First, if the request is not a member timeout:
var http = require('http');
var url = require('url');
function get(addr) {
return new Promise(function(resolve, reject) {
var url_obj = url.parse(addr);
was options = {
hostname: url_obj.hostname,
path: url_obj.path,
method: 'GET'
};
var req = http.request(options, function(res) {
res.setEncoding ( 'utf8');
, data = '';
res.on('data', function (chunk) {
data += chunk;
});
res.on('end', function () {
data = JSON.parse(data);
resolve(data);
});
});
req.on('error', function(e) {
reject (e)
});
req.end();
});
}
get('http://demos.so/result/homework.promise.userInfo').then(function (args) {
return Promise.all([get('http://demos.so/result/userid=' + args['_id']), get('http://demos.so/result/student=' + args['_id'])]);
}).then(function (args) {
console.log(args);
}).catch(function(err){
console.log(err);
});
Look again at the code to overtime:
var http = require('http');
var url = require('url');
function delayPromise(ms) {
return new Promise(function (resolve) {
setTimeout(resolve, ms);
});
}
function timeoutPromise(promise, ms) {
var timeout = delayPromise(ms).then(function () {
throw new Error('Operation timed out after ' + ms + ' ms');
});
return Promise.race([promise, timeout]);
}
function get(addr) {
return new Promise(function(resolve, reject) {
var url_obj = url.parse(addr);
was options = {
hostname: url_obj.hostname,
path: url_obj.path,
method: 'GET'
};
var req = http.request(options, function(res) {
res.setEncoding ( 'utf8');
, data = '';
res.on('data', function (chunk) {
data += chunk;
});
res.on('end', function () {
data = JSON.parse(data);
resolve(data);
});
});
req.on('error', function(e) {
reject (e)
});
req.end();
});
}
timeoutPromise(get('http://demos.so/result/homework.promise.userInfo'),1000).catch(function (err) {
console.log(err);
}).then(function (args) {
return Promise.all([timeoutPromise(get('http://demos.so/result/userid=' + args['_id']), 1000), timeoutPromise(get('http://demos.so/result/student=' + args['_id']), 1000)]);
}).then(function (args) {
console.log(args);
}).catch(function (err) {
console.log(err);
});
Principle is very simple, is to use Promise.race, we first create a Promise, which is treated with setTimeout, then Promise Promise newly created and we used before "game" look.