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broadcastwriter.go
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/
broadcastwriter.go
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package broadcastwriter
import (
"bytes"
"encoding/json"
"io"
"sync"
"time"
"github.com/CliffYuan/docker1.2.0/pkg/jsonlog"
"github.com/CliffYuan/docker1.2.0/pkg/log"
)
// BroadcastWriter accumulate multiple io.WriteCloser by stream.
type BroadcastWriter struct {
sync.Mutex
buf *bytes.Buffer
streams map[string](map[io.WriteCloser]struct{})
}
// AddWriter adds new io.WriteCloser for stream.
// If stream is "", then all writes proceed as is. Otherwise every line from
// input will be packed to serialized jsonlog.JSONLog.
func (w *BroadcastWriter) AddWriter(writer io.WriteCloser, stream string) {
w.Lock()
if _, ok := w.streams[stream]; !ok {
w.streams[stream] = make(map[io.WriteCloser]struct{})
}
w.streams[stream][writer] = struct{}{}
w.Unlock()
}
// Write writes bytes to all writers. Failed writers will be evicted during
// this call.
func (w *BroadcastWriter) Write(p []byte) (n int, err error) {
created := time.Now().UTC()
w.Lock()
if writers, ok := w.streams[""]; ok {
for sw := range writers {
if n, err := sw.Write(p); err != nil || n != len(p) {
// On error, evict the writer
delete(writers, sw)
}
}
}
w.buf.Write(p)
for {
line, err := w.buf.ReadString('\n')
if err != nil {
w.buf.Write([]byte(line))
break
}
for stream, writers := range w.streams {
if stream == "" {
continue
}
b, err := json.Marshal(jsonlog.JSONLog{Log: line, Stream: stream, Created: created})
if err != nil {
log.Errorf("Error making JSON log line: %s", err)
continue
}
b = append(b, '\n')
for sw := range writers {
if _, err := sw.Write(b); err != nil {
delete(writers, sw)
}
}
}
}
w.Unlock()
return len(p), nil
}
// Clean closes and removes all writers. Last non-eol-terminated part of data
// will be saved.
func (w *BroadcastWriter) Clean() error {
w.Lock()
for _, writers := range w.streams {
for w := range writers {
w.Close()
}
}
w.streams = make(map[string](map[io.WriteCloser]struct{}))
w.Unlock()
return nil
}
func New() *BroadcastWriter {
return &BroadcastWriter{
streams: make(map[string](map[io.WriteCloser]struct{})),
buf: bytes.NewBuffer(nil),
}
}