Poller: Simple Live Poll in Go

A live poll in Go

Usage

Building and compiling

cd poller
go build
go get -u

Usage

The default JSON defines 2 polls, the format is:

{
  "poll1": {
    "pollDescription": "What number do you think is the best?",
    "options": {
      "1-one": "One is definitely the first",
      "2-two": "Two is better than one",
      "3-three": "Three is the magic number"
    }
  },
  "poll2": {
    "pollDescription": "Another silly poll, choose another number",
    "options": {
      "1-four": "Four is two plus two",
      "2-five": "Five is the number of fingers",
      "3-six": "Six is six"
    }
  }
}

Start several poller servers:

export APP_ID=10000 && ./poller start
export APP_ID=10001 && ./poller start --pollerAddress=localhost:8081
export APP_ID=10002 && ./poller start --pollerAddress=localhost:8082

Start a results server:

./poller results

Vote on different servers, for example:

curl -X POST http://localhost:8080/polls/poll1/1-one
curl -X POST http://localhost:8080/polls/poll1/2-two
curl -X POST http://localhost:8080/polls/poll1/3-three
curl -X POST http://localhost:8081/polls/poll1/2-two
curl -X POST http://localhost:8082/polls/poll1/3-three
curl -X POST http://localhost:8082/polls/poll1/3-three

curl -X POST http://localhost:8080/polls/poll2/1-four
curl -X POST http://localhost:8080/polls/poll2/1-four
curl -X POST http://localhost:8080/polls/poll2/1-four
curl -X POST http://localhost:8081/polls/poll2/2-five
curl -X POST http://localhost:8082/polls/poll2/3-six

The (not so nice, I know) voting GUI can be reached on each poller server:

http://localhost:8080/polls/poll1/leaveyourvote
http://localhost:8081/polls/poll2/leaveyourvote
http://localhost:8082/polls/poll1/leaveyourvote

Observe that results are aggregated on results server:

curl http://localhost:9090/results/polls/poll1
curl http://localhost:9090/results/polls/poll2

Or go to the fantastic results GUI at:

http://localhost:9090/static/results.html?poll=poll1
http://localhost:9090/static/results.html?poll=poll2

Building a Docker image

Standard Docker image

This image is built using the official golang image

sudo docker build .

Minimal Docker image

This image is built just with the binary and is just a few Mb.

CGO_ENABLED=0 go build -a -installsuffix cgo -o poller .
sudo docker build -f Dockerfile.minimal .

Getting help

./poller start -h
./poller results -h

Usage with Red Hat OpenShift

First, import the template into OpenShift:

oc create -f poller-openshift-template.yml -n openshift

Deploy from Service Catalog

Deploy the service Poller from the service catalog.

Enable the multicast into the project where you deployed the Poller.

oc annotate netnamespace <project> netnamespace.network.openshift.io/multicast-enabled=true

Deploy from CLI

Create the project.

oc new-project <project>

Enable the multicast into the project.

oc annotate netnamespace <project> netnamespace.network.openshift.io/multicast-enabled=true

Deploy the app.

oc new-app --template=poller-template -p APP_REPO=<gitRepo> -p APP_NAME=<name> -p APP_DOMAIN=<domain>