Web changes for Kensetsu configurable stables

gistfile1.txt

async subscribeOnAverageCollateralPrices(context): Promise<void> {
    const { commit, state } = vaultActionContext(context);
    const { collaterals, averageCollateralPriceSubscriptions } = state;
    const newIds: string[] = [];
    const idsToRemove: string[] = [];
    // Check if there are new collateral assets or some of them were removed
    // TODO Please, check - stablecoins may be different as well as collaterals
    for (const collateralId in collaterals) {
      if (!(collateralId in averageCollateralPriceSubscriptions)) {
        newIds.push(collateralId);
      }
    }
    for (const priceSubId in averageCollateralPriceSubscriptions) {
      if (!(priceSubId in collaterals)) {
        idsToRemove.push(priceSubId);
      }
    }
    // Unsubscribe from removed collateral assets
    if (idsToRemove.length) {
      commit.removeAverageCollateralPriceSubscriptions(idsToRemove);
    }
    if (!newIds.length) {
      return;
    }
    // Subscribe on new collateral assets if they are not subscribed yet
    const newSubscriptions: Record<string, Subscription> = {};
    // TODO should be CollateralAssetId and StablecoinAssetId
    for (const collateralAddress of newIds) {
      // TODO get StablecoinInfo for StablecoinAssetId like:
      // https://github.com/sora-xor/sora2-network/blob/master/pallets/kensetsu/src/lib.rs#L1176
      // if StablecoinInfo pegged to Oracle (band), then 
      //   1. get collateral price in DAI (as it now with `getAveragePrice(collateralAddress, DAI, Sell)`
      //      (https://github.com/sora-xor/sora2-network/blob/master/pallets/kensetsu/src/lib.rs#L1184)
      //   2. get PegAsset price from Band, it is in USD, StablecoinInfo contains Peg Symbol for Oracle
      //      (https://github.com/sora-xor/sora2-network/blob/master/pallets/kensetsu/src/lib.rs#L1190)
      //   3. collateral_price = collateral_price_in_dai / oracle_price, simply divide (1) by (2)
      //      (https://github.com/sora-xor/sora2-network/blob/master/pallets/kensetsu/src/lib.rs#L1199)
      // else StablecoinInfo pegged to Sora with PegAssetId, then
      //   StablecoinInfo contains PegAssetId
      //   getAveragePrice(collateralAddress, PegAssetId, Sell)
      //   (https://github.com/sora-xor/sora2-network/blob/master/pallets/kensetsu/src/lib.rs#L1199)
      
      if (collateralAddress !== DaiAddress) {
        const sub = api.swap.subscribeOnReserves(collateralAddress, DaiAddress)?.subscribe((payload) => {
          try {
            const averagePrice = getAveragePrice(collateralAddress, DaiAddress, PriceVariant.Sell, payload);
            commit.setAverageCollateralPrice({ address: collateralAddress, price: averagePrice });
          } catch (error) {
            commit.setAverageCollateralPrice({ address: collateralAddress, price: null });
            console.warn(`[Kensetsu] getAveragePrice with ${collateralAddress}`, error);
          }
        });
        if (sub) {
          newSubscriptions[collateralAddress] = sub;
        }
      }
    }
    commit.setAverageCollateralPriceSubscriptions(newSubscriptions);
  }