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"""This module contains Google DataFusion hook."""
from __future__ import annotations
import asyncio
import json
import os
import time
from collections.abc import Sequence
from typing import Any
from urllib.parse import quote, urlencode, urljoin
import google.auth
from aiohttp import ClientSession
from gcloud.aio.auth import AioSession, Token
from google.api_core.retry import exponential_sleep_generator
from googleapiclient.discovery import Resource, build
from airflow.exceptions import AirflowException, AirflowNotFoundException
from airflow.providers.google.cloud.utils.datafusion import DataFusionPipelineType
from airflow.providers.google.common.hooks.base_google import (
PROVIDE_PROJECT_ID,
GoogleBaseAsyncHook,
GoogleBaseHook,
)
[docs]Operation = dict[str, Any]
[docs]class ConflictException(AirflowException):
"""Exception to catch 409 error."""
pass
[docs]class PipelineStates:
"""Data Fusion pipeline states."""
[docs] SUSPENDED = "SUSPENDED"
[docs] COMPLETED = "COMPLETED"
[docs]FAILURE_STATES = [PipelineStates.FAILED, PipelineStates.KILLED, PipelineStates.REJECTED]
[docs]SUCCESS_STATES = [PipelineStates.COMPLETED]
[docs]class DataFusionHook(GoogleBaseHook):
"""Hook for Google DataFusion."""
_conn: Resource | None = None
def __init__(
self,
api_version: str = "v1beta1",
gcp_conn_id: str = "google_cloud_default",
impersonation_chain: str | Sequence[str] | None = None,
**kwargs,
) -> None:
super().__init__(
gcp_conn_id=gcp_conn_id,
impersonation_chain=impersonation_chain,
**kwargs,
)
self.api_version = api_version
[docs] def wait_for_operation(self, operation: dict[str, Any]) -> dict[str, Any]:
"""Wait for long-lasting operation to complete."""
for time_to_wait in exponential_sleep_generator(initial=10, maximum=120):
time.sleep(time_to_wait)
operation = (
self.get_conn().projects().locations().operations().get(name=operation.get("name")).execute()
)
if operation.get("done"):
break
if "error" in operation:
raise AirflowException(operation["error"])
return operation["response"]
[docs] def wait_for_pipeline_state(
self,
pipeline_name: str,
pipeline_id: str,
instance_url: str,
pipeline_type: DataFusionPipelineType = DataFusionPipelineType.BATCH,
namespace: str = "default",
success_states: list[str] | None = None,
failure_states: list[str] | None = None,
timeout: int = 5 * 60,
) -> None:
"""Poll for pipeline state and raises an exception if the state fails or times out."""
failure_states = failure_states or FAILURE_STATES
success_states = success_states or SUCCESS_STATES
start_time = time.monotonic()
current_state = None
while time.monotonic() - start_time < timeout:
try:
workflow = self.get_pipeline_workflow(
pipeline_name=pipeline_name,
pipeline_id=pipeline_id,
pipeline_type=pipeline_type,
instance_url=instance_url,
namespace=namespace,
)
current_state = workflow["status"]
except AirflowException:
pass # Because the pipeline may not be visible in system yet
if current_state in success_states:
return
if current_state in failure_states:
raise AirflowException(
f"Pipeline {pipeline_name} state {current_state} is not one of {success_states}"
)
time.sleep(30)
# Time is up!
raise AirflowException(
f"Pipeline {pipeline_name} state {current_state} is not "
f"one of {success_states} after {timeout}s"
)
@staticmethod
def _name(project_id: str, location: str, instance_name: str) -> str:
return f"projects/{project_id}/locations/{location}/instances/{instance_name}"
@staticmethod
def _parent(project_id: str, location: str) -> str:
return f"projects/{project_id}/locations/{location}"
@staticmethod
def _base_url(instance_url: str, namespace: str) -> str:
return os.path.join(instance_url, "v3", "namespaces", quote(namespace), "apps")
def _cdap_request(
self, url: str, method: str, body: list | dict | None = None, params: dict | None = None
) -> google.auth.transport.Response:
headers: dict[str, str] = {"Content-Type": "application/json"}
request = google.auth.transport.requests.Request()
credentials = self.get_credentials()
credentials.before_request(request=request, method=method, url=url, headers=headers)
payload = json.dumps(body) if body else None
response = request(method=method, url=url, headers=headers, body=payload, params=params)
return response
@staticmethod
def _check_response_status_and_data(response, message: str) -> None:
if response.status == 404:
raise AirflowNotFoundException(message)
elif response.status == 409:
raise ConflictException("Conflict: Resource is still in use.")
elif response.status != 200:
raise AirflowException(message)
if response.data is None:
raise AirflowException(
"Empty response received. Please, check for possible root "
"causes of this behavior either in DAG code or on Cloud DataFusion side"
)
[docs] def get_conn(self) -> Resource:
"""Retrieve connection to DataFusion."""
if not self._conn:
http_authorized = self._authorize()
self._conn = build(
"datafusion",
self.api_version,
http=http_authorized,
cache_discovery=False,
)
return self._conn
@GoogleBaseHook.fallback_to_default_project_id
[docs] def restart_instance(self, instance_name: str, location: str, project_id: str) -> Operation:
"""
Restart a single Data Fusion instance.
At the end of an operation instance is fully restarted.
:param instance_name: The name of the instance to restart.
:param location: The Cloud Data Fusion location in which to handle the request.
:param project_id: The ID of the Google Cloud project that the instance belongs to.
"""
operation = (
self.get_conn()
.projects()
.locations()
.instances()
.restart(name=self._name(project_id, location, instance_name))
.execute(num_retries=self.num_retries)
)
return operation
@GoogleBaseHook.fallback_to_default_project_id
[docs] def delete_instance(self, instance_name: str, location: str, project_id: str) -> Operation:
"""
Delete a single Date Fusion instance.
:param instance_name: The name of the instance to delete.
:param location: The Cloud Data Fusion location in which to handle the request.
:param project_id: The ID of the Google Cloud project that the instance belongs to.
"""
operation = (
self.get_conn()
.projects()
.locations()
.instances()
.delete(name=self._name(project_id, location, instance_name))
.execute(num_retries=self.num_retries)
)
return operation
@GoogleBaseHook.fallback_to_default_project_id
[docs] def create_instance(
self,
instance_name: str,
instance: dict[str, Any],
location: str,
project_id: str = PROVIDE_PROJECT_ID,
) -> Operation:
"""
Create a new Data Fusion instance in the specified project and location.
:param instance_name: The name of the instance to create.
:param instance: An instance of Instance.
https://cloud.google.com/data-fusion/docs/reference/rest/v1beta1/projects.locations.instances#Instance
:param location: The Cloud Data Fusion location in which to handle the request.
:param project_id: The ID of the Google Cloud project that the instance belongs to.
"""
operation = (
self.get_conn()
.projects()
.locations()
.instances()
.create(
parent=self._parent(project_id, location),
body=instance,
instanceId=instance_name,
)
.execute(num_retries=self.num_retries)
)
return operation
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance(self, instance_name: str, location: str, project_id: str) -> dict[str, Any]:
"""
Get details of a single Data Fusion instance.
:param instance_name: The name of the instance.
:param location: The Cloud Data Fusion location in which to handle the request.
:param project_id: The ID of the Google Cloud project that the instance belongs to.
"""
instance = (
self.get_conn()
.projects()
.locations()
.instances()
.get(name=self._name(project_id, location, instance_name))
.execute(num_retries=self.num_retries)
)
return instance
[docs] def get_instance_artifacts(
self, instance_url: str, namespace: str = "default", scope: str = "SYSTEM"
) -> Any:
url = os.path.join(
instance_url,
"v3",
"namespaces",
quote(namespace),
"artifacts",
)
response = self._cdap_request(url=url, method="GET", params={"scope": scope})
self._check_response_status_and_data(
response, f"Retrieving an instance artifacts failed with code {response.status}"
)
content = json.loads(response.data)
return content
@GoogleBaseHook.fallback_to_default_project_id
[docs] def patch_instance(
self,
instance_name: str,
instance: dict[str, Any],
update_mask: str,
location: str,
project_id: str = PROVIDE_PROJECT_ID,
) -> Operation:
"""
Update a single Data Fusion instance.
:param instance_name: The name of the instance to create.
:param instance: An instance of Instance.
https://cloud.google.com/data-fusion/docs/reference/rest/v1beta1/projects.locations.instances#Instance
:param update_mask: Field mask is used to specify the fields that the update will overwrite
in an instance resource. The fields specified in the updateMask are relative to the resource,
not the full request. A field will be overwritten if it is in the mask. If the user does not
provide a mask, all the supported fields (labels and options currently) will be overwritten.
A comma-separated list of fully qualified names of fields. Example: "user.displayName,photo".
https://developers.google.com/protocol-buffers/docs/reference/google.protobuf?_ga=2.205612571.-968688242.1573564810#google.protobuf.FieldMask
:param location: The Cloud Data Fusion location in which to handle the request.
:param project_id: The ID of the Google Cloud project that the instance belongs to.
"""
operation = (
self.get_conn()
.projects()
.locations()
.instances()
.patch(
name=self._name(project_id, location, instance_name),
updateMask=update_mask,
body=instance,
)
.execute(num_retries=self.num_retries)
)
return operation
[docs] def create_pipeline(
self,
pipeline_name: str,
pipeline: dict[str, Any],
instance_url: str,
namespace: str = "default",
) -> None:
"""
Create a batch Cloud Data Fusion pipeline.
:param pipeline_name: Your pipeline name.
:param pipeline: The pipeline definition. For more information check:
https://docs.cdap.io/cdap/current/en/developer-manual/pipelines/developing-pipelines.html#pipeline-configuration-file-format
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param namespace: if your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
"""
url = os.path.join(self._base_url(instance_url, namespace), quote(pipeline_name))
response = self._cdap_request(url=url, method="PUT", body=pipeline)
self._check_response_status_and_data(
response, f"Creating a pipeline failed with code {response.status} while calling {url}"
)
[docs] def delete_pipeline(
self,
pipeline_name: str,
instance_url: str,
version_id: str | None = None,
namespace: str = "default",
) -> None:
"""
Delete a batch Cloud Data Fusion pipeline.
:param pipeline_name: Your pipeline name.
:param version_id: Version of pipeline to delete
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param namespace: if your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
"""
url = os.path.join(self._base_url(instance_url, namespace), quote(pipeline_name))
if version_id:
url = os.path.join(url, "versions", version_id)
for time_to_wait in exponential_sleep_generator(initial=1, maximum=10):
try:
response = self._cdap_request(url=url, method="DELETE", body=None)
self._check_response_status_and_data(
response, f"Deleting a pipeline failed with code {response.status}: {response.data}"
)
except ConflictException as exc:
self.log.info(exc)
time.sleep(time_to_wait)
else:
if response.status == 200:
break
[docs] def list_pipelines(
self,
instance_url: str,
artifact_name: str | None = None,
artifact_version: str | None = None,
namespace: str = "default",
) -> dict:
"""
List Cloud Data Fusion pipelines.
:param artifact_version: Artifact version to filter instances
:param artifact_name: Artifact name to filter instances
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param namespace: f your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
"""
url = self._base_url(instance_url, namespace)
query: dict[str, str] = {}
if artifact_name:
query = {"artifactName": artifact_name}
if artifact_version:
query = {"artifactVersion": artifact_version}
if query:
url = os.path.join(url, urlencode(query))
response = self._cdap_request(url=url, method="GET", body=None)
self._check_response_status_and_data(
response, f"Listing pipelines failed with code {response.status}"
)
return json.loads(response.data)
[docs] def get_pipeline_workflow(
self,
pipeline_name: str,
instance_url: str,
pipeline_id: str,
pipeline_type: DataFusionPipelineType = DataFusionPipelineType.BATCH,
namespace: str = "default",
) -> Any:
url = os.path.join(
self._base_url(instance_url, namespace),
quote(pipeline_name),
f"{self.cdap_program_type(pipeline_type=pipeline_type)}s",
self.cdap_program_id(pipeline_type=pipeline_type),
"runs",
quote(pipeline_id),
)
response = self._cdap_request(url=url, method="GET")
self._check_response_status_and_data(
response, f"Retrieving a pipeline state failed with code {response.status}"
)
workflow = json.loads(response.data)
return workflow
[docs] def start_pipeline(
self,
pipeline_name: str,
instance_url: str,
pipeline_type: DataFusionPipelineType = DataFusionPipelineType.BATCH,
namespace: str = "default",
runtime_args: dict[str, Any] | None = None,
) -> str:
"""
Start a Cloud Data Fusion pipeline. Works for both batch and stream pipelines.
:param pipeline_name: Your pipeline name.
:param pipeline_type: Optional pipeline type (BATCH by default).
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param runtime_args: Optional runtime JSON args to be passed to the pipeline
:param namespace: if your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
"""
# TODO: This API endpoint starts multiple pipelines. There will eventually be a fix
# return the run Id as part of the API request to run a single pipeline.
# https://github.com/apache/airflow/pull/8954#discussion_r438223116
url = os.path.join(
instance_url,
"v3",
"namespaces",
quote(namespace),
"start",
)
runtime_args = runtime_args or {}
body = [
{
"appId": pipeline_name,
"runtimeargs": runtime_args,
"programType": self.cdap_program_type(pipeline_type=pipeline_type),
"programId": self.cdap_program_id(pipeline_type=pipeline_type),
}
]
response = self._cdap_request(url=url, method="POST", body=body)
self._check_response_status_and_data(
response, f"Starting a pipeline failed with code {response.status}"
)
response_json = json.loads(response.data)
return response_json[0]["runId"]
[docs] def stop_pipeline(self, pipeline_name: str, instance_url: str, namespace: str = "default") -> None:
"""
Stop a Cloud Data Fusion pipeline. Works for both batch and stream pipelines.
:param pipeline_name: Your pipeline name.
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param namespace: f your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
"""
url = os.path.join(
self._base_url(instance_url, namespace),
quote(pipeline_name),
"workflows",
"DataPipelineWorkflow",
"stop",
)
response = self._cdap_request(url=url, method="POST")
self._check_response_status_and_data(
response, f"Stopping a pipeline failed with code {response.status}"
)
@staticmethod
[docs] def cdap_program_type(pipeline_type: DataFusionPipelineType) -> str:
"""
Retrieve CDAP Program type depending on the pipeline type.
:param pipeline_type: Pipeline type.
"""
program_types = {
DataFusionPipelineType.BATCH: "workflow",
DataFusionPipelineType.STREAM: "spark",
}
return program_types.get(pipeline_type, "")
@staticmethod
[docs] def cdap_program_id(pipeline_type: DataFusionPipelineType) -> str:
"""
Retrieve CDAP Program id depending on the pipeline type.
:param pipeline_type: Pipeline type.
"""
program_ids = {
DataFusionPipelineType.BATCH: "DataPipelineWorkflow",
DataFusionPipelineType.STREAM: "DataStreamsSparkStreaming",
}
return program_ids.get(pipeline_type, "")
[docs]class DataFusionAsyncHook(GoogleBaseAsyncHook):
"""Class to get asynchronous hook for DataFusion."""
[docs] sync_hook_class = DataFusionHook
[docs] scopes = ["https://www.googleapis.com/auth/cloud-platform"]
@staticmethod
def _base_url(instance_url: str, namespace: str) -> str:
return urljoin(f"{instance_url}/", f"v3/namespaces/{quote(namespace)}/apps/")
async def _get_link(self, url: str, session):
# Adding sleep generator to catch 404 in case if pipeline was not retrieved during first attempt.
for time_to_wait in exponential_sleep_generator(initial=10, maximum=120):
async with Token(scopes=self.scopes) as token:
session_aio = AioSession(session)
headers = {
"Authorization": f"Bearer {await token.get()}",
}
try:
pipeline = await session_aio.get(url=url, headers=headers)
break
except Exception as exc:
if "404" in str(exc):
await asyncio.sleep(time_to_wait)
else:
raise
if pipeline:
return pipeline
else:
raise AirflowException("Could not retrieve pipeline. Aborting.")
[docs] async def get_pipeline(
self,
instance_url: str,
namespace: str,
pipeline_name: str,
pipeline_id: str,
session,
pipeline_type: DataFusionPipelineType = DataFusionPipelineType.BATCH,
):
program_type = self.sync_hook_class.cdap_program_type(pipeline_type=pipeline_type)
program_id = self.sync_hook_class.cdap_program_id(pipeline_type=pipeline_type)
base_url_link = self._base_url(instance_url, namespace)
url = urljoin(
base_url_link, f"{quote(pipeline_name)}/{program_type}s/{program_id}/runs/{quote(pipeline_id)}"
)
return await self._get_link(url=url, session=session)
[docs] async def get_pipeline_status(
self,
pipeline_name: str,
instance_url: str,
pipeline_id: str,
pipeline_type: DataFusionPipelineType = DataFusionPipelineType.BATCH,
namespace: str = "default",
success_states: list[str] | None = None,
) -> str:
"""
Get a Cloud Data Fusion pipeline status asynchronously.
:param pipeline_name: Your pipeline name.
:param instance_url: Endpoint on which the REST APIs is accessible for the instance.
:param pipeline_id: Unique pipeline ID associated with specific pipeline.
:param pipeline_type: Optional pipeline type (by default batch).
:param namespace: if your pipeline belongs to a Basic edition instance, the namespace ID
is always default. If your pipeline belongs to an Enterprise edition instance, you
can create a namespace.
:param success_states: If provided the operator will wait for pipeline to be in one of
the provided states.
"""
success_states = success_states or SUCCESS_STATES
async with ClientSession() as session:
try:
pipeline = await self.get_pipeline(
instance_url=instance_url,
namespace=namespace,
pipeline_name=pipeline_name,
pipeline_id=pipeline_id,
pipeline_type=pipeline_type,
session=session,
)
pipeline = await pipeline.json(content_type=None)
current_pipeline_state = pipeline["status"]
if current_pipeline_state in success_states:
pipeline_status = "success"
elif current_pipeline_state in FAILURE_STATES:
pipeline_status = "failed"
else:
pipeline_status = "pending"
except OSError:
pipeline_status = "pending"
except Exception as e:
self.log.info("Retrieving pipeline status finished with errors...")
pipeline_status = str(e)
return pipeline_status