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from airflow.hooks.base_hook import BaseHook
import requests
from airflow import AirflowException
[docs]class OpenFaasHook(BaseHook):
"""
Interact with Openfaas to query, deploy, invoke and update function
:param function_name: Name of the function, Defaults to None
:type query: str
:param conn_id: openfass connection to use, Defaults to open_faas_default
for example host : http://openfaas.faas.com, Conn Type : Http
:type conn_id: str
"""
[docs] GET_FUNCTION = "/system/function/"
[docs] INVOKE_ASYNC_FUNCTION = "/async-function/"
[docs] DEPLOY_FUNCTION = "/system/functions"
[docs] UPDATE_FUNCTION = "/system/functions"
def __init__(self,
function_name=None,
conn_id='open_faas_default',
*args, **kwargs):
self.function_name = function_name
self.conn_id = conn_id
super(BaseHook, self).__init__(*args, **kwargs)
[docs] def get_conn(self):
conn = self.get_connection(self.conn_id)
return conn
[docs] def deploy_function(self, overwrite_function_if_exist, body):
if overwrite_function_if_exist:
self.log.info("Function already exist " + self.function_name + " going to update")
self.update_function(body)
else:
url = self.get_conn().host + self.DEPLOY_FUNCTION
self.log.info("Deploying function " + url)
response = requests.post(url, body)
if response.status_code != OK_STATUS_CODE:
self.log.error("Response status " + str(response.status_code))
self.log.error("Failed to deploy")
raise AirflowException('failed to deploy')
else:
self.log.info("Function deployed " + self.function_name)
[docs] def invoke_async_function(self, body):
url = self.get_conn().host + self.INVOKE_ASYNC_FUNCTION + self.function_name
self.log.info("Invoking function " + url)
response = requests.post(url, body)
if response.ok:
self.log.info("Invoked " + self.function_name)
else:
self.log.error("Response status " + str(response.status_code))
raise AirflowException('failed to invoke function')
[docs] def update_function(self, body):
url = self.get_conn().host + self.UPDATE_FUNCTION
self.log.info("Updating function " + url)
response = requests.put(url, body)
if response.status_code != OK_STATUS_CODE:
self.log.error("Response status " + str(response.status_code))
self.log.error("Failed to update response " + response.content.decode("utf-8"))
raise AirflowException('failed to update ' + self.function_name)
else:
self.log.info("Function was updated")
[docs] def does_function_exist(self):
url = self.get_conn().host + self.GET_FUNCTION + self.function_name
response = requests.get(url)
if response.ok:
return True
else:
self.log.error("Failed to find function " + self.function_name)
return False