Example TypeScript web3.js with retry fetcher

web3js-typescript-retry-fetcher.ts

import * as nodeFetch from 'node-fetch';
import fetch from 'fetch-retry'
import https from 'https';

const _fetch = fetch(nodeFetch.default);
type FetchFn = typeof nodeFetch.default;
export type Fetcher = (...args: Parameters<FetchFn>) => ReturnType<FetchFn>;
export type FetcherWithCustomAgent = (agent: https.Agent) => Fetcher;
export const RetryFetcher: Fetcher = (...args) => {
    const [url, init] = args;
    return _fetch(url, {
        ...init,
        retries: 3,
        retryDelay: 1000,
        // eslint-disable-next-line @typescript-eslint/require-await
        retryOn: async function (attempt, error, response) {
            if (attempt > 3) return false;
            if (response?.status === 429) {
                return false;
            }
            if (error) {
                return true;
            }
            return false;
        }
    });
}
export const FetcherWithCustomAgent: FetcherWithCustomAgent = (agent: https.Agent) => {
    const fetcher: Fetcher = (...args) => {
        const [url, init] = args;
        return RetryFetcher(url, {
            ...init,
            agent
        })
    }
    return fetcher;
}



// example for web3.js

const web3Agent = new https.Agent({
    keepAlive: true,
    keepAliveMsecs: 60000,
})

const connection = new Connection(
    "https://my_sol_endpoint_URL",
    {
        httpAgent: web3Agent,
        ...restofRPCsettings,
        fetch: RetryFetcher,
    },
);

const jupiterAgent = new https.Agent({
    keepAlive: true,
    keepAliveMsecs: 60000,
})

// example for jupiter v6 client:
export const jupiterOfficial = createJupiterApiClient({
    fetchApi: FetcherWithCustomAgent(jupiterAgent),
});