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Clone reader with pipe + tee
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| package main | |
| import ( | |
| "bytes" | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "sync" | |
| ) | |
| func main() { | |
| r1 := bytes.NewBuffer([]byte("my data")) | |
| pr, pw := io.Pipe() | |
| tr := io.TeeReader(r1, pw) | |
| var d1, d2 []byte | |
| wg := new(sync.WaitGroup) | |
| wg.Add(1) | |
| // pick up the secondary stream in an independent go routine | |
| go func() { | |
| var err error | |
| defer func() { | |
| pw.Close() | |
| wg.Done() | |
| }() | |
| d2, err = ioutil.ReadAll(tr) | |
| if err != nil { | |
| panic(err) | |
| } | |
| }() | |
| // a read that would happen, possibly outside of our control | |
| var err error | |
| d1, err = ioutil.ReadAll(pr) | |
| if err != nil { | |
| panic(err) | |
| } | |
| wg.Wait() | |
| fmt.Printf("d1=%s, d2=%s\n", d1, d2) | |
| } |
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