DEV Community

loading...

Golang Context Cancelled On Goroutine

clavinjune profile image Clavin June Originally published at clavinjune.dev on ・1 min read

Golang’s request context is automatically be done when passed on goroutine, and its parents goroutine is already done.

package main

import (
    "context"
    "log"
    "net/http"
    "time"
)

func foo(ctx context.Context) {
    ctx, cancel := context.WithTimeout(ctx, 60*time.Second)
    defer cancel()

    req, _ := http.NewRequestWithContext(ctx,
        http.MethodGet, "https://google.com", nil)

    _, err := http.DefaultClient.Do(req)

    log.Println(err) // Get "https://google.com": context canceled
}

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        go foo(r.Context())
    }) // context will be done when it reaches here

    http.ListenAndServe(":8888", nil)
}

Enter fullscreen mode Exit fullscreen mode

Discussion (0)

pic
Editor guide