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Deluan
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
package log
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import (
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"fmt"
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"github.com/sirupsen/logrus"
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)
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// journalFormatter wraps a logrus.Formatter and prepends a syslog priority
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// prefix (<N>) to each log line. When stderr is captured by systemd-journald,
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// this prefix tells journald the correct severity for each message.
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//
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// See https://www.freedesktop.org/software/systemd/man/sd-daemon.html
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type journalFormatter struct {
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inner logrus.Formatter
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}
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// levelToPriority maps logrus levels to syslog priority values.
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// The mapping follows RFC 5424 severity levels.
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var levelToPriority = map[logrus.Level]int{
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logrus.PanicLevel: 0, // emerg
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logrus.FatalLevel: 2, // crit
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logrus.ErrorLevel: 3, // err
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logrus.WarnLevel: 4, // warning
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logrus.InfoLevel: 6, // info
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logrus.DebugLevel: 7, // debug
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logrus.TraceLevel: 7, // debug
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}
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func (f *journalFormatter) Format(entry *logrus.Entry) ([]byte, error) {
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formatted, err := f.inner.Format(entry)
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if err != nil {
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return formatted, err
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}
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priority, ok := levelToPriority[entry.Level]
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if !ok {
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priority = 6 // default to info for unknown levels
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}
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prefix := fmt.Appendf(nil, "<%d>", priority)
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return append(prefix, formatted...), nil
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}
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