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import sys
import types
from functools import wraps

import sentry_sdk
from sentry_sdk.integrations import Integration
from sentry_sdk.integrations.logging import ignore_logger
from sentry_sdk.utils import (
    capture_internal_exceptions,
    ensure_integration_enabled,
    event_from_exception,
    reraise,
)

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from typing import Any
    from typing import Iterator
    from typing import TypeVar
    from typing import Callable

    from sentry_sdk._types import ExcInfo

    T = TypeVar("T")
    F = TypeVar("F", bound=Callable[..., Any])


WRAPPED_FUNC = "_wrapped_{}_"
INSPECT_FUNC = "_inspect_{}"  # Required format per apache_beam/transforms/core.py
USED_FUNC = "_sentry_used_"


class BeamIntegration(Integration):
    identifier = "beam"

    @staticmethod
    def setup_once():
        # type: () -> None
        from apache_beam.transforms.core import DoFn, ParDo  # type: ignore

        ignore_logger("root")
        ignore_logger("bundle_processor.create")

        function_patches = ["process", "start_bundle", "finish_bundle", "setup"]
        for func_name in function_patches:
            setattr(
                DoFn,
                INSPECT_FUNC.format(func_name),
                _wrap_inspect_call(DoFn, func_name),
            )

        old_init = ParDo.__init__

        def sentry_init_pardo(self, fn, *args, **kwargs):
            # type: (ParDo, Any, *Any, **Any) -> Any
            # Do not monkey patch init twice
            if not getattr(self, "_sentry_is_patched", False):
                for func_name in function_patches:
                    if not hasattr(fn, func_name):
                        continue
                    wrapped_func = WRAPPED_FUNC.format(func_name)

                    # Check to see if inspect is set and process is not
                    # to avoid monkey patching process twice.
                    # Check to see if function is part of object for
                    # backwards compatibility.
                    process_func = getattr(fn, func_name)
                    inspect_func = getattr(fn, INSPECT_FUNC.format(func_name))
                    if not getattr(inspect_func, USED_FUNC, False) and not getattr(
                        process_func, USED_FUNC, False
                    ):
                        setattr(fn, wrapped_func, process_func)
                        setattr(fn, func_name, _wrap_task_call(process_func))

                self._sentry_is_patched = True
            old_init(self, fn, *args, **kwargs)

        ParDo.__init__ = sentry_init_pardo


def _wrap_inspect_call(cls, func_name):
    # type: (Any, Any) -> Any

    if not hasattr(cls, func_name):
        return None

    def _inspect(self):
        # type: (Any) -> Any
        """
        Inspect function overrides the way Beam gets argspec.
        """
        wrapped_func = WRAPPED_FUNC.format(func_name)
        if hasattr(self, wrapped_func):
            process_func = getattr(self, wrapped_func)
        else:
            process_func = getattr(self, func_name)
            setattr(self, func_name, _wrap_task_call(process_func))
            setattr(self, wrapped_func, process_func)

        # getfullargspec is deprecated in more recent beam versions and get_function_args_defaults
        # (which uses Signatures internally) should be used instead.
        try:
            from apache_beam.transforms.core import get_function_args_defaults

            return get_function_args_defaults(process_func)
        except ImportError:
            from apache_beam.typehints.decorators import getfullargspec  # type: ignore

            return getfullargspec(process_func)

    setattr(_inspect, USED_FUNC, True)
    return _inspect


def _wrap_task_call(func):
    # type: (F) -> F
    """
    Wrap task call with a try catch to get exceptions.
    """

    @wraps(func)
    def _inner(*args, **kwargs):
        # type: (*Any, **Any) -> Any
        try:
            gen = func(*args, **kwargs)
        except Exception:
            raise_exception()

        if not isinstance(gen, types.GeneratorType):
            return gen
        return _wrap_generator_call(gen)

    setattr(_inner, USED_FUNC, True)
    return _inner  # type: ignore


@ensure_integration_enabled(BeamIntegration)
def _capture_exception(exc_info):
    # type: (ExcInfo) -> None
    """
    Send Beam exception to Sentry.
    """
    client = sentry_sdk.get_client()

    event, hint = event_from_exception(
        exc_info,
        client_options=client.options,
        mechanism={"type": "beam", "handled": False},
    )
    sentry_sdk.capture_event(event, hint=hint)


def raise_exception():
    # type: () -> None
    """
    Raise an exception.
    """
    exc_info = sys.exc_info()
    with capture_internal_exceptions():
        _capture_exception(exc_info)
    reraise(*exc_info)


def _wrap_generator_call(gen):
    # type: (Iterator[T]) -> Iterator[T]
    """
    Wrap the generator to handle any failures.
    """
    while True:
        try:
            yield next(gen)
        except StopIteration:
            break
        except Exception:
            raise_exception()