/
file.go
82 lines (74 loc) · 1.87 KB
/
file.go
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package logger
import (
"fmt"
"io"
"os"
"path/filepath"
"github.com/brimdata/zed/pkg/fs"
"go.uber.org/zap/zapcore"
"gopkg.in/natefinch/lumberjack.v2"
)
type FileMode string
func (m *FileMode) Set(s string) error {
switch FileMode(s) {
case FileModeAppend, "":
*m = FileModeAppend
case FileModeTruncate:
*m = FileModeTruncate
case FileModeRotate:
*m = FileModeRotate
default:
if s == "" {
*m = FileModeTruncate
break
}
return fmt.Errorf("invalid FileMode type: %s", s)
}
return nil
}
func (m FileMode) String() string {
return string(m)
}
const (
// FileModeAppend will append to existing log files between restarts.
// This is the default option.
FileModeAppend FileMode = "append"
// FileModeTruncate will truncate onto existing log files in between
// restarts.
FileModeTruncate FileMode = "truncate"
// FileModeRotate will enable log rotation for log files.
FileModeRotate FileMode = "rotate"
)
func OpenFile(path string, mode FileMode) (zapcore.WriteSyncer, error) {
switch path {
case "stdout":
return zapcore.Lock(os.Stdout), nil
case "stderr":
return zapcore.Lock(os.Stderr), nil
case "/dev/null":
return zapcore.AddSync(io.Discard), nil
}
switch mode {
case FileModeRotate:
return logrotate(path, mode)
case FileModeTruncate:
return fs.OpenFile(path, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
default: // FileModeAppend
return fs.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
}
}
func logrotate(path string, mode FileMode) (zapcore.WriteSyncer, error) {
// Make sure directory exists
if _, err := os.Stat(filepath.Dir(path)); err != nil {
return nil, err
}
// lumberjack.Logger is already safe for concurrent use, so we don't need to
// lock it.
return zapcore.AddSync(&lumberjack.Logger{
Filename: path,
MaxSize: 5, // megabytes
MaxBackups: 3,
MaxAge: 28, // days
Compress: true,
}), nil
}