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Median Microservice

A simple Flask-powered microservice that calculates the median of integers.

Endpoints

  • /put (POST/PUT): Store an integer for one minute. Expects a JSON object in the following structure:

    {
        "int": <integer>
    }
  • /median (GET): Initiate a median calculation request for all stored integers received over the last minute. Returns a JSON object in the following format:

    {
        "job_id": <job_id>,
        "url": <url_for_result>
    }
  • /median-results/<job_id> (GET): See results of a median calculation request.

    • HTTP 200: Calculation complete. Returns a JSON object in the following format:

      {
          "message": "Calculation complete!",
          "median": <median>
      }
    • HTTP 202: Calculation not-yet complete. Returns a JSON object in the following format:

      {
          "message": "Still processing..."
      }

Local Development Setup

Dependencies:

  • Redis 3.0.x
  • Python 2.7.x
    • Flask==0.10.1
    • numpy==1.11.0
    • redis==2.10.5
    • rq==0.5.6

Installation Instructions

  1. Clone this repo to your local machine:

    $ git clone [email protected]:respondcreate/median-microservice.git
  2. Create a new virtual environment and install dependencies:

    $ cd median-microservice
    $ virtualenv ENV
    $ source ENV/bin/activate
    $ cd web/
    $ pip install -r requirements.txt
  3. Start-up the microservice:

    $ python app.py
  4. Open a new shell, activate the virtualenv and start the redis queue consumer (worker.py):

    $ cd median-microservice
    $ source ENV/bin/activate
    $ cd web/
    $ python worker.py

Now visit http://127.0.0.1:5000/put/50 to put your first integer (50) into the microservice!

Running Tests

Run tests with this command (be sure your virtualenv is activated before running):

$ python web/app_tests.py

Docker Commands

The following commands assume you have both docker-machine and docker-compose installed.

Building a docker-machine

  1. Create a machine with docker-machine:

    Locally, with virtualbox:

    $ docker-machine create -d virtualbox median-microservice

    On DigitalOcean (assumes you have a valid DigitalOcean token set to the DO_TOKEN environment variable):

    $ docker-machine create -d digitalocean --digitalocean-access-token=$DO_TOKEN median-microservice

    On Amazon AWS (assumes you have ~/.aws/credentials set appropriately):

    $ docker-machine create --driver amazonec2 --amazonec2-zone=b docker-demo
  2. Make the median-microservice docker machine your 'current' one:

    $ eval "$(docker-machine env median-microservice)"

Spinning up with docker-compose

  1. First, build:

    $ docker-compose build
  2. Spin up the server:

    With development settings:

    $ docker-compose up -d

    With production settings:

    $ docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

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