The logic is quite simple:
- You create a Piggy Bank where you define the lock time using Epoch Timestamp as the argument
- You can send an amount of EGLD to the smart contract, and it will be locked till the configured date
- You can then payout the amount, but only after the configured lock date
To interact with the PiggyBank Smart Contract, you would need to have:
You can get all with VSCode MultiversX IDE extension
To derive the wallet pem file, check the docs Deriving the Wallet PEM file
For simplicity, you can also deploy and interact using the dApp: https://piggy-bank-dapp.vercel.app/
mxpy contract build
Important You would need some xEGLD on the devnet. You can use the faucet: https://r3d4.fr/faucet. To get some xEGLD you can also use offcial Web Wallets (devnet/testnet) or there is also an option on official Discord channel.
To use testnet switch to --chain="T"
and --proxy="https://testnet-gateway.multiversx.com".
These commands should be run one folder up from the cloned 'multiversx-simple-sc' folder or you would need to adjust your --project path
Deploy the contract:
mxpy --verbose contract deploy --chain="D" --bytecode="./output/piggybank.wasm" --pem="../walletKey.pem" --gas-limit=80000000 --proxy="https://devnet-gateway.multiversx.com" --recall-nonce --send
Smart Contract deployment. You will need to do this once.
In the example, the project name is multiversx-simple-sc
, and the PEM file is located in ../walletKey.pem
.
You can also use snippets. In the terminal run . interactions/devnet.snippets.sh && deploy
.
Create the Piggy: (here, with the working SC address example, change it, if you deployed yours, you should have one)
mxpy --verbose contract call erd1qqqqqqqqqqqqqpgqvqphdwsdtd6cnlt025kuu9hzjqhnexgu67es8lqc44 --chain="D" --pem="../walletKey.pem" --gas-limit=5000000 --function="createPiggy" --arguments 1655316103 --proxy="https://devnet-gateway.multiversx.com" --recall-nonce --send
As an argument for the createPiggy
function, we will pass the timestamp for the lock time (it should be in the future, of course, use https://www.epochconverter.com/).
You can also use snippets. In the terminal run . interactions/devnet.snippets.sh && createPiggy
.
Add amount: (here, with the working SC address example, change it, if you deployed yours, you should have one)
mxpy --verbose contract call erd1qqqqqqqqqqqqqpgqvqphdwsdtd6cnlt025kuu9hzjqhnexgu67es8lqc44 --chain="D" --pem="../walletKey.pem" --gas-limit=5000000 --function="addAmount" --value=1000000000000000000 --proxy="https://devnet-gateway.multiversx.com" --recall-nonce --send
We are adding one xEGLD (denomination 18, this is why it is, in fact, 1000000000000000000).
You can also use snippets. In the terminal run . interactions/devnet.snippets.sh && addAmount
.
Payout: (here, with the working SC address example, change it, if you deployed yours, you should have one)
mxpy --verbose contract call erd1qqqqqqqqqqqqqpgqvqphdwsdtd6cnlt025kuu9hzjqhnexgu67es8lqc44 --chain="D" --pem="../walletKey.pem" --gas-limit=5000000 --function="payOut" --proxy="https://devnet-gateway.multiversx.com" --recall-nonce --send
It will check if you can withdraw. It will compare lock time and the current block timestamp.
You can also use snippets. In the terminal run . interactions/devnet.snippets.sh && payOut
.
Upgrade the contract: (here, with the working SC address example, change it, if you deployed yours, you should have one)
mxpy --verbose contract upgrade erd1qqqqqqqqqqqqqpgqvqphdwsdtd6cnlt025kuu9hzjqhnexgu67es8lqc44 --chain="D" --bytecode="./output/piggybank.wasm" --pem="../walletKey.pem" --gas-limit=20000000 --proxy="https://devnet-gateway.multiversx.com" --recall-nonce --send
You can also use snippets. In the terminal run . interactions/devnet.snippets.sh && upgrade
.
You will find interaction snippets in interactions/snippets.sh
. It is convenient to use when working with VSCode and MultiversX SDK plugin.
After deploying the smart contract, you need to edit the SC_ADDRESS
. Also, make sure that the relative path to your wallet PEM file is correct. You will need to set it in USER_PEM
.
You will find tests in tests/piggybank_rust_test.rs
. To run a test, you can use click on the Run Test
button from under the test name in VS Code or you can run it with cargo test --test piggybank_rust_test
.
Besides cloning the repository, you can also use buildo-begins CLI:
npx buildo-begins@latest init
- from the list, choose Piggy Bank smart contract. You can also initialize the dapp for interactions.