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import json
import time
from airflow import AirflowException, version
from airflow.hooks.base_hook import BaseHook
from google.api_core.exceptions import AlreadyExists
from google.api_core.gapic_v1.method import DEFAULT
from google.cloud import container_v1, exceptions
from google.cloud.container_v1.gapic.enums import Operation
from google.cloud.container_v1.types import Cluster
from google.protobuf import json_format
from google.api_core.gapic_v1.client_info import ClientInfo
OPERATIONAL_POLL_INTERVAL = 15
[docs]class GKEClusterHook(BaseHook):
def __init__(self, project_id, location):
self.project_id = project_id
self.location = location
# Add client library info for better error tracking
client_info = ClientInfo(client_library_version='airflow_v' + version.version)
self.client = container_v1.ClusterManagerClient(client_info=client_info)
def _dict_to_proto(self, py_dict, proto):
"""
Converts a python dictionary to the proto supplied
:param py_dict: The dictionary to convert
:type py_dict: dict
:param proto: The proto object to merge with dictionary
:type proto: protobuf
:return: A parsed python dictionary in provided proto format
:raises:
ParseError: On JSON parsing problems.
"""
dict_json_str = json.dumps(py_dict)
return json_format.Parse(dict_json_str, proto)
[docs] def wait_for_operation(self, operation):
"""
Given an operation, continuously fetches the status from Google Cloud until either
completion or an error occurring
:param operation: The Operation to wait for
:type operation: A google.cloud.container_V1.gapic.enums.Operator
:return: A new, updated operation fetched from Google Cloud
"""
self.log.info("Waiting for OPERATION_NAME %s" % operation.name)
time.sleep(OPERATIONAL_POLL_INTERVAL)
while operation.status != Operation.Status.DONE:
if operation.status == Operation.Status.RUNNING or operation.status == \
Operation.Status.PENDING:
time.sleep(OPERATIONAL_POLL_INTERVAL)
else:
raise exceptions.GoogleCloudError(
"Operation has failed with status: %s" % operation.status)
# To update status of operation
operation = self.get_operation(operation.name)
return operation
[docs] def get_operation(self, operation_name):
"""
Fetches the operation from Google Cloud
:param operation_name: Name of operation to fetch
:type operation_name: str
:return: The new, updated operation from Google Cloud
"""
return self.client.get_operation(project_id=self.project_id,
zone=self.location,
operation_id=operation_name)
def _append_label(self, cluster_proto, key, val):
"""
Append labels to provided Cluster Protobuf
Labels must fit the regex [a-z]([-a-z0-9]*[a-z0-9])? (current airflow version
string follows semantic versioning spec: x.y.z).
:param cluster_proto: The proto to append resource_label airflow version to
:type cluster_proto: google.cloud.container_v1.types.Cluster
:param key: The key label
:type key: str
:param val:
:type val: str
:return: The cluster proto updated with new label
"""
val = val.replace('.', '-').replace('+', '-')
cluster_proto.resource_labels.update({key: val})
return cluster_proto
[docs] def delete_cluster(self, name, retry=DEFAULT, timeout=DEFAULT):
"""
Deletes the cluster, including the Kubernetes endpoint and all
worker nodes. Firewalls and routes that were configured during
cluster creation are also deleted. Other Google Compute Engine
resources that might be in use by the cluster (e.g. load balancer
resources) will not be deleted if they weren’t present at the
initial create time.
:param name: The name of the cluster to delete
:type name: str
:param retry: Retry object used to determine when/if to retry requests.
If None is specified, requests will not be retried.
:type retry: google.api_core.retry.Retry
:param timeout: The amount of time, in seconds, to wait for the request to
complete. Note that if retry is specified, the timeout applies to each
individual attempt.
:type timeout: float
:return: The full url to the delete operation if successful, else None
"""
self.log.info("Deleting (project_id={}, zone={}, cluster_id={})".format(
self.project_id, self.location, name))
try:
op = self.client.delete_cluster(project_id=self.project_id,
zone=self.location,
cluster_id=name,
retry=retry,
timeout=timeout)
op = self.wait_for_operation(op)
# Returns server-defined url for the resource
return op.self_link
except exceptions.NotFound as error:
self.log.info('Assuming Success: ' + error.message)
[docs] def create_cluster(self, cluster, retry=DEFAULT, timeout=DEFAULT):
"""
Creates a cluster, consisting of the specified number and type of Google Compute
Engine instances.
:param cluster: A Cluster protobuf or dict. If dict is provided, it must be of
the same form as the protobuf message google.cloud.container_v1.types.Cluster
:type cluster: dict or google.cloud.container_v1.types.Cluster
:param retry: A retry object (google.api_core.retry.Retry) used to retry requests.
If None is specified, requests will not be retried.
:type retry: google.api_core.retry.Retry
:param timeout: The amount of time, in seconds, to wait for the request to
complete. Note that if retry is specified, the timeout applies to each
individual attempt.
:type timeout: float
:return: The full url to the new, or existing, cluster
:raises
ParseError: On JSON parsing problems when trying to convert dict
AirflowException: cluster is not dict type nor Cluster proto type
"""
if isinstance(cluster, dict):
cluster_proto = Cluster()
cluster = self._dict_to_proto(py_dict=cluster, proto=cluster_proto)
elif not isinstance(cluster, Cluster):
raise AirflowException(
"cluster is not instance of Cluster proto or python dict")
self._append_label(cluster, 'airflow-version', 'v' + version.version)
self.log.info("Creating (project_id={}, zone={}, cluster_name={})".format(
self.project_id,
self.location,
cluster.name))
try:
op = self.client.create_cluster(project_id=self.project_id,
zone=self.location,
cluster=cluster,
retry=retry,
timeout=timeout)
op = self.wait_for_operation(op)
return op.target_link
except AlreadyExists as error:
self.log.info('Assuming Success: ' + error.message)
return self.get_cluster(name=cluster.name).self_link
[docs] def get_cluster(self, name, retry=DEFAULT, timeout=DEFAULT):
"""
Gets details of specified cluster
:param name: The name of the cluster to retrieve
:type name: str
:param retry: A retry object used to retry requests. If None is specified,
requests will not be retried.
:type retry: google.api_core.retry.Retry
:param timeout: The amount of time, in seconds, to wait for the request to
complete. Note that if retry is specified, the timeout applies to each
individual attempt.
:type timeout: float
:return: A google.cloud.container_v1.types.Cluster instance
"""
self.log.info("Fetching cluster (project_id={}, zone={}, cluster_name={})".format(
self.project_id,
self.location,
name))
return self.client.get_cluster(project_id=self.project_id,
zone=self.location,
cluster_id=name,
retry=retry,
timeout=timeout).self_link