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package broadcaster // import "github.com/docker/docker/pkg/broadcaster"
import (
"io"
"sync"
)
// Unbuffered accumulates multiple io.WriteCloser by stream.
type Unbuffered struct {
mu sync.Mutex
writers []io.WriteCloser
}
// Add adds new io.WriteCloser.
func (w *Unbuffered) Add(writer io.WriteCloser) {
w.mu.Lock()
w.writers = append(w.writers, writer)
w.mu.Unlock()
}
// Write writes bytes to all writers. Failed writers will be evicted during
// this call.
func (w *Unbuffered) Write(p []byte) (n int, err error) {
w.mu.Lock()
var evict []int
for i, sw := range w.writers {
if n, err := sw.Write(p); err != nil || n != len(p) {
// On error, evict the writer
evict = append(evict, i)
}
}
for n, i := range evict {
w.writers = append(w.writers[:i-n], w.writers[i-n+1:]...)
}
w.mu.Unlock()
return len(p), nil
}
// Clean closes and removes all writers. Last non-eol-terminated part of data
// will be saved.
func (w *Unbuffered) Clean() error {
w.mu.Lock()
for _, sw := range w.writers {
sw.Close()
}
w.writers = nil
w.mu.Unlock()
return nil
}
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