126 lines
2.8 KiB
Go
126 lines
2.8 KiB
Go
// +build !windows
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// Package journald provides a io.Writer to send the logs
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// to journalD component of systemd.
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package journald
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// This file provides a zerolog writer so that logs printed
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// using zerolog library can be sent to a journalD.
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// Zerolog's Top level key/Value Pairs are translated to
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// journald's args - all Values are sent to journald as strings.
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// And all key strings are converted to uppercase before sending
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// to journald (as required by journald).
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// In addition, entire log message (all Key Value Pairs), is also
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// sent to journald under the key "JSON".
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"strings"
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"github.com/coreos/go-systemd/journal"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/internal/cbor"
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)
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const defaultJournalDPrio = journal.PriNotice
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// NewJournalDWriter returns a zerolog log destination
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// to be used as parameter to New() calls. Writing logs
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// to this writer will send the log messages to journalD
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// running in this system.
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func NewJournalDWriter() io.Writer {
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return journalWriter{}
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}
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type journalWriter struct {
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}
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// levelToJPrio converts zerolog Level string into
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// journalD's priority values. JournalD has more
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// priorities than zerolog.
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func levelToJPrio(zLevel string) journal.Priority {
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lvl, _ := zerolog.ParseLevel(zLevel)
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switch lvl {
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case zerolog.TraceLevel:
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return journal.PriDebug
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case zerolog.DebugLevel:
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return journal.PriDebug
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case zerolog.InfoLevel:
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return journal.PriInfo
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case zerolog.WarnLevel:
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return journal.PriWarning
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case zerolog.ErrorLevel:
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return journal.PriErr
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case zerolog.FatalLevel:
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return journal.PriCrit
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case zerolog.PanicLevel:
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return journal.PriEmerg
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case zerolog.NoLevel:
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return journal.PriNotice
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}
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return defaultJournalDPrio
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}
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func (w journalWriter) Write(p []byte) (n int, err error) {
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if !journal.Enabled() {
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err = fmt.Errorf("cannot connect to journalD")
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return
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}
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var event map[string]interface{}
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origPLen := len(p)
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p = cbor.DecodeIfBinaryToBytes(p)
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d := json.NewDecoder(bytes.NewReader(p))
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d.UseNumber()
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err = d.Decode(&event)
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jPrio := defaultJournalDPrio
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args := make(map[string]string, 0)
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if err != nil {
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return
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}
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if l, ok := event[zerolog.LevelFieldName].(string); ok {
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jPrio = levelToJPrio(l)
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}
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msg := ""
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for key, value := range event {
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jKey := strings.ToUpper(key)
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switch key {
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case zerolog.LevelFieldName, zerolog.TimestampFieldName:
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continue
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case zerolog.MessageFieldName:
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msg, _ = value.(string)
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continue
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}
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switch value.(type) {
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case string:
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args[jKey], _ = value.(string)
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case json.Number:
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args[jKey] = fmt.Sprint(value)
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default:
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b, err := json.Marshal(value)
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if err != nil {
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args[jKey] = fmt.Sprintf("[error: %v]", err)
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} else {
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args[jKey] = string(b)
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}
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}
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}
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args["JSON"] = string(p)
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err = journal.Send(msg, jPrio, args)
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if err == nil {
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n = origPLen
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}
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return
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}
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