Go Standard Library Cookbook

How to do it...

1. Open the console and create the folder chapter10/recipe06.
2. Navigate to the directory.
3. Create the file first.go with following content:

        package main        import (          "context"          "fmt"          "sync"          "time"        )        type SearchSrc struct {          ID string          Delay int        }        func (s *SearchSrc) Search(ctx context.Context) <-chan string {          out := make(chan string)          go func() {            time.Sleep(time.Duration(s.Delay) * time.Second)            select {              case out <- "Result " + s.ID:              case <-ctx.Done():              fmt.Println("Search received Done()")            }            close(out)            fmt.Println("Search finished for ID: " + s.ID)          }()          return out        }        func main() {          ctx, cancel := context.WithCancel(context.Background())          src1 := &SearchSrc{"1", 2}          src2 := &SearchSrc{"2", 6}          r1 := src1.Search(ctx)          r2 := src2.Search(ctx)