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editing: falcon.py

from __future__ import absolute_import

from sentry_sdk.hub import Hub
from sentry_sdk.integrations import Integration, DidNotEnable
from sentry_sdk.integrations._wsgi_common import RequestExtractor
from sentry_sdk.integrations.wsgi import SentryWsgiMiddleware
from sentry_sdk.utils import capture_internal_exceptions, event_from_exception

from sentry_sdk._types import MYPY

if MYPY:
    from typing import Any
    from typing import Dict
    from typing import Optional

from sentry_sdk._types import EventProcessor

try:
    import falcon  # type: ignore
    import falcon.api_helpers  # type: ignore

from falcon import __version__ as FALCON_VERSION
except ImportError:
    raise DidNotEnable("Falcon not installed")

class FalconRequestExtractor(RequestExtractor):
    def env(self):
        # type: () -> Dict[str, Any]
        return self.request.env

def cookies(self):
        # type: () -> Dict[str, Any]
        return self.request.cookies

def form(self):
        # type: () -> None
        return None  # No such concept in Falcon

def files(self):
        # type: () -> None
        return None  # No such concept in Falcon

def raw_data(self):
        # type: () -> Optional[str]

# As request data can only be read once we won't make this available
        # to Sentry. Just send back a dummy string in case there was a
        # content length.
        # TODO(jmagnusson): Figure out if there's a way to support this
        content_length = self.content_length()
        if content_length > 0:
            return "[REQUEST_CONTAINING_RAW_DATA]"
        else:
            return None

def json(self):
        # type: () -> Optional[Dict[str, Any]]
        try:
            return self.request.media
        except falcon.errors.HTTPBadRequest:
            # NOTE(jmagnusson): We return `falcon.Request._media` here because
            # falcon 1.4 doesn't do proper type checking in
            # `falcon.Request.media`. This has been fixed in 2.0.
            # Relevant code: https://github.com/falconry/falcon/blob/1.4.1/falcon/request.py#L953
            return self.request._media

class SentryFalconMiddleware(object):
    """Captures exceptions in Falcon requests and send to Sentry"""

def process_request(self, req, resp, *args, **kwargs):
        # type: (Any, Any, *Any, **Any) -> None
        hub = Hub.current
        integration = hub.get_integration(FalconIntegration)
        if integration is None:
            return

with hub.configure_scope() as scope:
            scope._name = "falcon"
            scope.add_event_processor(_make_request_event_processor(req, integration))

TRANSACTION_STYLE_VALUES = ("uri_template", "path")

class FalconIntegration(Integration):
    identifier = "falcon"

transaction_style = None

def __init__(self, transaction_style="uri_template"):
        # 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
        try:
            version = tuple(map(int, FALCON_VERSION.split(".")))
        except (ValueError, TypeError):
            raise DidNotEnable("Unparsable Falcon version: {}".format(FALCON_VERSION))

if version < (1, 4):
            raise DidNotEnable("Falcon 1.4 or newer required.")

_patch_wsgi_app()
        _patch_handle_exception()
        _patch_prepare_middleware()

def _patch_wsgi_app():
    # type: () -> None
    original_wsgi_app = falcon.API.__call__

def sentry_patched_wsgi_app(self, env, start_response):
        # type: (falcon.API, Any, Any) -> Any
        hub = Hub.current
        integration = hub.get_integration(FalconIntegration)
        if integration is None:
            return original_wsgi_app(self, env, start_response)

sentry_wrapped = SentryWsgiMiddleware(
            lambda envi, start_resp: original_wsgi_app(self, envi, start_resp)
        )

return sentry_wrapped(env, start_response)

falcon.API.__call__ = sentry_patched_wsgi_app

def _patch_handle_exception():
    # type: () -> None
    original_handle_exception = falcon.API._handle_exception

def sentry_patched_handle_exception(self, *args):
        # type: (falcon.API, *Any) -> Any
        # NOTE(jmagnusson): falcon 2.0 changed falcon.API._handle_exception
        # method signature from `(ex, req, resp, params)` to
        # `(req, resp, ex, params)`
        if isinstance(args[0], Exception):
            ex = args[0]
        else:
            ex = args[2]

was_handled = original_handle_exception(self, *args)

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

if integration is not None and not _is_falcon_http_error(ex):
            # If an integration is there, a client has to be there.
            client = hub.client  # type: Any

event, hint = event_from_exception(
                ex,
                client_options=client.options,
                mechanism={"type": "falcon", "handled": False},
            )
            hub.capture_event(event, hint=hint)

return was_handled

falcon.API._handle_exception = sentry_patched_handle_exception

def _patch_prepare_middleware():
    # type: () -> None
    original_prepare_middleware = falcon.api_helpers.prepare_middleware

def sentry_patched_prepare_middleware(
        middleware=None, independent_middleware=False
    ):
        # type: (Any, Any) -> Any
        hub = Hub.current
        integration = hub.get_integration(FalconIntegration)
        if integration is not None:
            middleware = [SentryFalconMiddleware()] + (middleware or [])
        return original_prepare_middleware(middleware, independent_middleware)

falcon.api_helpers.prepare_middleware = sentry_patched_prepare_middleware

def _is_falcon_http_error(ex):
    # type: (BaseException) -> bool
    return isinstance(ex, (falcon.HTTPError, falcon.http_status.HTTPStatus))

def _make_request_event_processor(req, integration):
    # type: (falcon.Request, FalconIntegration) -> EventProcessor

def inner(event, hint):
        # type: (Dict[str, Any], Dict[str, Any]) -> Dict[str, Any]
        if integration.transaction_style == "uri_template":
            event["transaction"] = req.uri_template
        elif integration.transaction_style == "path":
            event["transaction"] = req.path

with capture_internal_exceptions():
            FalconRequestExtractor(req).extract_into_event(event)

return event

return inner

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