342 lines
13 KiB
Python
342 lines
13 KiB
Python
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Internal utilities common to all modules."""
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import io
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import json
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import socket
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import googleapiclient
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import httplib2
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import requests
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import firebase_admin
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from firebase_admin import exceptions
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_ERROR_CODE_TO_EXCEPTION_TYPE = {
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exceptions.INVALID_ARGUMENT: exceptions.InvalidArgumentError,
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exceptions.FAILED_PRECONDITION: exceptions.FailedPreconditionError,
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exceptions.OUT_OF_RANGE: exceptions.OutOfRangeError,
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exceptions.UNAUTHENTICATED: exceptions.UnauthenticatedError,
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exceptions.PERMISSION_DENIED: exceptions.PermissionDeniedError,
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exceptions.NOT_FOUND: exceptions.NotFoundError,
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exceptions.ABORTED: exceptions.AbortedError,
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exceptions.ALREADY_EXISTS: exceptions.AlreadyExistsError,
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exceptions.CONFLICT: exceptions.ConflictError,
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exceptions.RESOURCE_EXHAUSTED: exceptions.ResourceExhaustedError,
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exceptions.CANCELLED: exceptions.CancelledError,
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exceptions.DATA_LOSS: exceptions.DataLossError,
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exceptions.UNKNOWN: exceptions.UnknownError,
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exceptions.INTERNAL: exceptions.InternalError,
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exceptions.UNAVAILABLE: exceptions.UnavailableError,
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exceptions.DEADLINE_EXCEEDED: exceptions.DeadlineExceededError,
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}
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_HTTP_STATUS_TO_ERROR_CODE = {
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400: exceptions.INVALID_ARGUMENT,
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401: exceptions.UNAUTHENTICATED,
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403: exceptions.PERMISSION_DENIED,
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404: exceptions.NOT_FOUND,
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409: exceptions.CONFLICT,
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412: exceptions.FAILED_PRECONDITION,
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429: exceptions.RESOURCE_EXHAUSTED,
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500: exceptions.INTERNAL,
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503: exceptions.UNAVAILABLE,
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}
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# See https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
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_RPC_CODE_TO_ERROR_CODE = {
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1: exceptions.CANCELLED,
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2: exceptions.UNKNOWN,
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3: exceptions.INVALID_ARGUMENT,
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4: exceptions.DEADLINE_EXCEEDED,
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5: exceptions.NOT_FOUND,
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6: exceptions.ALREADY_EXISTS,
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7: exceptions.PERMISSION_DENIED,
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8: exceptions.RESOURCE_EXHAUSTED,
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9: exceptions.FAILED_PRECONDITION,
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10: exceptions.ABORTED,
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11: exceptions.OUT_OF_RANGE,
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13: exceptions.INTERNAL,
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14: exceptions.UNAVAILABLE,
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15: exceptions.DATA_LOSS,
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16: exceptions.UNAUTHENTICATED,
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}
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def _get_initialized_app(app):
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"""Returns a reference to an initialized App instance."""
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if app is None:
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return firebase_admin.get_app()
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if isinstance(app, firebase_admin.App):
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initialized_app = firebase_admin.get_app(app.name)
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if app is not initialized_app:
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raise ValueError('Illegal app argument. App instance not '
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'initialized via the firebase module.')
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return app
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raise ValueError('Illegal app argument. Argument must be of type '
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' firebase_admin.App, but given "{0}".'.format(type(app)))
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def get_app_service(app, name, initializer):
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app = _get_initialized_app(app)
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return app._get_service(name, initializer) # pylint: disable=protected-access
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def handle_platform_error_from_requests(error, handle_func=None):
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"""Constructs a ``FirebaseError`` from the given requests error.
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This can be used to handle errors returned by Google Cloud Platform (GCP) APIs.
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Args:
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error: An error raised by the requests module while making an HTTP call to a GCP API.
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handle_func: A function that can be used to handle platform errors in a custom way. When
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specified, this function will be called with three arguments. It has the same
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signature as ```_handle_func_requests``, but may return ``None``.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code.
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"""
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if error.response is None:
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return handle_requests_error(error)
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response = error.response
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content = response.content.decode()
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status_code = response.status_code
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error_dict, message = _parse_platform_error(content, status_code)
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exc = None
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if handle_func:
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exc = handle_func(error, message, error_dict)
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return exc if exc else _handle_func_requests(error, message, error_dict)
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def handle_operation_error(error):
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"""Constructs a ``FirebaseError`` from the given operation error.
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Args:
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error: An error returned by a long running operation.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code.
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"""
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if not isinstance(error, dict):
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return exceptions.UnknownError(
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message='Unknown error while making a remote service call: {0}'.format(error),
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cause=error)
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rpc_code = error.get('code')
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message = error.get('message')
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error_code = _rpc_code_to_error_code(rpc_code)
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err_type = _error_code_to_exception_type(error_code)
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return err_type(message=message)
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def _handle_func_requests(error, message, error_dict):
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"""Constructs a ``FirebaseError`` from the given GCP error.
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Args:
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error: An error raised by the requests module while making an HTTP call.
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message: A message to be included in the resulting ``FirebaseError``.
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error_dict: Parsed GCP error response.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code or None.
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"""
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code = error_dict.get('status')
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return handle_requests_error(error, message, code)
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def handle_requests_error(error, message=None, code=None):
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"""Constructs a ``FirebaseError`` from the given requests error.
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This method is agnostic of the remote service that produced the error, whether it is a GCP
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service or otherwise. Therefore, this method does not attempt to parse the error response in
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any way.
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Args:
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error: An error raised by the requests module while making an HTTP call.
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message: A message to be included in the resulting ``FirebaseError`` (optional). If not
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specified the string representation of the ``error`` argument is used as the message.
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code: A GCP error code that will be used to determine the resulting error type (optional).
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If not specified the HTTP status code on the error response is used to determine a
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suitable error code.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code.
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"""
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if isinstance(error, requests.exceptions.Timeout):
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return exceptions.DeadlineExceededError(
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message='Timed out while making an API call: {0}'.format(error),
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cause=error)
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if isinstance(error, requests.exceptions.ConnectionError):
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return exceptions.UnavailableError(
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message='Failed to establish a connection: {0}'.format(error),
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cause=error)
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if error.response is None:
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return exceptions.UnknownError(
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message='Unknown error while making a remote service call: {0}'.format(error),
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cause=error)
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if not code:
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code = _http_status_to_error_code(error.response.status_code)
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if not message:
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message = str(error)
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err_type = _error_code_to_exception_type(code)
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return err_type(message=message, cause=error, http_response=error.response)
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def handle_platform_error_from_googleapiclient(error, handle_func=None):
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"""Constructs a ``FirebaseError`` from the given googleapiclient error.
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This can be used to handle errors returned by Google Cloud Platform (GCP) APIs.
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Args:
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error: An error raised by the googleapiclient while making an HTTP call to a GCP API.
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handle_func: A function that can be used to handle platform errors in a custom way. When
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specified, this function will be called with three arguments. It has the same
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signature as ```_handle_func_googleapiclient``, but may return ``None``.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code.
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"""
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if not isinstance(error, googleapiclient.errors.HttpError):
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return handle_googleapiclient_error(error)
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content = error.content.decode()
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status_code = error.resp.status
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error_dict, message = _parse_platform_error(content, status_code)
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http_response = _http_response_from_googleapiclient_error(error)
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exc = None
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if handle_func:
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exc = handle_func(error, message, error_dict, http_response)
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return exc if exc else _handle_func_googleapiclient(error, message, error_dict, http_response)
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def _handle_func_googleapiclient(error, message, error_dict, http_response):
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"""Constructs a ``FirebaseError`` from the given GCP error.
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Args:
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error: An error raised by the googleapiclient module while making an HTTP call.
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message: A message to be included in the resulting ``FirebaseError``.
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error_dict: Parsed GCP error response.
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http_response: A requests HTTP response object to associate with the exception.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code or None.
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"""
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code = error_dict.get('status')
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return handle_googleapiclient_error(error, message, code, http_response)
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def handle_googleapiclient_error(error, message=None, code=None, http_response=None):
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"""Constructs a ``FirebaseError`` from the given googleapiclient error.
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This method is agnostic of the remote service that produced the error, whether it is a GCP
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service or otherwise. Therefore, this method does not attempt to parse the error response in
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any way.
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Args:
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error: An error raised by the googleapiclient module while making an HTTP call.
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message: A message to be included in the resulting ``FirebaseError`` (optional). If not
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specified the string representation of the ``error`` argument is used as the message.
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code: A GCP error code that will be used to determine the resulting error type (optional).
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If not specified the HTTP status code on the error response is used to determine a
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suitable error code.
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http_response: A requests HTTP response object to associate with the exception (optional).
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If not specified, one will be created from the ``error``.
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Returns:
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FirebaseError: A ``FirebaseError`` that can be raised to the user code.
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"""
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if isinstance(error, socket.timeout) or (
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isinstance(error, socket.error) and 'timed out' in str(error)):
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return exceptions.DeadlineExceededError(
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message='Timed out while making an API call: {0}'.format(error),
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cause=error)
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if isinstance(error, httplib2.ServerNotFoundError):
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return exceptions.UnavailableError(
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message='Failed to establish a connection: {0}'.format(error),
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cause=error)
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if not isinstance(error, googleapiclient.errors.HttpError):
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return exceptions.UnknownError(
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message='Unknown error while making a remote service call: {0}'.format(error),
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cause=error)
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if not code:
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code = _http_status_to_error_code(error.resp.status)
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if not message:
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message = str(error)
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if not http_response:
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http_response = _http_response_from_googleapiclient_error(error)
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err_type = _error_code_to_exception_type(code)
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return err_type(message=message, cause=error, http_response=http_response)
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def _http_response_from_googleapiclient_error(error):
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"""Creates a requests HTTP Response object from the given googleapiclient error."""
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resp = requests.models.Response()
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resp.raw = io.BytesIO(error.content)
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resp.status_code = error.resp.status
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return resp
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def _http_status_to_error_code(status):
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"""Maps an HTTP status to a platform error code."""
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return _HTTP_STATUS_TO_ERROR_CODE.get(status, exceptions.UNKNOWN)
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def _rpc_code_to_error_code(rpc_code):
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"""Maps an RPC code to a platform error code."""
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return _RPC_CODE_TO_ERROR_CODE.get(rpc_code, exceptions.UNKNOWN)
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def _error_code_to_exception_type(code):
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"""Maps a platform error code to an exception type."""
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return _ERROR_CODE_TO_EXCEPTION_TYPE.get(code, exceptions.UnknownError)
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def _parse_platform_error(content, status_code):
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"""Parses an HTTP error response from a Google Cloud Platform API and extracts the error code
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and message fields.
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Args:
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content: Decoded content of the response body.
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status_code: HTTP status code.
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Returns:
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tuple: A tuple containing error code and message.
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"""
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data = {}
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try:
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parsed_body = json.loads(content)
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if isinstance(parsed_body, dict):
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data = parsed_body
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except ValueError:
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pass
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error_dict = data.get('error', {})
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msg = error_dict.get('message')
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if not msg:
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msg = 'Unexpected HTTP response with status: {0}; body: {1}'.format(status_code, content)
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return error_dict, msg
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