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import sys
import weakref

from sentry_sdk.api import continue_trace
from sentry_sdk._compat import reraise
from sentry_sdk.consts import OP, SPANDATA
from sentry_sdk.hub import Hub
from sentry_sdk.integrations import Integration, DidNotEnable
from sentry_sdk.integrations.logging import ignore_logger
from sentry_sdk.sessions import auto_session_tracking
from sentry_sdk.integrations._wsgi_common import (
    _filter_headers,
    request_body_within_bounds,
)
from sentry_sdk.tracing import (
    BAGGAGE_HEADER_NAME,
    SOURCE_FOR_STYLE,
    TRANSACTION_SOURCE_ROUTE,
)
from sentry_sdk.tracing_utils import should_propagate_trace
from sentry_sdk.utils import (
    capture_internal_exceptions,
    event_from_exception,
    logger,
    parse_url,
    parse_version,
    transaction_from_function,
    HAS_REAL_CONTEXTVARS,
    CONTEXTVARS_ERROR_MESSAGE,
    SENSITIVE_DATA_SUBSTITUTE,
    AnnotatedValue,
)

try:
    import asyncio

    from aiohttp import __version__ as AIOHTTP_VERSION
    from aiohttp import ClientSession, TraceConfig
    from aiohttp.web import Application, HTTPException, UrlDispatcher
except ImportError:
    raise DidNotEnable("AIOHTTP not installed")

from sentry_sdk._types import TYPE_CHECKING

if TYPE_CHECKING:
    from aiohttp.web_request import Request
    from aiohttp.abc import AbstractMatchInfo
    from aiohttp import TraceRequestStartParams, TraceRequestEndParams
    from types import SimpleNamespace
    from typing import Any
    from typing import Dict
    from typing import Optional
    from typing import Tuple
    from typing import Callable
    from typing import Union

    from sentry_sdk.utils import ExcInfo
    from sentry_sdk._types import EventProcessor


TRANSACTION_STYLE_VALUES = ("handler_name", "method_and_path_pattern")


class AioHttpIntegration(Integration):
    identifier = "aiohttp"

    def __init__(self, transaction_style="handler_name"):
        # type: (str) -> None
        if transaction_style not in TRANSACTION_STYLE_VALUES:
            raise ValueError(
                "Invalid value for transaction_style: %s (must be in %s)"
                % (transaction_style, TRANSACTION_STYLE_VALUES)
            )
        self.transaction_style = transaction_style

    @staticmethod
    def setup_once():
        # type: () -> None

        version = parse_version(AIOHTTP_VERSION)

        if version is None:
            raise DidNotEnable("Unparsable AIOHTTP version: {}".format(AIOHTTP_VERSION))

        if version < (3, 4):
            raise DidNotEnable("AIOHTTP 3.4 or newer required.")

        if not HAS_REAL_CONTEXTVARS:
            # We better have contextvars or we're going to leak state between
            # requests.
            raise DidNotEnable(
                "The aiohttp integration for Sentry requires Python 3.7+ "
                " or aiocontextvars package." + CONTEXTVARS_ERROR_MESSAGE
            )

        ignore_logger("aiohttp.server")

        old_handle = Application._handle

        async def sentry_app_handle(self, request, *args, **kwargs):
            # type: (Any, Request, *Any, **Any) -> Any
            hub = Hub.current
            if hub.get_integration(AioHttpIntegration) is None:
                return await old_handle(self, request, *args, **kwargs)

            weak_request = weakref.ref(request)

            with Hub(hub) as hub:
                with auto_session_tracking(hub, session_mode="request"):
                    # Scope data will not leak between requests because aiohttp
                    # create a task to wrap each request.
                    with hub.configure_scope() as scope:
                        scope.clear_breadcrumbs()
                        scope.add_event_processor(_make_request_processor(weak_request))

                    transaction = continue_trace(
                        request.headers,
                        op=OP.HTTP_SERVER,
                        # If this transaction name makes it to the UI, AIOHTTP's
                        # URL resolver did not find a route or died trying.
                        name="generic AIOHTTP request",
                        source=TRANSACTION_SOURCE_ROUTE,
                    )
                    with hub.start_transaction(
                        transaction,
                        custom_sampling_context={"aiohttp_request": request},
                    ):
                        try:
                            response = await old_handle(self, request)
                        except HTTPException as e:
                            transaction.set_http_status(e.status_code)
                            raise
                        except (asyncio.CancelledError, ConnectionResetError):
                            transaction.set_status("cancelled")
                            raise
                        except Exception:
                            # This will probably map to a 500 but seems like we
                            # have no way to tell. Do not set span status.
                            reraise(*_capture_exception(hub))

                        transaction.set_http_status(response.status)
                        return response

        Application._handle = sentry_app_handle

        old_urldispatcher_resolve = UrlDispatcher.resolve

        async def sentry_urldispatcher_resolve(self, request):
            # type: (UrlDispatcher, Request) -> AbstractMatchInfo
            rv = await old_urldispatcher_resolve(self, request)

            hub = Hub.current
            integration = hub.get_integration(AioHttpIntegration)

            name = None

            try:
                if integration.transaction_style == "handler_name":
                    name = transaction_from_function(rv.handler)
                elif integration.transaction_style == "method_and_path_pattern":
                    route_info = rv.get_info()
                    pattern = route_info.get("path") or route_info.get("formatter")
                    name = "{} {}".format(request.method, pattern)
            except Exception:
                pass

            if name is not None:
                with Hub.current.configure_scope() as scope:
                    scope.set_transaction_name(
                        name,
                        source=SOURCE_FOR_STYLE[integration.transaction_style],
                    )

            return rv

        UrlDispatcher.resolve = sentry_urldispatcher_resolve

        old_client_session_init = ClientSession.__init__

        def init(*args, **kwargs):
            # type: (Any, Any) -> ClientSession
            hub = Hub.current
            if hub.get_integration(AioHttpIntegration) is None:
                return old_client_session_init(*args, **kwargs)

            client_trace_configs = list(kwargs.get("trace_configs") or ())
            trace_config = create_trace_config()
            client_trace_configs.append(trace_config)

            kwargs["trace_configs"] = client_trace_configs
            return old_client_session_init(*args, **kwargs)

        ClientSession.__init__ = init


def create_trace_config():
    # type: () -> TraceConfig
    async def on_request_start(session, trace_config_ctx, params):
        # type: (ClientSession, SimpleNamespace, TraceRequestStartParams) -> None
        hub = Hub.current
        if hub.get_integration(AioHttpIntegration) is None:
            return

        method = params.method.upper()

        parsed_url = None
        with capture_internal_exceptions():
            parsed_url = parse_url(str(params.url), sanitize=False)

        span = hub.start_span(
            op=OP.HTTP_CLIENT,
            description="%s %s"
            % (method, parsed_url.url if parsed_url else SENSITIVE_DATA_SUBSTITUTE),
        )
        span.set_data(SPANDATA.HTTP_METHOD, method)
        span.set_data("url", parsed_url.url)
        span.set_data(SPANDATA.HTTP_QUERY, parsed_url.query)
        span.set_data(SPANDATA.HTTP_FRAGMENT, parsed_url.fragment)

        if should_propagate_trace(hub, str(params.url)):
            for key, value in hub.iter_trace_propagation_headers(span):
                logger.debug(
                    "[Tracing] Adding `{key}` header {value} to outgoing request to {url}.".format(
                        key=key, value=value, url=params.url
                    )
                )
                if key == BAGGAGE_HEADER_NAME and params.headers.get(
                    BAGGAGE_HEADER_NAME
                ):
                    # do not overwrite any existing baggage, just append to it
                    params.headers[key] += "," + value
                else:
                    params.headers[key] = value

        trace_config_ctx.span = span

    async def on_request_end(session, trace_config_ctx, params):
        # type: (ClientSession, SimpleNamespace, TraceRequestEndParams) -> None
        if trace_config_ctx.span is None:
            return

        span = trace_config_ctx.span
        span.set_http_status(int(params.response.status))
        span.set_data("reason", params.response.reason)
        span.finish()

    trace_config = TraceConfig()

    trace_config.on_request_start.append(on_request_start)
    trace_config.on_request_end.append(on_request_end)

    return trace_config


def _make_request_processor(weak_request):
    # type: (Callable[[], Request]) -> EventProcessor
    def aiohttp_processor(
        event,  # type: Dict[str, Any]
        hint,  # type: Dict[str, Tuple[type, BaseException, Any]]
    ):
        # type: (...) -> Dict[str, Any]
        request = weak_request()
        if request is None:
            return event

        with capture_internal_exceptions():
            request_info = event.setdefault("request", {})

            request_info["url"] = "%s://%s%s" % (
                request.scheme,
                request.host,
                request.path,
            )

            request_info["query_string"] = request.query_string
            request_info["method"] = request.method
            request_info["env"] = {"REMOTE_ADDR": request.remote}

            hub = Hub.current
            request_info["headers"] = _filter_headers(dict(request.headers))

            # Just attach raw data here if it is within bounds, if available.
            # Unfortunately there's no way to get structured data from aiohttp
            # without awaiting on some coroutine.
            request_info["data"] = get_aiohttp_request_data(hub, request)

        return event

    return aiohttp_processor


def _capture_exception(hub):
    # type: (Hub) -> ExcInfo
    exc_info = sys.exc_info()
    event, hint = event_from_exception(
        exc_info,
        client_options=hub.client.options,  # type: ignore
        mechanism={"type": "aiohttp", "handled": False},
    )
    hub.capture_event(event, hint=hint)
    return exc_info


BODY_NOT_READ_MESSAGE = "[Can't show request body due to implementation details.]"


def get_aiohttp_request_data(hub, request):
    # type: (Hub, Request) -> Union[Optional[str], AnnotatedValue]
    bytes_body = request._read_bytes

    if bytes_body is not None:
        # we have body to show
        if not request_body_within_bounds(hub.client, len(bytes_body)):
            return AnnotatedValue.removed_because_over_size_limit()

        encoding = request.charset or "utf-8"
        return bytes_body.decode(encoding, "replace")

    if request.can_read_body:
        # body exists but we can't show it
        return BODY_NOT_READ_MESSAGE

    # request has no body
    return None