`airflow.providers.google.common.hooks.base_google`¶

This module contains a Google Cloud API base hook.

Module Contents¶

Classes¶

`retry_if_temporary_quota`	Retries if there was an exception for exceeding the temporary quote limit.
`retry_if_operation_in_progress`	Retries if there was an exception for exceeding the temporary quote limit.
`GoogleBaseHook`	A base hook for Google cloud-related hooks. Google cloud has a shared REST

Functions¶

`is_soft_quota_exception`(exception)	API for Google services does not have a standardized way to report quota violation errors.
`is_operation_in_progress_exception`(exception)	Some of the calls return 429 (too many requests!) or 409 errors (Conflict)

Attributes¶

`log`
`INVALID_KEYS`
`INVALID_REASONS`
`PROVIDE_PROJECT_ID`
`T`
`RT`

airflow.providers.google.common.hooks.base_google.log[source]¶

airflow.providers.google.common.hooks.base_google.INVALID_KEYS = ['DefaultRequestsPerMinutePerProject', 'DefaultRequestsPerMinutePerUser',...[source]¶

airflow.providers.google.common.hooks.base_google.INVALID_REASONS = ['userRateLimitExceeded'][source]¶

airflow.providers.google.common.hooks.base_google.is_soft_quota_exception(exception)[source]¶

API for Google services does not have a standardized way to report quota violation errors. The function has been adapted by trial and error to the following services:

Google Translate
Google Vision
Google Text-to-Speech
Google Speech-to-Text
Google Natural Language
Google Video Intelligence

airflow.providers.google.common.hooks.base_google.is_operation_in_progress_exception(exception)[source]¶

Some of the calls return 429 (too many requests!) or 409 errors (Conflict) in case of operation in progress.

Google Cloud SQL

class airflow.providers.google.common.hooks.base_google.retry_if_temporary_quota[source]¶

Bases: tenacity.retry_if_exception

Retries if there was an exception for exceeding the temporary quote limit.

class airflow.providers.google.common.hooks.base_google.retry_if_operation_in_progress[source]¶

Bases: tenacity.retry_if_exception

Retries if there was an exception for exceeding the temporary quote limit.

airflow.providers.google.common.hooks.base_google.PROVIDE_PROJECT_ID :str[source]¶

airflow.providers.google.common.hooks.base_google.T[source]¶

airflow.providers.google.common.hooks.base_google.RT[source]¶

class airflow.providers.google.common.hooks.base_google.GoogleBaseHook(gcp_conn_id='google_cloud_default', delegate_to=None, impersonation_chain=None)[source]¶

Bases: airflow.hooks.base.BaseHook

A base hook for Google cloud-related hooks. Google cloud has a shared REST API client that is built in the same way no matter which service you use. This class helps construct and authorize the credentials needed to then call googleapiclient.discovery.build() to actually discover and build a client for a Google cloud service.

The class also contains some miscellaneous helper functions.

All hook derived from this base hook use the ‘Google Cloud’ connection type. Three ways of authentication are supported:

Default credentials: Only the ‘Project Id’ is required. You’ll need to have set up default credentials, such as by the GOOGLE_APPLICATION_DEFAULT environment variable or from the metadata server on Google Compute Engine.

JSON key file: Specify ‘Project Id’, ‘Keyfile Path’ and ‘Scope’.

Legacy P12 key files are not supported.

JSON data provided in the UI: Specify ‘Keyfile JSON’.

Parameters

gcp_conn_id (str) – The connection ID to use when fetching connection info.
delegate_to (Optional[str]) – The account to impersonate using domain-wide delegation of authority, if any. For this to work, the service account making the request must have domain-wide delegation enabled.
impersonation_chain (Optional[Union[str, Sequence[str]]]) – Optional service account to impersonate using short-term credentials, or chained list of accounts required to get the access_token of the last account in the list, which will be impersonated in the request. If set as a string, the account must grant the originating account the Service Account Token Creator IAM role. If set as a sequence, the identities from the list must grant Service Account Token Creator IAM role to the directly preceding identity, with first account from the list granting this role to the originating account.

conn_name_attr = gcp_conn_id[source]¶

default_conn_name = google_cloud_default[source]¶

conn_type = google_cloud_platform[source]¶

hook_name = Google Cloud[source]¶

static get_connection_form_widgets()[source]¶

Returns connection widgets to add to connection form

static get_ui_field_behaviour()[source]¶

Returns custom field behaviour

property project_id(self)[source]¶

Returns project id.

Returns: id of the project
Return type: str

property num_retries(self)[source]¶

Returns num_retries from Connection.

Returns: the number of times each API request should be retried
Return type: int

property client_info(self)[source]¶

Return client information used to generate a user-agent for API calls.

It allows for better errors tracking.

This object is only used by the google-cloud-* libraries that are built specifically for the Google Cloud. It is not supported by The Google APIs Python Client that use Discovery based APIs.

property scopes(self)[source]¶

Return OAuth 2.0 scopes.

Returns: Returns the scope defined in the connection configuration, or the default scope
Return type: Sequence[str]

static quota_retry(*args, **kwargs)[source]¶

A decorator that provides a mechanism to repeat requests in response to exceeding a temporary quote limit.

static operation_in_progress_retry(*args, **kwargs)[source]¶

A decorator that provides a mechanism to repeat requests in response to operation in progress (HTTP 409) limit.

static fallback_to_default_project_id(func)[source]¶

Decorator that provides fallback for Google Cloud project id. If the project is None it will be replaced with the project_id from the service account the Hook is authenticated with. Project id can be specified either via project_id kwarg or via first parameter in positional args.

Parameters: func (Callable[Ellipsis, RT]) – function to wrap
Returns: result of the function call
Return type: Callable[Ellipsis, RT]

static provide_gcp_credential_file(func)[source]¶

Function decorator that provides a Google Cloud credentials for application supporting Application Default Credentials (ADC) strategy.

It is recommended to use provide_gcp_credential_file_as_context context manager to limit the scope when authorization data is available. Using context manager also makes it easier to use multiple connection in one function.

provide_gcp_credential_file_as_context(self)[source]¶

Context manager that provides a Google Cloud credentials for application supporting Application Default Credentials (ADC) strategy.

It can be used to provide credentials for external programs (e.g. gcloud) that expect authorization file in GOOGLE_APPLICATION_CREDENTIALS environment variable.

provide_authorized_gcloud(self)[source]¶

Provides a separate gcloud configuration with current credentials.

The gcloud tool allows you to login to Google Cloud only - gcloud auth login and for the needs of Application Default Credentials gcloud auth application-default login. In our case, we want all commands to use only the credentials from ADCm so we need to configure the credentials in gcloud manually.

static download_content_from_request(file_handle, request, chunk_size)[source]¶

Download media resources. Note that the Python file object is compatible with io.Base and can be used with this class also.