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Acala EVM+ Hardhat Example: predeployed Token

This example introduces the use of Acala EVM+ precompiles and predeploys that are present on every network at a fixed address (the address of a predeployed contract is the same on a local development network, public test network as well as the production network). As this example focuses on showcasing the precompiles and predeploys, it doesn't have a smart conract. We will however interact with an predeployed ERC20 smart contract that is already deployed to the network and we will get all of the required imports from the @acala-network/contracts dependency. The precompiles and predeploys are a specific feature of the Acala EVM+, so this and the following tutorial is no longer compatible with traditional EVM development networks (like Ganache) or with the Hardhat's build in network emulator. Let's take a look!

Start a Local Development Stack

clean up docker containers

docker compose down -v

start the local development stack

cd ../   # compose file is at root dir
docker compose up

once you see logs like this, the local development stack is ready. It's ok if there are some warnings/errors in the logs, since there is no transaction in the node yet.

 --------------------------------------------
              🚀 SERVER STARTED 🚀
 --------------------------------------------
 version         : bodhi.js/eth-rpc-adapter/2.7.7
 endpoint url    : ws://mandala-node:9944
 subquery url    : http://graphql-engine:3001
 listening to    : 8545
 max blockCache  : 200
 max batchSize   : 50
 max storageSize : 5000
 safe mode       : false
 local mode      : false
 rich mode       : false
 http only       : false
 verbose         : true
 --------------------------------------------

For more information about the local development stack, please refer to the doc.

Run

install deps

yarn

get the predeploy ACA token info with scripts/getACAInfo.ts

yarn getInfo:mandala

run tests with test/*.ts

yarn test:mandala

run with public mandala

you can also run these scripts with public mandala by inserting your own account key to hardhat.config.ts, and then

yarn journey:mandalaPub
yarn test:mandalaPub

More References