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63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package jsonfilelog
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import (
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"bytes"
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"os"
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"sync"
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"github.com/docker/docker/daemon/logger"
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"github.com/docker/docker/pkg/jsonlog"
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"github.com/docker/docker/pkg/timeutils"
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)
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// JSONFileLogger is Logger implementation for default docker logging:
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// JSON objects to file
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type JSONFileLogger struct {
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buf *bytes.Buffer
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f *os.File // store for closing
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mu sync.Mutex // protects buffer
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}
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// New creates new JSONFileLogger which writes to filename
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func New(filename string) (logger.Logger, error) {
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log, err := os.OpenFile(filename, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0600)
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if err != nil {
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return nil, err
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}
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return &JSONFileLogger{
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f: log,
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buf: bytes.NewBuffer(nil),
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}, nil
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}
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// Log converts logger.Message to jsonlog.JSONLog and serializes it to file
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func (l *JSONFileLogger) Log(msg *logger.Message) error {
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l.mu.Lock()
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defer l.mu.Unlock()
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timestamp, err := timeutils.FastMarshalJSON(msg.Timestamp)
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if err != nil {
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return err
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}
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err = (&jsonlog.JSONLogBytes{Log: append(msg.Line, '\n'), Stream: msg.Source, Created: timestamp}).MarshalJSONBuf(l.buf)
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if err != nil {
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return err
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}
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l.buf.WriteByte('\n')
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_, err = l.buf.WriteTo(l.f)
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if err != nil {
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// this buffer is screwed, replace it with another to avoid races
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l.buf = bytes.NewBuffer(nil)
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return err
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}
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return nil
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}
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// Close closes underlying file
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func (l *JSONFileLogger) Close() error {
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return l.f.Close()
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}
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// Name returns name of this logger
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func (l *JSONFileLogger) Name() string {
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return "JSONFile"
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}
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