Source code for airflow.providers.google.cloud.sensors.tasks
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"""This module contains a Google Cloud Task sensor."""
from __future__ import annotations
from typing import TYPE_CHECKING, Sequence
from airflow.providers.google.cloud.hooks.tasks import CloudTasksHook
from airflow.sensors.base import BaseSensorOperator
from airflow.utils.context import Context
Pulls tasks count from a cloud task queue.
Always waits for queue returning tasks count as 0.
:param project_id: the Google Cloud project ID for the subscription (templated)
:param gcp_conn_id: The connection ID to use connecting to Google Cloud.
:param queue_name: The queue name to for which task empty sensing is required.
:param 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).
[docs] template_fields: Sequence[str] = (
project_id: str | None = None,
queue_name: str | None = None,
gcp_conn_id: str = "google_cloud_default",
impersonation_chain: str | Sequence[str] | None = None,
) -> None:
self.location = location
self.project_id = project_id
self.queue_name = queue_name
self.gcp_conn_id = gcp_conn_id
self.impersonation_chain = impersonation_chain
[docs] def poke(self, context: Context) -> bool:
hook = CloudTasksHook(
# TODO uncomment page_size once https://issuetracker.google.com/issues/155978649?pli=1 gets fixed
tasks = hook.list_tasks(
self.log.info("tasks exhausted in cloud task queue?: %s" % (len(tasks) == 0))
return len(tasks) == 0