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277 lines
9.3 KiB
277 lines
9.3 KiB
6 months ago
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from __future__ import annotations
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import json as _json
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import logging
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import typing
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from contextlib import contextmanager
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from dataclasses import dataclass
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from http.client import HTTPException as HTTPException
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from io import BytesIO, IOBase
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from ...exceptions import InvalidHeader, TimeoutError
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from ...response import BaseHTTPResponse
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from ...util.retry import Retry
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from .request import EmscriptenRequest
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if typing.TYPE_CHECKING:
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from ..._base_connection import BaseHTTPConnection, BaseHTTPSConnection
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log = logging.getLogger(__name__)
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@dataclass
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class EmscriptenResponse:
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status_code: int
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headers: dict[str, str]
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body: IOBase | bytes
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request: EmscriptenRequest
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class EmscriptenHttpResponseWrapper(BaseHTTPResponse):
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def __init__(
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self,
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internal_response: EmscriptenResponse,
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url: str | None = None,
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connection: BaseHTTPConnection | BaseHTTPSConnection | None = None,
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):
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self._pool = None # set by pool class
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self._body = None
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self._response = internal_response
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self._url = url
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self._connection = connection
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self._closed = False
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super().__init__(
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headers=internal_response.headers,
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status=internal_response.status_code,
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request_url=url,
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version=0,
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reason="",
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decode_content=True,
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)
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self.length_remaining = self._init_length(self._response.request.method)
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self.length_is_certain = False
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@property
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def url(self) -> str | None:
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return self._url
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@url.setter
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def url(self, url: str | None) -> None:
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self._url = url
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@property
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def connection(self) -> BaseHTTPConnection | BaseHTTPSConnection | None:
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return self._connection
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@property
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def retries(self) -> Retry | None:
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return self._retries
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@retries.setter
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def retries(self, retries: Retry | None) -> None:
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# Override the request_url if retries has a redirect location.
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self._retries = retries
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def stream(
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self, amt: int | None = 2**16, decode_content: bool | None = None
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) -> typing.Generator[bytes, None, None]:
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"""
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A generator wrapper for the read() method. A call will block until
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``amt`` bytes have been read from the connection or until the
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connection is closed.
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:param amt:
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How much of the content to read. The generator will return up to
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much data per iteration, but may return less. This is particularly
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likely when using compressed data. However, the empty string will
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never be returned.
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:param decode_content:
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If True, will attempt to decode the body based on the
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'content-encoding' header.
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"""
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while True:
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data = self.read(amt=amt, decode_content=decode_content)
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if data:
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yield data
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else:
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break
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def _init_length(self, request_method: str | None) -> int | None:
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length: int | None
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content_length: str | None = self.headers.get("content-length")
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if content_length is not None:
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try:
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# RFC 7230 section 3.3.2 specifies multiple content lengths can
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# be sent in a single Content-Length header
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# (e.g. Content-Length: 42, 42). This line ensures the values
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# are all valid ints and that as long as the `set` length is 1,
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# all values are the same. Otherwise, the header is invalid.
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lengths = {int(val) for val in content_length.split(",")}
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if len(lengths) > 1:
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raise InvalidHeader(
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"Content-Length contained multiple "
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"unmatching values (%s)" % content_length
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)
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length = lengths.pop()
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except ValueError:
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length = None
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else:
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if length < 0:
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length = None
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else: # if content_length is None
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length = None
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# Check for responses that shouldn't include a body
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if (
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self.status in (204, 304)
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or 100 <= self.status < 200
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or request_method == "HEAD"
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):
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length = 0
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return length
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def read(
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self,
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amt: int | None = None,
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decode_content: bool | None = None, # ignored because browser decodes always
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cache_content: bool = False,
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) -> bytes:
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if (
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self._closed
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or self._response is None
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or (isinstance(self._response.body, IOBase) and self._response.body.closed)
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):
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return b""
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with self._error_catcher():
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# body has been preloaded as a string by XmlHttpRequest
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if not isinstance(self._response.body, IOBase):
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self.length_remaining = len(self._response.body)
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self.length_is_certain = True
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# wrap body in IOStream
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self._response.body = BytesIO(self._response.body)
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if amt is not None:
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# don't cache partial content
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cache_content = False
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data = self._response.body.read(amt)
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if self.length_remaining is not None:
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self.length_remaining = max(self.length_remaining - len(data), 0)
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if (self.length_is_certain and self.length_remaining == 0) or len(
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data
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) < amt:
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# definitely finished reading, close response stream
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self._response.body.close()
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return typing.cast(bytes, data)
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else: # read all we can (and cache it)
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data = self._response.body.read()
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if cache_content:
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self._body = data
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if self.length_remaining is not None:
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self.length_remaining = max(self.length_remaining - len(data), 0)
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if len(data) == 0 or (
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self.length_is_certain and self.length_remaining == 0
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):
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# definitely finished reading, close response stream
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self._response.body.close()
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return typing.cast(bytes, data)
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def read_chunked(
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self,
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amt: int | None = None,
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decode_content: bool | None = None,
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) -> typing.Generator[bytes, None, None]:
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# chunked is handled by browser
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while True:
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bytes = self.read(amt, decode_content)
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if not bytes:
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break
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yield bytes
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def release_conn(self) -> None:
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if not self._pool or not self._connection:
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return None
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self._pool._put_conn(self._connection)
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self._connection = None
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def drain_conn(self) -> None:
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self.close()
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@property
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def data(self) -> bytes:
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if self._body:
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return self._body
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else:
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return self.read(cache_content=True)
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def json(self) -> typing.Any:
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"""
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Parses the body of the HTTP response as JSON.
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To use a custom JSON decoder pass the result of :attr:`HTTPResponse.data` to the decoder.
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This method can raise either `UnicodeDecodeError` or `json.JSONDecodeError`.
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Read more :ref:`here <json>`.
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"""
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data = self.data.decode("utf-8")
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return _json.loads(data)
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def close(self) -> None:
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if not self._closed:
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if isinstance(self._response.body, IOBase):
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self._response.body.close()
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if self._connection:
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self._connection.close()
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self._connection = None
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self._closed = True
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@contextmanager
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def _error_catcher(self) -> typing.Generator[None, None, None]:
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"""
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Catch Emscripten specific exceptions thrown by fetch.py,
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instead re-raising urllib3 variants, so that low-level exceptions
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are not leaked in the high-level api.
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On exit, release the connection back to the pool.
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"""
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from .fetch import _RequestError, _TimeoutError # avoid circular import
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clean_exit = False
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try:
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yield
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# If no exception is thrown, we should avoid cleaning up
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# unnecessarily.
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clean_exit = True
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except _TimeoutError as e:
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raise TimeoutError(str(e))
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except _RequestError as e:
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raise HTTPException(str(e))
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finally:
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# If we didn't terminate cleanly, we need to throw away our
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# connection.
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if not clean_exit:
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# The response may not be closed but we're not going to use it
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# anymore so close it now
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if (
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isinstance(self._response.body, IOBase)
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and not self._response.body.closed
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):
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self._response.body.close()
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# release the connection back to the pool
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self.release_conn()
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else:
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# If we have read everything from the response stream,
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# return the connection back to the pool.
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if (
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isinstance(self._response.body, IOBase)
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and self._response.body.closed
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):
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self.release_conn()
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