Multi tool use

Python Falcon microservice that uses microservice?

I'm just getting started with Falcon and I'm trying to do something that I think should be very simple and basic. I simply want one of my services to send a request to another one.

Let me make it even more simple with a tiny code example. Here are two microservices. Service #1 stores a number, and service #2 increments a stored number.

class NumberResource:
def on_post(self, req, resp):
self.value = req.media.get('value')
resp.media = {'value': self.value}

def on_get(self, req, resp):
resp.media = {'value': self.value}

class NextNumberResource:
def on_get(self, req, resp):
sibling = {}
# TODO sibling = get("/number")
resp.media = {'value': sibling.value+1}

api = falcon.API()
api.add_route('/number', NumberResource())
api.add_route('/next', NextNumberResource())


Now I can store the number 17:

curl http://localhost:8000/number -d '{"value":17}'


And I can retrieve the stored value:

curl http://localhost:8000/number
{"value": 17}


I want to fill in the TODO line so that I can retrieve the calculated value:

curl http://localhost:8000/next
{"value": 18}


What's the best way to do that?

1 Answer
1

The best way to do this would be via OOP pattern in Python. An example could be like this (Albeit, it needs more defensive programming + serialization/de-serialization)

class SomeLogicHandler():

myValue #Important to have myValue as class variable and not as instance variable.

def __init__(self):
super(SomeLogicHandler, self).__init()
self.updateMyValue = self._updateMyValue
self.getMyValue = self._getMyValue

def _updateMyValue(self, value):
self.myValue+= value

def _getMyValue(self):
return {value: self.myValue}

class ApiRouteHandler(SomeLogicHandler):

def __init__(self):
super(ApiRouteHandler, self).__init__()

def on_post(self, req, resp):
#post implementation.
self.updateMyValue(req.media.get('value'))


class ApiRouteHandler2(SomeLogicHandler):

def __init__(self):
super(ApiRouteHandler2, self).__init__()

def on_get(self, req, resp):
#get implementation.
resp.body = self.getMyValue()


SomeLogicHandler

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.