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150 lines
4.7 KiB
Python
150 lines
4.7 KiB
Python
from __future__ import annotations
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import io
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import itertools
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import sys
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import typing
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from .._models import Request, Response
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from .._types import SyncByteStream
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from .base import BaseTransport
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if typing.TYPE_CHECKING:
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from _typeshed import OptExcInfo # pragma: no cover
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from _typeshed.wsgi import WSGIApplication # pragma: no cover
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_T = typing.TypeVar("_T")
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__all__ = ["WSGITransport"]
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def _skip_leading_empty_chunks(body: typing.Iterable[_T]) -> typing.Iterable[_T]:
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body = iter(body)
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for chunk in body:
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if chunk:
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return itertools.chain([chunk], body)
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return []
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class WSGIByteStream(SyncByteStream):
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def __init__(self, result: typing.Iterable[bytes]) -> None:
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self._close = getattr(result, "close", None)
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self._result = _skip_leading_empty_chunks(result)
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def __iter__(self) -> typing.Iterator[bytes]:
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for part in self._result:
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yield part
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def close(self) -> None:
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if self._close is not None:
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self._close()
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class WSGITransport(BaseTransport):
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"""
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A custom transport that handles sending requests directly to an WSGI app.
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The simplest way to use this functionality is to use the `app` argument.
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```
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client = httpx.Client(app=app)
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```
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Alternatively, you can setup the transport instance explicitly.
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This allows you to include any additional configuration arguments specific
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to the WSGITransport class:
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```
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transport = httpx.WSGITransport(
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app=app,
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script_name="/submount",
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remote_addr="1.2.3.4"
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)
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client = httpx.Client(transport=transport)
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```
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Arguments:
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* `app` - The WSGI application.
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* `raise_app_exceptions` - Boolean indicating if exceptions in the application
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should be raised. Default to `True`. Can be set to `False` for use cases
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such as testing the content of a client 500 response.
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* `script_name` - The root path on which the WSGI application should be mounted.
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* `remote_addr` - A string indicating the client IP of incoming requests.
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```
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"""
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def __init__(
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self,
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app: WSGIApplication,
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raise_app_exceptions: bool = True,
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script_name: str = "",
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remote_addr: str = "127.0.0.1",
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wsgi_errors: typing.TextIO | None = None,
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) -> None:
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self.app = app
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self.raise_app_exceptions = raise_app_exceptions
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self.script_name = script_name
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self.remote_addr = remote_addr
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self.wsgi_errors = wsgi_errors
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def handle_request(self, request: Request) -> Response:
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request.read()
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wsgi_input = io.BytesIO(request.content)
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port = request.url.port or {"http": 80, "https": 443}[request.url.scheme]
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environ = {
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"wsgi.version": (1, 0),
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"wsgi.url_scheme": request.url.scheme,
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"wsgi.input": wsgi_input,
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"wsgi.errors": self.wsgi_errors or sys.stderr,
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"wsgi.multithread": True,
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"wsgi.multiprocess": False,
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"wsgi.run_once": False,
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"REQUEST_METHOD": request.method,
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"SCRIPT_NAME": self.script_name,
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"PATH_INFO": request.url.path,
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"QUERY_STRING": request.url.query.decode("ascii"),
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"SERVER_NAME": request.url.host,
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"SERVER_PORT": str(port),
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"SERVER_PROTOCOL": "HTTP/1.1",
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"REMOTE_ADDR": self.remote_addr,
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}
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for header_key, header_value in request.headers.raw:
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key = header_key.decode("ascii").upper().replace("-", "_")
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if key not in ("CONTENT_TYPE", "CONTENT_LENGTH"):
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key = "HTTP_" + key
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environ[key] = header_value.decode("ascii")
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seen_status = None
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seen_response_headers = None
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seen_exc_info = None
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def start_response(
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status: str,
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response_headers: list[tuple[str, str]],
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exc_info: OptExcInfo | None = None,
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) -> typing.Callable[[bytes], typing.Any]:
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nonlocal seen_status, seen_response_headers, seen_exc_info
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seen_status = status
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seen_response_headers = response_headers
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seen_exc_info = exc_info
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return lambda _: None
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result = self.app(environ, start_response)
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stream = WSGIByteStream(result)
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assert seen_status is not None
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assert seen_response_headers is not None
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if seen_exc_info and seen_exc_info[0] and self.raise_app_exceptions:
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raise seen_exc_info[1]
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status_code = int(seen_status.split()[0])
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headers = [
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(key.encode("ascii"), value.encode("ascii"))
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for key, value in seen_response_headers
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]
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return Response(status_code, headers=headers, stream=stream)
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