/
logger.go
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/
logger.go
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//
// Copyright 2020 IBM Corporation
//
// 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 logger
import (
"bytes"
"os"
"time"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
log "github.com/sirupsen/logrus"
)
type LoggerConfig struct {
Level string
Format string
FileDest string
}
var ServerLogger *log.Entry
var SessionTrace *SessionTraceHook
var SessionLogger *log.Entry
func GetServerLogger() *log.Entry {
return ServerLogger
}
func GetSessionLogger() *log.Entry {
return SessionLogger
}
func GetSessionTraceString() string {
return SessionTrace.GetBufferedString()
}
func InitServerLogger(config LoggerConfig) {
ServerLoggerLogger := newLogger(config)
sessionTraceHook := NewSessionTraceHook(logrus.TraceLevel, &log.TextFormatter{})
SessionTrace = sessionTraceHook
ServerLoggerLogger.AddHook(sessionTraceHook)
ServerLogger = ServerLoggerLogger.WithField("loggerUID", uuid.New().String())
}
func InitSessionLogger(namespace, name, apiVersion, kind, operation string) {
SessionTrace.Reset()
SessionLogger = ServerLogger.WithFields(log.Fields{
"namespace": namespace,
"name": name,
"apiVersion": apiVersion,
"kind": kind,
"operation": operation,
})
}
func newLogger(conf LoggerConfig) *log.Logger {
logger := log.New()
if conf.Format == "json" {
logger.SetFormatter(&log.JSONFormatter{TimestampFormat: time.RFC3339Nano})
}
logLevel := log.InfoLevel
if conf.Level != "" {
lvl, err := log.ParseLevel(conf.Level)
if err != nil {
logger.Info("Failed to parse log level, using info level")
} else {
logLevel = lvl
}
}
logger.SetLevel(logLevel)
if conf.FileDest != "" {
file, err := os.OpenFile(conf.FileDest, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err == nil {
logger.Out = file
} else {
logger.Info("Failed to log to file, using default stderr")
}
} else {
logger.Out = os.Stdout
}
return logger
}
/*
Hook for Logging to Buffer
*/
type SessionTraceHook struct {
writer *bytes.Buffer
minLevel logrus.Level
formatter logrus.Formatter
}
func (hook *SessionTraceHook) Reset() {
(*hook.writer).Reset()
}
func (hook *SessionTraceHook) GetBufferedString() string {
s := (*hook.writer).String()
hook.Reset()
return s
}
func NewSessionTraceHook(minLevel logrus.Level, formatter logrus.Formatter) *SessionTraceHook {
return &SessionTraceHook{
writer: &bytes.Buffer{},
minLevel: minLevel,
formatter: formatter,
}
}
func (hook *SessionTraceHook) Fire(entry *logrus.Entry) error {
msg, err := hook.formatter.Format(entry)
if err != nil {
return err
}
if hook.writer != nil {
_, err = (*hook.writer).Write([]byte(msg))
}
return err
}
func (hook *SessionTraceHook) Levels() []logrus.Level {
return logrus.AllLevels[:hook.minLevel+1]
}
func Panic(args ...interface{}) {
ServerLogger.Panic(args...)
}
func Fatal(args ...interface{}) {
ServerLogger.Fatal(args...)
}
func Error(args ...interface{}) {
ServerLogger.Error(args...)
}
func Warn(args ...interface{}) {
ServerLogger.Warn(args...)
}
func Info(args ...interface{}) {
ServerLogger.Info(args...)
}
func Debug(args ...interface{}) {
ServerLogger.Debug(args...)
}
func Trace(args ...interface{}) {
ServerLogger.Trace(args...)
}
func WithFields(fields log.Fields) *log.Entry {
return ServerLogger.WithFields(fields)
}