A wrapper of real JSON RPC provider

fake-provider.ts

import { ethers } from 'ethers';
import { TillSuccess } from 'noqueue';

// Let's consider this is a dirty trick, to force the JSON RPC
// to retries several times before give up
function getFakeProvider(
  provider: ethers.providers.StaticJsonRpcProvider,
): ethers.providers.StaticJsonRpcProvider {
  const fakeProvider = {};
  const injected: string[] = [];
  for (let k in provider) {
    // Inject public methods
    if (typeof provider[k] === 'function' && !k.startsWith('_')) {
      injected.push(k);
      fakeProvider[k] = (...args: any[]) => {
        console.log(`Injected ${k}() ha ha`);
        // Retries 3 times every 3 secs
        return TillSuccess(async () => provider[k](...args), 3000, 3);
      };
    }
  }
  return new Proxy(provider, {
    get(target, p, receiver) {
      if (injected.includes(p as string)) {
        return Reflect.get(fakeProvider, p, target);
      }
      return Reflect.get(target, p, receiver);
    },
  });
}

(async () => {
  let provider = new ethers.providers.StaticJsonRpcProvider(
    'https://bsc-dataseed.binance.org/',
  );

  let faker = getFakeProvider(provider);

  console.log(await faker.getBlock('latest'));
  console.log(faker._isProvider);
})();