feat: add mstable adaptor (#1072)

src/adaptors/mstable-yield/index.js

@@ -0,0 +1,100 @@
+const BN = require('bignumber.js');
+const { request, gql } = require('graphql-request');
+
+const { formatChain } = require('../utils');
+
+const DHEDGE_API_URL = 'https://api-v2.dhedge.org/graphql';
+
+const MSTABLE_POOL_ADDRESSES = ['0x9c6de13d4648a6789017641f6b1a025816e66228'];
+
+const MSTABLE_VAULT_BASE_URL = 'https://yield.mstable.org/vault/';
+
+const FUNDS_QUERY = gql`
+  query GetAllFundsByAddresses($addresses: [String]!) {
+    allFundsByAddresses(addresses: $addresses) {
+      address
+      blockchainCode
+      blockTime
+      fundComposition {
+        amount
+        tokenAddress
+      }
+      performanceMetrics {
+        week
+        month
+        quarter
+        halfyear
+        year
+      }
+      symbol
+      totalValue
+      apy {
+        monthly
+        weekly
+      }
+    }
+  }
+`;
+
+const formatValue = (value) => new BN(value).shiftedBy(-18).toNumber();
+
+const getDaysSincePoolCreation = (blockTime) =>
+  Math.round((Date.now() / 1000 - +blockTime) / 86400);
+
+// APY with fallback calculation simply based on pool's past performance
+const calcApy = (apy, blockTime, metrics) => {
+  if (apy) {
+    return Math.max(...Object.values(apy));
+  }
+
+  const daysActive = getDaysSincePoolCreation(blockTime);
+  return daysActive >= 360
+    ? (formatValue(metrics.year) - 1) * 100
+    : daysActive >= 180
+    ? (formatValue(metrics.halfyear) - 1) * 2 * 100
+    : daysActive >= 90
+    ? (formatValue(metrics.quarter) - 1) * 4 * 100
+    : daysActive >= 30
+    ? (formatValue(metrics.month) - 1) * 12 * 100
+    : (formatValue(metrics.week) - 1) * 52 * 100;
+};
+const poolsFunction = async () => {
+  try {
+    const { allFundsByAddresses } = await request(DHEDGE_API_URL, FUNDS_QUERY, {
+      addresses: MSTABLE_POOL_ADDRESSES,
+    });
+
+    return allFundsByAddresses.map(
+      ({
+        address,
+        blockchainCode,
+        symbol,
+        totalValue,
+        performanceMetrics,
+        blockTime,
+        fundComposition,
+        apy,
+      }) => ({
+        pool: address,
+        chain: formatChain(blockchainCode.toLowerCase()),
+        project: 'mstable-yield',
+        symbol,
+        tvlUsd: formatValue(totalValue),
+        apyBase: calcApy(apy, blockTime, performanceMetrics),
+        underlyingTokens: fundComposition
+          .filter(({ amount }) => amount !== '0')
+          .map(({ tokenAddress }) => tokenAddress),
+        url: `${MSTABLE_VAULT_BASE_URL}${address}`,
+      })
+    );
+  } catch (error) {
+    console.error('Failed to fetch mStable pools', error);
+
+    return [];
+  }
+};
+
+module.exports = {
+  timetravel: false,
+  apy: poolsFunction,
+};