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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"
goflag "flag"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"time"
klog "github.com/go-kit/kit/log"
"github.com/golang/glog"
flag "github.com/spf13/pflag"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sruntime "k8s.io/apimachinery/pkg/runtime"
)
const (
libvirtTimestampFormat = "2006-01-02 15:04:05.999-0700"
logTimestampFormat = "2006-01-02T15:04:05.000000Z"
)
type LogLevel int32
const (
INFO LogLevel = iota
WARNING
ERROR
FATAL
)
var LogLevelNames = map[LogLevel]string{
INFO: "info",
WARNING: "warning",
ERROR: "error",
FATAL: "fatal",
}
var lock sync.Mutex
type LoggableObject interface {
metav1.ObjectMetaAccessor
k8sruntime.Object
}
type FilteredVerbosityLogger struct {
filteredLogger FilteredLogger
}
type FilteredLogger struct {
logger klog.Logger
component string
filterLevel LogLevel
currentLogLevel LogLevel
verbosityLevel int
currentVerbosityLevel int
err error
}
var Log = DefaultLogger()
func InitializeLogging(comp string) {
defaultComponent = comp
Log = DefaultLogger()
glog.CopyStandardLogTo(LogLevelNames[INFO])
goflag.CommandLine.Set("component", comp)
goflag.CommandLine.Set("logtostderr", "true")
}
func getDefaultVerbosity() int {
if verbosityFlag := flag.Lookup("v"); verbosityFlag != nil {
defaultVerbosity, _ := strconv.Atoi(verbosityFlag.Value.String())
return defaultVerbosity
} else {
// "the practical default level is V(2)"
// see https://github.com/kubernetes/community/blob/master/contributors/devel/logging.md
return 2
}
}
// Wrap a go-kit logger in a FilteredLogger. Not cached
func MakeLogger(logger klog.Logger) *FilteredLogger {
defaultLogLevel := INFO
defaultVerbosity = getDefaultVerbosity()
// This verbosity will be used for info logs without setting a custom verbosity level
defaultCurrentVerbosity := 2
return &FilteredLogger{
logger: logger,
component: defaultComponent,
filterLevel: defaultLogLevel,
currentLogLevel: defaultLogLevel,
verbosityLevel: defaultVerbosity,
currentVerbosityLevel: defaultCurrentVerbosity,
}
}
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 := klog.NewJSONLogger(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)
}
// SetIOWriter is meant to be used for testing. "log" and "glog" logs are sent to /dev/nil.
// KubeVirt related log messages will be sent to this writer
func (l *FilteredLogger) SetIOWriter(w io.Writer) {
l.logger = klog.NewJSONLogger(w)
goflag.CommandLine.Set("logtostderr", "false")
}
func (l *FilteredLogger) SetLogger(logger klog.Logger) *FilteredLogger {
l.logger = logger
return l
}
type LogError struct {
message string
}
func (e LogError) Error() string {
return e.message
}
func (l FilteredLogger) msg(msg interface{}) {
l.log(3, "msg", msg)
}
func (l FilteredLogger) msgf(msg string, args ...interface{}) {
l.log(3, "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 info and verbosity checks match
// The log message priority is warning or higher
if l.currentLogLevel >= WARNING || (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(logTimestampFormat),
"pos", fmt.Sprintf("%s:%d", filepath.Base(fileName), lineNumber),
"component", l.component,
)
if l.err != nil {
l.logger = klog.With(l.logger, "reason", l.err)
}
return klog.WithPrefix(l.logger, logParams...).Log(params...)
}
return nil
}
func (l FilteredVerbosityLogger) Log(params ...interface{}) error {
return l.filteredLogger.log(2, params...)
}
func (l FilteredVerbosityLogger) V(level int) *FilteredVerbosityLogger {
if level >= 0 {
l.filteredLogger.currentVerbosityLevel = level
}
return &l
}
func (l FilteredVerbosityLogger) Info(msg string) {
l.filteredLogger.Level(INFO).log(2, "msg", msg)
}
func (l FilteredVerbosityLogger) Infof(msg string, args ...interface{}) {
l.filteredLogger.log(2, "msg", fmt.Sprintf(msg, args...))
}
func (l FilteredVerbosityLogger) Object(obj LoggableObject) *FilteredVerbosityLogger {
l.filteredLogger.Object(obj)
return &l
}
func (l FilteredVerbosityLogger) Reason(err error) *FilteredVerbosityLogger {
l.filteredLogger.err = err
return &l
}
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)
if namespace != "" {
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.logger = klog.With(l.logger, obj...)
return &l
}
func (l *FilteredLogger) with(obj ...interface{}) *FilteredLogger {
l.logger = klog.With(l.logger, obj...)
return l
}
func (l *FilteredLogger) SetLogLevel(filterLevel LogLevel) error {
if (filterLevel >= INFO) && (filterLevel <= FATAL) {
l.filterLevel = filterLevel
return nil
}
return fmt.Errorf("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) *FilteredVerbosityLogger {
if level >= 0 {
l.currentVerbosityLevel = level
}
return &FilteredVerbosityLogger{
filteredLogger: 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) 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(FATAL).msg(msg)
panic(msg)
}
func (l FilteredLogger) Criticalf(msg string, args ...interface{}) {
l.Level(FATAL).msgf(msg, args...)
}
func LogLibvirtLogLine(logger *FilteredLogger, line string) {
if len(strings.TrimSpace(line)) == 0 {
return
}
fragments := strings.SplitN(line, ": ", 5)
if len(fragments) < 4 {
now := time.Now()
logger.logger.Log(
"level", "info",
"timestamp", now.Format(logTimestampFormat),
"component", logger.component,
"subcomponent", "libvirt",
"msg", line,
)
return
}
severity := strings.ToLower(strings.TrimSpace(fragments[2]))
if severity == "debug" {
severity = "info"
}
t, err := time.Parse(libvirtTimestampFormat, strings.TrimSpace(fragments[0]))
if err != nil {
fmt.Println(err)
return
}
thread := strings.TrimSpace(fragments[1])
pos := strings.TrimSpace(fragments[3])
msg := strings.TrimSpace(fragments[4])
//TODO: implement proper behavior for unsupported GA commands
// by either considering the GA version as unsupported or just don't
// send commands which not supported
if strings.Contains(msg, "unable to execute QEMU agent command") {
if logger.verbosityLevel < 4 {
return
}
severity = LogLevelNames[WARNING]
}
// check if we really got a position
isPos := false
if split := strings.Split(pos, ":"); len(split) == 2 {
if _, err := strconv.Atoi(split[1]); err == nil {
isPos = true
}
}
if !isPos {
msg = strings.TrimSpace(fragments[3] + ": " + fragments[4])
logger.logger.Log(
"level", severity,
"timestamp", t.Format(logTimestampFormat),
"component", logger.component,
"subcomponent", "libvirt",
"thread", thread,
"msg", msg,
)
} else {
logger.logger.Log(
"level", severity,
"timestamp", t.Format(logTimestampFormat),
"pos", pos,
"component", logger.component,
"subcomponent", "libvirt",
"thread", thread,
"msg", msg,
)
}
}
var qemuLogLines = ""
func LogQemuLogLine(logger *FilteredLogger, line string) {
if len(strings.TrimSpace(line)) == 0 {
return
}
// Concat break lines to have full command in one log message
if strings.HasSuffix(line, "\\") {
qemuLogLines += line
return
}
if len(qemuLogLines) > 0 {
line = qemuLogLines + line
qemuLogLines = ""
}
now := time.Now()
logger.logger.Log(
"level", "info",
"timestamp", now.Format(logTimestampFormat),
"component", logger.component,
"subcomponent", "qemu",
"msg", line,
)
}