otterscan/src/PriceBox.tsx

105 lines
3.3 KiB
TypeScript
Raw Normal View History

import React, { useState, useEffect, useMemo, useContext } from "react";
import { Contract } from "@ethersproject/contracts";
import { commify, formatUnits } from "@ethersproject/units";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { faGasPump } from "@fortawesome/free-solid-svg-icons/faGasPump";
import AggregatorV3Interface from "@chainlink/contracts/abi/v0.8/AggregatorV3Interface.json";
import { RuntimeContext } from "./useRuntime";
2021-07-13 21:55:32 +00:00
import { formatValue } from "./components/formatter";
import { useLatestBlock } from "./useLatestBlock";
const ETH_FEED_DECIMALS = 8;
const PriceBox: React.FC = () => {
const { provider } = useContext(RuntimeContext);
const latestBlock = useLatestBlock(provider);
const maybeOutdated: boolean =
latestBlock !== undefined &&
Date.now() / 1000 - latestBlock.timestamp > 3600;
const ethFeed = useMemo(
() =>
provider &&
new Contract("eth-usd.data.eth", AggregatorV3Interface, provider),
[provider]
);
const gasFeed = useMemo(
() =>
provider &&
new Contract("fast-gas-gwei.data.eth", AggregatorV3Interface, provider),
[provider]
);
const [latestPriceData, setLatestPriceData] = useState<any>();
const [latestGasData, setLatestGasData] = useState<any>();
useEffect(() => {
if (!ethFeed || !gasFeed) {
return;
}
const readData = async () => {
const [priceData, gasData] = await Promise.all([
ethFeed.latestRoundData(),
await gasFeed.latestRoundData(),
]);
setLatestPriceData(priceData);
setLatestGasData(gasData);
};
readData();
}, [ethFeed, gasFeed]);
const [latestPrice, latestPriceTimestamp] = useMemo(() => {
2021-07-13 21:55:32 +00:00
if (!latestPriceData) {
return [undefined, undefined];
}
const price = latestPriceData.answer.div(10 ** (ETH_FEED_DECIMALS - 2));
const formattedPrice = commify(formatUnits(price, 2));
2021-07-13 21:55:32 +00:00
const timestamp = new Date(latestPriceData.updatedAt * 1000);
return [formattedPrice, timestamp];
}, [latestPriceData]);
const [latestGasPrice, latestGasPriceTimestamp] = useMemo(() => {
2021-07-13 21:55:32 +00:00
if (!latestGasData) {
return [undefined, undefined];
2021-07-13 21:55:32 +00:00
}
const formattedGas = formatValue(latestGasData.answer, 9);
const timestamp = new Date(latestGasData.updatedAt * 1000);
return [formattedGas, timestamp];
2021-07-13 21:55:32 +00:00
}, [latestGasData]);
return (
<>
{latestPriceData && (
<div
className={`flex rounded-lg px-2 py-1 space-x-2 ${
maybeOutdated ? "bg-orange-200" : "bg-gray-100"
} font-sans text-xs text-gray-800`}
>
<span
title={`ETH/USD last updated at: ${latestPriceTimestamp?.toString()}`}
>
2021-07-13 21:55:32 +00:00
Eth: $<span className="font-balance">{latestPrice}</span>
</span>
{latestGasData && (
<>
<span>|</span>
<span
className="text-gray-400"
title={`Fast gas price last updated at: ${latestGasPriceTimestamp?.toString()}`}
>
<FontAwesomeIcon icon={faGasPump} size="1x" />
2021-07-13 21:55:32 +00:00
<span className="ml-1">{latestGasPrice} Gwei</span>
</span>
</>
)}
</div>
)}
</>
);
};
export default React.memo(PriceBox);