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feat: add support for structured logs
This is a port of GoogleCloudPlatform/cloud-sql-proxy#1246
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Copyright 2022 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package log | ||
|
|
||
| import ( | ||
| "io" | ||
| llog "log" | ||
| "os" | ||
|
|
||
| "github.com/GoogleCloudPlatform/alloydb-auth-proxy/alloydb" | ||
| "go.uber.org/zap" | ||
| "go.uber.org/zap/zapcore" | ||
| ) | ||
|
|
||
| // StdLogger is the standard logger that distinguishes between info and error | ||
| // logs. | ||
| type StdLogger struct { | ||
| infoLog *llog.Logger | ||
| errLog *llog.Logger | ||
| } | ||
|
|
||
| // NewStdLogger create a Logger that uses out and err for informational and | ||
| // error messages. | ||
| func NewStdLogger(out, err io.Writer) alloydb.Logger { | ||
| return &StdLogger{ | ||
| infoLog: llog.New(out, "", llog.LstdFlags), | ||
| errLog: llog.New(err, "", llog.LstdFlags), | ||
| } | ||
| } | ||
|
|
||
| func (l *StdLogger) Infof(format string, v ...interface{}) { | ||
| l.infoLog.Printf(format, v...) | ||
| } | ||
|
|
||
| func (l *StdLogger) Errorf(format string, v ...interface{}) { | ||
| l.errLog.Printf(format, v...) | ||
| } | ||
|
|
||
| func (l *StdLogger) Debugf(format string, v ...interface{}) { | ||
| l.infoLog.Printf(format, v...) | ||
| } | ||
|
|
||
| // StructuredLogger writes log messages in JSON. | ||
| type StructuredLogger struct { | ||
| logger *zap.SugaredLogger | ||
| } | ||
|
|
||
| func (l *StructuredLogger) Infof(format string, v ...interface{}) { | ||
| l.logger.Infof(format, v...) | ||
| } | ||
|
|
||
| func (l *StructuredLogger) Errorf(format string, v ...interface{}) { | ||
| l.logger.Errorf(format, v...) | ||
| } | ||
|
|
||
| func (l *StructuredLogger) Debugf(format string, v ...interface{}) { | ||
| l.logger.Infof(format, v...) | ||
| } | ||
|
|
||
| // NewStructuredLogger creates a Logger that logs messages using JSON. | ||
| func NewStructuredLogger() (alloydb.Logger, func() error) { | ||
| // Configure structured logs to adhere to LogEntry format | ||
| // https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry | ||
| c := zap.NewProductionEncoderConfig() | ||
| c.LevelKey = "severity" | ||
| c.MessageKey = "message" | ||
| c.TimeKey = "timestamp" | ||
| c.EncodeLevel = zapcore.CapitalLevelEncoder | ||
| c.EncodeTime = zapcore.ISO8601TimeEncoder | ||
|
|
||
| enc := zapcore.NewJSONEncoder(c) | ||
| core := zapcore.NewTee( | ||
| zapcore.NewCore(enc, zapcore.Lock(os.Stdout), zap.LevelEnablerFunc(func(l zapcore.Level) bool { | ||
| // Anything below error, goes to the info log. | ||
| return l < zapcore.ErrorLevel | ||
| })), | ||
| zapcore.NewCore(enc, zapcore.Lock(os.Stderr), zap.LevelEnablerFunc(func(l zapcore.Level) bool { | ||
| // Anything at error or higher goes to the error log. | ||
| return l >= zapcore.ErrorLevel | ||
| })), | ||
| ) | ||
| l := &StructuredLogger{ | ||
| logger: zap.New(core).Sugar(), | ||
| } | ||
| return l, l.logger.Sync | ||
| } |
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