Add koalaswap adapter

src/adaptors/koalaswap/index.js

@@ -0,0 +1,153 @@
+const { ethers } = require('ethers')
+const BigNumber = require('bignumber.js')
+const utils = require('../utils')
+
+const chain = 'unit0'
+
+const config = {
+  factory: '0xcF3Ee60d29531B668Ae89FD3577E210082Da220b',
+  fromBlock: 2291892,
+  blockTime: 2,
+  uiBase: 'https://koalaswap.app',
+  rpc: 'https://rpc.unit0.dev',
+}
+
+const provider = new ethers.providers.JsonRpcProvider(config.rpc)
+
+const factoryIface = new ethers.utils.Interface([
+  'event PoolCreated(address indexed token0, address indexed token1, uint24 indexed fee, int24 tickSpacing, address pool)',
+])
+
+const poolIface = new ethers.utils.Interface([
+  'event Swap(address indexed sender, address indexed recipient, int256 amount0, int256 amount1, uint160 sqrtPriceX96, uint128 liquidity, int24 tick)',
+])
+
+const erc20Abi = [
+  'function balanceOf(address) view returns (uint256)',
+  'function decimals() view returns (uint8)',
+  'function symbol() view returns (string)',
+]
+
+async function getTokenInfo(token, poolAddress) {
+  const c = new ethers.Contract(token, erc20Abi, provider)
+  let balance = '0',
+    decimals = 18,
+    symbol = token.slice(0, 6)
+
+  try {
+    balance = (await c.balanceOf(poolAddress)).toString()
+  } catch (_) {}
+  try {
+    decimals = await c.decimals()
+  } catch (_) {}
+  try {
+    symbol = await c.symbol()
+  } catch (_) {}
+
+  return { balance, decimals, symbol }
+}
+
+async function getPools() {
+  const logs = await provider.getLogs({
+    address: config.factory,
+    fromBlock: config.fromBlock,
+    toBlock: 'latest',
+    topics: [factoryIface.getEventTopic('PoolCreated')],
+  })
+
+  const pools = logs.map((log) => {
+    const parsed = factoryIface.parseLog(log)
+    return {
+      token0: parsed.args.token0,
+      token1: parsed.args.token1,
+      fee: parsed.args.fee,
+      pool: parsed.args.pool,
+    }
+  })
+
+  const dataPools = []
+
+  for (const p of pools) {
+    const [t0, t1] = await Promise.all([
+      getTokenInfo(p.token0, p.pool),
+      getTokenInfo(p.token1, p.pool),
+    ])
+
+    const prices = await utils.getPrices([p.token0, p.token1], chain)
+    const price0 = prices.pricesByAddress[p.token0.toLowerCase()] || 1
+    const price1 = prices.pricesByAddress[p.token1.toLowerCase()] || 1
+
+    const tvl0 = new BigNumber(t0.balance)
+      .div(`1e${t0.decimals}`)
+      .times(price0)
+    const tvl1 = new BigNumber(t1.balance)
+      .div(`1e${t1.decimals}`)
+      .times(price1)
+    const tvl = tvl0.plus(tvl1)
+
+    let totalFee0 = 0n
+    let totalFee1 = 0n
+    try {
+      const currentBlock = await provider.getBlockNumber()
+      const fromBlock = Math.max(
+        currentBlock - Math.floor((24 * 3600) / config.blockTime),
+        config.fromBlock,
+      )
+
+      const swapLogs = await provider.getLogs({
+        address: p.pool,
+        fromBlock,
+        toBlock: currentBlock,
+        topics: [poolIface.getEventTopic('Swap')],
+      })
+
+      for (const log of swapLogs) {
+        const args = poolIface.parseLog(log).args
+        const amt0 = BigInt(args.amount0.toString())
+        const amt1 = BigInt(args.amount1.toString())
+        if (amt0 > 0n) totalFee0 += (amt0 * BigInt(p.fee)) / 1000000n
+        if (amt1 > 0n) totalFee1 += (amt1 * BigInt(p.fee)) / 1000000n
+      }
+    } catch (_) {}
+
+    const feeValue0 = new BigNumber(totalFee0.toString())
+      .div(`1e${t0.decimals}`)
+      .times(price0)
+    const feeValue1 = new BigNumber(totalFee1.toString())
+      .div(`1e${t1.decimals}`)
+      .times(price1)
+    const feeUsd = feeValue0.plus(feeValue1)
+
+    const aprBn = tvl.gt(0) ? feeUsd.div(tvl).times(36500) : new BigNumber(0)
+    const apy = utils.aprToApy(aprBn.toNumber())
+
+    const feeTier = Number(p.fee) / 1_000_000
+    const feeUsdNum = isFinite(feeUsd.toNumber()) ? feeUsd.toNumber() : 0
+    const volumeUsd1d = feeTier > 0 ? feeUsdNum / feeTier : 0
+
+    dataPools.push({
+      pool: p.pool,
+      chain,
+      project: 'koalaswap',
+      symbol: `${t0.symbol}-${t1.symbol}`,
+      poolMeta: `${Number(p.fee) / 1e4}%`,
+      tvlUsd: tvl.toNumber(),
+      apyBase: apy,
+      underlyingTokens: [p.token0, p.token1],
+      url: `${config.uiBase}/pools/${p.pool}`,
+      volumeUsd1d,
+    })
+  }
+
+  return dataPools
+}
+
+async function main() {
+  const data = await getPools()
+  return data.filter((p) => utils.keepFinite(p))
+}
+
+module.exports = {
+  timetravel: false,
+  apy: main,
+}