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from typing import TYPE_CHECKING

from pydantic import BaseModel  # type: ignore
from sentry_sdk.consts import OP
from sentry_sdk.hub import Hub, _should_send_default_pii
from sentry_sdk.integrations import DidNotEnable, Integration
from sentry_sdk.integrations.asgi import SentryAsgiMiddleware
from sentry_sdk.tracing import SOURCE_FOR_STYLE, TRANSACTION_SOURCE_ROUTE
from sentry_sdk.utils import event_from_exception, transaction_from_function

try:
    from starlite import Request, Starlite, State  # type: ignore
    from starlite.handlers.base import BaseRouteHandler  # type: ignore
    from starlite.middleware import DefineMiddleware  # type: ignore
    from starlite.plugins.base import get_plugin_for_value  # type: ignore
    from starlite.routes.http import HTTPRoute  # type: ignore
    from starlite.utils import ConnectionDataExtractor, is_async_callable, Ref  # type: ignore

    if TYPE_CHECKING:
        from typing import Any, Dict, List, Optional, Union
        from starlite.types import (  # type: ignore
            ASGIApp,
            HTTPReceiveMessage,
            HTTPScope,
            Message,
            Middleware,
            Receive,
            Scope,
            Send,
            WebSocketReceiveMessage,
        )
        from starlite import MiddlewareProtocol
        from sentry_sdk._types import Event
except ImportError:
    raise DidNotEnable("Starlite is not installed")


_DEFAULT_TRANSACTION_NAME = "generic Starlite request"


class SentryStarliteASGIMiddleware(SentryAsgiMiddleware):
    def __init__(self, app: "ASGIApp"):
        super().__init__(
            app=app,
            unsafe_context_data=False,
            transaction_style="endpoint",
            mechanism_type="asgi",
        )


class StarliteIntegration(Integration):
    identifier = "starlite"

    @staticmethod
    def setup_once() -> None:
        patch_app_init()
        patch_middlewares()
        patch_http_route_handle()


def patch_app_init() -> None:
    """
    Replaces the Starlite class's `__init__` function in order to inject `after_exception` handlers and set the
    `SentryStarliteASGIMiddleware` as the outmost middleware in the stack.
    See:
    - https://starlite-api.github.io/starlite/usage/0-the-starlite-app/5-application-hooks/#after-exception
    - https://starlite-api.github.io/starlite/usage/7-middleware/0-middleware-intro/
    """
    old__init__ = Starlite.__init__

    def injection_wrapper(self: "Starlite", *args: "Any", **kwargs: "Any") -> None:
        after_exception = kwargs.pop("after_exception", [])
        kwargs.update(
            after_exception=[
                exception_handler,
                *(
                    after_exception
                    if isinstance(after_exception, list)
                    else [after_exception]
                ),
            ]
        )

        SentryStarliteASGIMiddleware.__call__ = SentryStarliteASGIMiddleware._run_asgi3
        middleware = kwargs.pop("middleware", None) or []
        kwargs["middleware"] = [SentryStarliteASGIMiddleware, *middleware]
        old__init__(self, *args, **kwargs)

    Starlite.__init__ = injection_wrapper


def patch_middlewares() -> None:
    old__resolve_middleware_stack = BaseRouteHandler.resolve_middleware

    def resolve_middleware_wrapper(self: "Any") -> "List[Middleware]":
        return [
            enable_span_for_middleware(middleware)
            for middleware in old__resolve_middleware_stack(self)
        ]

    BaseRouteHandler.resolve_middleware = resolve_middleware_wrapper


def enable_span_for_middleware(middleware: "Middleware") -> "Middleware":
    if (
        not hasattr(middleware, "__call__")  # noqa: B004
        or middleware is SentryStarliteASGIMiddleware
    ):
        return middleware

    if isinstance(middleware, DefineMiddleware):
        old_call: "ASGIApp" = middleware.middleware.__call__
    else:
        old_call = middleware.__call__

    async def _create_span_call(
        self: "MiddlewareProtocol", scope: "Scope", receive: "Receive", send: "Send"
    ) -> None:
        hub = Hub.current
        integration = hub.get_integration(StarliteIntegration)
        if integration is not None:
            middleware_name = self.__class__.__name__
            with hub.start_span(
                op=OP.MIDDLEWARE_STARLITE, description=middleware_name
            ) as middleware_span:
                middleware_span.set_tag("starlite.middleware_name", middleware_name)

                # Creating spans for the "receive" callback
                async def _sentry_receive(
                    *args: "Any", **kwargs: "Any"
                ) -> "Union[HTTPReceiveMessage, WebSocketReceiveMessage]":
                    hub = Hub.current
                    with hub.start_span(
                        op=OP.MIDDLEWARE_STARLITE_RECEIVE,
                        description=getattr(receive, "__qualname__", str(receive)),
                    ) as span:
                        span.set_tag("starlite.middleware_name", middleware_name)
                        return await receive(*args, **kwargs)

                receive_name = getattr(receive, "__name__", str(receive))
                receive_patched = receive_name == "_sentry_receive"
                new_receive = _sentry_receive if not receive_patched else receive

                # Creating spans for the "send" callback
                async def _sentry_send(message: "Message") -> None:
                    hub = Hub.current
                    with hub.start_span(
                        op=OP.MIDDLEWARE_STARLITE_SEND,
                        description=getattr(send, "__qualname__", str(send)),
                    ) as span:
                        span.set_tag("starlite.middleware_name", middleware_name)
                        return await send(message)

                send_name = getattr(send, "__name__", str(send))
                send_patched = send_name == "_sentry_send"
                new_send = _sentry_send if not send_patched else send

                return await old_call(self, scope, new_receive, new_send)
        else:
            return await old_call(self, scope, receive, send)

    not_yet_patched = old_call.__name__ not in ["_create_span_call"]

    if not_yet_patched:
        if isinstance(middleware, DefineMiddleware):
            middleware.middleware.__call__ = _create_span_call
        else:
            middleware.__call__ = _create_span_call

    return middleware


def patch_http_route_handle() -> None:
    old_handle = HTTPRoute.handle

    async def handle_wrapper(
        self: "HTTPRoute", scope: "HTTPScope", receive: "Receive", send: "Send"
    ) -> None:
        hub = Hub.current
        integration: StarliteIntegration = hub.get_integration(StarliteIntegration)
        if integration is None:
            return await old_handle(self, scope, receive, send)

        with hub.configure_scope() as sentry_scope:
            request: "Request[Any, Any]" = scope["app"].request_class(
                scope=scope, receive=receive, send=send
            )
            extracted_request_data = ConnectionDataExtractor(
                parse_body=True, parse_query=True
            )(request)
            body = extracted_request_data.pop("body")

            request_data = await body

            def event_processor(event: "Event", _: "Dict[str, Any]") -> "Event":
                route_handler = scope.get("route_handler")

                request_info = event.get("request", {})
                request_info["content_length"] = len(scope.get("_body", b""))
                if _should_send_default_pii():
                    request_info["cookies"] = extracted_request_data["cookies"]
                if request_data is not None:
                    request_info["data"] = request_data

                func = None
                if route_handler.name is not None:
                    tx_name = route_handler.name
                elif isinstance(route_handler.fn, Ref):
                    func = route_handler.fn.value
                else:
                    func = route_handler.fn
                if func is not None:
                    tx_name = transaction_from_function(func)

                tx_info = {"source": SOURCE_FOR_STYLE["endpoint"]}

                if not tx_name:
                    tx_name = _DEFAULT_TRANSACTION_NAME
                    tx_info = {"source": TRANSACTION_SOURCE_ROUTE}

                event.update(
                    request=request_info, transaction=tx_name, transaction_info=tx_info
                )
                return event

            sentry_scope._name = StarliteIntegration.identifier
            sentry_scope.add_event_processor(event_processor)

            return await old_handle(self, scope, receive, send)

    HTTPRoute.handle = handle_wrapper


def retrieve_user_from_scope(scope: "Scope") -> "Optional[Dict[str, Any]]":
    scope_user = scope.get("user", {})
    if not scope_user:
        return None
    if isinstance(scope_user, dict):
        return scope_user
    if isinstance(scope_user, BaseModel):
        return scope_user.dict()
    if hasattr(scope_user, "asdict"):  # dataclasses
        return scope_user.asdict()

    plugin = get_plugin_for_value(scope_user)
    if plugin and not is_async_callable(plugin.to_dict):
        return plugin.to_dict(scope_user)

    return None


def exception_handler(exc: Exception, scope: "Scope", _: "State") -> None:
    hub = Hub.current
    if hub.get_integration(StarliteIntegration) is None:
        return

    user_info: "Optional[Dict[str, Any]]" = None
    if _should_send_default_pii():
        user_info = retrieve_user_from_scope(scope)
    if user_info and isinstance(user_info, dict):
        with hub.configure_scope() as sentry_scope:
            sentry_scope.set_user(user_info)

    event, hint = event_from_exception(
        exc,
        client_options=hub.client.options if hub.client else None,
        mechanism={"type": StarliteIntegration.identifier, "handled": False},
    )

    hub.capture_event(event, hint=hint)