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How to use populate_wsgi_environment method in localstack

Best Python code snippet using localstack_python
asgi.py
Source:asgi.py
...8from urllib.parse import quote, unquote, urlparse9if t.TYPE_CHECKING:10    from _typeshed import WSGIApplication, WSGIEnvironment11    from hypercorn.typing import ASGIReceiveCallable, ASGISendCallable, HTTPScope, Scope12def populate_wsgi_environment(environ: "WSGIEnvironment", scope: "HTTPScope"):13    """14    Adds the non-IO parts (e.g., excluding wsgi.input) from the ASGI HTTPScope to the WSGI Environment.15    :param environ: the WSGI environment to populate16    :param scope: the ASGI scope as source17    """18    environ["REQUEST_METHOD"] = scope["method"]19    # path/uri info20    # prepare the paths for the "WSGI decoding dance" done by werkzeug21    environ["SCRIPT_NAME"] = unquote(quote(scope.get("root_path", "").rstrip("/")), "latin-1")22    path = scope["path"]23    path = path if path[0] == "/" else urlparse(path).path24    environ["PATH_INFO"] = unquote(quote(path), "latin-1")25    query_string = scope.get("query_string")26    if query_string:27        raw_uri = scope["raw_path"] + b"?" + query_string28        environ["QUERY_STRING"] = query_string.decode("latin1")29    else:30        raw_uri = scope["raw_path"]31    environ["RAW_URI"] = environ["REQUEST_URI"] = raw_uri.decode("utf-8")32    # server address / host33    server = scope.get("server") or ("localhost", 80)34    environ["SERVER_NAME"] = server[0]35    environ["SERVER_PORT"] = str(server[1]) if server[1] else "80"36    # http version37    environ["SERVER_PROTOCOL"] = "HTTP/" + scope["http_version"]38    # client (remote) address39    client = scope.get("client")40    if client:41        environ["REMOTE_ADDR"] = client[0]42        environ["REMOTE_PORT"] = str(client[1])43    # headers44    for name, value in scope["headers"]:45        key = name.decode("latin1").upper().replace("-", "_")46        if key not in ["CONTENT_TYPE", "CONTENT_LENGTH"]:47            key = f"HTTP_{key}"48        environ[key] = value.decode("latin1")49    # wsgi specific keys50    environ["wsgi.version"] = (1, 0)51    environ["wsgi.url_scheme"] = scope.get("scheme", "http")52    environ["wsgi.errors"] = io.BytesIO()53    environ["wsgi.multithread"] = True54    environ["wsgi.multiprocess"] = False55    environ["wsgi.run_once"] = False56    # custom key to allow downstream applications to circumvent WSGI header processing57    environ["asgi.headers"] = scope.get("headers")58async def to_async_generator(59    it: t.Iterator,60    loop: t.Optional[AbstractEventLoop] = None,61    executor: t.Optional[Executor] = None,62) -> t.AsyncGenerator:63    """64    Wraps a given synchronous Iterator as an async generator, where each invocation to ``next(it)``65    will be wrapped in a coroutine execution.66    :param it: the iterator to wrap67    :param loop: the event loop to run the next invocations68    :param executor: the executor to run the synchronous code69    :return: an async generator70    """71    loop = loop or asyncio.get_event_loop()72    stop = object()73    def _next_sync():74        try:75            # this call may potentially call blocking IO, which is why we call it in an executor76            return next(it)77        except StopIteration:78            return stop79    while True:80        val = await loop.run_in_executor(executor, _next_sync)81        if val is stop:82            return83        yield val84class HTTPRequestEventStreamAdapter:85    """86    An adapter to expose an ASGIReceiveCallable coroutine that returns HTTPRequestEvent87    instances, as a PEP 3333 InputStream for consumption in synchronous WSGI/Werkzeug code.88    """89    def __init__(90        self, receive: "ASGIReceiveCallable", event_loop: t.Optional[AbstractEventLoop] = None91    ) -> None:92        super().__init__()93        self.receive = receive94        self.event_loop = event_loop or asyncio.get_event_loop()95        self._more_body = True96        self._buffer = bytearray()97    def _read_into(self, buf: bytearray) -> t.Tuple[int, bool]:98        if not self._more_body:99            return 0, False100        recv_future = asyncio.run_coroutine_threadsafe(self.receive(), self.event_loop)101        event = recv_future.result()102        # TODO: disconnect events103        body = event["body"]104        more = event.get("more_body", False)105        buf.extend(body)106        self._more_body = more107        return len(body), more108    def read(self, size: t.Optional[int] = None) -> bytes:109        """110        Reads up to ``size`` bytes from the object and returns them. As a convenience, if ``size`` is unspecified or111        ``-1``, all bytes until EOF are returned. Like RawIOBase specifies, only one system call is ever made (in112        this case, a call to the ASGI receive callable). Fewer than ``size`` bytes may be returned if the underlying113        call returns fewer than ``size`` bytes.114        :param size: the number of bytes to read115        :return:116        """117        buf = self._buffer118        if not buf and not self._more_body:119            return b""120        if size is None or size == -1:121            while True:122                read, more = self._read_into(buf)123                if not more:124                    break125            arr = bytes(buf)126            buf.clear()127            return arr128        if len(buf) < size:129            self._read_into(buf)130        copy = bytes(buf[:size])131        self._buffer = buf[size:]132        return copy133    def readline(self, size: t.Optional[int] = None) -> bytes:134        buf = self._buffer135        size = size if size is not None else -1136        while True:137            i = buf.find(b"\n")  # FIXME: scans the whole buffer every time138            if i >= 0:139                if 0 < size < i:140                    break  # no '\n' in range141                else:142                    arr = bytes(buf[: (i + 1)])143                    self._buffer = buf[(i + 1) :]144                    return arr145            # ensure the buffer has at least `size` bytes (or all)146            if size > 0:147                if len(buf) >= size:148                    break149            _, more = self._read_into(buf)150            if not more:151                break152        if size > 0:153            arr = bytes(buf[:size])154            self._buffer = buf[size:]155            return arr156        else:157            arr = bytes(buf)158            buf.clear()159            return arr160    def readlines(self, size: t.Optional[int] = None) -> t.List[bytes]:161        if size is None or size < 0:162            return [line for line in self]163        lines = []164        while size > 0:165            try:166                line = self.__next__()167            except StopIteration:168                return lines169            lines.append(line)170            size = size - len(line)171        return lines172    def __next__(self):173        line = self.readline()174        if line == b"" and not self._more_body:175            raise StopIteration()176        return line177    def __iter__(self):178        return self179class WsgiStartResponse:180    """181    A wrapper that exposes an async ``ASGISendCallable`` as synchronous a WSGI ``StartResponse`` protocol callable.182    See this stackoverflow post for a good explanation: https://stackoverflow.com/a/16775731/804840.183    """184    def __init__(185        self,186        send: "ASGISendCallable",187        event_loop: AbstractEventLoop = None,188    ):189        self.send = send190        self.event_loop = event_loop or asyncio.get_event_loop()191        self.sent = 0192        self.content_length = math.inf193        self.finalized = False194        self.started = False195    def __call__(196        self, status: str, headers: t.List[t.Tuple[str, str]], exec_info=None197    ) -> t.Callable[[bytes], t.Any]:198        return self.start_response_sync(status, headers, exec_info)199    def start_response_sync(200        self, status: str, headers: t.List[t.Tuple[str, str]], exec_info=None201    ) -> t.Callable[[bytes], t.Any]:202        """203        The WSGI start_response protocol.204        :param status: the HTTP status (e.g., ``200 OK``) to write205        :param headers: the HTTP headers to write206        :param exec_info: ignored207        :return: a callable that lets you write bytes to the response body208        """209        send = self.send210        loop = self.event_loop211        # start sending response212        asyncio.run_coroutine_threadsafe(213            send(214                {215                    "type": "http.response.start",216                    "status": int(status[:3]),217                    "headers": [(h[0].encode("latin1"), h[1].encode("latin1")) for h in headers],218                }219            ),220            loop,221        ).result()222        self.started = True223        # find out content length if set224        self.content_length = math.inf  # unknown content-length225        for k, v in headers:226            if k.lower() == "content-length":227                self.content_length = int(v)228                break229        return self.write_sync230    def write_sync(self, data: bytes) -> None:231        return asyncio.run_coroutine_threadsafe(self.write(data), self.event_loop).result()232    async def write(self, data: bytes) -> None:233        if not self.started:234            raise ValueError("not started the response yet")235        await self.send({"type": "http.response.body", "body": data, "more_body": True})236        self.sent += len(data)237        if self.sent >= self.content_length:238            await self.close()239    async def close(self):240        if not self.started:241            raise ValueError("not started the response yet")242        if not self.finalized:243            self.finalized = True244            await self.send({"type": "http.response.body", "body": b"", "more_body": False})245class ASGIAdapter:246    """247    Adapter to expose a WSGIApplication as an ASGI3Application. This allows you to serve synchronous WSGI applications248    through ASGI servers (e.g., Hypercorn).249    https://asgi.readthedocs.io/en/latest/specs/main.html250    """251    def __init__(252        self,253        wsgi_app: "WSGIApplication",254        event_loop: AbstractEventLoop = None,255        executor: Executor = None,256    ):257        self.wsgi_app = wsgi_app258        self.event_loop = event_loop or asyncio.get_event_loop()259        self.executor = executor260    async def __call__(261        self, scope: "Scope", receive: "ASGIReceiveCallable", send: "ASGISendCallable"262    ):263        """264        The ASGI 3 interface. Can only handle HTTP calls.265        :param scope: the connection scope266        :param receive: the receive callable267        :param send: the send callable268        """269        if scope["type"] == "http":270            return await self.handle_http(scope, receive, send)271        raise NotImplementedError("Unhandled protocol %s" % scope["type"])272    def to_wsgi_environment(273        self,274        scope: "HTTPScope",275        receive: "ASGIReceiveCallable",276    ) -> "WSGIEnvironment":277        """278        Creates an IO-ready WSGIEnvironment from the given ASGI HTTP call.279        :param scope: the ASGI HTTP Scope280        :param receive: the ASGI callable to receive the HTTP request281        :return: a WSGIEnvironment282        """283        environ: "WSGIEnvironment" = {}284        populate_wsgi_environment(environ, scope)285        # add IO wrappers286        environ["wsgi.input"] = HTTPRequestEventStreamAdapter(receive, event_loop=self.event_loop)287        environ[288            "wsgi.input_terminated"289        ] = True  # indicates that the stream is EOF terminated per request290        return environ291    async def handle_http(292        self, scope: "HTTPScope", receive: "ASGIReceiveCallable", send: "ASGISendCallable"293    ):294        env = self.to_wsgi_environment(scope, receive)295        response = WsgiStartResponse(send, self.event_loop)296        iterable = await self.event_loop.run_in_executor(297            self.executor, self.wsgi_app, env, response298        )...
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