109 lines
3 KiB
Go
109 lines
3 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package logp
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import (
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"strings"
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"github.com/pkg/errors"
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"go.uber.org/zap/zapcore"
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"golang.org/x/sys/windows/svc/eventlog"
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)
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const (
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// eventID is arbitrary but must be between [1-1000].
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eventID = 100
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supports = eventlog.Error | eventlog.Warning | eventlog.Info
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)
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const alreadyExistsMsg = "registry key already exists"
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type eventLogCore struct {
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zapcore.LevelEnabler
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encoder zapcore.Encoder
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fields []zapcore.Field
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log *eventlog.Log
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}
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func newEventLog(appName string, encoder zapcore.Encoder, enab zapcore.LevelEnabler) (zapcore.Core, error) {
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if appName == "" {
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return nil, errors.New("appName cannot be empty")
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}
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appName = strings.Title(strings.ToLower(appName))
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if err := eventlog.InstallAsEventCreate(appName, supports); err != nil {
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if !strings.Contains(err.Error(), alreadyExistsMsg) {
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return nil, errors.Wrap(err, "failed to setup eventlog")
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}
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}
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log, err := eventlog.Open(appName)
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if err != nil {
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return nil, errors.Wrap(err, "failed to open eventlog")
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}
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return &eventLogCore{
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LevelEnabler: enab,
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encoder: encoder,
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log: log,
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}, nil
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}
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func (c *eventLogCore) With(fields []zapcore.Field) zapcore.Core {
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clone := c.Clone()
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clone.fields = append(clone.fields, fields...)
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return clone
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}
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func (c *eventLogCore) Check(entry zapcore.Entry, checked *zapcore.CheckedEntry) *zapcore.CheckedEntry {
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if c.Enabled(entry.Level) {
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return checked.AddCore(entry, c)
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}
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return checked
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}
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func (c *eventLogCore) Write(entry zapcore.Entry, fields []zapcore.Field) error {
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buffer, err := c.encoder.EncodeEntry(entry, fields)
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if err != nil {
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return errors.Wrap(err, "failed to encode entry")
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}
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msg := buffer.String()
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switch entry.Level {
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case zapcore.DebugLevel, zapcore.InfoLevel:
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return c.log.Info(eventID, msg)
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case zapcore.WarnLevel:
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return c.log.Warning(eventID, msg)
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case zapcore.ErrorLevel, zapcore.DPanicLevel, zapcore.PanicLevel, zapcore.FatalLevel:
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return c.log.Error(eventID, msg)
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default:
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return errors.Errorf("unhandled log level: %v", entry.Level)
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}
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}
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func (c *eventLogCore) Sync() error {
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return nil
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}
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func (c *eventLogCore) Clone() *eventLogCore {
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clone := *c
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clone.encoder = c.encoder.Clone()
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clone.fields = make([]zapcore.Field, len(c.fields), len(c.fields)+10)
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copy(clone.fields, c.fields)
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return &clone
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}
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