ethena switch to 8h reward calculation

src/adaptors/ethena/index.js

@@ -5,15 +5,6 @@ const utils = require('../utils');
 const USDe = '0x4c9edd5852cd905f086c759e8383e09bff1e68b3';
 const sUSDe = '0x9D39A5DE30e57443BfF2A8307A4256c8797A3497';
 
-const getWeekNb = (timestamp) => {
-  const date = new Date(timestamp * 1000);
-  const startOfYear = new Date(date.getFullYear(), 0, 1);
-  const pastDaysOfYear = (date - startOfYear) / 86400000;
-  const weekNumber = Math.ceil((pastDaysOfYear + startOfYear.getDay() + 1) / 7);
-
-  return weekNumber;
-};
-
 const apy = async () => {
   const totalSupply =
     (
@@ -30,22 +21,11 @@ const apy = async () => {
 
   const tvlUsd = totalSupply * price;
 
-  // for apr, fetch rewards received from logs
-  // rewards are currently emitted weekly on thursday (though sometimes there are multiple tx within the same
-  // week)
-
-  // grab the last 7days of rewards
   const currentBlock = await sdk.api.util.getLatestBlock('ethereum');
   const toBlock = currentBlock.number;
-  const secondsInWeek = 7 * 60 * 60 * 24;
-  const timestampWeekAgo = currentBlock.timestamp - secondsInWeek;
-  const [fromBlock] = await utils.getBlocksByTime(
-    [timestampWeekAgo],
-    'ethereum'
-  );
   const topic =
     '0xbb28dd7cd6be6f61828ea9158a04c5182c716a946a6d2f31f4864edb87471aa6';
-  let logs = (
+  const logs = (
     await sdk.api.util.getLogs({
       target: '0x9D39A5DE30e57443BfF2A8307A4256c8797A3497',
       topic: '',
@@ -56,30 +36,10 @@ const apy = async () => {
       chain: 'ethereum',
     })
   ).output.sort((a, b) => b.blockNumber - a.blockNumber);
-  // get the timestamp
-  logs = await Promise.all(
-    logs.map(async (i) => ({
-      ...i,
-      timestamp: await sdk.api.util.getTimestamp(i.blockNumber),
-    }))
-  );
-
-  // extract the week
-  logs = logs.map((i) => ({ ...i, week: getWeekNb(i.timestamp) }));
-  // note: ethena changed the frequeny of rewards being send to the contract
-  // from weekly to every ~8h breaking the current calculation here.
-  // for now i'll default to using the previous weeks rewards (as these are complete).
-  // once enough
-  const previousWeek = [...new Set(logs.map((i) => i.week))].sort(
-    (a, b) => b - a
-  )[1];
-  const rewardsReceived = logs.filter((i) => i.week === previousWeek);
-  const rewardsReceivedSum = rewardsReceived.reduce(
-    (acc, i) => acc + parseInt(i.data / 1e18),
-    0
-  );
 
-  const aprBase = (rewardsReceivedSum / tvlUsd) * 52 * 100;
+  // rewards are now beeing streamed every 8hours, which we scale up to a year
+  const rewardsReceived = parseInt(logs[0].data / 1e18);
+  const aprBase = ((rewardsReceived * 3 * 365) / tvlUsd) * 100;
   // weekly compoounding
   const apyBase = utils.aprToApy(aprBase, 52);
   return [