use crate::app::CosmosRouter;
use crate::error::{bail, AnyResult};
use crate::executor::AppResponse;
use crate::module::Module;
use crate::prefixed_storage::{prefixed, prefixed_read};
use crate::queries::bank::BankRemoteQuerier;
use crate::wasm_emulation::channel::RemoteChannel;
use crate::wasm_emulation::input::BankStorage;
use crate::wasm_emulation::query::AllBankQuerier;
use cosmwasm_std::{
coin, to_json_binary, Addr, AllBalanceResponse, Api, BalanceResponse, BankMsg, BankQuery,
Binary, BlockInfo, Coin, Event, Order, Querier, Storage,
};
use cosmwasm_std::{StdResult, SupplyResponse, Uint128};
use cw_storage_plus::Map;
use cw_utils::NativeBalance;
use itertools::Itertools;
use schemars::JsonSchema;
pub(crate) const BALANCES: Map<&Addr, NativeBalance> = Map::new("balances");
pub const NAMESPACE_BANK: &[u8] = b"bank";
#[derive(Clone, std::fmt::Debug, PartialEq, Eq, JsonSchema)]
pub enum BankSudo {
Mint {
to_address: String,
amount: Vec<Coin>,
},
}
pub trait Bank:
Module<ExecT = BankMsg, QueryT = BankQuery, SudoT = BankSudo> + AllBankQuerier
{
}
#[derive(Default)]
pub struct BankKeeper {
remote: Option<RemoteChannel>,
}
impl BankKeeper {
pub fn new() -> Self {
BankKeeper::default()
}
pub fn with_remote(mut self, remote: RemoteChannel) -> Self {
self.remote = Some(remote);
self
}
pub fn init_balance(
&self,
storage: &mut dyn Storage,
account: &Addr,
amount: Vec<Coin>,
) -> AnyResult<()> {
let mut bank_storage = prefixed(storage, NAMESPACE_BANK);
self.set_balance(&mut bank_storage, account, amount)
}
fn set_balance(
&self,
bank_storage: &mut dyn Storage,
account: &Addr,
amount: Vec<Coin>,
) -> AnyResult<()> {
let mut balance = NativeBalance(amount);
balance.normalize();
BALANCES
.save(bank_storage, account, &balance)
.map_err(Into::into)
}
fn get_balance(&self, bank_storage: &dyn Storage, account: &Addr) -> AnyResult<Vec<Coin>> {
if let Some(val) = BALANCES.may_load(bank_storage, account)? {
Ok(val.into_vec())
} else {
BankRemoteQuerier::get_balance(self.remote.clone().unwrap(), account)
}
}
fn get_supply(&self, bank_storage: &dyn Storage, denom: String) -> AnyResult<Coin> {
let supply: Uint128 = BALANCES
.range(bank_storage, None, None, Order::Ascending)
.collect::<StdResult<Vec<_>>>()?
.into_iter()
.map(|a| a.1)
.fold(Uint128::zero(), |accum, item| {
let mut subtotal = Uint128::zero();
for coin in item.into_vec() {
if coin.denom == denom {
subtotal += coin.amount;
}
}
accum + subtotal
});
Ok(coin(supply.into(), denom))
}
fn send(
&self,
bank_storage: &mut dyn Storage,
from_address: Addr,
to_address: Addr,
amount: Vec<Coin>,
) -> AnyResult<()> {
self.burn(bank_storage, from_address, amount.clone())?;
self.mint(bank_storage, to_address, amount)
}
fn mint(
&self,
bank_storage: &mut dyn Storage,
to_address: Addr,
amount: Vec<Coin>,
) -> AnyResult<()> {
let amount = self.normalize_amount(amount)?;
let b = self.get_balance(bank_storage, &to_address)?;
let b = NativeBalance(b) + NativeBalance(amount);
self.set_balance(bank_storage, &to_address, b.into_vec())
}
fn burn(
&self,
bank_storage: &mut dyn Storage,
from_address: Addr,
amount: Vec<Coin>,
) -> AnyResult<()> {
let amount = self.normalize_amount(amount)?;
let a = self.get_balance(bank_storage, &from_address)?;
let a = (NativeBalance(a) - amount)?;
self.set_balance(bank_storage, &from_address, a.into_vec())
}
fn normalize_amount(&self, amount: Vec<Coin>) -> AnyResult<Vec<Coin>> {
let res: Vec<_> = amount.into_iter().filter(|x| !x.amount.is_zero()).collect();
if res.is_empty() {
bail!("Cannot transfer empty coins amount")
} else {
Ok(res)
}
}
}
fn coins_to_string(coins: &[Coin]) -> String {
coins
.iter()
.map(|c| format!("{}{}", c.amount, c.denom))
.join(",")
}
impl Bank for BankKeeper {}
impl Module for BankKeeper {
type ExecT = BankMsg;
type QueryT = BankQuery;
type SudoT = BankSudo;
fn execute<ExecC, QueryC>(
&self,
_api: &dyn Api,
storage: &mut dyn Storage,
_router: &dyn CosmosRouter<ExecC = ExecC, QueryC = QueryC>,
_block: &BlockInfo,
sender: Addr,
msg: BankMsg,
) -> AnyResult<AppResponse> {
let mut bank_storage = prefixed(storage, NAMESPACE_BANK);
match msg {
BankMsg::Send { to_address, amount } => {
let events = vec![Event::new("transfer")
.add_attribute("recipient", &to_address)
.add_attribute("sender", &sender)
.add_attribute("amount", coins_to_string(&amount))];
self.send(
&mut bank_storage,
sender,
Addr::unchecked(to_address),
amount,
)?;
Ok(AppResponse { events, data: None })
}
BankMsg::Burn { amount } => {
self.burn(&mut bank_storage, sender, amount)?;
Ok(AppResponse::default())
}
m => bail!("Unsupported bank message: {:?}", m),
}
}
fn sudo<ExecC, QueryC>(
&self,
api: &dyn Api,
storage: &mut dyn Storage,
_router: &dyn CosmosRouter<ExecC = ExecC, QueryC = QueryC>,
_block: &BlockInfo,
msg: BankSudo,
) -> AnyResult<AppResponse> {
let mut bank_storage = prefixed(storage, NAMESPACE_BANK);
match msg {
BankSudo::Mint { to_address, amount } => {
let to_address = api.addr_validate(&to_address)?;
self.mint(&mut bank_storage, to_address, amount)?;
Ok(AppResponse::default())
}
}
}
fn query(
&self,
api: &dyn Api,
storage: &dyn Storage,
_querier: &dyn Querier,
_block: &BlockInfo,
request: BankQuery,
) -> AnyResult<Binary> {
let bank_storage = prefixed_read(storage, NAMESPACE_BANK);
match request {
BankQuery::AllBalances { address } => {
let address = api.addr_validate(&address)?;
let amount = self.get_balance(&bank_storage, &address)?;
let res = AllBalanceResponse::new(amount);
Ok(to_json_binary(&res)?)
}
BankQuery::Balance { address, denom } => {
let address = api.addr_validate(&address)?;
let all_amounts = self.get_balance(&bank_storage, &address)?;
let amount = all_amounts
.into_iter()
.find(|c| c.denom == denom)
.unwrap_or_else(|| coin(0, denom));
let res = BalanceResponse::new(amount);
Ok(to_json_binary(&res)?)
}
BankQuery::Supply { denom } => {
let amount = self.get_supply(&bank_storage, denom)?;
let res = SupplyResponse::new(amount);
Ok(to_json_binary(&res)?)
}
q => bail!("Unsupported bank query: {:?}", q),
}
}
}
impl AllBankQuerier for BankKeeper {
fn query_all(&self, storage: &dyn Storage) -> AnyResult<BankStorage> {
let bank_storage = prefixed_read(storage, NAMESPACE_BANK);
let balances: Result<Vec<_>, _> = BALANCES
.range(&bank_storage, None, None, Order::Ascending)
.collect();
Ok(BankStorage { storage: balances? })
}
}