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.venv2/Lib/site-packages/starlette/middleware/wsgi.py

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+import io
+import math
+import sys
+import typing
+import warnings
+
+import anyio
+from anyio.abc import ObjectReceiveStream, ObjectSendStream
+
+from starlette.types import Receive, Scope, Send
+
+warnings.warn(
+    "starlette.middleware.wsgi is deprecated and will be removed in a future release. "
+    "Please refer to https://github.com/abersheeran/a2wsgi as a replacement.",
+    DeprecationWarning,
+)
+
+
+def build_environ(scope: Scope, body: bytes) -> typing.Dict[str, typing.Any]:
+    """
+    Builds a scope and request body into a WSGI environ object.
+    """
+
+    script_name = scope.get("root_path", "").encode("utf8").decode("latin1")
+    path_info = scope["path"].encode("utf8").decode("latin1")
+    if path_info.startswith(script_name):
+        path_info = path_info[len(script_name) :]
+
+    environ = {
+        "REQUEST_METHOD": scope["method"],
+        "SCRIPT_NAME": script_name,
+        "PATH_INFO": path_info,
+        "QUERY_STRING": scope["query_string"].decode("ascii"),
+        "SERVER_PROTOCOL": f"HTTP/{scope['http_version']}",
+        "wsgi.version": (1, 0),
+        "wsgi.url_scheme": scope.get("scheme", "http"),
+        "wsgi.input": io.BytesIO(body),
+        "wsgi.errors": sys.stdout,
+        "wsgi.multithread": True,
+        "wsgi.multiprocess": True,
+        "wsgi.run_once": False,
+    }
+
+    # Get server name and port - required in WSGI, not in ASGI
+    server = scope.get("server") or ("localhost", 80)
+    environ["SERVER_NAME"] = server[0]
+    environ["SERVER_PORT"] = server[1]
+
+    # Get client IP address
+    if scope.get("client"):
+        environ["REMOTE_ADDR"] = scope["client"][0]
+
+    # Go through headers and make them into environ entries
+    for name, value in scope.get("headers", []):
+        name = name.decode("latin1")
+        if name == "content-length":
+            corrected_name = "CONTENT_LENGTH"
+        elif name == "content-type":
+            corrected_name = "CONTENT_TYPE"
+        else:
+            corrected_name = f"HTTP_{name}".upper().replace("-", "_")
+        # HTTPbis say only ASCII chars are allowed in headers, but we latin1 just in
+        # case
+        value = value.decode("latin1")
+        if corrected_name in environ:
+            value = environ[corrected_name] + "," + value
+        environ[corrected_name] = value
+    return environ
+
+
+class WSGIMiddleware:
+    def __init__(self, app: typing.Callable[..., typing.Any]) -> None:
+        self.app = app
+
+    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
+        assert scope["type"] == "http"
+        responder = WSGIResponder(self.app, scope)
+        await responder(receive, send)
+
+
+class WSGIResponder:
+    stream_send: ObjectSendStream[typing.MutableMapping[str, typing.Any]]
+    stream_receive: ObjectReceiveStream[typing.MutableMapping[str, typing.Any]]
+
+    def __init__(self, app: typing.Callable[..., typing.Any], scope: Scope) -> None:
+        self.app = app
+        self.scope = scope
+        self.status = None
+        self.response_headers = None
+        self.stream_send, self.stream_receive = anyio.create_memory_object_stream(
+            math.inf
+        )
+        self.response_started = False
+        self.exc_info: typing.Any = None
+
+    async def __call__(self, receive: Receive, send: Send) -> None:
+        body = b""
+        more_body = True
+        while more_body:
+            message = await receive()
+            body += message.get("body", b"")
+            more_body = message.get("more_body", False)
+        environ = build_environ(self.scope, body)
+
+        async with anyio.create_task_group() as task_group:
+            task_group.start_soon(self.sender, send)
+            async with self.stream_send:
+                await anyio.to_thread.run_sync(self.wsgi, environ, self.start_response)
+        if self.exc_info is not None:
+            raise self.exc_info[0].with_traceback(self.exc_info[1], self.exc_info[2])
+
+    async def sender(self, send: Send) -> None:
+        async with self.stream_receive:
+            async for message in self.stream_receive:
+                await send(message)
+
+    def start_response(
+        self,
+        status: str,
+        response_headers: typing.List[typing.Tuple[str, str]],
+        exc_info: typing.Any = None,
+    ) -> None:
+        self.exc_info = exc_info
+        if not self.response_started:
+            self.response_started = True
+            status_code_string, _ = status.split(" ", 1)
+            status_code = int(status_code_string)
+            headers = [
+                (name.strip().encode("ascii").lower(), value.strip().encode("ascii"))
+                for name, value in response_headers
+            ]
+            anyio.from_thread.run(
+                self.stream_send.send,
+                {
+                    "type": "http.response.start",
+                    "status": status_code,
+                    "headers": headers,
+                },
+            )
+
+    def wsgi(
+        self,
+        environ: typing.Dict[str, typing.Any],
+        start_response: typing.Callable[..., typing.Any],
+    ) -> None:
+        for chunk in self.app(environ, start_response):
+            anyio.from_thread.run(
+                self.stream_send.send,
+                {"type": "http.response.body", "body": chunk, "more_body": True},
+            )
+
+        anyio.from_thread.run(
+            self.stream_send.send, {"type": "http.response.body", "body": b""}
+        )