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Simplify SWR code

This commit is contained in:
Willian Mitsuda 2022-04-10 01:51:52 -03:00
parent e9907f5925
commit c2e9ad7bd8
1 changed files with 25 additions and 26 deletions
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51
src/usePriceOracle.ts
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@ -4,6 +4,7 @@ import { Contract } from "@ethersproject/contracts";
import { BigNumber } from "@ethersproject/bignumber";
import AggregatorV3Interface from "@chainlink/contracts/abi/v0.8/AggregatorV3Interface.json";
import FeedRegistryInterface from "@chainlink/contracts/abi/v0.8/FeedRegistryInterface.json";
import { Fetcher } from "swr";
import useSWRImmutable from "swr/immutable";
import { ChecksummedAddress } from "./types";
@ -13,10 +14,13 @@ const FEED_REGISTRY_MAINNET: ChecksummedAddress =
// The USD "token" address for Chainlink feed registry's purposes
const USD = "0x0000000000000000000000000000000000000348";
type FeedRegistryFetcherKey = [ChecksummedAddress, BlockTag];
type FeedRegistryFetcherData = [BigNumber | undefined, number | undefined];
const feedRegistryFetcherKey = (
tokenAddress: ChecksummedAddress,
blockTag: BlockTag | undefined
): [ChecksummedAddress, BlockTag] | null => {
): FeedRegistryFetcherKey | null => {
if (blockTag === undefined) {
return null;
}
@ -24,35 +28,30 @@ const feedRegistryFetcherKey = (
};
const feedRegistryFetcher =
(provider: JsonRpcProvider | undefined) =>
async (
tokenAddress: ChecksummedAddress,
blockTag: BlockTag
): Promise<[BigNumber | undefined, number | undefined]> => {
(
provider: JsonRpcProvider | undefined
): Fetcher<FeedRegistryFetcherData, FeedRegistryFetcherKey> =>
async (tokenAddress, blockTag) => {
// It work works on ethereum mainnet and kovan, see:
// https://docs.chain.link/docs/feed-registry/
if (!provider || provider.network.chainId !== 1) {
return [undefined, undefined];
if (provider!.network.chainId !== 1) {
throw new Error("FeedRegistry is supported only on mainnet");
}
try {
const feedRegistry = new Contract(
FEED_REGISTRY_MAINNET,
FeedRegistryInterface,
provider
);
const priceData = await feedRegistry.latestRoundData(tokenAddress, USD, {
blockTag,
});
const quote = BigNumber.from(priceData.answer);
const decimals = await feedRegistry.decimals(tokenAddress, USD, {
blockTag,
});
return [quote, decimals];
} catch (err) {
console.error(err);
return [undefined, undefined];
}
// Let SWR handle error
const feedRegistry = new Contract(
FEED_REGISTRY_MAINNET,
FeedRegistryInterface,
provider
);
const priceData = await feedRegistry.latestRoundData(tokenAddress, USD, {
blockTag,
});
const quote = BigNumber.from(priceData.answer);
const decimals = await feedRegistry.decimals(tokenAddress, USD, {
blockTag,
});
return [quote, decimals];
};
export const useTokenUSDOracle = (