknown'
print('Exception in %s\nTraceback: %s' % (handler, ''.join(args[2])))
@handler("disconnect", "close")
def _on_disconnect_or_close(self, socket=None):
if not socket:
# server socket was closed
return
socket.close()
self._remove_client(socket)
def _remove_client(self, socket):
if socket in self._buffers:
del self._buffers[socket]
def _premature_client_disconnect(self, client):
request, response = client
# security: make sure that the generator is executed
if response.body.generator and not request.method.safe:
bytes(response.body)
response.body.close()
def _handle_exception(self, client, error):
etype, httperror, traceback = error
if not isinstance(httperror, StatusException):
httperror = INTERNAL_SERVER_ERROR(u'%s (%s)' % (etype.__name__, httperror))
if not isinstance(traceback, (list, tuple)):
traceback = format_tb(traceback)
httperror.traceback = u''.join(traceback + format_exception_only(*error[:2]))
# channels = set([c.channel for c in (self, client.server, client.domain, client.resource) if c is not None])
channels = [self.channel]
self.fire(HTTPError(client, httperror), *channels)
@handler('error')
def _on_socket_error(self, socket, error):
print('SocketError: %r: %s' % (socket, error))
if isinstance(error, SSLError):
if error.errno == 1 and getattr(error, 'reason', None) == 'HTTP_REQUEST' or error.strerror.endswith(':http request'):
self.http_through_ssl(socket)
return
self.fire(close(socket))
def http_through_ssl(self, socket):
# If we receive a plain HTTP request and we're a TLS enabled socket
# inform the user about his misusage and close the connection immediately.
self.fire(write(socket, b"""Your browser sent a request that this server could not understand.
Reason: You're speaking plain HTTP to an SSL-enabled server port.
Instead use the HTTPS scheme to access this URL, please: https://%s""")) # TODO: add URI by parsing the data which were written into the socket
self.fire(close(socket))
def ssl_through_http(self, socket):
# If we receive a SSL handshake at the start of a request
# and we're not a secure server, then immediately close the
# client connection since we can't respond to it anyway.
parser = self._buffers[socket].parser.parse
def parse(data):
# TODO: if we have a socket with TLS support we should try to use it instead so that we can speak HTTPS and redirect to the other port.
# self.fire(write(socket, b'\x15\x03\x01\x00\x02\x02('))
self.fire(write(socket, b'\x15\x03\x01\x00\x02\x02G'))
# self.fire(write(socket, b'<html><head><title>use plaintext HTTP</title></head><body></body>USE HTTP!</html>'))
self.fire(close(socket))
return parser(b'')
self._buffers[socket].parser.parse = parse