Deploying a Smart Contact

In the dapp-offer-up tutorial you just went through you saw how quick and easy it was to deploy a contact on Agoric using the yarn start:contract command. Let's take a look at how this command works and what's going on behind the scenes.

How it Works

Running the yarn start:contract command in the tutorial runs a script which accomplishes several things:

• The script bundled the contract with the agoric run command
• The script collected some ATOM with the agd tx bank send command
• The script then used the ATOM to open a vault. This vault was used to mint enough IST to pay to install the bundles on chain with agops vaults open command
• The script then installed the bundles on chain with the agd tx swingset install-bundle command
• From there the script collected enough BLD to pay for a governance deposit with the agd tx bank send command
• Next, the script made a governance proposal to start the contract with the agd tx gov submit-proposal swingset-core-eval command
• Finally, the script voted for the proposal and waited for the proposal to pass.

Once again, we can reference the project's package.json file to learn a bit more about what yarn start:contract is doing behind the scenes.

  "scripts": {
    "start:docker": "cd contract && docker compose up -d",
    "docker:logs": "cd contract; docker compose logs --tail 200 -f",
    "docker:bash": "cd contract; docker compose exec agd bash",
    "docker:make": "cd contract; docker compose exec agd make -C /workspace/contract",
    "make:help": "make -C contract list",
    "start:contract": "cd contract && yarn start",
    "print-key": "yarn docker:make print-acct",
    "start:ui": "cd ui && yarn dev",
    "lint": "yarn workspaces run lint",
    "test": "yarn workspaces run test",
    "test:e2e": "yarn workspace offer-up-ui test:e2e",
    "build": "yarn workspaces run build"
  }

Note the calling the yarn start:contract command is the same as running yarn start from the contract directory. We can look at package.json from the contract directory to learn even more:

 "scripts": {
    "start:docker": "docker compose up -d",
    "docker:logs": "docker compose logs --tail 200 -f",
    "docker:bash": "docker compose exec agd bash",
    "docker:make": "docker compose exec agd make -C /workspace/contract",
    "make:help": "make list",
    "start": "yarn docker:make clean start-contract print-key",
    "build": "agoric run scripts/build-contract-deployer.js",
    "test": "ava --verbose",
    "lint": "eslint '**/*.js'",
    "lint:fix": "eslint --fix '**/*.js'"
  },

In the json snippet above note that the start command is running yarn docker:make clean start-contract print-key.

Video Walkthrough

As you're going through this explainer it may be helpful to watch this video walkthrough.