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def init(self, scope: Scope, receive: Receive, send: Send) -> None:
    super().init(scope)
    assert scope[“type”] == “websocket”
    self._receive = receive
    self._send = send
    self.client_state = WebSocketState.CONNECTING
    self.application_state = WebSocketState.CONNECTING

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def url_for(self, name: str, **path_params: typing.Any) -> URL:
    router: Router = self.scope[“router”]
    url_path = router.url_path_for(name, **path_params)
    return url_path.make_absolute_url(base_url=self.base_url)

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async def receive(self) -> Message:
    “””
    Receive ASGI websocket messages, ensuring valid state transitions.
    “””
    if self.client_state == WebSocketState.CONNECTING:
        message = await self._receive()
        message_type = message[“type”]
        if message_type != “websocket.connect”:
            raise RuntimeError(
                ‘Expected ASGI message “websocket.connect”, ‘
                f“but got {message_type!r}“
            )
        self.client_state = WebSocketState.CONNECTED
        return message
    elif self.client_state == WebSocketState.CONNECTED:
        message = await self._receive()
        message_type = message[“type”]
        if message_type not in {“websocket.receive”, “websocket.disconnect”}:
            raise RuntimeError(
                ‘Expected ASGI message “websocket.receive” or ‘
                f‘“websocket.disconnect”, but got {message_type!r}‘
            )
        if message_type == “websocket.disconnect”:
            self.client_state = WebSocketState.DISCONNECTED
        return message
    else:
        raise RuntimeError(
            ‘Cannot call “receive” once a disconnect message has been received.’
        )

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async def send(self, message: Message) -> None:
    “””
    Send ASGI websocket messages, ensuring valid state transitions.
    “””
    if self.application_state == WebSocketState.CONNECTING:
        message_type = message[“type”]
        if message_type not in {“websocket.accept”, “websocket.close”}:
            raise RuntimeError(
                ‘Expected ASGI message “websocket.accept” or ‘
                f‘“websocket.close”, but got {message_type!r}‘
            )
        if message_type == “websocket.close”:
            self.application_state = WebSocketState.DISCONNECTED
        else:
            self.application_state = WebSocketState.CONNECTED
        await self._send(message)
    elif self.application_state == WebSocketState.CONNECTED:
        message_type = message[“type”]
        if message_type not in {“websocket.send”, “websocket.close”}:
            raise RuntimeError(
                ‘Expected ASGI message “websocket.send” or “websocket.close”, ‘
                f“but got {message_type!r}“
            )
        if message_type == “websocket.close”:
            self.application_state = WebSocketState.DISCONNECTED
        await self._send(message)
    else:
        raise RuntimeError(‘Cannot call “send” once a close message has been sent.’)

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async def accept(
    self,
    subprotocol: typing.Optional[str] = None,
    headers: typing.Optional[typing.Iterable[typing.Tuple[bytes, bytes]]] = None,
) -> None:
    headers = headers or []
    if self.client_state == WebSocketState.CONNECTING:
        # If we haven’t yet seen the ‘connect’ message, then wait for it first.
        await self.receive()
    await self.send(
        {“type”: “websocket.accept”, “subprotocol”: subprotocol, “headers”: headers}
    )

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async def receive_text(self) -> str:
    if self.application_state != WebSocketState.CONNECTED:
        raise RuntimeError(
            ‘WebSocket is not connected. Need to call “accept” first.’
        )
    message = await self.receive()
    self._raise_on_disconnect(message)
    return message[“text”]

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async def receive_bytes(self) -> bytes:
    if self.application_state != WebSocketState.CONNECTED:
        raise RuntimeError(
            ‘WebSocket is not connected. Need to call “accept” first.’
        )
    message = await self.receive()
    self._raise_on_disconnect(message)
    return message[“bytes”]

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async def receive_json(self, mode: str = “text”) -> typing.Any:
    if mode not in {“text”, “binary”}:
        raise RuntimeError(‘The “mode” argument should be “text” or “binary”.’)
    if self.application_state != WebSocketState.CONNECTED:
        raise RuntimeError(
            ‘WebSocket is not connected. Need to call “accept” first.’
        )
    message = await self.receive()
    self._raise_on_disconnect(message)
    if mode == “text”:
        text = message[“text”]
    else:
        text = message[“bytes”].decode(“utf-8”)
    return json.loads(text)

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async def iter_text(self) -> typing.AsyncIterator[str]:
    try:
        while True:
            yield await self.receive_text()
    except WebSocketDisconnect:
        pass

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async def iter_bytes(self) -> typing.AsyncIterator[bytes]:
    try:
        while True:
            yield await self.receive_bytes()
    except WebSocketDisconnect:
        pass

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async def iter_json(self) -> typing.AsyncIterator[typing.Any]:
    try:
        while True:
            yield await self.receive_json()
    except WebSocketDisconnect:
        pass

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async def send_text(self, data: str) -> None:
    await self.send({“type”: “websocket.send”, “text”: data})

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async def send_bytes(self, data: bytes) -> None:
    await self.send({“type”: “websocket.send”, “bytes”: data})

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async def send_json(self, data: typing.Any, mode: str = “text”) -> None:
    if mode not in {“text”, “binary”}:
        raise RuntimeError(‘The “mode” argument should be “text” or “binary”.’)
    text = json.dumps(data, separators=(“,”, “:”))
    if mode == “text”:
        await self.send({“type”: “websocket.send”, “text”: text})
    else:
        await self.send({“type”: “websocket.send”, “bytes”: text.encode(“utf-8”)})

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async def close(
    self, code: int = 1000, reason: typing.Optional[str] = None
) -> None:
    await self.send(
        {“type”: “websocket.close”, “code”: code, “reason”: reason or “”}
    )

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def init(self, code: int = 1000, reason: typing.Optional[str] = None) -> None:
    self.code = code
    self.reason = reason or “”

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def init(self, code: int = 1000, reason: typing.Optional[str] = None) -> None:
    self.code = code
    self.reason = reason or “”