otterscan/src/usePriceOracle.ts

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import { useEffect, useMemo, useState } from "react";
import { JsonRpcProvider, BlockTag } from "@ethersproject/providers";
import { Contract } from "@ethersproject/contracts";
import { BigNumber } from "@ethersproject/bignumber";
import AggregatorV3Interface from "@chainlink/contracts/abi/v0.8/AggregatorV3Interface.json";
export const useETHUSDOracle = (
provider: JsonRpcProvider | undefined,
blockTag: BlockTag | undefined
) => {
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const blockTags = useMemo(() => [blockTag], [blockTag]);
const priceMap = useMultipleETHUSDOracle(provider, blockTags);
if (blockTag === undefined) {
return undefined;
}
return priceMap[blockTag];
};
export const useMultipleETHUSDOracle = (
provider: JsonRpcProvider | undefined,
blockTags: (BlockTag | undefined)[]
) => {
const ethFeed = useMemo(() => {
if (!provider || provider.network.chainId !== 1) {
return undefined;
}
try {
return new Contract("eth-usd.data.eth", AggregatorV3Interface, provider);
} catch (err) {
console.error(err);
return undefined;
}
}, [provider]);
const [latestPriceData, setLatestPriceData] = useState<
Record<BlockTag, BigNumber>
>({});
useEffect(() => {
if (!ethFeed) {
return;
}
const priceReaders: Promise<BigNumber | undefined>[] = [];
for (const blockTag of blockTags) {
priceReaders.push(
(async () => {
try {
const priceData = await ethFeed.latestRoundData({ blockTag });
return BigNumber.from(priceData.answer);
} catch (err) {
console.error(err);
return undefined;
}
})()
);
}
const readData = async () => {
const results = await Promise.all(priceReaders);
const priceMap: Record<BlockTag, BigNumber> = {};
for (let i = 0; i < blockTags.length; i++) {
const blockTag = blockTags[i];
const result = results[i];
if (blockTag === undefined || result === undefined) {
continue;
}
priceMap[blockTag] = result;
}
setLatestPriceData(priceMap);
};
readData();
}, [ethFeed, blockTags]);
return latestPriceData;
};