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log.go
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log.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2017 Red Hat, Inc.
*
*/
package log
import (
"errors"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strconv"
"sync"
"time"
"github.com/go-kit/kit/log"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sruntime "k8s.io/apimachinery/pkg/runtime"
)
var lock sync.Mutex
type logLevel int
const (
DEBUG logLevel = iota
INFO
WARNING
ERROR
CRITICAL
)
var logLevelNames = map[logLevel]string{
DEBUG: "debug",
INFO: "info",
WARNING: "warning",
ERROR: "error",
CRITICAL: "critical",
}
type LoggableObject interface {
metav1.ObjectMetaAccessor
k8sruntime.Object
}
type FilteredLogger struct {
logContext *log.Context
component string
filterLevel logLevel
currentLogLevel logLevel
verbosityLevel int
currentVerbosityLevel int
err error
}
var Log = DefaultLogger()
func InitializeLogging(comp string) {
flag.StringVar(&defaultComponent, "component", comp, "Default component for logs")
Log = DefaultLogger()
}
// Wrap a go-kit logger in a FilteredLogger. Not cached
func MakeLogger(logger log.Logger) *FilteredLogger {
defaultLogLevel := INFO
if verbosityFlag := flag.Lookup("v"); verbosityFlag != nil {
defaultVerbosity, _ = strconv.Atoi(verbosityFlag.Value.String())
} else {
defaultVerbosity = 0
}
return &FilteredLogger{
logContext: log.NewContext(logger),
component: defaultComponent,
filterLevel: defaultLogLevel,
currentLogLevel: defaultLogLevel,
verbosityLevel: defaultVerbosity,
currentVerbosityLevel: defaultVerbosity,
}
}
type NullLogger struct{}
func (n NullLogger) Log(params ...interface{}) error { return nil }
var loggers = make(map[string]*FilteredLogger)
var defaultComponent = ""
var defaultVerbosity = 0
func createLogger(component string) {
lock.Lock()
defer lock.Unlock()
_, ok := loggers[component]
if ok == false {
logger := log.NewLogfmtLogger(os.Stderr)
log := MakeLogger(logger)
log.component = component
loggers[component] = log
}
}
func Logger(component string) *FilteredLogger {
_, ok := loggers[component]
if ok == false {
createLogger(component)
}
return loggers[component]
}
func DefaultLogger() *FilteredLogger {
return Logger(defaultComponent)
}
func (l *FilteredLogger) SetIOWriter(w io.Writer) {
l.logContext = log.NewContext(log.NewLogfmtLogger(w))
}
func (l *FilteredLogger) SetLogger(logger log.Logger) *FilteredLogger {
l.logContext = log.NewContext(logger)
return l
}
type LogError struct {
message string
}
func (e LogError) Error() string {
return e.message
}
func (l FilteredLogger) Msg(msg interface{}) {
l.log(2, "msg", msg)
}
func (l FilteredLogger) Msgf(msg string, args ...interface{}) {
l.log(2, "msg", fmt.Sprintf(msg, args...))
}
func (l FilteredLogger) Log(params ...interface{}) error {
return l.log(2, params...)
}
func (l FilteredLogger) log(skipFrames int, params ...interface{}) error {
// messages should be logged if any of these conditions are met:
// The log filtering level is debug
// The log filtering level is info and verbosity checks match
// The log message priority is warning or higher
force := (l.filterLevel == DEBUG) || (l.currentLogLevel >= WARNING)
if force || (l.filterLevel == INFO &&
(l.currentLogLevel == l.filterLevel) &&
(l.currentVerbosityLevel <= l.verbosityLevel)) {
now := time.Now().UTC()
_, fileName, lineNumber, _ := runtime.Caller(skipFrames)
logParams := make([]interface{}, 0, 8)
logParams = append(logParams,
"level", logLevelNames[l.currentLogLevel],
"timestamp", now.Format("2006-01-02T15:04:05.000000Z"),
"pos", fmt.Sprintf("%s:%d", filepath.Base(fileName), lineNumber),
"component", l.component,
)
if l.err != nil {
l.logContext = l.logContext.With("reason", l.err)
}
return l.logContext.WithPrefix(logParams...).Log(params...)
}
return nil
}
func (l FilteredLogger) Object(obj LoggableObject) *FilteredLogger {
name := obj.GetObjectMeta().GetName()
namespace := obj.GetObjectMeta().GetNamespace()
uid := obj.GetObjectMeta().GetUID()
kind := obj.GetObjectKind().GroupVersionKind().Kind
logParams := make([]interface{}, 0)
logParams = append(logParams, "namespace", namespace)
logParams = append(logParams, "name", name)
logParams = append(logParams, "kind", kind)
logParams = append(logParams, "uid", uid)
l.With(logParams...)
return &l
}
func (l *FilteredLogger) With(obj ...interface{}) *FilteredLogger {
l.logContext = l.logContext.With(obj...)
return l
}
func (l *FilteredLogger) WithPrefix(obj ...interface{}) *FilteredLogger {
l.logContext = l.logContext.WithPrefix(obj...)
return l
}
func (l *FilteredLogger) SetLogLevel(filterLevel logLevel) error {
if (filterLevel >= DEBUG) && (filterLevel <= CRITICAL) {
l.filterLevel = filterLevel
return nil
}
return errors.New(fmt.Sprintf("Log level %d does not exist", filterLevel))
}
func (l *FilteredLogger) SetVerbosityLevel(level int) error {
if level >= 0 {
l.verbosityLevel = level
} else {
return errors.New("Verbosity setting must not be negative")
}
return nil
}
// It would be consistent to return an error from this function, but
// a multi-value function would break the primary use case: log.V(2).Info()....
func (l FilteredLogger) V(level int) *FilteredLogger {
if level >= 0 {
l.currentVerbosityLevel = level
}
return &l
}
func (l FilteredLogger) Reason(err error) *FilteredLogger {
l.err = err
return &l
}
func (l FilteredLogger) Level(level logLevel) *FilteredLogger {
l.currentLogLevel = level
return &l
}
func (l FilteredLogger) Debug(msg string) {
l.Level(DEBUG).Msg(msg)
}
func (l FilteredLogger) Debugf(msg string, args ...interface{}) {
l.Level(DEBUG).Msgf(msg, args...)
}
func (l FilteredLogger) Info(msg string) {
l.Level(INFO).Msg(msg)
}
func (l FilteredLogger) Infof(msg string, args ...interface{}) {
l.Level(INFO).Msgf(msg, args...)
}
func (l FilteredLogger) Warning(msg string) {
l.Level(WARNING).Msg(msg)
}
func (l FilteredLogger) Warningf(msg string, args ...interface{}) {
l.Level(WARNING).Msgf(msg, args...)
}
func (l FilteredLogger) Error(msg string) {
l.Level(ERROR).Msg(msg)
}
func (l FilteredLogger) Errorf(msg string, args ...interface{}) {
l.Level(ERROR).Msgf(msg, args...)
}
func (l FilteredLogger) Critical(msg string) {
l.Level(CRITICAL).Msg(msg)
}
func (l FilteredLogger) Criticalf(msg string, args ...interface{}) {
l.Level(CRITICAL).Msgf(msg, args...)
}