saepenatus/packages/gas/src/stream.ts

Web3-Onboard makes it simple to connect Ethereum hardware and software wallets to your dapp. Features standardised spec compliant web3 providers for all supported wallets, framework agnostic modern javascript UI with code splitting, CSS customization, mul

import { Observable, timer, zip } from 'rxjs'
import { switchMap } from 'rxjs/operators'
import { ajax } from 'rxjs/ajax'
import { getRequestUrl } from './utils.js'
import { StreamOptions, GasPlatformResponse } from './types.js'
import { validateRequest } from './validation.js'

function stream(options: StreamOptions): Observable<GasPlatformResponse[]> {
  const invalid = validateRequest(options)

  if (invalid) {
    throw invalid
  }

  const { chains, endpoint, apiKey, poll = 5000 } = options

  const requestUrls = chains.map(chainId =>
    getRequestUrl({ chainId, apiKey, endpoint })
  )

  // start polling
  return timer(0, poll).pipe(
    switchMap(() =>
      // combine results of all chains request in to one stream emission
      zip(
        requestUrls.map(({ url, headers }) =>
          ajax.getJSON<GasPlatformResponse>(url, headers)
        )
      )
    )
  )
}

export default stream