AlexandrouR / web3j-deployer

Library to define, configure and run Ethereum contract deployments and transactions

Web3j Deployer

A simple and lightweight library for managing deployments of Ethereum contracts and transactions.

Library is intended used by the Web3j CLI, but may also be used on its own.

Through the use of two annotations, @Predeploy and @Deployable, developers can define deploy configurations and deployment methods.

Let's start by looking at @Predeploy and how this is used to define a Deployer instance for a given network

package com.example.deployers

@Predeploy(profile = "my-deploy-profile")
public Deployer deployMyContract() {
    Credentials credentials = ...;

    Web3j web3j = Web3j.build(...);

    return new Deployer(web3j, new FastRawTransactionManager(web3j, credentials), new DefaultGasProvider(), "my-deploy-profile");
}

The profile name can be defined to whatever makes sense to you. Here we use my-deploy-profile as an example label.

Assuming you defined this within a package called com.example.deployers, you could obtain a reference to this deployer using the DeployTools:

String profile = "my-deploy-profile";
String pkgFilter = "com.example"
Deployer deployer = new DeployTools().findDeployer(profile, pkgFilter);

Next you want to define methods that allows you to use the deployer. Often, for complex contract setups, you have multiple steps during a deployment process. Using the @Deployable annotation you can define the order you want them to execute, starting low:

package com.example.deploy

@Deployable(order = 1)
public void deployA(Deployer deployer) {
   ...
}

@Deployable(order = 2)
public void deployB(Deployer deployer) {
   ...
}

@Deployable(order = 3)
public void deployC(Deployer deployer) {
   ...
}

When using runDeployer from DeployTools, it will execute these as deployA, deployB, and finally deployC due to the order value on each of the @Deployable annotations. Execute them like so:

public static void main(String... args) {
    String profile = "my-deploy-profile";
    String pkgFilter = "com.example";
    DeployTools deployTools = new DeployTools()
    Deployer deployer = deployTools.findDeployer(network, pkgFilter);
    deployTools.runDeployer(deployer, pkgFilter);
}

Gradle deploy task

If you include this library in your project, and also include it as a plugin, you can use the deploy task to deploy your contracts like so:

./gradlew deploy -Pprofile=my-profile -Ppackage=org.testing

To add this as a plugin to your gradle project, in build.gradle include, the below replaing x.y.z with the current version:

plugins {
    id 'org.web3j.deploy' version 'x.y.z'
}