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"""This module contains a Google Compute Engine Hook."""
import time
from typing import Any, Dict, Optional, Sequence, Union
from googleapiclient.discovery import build
from airflow.exceptions import AirflowException
from airflow.providers.google.common.hooks.base_google import PROVIDE_PROJECT_ID, GoogleBaseHook
# Time to sleep between active checks of the operation results
[docs]TIME_TO_SLEEP_IN_SECONDS = 1
[docs]class GceOperationStatus:
"""Class with GCE operations statuses."""
[docs]class ComputeEngineHook(GoogleBaseHook):
"""
Hook for Google Compute Engine APIs.
All the methods in the hook where project_id is used must be called with
keyword arguments rather than positional.
"""
def __init__(
self,
api_version: str = 'v1',
gcp_conn_id: str = 'google_cloud_default',
delegate_to: Optional[str] = None,
impersonation_chain: Optional[Union[str, Sequence[str]]] = None,
) -> None:
super().__init__(
gcp_conn_id=gcp_conn_id,
delegate_to=delegate_to,
impersonation_chain=impersonation_chain,
)
self.api_version = api_version
_conn: Optional[Any] = None
[docs] def get_conn(self):
"""
Retrieves connection to Google Compute Engine.
:return: Google Compute Engine services object
:rtype: dict
"""
if not self._conn:
http_authorized = self._authorize()
self._conn = build('compute', self.api_version, http=http_authorized, cache_discovery=False)
return self._conn
@GoogleBaseHook.fallback_to_default_project_id
[docs] def start_instance(self, zone: str, resource_id: str, project_id: str) -> None:
"""
Starts an existing instance defined by project_id, zone and resource_id.
Must be called with keyword arguments rather than positional.
:param zone: Google Cloud zone where the instance exists
:param resource_id: Name of the Compute Engine instance resource
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: None
"""
response = (
self.get_conn()
.instances()
.start(project=project_id, zone=zone, instance=resource_id)
.execute(num_retries=self.num_retries)
)
try:
operation_name = response["name"]
except KeyError:
raise AirflowException(f"Wrong response '{response}' returned - it should contain 'name' field")
self._wait_for_operation_to_complete(project_id=project_id, operation_name=operation_name, zone=zone)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def stop_instance(self, zone: str, resource_id: str, project_id: str) -> None:
"""
Stops an instance defined by project_id, zone and resource_id
Must be called with keyword arguments rather than positional.
:param zone: Google Cloud zone where the instance exists
:param resource_id: Name of the Compute Engine instance resource
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: None
"""
response = (
self.get_conn()
.instances()
.stop(project=project_id, zone=zone, instance=resource_id)
.execute(num_retries=self.num_retries)
)
try:
operation_name = response["name"]
except KeyError:
raise AirflowException(f"Wrong response '{response}' returned - it should contain 'name' field")
self._wait_for_operation_to_complete(project_id=project_id, operation_name=operation_name, zone=zone)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def set_machine_type(self, zone: str, resource_id: str, body: dict, project_id: str) -> None:
"""
Sets machine type of an instance defined by project_id, zone and resource_id.
Must be called with keyword arguments rather than positional.
:param zone: Google Cloud zone where the instance exists.
:param resource_id: Name of the Compute Engine instance resource
:param body: Body required by the Compute Engine setMachineType API,
as described in
https://cloud.google.com/compute/docs/reference/rest/v1/instances/setMachineType
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: None
"""
response = self._execute_set_machine_type(zone, resource_id, body, project_id)
try:
operation_name = response["name"]
except KeyError:
raise AirflowException(f"Wrong response '{response}' returned - it should contain 'name' field")
self._wait_for_operation_to_complete(project_id=project_id, operation_name=operation_name, zone=zone)
def _execute_set_machine_type(self, zone: str, resource_id: str, body: dict, project_id: str) -> dict:
return (
self.get_conn()
.instances()
.setMachineType(project=project_id, zone=zone, instance=resource_id, body=body)
.execute(num_retries=self.num_retries)
)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance_template(self, resource_id: str, project_id: str) -> dict:
"""
Retrieves instance template by project_id and resource_id.
Must be called with keyword arguments rather than positional.
:param resource_id: Name of the instance template
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: Instance template representation as object according to
https://cloud.google.com/compute/docs/reference/rest/v1/instanceTemplates
:rtype: dict
"""
response = (
self.get_conn()
.instanceTemplates()
.get(project=project_id, instanceTemplate=resource_id)
.execute(num_retries=self.num_retries)
)
return response
@GoogleBaseHook.fallback_to_default_project_id
[docs] def insert_instance_template(
self,
body: dict,
project_id: str = PROVIDE_PROJECT_ID,
request_id: Optional[str] = None,
) -> None:
"""
Inserts instance template using body specified
Must be called with keyword arguments rather than positional.
:param body: Instance template representation as object according to
https://cloud.google.com/compute/docs/reference/rest/v1/instanceTemplates
:param request_id: Optional, unique request_id that you might add to achieve
full idempotence (for example when client call times out repeating the request
with the same request id will not create a new instance template again)
It should be in UUID format as defined in RFC 4122
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: None
"""
response = (
self.get_conn()
.instanceTemplates()
.insert(project=project_id, body=body, requestId=request_id)
.execute(num_retries=self.num_retries)
)
try:
operation_name = response["name"]
except KeyError:
raise AirflowException(f"Wrong response '{response}' returned - it should contain 'name' field")
self._wait_for_operation_to_complete(project_id=project_id, operation_name=operation_name)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance_group_manager(
self,
zone: str,
resource_id: str,
project_id: str = PROVIDE_PROJECT_ID,
) -> dict:
"""
Retrieves Instance Group Manager by project_id, zone and resource_id.
Must be called with keyword arguments rather than positional.
:param zone: Google Cloud zone where the Instance Group Manager exists
:param resource_id: Name of the Instance Group Manager
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: Instance group manager representation as object according to
https://cloud.google.com/compute/docs/reference/rest/beta/instanceGroupManagers
:rtype: dict
"""
response = (
self.get_conn()
.instanceGroupManagers()
.get(project=project_id, zone=zone, instanceGroupManager=resource_id)
.execute(num_retries=self.num_retries)
)
return response
@GoogleBaseHook.fallback_to_default_project_id
[docs] def patch_instance_group_manager(
self,
zone: str,
resource_id: str,
body: dict,
project_id: str,
request_id: Optional[str] = None,
) -> None:
"""
Patches Instance Group Manager with the specified body.
Must be called with keyword arguments rather than positional.
:param zone: Google Cloud zone where the Instance Group Manager exists
:param resource_id: Name of the Instance Group Manager
:param body: Instance Group Manager representation as json-merge-patch object
according to
https://cloud.google.com/compute/docs/reference/rest/beta/instanceTemplates/patch
:param request_id: Optional, unique request_id that you might add to achieve
full idempotence (for example when client call times out repeating the request
with the same request id will not create a new instance template again).
It should be in UUID format as defined in RFC 4122
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:return: None
"""
response = (
self.get_conn()
.instanceGroupManagers()
.patch(
project=project_id,
zone=zone,
instanceGroupManager=resource_id,
body=body,
requestId=request_id,
)
.execute(num_retries=self.num_retries)
)
try:
operation_name = response["name"]
except KeyError:
raise AirflowException(f"Wrong response '{response}' returned - it should contain 'name' field")
self._wait_for_operation_to_complete(project_id=project_id, operation_name=operation_name, zone=zone)
def _wait_for_operation_to_complete(
self, project_id: str, operation_name: str, zone: Optional[str] = None
) -> None:
"""
Waits for the named operation to complete - checks status of the async call.
:param operation_name: name of the operation
:param zone: optional region of the request (might be None for global operations)
:return: None
"""
service = self.get_conn()
while True:
if zone is None:
operation_response = self._check_global_operation_status(
service=service,
operation_name=operation_name,
project_id=project_id,
num_retries=self.num_retries,
)
else:
operation_response = self._check_zone_operation_status(
service, operation_name, project_id, zone, self.num_retries
)
if operation_response.get("status") == GceOperationStatus.DONE:
error = operation_response.get("error")
if error:
code = operation_response.get("httpErrorStatusCode")
msg = operation_response.get("httpErrorMessage")
# Extracting the errors list as string and trimming square braces
error_msg = str(error.get("errors"))[1:-1]
raise AirflowException(f"{code} {msg}: " + error_msg)
break
time.sleep(TIME_TO_SLEEP_IN_SECONDS)
@staticmethod
def _check_zone_operation_status(
service: Any, operation_name: str, project_id: str, zone: str, num_retries: int
) -> dict:
return (
service.zoneOperations()
.get(project=project_id, zone=zone, operation=operation_name)
.execute(num_retries=num_retries)
)
@staticmethod
def _check_global_operation_status(
service: Any, operation_name: str, project_id: str, num_retries: int
) -> dict:
return (
service.globalOperations()
.get(project=project_id, operation=operation_name)
.execute(num_retries=num_retries)
)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance_info(self, zone: str, resource_id: str, project_id: str) -> Dict[str, Any]:
"""
Gets instance information.
:param zone: Google Cloud zone where the Instance Group Manager exists
:param resource_id: Name of the Instance Group Manager
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
"""
instance_info = (
self.get_conn()
.instances()
.get(project=project_id, instance=resource_id, zone=zone)
.execute(num_retries=self.num_retries)
)
return instance_info
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance_address(
self, zone: str, resource_id: str, project_id: str = PROVIDE_PROJECT_ID, use_internal_ip: bool = False
) -> str:
"""
Return network address associated to instance.
:param zone: Google Cloud zone where the Instance Group Manager exists
:param resource_id: Name of the Instance Group Manager
:param project_id: Optional, Google Cloud project ID where the
Compute Engine Instance exists. If set to None or missing,
the default project_id from the Google Cloud connection is used.
:param use_internal_ip: If true, return private IP address.
"""
instance_info = self.get_instance_info(project_id=project_id, resource_id=resource_id, zone=zone)
if use_internal_ip:
return instance_info["networkInterfaces"][0].get("networkIP")
access_config = instance_info["networkInterfaces"][0].get("accessConfigs")
if access_config:
return access_config[0].get("natIP")
raise AirflowException("The target instance does not have external IP")
@GoogleBaseHook.fallback_to_default_project_id
