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package target
import (
"context"
"io"
"github.com/mattermost/logr"
"github.com/wiggin77/merror"
"gopkg.in/natefinch/lumberjack.v2"
)
type FileOptions struct {
// Filename is the file to write logs to. Backup log files will be retained
// in the same directory. It uses <processname>-lumberjack.log in
// os.TempDir() if empty.
Filename string
// MaxSize is the maximum size in megabytes of the log file before it gets
// rotated. It defaults to 100 megabytes.
MaxSize int
// MaxAge is the maximum number of days to retain old log files based on the
// timestamp encoded in their filename. Note that a day is defined as 24
// hours and may not exactly correspond to calendar days due to daylight
// savings, leap seconds, etc. The default is not to remove old log files
// based on age.
MaxAge int
// MaxBackups is the maximum number of old log files to retain. The default
// is to retain all old log files (though MaxAge may still cause them to get
// deleted.)
MaxBackups int
// Compress determines if the rotated log files should be compressed
// using gzip. The default is not to perform compression.
Compress bool
}
// File outputs log records to a file which can be log rotated based on size or age.
// Uses `https://github.com/natefinch/lumberjack` for rotation.
type File struct {
logr.Basic
out io.WriteCloser
}
// NewFileTarget creates a target capable of outputting log records to a rotated file.
func NewFileTarget(filter logr.Filter, formatter logr.Formatter, opts FileOptions, maxQueue int) *File {
lumber := &lumberjack.Logger{
Filename: opts.Filename,
MaxSize: opts.MaxSize,
MaxBackups: opts.MaxBackups,
MaxAge: opts.MaxAge,
Compress: opts.Compress,
}
f := &File{out: lumber}
f.Basic.Start(f, f, filter, formatter, maxQueue)
return f
}
// Write converts the log record to bytes, via the Formatter,
// and outputs to a file.
func (f *File) Write(rec *logr.LogRec) error {
_, stacktrace := f.IsLevelEnabled(rec.Level())
buf := rec.Logger().Logr().BorrowBuffer()
defer rec.Logger().Logr().ReleaseBuffer(buf)
buf, err := f.Formatter().Format(rec, stacktrace, buf)
if err != nil {
return err
}
_, err = f.out.Write(buf.Bytes())
return err
}
// Shutdown flushes any remaining log records and closes the file.
func (f *File) Shutdown(ctx context.Context) error {
errs := merror.New()
err := f.Basic.Shutdown(ctx)
errs.Append(err)
err = f.out.Close()
errs.Append(err)
return errs.ErrorOrNil()
}
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