Add Folks Finance yield

package.json

@@ -27,6 +27,7 @@
     "graphql": "^15.5.1",
     "graphql-request": "^3.5.0",
     "lambert-w-function": "^3.0.0",
+    "limiter": "^2.1.0",
     "lodash": "^4.17.21",
     "node-fetch": "^2.6.1",
     "pg-promise": "^10.11.1",

src/adaptors/folks-finance-lending/helper/chain/algorand.js

@@ -0,0 +1,29 @@
+// documentation: https://developer.algorand.org/docs/get-details/indexer/?from_query=curl#sdk-client-instantiations
+
+const axios = require('axios');
+const { RateLimiter } = require('limiter');
+
+const axiosObj = axios.create({
+  baseURL: 'https://mainnet-idx.algonode.cloud',
+  timeout: 300000,
+});
+
+const indexerLimiter = new RateLimiter({
+  tokensPerInterval: 10,
+  interval: 'second',
+});
+
+async function lookupApplications(appId) {
+  return (await axiosObj.get(`/v2/applications/${appId}`)).data;
+}
+
+const withLimiter =
+  (fn, tokensToRemove = 1) =>
+  async (...args) => {
+    await indexerLimiter.removeTokens(tokensToRemove);
+    return fn(...args);
+  };
+
+module.exports = {
+  lookupApplications: withLimiter(lookupApplications),
+};

src/adaptors/folks-finance-lending/index.js

@@ -0,0 +1,68 @@
+const constants = require('./v2/constants');
+const {
+  getStakingProgram,
+  getPoolsInfo,
+  getDepositStakingProgramsInfo,
+  retrieveLoanInfo,
+} = require('./v2/index');
+const { interestRateToPercentage, ratioToPercentage } = require('./v2/utils');
+const utils = require('../utils');
+
+const { pools } = constants;
+
+const poolsFunction = async () => {
+  let poolArr = [];
+
+  const depositsStakingInfo = await getStakingProgram();
+  const { pools: poolsLoanInfo } = await retrieveLoanInfo();
+  pools.forEach(async (pool) => {
+    const poolInfo = await getPoolsInfo(pool);
+    const {
+      depositsUsd,
+      borrowsUsd,
+      depositInterestYield,
+      variableBorrowInterestYield,
+    } = poolInfo;
+    const totalSupplyUsd = Number(depositsUsd.toFixed(2));
+    const totalBorrowUsd = Number(borrowsUsd.toFixed(2));
+    const tvlUsd = Number((depositsUsd - borrowsUsd).toFixed(2));
+    const apyBase = interestRateToPercentage(depositInterestYield);
+    const apyBaseBorrow = interestRateToPercentage(variableBorrowInterestYield);
+    const ltv = ratioToPercentage(poolsLoanInfo[pool.appId].collateralFactor);
+
+    let dataSource = {
+      pool: `${pool.appId}-algorand`,
+      chain: utils.formatChain('algorand'),
+      project: 'folks-finance-lending',
+      symbol: utils.formatSymbol(pool.symbol),
+      tvlUsd,
+      totalSupplyUsd,
+      totalBorrowUsd,
+      apyBase,
+      apyBaseBorrow,
+      ltv,
+    };
+
+    if (pool.hasReward) {
+      const depositStakingInfo = depositsStakingInfo.find(
+        (deposit) => deposit.poolAppId === pool.appId
+      );
+
+      const dataSourceRewards = await getDepositStakingProgramsInfo(
+        depositStakingInfo,
+        poolInfo,
+        pool
+      );
+      dataSource = { ...dataSource, ...dataSourceRewards };
+    }
+
+    poolArr.push(dataSource);
+  });
+  return poolArr;
+};
+
+module.exports = {
+  timetravel: false,
+  apy: poolsFunction,
+  url: 'https://app.folks.finance/',
+};

src/adaptors/folks-finance-lending/v2/constants.js

@@ -0,0 +1,91 @@
+const pools = [
+  // ALGO
+  {
+    appId: 971368268,
+    assetId: 0,
+    fAssetId: 971381860,
+    symbol: 'ALGO',
+    hasReward: false,
+  },
+  // gALGO
+  {
+    appId: 971370097,
+    assetId: 793124631,
+    fAssetId: 971383839,
+    symbol: 'gALGO',
+    hasReward: false,
+  },
+  // USDC
+  {
+    appId: 971372237,
+    assetId: 31566704,
+    fAssetId: 971384592,
+    symbol: 'USDC',
+    hasReward: true,
+  },
+  // USDt
+  {
+    appId: 971372700,
+    assetId: 312769,
+    fAssetId: 971385312,
+    symbol: 'USDt',
+    hasReward: true,
+  },
+  // goBTC
+  {
+    appId: 971373361,
+    assetId: 386192725,
+    fAssetId: 971386173,
+    symbol: 'goBTC',
+    hasReward: false,
+  },
+  // goETH
+  {
+    appId: 971373611,
+    assetId: 386195940,
+    fAssetId: 971387073,
+    symbol: 'goETH',
+    hasReward: false,
+  },
+  // Opul
+  {
+    appId: 1044267181,
+    assetId: 287867876,
+    fAssetId: 1044269355,
+    symbol: 'OPUL',
+    hasReward: false,
+  },
+  // Gard
+  {
+    appId: 1060585819,
+    assetId: 684649988,
+    fAssetId: 1060587336,
+    symbol: 'GARD',
+    hasReward: false,
+  },
+  //WBTC
+  {
+    appId: 1067289273,
+    assetId: 1058926737,
+    fAssetId: 1067295154,
+    symbol: 'WBTC',
+    hasReward: false,
+  },
+  // WETH
+  {
+    appId: 1067289481,
+    assetId: 887406851,
+    fAssetId: 1067295558,
+    symbol: 'WETH',
+    hasReward: false,
+  },
+];
+
+const oracleAppId = 1040271396;
+const oracleDecimals = 14;
+
+module.exports = {
+  pools,
+  oracleAppId,
+  oracleDecimals,
+};