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Merge pull request #28 from FuelLabs/vault-standard-with-subvaults
Vault standard with subvaults
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| [workspace] | ||
| members = ["src_3", "src_5", "src_20"] | ||
| members = ["src_3", "src_5", "src_6", "src_20"] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| contract; | ||
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| use std::{ | ||
| auth::msg_sender, | ||
| call_frames::msg_asset_id, | ||
| context::msg_amount, | ||
| hash::Hash, | ||
| storage::{ | ||
| storage_map::*, | ||
| storage_string::StorageString, | ||
| }, | ||
| token::{ | ||
| burn, | ||
| mint, | ||
| transfer, | ||
| }, | ||
| }; | ||
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| use src_6::{Deposit, SRC6, Withdraw}; | ||
| use src_20::SRC20; | ||
| use std::string::String; | ||
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| storage { | ||
| total_assets: u64 = 0, | ||
| total_supply: StorageMap<AssetId, u64> = StorageMap {}, | ||
| name: StorageMap<AssetId, StorageString> = StorageMap {}, | ||
| symbol: StorageMap<AssetId, StorageString> = StorageMap {}, | ||
| decimals: StorageMap<AssetId, u8> = StorageMap {}, | ||
| } | ||
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| impl SRC6 for Contract { | ||
| #[storage(read)] | ||
| fn managed_assets(asset: AssetId) -> u64 { | ||
| managed_assets(asset) // In this implementation managed_assets and max_withdrawable are the same. However in case of lending out of assets, managed_assets should be greater than max_withdrawable. | ||
| } | ||
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| #[storage(read, write)] | ||
| fn deposit(receiver: Identity) -> u64 { | ||
| let assets = msg_amount(); | ||
| let asset = msg_asset_id(); | ||
| let shares = preview_deposit(asset, assets); | ||
| require(assets != 0, "ZERO_ASSETS"); | ||
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| let _ = _mint(receiver, asset.into(), shares); // Using the asset_id as the sub_id for shares. | ||
| storage.total_supply.insert(asset, storage.total_supply.get(asset).read() + shares); | ||
| after_deposit(); | ||
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| log(Deposit { | ||
| caller: msg_sender().unwrap(), | ||
| receiver: receiver, | ||
| asset: asset, | ||
| assets: assets, | ||
| shares: shares, | ||
| }); | ||
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| shares | ||
| } | ||
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| #[storage(read, write)] | ||
| fn withdraw(asset: AssetId, receiver: Identity) -> u64 { | ||
| let shares = msg_amount(); | ||
| require(shares != 0, "ZERO_SHARES"); | ||
| require(msg_asset_id() == AssetId::new(ContractId::this(), asset.into()), "INVALID_ASSET_ID"); | ||
| let assets = preview_withdraw(asset, shares); | ||
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| _burn(asset.into(), shares); | ||
| storage.total_supply.insert(asset, storage.total_supply.get(asset).read() - shares); | ||
| after_withdraw(); | ||
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| transfer(receiver, asset, assets); | ||
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| log(Withdraw { | ||
| caller: msg_sender().unwrap(), | ||
| receiver: receiver, | ||
| asset: asset, | ||
| assets: assets, | ||
| shares: shares, | ||
| }); | ||
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| assets | ||
| } | ||
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| #[storage(read)] | ||
| fn convert_to_shares(asset: AssetId, assets: u64) -> Option<u64> { | ||
| Option::Some(preview_deposit(asset, assets)) | ||
| } | ||
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| #[storage(read)] | ||
| fn convert_to_assets(asset: AssetId, shares: u64) -> Option<u64> { | ||
| Option::Some(preview_withdraw(asset, shares)) | ||
| } | ||
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| #[storage(read)] | ||
| fn max_depositable(asset: AssetId) -> Option<u64> { | ||
| Option::Some(18_446_744_073_709_551_615 - managed_assets(asset)) // This is the max value of u64 minus the current managed_assets. Ensures that the sum will always be lower than u64::MAX. | ||
| } | ||
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| #[storage(read)] | ||
| fn max_withdrawable(asset: AssetId) -> Option<u64> { | ||
| Option::Some(managed_assets(asset)) // In this implementation total_assets and max_withdrawable are the same. However in case of lending out of assets, total_assets should be greater than max_withdrawable. | ||
| } | ||
| } | ||
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| impl SRC20 for Contract { | ||
| #[storage(read)] | ||
| fn total_assets() -> u64 { | ||
| storage.total_assets.try_read().unwrap_or(0) | ||
| } | ||
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| #[storage(read)] | ||
| fn total_supply(asset: AssetId) -> Option<u64> { | ||
| storage.total_supply.get(asset).try_read() | ||
| } | ||
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| #[storage(read)] | ||
| fn name(asset: AssetId) -> Option<String> { | ||
| storage.name.get(asset).read_slice() | ||
| } | ||
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| #[storage(read)] | ||
| fn symbol(asset: AssetId) -> Option<String> { | ||
| storage.symbol.get(asset).read_slice() | ||
| } | ||
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| #[storage(read)] | ||
| fn decimals(asset: AssetId) -> Option<u8> { | ||
| storage.decimals.get(asset).try_read() | ||
| } | ||
| } | ||
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| fn managed_assets(asset: AssetId) -> u64 { | ||
| std::context::this_balance(asset) | ||
| } | ||
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| #[storage(read)] | ||
| fn preview_deposit(asset: AssetId, assets: u64) -> u64 { | ||
| let shares_supply = storage.total_supply.get(AssetId::new(ContractId::this(), asset.into())).read(); | ||
| if shares_supply == 0 { | ||
| assets | ||
| } else { | ||
| assets * shares_supply / managed_assets(asset) | ||
| } | ||
| } | ||
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| #[storage(read)] | ||
| fn preview_withdraw(asset: AssetId, shares: u64) -> u64 { | ||
| let supply = storage.total_supply.get(AssetId::new(ContractId::this(), asset.into())).read(); | ||
| if supply == shares { | ||
| managed_assets(asset) | ||
| } else { | ||
| shares * (managed_assets(asset) / supply) | ||
| } | ||
| } | ||
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| fn after_deposit() { | ||
| // Does nothing, only for demonstration purposes. | ||
| } | ||
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| fn after_withdraw() { | ||
| // Does nothing, only for demonstration purposes. | ||
| } | ||
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| #[storage(read, write)] | ||
| pub fn _mint(recipient: Identity, sub_id: SubId, amount: u64) -> AssetId { | ||
| let asset_id = AssetId::new(contract_id(), sub_id); | ||
| let supply = storage.total_supply.get(asset).try_read(); | ||
| // Only increment the number of assets minted by this contract if it hasn't been minted before. | ||
| if supply.is_none() { | ||
| storage.total_assets.write(_total_assets(storage.total_assets) + 1); | ||
| } | ||
| let current_supply = supply.unwrap_or(0); | ||
| storage.total_supply.insert(asset_id, current_supply + amount); | ||
| mint_to(recipient, sub_id, amount); | ||
| asset_id | ||
| } | ||
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| #[storage(read, write)] | ||
| pub fn _burn(sub_id: SubId, amount: u64) { | ||
| let asset_id = AssetId::new(contract_id(), sub_id); | ||
| require(this_balance(asset_id) >= amount, BurnError::NotEnoughTokens); | ||
| // If we pass the check above, we can assume it is safe to unwrap. | ||
| let supply = storage.total_supply.get(asset).try_read().unwrap(); | ||
| storage.total_supply.insert(asset_id, supply - amount); | ||
| burn(sub_id, amount); | ||
| } |
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