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journalhook_linux.go
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journalhook_linux.go
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//go:build linux
// Package journald was copied directly from https://github.com/wercker/journalhook,
// where this library was previously hosted.
package journald
import (
"fmt"
"strings"
"github.com/coreos/go-systemd/journal"
"github.com/sirupsen/logrus"
)
type JournalHook struct{}
var (
severityMap = map[logrus.Level]journal.Priority{
logrus.DebugLevel: journal.PriDebug,
logrus.InfoLevel: journal.PriInfo,
logrus.WarnLevel: journal.PriWarning,
logrus.ErrorLevel: journal.PriErr,
logrus.FatalLevel: journal.PriCrit,
logrus.PanicLevel: journal.PriEmerg,
}
)
func stringifyOp(r rune) rune {
// Journal wants uppercase strings. See `validVarName`
// https://github.com/coreos/go-systemd/blob/ff118ad0f8d9cf99903d3391ca3a295671022cee/journal/journal.go#L137-L147
switch {
case r >= 'A' && r <= 'Z':
return r
case r >= '0' && r <= '9':
return r
case r == '_':
return r
case r >= 'a' && r <= 'z':
return r - 32
default:
return rune('_')
}
}
func stringifyKey(key string) string {
key = strings.Map(stringifyOp, key)
key = strings.TrimPrefix(key, "_")
return key
}
// Journal wants strings but logrus takes anything.
func stringifyEntries(data map[string]interface{}) map[string]string {
entries := make(map[string]string)
for k, v := range data {
key := stringifyKey(k)
entries[key] = fmt.Sprint(v)
}
return entries
}
// Fire fires an entry into the journal.
func (hook *JournalHook) Fire(entry *logrus.Entry) error {
return journal.Send(entry.Message, severityMap[entry.Level], stringifyEntries(entry.Data))
}
// Levels returns a slice of `Levels` the hook is fired for.
func (hook *JournalHook) Levels() []logrus.Level {
return []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
logrus.WarnLevel,
logrus.InfoLevel,
logrus.DebugLevel,
}
}