/
log_level.go
76 lines (63 loc) · 1.83 KB
/
log_level.go
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// Copyright 2020 Antrea Authors
//
// 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 (
"fmt"
"github.com/spf13/pflag"
"k8s.io/klog/v2"
)
const logVerbosityFlag = "v"
type logLevelManager struct {
// we use this to access the verbosity value at runtime
flag *pflag.Flag
}
var logLevelMgr = &logLevelManager{}
func (m *logLevelManager) getCurrentLogLevel() string {
if m.flag == nil {
return "UNKNOWN"
}
return m.flag.Value.String()
}
func (m *logLevelManager) setLogLevel(level string) error {
if m.flag == nil {
return fmt.Errorf("verbosity flag is unknown")
}
oldLevel := m.getCurrentLogLevel()
if oldLevel == level {
return nil
}
var l klog.Level
err := l.Set(level)
if err != nil {
return err
}
klog.InfoS("Changed log level", "from", oldLevel, "to", level)
return nil
}
func initLogLevelManager(fs *pflag.FlagSet) {
flag := fs.Lookup(logVerbosityFlag)
if flag == nil {
klog.ErrorS(nil, "Failed to lookup verbosity flag", "flag", logVerbosityFlag)
}
logLevelMgr.flag = flag
}
// GetCurrentLogLevel returns the current log verbosity level.
func GetCurrentLogLevel() string {
return logLevelMgr.getCurrentLogLevel()
}
// SetLogLevel sets the log verbosity level. level must be a string
// representation of a decimal integer.
func SetLogLevel(level string) error {
return logLevelMgr.setLogLevel(level)
}