Awesome

Hyperledger Fabric dev setup for chaincode development

This repo contains out of a setup which makes it easy to develop node.js chaincode.

Only node.js chaincode is supported, go is not implemented yet. Feel free to help out and create a pull request.

For more info on developing chaincode please have a look at the online tutorial.

CLI API

Installing

npm install @kunstmaan/hyperledger-fabric-chaincode-dev-setup -g

With the following command you can get an overview of all the commands available:

kuma-hf-chaincode-dev -h

Dependency: this tool required Node version >= 8

Start dev network environment

Make sure you have at least version 1.3.0 of the docker images installed. For this you can use the following command:

kuma-hf-chaincode-dev setup-docker-images

Furthermore you must make sure that the 'chaincode destination directory' is accesible to docker using the docker file sharing preferences. If you didn't specify this directory you must make sure the path of the npm package itself is added to the docker file sharing preference.

Initialized project

When you want to start a dev network on an initialized project you can just run:

kuma-hf-chaincode-dev start-dev [optional -w]

In this case all configuration is found in the package.json.

When you want to run a dev network without using our project structure.

-w enables watch mode on the network.

Standalone mode

kuma-hf-chaincode-dev start-dev --cp ./example-chaincode/fabcar1 --cp ./example-chaincode/fabcar2 [optional -w]

cp stands for chaincodePath and you can replace the argument value with the path of the chaincode you wish to run. When running from many locations you can specifiy this argument multiple times using different values.

-w enables watch mode on the network.

Initializing new Project

kuma-hf-chaincode-dev init <path>

Initializes a new project structure within the given path. This will create a src/chaincodes, src/common and test folder structure. And will add the needed configuration within the package.json. If no package.json is found it will trigger npm init ..

• src/chaincodes is the folder that will contain all the chaincodes.
• src/common is the folder that contains all the shared code between all the chaincodes.
• test will be used for all the tests

This will also add the necesary configuration under the key kuma-hf-chaincode-dev to the package.jsonfor the other commands to use. This configuration can be overwritten.

• chaincodes: the list of all the chaincodes to deploy to the network
• sourcePath: the path to the src directory
• buildPath: the path to where the chaincode should be builded, the build process will integrate the common part into each chaincode
• testPath: the path to where the tests are
• dockerFile: this is configuration for setting up the dev network. By default this will use the default dockerFile integrated within this repository
• chaincodeDestination: the location where the chaincode should be moved so that it's mounted within the right docker container

Create new chaincode

kuma-hf-chaincode-dev create-chaincode <chaincode> [optional -d <description>]

Replace chaincode with the name of your chaincode. -d is optional and can be used to specify the description for the package.json of the chaincode.

Create new migration

kuma-hf-chaincode-dev create-migration <chaincode>

Generate a migration file for the given chaincode. This migration file can be used when installing our hyperledger-fabric-node-chaincode-utils package.

Build Chaincode

kuma-hf-chaincode-dev build

This will move the chaincodes to the buildPath and integrate the common part within each of them. This is useful for deploying to a real network. start-dev will also use this behind the scenes.

Cleanup chaincode on dev network

kuma-hf-chaincode-dev cleanup-chaincode

This will cleanup all the chaincode that's installed on the dev network. If you run this in an initialized project it will use that configuration else it will cleanup the chaincode from the standalone version.

Node.js API

You can also install this as an npm module in your project and run it within a node.js script.

Installing

npm install @kunstmaan/hyperledger-fabric-chaincode-dev-setup --save

const {setupDevEnv} = require('@kunstmaan/hyperledger-fabric-chaincode-dev-setup');

setupDevEnv({
    chaincodeLocations: [
        '/absolute/path/to/chaincode1',
        '/absolute/path/to/chaincode2'
    ],
    logOutputToConsole: (script, message) => {
        // 'script' return the full path to the script being executed
        // 'message' is the message which  would be written to the console
        // return false in case it should not be written to the console
        return true;
    },
    watchMode: false,
    dockerFile: './dev-network/generated/devmode/docker-compose-simple.yaml',
    chaincodeDestination: './dev-network/generated/devmode/chaincode',
    copyGlobPattern: '**/*'
}).then(() => {
    console.log('Dev env started.');
}).catch(() => {
    process.exit(1);
});

Watch mode

When this option is enabled the script will watch your chaincode directory for any changes. When a change happens the chaincode will deploy a newer version of the chaincode.

Changes to package.json will not be picked up, if you add a dependency you will need to restart the entire script.

What is the script doing

It automates the steps inside the tutorial. No need to setup many terminal windows. With this repo you'll only need to run a single script. It also watches for changes in the chaincode and automatically deploys them.

Steps which are done behind the scenes:

1. Setup a simple blockchain network
2. Install npm packages needed for the chaincode script
3. Build/deploy and instantiate the chaincode
4. Start watching the chaincode for changes, when a change happens an upgrade of the chaincode is done

Update the example network

The example network setup has been generated using the hyperledger-fabric-network-setup scripts.

Perform following steps to regenerate it:

1. Follow the installation steps
2. Run cd network-setup
3. Run sudo kuma-hf-network generate crypto-config.yaml