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