Dockerfile

FROM python:3-alpine
RUN pip install feedparser
RUN pip install flask
ADD my_script.py /
ADD owaction.py /
EXPOSE 5000
CMD [ "python", "./my_script.py" ]

owaction.py

import flask
import json

class OWAction(flask.Flask):

	def __init__(self, name='My Openwhisk Action'):
		flask.Flask.__init__(self,name)
		self.add_url_rule('/init', 'init', self.initroute, methods=['POST'])
		self.add_url_rule('/run', 'run', self.runner, methods=['POST'])
		self._func = None

	def initroute(self):
		return flask.Response('{}',
							  status=200,
							  mimetype='application/json')

	def json_dict(self, res):
		if isinstance(res, dict):
			return json.dumps(res)
		else:
			return json.dumps({'results': res})
		
	def runner(self):
		full_params = flask.request.get_json()
		if self._func:
			params = {}
			if full_params:
				params = full_params
			print(full_params)
			results = self._func(params)
			return flask.Response(response=self.json_dict(results),
								  status=200,
								  mimetype='application/json')
		else:
			resp_string = "{'error':'no function to run'}"
			return flask.Response(response=resp_string,
								  status=405,
								  mimetype='application/json')

	def action(self,func):
		self._func = func
		self.run(host='0.0.0.0')