[英]Better error handling with Promises?
I am currently experimenting Google Firebase functions to access Google APIs. 我目前正在尝试使用Google Firebase函数来访问Google API。 It's running fine, but I am a little bit lost in trying to manage the errors that could be detected ...
它运行良好,但是我在尝试管理可以检测到的错误时有点迷路了...
In the .HTTPS getGoogleUsers
functions , I would like to return an HTTP status code ( 200 or error code ) , and the data ( or error message ) 在
.HTTPS getGoogleUsers
函数中,我想返回一个HTTP状态代码(200或错误代码)和数据(或错误消息)
As far as I can see , I can get errors: 据我所见,我会得到错误:
from the connect()
function ( 500: Internal server error or 401 Unauthorized ) 从
connect()
函数(500:内部服务器错误或401未经授权)
from the listUsers()
function ( 500: Internal server error or 400 Bad Request ) 从
listUsers()
函数(500:内部服务器错误或400错误的请求)
Am I totally or partially wrong ? 我是全部还是部分错误? what should be my strategy in this case ?
在这种情况下,我应该采取什么策略? thanks for feedback ..
感谢您的反馈..
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
const {google} = require('googleapis');
const KEY = require('./service-key.json');
// Create JSON Web Token Client
function connect () {
return new Promise((resolve, reject) => {
const jwtClient = new google.auth.JWT(
KEY.client_email,
null,
KEY.private_key,
['https://www.googleapis.com/auth/admin.directory.user'],
'adminuser@mydomain.com'
);
jwtClient.authorize((err) => {
if(err) {
reject(err);
} else {
resolve(jwtClient);
}
});
});
}
function listUsers (client) {
return new Promise((resolve, reject) => {
google.admin('directory_v1').users.list({
auth: client,
domain: 'mydomain.com',
}, (err, response) => {
if (err) {
reject(err);
}
resolve(response.data.users);
});
});
}
function getAllUsers () {
connect()
.then(client => {
return listUsers(client);
})
.catch(error => {
return error;
})
}
exports.getGoogleUsers = functions.https.onRequest((req, res) => {
const users = getAllUsers();
if (error) {
status = error.status;
data = error.message;
} else {
status = 200;
data = users;
}
res.send({ status: status, datas: data })
});
I think you are looking for 我想你在找
function getAllUsers () {
return connect().then(listUsers);
//^^^^^^
}
exports.getGoogleUsers = functions.https.onRequest((req, res) => {
getAllUsers().then(users => {
return {status: 200, datas: users};
}, error => {
return {status: error.status, datas: error.message};
}).then(response => {
res.send(response);
});
});
This uses the .then(…, …)
method with two callbacks to distinguish between success and error case, and to wait for the result of the promise. 它使用
.then(…, …)
方法和两个回调来区分成功和错误情况,并等待promise的结果。
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