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"""This module contains Google BigQuery sensors."""
from __future__ import annotations
import warnings
from datetime import timedelta
from typing import TYPE_CHECKING, Any, Sequence
from airflow.configuration import conf
from airflow.exceptions import AirflowException, AirflowProviderDeprecationWarning, AirflowSkipException
from airflow.providers.google.cloud.hooks.bigquery import BigQueryHook
from airflow.providers.google.cloud.triggers.bigquery import (
BigQueryTableExistenceTrigger,
BigQueryTablePartitionExistenceTrigger,
)
from airflow.sensors.base import BaseSensorOperator
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class BigQueryTableExistenceSensor(BaseSensorOperator):
"""
Checks for the existence of a table in Google Bigquery.
:param project_id: The Google cloud project in which to look for the table.
The connection supplied to the hook must provide
access to the specified project.
:param dataset_id: The name of the dataset in which to look for the table.
storage bucket.
:param table_id: The name of the table to check the existence of.
:param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud.
: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",
"dataset_id",
"table_id",
"impersonation_chain",
)
def __init__(
self,
*,
project_id: str,
dataset_id: str,
table_id: str,
gcp_conn_id: str = "google_cloud_default",
impersonation_chain: str | Sequence[str] | None = None,
deferrable: bool = conf.getboolean("operators", "default_deferrable", fallback=False),
**kwargs,
) -> None:
if deferrable and "poke_interval" not in kwargs:
# TODO: Remove once deprecated
if "polling_interval" in kwargs:
kwargs["poke_interval"] = kwargs["polling_interval"]
warnings.warn(
"Argument `poll_interval` is deprecated and will be removed "
"in a future release. Please use `poke_interval` instead.",
AirflowProviderDeprecationWarning,
stacklevel=2,
)
else:
kwargs["poke_interval"] = 5
super().__init__(**kwargs)
self.project_id = project_id
self.dataset_id = dataset_id
self.table_id = table_id
self.gcp_conn_id = gcp_conn_id
self.impersonation_chain = impersonation_chain
self.deferrable = deferrable
[docs] def poke(self, context: Context) -> bool:
table_uri = f"{self.project_id}:{self.dataset_id}.{self.table_id}"
self.log.info("Sensor checks existence of table: %s", table_uri)
hook = BigQueryHook(
gcp_conn_id=self.gcp_conn_id,
impersonation_chain=self.impersonation_chain,
)
return hook.table_exists(
project_id=self.project_id, dataset_id=self.dataset_id, table_id=self.table_id
)
[docs] def execute(self, context: Context) -> None:
"""Airflow runs this method on the worker and defers using the trigger."""
if not self.deferrable:
super().execute(context)
else:
if not self.poke(context=context):
self.defer(
timeout=timedelta(seconds=self.timeout),
trigger=BigQueryTableExistenceTrigger(
dataset_id=self.dataset_id,
table_id=self.table_id,
project_id=self.project_id,
poll_interval=self.poke_interval,
gcp_conn_id=self.gcp_conn_id,
hook_params={
"impersonation_chain": self.impersonation_chain,
},
),
method_name="execute_complete",
)
[docs] def execute_complete(self, context: dict[str, Any], event: dict[str, str] | None = None) -> str:
"""
Callback for when the trigger fires - returns immediately.
Relies on trigger to throw an exception, otherwise it assumes execution was successful.
"""
table_uri = f"{self.project_id}:{self.dataset_id}.{self.table_id}"
self.log.info("Sensor checks existence of table: %s", table_uri)
if event:
if event["status"] == "success":
return event["message"]
# TODO: remove this if check when min_airflow_version is set to higher than 2.7.1
if self.soft_fail:
raise AirflowSkipException(event["message"])
raise AirflowException(event["message"])
# TODO: remove this if check when min_airflow_version is set to higher than 2.7.1
message = "No event received in trigger callback"
if self.soft_fail:
raise AirflowSkipException(message)
raise AirflowException(message)
[docs]class BigQueryTablePartitionExistenceSensor(BaseSensorOperator):
"""
Checks for the existence of a partition within a table in Google Bigquery.
:param project_id: The Google cloud project in which to look for the table.
The connection supplied to the hook must provide
access to the specified project.
:param dataset_id: The name of the dataset in which to look for the table.
storage bucket.
:param table_id: The name of the table to check the existence of.
:param partition_id: The name of the partition to check the existence of.
:param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud.
: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",
"dataset_id",
"table_id",
"partition_id",
"impersonation_chain",
)
def __init__(
self,
*,
project_id: str,
dataset_id: str,
table_id: str,
partition_id: str,
gcp_conn_id: str = "google_cloud_default",
impersonation_chain: str | Sequence[str] | None = None,
deferrable: bool = conf.getboolean("operators", "default_deferrable", fallback=False),
**kwargs,
) -> None:
if deferrable and "poke_interval" not in kwargs:
kwargs["poke_interval"] = 5
super().__init__(**kwargs)
self.project_id = project_id
self.dataset_id = dataset_id
self.table_id = table_id
self.partition_id = partition_id
self.gcp_conn_id = gcp_conn_id
self.impersonation_chain = impersonation_chain
self.deferrable = deferrable
[docs] def poke(self, context: Context) -> bool:
table_uri = f"{self.project_id}:{self.dataset_id}.{self.table_id}"
self.log.info('Sensor checks existence of partition: "%s" in table: %s', self.partition_id, table_uri)
hook = BigQueryHook(
gcp_conn_id=self.gcp_conn_id,
impersonation_chain=self.impersonation_chain,
)
return hook.table_partition_exists(
project_id=self.project_id,
dataset_id=self.dataset_id,
table_id=self.table_id,
partition_id=self.partition_id,
)
[docs] def execute(self, context: Context) -> None:
"""Airflow runs this method on the worker and defers using the triggers if deferrable is True."""
if not self.deferrable:
super().execute(context)
else:
if not self.poke(context=context):
self.defer(
timeout=timedelta(seconds=self.timeout),
trigger=BigQueryTablePartitionExistenceTrigger(
dataset_id=self.dataset_id,
table_id=self.table_id,
project_id=self.project_id,
partition_id=self.partition_id,
poll_interval=self.poke_interval,
gcp_conn_id=self.gcp_conn_id,
hook_params={
"impersonation_chain": self.impersonation_chain,
},
),
method_name="execute_complete",
)
[docs] def execute_complete(self, context: dict[str, Any], event: dict[str, str] | None = None) -> str:
"""
Callback for when the trigger fires - returns immediately.
Relies on trigger to throw an exception, otherwise it assumes execution was successful.
"""
table_uri = f"{self.project_id}:{self.dataset_id}.{self.table_id}"
self.log.info('Sensor checks existence of partition: "%s" in table: %s', self.partition_id, table_uri)
if event:
if event["status"] == "success":
return event["message"]
# TODO: remove this if check when min_airflow_version is set to higher than 2.7.1
if self.soft_fail:
raise AirflowSkipException(event["message"])
raise AirflowException(event["message"])
# TODO: remove this if check when min_airflow_version is set to higher than 2.7.1
message = "No event received in trigger callback"
if self.soft_fail:
raise AirflowSkipException(message)
raise AirflowException(message)
[docs]class BigQueryTableExistenceAsyncSensor(BigQueryTableExistenceSensor):
"""
Checks for the existence of a table in Google Big Query.
This class is deprecated and will be removed in a future release.
Please use :class:`airflow.providers.google.cloud.sensors.bigquery.BigQueryTableExistenceSensor`
and set *deferrable* attribute to *True* instead.
:param project_id: The Google cloud project in which to look for the table.
The connection supplied to the hook must provide
access to the specified project.
:param dataset_id: The name of the dataset in which to look for the table.
storage bucket.
:param table_id: The name of the table to check the existence of.
:param gcp_conn_id: The connection ID used to connect to Google Cloud.
:param bigquery_conn_id: (Deprecated) The connection ID used to connect to Google Cloud.
This parameter has been deprecated. You should pass the gcp_conn_id parameter instead.
: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).
:param polling_interval: The interval in seconds to wait between checks table existence.
"""
def __init__(self, **kwargs):
warnings.warn(
"Class `BigQueryTableExistenceAsyncSensor` is deprecated and "
"will be removed in a future release. "
"Please use `BigQueryTableExistenceSensor` and "
"set `deferrable` attribute to `True` instead",
AirflowProviderDeprecationWarning,
)
super().__init__(deferrable=True, **kwargs)
[docs]class BigQueryTableExistencePartitionAsyncSensor(BigQueryTablePartitionExistenceSensor):
"""
Checks for the existence of a partition within a table in Google BigQuery.
This class is deprecated and will be removed in a future release.
Please use :class:`airflow.providers.google.cloud.sensors.bigquery.BigQueryTablePartitionExistenceSensor`
and set *deferrable* attribute to *True* instead.
:param project_id: The Google cloud project in which to look for the table.
The connection supplied to the hook must provide
access to the specified project.
:param dataset_id: The name of the dataset in which to look for the table.
storage bucket.
:param partition_id: The name of the partition to check the existence of.
:param table_id: The name of the table to check the existence of.
:param gcp_conn_id: The connection ID used to connect to Google Cloud.
:param bigquery_conn_id: (Deprecated) The connection ID used to connect to Google Cloud.
This parameter has been deprecated. You should pass the gcp_conn_id parameter instead.
: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).
:param poke_interval: The interval in seconds to wait between checks table existence.
"""
def __init__(self, **kwargs):
warnings.warn(
"Class `BigQueryTableExistencePartitionAsyncSensor` is deprecated and "
"will be removed in a future release. "
"Please use `BigQueryTablePartitionExistenceSensor` and "
"set `deferrable` attribute to `True` instead",
AirflowProviderDeprecationWarning,
)
super().__init__(deferrable=True, **kwargs)
