使用Observable进行AWS cognito回调 [英] Use Observable for AWS cognito callback

问题描述

如何将注册回调转换为Observable，符合Angular 2约定？这就是回调结构的样子

How can I turn the signup callback into an Observable, conforming to the Angular 2 convention? This is what the callback structure is like

userPool.signUp(this.artist.email, this.artist.password, attributeList, null, function(err, result) {
  if (err) {
    alert(err);
    return;
  }
  let cognitoUser = result.user;
  console.log(JSON.stringify(result));
  console.log('user name is ' + cognitoUser.getUsername());
});

推荐答案

有一个用于此目的的RxJS静态运算符： bindNodeCallback 。它会将一个Node风格的回调API转换为一个返回Observable的函数。

There is an RxJS static operator for just that purpose: bindNodeCallback. It will convert a Node-style callback API to a function that returns an Observable.

你可以这样使用它：

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/bindNodeCallback';

let signInAsObservable = Observable.bindNodeCallback(
  userPool.signUp.bind(userPool)
);
let observable = signInAsObservable(
  this.artist.email,
  this.artist.password,
  attributeList,
  null
);
observable.subscribe(
  result => {
    let cognitoUser = result.user;
    console.log(JSON.stringify(result));
    console.log('user name is ' + cognitoUser.getUsername());
  },
  error => alert(error)
);

请注意，您需要致电 bind 将 signUp 绑定到 userPool 。

Note that you will need to call bind to bind signUp to userPool.

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