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