651 lines
27 KiB
Python
651 lines
27 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2014 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Client and server implementations of HTTP/1.x.
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.. versionadded:: 4.0
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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from tornado.concurrent import Future
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from tornado.escape import native_str, utf8
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from tornado import gen
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from tornado import httputil
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from tornado import iostream
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from tornado.log import gen_log, app_log
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from tornado import stack_context
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from tornado.util import GzipDecompressor
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class _QuietException(Exception):
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def __init__(self):
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pass
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class _ExceptionLoggingContext(object):
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"""Used with the ``with`` statement when calling delegate methods to
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log any exceptions with the given logger. Any exceptions caught are
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converted to _QuietException
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"""
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def __init__(self, logger):
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self.logger = logger
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def __enter__(self):
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pass
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def __exit__(self, typ, value, tb):
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if value is not None:
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self.logger.error("Uncaught exception", exc_info=(typ, value, tb))
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raise _QuietException
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class HTTP1ConnectionParameters(object):
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"""Parameters for `.HTTP1Connection` and `.HTTP1ServerConnection`.
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"""
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def __init__(self, no_keep_alive=False, chunk_size=None,
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max_header_size=None, header_timeout=None, max_body_size=None,
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body_timeout=None, decompress=False):
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"""
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:arg bool no_keep_alive: If true, always close the connection after
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one request.
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:arg int chunk_size: how much data to read into memory at once
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:arg int max_header_size: maximum amount of data for HTTP headers
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:arg float header_timeout: how long to wait for all headers (seconds)
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:arg int max_body_size: maximum amount of data for body
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:arg float body_timeout: how long to wait while reading body (seconds)
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:arg bool decompress: if true, decode incoming
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``Content-Encoding: gzip``
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"""
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self.no_keep_alive = no_keep_alive
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self.chunk_size = chunk_size or 65536
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self.max_header_size = max_header_size or 65536
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self.header_timeout = header_timeout
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self.max_body_size = max_body_size
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self.body_timeout = body_timeout
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self.decompress = decompress
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class HTTP1Connection(httputil.HTTPConnection):
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"""Implements the HTTP/1.x protocol.
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This class can be on its own for clients, or via `HTTP1ServerConnection`
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for servers.
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"""
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def __init__(self, stream, is_client, params=None, context=None):
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"""
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:arg stream: an `.IOStream`
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:arg bool is_client: client or server
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:arg params: a `.HTTP1ConnectionParameters` instance or ``None``
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:arg context: an opaque application-defined object that can be accessed
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as ``connection.context``.
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"""
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self.is_client = is_client
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self.stream = stream
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if params is None:
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params = HTTP1ConnectionParameters()
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self.params = params
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self.context = context
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self.no_keep_alive = params.no_keep_alive
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# The body limits can be altered by the delegate, so save them
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# here instead of just referencing self.params later.
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self._max_body_size = (self.params.max_body_size or
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self.stream.max_buffer_size)
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self._body_timeout = self.params.body_timeout
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# _write_finished is set to True when finish() has been called,
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# i.e. there will be no more data sent. Data may still be in the
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# stream's write buffer.
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self._write_finished = False
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# True when we have read the entire incoming body.
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self._read_finished = False
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# _finish_future resolves when all data has been written and flushed
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# to the IOStream.
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self._finish_future = Future()
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# If true, the connection should be closed after this request
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# (after the response has been written in the server side,
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# and after it has been read in the client)
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self._disconnect_on_finish = False
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self._clear_callbacks()
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# Save the start lines after we read or write them; they
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# affect later processing (e.g. 304 responses and HEAD methods
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# have content-length but no bodies)
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self._request_start_line = None
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self._response_start_line = None
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self._request_headers = None
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# True if we are writing output with chunked encoding.
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self._chunking_output = None
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# While reading a body with a content-length, this is the
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# amount left to read.
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self._expected_content_remaining = None
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# A Future for our outgoing writes, returned by IOStream.write.
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self._pending_write = None
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def read_response(self, delegate):
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"""Read a single HTTP response.
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Typical client-mode usage is to write a request using `write_headers`,
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`write`, and `finish`, and then call ``read_response``.
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:arg delegate: a `.HTTPMessageDelegate`
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Returns a `.Future` that resolves to None after the full response has
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been read.
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"""
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if self.params.decompress:
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delegate = _GzipMessageDelegate(delegate, self.params.chunk_size)
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return self._read_message(delegate)
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@gen.coroutine
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def _read_message(self, delegate):
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need_delegate_close = False
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try:
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header_future = self.stream.read_until_regex(
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b"\r?\n\r?\n",
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max_bytes=self.params.max_header_size)
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if self.params.header_timeout is None:
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header_data = yield header_future
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else:
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try:
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header_data = yield gen.with_timeout(
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self.stream.io_loop.time() + self.params.header_timeout,
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header_future,
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io_loop=self.stream.io_loop)
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except gen.TimeoutError:
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self.close()
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raise gen.Return(False)
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start_line, headers = self._parse_headers(header_data)
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if self.is_client:
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start_line = httputil.parse_response_start_line(start_line)
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self._response_start_line = start_line
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else:
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start_line = httputil.parse_request_start_line(start_line)
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self._request_start_line = start_line
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self._request_headers = headers
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self._disconnect_on_finish = not self._can_keep_alive(
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start_line, headers)
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need_delegate_close = True
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with _ExceptionLoggingContext(app_log):
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header_future = delegate.headers_received(start_line, headers)
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if header_future is not None:
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yield header_future
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if self.stream is None:
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# We've been detached.
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need_delegate_close = False
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raise gen.Return(False)
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skip_body = False
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if self.is_client:
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if (self._request_start_line is not None and
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self._request_start_line.method == 'HEAD'):
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skip_body = True
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code = start_line.code
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if code == 304:
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skip_body = True
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if code >= 100 and code < 200:
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# TODO: client delegates will get headers_received twice
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# in the case of a 100-continue. Document or change?
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yield self._read_message(delegate)
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else:
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if (headers.get("Expect") == "100-continue" and
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not self._write_finished):
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self.stream.write(b"HTTP/1.1 100 (Continue)\r\n\r\n")
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if not skip_body:
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body_future = self._read_body(headers, delegate)
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if body_future is not None:
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if self._body_timeout is None:
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yield body_future
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else:
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try:
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yield gen.with_timeout(
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self.stream.io_loop.time() + self._body_timeout,
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body_future, self.stream.io_loop)
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except gen.TimeoutError:
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gen_log.info("Timeout reading body from %s",
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self.context)
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self.stream.close()
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raise gen.Return(False)
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self._read_finished = True
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if not self._write_finished or self.is_client:
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need_delegate_close = False
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with _ExceptionLoggingContext(app_log):
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delegate.finish()
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# If we're waiting for the application to produce an asynchronous
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# response, and we're not detached, register a close callback
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# on the stream (we didn't need one while we were reading)
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if (not self._finish_future.done() and
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self.stream is not None and
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not self.stream.closed()):
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self.stream.set_close_callback(self._on_connection_close)
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yield self._finish_future
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if self.is_client and self._disconnect_on_finish:
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self.close()
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if self.stream is None:
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raise gen.Return(False)
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except httputil.HTTPInputError as e:
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gen_log.info("Malformed HTTP message from %s: %s",
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self.context, e)
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self.close()
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raise gen.Return(False)
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finally:
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if need_delegate_close:
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with _ExceptionLoggingContext(app_log):
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delegate.on_connection_close()
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self._clear_callbacks()
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raise gen.Return(True)
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def _clear_callbacks(self):
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"""Clears the callback attributes.
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This allows the request handler to be garbage collected more
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quickly in CPython by breaking up reference cycles.
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"""
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self._write_callback = None
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self._write_future = None
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self._close_callback = None
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if self.stream is not None:
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self.stream.set_close_callback(None)
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def set_close_callback(self, callback):
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"""Sets a callback that will be run when the connection is closed.
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.. deprecated:: 4.0
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Use `.HTTPMessageDelegate.on_connection_close` instead.
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"""
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self._close_callback = stack_context.wrap(callback)
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def _on_connection_close(self):
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# Note that this callback is only registered on the IOStream
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# when we have finished reading the request and are waiting for
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# the application to produce its response.
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if self._close_callback is not None:
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callback = self._close_callback
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self._close_callback = None
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callback()
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if not self._finish_future.done():
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self._finish_future.set_result(None)
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self._clear_callbacks()
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def close(self):
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if self.stream is not None:
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self.stream.close()
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self._clear_callbacks()
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if not self._finish_future.done():
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self._finish_future.set_result(None)
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def detach(self):
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"""Take control of the underlying stream.
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Returns the underlying `.IOStream` object and stops all further
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HTTP processing. May only be called during
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`.HTTPMessageDelegate.headers_received`. Intended for implementing
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protocols like websockets that tunnel over an HTTP handshake.
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"""
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self._clear_callbacks()
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stream = self.stream
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self.stream = None
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return stream
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def set_body_timeout(self, timeout):
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"""Sets the body timeout for a single request.
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Overrides the value from `.HTTP1ConnectionParameters`.
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"""
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self._body_timeout = timeout
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def set_max_body_size(self, max_body_size):
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"""Sets the body size limit for a single request.
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Overrides the value from `.HTTP1ConnectionParameters`.
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"""
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self._max_body_size = max_body_size
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def write_headers(self, start_line, headers, chunk=None, callback=None):
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"""Implements `.HTTPConnection.write_headers`."""
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if self.is_client:
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self._request_start_line = start_line
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# Client requests with a non-empty body must have either a
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# Content-Length or a Transfer-Encoding.
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self._chunking_output = (
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start_line.method in ('POST', 'PUT', 'PATCH') and
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'Content-Length' not in headers and
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'Transfer-Encoding' not in headers)
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else:
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self._response_start_line = start_line
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self._chunking_output = (
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# TODO: should this use
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# self._request_start_line.version or
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# start_line.version?
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self._request_start_line.version == 'HTTP/1.1' and
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# 304 responses have no body (not even a zero-length body), and so
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# should not have either Content-Length or Transfer-Encoding.
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# headers.
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start_line.code != 304 and
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# No need to chunk the output if a Content-Length is specified.
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'Content-Length' not in headers and
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# Applications are discouraged from touching Transfer-Encoding,
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# but if they do, leave it alone.
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'Transfer-Encoding' not in headers)
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# If a 1.0 client asked for keep-alive, add the header.
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if (self._request_start_line.version == 'HTTP/1.0' and
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(self._request_headers.get('Connection', '').lower()
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== 'keep-alive')):
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headers['Connection'] = 'Keep-Alive'
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if self._chunking_output:
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headers['Transfer-Encoding'] = 'chunked'
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if (not self.is_client and
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(self._request_start_line.method == 'HEAD' or
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start_line.code == 304)):
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self._expected_content_remaining = 0
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elif 'Content-Length' in headers:
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self._expected_content_remaining = int(headers['Content-Length'])
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else:
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self._expected_content_remaining = None
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lines = [utf8("%s %s %s" % start_line)]
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lines.extend([utf8(n) + b": " + utf8(v) for n, v in headers.get_all()])
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for line in lines:
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if b'\n' in line:
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raise ValueError('Newline in header: ' + repr(line))
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future = None
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if self.stream.closed():
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future = self._write_future = Future()
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future.set_exception(iostream.StreamClosedError())
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else:
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if callback is not None:
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self._write_callback = stack_context.wrap(callback)
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else:
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future = self._write_future = Future()
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data = b"\r\n".join(lines) + b"\r\n\r\n"
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if chunk:
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data += self._format_chunk(chunk)
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self._pending_write = self.stream.write(data)
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self._pending_write.add_done_callback(self._on_write_complete)
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return future
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def _format_chunk(self, chunk):
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if self._expected_content_remaining is not None:
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self._expected_content_remaining -= len(chunk)
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if self._expected_content_remaining < 0:
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# Close the stream now to stop further framing errors.
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self.stream.close()
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raise httputil.HTTPOutputError(
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"Tried to write more data than Content-Length")
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if self._chunking_output and chunk:
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# Don't write out empty chunks because that means END-OF-STREAM
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# with chunked encoding
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return utf8("%x" % len(chunk)) + b"\r\n" + chunk + b"\r\n"
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else:
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return chunk
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def write(self, chunk, callback=None):
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"""Implements `.HTTPConnection.write`.
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For backwards compatibility is is allowed but deprecated to
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skip `write_headers` and instead call `write()` with a
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pre-encoded header block.
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"""
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future = None
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if self.stream.closed():
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future = self._write_future = Future()
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self._write_future.set_exception(iostream.StreamClosedError())
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else:
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if callback is not None:
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self._write_callback = stack_context.wrap(callback)
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else:
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future = self._write_future = Future()
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self._pending_write = self.stream.write(self._format_chunk(chunk))
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self._pending_write.add_done_callback(self._on_write_complete)
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return future
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def finish(self):
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"""Implements `.HTTPConnection.finish`."""
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if (self._expected_content_remaining is not None and
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self._expected_content_remaining != 0 and
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not self.stream.closed()):
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self.stream.close()
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raise httputil.HTTPOutputError(
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"Tried to write %d bytes less than Content-Length" %
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self._expected_content_remaining)
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if self._chunking_output:
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if not self.stream.closed():
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self._pending_write = self.stream.write(b"0\r\n\r\n")
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self._pending_write.add_done_callback(self._on_write_complete)
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self._write_finished = True
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# If the app finished the request while we're still reading,
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# divert any remaining data away from the delegate and
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# close the connection when we're done sending our response.
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# Closing the connection is the only way to avoid reading the
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# whole input body.
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if not self._read_finished:
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self._disconnect_on_finish = True
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# No more data is coming, so instruct TCP to send any remaining
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# data immediately instead of waiting for a full packet or ack.
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self.stream.set_nodelay(True)
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if self._pending_write is None:
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self._finish_request(None)
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else:
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self._pending_write.add_done_callback(self._finish_request)
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def _on_write_complete(self, future):
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if self._write_callback is not None:
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callback = self._write_callback
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self._write_callback = None
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self.stream.io_loop.add_callback(callback)
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if self._write_future is not None:
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future = self._write_future
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self._write_future = None
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future.set_result(None)
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def _can_keep_alive(self, start_line, headers):
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if self.params.no_keep_alive:
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return False
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connection_header = headers.get("Connection")
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if connection_header is not None:
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connection_header = connection_header.lower()
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if start_line.version == "HTTP/1.1":
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return connection_header != "close"
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elif ("Content-Length" in headers
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or start_line.method in ("HEAD", "GET")):
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return connection_header == "keep-alive"
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return False
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def _finish_request(self, future):
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self._clear_callbacks()
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if not self.is_client and self._disconnect_on_finish:
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self.close()
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return
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# Turn Nagle's algorithm back on, leaving the stream in its
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# default state for the next request.
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self.stream.set_nodelay(False)
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if not self._finish_future.done():
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self._finish_future.set_result(None)
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def _parse_headers(self, data):
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data = native_str(data.decode('latin1'))
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eol = data.find("\r\n")
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start_line = data[:eol]
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try:
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headers = httputil.HTTPHeaders.parse(data[eol:])
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except ValueError:
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# probably form split() if there was no ':' in the line
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raise httputil.HTTPInputError("Malformed HTTP headers: %r" %
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data[eol:100])
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return start_line, headers
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def _read_body(self, headers, delegate):
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content_length = headers.get("Content-Length")
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if content_length:
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content_length = int(content_length)
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if content_length > self._max_body_size:
|
|
raise httputil.HTTPInputError("Content-Length too long")
|
|
return self._read_fixed_body(content_length, delegate)
|
|
if headers.get("Transfer-Encoding") == "chunked":
|
|
return self._read_chunked_body(delegate)
|
|
if self.is_client:
|
|
return self._read_body_until_close(delegate)
|
|
return None
|
|
|
|
@gen.coroutine
|
|
def _read_fixed_body(self, content_length, delegate):
|
|
while content_length > 0:
|
|
body = yield self.stream.read_bytes(
|
|
min(self.params.chunk_size, content_length), partial=True)
|
|
content_length -= len(body)
|
|
if not self._write_finished or self.is_client:
|
|
with _ExceptionLoggingContext(app_log):
|
|
yield gen.maybe_future(delegate.data_received(body))
|
|
|
|
@gen.coroutine
|
|
def _read_chunked_body(self, delegate):
|
|
# TODO: "chunk extensions" http://tools.ietf.org/html/rfc2616#section-3.6.1
|
|
total_size = 0
|
|
while True:
|
|
chunk_len = yield self.stream.read_until(b"\r\n", max_bytes=64)
|
|
chunk_len = int(chunk_len.strip(), 16)
|
|
if chunk_len == 0:
|
|
return
|
|
total_size += chunk_len
|
|
if total_size > self._max_body_size:
|
|
raise httputil.HTTPInputError("chunked body too large")
|
|
bytes_to_read = chunk_len
|
|
while bytes_to_read:
|
|
chunk = yield self.stream.read_bytes(
|
|
min(bytes_to_read, self.params.chunk_size), partial=True)
|
|
bytes_to_read -= len(chunk)
|
|
if not self._write_finished or self.is_client:
|
|
with _ExceptionLoggingContext(app_log):
|
|
yield gen.maybe_future(delegate.data_received(chunk))
|
|
# chunk ends with \r\n
|
|
crlf = yield self.stream.read_bytes(2)
|
|
assert crlf == b"\r\n"
|
|
|
|
@gen.coroutine
|
|
def _read_body_until_close(self, delegate):
|
|
body = yield self.stream.read_until_close()
|
|
if not self._write_finished or self.is_client:
|
|
with _ExceptionLoggingContext(app_log):
|
|
delegate.data_received(body)
|
|
|
|
|
|
class _GzipMessageDelegate(httputil.HTTPMessageDelegate):
|
|
"""Wraps an `HTTPMessageDelegate` to decode ``Content-Encoding: gzip``.
|
|
"""
|
|
def __init__(self, delegate, chunk_size):
|
|
self._delegate = delegate
|
|
self._chunk_size = chunk_size
|
|
self._decompressor = None
|
|
|
|
def headers_received(self, start_line, headers):
|
|
if headers.get("Content-Encoding") == "gzip":
|
|
self._decompressor = GzipDecompressor()
|
|
# Downstream delegates will only see uncompressed data,
|
|
# so rename the content-encoding header.
|
|
# (but note that curl_httpclient doesn't do this).
|
|
headers.add("X-Consumed-Content-Encoding",
|
|
headers["Content-Encoding"])
|
|
del headers["Content-Encoding"]
|
|
return self._delegate.headers_received(start_line, headers)
|
|
|
|
@gen.coroutine
|
|
def data_received(self, chunk):
|
|
if self._decompressor:
|
|
compressed_data = chunk
|
|
while compressed_data:
|
|
decompressed = self._decompressor.decompress(
|
|
compressed_data, self._chunk_size)
|
|
if decompressed:
|
|
yield gen.maybe_future(
|
|
self._delegate.data_received(decompressed))
|
|
compressed_data = self._decompressor.unconsumed_tail
|
|
else:
|
|
yield gen.maybe_future(self._delegate.data_received(chunk))
|
|
|
|
def finish(self):
|
|
if self._decompressor is not None:
|
|
tail = self._decompressor.flush()
|
|
if tail:
|
|
# I believe the tail will always be empty (i.e.
|
|
# decompress will return all it can). The purpose
|
|
# of the flush call is to detect errors such
|
|
# as truncated input. But in case it ever returns
|
|
# anything, treat it as an extra chunk
|
|
self._delegate.data_received(tail)
|
|
return self._delegate.finish()
|
|
|
|
|
|
class HTTP1ServerConnection(object):
|
|
"""An HTTP/1.x server."""
|
|
def __init__(self, stream, params=None, context=None):
|
|
"""
|
|
:arg stream: an `.IOStream`
|
|
:arg params: a `.HTTP1ConnectionParameters` or None
|
|
:arg context: an opaque application-defined object that is accessible
|
|
as ``connection.context``
|
|
"""
|
|
self.stream = stream
|
|
if params is None:
|
|
params = HTTP1ConnectionParameters()
|
|
self.params = params
|
|
self.context = context
|
|
self._serving_future = None
|
|
|
|
@gen.coroutine
|
|
def close(self):
|
|
"""Closes the connection.
|
|
|
|
Returns a `.Future` that resolves after the serving loop has exited.
|
|
"""
|
|
self.stream.close()
|
|
# Block until the serving loop is done, but ignore any exceptions
|
|
# (start_serving is already responsible for logging them).
|
|
try:
|
|
yield self._serving_future
|
|
except Exception:
|
|
pass
|
|
|
|
def start_serving(self, delegate):
|
|
"""Starts serving requests on this connection.
|
|
|
|
:arg delegate: a `.HTTPServerConnectionDelegate`
|
|
"""
|
|
assert isinstance(delegate, httputil.HTTPServerConnectionDelegate)
|
|
self._serving_future = self._server_request_loop(delegate)
|
|
# Register the future on the IOLoop so its errors get logged.
|
|
self.stream.io_loop.add_future(self._serving_future,
|
|
lambda f: f.result())
|
|
|
|
@gen.coroutine
|
|
def _server_request_loop(self, delegate):
|
|
try:
|
|
while True:
|
|
conn = HTTP1Connection(self.stream, False,
|
|
self.params, self.context)
|
|
request_delegate = delegate.start_request(self, conn)
|
|
try:
|
|
ret = yield conn.read_response(request_delegate)
|
|
except (iostream.StreamClosedError,
|
|
iostream.UnsatisfiableReadError):
|
|
return
|
|
except _QuietException:
|
|
# This exception was already logged.
|
|
conn.close()
|
|
return
|
|
except Exception:
|
|
gen_log.error("Uncaught exception", exc_info=True)
|
|
conn.close()
|
|
return
|
|
if not ret:
|
|
return
|
|
yield gen.moment
|
|
finally:
|
|
delegate.on_close(self)
|