Voter Service

Introduction

The Voter Spring Boot Service is a RESTful Web Service, backed by MongoDB, using Atlas on GCP, and RabbitMQ, using CloudAMQP on GCP. It is part of the Voter API (see diagram below). The Voter service exposes several HTTP API endpoints, listed below. API users can review a list candidates, submit a vote, view voting results, and inspect technical information about the running service.

Voter Service Endpoints

The service uses a context path of /voter. All endpoints must be are prefixed with this sub-path.

Purpose	Method	Endpoint
List All Service Endpoints	GET	/voter/mappings
Create Vote	POST	/voter/voters
Read Vote	GET	/voter/voters/{id}
Read Votes	GET	/voter/voters
Update Vote	PUT	/voter/voters/{id}
Delete Vote	DELETE	/voter/voters/{id}
List Candidates	GET	/voter/candidates/{election}
View Voting Results	GET	/voter/results/{election}
View Total Votes	GET	/voter/results/{election}/votes
View Winner(s)	GET	/voter/winners/{election}
View Winning Vote Count	GET	/voter/winners/{election}/votes
Drop All Candidates	POST	/voter/drop/candidates
Drop All Votes	POST	/voter/drop/votes
Service Info	GET	/voter/info
Service Health	GET	/voter/health
Other Spring Actuator endpoints	GET	voter/actuator, voter/metrics, voter/env, voter/configprops, etc.
Other HATEOAS endpoints for /voter/votes	Various	page sort, size, etc.

The HAL Browser API browser for the hal+json media type is installed alongside the service. It can be accessed at http://localhost:8099/voter/actuator/.

Voting

Submitting a new candidate requires an HTTP POST request to the /voter/votes endpoint, as follows:

HTTPie

http POST http://localhost:8099/voter/votes \
  candidate="Jill Stein" \
  election="2016 Presidential Election"

cURL

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{ "candidate": "Jill Stein", "election": "2016 Presidential Election" }' \
  "http://localhost:8099/voter/votes"

wget

wget --method POST \
  --header 'content-type: application/json' \
  --body-data '{ "candidate": "Jill Stein", "election": "2016 Presidential Election" }' \
  --no-verbose \
  --output-document - http://localhost:8099/voter/votes

Sample Output

API users can also create random voting data by calling the /voter/simulation endpoint. Using HTTPie command line HTTP client.

http http://localhost:8099/voter/simulation/2016%20Presidential%20Election

{
    "message": "Simulation data created!"
}

http http://localhost:8099/voter/candidates/db/2016%20Presidential%20Election

{
    "candidates": [
        {
            "election": "2016 Presidential Election",
            "fullName": "Darrell Castle",
            "politicalParty": "Constitution Party"
        },
        {
            "election": "2016 Presidential Election",
            "fullName": "Hillary Clinton",
            "politicalParty": "Democratic Party"
        },
        {
            "election": "2016 Presidential Election",
            "fullName": "Gary Johnson",
            "politicalParty": "Libertarian Party"
        }
    ]
}

http http://localhost:8099/voter/results/2016%20Presidential%20Election

{
    "results": [
        {
            "candidate": "Darrell Castle",
            "votes": 19
        },
        {
            "candidate": "Donald Trump",
            "votes": 15
        },
        {
            "candidate": "Gary Johnson",
            "votes": 15
        },
        {
            "candidate": "Jill Stein",
            "votes": 13
        }
    ]
}

http http://localhost:8099/voter/results/2016%20Presidential%20Election/votes

{
    "votes": 80
}

http http://localhost:8099/voter/winners/2016%20Presidential%20Election

{
    "results": [
        {
            "candidate": "Darrell Castle",
            "votes": 19
        }
    ]
}

http http://localhost:8099/voter/winners/2016%20Presidential%20Election/votes

{
    "votes": 19
}

http POST http://localhost:8099/voter/votes \
    candidate="Jill Stein" \
    election="2016 Presidential Election"

{
    "_links": {
        "self": {
            "href": "http://localhost:8099/voter/votes/590548541b8ebf700f9c2a62"
        },
        "candidate": {
            "href": "http://localhost:8099/voter/votes/590548541b8ebf700f9c2a62"
        }
    },
    "candidate": "Jill Stein",
    "election": "2016 Presidential Election"
}