README.md

flask-change-microservice

Small Flask Microservice that makes change

Coursera Lab: duke-coursera-ccb-lab2

Invoke Endpoint

• Create virtualenv and source it: python3 -m venv ~/.fcm && source ~/.venv/bin/fcm
• Install and Test: make all
• Run it: python app.py
• Invoke it. Options include curl, Postman, httpie. These methods are documented below

Curl

curl http://127.0.0.1:8080/change/1/34

[
  {
    "5": "quarters"
  }, 
  {
    "1": "nickels"
  }, 
  {
    "4": "pennies"
  }
]

httpie

Installation of httpie

http 127.0.0.1:8080/change/1/34

HTTP/1.0 200 OK
Content-Length: 90
Content-Type: application/json
Date: Tue, 16 Mar 2021 16:49:11 GMT
Server: Werkzeug/1.0.1 Python/3.9.0

[
    {
        "5": "quarters"
    },
    {
        "1": "nickels"
    },
    {
        "4": "pennies"
    }
]

Postman

Install Postman

Requests

The Python requests library allows you to invoke a request as a "one-liner" or a script.

python -c "import requests;r=requests.get('http://127.0.0.1:8080/change/1/34');print(r.json())"

Result:

[{'5': 'quarters'}, {'1': 'nickels'}, {'4': 'pennies'}]

Loadtest with Locust

• Install Locust
• Create a locustfile.py
• Run loadtests