DyDx TVL translation

projects/dydx/index.js

@@ -0,0 +1,77 @@
+/*==================================================
+  Modules
+==================================================*/
+
+  const sdk = require('../../sdk');
+  const _ = require('underscore');
+  const BigNumber = require("bignumber.js");
+
+/*==================================================
+    Settings
+ ==================================================*/
+
+  const contracts = [
+    '0x5199071825CC1d6cd019B0D7D42B08106f6CF16D',
+    '0x1e0447b19bb6ecfdae1e4ae1694b0c3659614e4e'
+  ];
+
+  const tokens = [
+    '0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359',
+    '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2',
+    '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
+    '0x6B175474E89094C44Da98b954EedeAC495271d0F'
+  ];
+
+/*==================================================
+  Main
+==================================================*/
+
+  async function tvl (timestamp, block) {
+    const balances = {};
+
+    let balanceOfCalls = [];
+    _.forEach(contracts, (contract) => {
+      balanceOfCalls = [
+        ...balanceOfCalls,
+        ..._.map(tokens, (token) => ({
+          target: token,
+          params: contract
+        }))
+      ];
+    });
+
+    const balanceOfResult = (await sdk.api.abi.multiCall({
+      block,
+      calls: balanceOfCalls,
+      abi: 'erc20:balanceOf',
+    })).output;
+
+    /* combine token volumes on multiple contracts */
+    _.forEach(balanceOfResult, (result) => {
+      let balance = new BigNumber(result.output || 0);
+      if (balance <= 0) return;
+
+      let asset = result.input.target;
+      let total = balances[asset];
+
+      if (total) {
+        balances[asset] = balance.plus(total).toFixed();
+      } else {
+        balances[asset] = balance.toFixed();
+      }
+    });
+
+    return balances;
+  }
+
+/*==================================================
+  Exports
+==================================================*/
+
+  module.exports = {
+    name: 'dYdX',
+    token: null,
+    category: 'Lending',
+    start: 1538179200,  // 09/29/2018 @ 12:00am (UTC)
+    tvl,
+  };