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93 lines
2.4 KiB
93 lines
2.4 KiB
// Copyright 2018 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !windows
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package logutil
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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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"os"
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"path/filepath"
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"go.etcd.io/etcd/pkg/systemd"
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"github.com/coreos/go-systemd/journal"
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"go.uber.org/zap/zapcore"
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)
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// NewJournalWriter wraps "io.Writer" to redirect log output
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// to the local systemd journal. If journald send fails, it fails
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// back to writing to the original writer.
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// The decode overhead is only <30µs per write.
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// Reference: https://github.com/coreos/pkg/blob/master/capnslog/journald_formatter.go
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func NewJournalWriter(wr io.Writer) (io.Writer, error) {
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return &journalWriter{Writer: wr}, systemd.DialJournal()
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}
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type journalWriter struct {
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io.Writer
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}
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// WARN: assume that etcd uses default field names in zap encoder config
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// make sure to keep this up-to-date!
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type logLine struct {
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Level string `json:"level"`
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Caller string `json:"caller"`
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}
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func (w *journalWriter) Write(p []byte) (int, error) {
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line := &logLine{}
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if err := json.NewDecoder(bytes.NewReader(p)).Decode(line); err != nil {
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return 0, err
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}
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var pri journal.Priority
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switch line.Level {
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case zapcore.DebugLevel.String():
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pri = journal.PriDebug
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case zapcore.InfoLevel.String():
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pri = journal.PriInfo
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case zapcore.WarnLevel.String():
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pri = journal.PriWarning
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case zapcore.ErrorLevel.String():
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pri = journal.PriErr
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case zapcore.DPanicLevel.String():
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pri = journal.PriCrit
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case zapcore.PanicLevel.String():
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pri = journal.PriCrit
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case zapcore.FatalLevel.String():
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pri = journal.PriCrit
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default:
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panic(fmt.Errorf("unknown log level: %q", line.Level))
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}
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err := journal.Send(string(p), pri, map[string]string{
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"PACKAGE": filepath.Dir(line.Caller),
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"SYSLOG_IDENTIFIER": filepath.Base(os.Args[0]),
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})
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if err != nil {
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// "journal" also falls back to stderr
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// "fmt.Fprintln(os.Stderr, s)"
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return w.Writer.Write(p)
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}
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return 0, nil
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}
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