You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
845 lines
35 KiB
Python
845 lines
35 KiB
Python
#
|
|
# Copyright 2014 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.
|
|
|
|
"""Client and server implementations of HTTP/1.x.
|
|
|
|
.. versionadded:: 4.0
|
|
"""
|
|
|
|
import asyncio
|
|
import logging
|
|
import re
|
|
import types
|
|
|
|
from tornado.concurrent import (
|
|
Future,
|
|
future_add_done_callback,
|
|
future_set_result_unless_cancelled,
|
|
)
|
|
from tornado.escape import native_str, utf8
|
|
from tornado import gen
|
|
from tornado import httputil
|
|
from tornado import iostream
|
|
from tornado.log import gen_log, app_log
|
|
from tornado.util import GzipDecompressor
|
|
|
|
|
|
from typing import cast, Optional, Type, Awaitable, Callable, Union, Tuple
|
|
|
|
|
|
class _QuietException(Exception):
|
|
def __init__(self) -> None:
|
|
pass
|
|
|
|
|
|
class _ExceptionLoggingContext(object):
|
|
"""Used with the ``with`` statement when calling delegate methods to
|
|
log any exceptions with the given logger. Any exceptions caught are
|
|
converted to _QuietException
|
|
"""
|
|
|
|
def __init__(self, logger: logging.Logger) -> None:
|
|
self.logger = logger
|
|
|
|
def __enter__(self) -> None:
|
|
pass
|
|
|
|
def __exit__(
|
|
self,
|
|
typ: "Optional[Type[BaseException]]",
|
|
value: Optional[BaseException],
|
|
tb: types.TracebackType,
|
|
) -> None:
|
|
if value is not None:
|
|
assert typ is not None
|
|
self.logger.error("Uncaught exception", exc_info=(typ, value, tb))
|
|
raise _QuietException
|
|
|
|
|
|
class HTTP1ConnectionParameters(object):
|
|
"""Parameters for `.HTTP1Connection` and `.HTTP1ServerConnection`."""
|
|
|
|
def __init__(
|
|
self,
|
|
no_keep_alive: bool = False,
|
|
chunk_size: Optional[int] = None,
|
|
max_header_size: Optional[int] = None,
|
|
header_timeout: Optional[float] = None,
|
|
max_body_size: Optional[int] = None,
|
|
body_timeout: Optional[float] = None,
|
|
decompress: bool = False,
|
|
) -> None:
|
|
"""
|
|
:arg bool no_keep_alive: If true, always close the connection after
|
|
one request.
|
|
:arg int chunk_size: how much data to read into memory at once
|
|
:arg int max_header_size: maximum amount of data for HTTP headers
|
|
:arg float header_timeout: how long to wait for all headers (seconds)
|
|
:arg int max_body_size: maximum amount of data for body
|
|
:arg float body_timeout: how long to wait while reading body (seconds)
|
|
:arg bool decompress: if true, decode incoming
|
|
``Content-Encoding: gzip``
|
|
"""
|
|
self.no_keep_alive = no_keep_alive
|
|
self.chunk_size = chunk_size or 65536
|
|
self.max_header_size = max_header_size or 65536
|
|
self.header_timeout = header_timeout
|
|
self.max_body_size = max_body_size
|
|
self.body_timeout = body_timeout
|
|
self.decompress = decompress
|
|
|
|
|
|
class HTTP1Connection(httputil.HTTPConnection):
|
|
"""Implements the HTTP/1.x protocol.
|
|
|
|
This class can be on its own for clients, or via `HTTP1ServerConnection`
|
|
for servers.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
stream: iostream.IOStream,
|
|
is_client: bool,
|
|
params: Optional[HTTP1ConnectionParameters] = None,
|
|
context: Optional[object] = None,
|
|
) -> None:
|
|
"""
|
|
:arg stream: an `.IOStream`
|
|
:arg bool is_client: client or server
|
|
:arg params: a `.HTTP1ConnectionParameters` instance or ``None``
|
|
:arg context: an opaque application-defined object that can be accessed
|
|
as ``connection.context``.
|
|
"""
|
|
self.is_client = is_client
|
|
self.stream = stream
|
|
if params is None:
|
|
params = HTTP1ConnectionParameters()
|
|
self.params = params
|
|
self.context = context
|
|
self.no_keep_alive = params.no_keep_alive
|
|
# The body limits can be altered by the delegate, so save them
|
|
# here instead of just referencing self.params later.
|
|
self._max_body_size = (
|
|
self.params.max_body_size
|
|
if self.params.max_body_size is not None
|
|
else self.stream.max_buffer_size
|
|
)
|
|
self._body_timeout = self.params.body_timeout
|
|
# _write_finished is set to True when finish() has been called,
|
|
# i.e. there will be no more data sent. Data may still be in the
|
|
# stream's write buffer.
|
|
self._write_finished = False
|
|
# True when we have read the entire incoming body.
|
|
self._read_finished = False
|
|
# _finish_future resolves when all data has been written and flushed
|
|
# to the IOStream.
|
|
self._finish_future = Future() # type: Future[None]
|
|
# If true, the connection should be closed after this request
|
|
# (after the response has been written in the server side,
|
|
# and after it has been read in the client)
|
|
self._disconnect_on_finish = False
|
|
self._clear_callbacks()
|
|
# Save the start lines after we read or write them; they
|
|
# affect later processing (e.g. 304 responses and HEAD methods
|
|
# have content-length but no bodies)
|
|
self._request_start_line = None # type: Optional[httputil.RequestStartLine]
|
|
self._response_start_line = None # type: Optional[httputil.ResponseStartLine]
|
|
self._request_headers = None # type: Optional[httputil.HTTPHeaders]
|
|
# True if we are writing output with chunked encoding.
|
|
self._chunking_output = False
|
|
# While reading a body with a content-length, this is the
|
|
# amount left to read.
|
|
self._expected_content_remaining = None # type: Optional[int]
|
|
# A Future for our outgoing writes, returned by IOStream.write.
|
|
self._pending_write = None # type: Optional[Future[None]]
|
|
|
|
def read_response(self, delegate: httputil.HTTPMessageDelegate) -> Awaitable[bool]:
|
|
"""Read a single HTTP response.
|
|
|
|
Typical client-mode usage is to write a request using `write_headers`,
|
|
`write`, and `finish`, and then call ``read_response``.
|
|
|
|
:arg delegate: a `.HTTPMessageDelegate`
|
|
|
|
Returns a `.Future` that resolves to a bool after the full response has
|
|
been read. The result is true if the stream is still open.
|
|
"""
|
|
if self.params.decompress:
|
|
delegate = _GzipMessageDelegate(delegate, self.params.chunk_size)
|
|
return self._read_message(delegate)
|
|
|
|
async def _read_message(self, delegate: httputil.HTTPMessageDelegate) -> bool:
|
|
need_delegate_close = False
|
|
try:
|
|
header_future = self.stream.read_until_regex(
|
|
b"\r?\n\r?\n", max_bytes=self.params.max_header_size
|
|
)
|
|
if self.params.header_timeout is None:
|
|
header_data = await header_future
|
|
else:
|
|
try:
|
|
header_data = await gen.with_timeout(
|
|
self.stream.io_loop.time() + self.params.header_timeout,
|
|
header_future,
|
|
quiet_exceptions=iostream.StreamClosedError,
|
|
)
|
|
except gen.TimeoutError:
|
|
self.close()
|
|
return False
|
|
start_line_str, headers = self._parse_headers(header_data)
|
|
if self.is_client:
|
|
resp_start_line = httputil.parse_response_start_line(start_line_str)
|
|
self._response_start_line = resp_start_line
|
|
start_line = (
|
|
resp_start_line
|
|
) # type: Union[httputil.RequestStartLine, httputil.ResponseStartLine]
|
|
# TODO: this will need to change to support client-side keepalive
|
|
self._disconnect_on_finish = False
|
|
else:
|
|
req_start_line = httputil.parse_request_start_line(start_line_str)
|
|
self._request_start_line = req_start_line
|
|
self._request_headers = headers
|
|
start_line = req_start_line
|
|
self._disconnect_on_finish = not self._can_keep_alive(
|
|
req_start_line, headers
|
|
)
|
|
need_delegate_close = True
|
|
with _ExceptionLoggingContext(app_log):
|
|
header_recv_future = delegate.headers_received(start_line, headers)
|
|
if header_recv_future is not None:
|
|
await header_recv_future
|
|
if self.stream is None:
|
|
# We've been detached.
|
|
need_delegate_close = False
|
|
return False
|
|
skip_body = False
|
|
if self.is_client:
|
|
assert isinstance(start_line, httputil.ResponseStartLine)
|
|
if (
|
|
self._request_start_line is not None
|
|
and self._request_start_line.method == "HEAD"
|
|
):
|
|
skip_body = True
|
|
code = start_line.code
|
|
if code == 304:
|
|
# 304 responses may include the content-length header
|
|
# but do not actually have a body.
|
|
# http://tools.ietf.org/html/rfc7230#section-3.3
|
|
skip_body = True
|
|
if 100 <= code < 200:
|
|
# 1xx responses should never indicate the presence of
|
|
# a body.
|
|
if "Content-Length" in headers or "Transfer-Encoding" in headers:
|
|
raise httputil.HTTPInputError(
|
|
"Response code %d cannot have body" % code
|
|
)
|
|
# TODO: client delegates will get headers_received twice
|
|
# in the case of a 100-continue. Document or change?
|
|
await self._read_message(delegate)
|
|
else:
|
|
if headers.get("Expect") == "100-continue" and not self._write_finished:
|
|
self.stream.write(b"HTTP/1.1 100 (Continue)\r\n\r\n")
|
|
if not skip_body:
|
|
body_future = self._read_body(
|
|
resp_start_line.code if self.is_client else 0, headers, delegate
|
|
)
|
|
if body_future is not None:
|
|
if self._body_timeout is None:
|
|
await body_future
|
|
else:
|
|
try:
|
|
await gen.with_timeout(
|
|
self.stream.io_loop.time() + self._body_timeout,
|
|
body_future,
|
|
quiet_exceptions=iostream.StreamClosedError,
|
|
)
|
|
except gen.TimeoutError:
|
|
gen_log.info("Timeout reading body from %s", self.context)
|
|
self.stream.close()
|
|
return False
|
|
self._read_finished = True
|
|
if not self._write_finished or self.is_client:
|
|
need_delegate_close = False
|
|
with _ExceptionLoggingContext(app_log):
|
|
delegate.finish()
|
|
# If we're waiting for the application to produce an asynchronous
|
|
# response, and we're not detached, register a close callback
|
|
# on the stream (we didn't need one while we were reading)
|
|
if (
|
|
not self._finish_future.done()
|
|
and self.stream is not None
|
|
and not self.stream.closed()
|
|
):
|
|
self.stream.set_close_callback(self._on_connection_close)
|
|
await self._finish_future
|
|
if self.is_client and self._disconnect_on_finish:
|
|
self.close()
|
|
if self.stream is None:
|
|
return False
|
|
except httputil.HTTPInputError as e:
|
|
gen_log.info("Malformed HTTP message from %s: %s", self.context, e)
|
|
if not self.is_client:
|
|
await self.stream.write(b"HTTP/1.1 400 Bad Request\r\n\r\n")
|
|
self.close()
|
|
return False
|
|
finally:
|
|
if need_delegate_close:
|
|
with _ExceptionLoggingContext(app_log):
|
|
delegate.on_connection_close()
|
|
header_future = None # type: ignore
|
|
self._clear_callbacks()
|
|
return True
|
|
|
|
def _clear_callbacks(self) -> None:
|
|
"""Clears the callback attributes.
|
|
|
|
This allows the request handler to be garbage collected more
|
|
quickly in CPython by breaking up reference cycles.
|
|
"""
|
|
self._write_callback = None
|
|
self._write_future = None # type: Optional[Future[None]]
|
|
self._close_callback = None # type: Optional[Callable[[], None]]
|
|
if self.stream is not None:
|
|
self.stream.set_close_callback(None)
|
|
|
|
def set_close_callback(self, callback: Optional[Callable[[], None]]) -> None:
|
|
"""Sets a callback that will be run when the connection is closed.
|
|
|
|
Note that this callback is slightly different from
|
|
`.HTTPMessageDelegate.on_connection_close`: The
|
|
`.HTTPMessageDelegate` method is called when the connection is
|
|
closed while receiving a message. This callback is used when
|
|
there is not an active delegate (for example, on the server
|
|
side this callback is used if the client closes the connection
|
|
after sending its request but before receiving all the
|
|
response.
|
|
"""
|
|
self._close_callback = callback
|
|
|
|
def _on_connection_close(self) -> None:
|
|
# Note that this callback is only registered on the IOStream
|
|
# when we have finished reading the request and are waiting for
|
|
# the application to produce its response.
|
|
if self._close_callback is not None:
|
|
callback = self._close_callback
|
|
self._close_callback = None
|
|
callback()
|
|
if not self._finish_future.done():
|
|
future_set_result_unless_cancelled(self._finish_future, None)
|
|
self._clear_callbacks()
|
|
|
|
def close(self) -> None:
|
|
if self.stream is not None:
|
|
self.stream.close()
|
|
self._clear_callbacks()
|
|
if not self._finish_future.done():
|
|
future_set_result_unless_cancelled(self._finish_future, None)
|
|
|
|
def detach(self) -> iostream.IOStream:
|
|
"""Take control of the underlying stream.
|
|
|
|
Returns the underlying `.IOStream` object and stops all further
|
|
HTTP processing. May only be called during
|
|
`.HTTPMessageDelegate.headers_received`. Intended for implementing
|
|
protocols like websockets that tunnel over an HTTP handshake.
|
|
"""
|
|
self._clear_callbacks()
|
|
stream = self.stream
|
|
self.stream = None # type: ignore
|
|
if not self._finish_future.done():
|
|
future_set_result_unless_cancelled(self._finish_future, None)
|
|
return stream
|
|
|
|
def set_body_timeout(self, timeout: float) -> None:
|
|
"""Sets the body timeout for a single request.
|
|
|
|
Overrides the value from `.HTTP1ConnectionParameters`.
|
|
"""
|
|
self._body_timeout = timeout
|
|
|
|
def set_max_body_size(self, max_body_size: int) -> None:
|
|
"""Sets the body size limit for a single request.
|
|
|
|
Overrides the value from `.HTTP1ConnectionParameters`.
|
|
"""
|
|
self._max_body_size = max_body_size
|
|
|
|
def write_headers(
|
|
self,
|
|
start_line: Union[httputil.RequestStartLine, httputil.ResponseStartLine],
|
|
headers: httputil.HTTPHeaders,
|
|
chunk: Optional[bytes] = None,
|
|
) -> "Future[None]":
|
|
"""Implements `.HTTPConnection.write_headers`."""
|
|
lines = []
|
|
if self.is_client:
|
|
assert isinstance(start_line, httputil.RequestStartLine)
|
|
self._request_start_line = start_line
|
|
lines.append(utf8("%s %s HTTP/1.1" % (start_line[0], start_line[1])))
|
|
# Client requests with a non-empty body must have either a
|
|
# Content-Length or a Transfer-Encoding.
|
|
self._chunking_output = (
|
|
start_line.method in ("POST", "PUT", "PATCH")
|
|
and "Content-Length" not in headers
|
|
and (
|
|
"Transfer-Encoding" not in headers
|
|
or headers["Transfer-Encoding"] == "chunked"
|
|
)
|
|
)
|
|
else:
|
|
assert isinstance(start_line, httputil.ResponseStartLine)
|
|
assert self._request_start_line is not None
|
|
assert self._request_headers is not None
|
|
self._response_start_line = start_line
|
|
lines.append(utf8("HTTP/1.1 %d %s" % (start_line[1], start_line[2])))
|
|
self._chunking_output = (
|
|
# TODO: should this use
|
|
# self._request_start_line.version or
|
|
# start_line.version?
|
|
self._request_start_line.version == "HTTP/1.1"
|
|
# Omit payload header field for HEAD request.
|
|
and self._request_start_line.method != "HEAD"
|
|
# 1xx, 204 and 304 responses have no body (not even a zero-length
|
|
# body), and so should not have either Content-Length or
|
|
# Transfer-Encoding headers.
|
|
and start_line.code not in (204, 304)
|
|
and (start_line.code < 100 or start_line.code >= 200)
|
|
# No need to chunk the output if a Content-Length is specified.
|
|
and "Content-Length" not in headers
|
|
# Applications are discouraged from touching Transfer-Encoding,
|
|
# but if they do, leave it alone.
|
|
and "Transfer-Encoding" not in headers
|
|
)
|
|
# If connection to a 1.1 client will be closed, inform client
|
|
if (
|
|
self._request_start_line.version == "HTTP/1.1"
|
|
and self._disconnect_on_finish
|
|
):
|
|
headers["Connection"] = "close"
|
|
# If a 1.0 client asked for keep-alive, add the header.
|
|
if (
|
|
self._request_start_line.version == "HTTP/1.0"
|
|
and self._request_headers.get("Connection", "").lower() == "keep-alive"
|
|
):
|
|
headers["Connection"] = "Keep-Alive"
|
|
if self._chunking_output:
|
|
headers["Transfer-Encoding"] = "chunked"
|
|
if not self.is_client and (
|
|
self._request_start_line.method == "HEAD"
|
|
or cast(httputil.ResponseStartLine, start_line).code == 304
|
|
):
|
|
self._expected_content_remaining = 0
|
|
elif "Content-Length" in headers:
|
|
self._expected_content_remaining = int(headers["Content-Length"])
|
|
else:
|
|
self._expected_content_remaining = None
|
|
# TODO: headers are supposed to be of type str, but we still have some
|
|
# cases that let bytes slip through. Remove these native_str calls when those
|
|
# are fixed.
|
|
header_lines = (
|
|
native_str(n) + ": " + native_str(v) for n, v in headers.get_all()
|
|
)
|
|
lines.extend(line.encode("latin1") for line in header_lines)
|
|
for line in lines:
|
|
if b"\n" in line:
|
|
raise ValueError("Newline in header: " + repr(line))
|
|
future = None
|
|
if self.stream.closed():
|
|
future = self._write_future = Future()
|
|
future.set_exception(iostream.StreamClosedError())
|
|
future.exception()
|
|
else:
|
|
future = self._write_future = Future()
|
|
data = b"\r\n".join(lines) + b"\r\n\r\n"
|
|
if chunk:
|
|
data += self._format_chunk(chunk)
|
|
self._pending_write = self.stream.write(data)
|
|
future_add_done_callback(self._pending_write, self._on_write_complete)
|
|
return future
|
|
|
|
def _format_chunk(self, chunk: bytes) -> bytes:
|
|
if self._expected_content_remaining is not None:
|
|
self._expected_content_remaining -= len(chunk)
|
|
if self._expected_content_remaining < 0:
|
|
# Close the stream now to stop further framing errors.
|
|
self.stream.close()
|
|
raise httputil.HTTPOutputError(
|
|
"Tried to write more data than Content-Length"
|
|
)
|
|
if self._chunking_output and chunk:
|
|
# Don't write out empty chunks because that means END-OF-STREAM
|
|
# with chunked encoding
|
|
return utf8("%x" % len(chunk)) + b"\r\n" + chunk + b"\r\n"
|
|
else:
|
|
return chunk
|
|
|
|
def write(self, chunk: bytes) -> "Future[None]":
|
|
"""Implements `.HTTPConnection.write`.
|
|
|
|
For backwards compatibility it is allowed but deprecated to
|
|
skip `write_headers` and instead call `write()` with a
|
|
pre-encoded header block.
|
|
"""
|
|
future = None
|
|
if self.stream.closed():
|
|
future = self._write_future = Future()
|
|
self._write_future.set_exception(iostream.StreamClosedError())
|
|
self._write_future.exception()
|
|
else:
|
|
future = self._write_future = Future()
|
|
self._pending_write = self.stream.write(self._format_chunk(chunk))
|
|
future_add_done_callback(self._pending_write, self._on_write_complete)
|
|
return future
|
|
|
|
def finish(self) -> None:
|
|
"""Implements `.HTTPConnection.finish`."""
|
|
if (
|
|
self._expected_content_remaining is not None
|
|
and self._expected_content_remaining != 0
|
|
and not self.stream.closed()
|
|
):
|
|
self.stream.close()
|
|
raise httputil.HTTPOutputError(
|
|
"Tried to write %d bytes less than Content-Length"
|
|
% self._expected_content_remaining
|
|
)
|
|
if self._chunking_output:
|
|
if not self.stream.closed():
|
|
self._pending_write = self.stream.write(b"0\r\n\r\n")
|
|
self._pending_write.add_done_callback(self._on_write_complete)
|
|
self._write_finished = True
|
|
# If the app finished the request while we're still reading,
|
|
# divert any remaining data away from the delegate and
|
|
# close the connection when we're done sending our response.
|
|
# Closing the connection is the only way to avoid reading the
|
|
# whole input body.
|
|
if not self._read_finished:
|
|
self._disconnect_on_finish = True
|
|
# No more data is coming, so instruct TCP to send any remaining
|
|
# data immediately instead of waiting for a full packet or ack.
|
|
self.stream.set_nodelay(True)
|
|
if self._pending_write is None:
|
|
self._finish_request(None)
|
|
else:
|
|
future_add_done_callback(self._pending_write, self._finish_request)
|
|
|
|
def _on_write_complete(self, future: "Future[None]") -> None:
|
|
exc = future.exception()
|
|
if exc is not None and not isinstance(exc, iostream.StreamClosedError):
|
|
future.result()
|
|
if self._write_callback is not None:
|
|
callback = self._write_callback
|
|
self._write_callback = None
|
|
self.stream.io_loop.add_callback(callback)
|
|
if self._write_future is not None:
|
|
future = self._write_future
|
|
self._write_future = None
|
|
future_set_result_unless_cancelled(future, None)
|
|
|
|
def _can_keep_alive(
|
|
self, start_line: httputil.RequestStartLine, headers: httputil.HTTPHeaders
|
|
) -> bool:
|
|
if self.params.no_keep_alive:
|
|
return False
|
|
connection_header = headers.get("Connection")
|
|
if connection_header is not None:
|
|
connection_header = connection_header.lower()
|
|
if start_line.version == "HTTP/1.1":
|
|
return connection_header != "close"
|
|
elif (
|
|
"Content-Length" in headers
|
|
or headers.get("Transfer-Encoding", "").lower() == "chunked"
|
|
or getattr(start_line, "method", None) in ("HEAD", "GET")
|
|
):
|
|
# start_line may be a request or response start line; only
|
|
# the former has a method attribute.
|
|
return connection_header == "keep-alive"
|
|
return False
|
|
|
|
def _finish_request(self, future: "Optional[Future[None]]") -> None:
|
|
self._clear_callbacks()
|
|
if not self.is_client and self._disconnect_on_finish:
|
|
self.close()
|
|
return
|
|
# Turn Nagle's algorithm back on, leaving the stream in its
|
|
# default state for the next request.
|
|
self.stream.set_nodelay(False)
|
|
if not self._finish_future.done():
|
|
future_set_result_unless_cancelled(self._finish_future, None)
|
|
|
|
def _parse_headers(self, data: bytes) -> Tuple[str, httputil.HTTPHeaders]:
|
|
# The lstrip removes newlines that some implementations sometimes
|
|
# insert between messages of a reused connection. Per RFC 7230,
|
|
# we SHOULD ignore at least one empty line before the request.
|
|
# http://tools.ietf.org/html/rfc7230#section-3.5
|
|
data_str = native_str(data.decode("latin1")).lstrip("\r\n")
|
|
# RFC 7230 section allows for both CRLF and bare LF.
|
|
eol = data_str.find("\n")
|
|
start_line = data_str[:eol].rstrip("\r")
|
|
headers = httputil.HTTPHeaders.parse(data_str[eol:])
|
|
return start_line, headers
|
|
|
|
def _read_body(
|
|
self,
|
|
code: int,
|
|
headers: httputil.HTTPHeaders,
|
|
delegate: httputil.HTTPMessageDelegate,
|
|
) -> Optional[Awaitable[None]]:
|
|
if "Content-Length" in headers:
|
|
if "Transfer-Encoding" in headers:
|
|
# Response cannot contain both Content-Length and
|
|
# Transfer-Encoding headers.
|
|
# http://tools.ietf.org/html/rfc7230#section-3.3.3
|
|
raise httputil.HTTPInputError(
|
|
"Response with both Transfer-Encoding and Content-Length"
|
|
)
|
|
if "," in headers["Content-Length"]:
|
|
# Proxies sometimes cause Content-Length headers to get
|
|
# duplicated. If all the values are identical then we can
|
|
# use them but if they differ it's an error.
|
|
pieces = re.split(r",\s*", headers["Content-Length"])
|
|
if any(i != pieces[0] for i in pieces):
|
|
raise httputil.HTTPInputError(
|
|
"Multiple unequal Content-Lengths: %r"
|
|
% headers["Content-Length"]
|
|
)
|
|
headers["Content-Length"] = pieces[0]
|
|
|
|
try:
|
|
content_length = int(headers["Content-Length"]) # type: Optional[int]
|
|
except ValueError:
|
|
# Handles non-integer Content-Length value.
|
|
raise httputil.HTTPInputError(
|
|
"Only integer Content-Length is allowed: %s"
|
|
% headers["Content-Length"]
|
|
)
|
|
|
|
if cast(int, content_length) > self._max_body_size:
|
|
raise httputil.HTTPInputError("Content-Length too long")
|
|
else:
|
|
content_length = None
|
|
|
|
if code == 204:
|
|
# This response code is not allowed to have a non-empty body,
|
|
# and has an implicit length of zero instead of read-until-close.
|
|
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.3
|
|
if "Transfer-Encoding" in headers or content_length not in (None, 0):
|
|
raise httputil.HTTPInputError(
|
|
"Response with code %d should not have body" % code
|
|
)
|
|
content_length = 0
|
|
|
|
if content_length is not None:
|
|
return self._read_fixed_body(content_length, delegate)
|
|
if headers.get("Transfer-Encoding", "").lower() == "chunked":
|
|
return self._read_chunked_body(delegate)
|
|
if self.is_client:
|
|
return self._read_body_until_close(delegate)
|
|
return None
|
|
|
|
async def _read_fixed_body(
|
|
self, content_length: int, delegate: httputil.HTTPMessageDelegate
|
|
) -> None:
|
|
while content_length > 0:
|
|
body = await 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):
|
|
ret = delegate.data_received(body)
|
|
if ret is not None:
|
|
await ret
|
|
|
|
async def _read_chunked_body(self, delegate: httputil.HTTPMessageDelegate) -> None:
|
|
# TODO: "chunk extensions" http://tools.ietf.org/html/rfc2616#section-3.6.1
|
|
total_size = 0
|
|
while True:
|
|
chunk_len_str = await self.stream.read_until(b"\r\n", max_bytes=64)
|
|
chunk_len = int(chunk_len_str.strip(), 16)
|
|
if chunk_len == 0:
|
|
crlf = await self.stream.read_bytes(2)
|
|
if crlf != b"\r\n":
|
|
raise httputil.HTTPInputError(
|
|
"improperly terminated chunked request"
|
|
)
|
|
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 = await 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):
|
|
ret = delegate.data_received(chunk)
|
|
if ret is not None:
|
|
await ret
|
|
# chunk ends with \r\n
|
|
crlf = await self.stream.read_bytes(2)
|
|
assert crlf == b"\r\n"
|
|
|
|
async def _read_body_until_close(
|
|
self, delegate: httputil.HTTPMessageDelegate
|
|
) -> None:
|
|
body = await self.stream.read_until_close()
|
|
if not self._write_finished or self.is_client:
|
|
with _ExceptionLoggingContext(app_log):
|
|
ret = delegate.data_received(body)
|
|
if ret is not None:
|
|
await ret
|
|
|
|
|
|
class _GzipMessageDelegate(httputil.HTTPMessageDelegate):
|
|
"""Wraps an `HTTPMessageDelegate` to decode ``Content-Encoding: gzip``."""
|
|
|
|
def __init__(self, delegate: httputil.HTTPMessageDelegate, chunk_size: int) -> None:
|
|
self._delegate = delegate
|
|
self._chunk_size = chunk_size
|
|
self._decompressor = None # type: Optional[GzipDecompressor]
|
|
|
|
def headers_received(
|
|
self,
|
|
start_line: Union[httputil.RequestStartLine, httputil.ResponseStartLine],
|
|
headers: httputil.HTTPHeaders,
|
|
) -> Optional[Awaitable[None]]:
|
|
if headers.get("Content-Encoding", "").lower() == "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)
|
|
|
|
async def data_received(self, chunk: bytes) -> None:
|
|
if self._decompressor:
|
|
compressed_data = chunk
|
|
while compressed_data:
|
|
decompressed = self._decompressor.decompress(
|
|
compressed_data, self._chunk_size
|
|
)
|
|
if decompressed:
|
|
ret = self._delegate.data_received(decompressed)
|
|
if ret is not None:
|
|
await ret
|
|
compressed_data = self._decompressor.unconsumed_tail
|
|
if compressed_data and not decompressed:
|
|
raise httputil.HTTPInputError(
|
|
"encountered unconsumed gzip data without making progress"
|
|
)
|
|
else:
|
|
ret = self._delegate.data_received(chunk)
|
|
if ret is not None:
|
|
await ret
|
|
|
|
def finish(self) -> None:
|
|
if self._decompressor is not None:
|
|
tail = self._decompressor.flush()
|
|
if tail:
|
|
# The tail should always be empty: decompress returned
|
|
# all that it can in data_received and the only
|
|
# purpose of the flush call is to detect errors such
|
|
# as truncated input. If we did legitimately get a new
|
|
# chunk at this point we'd need to change the
|
|
# interface to make finish() a coroutine.
|
|
raise ValueError(
|
|
"decompressor.flush returned data; possible truncated input"
|
|
)
|
|
return self._delegate.finish()
|
|
|
|
def on_connection_close(self) -> None:
|
|
return self._delegate.on_connection_close()
|
|
|
|
|
|
class HTTP1ServerConnection(object):
|
|
"""An HTTP/1.x server."""
|
|
|
|
def __init__(
|
|
self,
|
|
stream: iostream.IOStream,
|
|
params: Optional[HTTP1ConnectionParameters] = None,
|
|
context: Optional[object] = None,
|
|
) -> 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 # type: Optional[Future[None]]
|
|
|
|
async def close(self) -> None:
|
|
"""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).
|
|
assert self._serving_future is not None
|
|
try:
|
|
await self._serving_future
|
|
except Exception:
|
|
pass
|
|
|
|
def start_serving(self, delegate: httputil.HTTPServerConnectionDelegate) -> None:
|
|
"""Starts serving requests on this connection.
|
|
|
|
:arg delegate: a `.HTTPServerConnectionDelegate`
|
|
"""
|
|
assert isinstance(delegate, httputil.HTTPServerConnectionDelegate)
|
|
fut = gen.convert_yielded(self._server_request_loop(delegate))
|
|
self._serving_future = fut
|
|
# Register the future on the IOLoop so its errors get logged.
|
|
self.stream.io_loop.add_future(fut, lambda f: f.result())
|
|
|
|
async def _server_request_loop(
|
|
self, delegate: httputil.HTTPServerConnectionDelegate
|
|
) -> None:
|
|
try:
|
|
while True:
|
|
conn = HTTP1Connection(self.stream, False, self.params, self.context)
|
|
request_delegate = delegate.start_request(self, conn)
|
|
try:
|
|
ret = await conn.read_response(request_delegate)
|
|
except (
|
|
iostream.StreamClosedError,
|
|
iostream.UnsatisfiableReadError,
|
|
asyncio.CancelledError,
|
|
):
|
|
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
|
|
await asyncio.sleep(0)
|
|
finally:
|
|
delegate.on_close(self)
|