lijunyong / go-notes

go基础笔记

go-notes

go基础笔记

module lookup disabled by -mod=vendor

#在对go mod项目执行go build的报错，可以通过：
export GOFLAGS=""
go build

rm -rf 删除GOPATH下目录报Permission denied

https://github.com/golang/go/issues/27161
go clean -modcache

go context

func main()  {
	ctx, cancel := context.WithCancel(context.Background())
	go go1(ctx)
	time.Sleep(5 * time.Second)
	cancel()
	time.Sleep(5 * time.Second)
	fmt.Println("main done")
}

func go1(ctx context.Context)  {
	c, cancel := context.WithTimeout(ctx, 1 * time.Second)
	defer cancel()
	go go2(c)
	for{
		select {
		case <- ctx.Done():
			fmt.Println("ctx go1 done")
			return
		case <-time.After(500 * time.Millisecond):
			fmt.Println("go1")
		}
	}
}

func go2(ctx context.Context)  {
	for{
		select {
		case <-ctx.Done():
			fmt.Println("ctx go2 done")
			return
		case <-time.After(500 * time.Millisecond):
			fmt.Println("go2")
		}
	}
}

go get指定版本不会安装

go get 没用，因为 main 包不在项目根目录。如果需要手动安装，可以按照以下方式：

git clone https://github.com/caixw/gobuild.git
cd gobuild/cmd/gobuild
go install