Wallet Smart Contract

The ABI declaration is a separate project from your ABI implementation. The project structure for the code should be organized as follows with the wallet_abi treated as an external library:

. ├── wallet_abi │ ├── Forc.toml │ └── src │ └── main.sw └── wallet_smart_contract ├── Forc.toml └── src └── main.sw

It's also important to specify the source of the dependency within the project's Forc.toml file when using external libraries. Inside the wallet_smart_contract project, it requires a declaration like this:

[dependencies] wallet_abi = { path = "../wallet_abi/" }

ABI Declaration

library; abi Wallet { #[storage(read, write), payable] fn receive_funds(); #[storage(read, write)] fn send_funds(amount_to_send: u64, recipient_address: Address); }

ABI Implementation

contract; use std::{asset::transfer, call_frames::msg_asset_id, context::msg_amount,}; use wallet_abi::Wallet; const OWNER_ADDRESS = Address::from(0x8900c5bec4ca97d4febf9ceb4754a60d782abbf3cd815836c1872116f203f861); storage { balance: u64 = 0, } impl Wallet for Contract { #[storage(read, write), payable] fn receive_funds() { if msg_asset_id() == AssetId::base() { // If we received the base asset then keep track of the balance. // Otherwise, we're receiving other native assets and don't care // about our balance of coins. storage.balance.write(storage.balance.read() + msg_amount()); } } #[storage(read, write)] fn send_funds(amount_to_send: u64, recipient_address: Address) { let sender = msg_sender().unwrap(); match sender { Identity::Address(addr) => assert(addr == OWNER_ADDRESS), _ => revert(0), }; let current_balance = storage.balance.read(); assert(current_balance >= amount_to_send); storage.balance.write(current_balance - amount_to_send); // Note: `transfer()` is not a call and thus not an // interaction. Regardless, this code conforms to // checks-effects-interactions to avoid re-entrancy. transfer( Identity::Address(recipient_address), AssetId::base(), amount_to_send, ); } }