astronomer.providers.google.cloud.sensors.gcs

This module contains Google Cloud Storage sensors.

Module Contents

Classes

GCSObjectExistenceSensorAsync	Checks for the existence of a file in Google Cloud Storage.
GCSObjectsWithPrefixExistenceSensorAsync	Async Operator that Checks for the existence of GCS objects at a given prefix, passing matches via XCom.
GCSUploadSessionCompleteSensorAsync	Checks for changes in the number of objects at prefix in Google Cloud Storage
GCSObjectUpdateSensorAsync	Async version to check if an object is updated in Google Cloud Storage

class astronomer.providers.google.cloud.sensors.gcs.GCSObjectExistenceSensorAsync(polling_interval=5.0, **kwargs)

Bases: airflow.providers.google.cloud.sensors.gcs.GCSObjectExistenceSensor

Checks for the existence of a file in Google Cloud Storage.

Parameters:

• bucket – The Google Cloud Storage bucket where the object is.

• object – The name of the object to check in the Google cloud storage bucket.

• google_cloud_conn_id – The connection ID to use when connecting to Google Cloud Storage.

• delegate_to – (Removed in apache-airflow-providers-google release 10.0.0, use impersonation_chain instead) 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 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 (templated).

execute(context)

Airflow runs this method on the worker and defers using the trigger.

execute_complete(context, event)

Callback for when the trigger fires - returns immediately. Relies on trigger to throw an exception, otherwise it assumes execution was successful.

class astronomer.providers.google.cloud.sensors.gcs.GCSObjectsWithPrefixExistenceSensorAsync(polling_interval=5.0, **kwargs)

Bases: airflow.providers.google.cloud.sensors.gcs.GCSObjectsWithPrefixExistenceSensor

Async Operator that Checks for the existence of GCS objects at a given prefix, passing matches via XCom.

When files matching the given prefix are found, the poke method’s criteria will be fulfilled and the matching objects will be returned from the operator and passed through XCom for downstream tasks.

Parameters:

• bucket – The Google Cloud Storage bucket where the object is.

• prefix – The name of the prefix to check in the Google cloud storage bucket.

• google_cloud_conn_id – The connection ID to use when connecting to Google Cloud Storage.

• delegate_to – (Removed in apache-airflow-providers-google release 10.0.0, use impersonation_chain instead) 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 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 (templated).

• polling_interval (float) – The interval in seconds to wait between checks for matching objects.

execute(context)

Airflow runs this method on the worker and defers using the trigger.

execute_complete(context, event)

Callback for when the trigger fires - returns immediately. Relies on trigger to throw an exception, otherwise it assumes execution was successful.

class astronomer.providers.google.cloud.sensors.gcs.GCSUploadSessionCompleteSensorAsync(polling_interval=5.0, **kwargs)

Bases: airflow.providers.google.cloud.sensors.gcs.GCSUploadSessionCompleteSensor

Checks for changes in the number of objects at prefix in Google Cloud Storage bucket and returns True if the inactivity period has passed with no increase in the number of objects. Note, this sensor will no behave correctly in reschedule mode, as the state of the listed objects in the GCS bucket will be lost between rescheduled invocations.

Parameters:

• bucket – The Google Cloud Storage bucket where the objects are expected.

• prefix – The name of the prefix to check in the Google cloud storage bucket.

• inactivity_period – The total seconds of inactivity to designate an upload session is over. Note, this mechanism is not real time and this operator may not return until a poke_interval after this period has passed with no additional objects sensed.

• min_objects – The minimum number of objects needed for upload session to be considered valid.

• previous_objects – The set of object ids found during the last poke.

• allow_delete – Should this sensor consider objects being deleted between pokes valid behavior. If true a warning message will be logged when this happens. If false an error will be raised.

• google_cloud_conn_id – The connection ID to use when connecting to Google Cloud Storage.

• delegate_to – (Removed in apache-airflow-providers-google release 10.0.0, use impersonation_chain instead) 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 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 (templated).

• polling_interval (float) – The interval in seconds to wait between checks for matching objects.

execute(context)

Airflow runs this method on the worker and defers using the trigger.

execute_complete(context, event=None)

Callback for when the trigger fires - returns immediately. Relies on trigger to throw an exception, otherwise it assumes execution was successful.

class astronomer.providers.google.cloud.sensors.gcs.GCSObjectUpdateSensorAsync(polling_interval=5, **kwargs)

Bases: airflow.providers.google.cloud.sensors.gcs.GCSObjectUpdateSensor

Async version to check if an object is updated in Google Cloud Storage

Parameters:

• bucket – The Google Cloud Storage bucket where the object is.

• object – The name of the object to download in the Google cloud storage bucket.

• ts_func – Callback for defining the update condition. The default callback returns execution_date + schedule_interval. The callback takes the context as parameter.

• google_cloud_conn_id – The connection ID to use when connecting to Google Cloud Storage.

• delegate_to – (Removed in apache-airflow-providers-google release 10.0.0, use impersonation_chain instead) 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 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 (templated).

execute(context)

Airflow runs this method on the worker and defers using the trigger.

execute_complete(context, event=None)

Callback for when the trigger fires - returns immediately. Relies on trigger to throw an exception, otherwise it assumes execution was successful.