699 lines
27 KiB
Python
699 lines
27 KiB
Python
from tornado.escape import _unicode
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from tornado import gen, version
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from tornado.httpclient import (
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HTTPResponse,
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HTTPError,
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AsyncHTTPClient,
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main,
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_RequestProxy,
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HTTPRequest,
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)
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from tornado import httputil
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from tornado.http1connection import HTTP1Connection, HTTP1ConnectionParameters
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from tornado.ioloop import IOLoop
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from tornado.iostream import StreamClosedError, IOStream
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from tornado.netutil import (
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Resolver,
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OverrideResolver,
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_client_ssl_defaults,
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is_valid_ip,
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)
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from tornado.log import gen_log
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from tornado.tcpclient import TCPClient
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import base64
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import collections
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import copy
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import functools
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import re
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import socket
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import ssl
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import sys
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import time
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from io import BytesIO
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import urllib.parse
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from typing import Dict, Any, Callable, Optional, Type, Union
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from types import TracebackType
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import typing
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if typing.TYPE_CHECKING:
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from typing import Deque, Tuple, List # noqa: F401
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class HTTPTimeoutError(HTTPError):
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"""Error raised by SimpleAsyncHTTPClient on timeout.
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For historical reasons, this is a subclass of `.HTTPClientError`
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which simulates a response code of 599.
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.. versionadded:: 5.1
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"""
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def __init__(self, message: str) -> None:
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super().__init__(599, message=message)
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def __str__(self) -> str:
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return self.message or "Timeout"
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class HTTPStreamClosedError(HTTPError):
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"""Error raised by SimpleAsyncHTTPClient when the underlying stream is closed.
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When a more specific exception is available (such as `ConnectionResetError`),
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it may be raised instead of this one.
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For historical reasons, this is a subclass of `.HTTPClientError`
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which simulates a response code of 599.
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.. versionadded:: 5.1
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"""
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def __init__(self, message: str) -> None:
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super().__init__(599, message=message)
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def __str__(self) -> str:
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return self.message or "Stream closed"
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class SimpleAsyncHTTPClient(AsyncHTTPClient):
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"""Non-blocking HTTP client with no external dependencies.
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This class implements an HTTP 1.1 client on top of Tornado's IOStreams.
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Some features found in the curl-based AsyncHTTPClient are not yet
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supported. In particular, proxies are not supported, connections
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are not reused, and callers cannot select the network interface to be
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used.
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"""
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def initialize( # type: ignore
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self,
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max_clients: int = 10,
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hostname_mapping: Optional[Dict[str, str]] = None,
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max_buffer_size: int = 104857600,
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resolver: Optional[Resolver] = None,
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defaults: Optional[Dict[str, Any]] = None,
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max_header_size: Optional[int] = None,
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max_body_size: Optional[int] = None,
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) -> None:
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"""Creates a AsyncHTTPClient.
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Only a single AsyncHTTPClient instance exists per IOLoop
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in order to provide limitations on the number of pending connections.
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``force_instance=True`` may be used to suppress this behavior.
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Note that because of this implicit reuse, unless ``force_instance``
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is used, only the first call to the constructor actually uses
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its arguments. It is recommended to use the ``configure`` method
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instead of the constructor to ensure that arguments take effect.
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``max_clients`` is the number of concurrent requests that can be
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in progress; when this limit is reached additional requests will be
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queued. Note that time spent waiting in this queue still counts
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against the ``request_timeout``.
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``hostname_mapping`` is a dictionary mapping hostnames to IP addresses.
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It can be used to make local DNS changes when modifying system-wide
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settings like ``/etc/hosts`` is not possible or desirable (e.g. in
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unittests).
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``max_buffer_size`` (default 100MB) is the number of bytes
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that can be read into memory at once. ``max_body_size``
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(defaults to ``max_buffer_size``) is the largest response body
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that the client will accept. Without a
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``streaming_callback``, the smaller of these two limits
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applies; with a ``streaming_callback`` only ``max_body_size``
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does.
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.. versionchanged:: 4.2
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Added the ``max_body_size`` argument.
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"""
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super().initialize(defaults=defaults)
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self.max_clients = max_clients
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self.queue = (
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collections.deque()
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) # type: Deque[Tuple[object, HTTPRequest, Callable[[HTTPResponse], None]]]
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self.active = (
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{}
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) # type: Dict[object, Tuple[HTTPRequest, Callable[[HTTPResponse], None]]]
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self.waiting = (
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{}
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) # type: Dict[object, Tuple[HTTPRequest, Callable[[HTTPResponse], None], object]]
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self.max_buffer_size = max_buffer_size
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self.max_header_size = max_header_size
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self.max_body_size = max_body_size
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# TCPClient could create a Resolver for us, but we have to do it
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# ourselves to support hostname_mapping.
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if resolver:
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self.resolver = resolver
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self.own_resolver = False
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else:
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self.resolver = Resolver()
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self.own_resolver = True
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if hostname_mapping is not None:
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self.resolver = OverrideResolver(
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resolver=self.resolver, mapping=hostname_mapping
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)
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self.tcp_client = TCPClient(resolver=self.resolver)
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def close(self) -> None:
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super().close()
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if self.own_resolver:
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self.resolver.close()
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self.tcp_client.close()
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def fetch_impl(
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self, request: HTTPRequest, callback: Callable[[HTTPResponse], None]
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) -> None:
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key = object()
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self.queue.append((key, request, callback))
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assert request.connect_timeout is not None
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assert request.request_timeout is not None
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timeout_handle = None
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if len(self.active) >= self.max_clients:
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timeout = (
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min(request.connect_timeout, request.request_timeout)
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or request.connect_timeout
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or request.request_timeout
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) # min but skip zero
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if timeout:
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timeout_handle = self.io_loop.add_timeout(
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self.io_loop.time() + timeout,
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functools.partial(self._on_timeout, key, "in request queue"),
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)
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self.waiting[key] = (request, callback, timeout_handle)
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self._process_queue()
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if self.queue:
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gen_log.debug(
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"max_clients limit reached, request queued. "
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"%d active, %d queued requests." % (len(self.active), len(self.queue))
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)
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def _process_queue(self) -> None:
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while self.queue and len(self.active) < self.max_clients:
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key, request, callback = self.queue.popleft()
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if key not in self.waiting:
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continue
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self._remove_timeout(key)
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self.active[key] = (request, callback)
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release_callback = functools.partial(self._release_fetch, key)
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self._handle_request(request, release_callback, callback)
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def _connection_class(self) -> type:
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return _HTTPConnection
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def _handle_request(
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self,
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request: HTTPRequest,
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release_callback: Callable[[], None],
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final_callback: Callable[[HTTPResponse], None],
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) -> None:
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self._connection_class()(
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self,
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request,
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release_callback,
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final_callback,
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self.max_buffer_size,
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self.tcp_client,
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self.max_header_size,
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self.max_body_size,
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)
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def _release_fetch(self, key: object) -> None:
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del self.active[key]
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self._process_queue()
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def _remove_timeout(self, key: object) -> None:
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if key in self.waiting:
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request, callback, timeout_handle = self.waiting[key]
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if timeout_handle is not None:
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self.io_loop.remove_timeout(timeout_handle)
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del self.waiting[key]
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def _on_timeout(self, key: object, info: Optional[str] = None) -> None:
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"""Timeout callback of request.
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Construct a timeout HTTPResponse when a timeout occurs.
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:arg object key: A simple object to mark the request.
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:info string key: More detailed timeout information.
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"""
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request, callback, timeout_handle = self.waiting[key]
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self.queue.remove((key, request, callback))
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error_message = "Timeout {0}".format(info) if info else "Timeout"
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timeout_response = HTTPResponse(
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request,
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599,
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error=HTTPTimeoutError(error_message),
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request_time=self.io_loop.time() - request.start_time,
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)
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self.io_loop.add_callback(callback, timeout_response)
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del self.waiting[key]
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class _HTTPConnection(httputil.HTTPMessageDelegate):
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_SUPPORTED_METHODS = set(
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["GET", "HEAD", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"]
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)
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def __init__(
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self,
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client: Optional[SimpleAsyncHTTPClient],
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request: HTTPRequest,
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release_callback: Callable[[], None],
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final_callback: Callable[[HTTPResponse], None],
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max_buffer_size: int,
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tcp_client: TCPClient,
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max_header_size: int,
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max_body_size: int,
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) -> None:
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self.io_loop = IOLoop.current()
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self.start_time = self.io_loop.time()
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self.start_wall_time = time.time()
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self.client = client
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self.request = request
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self.release_callback = release_callback
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self.final_callback = final_callback
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self.max_buffer_size = max_buffer_size
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self.tcp_client = tcp_client
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self.max_header_size = max_header_size
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self.max_body_size = max_body_size
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self.code = None # type: Optional[int]
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self.headers = None # type: Optional[httputil.HTTPHeaders]
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self.chunks = [] # type: List[bytes]
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self._decompressor = None
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# Timeout handle returned by IOLoop.add_timeout
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self._timeout = None # type: object
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self._sockaddr = None
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IOLoop.current().add_future(
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gen.convert_yielded(self.run()), lambda f: f.result()
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)
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async def run(self) -> None:
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try:
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self.parsed = urllib.parse.urlsplit(_unicode(self.request.url))
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if self.parsed.scheme not in ("http", "https"):
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raise ValueError("Unsupported url scheme: %s" % self.request.url)
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# urlsplit results have hostname and port results, but they
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# didn't support ipv6 literals until python 2.7.
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netloc = self.parsed.netloc
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if "@" in netloc:
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userpass, _, netloc = netloc.rpartition("@")
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host, port = httputil.split_host_and_port(netloc)
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if port is None:
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port = 443 if self.parsed.scheme == "https" else 80
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if re.match(r"^\[.*\]$", host):
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# raw ipv6 addresses in urls are enclosed in brackets
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host = host[1:-1]
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self.parsed_hostname = host # save final host for _on_connect
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if self.request.allow_ipv6 is False:
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af = socket.AF_INET
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else:
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af = socket.AF_UNSPEC
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ssl_options = self._get_ssl_options(self.parsed.scheme)
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source_ip = None
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if self.request.network_interface:
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if is_valid_ip(self.request.network_interface):
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source_ip = self.request.network_interface
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else:
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raise ValueError(
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"Unrecognized IPv4 or IPv6 address for network_interface, got %r"
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% (self.request.network_interface,)
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)
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timeout = (
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min(self.request.connect_timeout, self.request.request_timeout)
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or self.request.connect_timeout
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or self.request.request_timeout
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) # min but skip zero
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if timeout:
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self._timeout = self.io_loop.add_timeout(
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self.start_time + timeout,
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functools.partial(self._on_timeout, "while connecting"),
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)
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stream = await self.tcp_client.connect(
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host,
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port,
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af=af,
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ssl_options=ssl_options,
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max_buffer_size=self.max_buffer_size,
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source_ip=source_ip,
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)
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if self.final_callback is None:
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# final_callback is cleared if we've hit our timeout.
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stream.close()
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return
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self.stream = stream
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self.stream.set_close_callback(self.on_connection_close)
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self._remove_timeout()
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if self.final_callback is None:
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return
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if self.request.request_timeout:
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self._timeout = self.io_loop.add_timeout(
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self.start_time + self.request.request_timeout,
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functools.partial(self._on_timeout, "during request"),
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)
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if (
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self.request.method not in self._SUPPORTED_METHODS
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and not self.request.allow_nonstandard_methods
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):
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raise KeyError("unknown method %s" % self.request.method)
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for key in (
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"proxy_host",
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"proxy_port",
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"proxy_username",
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"proxy_password",
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"proxy_auth_mode",
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):
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if getattr(self.request, key, None):
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raise NotImplementedError("%s not supported" % key)
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if "Connection" not in self.request.headers:
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self.request.headers["Connection"] = "close"
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if "Host" not in self.request.headers:
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if "@" in self.parsed.netloc:
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self.request.headers["Host"] = self.parsed.netloc.rpartition("@")[
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-1
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]
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else:
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self.request.headers["Host"] = self.parsed.netloc
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username, password = None, None
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if self.parsed.username is not None:
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username, password = self.parsed.username, self.parsed.password
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elif self.request.auth_username is not None:
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username = self.request.auth_username
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password = self.request.auth_password or ""
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if username is not None:
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assert password is not None
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if self.request.auth_mode not in (None, "basic"):
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raise ValueError("unsupported auth_mode %s", self.request.auth_mode)
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self.request.headers["Authorization"] = "Basic " + _unicode(
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base64.b64encode(
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httputil.encode_username_password(username, password)
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)
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)
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if self.request.user_agent:
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self.request.headers["User-Agent"] = self.request.user_agent
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elif self.request.headers.get("User-Agent") is None:
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self.request.headers["User-Agent"] = "Tornado/{}".format(version)
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if not self.request.allow_nonstandard_methods:
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# Some HTTP methods nearly always have bodies while others
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# almost never do. Fail in this case unless the user has
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# opted out of sanity checks with allow_nonstandard_methods.
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body_expected = self.request.method in ("POST", "PATCH", "PUT")
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body_present = (
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self.request.body is not None
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or self.request.body_producer is not None
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)
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if (body_expected and not body_present) or (
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body_present and not body_expected
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):
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raise ValueError(
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"Body must %sbe None for method %s (unless "
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"allow_nonstandard_methods is true)"
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% ("not " if body_expected else "", self.request.method)
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)
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if self.request.expect_100_continue:
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self.request.headers["Expect"] = "100-continue"
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if self.request.body is not None:
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# When body_producer is used the caller is responsible for
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# setting Content-Length (or else chunked encoding will be used).
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self.request.headers["Content-Length"] = str(len(self.request.body))
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if (
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self.request.method == "POST"
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and "Content-Type" not in self.request.headers
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):
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self.request.headers[
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"Content-Type"
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] = "application/x-www-form-urlencoded"
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if self.request.decompress_response:
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self.request.headers["Accept-Encoding"] = "gzip"
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req_path = (self.parsed.path or "/") + (
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("?" + self.parsed.query) if self.parsed.query else ""
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)
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self.connection = self._create_connection(stream)
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start_line = httputil.RequestStartLine(self.request.method, req_path, "")
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self.connection.write_headers(start_line, self.request.headers)
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if self.request.expect_100_continue:
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await self.connection.read_response(self)
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else:
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await self._write_body(True)
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except Exception:
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if not self._handle_exception(*sys.exc_info()):
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raise
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|
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def _get_ssl_options(
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self, scheme: str
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) -> Union[None, Dict[str, Any], ssl.SSLContext]:
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if scheme == "https":
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if self.request.ssl_options is not None:
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return self.request.ssl_options
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# If we are using the defaults, don't construct a
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# new SSLContext.
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if (
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self.request.validate_cert
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and self.request.ca_certs is None
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and self.request.client_cert is None
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and self.request.client_key is None
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):
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return _client_ssl_defaults
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ssl_ctx = ssl.create_default_context(
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ssl.Purpose.SERVER_AUTH, cafile=self.request.ca_certs
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)
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if not self.request.validate_cert:
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ssl_ctx.check_hostname = False
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ssl_ctx.verify_mode = ssl.CERT_NONE
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if self.request.client_cert is not None:
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ssl_ctx.load_cert_chain(
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self.request.client_cert, self.request.client_key
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)
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if hasattr(ssl, "OP_NO_COMPRESSION"):
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# See netutil.ssl_options_to_context
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ssl_ctx.options |= ssl.OP_NO_COMPRESSION
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return ssl_ctx
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return None
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|
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def _on_timeout(self, info: Optional[str] = None) -> None:
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"""Timeout callback of _HTTPConnection instance.
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Raise a `HTTPTimeoutError` when a timeout occurs.
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:info string key: More detailed timeout information.
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"""
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self._timeout = None
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error_message = "Timeout {0}".format(info) if info else "Timeout"
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if self.final_callback is not None:
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self._handle_exception(
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HTTPTimeoutError, HTTPTimeoutError(error_message), None
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)
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|
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def _remove_timeout(self) -> None:
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if self._timeout is not None:
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self.io_loop.remove_timeout(self._timeout)
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self._timeout = None
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|
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def _create_connection(self, stream: IOStream) -> HTTP1Connection:
|
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stream.set_nodelay(True)
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connection = HTTP1Connection(
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stream,
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True,
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HTTP1ConnectionParameters(
|
|
no_keep_alive=True,
|
|
max_header_size=self.max_header_size,
|
|
max_body_size=self.max_body_size,
|
|
decompress=bool(self.request.decompress_response),
|
|
),
|
|
self._sockaddr,
|
|
)
|
|
return connection
|
|
|
|
async def _write_body(self, start_read: bool) -> None:
|
|
if self.request.body is not None:
|
|
self.connection.write(self.request.body)
|
|
elif self.request.body_producer is not None:
|
|
fut = self.request.body_producer(self.connection.write)
|
|
if fut is not None:
|
|
await fut
|
|
self.connection.finish()
|
|
if start_read:
|
|
try:
|
|
await self.connection.read_response(self)
|
|
except StreamClosedError:
|
|
if not self._handle_exception(*sys.exc_info()):
|
|
raise
|
|
|
|
def _release(self) -> None:
|
|
if self.release_callback is not None:
|
|
release_callback = self.release_callback
|
|
self.release_callback = None # type: ignore
|
|
release_callback()
|
|
|
|
def _run_callback(self, response: HTTPResponse) -> None:
|
|
self._release()
|
|
if self.final_callback is not None:
|
|
final_callback = self.final_callback
|
|
self.final_callback = None # type: ignore
|
|
self.io_loop.add_callback(final_callback, response)
|
|
|
|
def _handle_exception(
|
|
self,
|
|
typ: "Optional[Type[BaseException]]",
|
|
value: Optional[BaseException],
|
|
tb: Optional[TracebackType],
|
|
) -> bool:
|
|
if self.final_callback:
|
|
self._remove_timeout()
|
|
if isinstance(value, StreamClosedError):
|
|
if value.real_error is None:
|
|
value = HTTPStreamClosedError("Stream closed")
|
|
else:
|
|
value = value.real_error
|
|
self._run_callback(
|
|
HTTPResponse(
|
|
self.request,
|
|
599,
|
|
error=value,
|
|
request_time=self.io_loop.time() - self.start_time,
|
|
start_time=self.start_wall_time,
|
|
)
|
|
)
|
|
|
|
if hasattr(self, "stream"):
|
|
# TODO: this may cause a StreamClosedError to be raised
|
|
# by the connection's Future. Should we cancel the
|
|
# connection more gracefully?
|
|
self.stream.close()
|
|
return True
|
|
else:
|
|
# If our callback has already been called, we are probably
|
|
# catching an exception that is not caused by us but rather
|
|
# some child of our callback. Rather than drop it on the floor,
|
|
# pass it along, unless it's just the stream being closed.
|
|
return isinstance(value, StreamClosedError)
|
|
|
|
def on_connection_close(self) -> None:
|
|
if self.final_callback is not None:
|
|
message = "Connection closed"
|
|
if self.stream.error:
|
|
raise self.stream.error
|
|
try:
|
|
raise HTTPStreamClosedError(message)
|
|
except HTTPStreamClosedError:
|
|
self._handle_exception(*sys.exc_info())
|
|
|
|
async def headers_received(
|
|
self,
|
|
first_line: Union[httputil.ResponseStartLine, httputil.RequestStartLine],
|
|
headers: httputil.HTTPHeaders,
|
|
) -> None:
|
|
assert isinstance(first_line, httputil.ResponseStartLine)
|
|
if self.request.expect_100_continue and first_line.code == 100:
|
|
await self._write_body(False)
|
|
return
|
|
self.code = first_line.code
|
|
self.reason = first_line.reason
|
|
self.headers = headers
|
|
|
|
if self._should_follow_redirect():
|
|
return
|
|
|
|
if self.request.header_callback is not None:
|
|
# Reassemble the start line.
|
|
self.request.header_callback("%s %s %s\r\n" % first_line)
|
|
for k, v in self.headers.get_all():
|
|
self.request.header_callback("%s: %s\r\n" % (k, v))
|
|
self.request.header_callback("\r\n")
|
|
|
|
def _should_follow_redirect(self) -> bool:
|
|
if self.request.follow_redirects:
|
|
assert self.request.max_redirects is not None
|
|
return (
|
|
self.code in (301, 302, 303, 307, 308)
|
|
and self.request.max_redirects > 0
|
|
and self.headers is not None
|
|
and self.headers.get("Location") is not None
|
|
)
|
|
return False
|
|
|
|
def finish(self) -> None:
|
|
assert self.code is not None
|
|
data = b"".join(self.chunks)
|
|
self._remove_timeout()
|
|
original_request = getattr(self.request, "original_request", self.request)
|
|
if self._should_follow_redirect():
|
|
assert isinstance(self.request, _RequestProxy)
|
|
new_request = copy.copy(self.request.request)
|
|
new_request.url = urllib.parse.urljoin(
|
|
self.request.url, self.headers["Location"]
|
|
)
|
|
new_request.max_redirects = self.request.max_redirects - 1
|
|
del new_request.headers["Host"]
|
|
# https://tools.ietf.org/html/rfc7231#section-6.4
|
|
#
|
|
# The original HTTP spec said that after a 301 or 302
|
|
# redirect, the request method should be preserved.
|
|
# However, browsers implemented this by changing the
|
|
# method to GET, and the behavior stuck. 303 redirects
|
|
# always specified this POST-to-GET behavior, arguably
|
|
# for *all* methods, but libcurl < 7.70 only does this
|
|
# for POST, while libcurl >= 7.70 does it for other methods.
|
|
if (self.code == 303 and self.request.method != "HEAD") or (
|
|
self.code in (301, 302) and self.request.method == "POST"
|
|
):
|
|
new_request.method = "GET"
|
|
new_request.body = None
|
|
for h in [
|
|
"Content-Length",
|
|
"Content-Type",
|
|
"Content-Encoding",
|
|
"Transfer-Encoding",
|
|
]:
|
|
try:
|
|
del self.request.headers[h]
|
|
except KeyError:
|
|
pass
|
|
new_request.original_request = original_request
|
|
final_callback = self.final_callback
|
|
self.final_callback = None
|
|
self._release()
|
|
fut = self.client.fetch(new_request, raise_error=False)
|
|
fut.add_done_callback(lambda f: final_callback(f.result()))
|
|
self._on_end_request()
|
|
return
|
|
if self.request.streaming_callback:
|
|
buffer = BytesIO()
|
|
else:
|
|
buffer = BytesIO(data) # TODO: don't require one big string?
|
|
response = HTTPResponse(
|
|
original_request,
|
|
self.code,
|
|
reason=getattr(self, "reason", None),
|
|
headers=self.headers,
|
|
request_time=self.io_loop.time() - self.start_time,
|
|
start_time=self.start_wall_time,
|
|
buffer=buffer,
|
|
effective_url=self.request.url,
|
|
)
|
|
self._run_callback(response)
|
|
self._on_end_request()
|
|
|
|
def _on_end_request(self) -> None:
|
|
self.stream.close()
|
|
|
|
def data_received(self, chunk: bytes) -> None:
|
|
if self._should_follow_redirect():
|
|
# We're going to follow a redirect so just discard the body.
|
|
return
|
|
if self.request.streaming_callback is not None:
|
|
self.request.streaming_callback(chunk)
|
|
else:
|
|
self.chunks.append(chunk)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
AsyncHTTPClient.configure(SimpleAsyncHTTPClient)
|
|
main()
|