/
stream_logger.go
71 lines (59 loc) · 1.98 KB
/
stream_logger.go
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package main
import (
"io"
"time"
)
type StreamLoggerConfig struct {
Src io.ReadWriter // Actual IO stream that gets logged
Dest io.Writer // The destination io.Writer
TimeFormat string // Time Format string to include a timestamp immediately before every Read() and Write() from Src
ReadPrefix []byte // Slice of bytes that gets written to Dest immediately before every Read() from Src
ReadSuffix []byte // Slice of bytes that gets written to Dest immediately after every Read() from Src
WritePrefix []byte // Slice of bytes that gets written to Dest immediately before every Write() to Src
WriteSuffix []byte // Slice of bytes that gets written to Dest immediately after every Write() to Src
}
// Logs all reads and writes on a source io.ReadWriter by writing it to a destination io.Writer.
type StreamLogger struct {
Config *StreamLoggerConfig
}
func NewStreamLogger(c *StreamLoggerConfig) *StreamLogger {
// TimeFormat: "2006-01-02T15:04:05.000000",
// Config.Src: Config.Src,
// Config.Dest: Config.Dest,
return &StreamLogger{
Config: c,
}
}
func (l *StreamLogger) Read(p []byte) (n int, err error) {
n, err = l.Config.Src.Read(p)
if n > 0 {
if len(l.Config.ReadPrefix) > 0 {
l.Config.Dest.Write([]byte(time.Now().Format(l.Config.TimeFormat)))
l.Config.Dest.Write(l.Config.ReadPrefix)
}
if n, err := l.Config.Dest.Write(p[:n]); err != nil {
return n, err
}
l.Config.Dest.Write(l.Config.ReadSuffix)
}
return
}
func (l *StreamLogger) Write(p []byte) (n int, err error) {
if len(p) <= 0 {
return
}
if _, err := l.Config.Dest.Write([]byte(time.Now().Format(l.Config.TimeFormat))); err != nil {
return 0, err
}
if _, err := l.Config.Dest.Write(l.Config.WritePrefix); err != nil {
return 0, err
}
n, err = io.MultiWriter(l.Config.Src, l.Config.Dest).Write(p)
if err != nil {
return n, err
}
if _, err := l.Config.Dest.Write(l.Config.WriteSuffix); err != nil {
return n, err
}
return n, nil
}