lol-api-client/lib/web.js

A Node client for interfacing with the League of Legends API

'use strict'

const request = require('request')

// Instantiate a new Promise and pass the resolve/reject callbacks
// to the helper method below that handles recursive retries.
exports.makeRequest = function (url) {
  return new Promise((resolve, reject) => {
    recursiveRequest(url, resolve, reject)
  })
}

// Helper that will recursively retry if the response from Riot's API
// tells us that we've exceeded the rate limit for the user's API key.
// This is sort of hacky and passing around the resolve/reject callbacks
// seems like bad convention - this was just difficult to implement a
// retry loop within a promise.
function recursiveRequest (url, resolve, reject) {
  request(url, (error, response, body) => {
    if (!error && response.statusCode === 200) {
      resolve(JSON.parse(body))
    } else if (response.statusCode === 429) {
      const delay = (parseInt(response.headers['retry-after'], 2) + 3) * 1000
      setTimeout(recursiveRequest, delay, url, resolve, reject)
    } else {
      reject(response)
    }
  })
}