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Acala EVM+ Truffle 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

compile contracts and build types

yarn build

get the predeploy ACA token info with scripts/getACAinfo.js

yarn getInfo:mandala

run tests with test/*.js

yarn test:mandala

run with public mandala

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

yarn deploy:mandalaPub
yarn test:mandalaPub

More References