buidler-deploy

buidler-deploy

A Plugin For Deployments

Buidler Deployment Plugin.

What

This buidler plugin adds a mechanism to deploy contracts to any network, keeping track of them and replicating the same environment for testing.

On top of that it adds a mechanism to add names to addresses so test and deployment scripts can be reconfigured by simply changing the address a name points to, allowing different configurations per network.

Installation

npm install buidler-deploy

And add the following statement to your buidler.config.js:

usePlugin('buidler-deploy');

Tasks

This plugin adds the deploy task to Buidler.

This task will execute the scripts in the deploy folder and save contract deployments.

Environment extensions

This plugin extends the Buidler Runtime Environment by adding two fields:

• namedAccounts: an object whose keys are names and values are addresses. It is parsed from the namedAccounts configuration (see Configuration). .- deployments: contains functions to access past deployments or to save new ones, as well as helpers functions.

Configuration

namedAccounts

This plugin extends the BuidlerConfig's object with an optional namedAccounts field.

namedAccounts allows you to associate names to addresses and have them configured per chain. This allows you to have meaningful names in your tests while the addresses match to multi sig in real network for example.

{
    namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            4: '0xffffeffffff', // but for rinkeby it will be a specific address
        },
        feeCollector:{
            default: 1, // here this will by default take the second account as feeCollector (so in the test this will be a different account than the deployer)
            1: '0xffffeaaa', // on the mainnet the feeCollector could be a multi sig
            4: '0xaaaeffffff', // on rinkeby it could be another account
        }
    }
}

paths

It also adds fields to BuidlerConfig's ProjectPaths object.

Here is an example showing the default values :

{
    paths: {
        deploy: 'deploy',
        deployments: 'deployments'
    }
}

Usage

deploy

buidler deploy --network <networkName>

This is a new task that the plugin adds. As the name suggests it deploys contracts. To be exact it will look for files in the folder deploy or whatever was configured in paths.deploy.

It will scan for files in alphabetical order and execute them in turn.

• it will require each of these files and execute the exported function with the BRE as argument

An example of a deploy script :

module.exports = async ({getNamedAccounts, deployments}) => {
    const {deploy} = deployments;
    const {deployer} = await getNamedAccounts();

    await deploy("GenericMetaTxProcessor",  {from: deployer, gas: 4000000}, args: []});
}

As you can see the BRE passed in has two new fields :

• getNamedAccounts is a function that returns a promise to an object whose keys are names and values are addresses. It is parsed from the namedAccounts configuration (see namedAccounts).
• deployments, which contains functions to access past deployments or to save new ones, as well as helpers functions.

Note that running buidler deploy without specifying a network will use the default network. If the default network is an internal ganache or buidlerevm then nothing will happen as a result but this can be used to ensure the deployment is without issues.

test

buidler test

The test task is like normal except that names are resolved and past deployment are loaded.

Tests can then use the bre.deployments.fixture function to run the deployment for the test and snapshot it so that tests don't need to perform all the deploy flow, they simply reuse the snapshot for every test (this leverages evm_snapshot and evm_revert provided by both buidlerevm and ganache). You can for example set them in a beaforeEach.

You can also specify to run a subset of the deploy scripts by specifying a tag or an array of tags.

A tag is simply a string value, that deploy scripts can advertise (see tags and dependencies).

Here is an example of a test :

const { deployments } = require('@nomiclabs/buidler');

describe("Token", () => {
    beforeEach(async () => {
      await deployments.fixture();
    })
    it("testing 1 2 3", async function() {
      const Token = await deployments.get('Token'); // Token is available because Token is a dependency of the ERC721BidSale deploy script
      console.log(Token.address);
      const ERC721BidSale = await deployments.get('ERC721BidSale');
      console.log({ERC721BidSale});
    });
});

node

buidler node

The node command is updated so that now when the node is serving, all contracts are already deployed.

It also adds an argument --export that allows you to specify a destination file where the info about the contracts deployed is written. Your webapp can then access all contracts information.

run

buidler run <script>

The run command is also updated in that now when the script runs it has access to contract deployments and can easily act on them via helper functions.

Here is an example of script that run can support:

const bre = require('@nomiclabs/buidler');
const { deployments, getNamedAccounts } = bre;

(async() => {
    console.log(await deployments.all())
    console.log({namedAccounts: await getNamedAccounts()});
})()

You can also run it directly from the command line as usual.

console

buidler console

The same applies to the console task.

compile

buidler compile

The compile command is also updated so that you could potentially have the compiler do different things depending on the deployed contract. Like for example you might want to inject the address of a deployed contract in the bytecode for efficiency reasons.

This is not yet enabled in any way though.

deploy scripts tags and dependencies

The following paragraphs were written before the deployments.fixture function was implemented and while it is possible to run a subset of the deploy scripts via run this is now mostly useful for partial deployments, in scripts for example as tests can now benefit from an even faster method via deployments.fixture.

When you run test, you want to replicate the same set of contracts that will be deployed without having to copy the deployment procedure. That is why the test have access to bre.deployments.run function to be able to easily setup the contracts for testing. Now though, for efficiency reasons, it would be nice if you could only deploy the necessary contracts for a particular test.

To help doing that, deploy script can setup tags and dependencies.

Tags represent what the deploy script acts on. In general it will be a single string value, the name of the contract it deploys or modifies.

Then if another deploy script has such tag as a dependency, then when this latter deploy script has a specific tag and that tag is requested, the dependency will be executed first.

Here is an example of two deploy scripts :

module.exports = async ({getNamedAccounts, deployments}) => {
    const {deployIfDifferent, log} = deployments;
    const namedAccounts = await getNamedAccounts();
    const {deployer} = namedAccounts;
    const deployResult = await deploy('Token', {from: deployer, args: ["hello", 100]});
    if (deployResult.newlyDeployed) {
        log(`contract Token deployed at ${deployResult.contract.address} using ${deployResult.receipt.gasUsed} gas`);
    }
}
module.exports.tags = ['Token'];

module.exports = async function({getNamedAccounts, deployments}) {
    const {deployIfDifferent, log} = deployments;
    const namedAccounts = await getNamedAccounts();
    const {deployer} = namedAccounts;
    const Token = await deployments.get('Token');
    const deployResult = await deploy('Sale', {from: deployer, contractName: 'ERC721BidSale', args: [Token.address, 1, 3600]});
    if (deployResult.newlyDeployed) {
        log(`contract Sale deployed at ${deployResult.contract.address} using ${deployResult.receipt.gasUsed} gas`);
    }
};
module.exports.tags = ['Sale'];
module.exports.dependencies = ['Token'];  // this ensure the TOken script above is executed first, so `deployments.get('Token') succeeds

As you can see the second one depends on the first. This is because the second script depends on a tag that the first script registers as using.

With that when bre.deployments.run is executed as follow :

bre.deployments.run(['Sale'])

then both scripts will be run, ensuring Sale is ready.

You can also define the script to run after another script is run by setting runAtTheEnd to be true. For example:

module.exports = async function({getNamedAccounts, deployments}) {
    const {deployIfDifferent, execute, log} = deployments;
    const namedAccounts = await getNamedAccounts();
    const {deployer, admin} = namedAccounts;
    await execute("Sale", {from: deployer}, "setAdmin", admin);
};
module.exports.tags = ['Sale'];
module.exports.runAtTheEnd = true;