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//! # Proxy Asset
//! Proxy assets are objects that describe an asset and a way to calculate that asset's value against a base asset.
//!
//! ## Details
//! A proxy asset is composed of two components.
//! * The `asset`, which is an [`AssetInfo`].
//! * The [`PriceSource`] which is an enum that indicates how to calculate the value for that asset.
//!
//! The base asset is the asset for which `price_source` in `None`.
//! **There should only be ONE base asset when configuring your proxy**
use super::{
ans_host::AnsHost, asset_entry::AssetEntry, DexAssetPairing, LpToken, PoolAddress,
PoolReference,
};
use crate::{error::AbstractError, AbstractResult};
use cosmwasm_std::{
to_binary, Addr, Decimal, Deps, QuerierWrapper, QueryRequest, StdError, Uint128, WasmQuery,
};
use cw_asset::{Asset, AssetInfo};
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
/// represents the conversion of an asset in terms of the provided asset
/// Example: provided asset is ETH and the price source for ETH is the pair ETH/USD, the price is 100USD/ETH
/// then `AssetConversion { into: USD, ratio: 100}`
pub struct AssetConversion {
into: AssetInfo,
ratio: Decimal,
}
impl AssetConversion {
pub fn new(asset: impl Into<AssetInfo>, price: Decimal) -> Self {
Self {
into: asset.into(),
ratio: price,
}
}
/// convert the balance of an asset into a (list of) asset(s) given the provided rate(s)
pub fn convert(rates: &[Self], amount: Uint128) -> Vec<Asset> {
rates
.iter()
.map(|rate| Asset::new(rate.into.clone(), amount * rate.ratio))
.collect()
}
}
/// Provides information on how to calculate the value of an asset
#[derive(Deserialize, Serialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
#[non_exhaustive]
pub enum UncheckedPriceSource {
/// A pool address of an asset/asset pair
/// Both assets must be defined in the Proxy_assets state
Pair(DexAssetPairing),
// Liquidity Pool token
LiquidityToken {},
// a Proxy, the proxy also takes a Decimal (the multiplier)
// Asset will be valued as if they are Proxy tokens
ValueAs {
asset: AssetEntry,
multiplier: Decimal,
},
None,
}
impl UncheckedPriceSource {
pub fn check(
self,
deps: Deps,
ans_host: &AnsHost,
entry: &AssetEntry,
) -> AbstractResult<PriceSource> {
match self {
UncheckedPriceSource::Pair(pair_info) => {
let PoolReference {
pool_address,
unique_id,
} = ans_host
.query_asset_pairing(&deps.querier, &pair_info)?
.pop()
.unwrap();
let pool_assets = ans_host
.query_pool_metadata(&deps.querier, &unique_id)?
.assets;
let assets = ans_host.query_assets(&deps.querier, &pool_assets)?;
// TODO: fix this for pools with multiple assets
assert_eq!(assets.len(), 2);
// TODO: fix this for Osmosis pools
pool_address.expect_contract()?;
Ok(PriceSource::Pool {
address: pool_address,
pair: assets,
})
}
UncheckedPriceSource::LiquidityToken {} => {
let lp_token = LpToken::try_from(entry.clone())?;
let token_entry: AssetEntry = lp_token.clone().into();
let pairing = DexAssetPairing::try_from(token_entry)?;
let pool_assets = ans_host.query_assets(&deps.querier, &lp_token.assets)?;
// TODO: fix this for multiple pools with same pair
let pool_address = ans_host
.query_asset_pairing(&deps.querier, &pairing)?
.pop()
.unwrap()
.pool_address;
Ok(PriceSource::LiquidityToken {
pool_assets,
pool_address,
})
}
UncheckedPriceSource::ValueAs { asset, multiplier } => {
let asset_info = ans_host.query_asset(&deps.querier, &asset)?;
Ok(PriceSource::ValueAs {
asset: asset_info,
multiplier,
})
}
UncheckedPriceSource::None => Ok(PriceSource::None),
}
}
}
/// Provides information on how to calculate the value of an asset
#[derive(Deserialize, Serialize, Clone, Debug, PartialEq, JsonSchema)]
#[non_exhaustive]
pub enum PriceSource {
/// Should only be used for the base asset
None,
/// A pool name of an asset/asset pair
/// Both assets must be defined in the Vault_assets state
Pool {
address: PoolAddress,
/// two assets that make up a pair in the pool
pair: Vec<AssetInfo>,
},
/// Liquidity pool token
LiquidityToken {
pool_assets: Vec<AssetInfo>,
pool_address: PoolAddress,
},
/// Asset will be valued as if they are ValueAs.asset tokens
ValueAs {
asset: AssetInfo,
multiplier: Decimal,
},
}
impl PriceSource {
/// Returns the assets that are required to calculate the price of the asset
/// Panics if the price source is None
pub fn dependencies(&self, asset: &AssetInfo) -> Vec<AssetInfo> {
match self {
// return the other asset as the dependency
PriceSource::Pool { pair, .. } => {
pair.iter().filter(|a| *a != asset).cloned().collect()
}
PriceSource::LiquidityToken { pool_assets, .. } => pool_assets.clone(),
PriceSource::ValueAs { asset, .. } => vec![asset.clone()],
PriceSource::None => vec![],
}
}
/// Calculates the conversion ratio of the asset.
pub fn conversion_rates(
&self,
deps: Deps,
asset: &AssetInfo,
) -> AbstractResult<Vec<AssetConversion>> {
// Is there a reference to calculate the price?
// each method must return the price of the asset in terms of the another asset, accept for the base asset.
match self {
// A Pool refers to a swap pair, the ratio of assets in the pool represents the price of the asset in the other asset's denom
PriceSource::Pool { address, pair } => self
.trade_pair_price(deps, asset, &address.expect_contract()?, pair)
.map(|e| vec![e]),
// Liquidity is an LP token,
PriceSource::LiquidityToken {
pool_address,
pool_assets,
} => self.lp_conversion(deps, asset, &pool_address.expect_contract()?, pool_assets),
// A proxy asset is used instead
PriceSource::ValueAs { asset, multiplier } => {
Ok(vec![AssetConversion::new(asset.clone(), *multiplier)])
}
// None means it's the base asset
PriceSource::None => Ok(vec![]),
}
}
/// Calculates the price of an asset compared to some other asset through the provided trading pair.
fn trade_pair_price(
&self,
deps: Deps,
priced_asset: &AssetInfo,
address: &Addr,
pair: &[AssetInfo],
) -> AbstractResult<AssetConversion> {
let other_asset_info = pair.iter().find(|a| a != &priced_asset).unwrap();
// query assets held in pool, gives price
let pool_info = (
other_asset_info.query_balance(&deps.querier, address)?,
priced_asset.query_balance(&deps.querier, address)?,
);
// other / this
let ratio = Decimal::from_ratio(pool_info.0.u128(), pool_info.1.u128());
// Get the conversion ratio in the denom of this asset
// #other = #this * (pool_other/pool_this)
Ok(AssetConversion::new(other_asset_info.clone(), ratio))
}
/// Calculate the conversions of an LP token
/// Uses the lp token name to query pair pool for both assets
/// Returns the conversion ratio of the LP token in terms of the other asset
fn lp_conversion(
&self,
deps: Deps,
lp_asset: &AssetInfo,
pool: &Addr,
pool_assets: &[AssetInfo],
) -> AbstractResult<Vec<AssetConversion>> {
let supply: Uint128;
if let AssetInfo::Cw20(addr) = lp_asset {
supply = query_cw20_supply(&deps.querier, addr)?;
} else {
return Err(StdError::generic_err("Can't have a native LP token").into());
}
pool_assets
.iter()
.map(|a| {
let balance = a
.query_balance(&deps.querier, pool.clone())
.map_err(AbstractError::from)?;
Ok(AssetConversion::new(
a.clone(),
Decimal::from_ratio(balance.u128(), supply.u128()),
))
})
.collect::<AbstractResult<Vec<AssetConversion>>>()
}
}
fn query_cw20_supply(querier: &QuerierWrapper, contract_addr: &Addr) -> AbstractResult<Uint128> {
let response: cw20::TokenInfoResponse =
querier.query(&QueryRequest::Wasm(WasmQuery::Smart {
contract_addr: contract_addr.into(),
msg: to_binary(&cw20::Cw20QueryMsg::TokenInfo {})?,
}))?;
Ok(response.total_supply)
}