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+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Global Error Handler
+
+This module provides a global error handler and an interface that allows
+error handlers to be registered with the global error handler via entry points.
+A default error handler is also provided.
+
+To use this feature, users can create an error handler that is registered
+using the ``opentelemetry_error_handler`` entry point. A class is to be
+registered in this entry point, this class must inherit from the
+``opentelemetry.sdk.error_handler.ErrorHandler`` class and implement the
+corresponding ``handle`` method. This method will receive the exception object
+that is to be handled. The error handler class should also inherit from the
+exception classes it wants to handle. For example, this would be an error
+handler that handles ``ZeroDivisionError``:
+
+.. code:: python
+
+ from opentelemetry.sdk.error_handler import ErrorHandler
+ from logging import getLogger
+
+ logger = getLogger(__name__)
+
+
+ class ErrorHandler0(ErrorHandler, ZeroDivisionError):
+
+ def _handle(self, error: Exception, *args, **kwargs):
+
+ logger.exception("ErrorHandler0 handling a ZeroDivisionError")
+
+To use the global error handler, just instantiate it as a context manager where
+you want exceptions to be handled:
+
+
+.. code:: python
+
+ from opentelemetry.sdk.error_handler import GlobalErrorHandler
+
+ with GlobalErrorHandler():
+ 1 / 0
+
+If the class of the exception raised in the scope of the ``GlobalErrorHandler``
+object is not parent of any registered error handler, then the default error
+handler will handle the exception. This default error handler will only log the
+exception to standard logging, the exception won't be raised any further.
+"""
+
+from abc import ABC, abstractmethod
+from logging import getLogger
+
+from opentelemetry.util._importlib_metadata import entry_points
+
+logger = getLogger(__name__)
+
+
+class ErrorHandler(ABC):
+ @abstractmethod
+ def _handle(self, error: Exception, *args, **kwargs):
+ """
+ Handle an exception
+ """
+
+
+class _DefaultErrorHandler(ErrorHandler):
+ """
+ Default error handler
+
+ This error handler just logs the exception using standard logging.
+ """
+
+ # pylint: disable=useless-return
+ def _handle(self, error: Exception, *args, **kwargs):
+ logger.exception("Error handled by default error handler: ")
+ return None
+
+
+class GlobalErrorHandler:
+ """
+ Global error handler
+
+ This is a singleton class that can be instantiated anywhere to get the
+ global error handler. This object provides a handle method that receives
+ an exception object that will be handled by the registered error handlers.
+ """
+
+ _instance = None
+
+ def __new__(cls) -> "GlobalErrorHandler":
+ if cls._instance is None:
+ cls._instance = super().__new__(cls)
+
+ return cls._instance
+
+ def __enter__(self):
+ pass
+
+ # pylint: disable=no-self-use
+ def __exit__(self, exc_type, exc_value, traceback):
+ if exc_value is None:
+ return None
+
+ plugin_handled = False
+
+ error_handler_entry_points = entry_points(
+ group="opentelemetry_error_handler"
+ )
+
+ for error_handler_entry_point in error_handler_entry_points:
+ error_handler_class = error_handler_entry_point.load()
+
+ if issubclass(error_handler_class, exc_value.__class__):
+ try:
+ error_handler_class()._handle(exc_value)
+ plugin_handled = True
+
+ # pylint: disable=broad-exception-caught
+ except Exception as error_handling_error:
+ logger.exception(
+ "%s error while handling error"
+ " %s by error handler %s",
+ error_handling_error.__class__.__name__,
+ exc_value.__class__.__name__,
+ error_handler_class.__name__,
+ )
+
+ if not plugin_handled:
+ _DefaultErrorHandler()._handle(exc_value)
+
+ return True