297 lines
11 KiB
Python
297 lines
11 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright 2009 Facebook
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""A non-blocking, single-threaded HTTP server.
|
|
|
|
Typical applications have little direct interaction with the `HTTPServer`
|
|
class except to start a server at the beginning of the process
|
|
(and even that is often done indirectly via `tornado.web.Application.listen`).
|
|
|
|
.. versionchanged:: 4.0
|
|
|
|
The ``HTTPRequest`` class that used to live in this module has been moved
|
|
to `tornado.httputil.HTTPServerRequest`. The old name remains as an alias.
|
|
"""
|
|
|
|
from __future__ import absolute_import, division, print_function, with_statement
|
|
|
|
import socket
|
|
|
|
from tornado.escape import native_str
|
|
from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
|
|
from tornado import gen
|
|
from tornado import httputil
|
|
from tornado import iostream
|
|
from tornado import netutil
|
|
from tornado.tcpserver import TCPServer
|
|
|
|
|
|
class HTTPServer(TCPServer, httputil.HTTPServerConnectionDelegate):
|
|
r"""A non-blocking, single-threaded HTTP server.
|
|
|
|
A server is defined by either a request callback that takes a
|
|
`.HTTPServerRequest` as an argument or a `.HTTPServerConnectionDelegate`
|
|
instance.
|
|
|
|
A simple example server that echoes back the URI you requested::
|
|
|
|
import tornado.httpserver
|
|
import tornado.ioloop
|
|
|
|
def handle_request(request):
|
|
message = "You requested %s\n" % request.uri
|
|
request.connection.write_headers(
|
|
httputil.ResponseStartLine('HTTP/1.1', 200, 'OK'),
|
|
{"Content-Length": str(len(message))})
|
|
request.connection.write(message)
|
|
request.connection.finish()
|
|
|
|
http_server = tornado.httpserver.HTTPServer(handle_request)
|
|
http_server.listen(8888)
|
|
tornado.ioloop.IOLoop.instance().start()
|
|
|
|
Applications should use the methods of `.HTTPConnection` to write
|
|
their response.
|
|
|
|
`HTTPServer` supports keep-alive connections by default
|
|
(automatically for HTTP/1.1, or for HTTP/1.0 when the client
|
|
requests ``Connection: keep-alive``).
|
|
|
|
If ``xheaders`` is ``True``, we support the
|
|
``X-Real-Ip``/``X-Forwarded-For`` and
|
|
``X-Scheme``/``X-Forwarded-Proto`` headers, which override the
|
|
remote IP and URI scheme/protocol for all requests. These headers
|
|
are useful when running Tornado behind a reverse proxy or load
|
|
balancer. The ``protocol`` argument can also be set to ``https``
|
|
if Tornado is run behind an SSL-decoding proxy that does not set one of
|
|
the supported ``xheaders``.
|
|
|
|
To make this server serve SSL traffic, send the ``ssl_options`` dictionary
|
|
argument with the arguments required for the `ssl.wrap_socket` method,
|
|
including ``certfile`` and ``keyfile``. (In Python 3.2+ you can pass
|
|
an `ssl.SSLContext` object instead of a dict)::
|
|
|
|
HTTPServer(applicaton, ssl_options={
|
|
"certfile": os.path.join(data_dir, "mydomain.crt"),
|
|
"keyfile": os.path.join(data_dir, "mydomain.key"),
|
|
})
|
|
|
|
`HTTPServer` initialization follows one of three patterns (the
|
|
initialization methods are defined on `tornado.tcpserver.TCPServer`):
|
|
|
|
1. `~tornado.tcpserver.TCPServer.listen`: simple single-process::
|
|
|
|
server = HTTPServer(app)
|
|
server.listen(8888)
|
|
IOLoop.instance().start()
|
|
|
|
In many cases, `tornado.web.Application.listen` can be used to avoid
|
|
the need to explicitly create the `HTTPServer`.
|
|
|
|
2. `~tornado.tcpserver.TCPServer.bind`/`~tornado.tcpserver.TCPServer.start`:
|
|
simple multi-process::
|
|
|
|
server = HTTPServer(app)
|
|
server.bind(8888)
|
|
server.start(0) # Forks multiple sub-processes
|
|
IOLoop.instance().start()
|
|
|
|
When using this interface, an `.IOLoop` must *not* be passed
|
|
to the `HTTPServer` constructor. `~.TCPServer.start` will always start
|
|
the server on the default singleton `.IOLoop`.
|
|
|
|
3. `~tornado.tcpserver.TCPServer.add_sockets`: advanced multi-process::
|
|
|
|
sockets = tornado.netutil.bind_sockets(8888)
|
|
tornado.process.fork_processes(0)
|
|
server = HTTPServer(app)
|
|
server.add_sockets(sockets)
|
|
IOLoop.instance().start()
|
|
|
|
The `~.TCPServer.add_sockets` interface is more complicated,
|
|
but it can be used with `tornado.process.fork_processes` to
|
|
give you more flexibility in when the fork happens.
|
|
`~.TCPServer.add_sockets` can also be used in single-process
|
|
servers if you want to create your listening sockets in some
|
|
way other than `tornado.netutil.bind_sockets`.
|
|
|
|
.. versionchanged:: 4.0
|
|
Added ``decompress_request``, ``chunk_size``, ``max_header_size``,
|
|
``idle_connection_timeout``, ``body_timeout``, ``max_body_size``
|
|
arguments. Added support for `.HTTPServerConnectionDelegate`
|
|
instances as ``request_callback``.
|
|
"""
|
|
def __init__(self, request_callback, no_keep_alive=False, io_loop=None,
|
|
xheaders=False, ssl_options=None, protocol=None,
|
|
decompress_request=False,
|
|
chunk_size=None, max_header_size=None,
|
|
idle_connection_timeout=None, body_timeout=None,
|
|
max_body_size=None, max_buffer_size=None):
|
|
self.request_callback = request_callback
|
|
self.no_keep_alive = no_keep_alive
|
|
self.xheaders = xheaders
|
|
self.protocol = protocol
|
|
self.conn_params = HTTP1ConnectionParameters(
|
|
decompress=decompress_request,
|
|
chunk_size=chunk_size,
|
|
max_header_size=max_header_size,
|
|
header_timeout=idle_connection_timeout or 3600,
|
|
max_body_size=max_body_size,
|
|
body_timeout=body_timeout)
|
|
TCPServer.__init__(self, io_loop=io_loop, ssl_options=ssl_options,
|
|
max_buffer_size=max_buffer_size,
|
|
read_chunk_size=chunk_size)
|
|
self._connections = set()
|
|
|
|
@gen.coroutine
|
|
def close_all_connections(self):
|
|
while self._connections:
|
|
# Peek at an arbitrary element of the set
|
|
conn = next(iter(self._connections))
|
|
yield conn.close()
|
|
|
|
def handle_stream(self, stream, address):
|
|
context = _HTTPRequestContext(stream, address,
|
|
self.protocol)
|
|
conn = HTTP1ServerConnection(
|
|
stream, self.conn_params, context)
|
|
self._connections.add(conn)
|
|
conn.start_serving(self)
|
|
|
|
def start_request(self, server_conn, request_conn):
|
|
return _ServerRequestAdapter(self, request_conn)
|
|
|
|
def on_close(self, server_conn):
|
|
self._connections.remove(server_conn)
|
|
|
|
|
|
class _HTTPRequestContext(object):
|
|
def __init__(self, stream, address, protocol):
|
|
self.address = address
|
|
self.protocol = protocol
|
|
# Save the socket's address family now so we know how to
|
|
# interpret self.address even after the stream is closed
|
|
# and its socket attribute replaced with None.
|
|
if stream.socket is not None:
|
|
self.address_family = stream.socket.family
|
|
else:
|
|
self.address_family = None
|
|
# In HTTPServerRequest we want an IP, not a full socket address.
|
|
if (self.address_family in (socket.AF_INET, socket.AF_INET6) and
|
|
address is not None):
|
|
self.remote_ip = address[0]
|
|
else:
|
|
# Unix (or other) socket; fake the remote address.
|
|
self.remote_ip = '0.0.0.0'
|
|
if protocol:
|
|
self.protocol = protocol
|
|
elif isinstance(stream, iostream.SSLIOStream):
|
|
self.protocol = "https"
|
|
else:
|
|
self.protocol = "http"
|
|
self._orig_remote_ip = self.remote_ip
|
|
self._orig_protocol = self.protocol
|
|
|
|
def __str__(self):
|
|
if self.address_family in (socket.AF_INET, socket.AF_INET6):
|
|
return self.remote_ip
|
|
elif isinstance(self.address, bytes):
|
|
# Python 3 with the -bb option warns about str(bytes),
|
|
# so convert it explicitly.
|
|
# Unix socket addresses are str on mac but bytes on linux.
|
|
return native_str(self.address)
|
|
else:
|
|
return str(self.address)
|
|
|
|
def _apply_xheaders(self, headers):
|
|
"""Rewrite the ``remote_ip`` and ``protocol`` fields."""
|
|
# Squid uses X-Forwarded-For, others use X-Real-Ip
|
|
ip = headers.get("X-Forwarded-For", self.remote_ip)
|
|
ip = ip.split(',')[-1].strip()
|
|
ip = headers.get("X-Real-Ip", ip)
|
|
if netutil.is_valid_ip(ip):
|
|
self.remote_ip = ip
|
|
# AWS uses X-Forwarded-Proto
|
|
proto_header = headers.get(
|
|
"X-Scheme", headers.get("X-Forwarded-Proto",
|
|
self.protocol))
|
|
if proto_header in ("http", "https"):
|
|
self.protocol = proto_header
|
|
|
|
def _unapply_xheaders(self):
|
|
"""Undo changes from `_apply_xheaders`.
|
|
|
|
Xheaders are per-request so they should not leak to the next
|
|
request on the same connection.
|
|
"""
|
|
self.remote_ip = self._orig_remote_ip
|
|
self.protocol = self._orig_protocol
|
|
|
|
|
|
class _ServerRequestAdapter(httputil.HTTPMessageDelegate):
|
|
"""Adapts the `HTTPMessageDelegate` interface to the interface expected
|
|
by our clients.
|
|
"""
|
|
def __init__(self, server, connection):
|
|
self.server = server
|
|
self.connection = connection
|
|
self.request = None
|
|
if isinstance(server.request_callback,
|
|
httputil.HTTPServerConnectionDelegate):
|
|
self.delegate = server.request_callback.start_request(connection)
|
|
self._chunks = None
|
|
else:
|
|
self.delegate = None
|
|
self._chunks = []
|
|
|
|
def headers_received(self, start_line, headers):
|
|
if self.server.xheaders:
|
|
self.connection.context._apply_xheaders(headers)
|
|
if self.delegate is None:
|
|
self.request = httputil.HTTPServerRequest(
|
|
connection=self.connection, start_line=start_line,
|
|
headers=headers)
|
|
else:
|
|
return self.delegate.headers_received(start_line, headers)
|
|
|
|
def data_received(self, chunk):
|
|
if self.delegate is None:
|
|
self._chunks.append(chunk)
|
|
else:
|
|
return self.delegate.data_received(chunk)
|
|
|
|
def finish(self):
|
|
if self.delegate is None:
|
|
self.request.body = b''.join(self._chunks)
|
|
self.request._parse_body()
|
|
self.server.request_callback(self.request)
|
|
else:
|
|
self.delegate.finish()
|
|
self._cleanup()
|
|
|
|
def on_connection_close(self):
|
|
if self.delegate is None:
|
|
self._chunks = None
|
|
else:
|
|
self.delegate.on_connection_close()
|
|
self._cleanup()
|
|
|
|
def _cleanup(self):
|
|
if self.server.xheaders:
|
|
self.connection.context._unapply_xheaders()
|
|
|
|
|
|
HTTPRequest = httputil.HTTPServerRequest
|