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from sentry_sdk import Hub
from sentry_sdk._types import MYPY
from sentry_sdk.consts import OP
from sentry_sdk.integrations import DidNotEnable
from sentry_sdk.tracing import Transaction, TRANSACTION_SOURCE_CUSTOM

if MYPY:
    from typing import Callable, Optional
    from google.protobuf.message import Message  # type: ignore

try:
    import grpc
    from grpc import ServicerContext, HandlerCallDetails, RpcMethodHandler
except ImportError:
    raise DidNotEnable("grpcio is not installed")


class ServerInterceptor(grpc.ServerInterceptor):  # type: ignore
    def __init__(self, find_name=None):
        # type: (ServerInterceptor, Optional[Callable[[ServicerContext], str]]) -> None
        self._find_method_name = find_name or ServerInterceptor._find_name

        super(ServerInterceptor, self).__init__()

    def intercept_service(self, continuation, handler_call_details):
        # type: (ServerInterceptor, Callable[[HandlerCallDetails], RpcMethodHandler], HandlerCallDetails) -> RpcMethodHandler
        handler = continuation(handler_call_details)
        if not handler or not handler.unary_unary:
            return handler

        def behavior(request, context):
            # type: (Message, ServicerContext) -> Message
            hub = Hub(Hub.current)

            name = self._find_method_name(context)

            if name:
                metadata = dict(context.invocation_metadata())

                transaction = Transaction.continue_from_headers(
                    metadata,
                    op=OP.GRPC_SERVER,
                    name=name,
                    source=TRANSACTION_SOURCE_CUSTOM,
                )

                with hub.start_transaction(transaction=transaction):
                    try:
                        return handler.unary_unary(request, context)
                    except BaseException as e:
                        raise e
            else:
                return handler.unary_unary(request, context)

        return grpc.unary_unary_rpc_method_handler(
            behavior,
            request_deserializer=handler.request_deserializer,
            response_serializer=handler.response_serializer,
        )

    @staticmethod
    def _find_name(context):
        # type: (ServicerContext) -> str
        return context._rpc_event.call_details.method.decode()
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