89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
// +build !windows
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// +build !binary_log
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package zerolog
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import (
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"io"
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)
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// See http://cee.mitre.org/language/1.0-beta1/clt.html#syslog
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// or https://www.rsyslog.com/json-elasticsearch/
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const ceePrefix = "@cee:"
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// SyslogWriter is an interface matching a syslog.Writer struct.
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type SyslogWriter interface {
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io.Writer
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Debug(m string) error
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Info(m string) error
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Warning(m string) error
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Err(m string) error
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Emerg(m string) error
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Crit(m string) error
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}
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type syslogWriter struct {
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w SyslogWriter
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prefix string
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}
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// SyslogLevelWriter wraps a SyslogWriter and call the right syslog level
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// method matching the zerolog level.
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func SyslogLevelWriter(w SyslogWriter) LevelWriter {
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return syslogWriter{w, ""}
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}
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// SyslogCEEWriter wraps a SyslogWriter with a SyslogLevelWriter that adds a
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// MITRE CEE prefix for JSON syslog entries, compatible with rsyslog
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// and syslog-ng JSON logging support.
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// See https://www.rsyslog.com/json-elasticsearch/
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func SyslogCEEWriter(w SyslogWriter) LevelWriter {
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return syslogWriter{w, ceePrefix}
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}
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func (sw syslogWriter) Write(p []byte) (n int, err error) {
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var pn int
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if sw.prefix != "" {
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pn, err = sw.w.Write([]byte(sw.prefix))
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if err != nil {
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return pn, err
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}
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}
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n, err = sw.w.Write(p)
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return pn + n, err
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}
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// WriteLevel implements LevelWriter interface.
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func (sw syslogWriter) WriteLevel(level Level, p []byte) (n int, err error) {
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switch level {
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case TraceLevel:
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case DebugLevel:
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err = sw.w.Debug(sw.prefix + string(p))
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case InfoLevel:
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err = sw.w.Info(sw.prefix + string(p))
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case WarnLevel:
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err = sw.w.Warning(sw.prefix + string(p))
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case ErrorLevel:
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err = sw.w.Err(sw.prefix + string(p))
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case FatalLevel:
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err = sw.w.Emerg(sw.prefix + string(p))
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case PanicLevel:
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err = sw.w.Crit(sw.prefix + string(p))
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case NoLevel:
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err = sw.w.Info(sw.prefix + string(p))
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default:
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panic("invalid level")
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}
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// Any CEE prefix is not part of the message, so we don't include its length
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n = len(p)
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return
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}
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// Call the underlying writer's Close method if it is an io.Closer. Otherwise
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// does nothing.
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func (sw syslogWriter) Close() error {
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if c, ok := sw.w.(io.Closer); ok {
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return c.Close()
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}
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return nil
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}
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