how to support timeout ?

[miaozilong]

your example is get ip from the remote
but if my network is poor that it'll last long time
i wanna to reject after 3 second if the ip does't get

[miaozilong]

i solved the problem !

package main

import (
	"errors"
	"fmt"
	"github.com/chebyrash/promise"
	"io/ioutil"
	"net/http"
	"time"
)

func main() {
	var requestPromise = promise.New(func(resolve func(interface{}), reject func(error)) {
		go func() {
			time.Sleep(2 * time.Second)
			reject(errors.New("time out error"))
		}()
		resp, err := http.Get("https://httpbin.org/ip")
		defer resp.Body.Close()
		if err != nil {
			reject(err)
			return
		}
		body, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			reject(err)
			return
		}
		resolve(body)
	})

	// Parse JSON body in async manner
	parsed, err := requestPromise.Await()

	if err != nil {
		fmt.Printf("Error: %s\n", err.Error())
		return
	}
	ip := fmt.Sprintf("%s", parsed)

	fmt.Println(ip)
}

[chebyrash]

Hi,

Have a look at https://golang.org/pkg/net/http/#Client
The easiest way is to use is the Timeout field of http.Client

c := &http.Client{
    Timeout: 15 * time.Second,
}
resp, err := c.Get("https://httpbin.org/ip")

Or you can use

go func() {
    time.Sleep(2 * time.Second)
    reject(errors.New("time out error"))
}()

[miaozilong]

i want to use
promise.Wait(2*time.Second)
how to solve it it's more useful

[miaozilong]

parsed, err := requestPromise.Await( 2 * time.Second )

how to use like this?