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  1. class TokenStorage {
  2.   initialize(token) {
  3.     this._token = null
  4.   }
  5.  
  6.   async getStoredToken() {
  7.     return this._token ? this._token : await this.refreshToken();
  8.   }
  9.  
  10.   async refreshToken() {
  11.     this._token = await fetchTokenSomehow();
  12.     return this._token;
  13.   }
  14. }
  15.  
  16. let tokenStorage = new TokenStorage();
  17.  
  18. async function poll() {
  19.   let response = await tokenStorage.getStoredToken().then(fetchResponse);
  20.  
  21.   if (isTokenExpired(response)) {
  22.     response = await tokenStorage.refreshToken().then(fetchResponse)
  23.   }
  24.  
  25.   if (response.ok) {
  26.     let result = response.json.result;
  27.     if (result && result !== 'reinit-required') processData(result);
  28.  
  29.     setTimeout(poll, 0);
  30.   } else {
  31.     setTimeout(poll, 1000);
  32.   }
  33. }
  34.  
  35. async function fetchResponse(token) {
  36.   try {
  37.     let response = await fetch(`http://127.0.0.1:8000/delta?token=${token}`);
  38.     let json = await response.json();
  39.  
  40.     return { ok: response.ok, json, status: response.status };
  41.   } catch(e) {
  42.     return { ok: false, error: e };
  43.   }
  44. }
  45.  
  46. async function fetchTokenSomehow() {
  47.   // ...
  48. }
  49.  
  50. function processData(result) {
  51.   // ...
  52. }
  53.  
  54. function isTokenExpired(response) {
  55.   // ...
  56. }
Success #stdin #stdout 0.03s 16640KB
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https://ideone.com/e2z3ld
language:
JavaScript (SMonkey 60.2.3)
created:
3 years ago
visibility:
public

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