➡ Using PriceFeed
Sentio supports a limited set of price feed, it can be accessed by a combination of
- Chain network ID
- Token Address
- Timestamp
let price : any
try {
price = await getPriceByType(CHAIN_IDS.ETHEREUM, TOKEN_ARRAY[i], ctx.timestamp)
} catch (error) {
if (error instanceof ClientError && error.code === Status.NOT_FOUND) {
continue
}
throw error
}
Putting all together to compute TVL
async function getTokenDetails(ctx: ExchangeV3Context, address: string): Promise<[token.TokenInfo, bigint]> {
const tokenInfo = await getTokenInfo(address)
let amount: bigint
if (tokenInfo.symbol === "ETH") {
try {
amount = await ctx.contract.provider.getBalance("0x674bdf20a0f284d710bc40872100128e2d66bd3f")
} catch (e) {
console.log(e)
amount = 0n
}
} else {
try {
amount = await getERC20Contract(address).balanceOf("0x674bdf20a0f284d710bc40872100128e2d66bd3f",
{blockTag: Number(ctx.blockNumber)})
} catch (e) {
console.log("error", e)
amount = 0n
}
}
return [tokenInfo, amount]
}
const tvl = async function (_: any, ctx: ExchangeV3Context) {
console.log("new round of tvl")
for (let i = 0; i < TOKEN_ARRAY.length; i++) {
const [tokenInfo, amount] = await getTokenDetails(ctx, TOKEN_ARRAY[i])
const scaledAmount = amount.scaleDown(tokenInfo.decimal)
let price : any
try {
price = await getPriceByType("ethereum_mainnet", TOKEN_ARRAY[i], ctx.timestamp)
} catch (error) {
if (error instanceof ClientError && error.code === Status.NOT_FOUND) {
continue
}
throw error
}
ctx.meter.Gauge("tvl").record(scaledAmount.multipliedBy(price),
{token: tokenInfo.symbol, address: TOKEN_ARRAY[i]})
}
}
ExchangeV3Processor.bind({address: LOOPRING_EXCHANGE})
.onTimeInterval(tvl, 60, 24 * 60 * 30)
For more information regarding price feed, please refer to price-feed
Updated 3 months ago