hyperledger-vote-app

Blockchain vote app built with hyperledger composer https://www.builtwithblockchain.io/livepreview/vote-app/

This web app is meant to prove a simple vote use case and technichly this can be turned into real electronique election app and fit the regulators laws.

The project is built essentially with hyperledger fabric , hyperledger composer , reactjs for the client side , expressjs for the server side. The web app interact with hyperledger through the composer REST JSON server..

Structure

• vote-network :

Contain the hyperledger composer business newtork "where all the magic happens" and the REST JSON server sources.

• vote-app :
  • server :

  The server side Expressjs, this part expose what we need for the client web app.

  • client :

  The web app client app built with Reactjs ... the fun part.

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Install

1/ Get the Repo

git clone https://github.com/html5-ninja/hyperledger-vote-app.git

2/ Fabric & Composer

Now you need to get hyperledger fabric and hyperledger composer , all you need is here

- Installing pre-requisites

https://hyperledger.github.io/composer/latest/installing/installing-prereqs.html

- Installing the development environment

https://hyperledger.github.io/composer/latest/installing/development-tools.html

Note : Skip the Start the web app ("Playground") section.

3/ Deploying to Hyperledger Fabric for a single organization

cd ~/fabric-tools
./stopFabric.sh
./teardownFabric.sh
./downloadFabric.sh
./startFabric.sh

composer card delete -c PeerAdmin@fabric-network
composer card delete -c admin@vote-network

rm -fr ~/.composer

Creating a business network card for the Hyperledger Fabric administrator

composer card create -p connection.json -u PeerAdmin -c admincerts/Admin@org1.example.com-cert.pem -k keystore/xxxxxxx_your_keyxxxxxxxxx_sk -r PeerAdmin -r ChannelAdmin

Replace xxxxxxx_your_keyxxxxxxxxx_sk with your key , visit https://hyperledger.github.io/composer/latest/tutorials/deploy-to-fabric-single-org "Step Four: Locating the certificate and private key for the Hyperledger Fabric administrator" for more details.

Importing the business network card

composer card import -f PeerAdmin@vote-network.card

4/ Installing the Hyperledger Composer business network

we will install our vote app bna file

composer network install -c PeerAdmin@fabric-network -a [path to repo]/vote-network/vote-network@0.0.6.bna

5/ Starting the blockchain business network

composer network start --networkName vote-network --networkVersion 0.0.6 -A admin -S adminpw -c PeerAdmin@fabric-network

6/ Importing the business network card for the business network administrator

composer card import -f admin@vote-network.card

7/ Testing the connection to the blockchain business network

composer network ping -c admin@vote-network

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Run the app

first we need to install node modules, should be done once.

cd [path to hyperledger-vote-app]/vote-app/server/
npm install

cd [path to hyperledger-vote-app]/vote-app/client/
npm install

cd [path to hyperledger-vote-app]/vote-network/
npm install

Start the composer REST SERVER

cd [path to hyperledger-vote-app]/vote-network/
composer-rest-server -c admin@vote-network -n never -w true

This will start the composer REST SERVER on port 3000, the magic happen here http://localhost:3000
Now we will add candidates this is the assets on our business network

• go to http://localhost:3000/explorer/
• click "Candidate" and "POST"
• on "data" paste , it's the same data as the live demo

[
  {
    "name": "clinton",
    "votes": 0
  },
  {
    "name": "developer",
    "votes": 0
  },
  {
    "name": "trump",
    "votes": 0
  }
]

Start the app server side

cd [path to hyperledger-vote-app]/vote-app/server/
node app.js

Start the app client side

cd [path to hyperledger-vote-app]/vote-app/client/
npm start

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Have fun

If everything goes right open http://localhost:3002

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My to do list

• TODO[ ] : Deploying a Hyperledger Composer blockchain business network to Hyperledger Fabric (multiple organizations)
• TODO[ ] : Better UI
• TODO[ ] : fix minors bugs