/
klog.go
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/
klog.go
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// Copyright Istio 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 (
goflag "flag"
"fmt"
"sync"
"github.com/spf13/pflag"
"k8s.io/klog/v2"
)
var (
KlogScope = RegisterScope("klog", "")
configureKlog = sync.Once{}
)
// EnableKlogWithCobra enables klog to work with cobra / pflags.
// k8s libraries like client-go use klog.
func EnableKlogWithCobra() {
gf := klogVerboseFlag()
pflag.CommandLine.AddFlag(pflag.PFlagFromGoFlag(
&goflag.Flag{
Name: "vklog",
Value: gf.Value,
DefValue: gf.DefValue,
Usage: gf.Usage + ". Like -v flag. ex: --vklog=9",
}))
}
// EnableKlogWithCobra enables klog to work with go flags.
// k8s libraries like client-go use klog.
func EnableKlogWithGoFlag() {
gf := klogVerboseFlag()
goflag.CommandLine.Var(gf.Value, "vklog", gf.Usage+". Like -v flag. ex: --vklog=9")
}
// isKlogVerbose returns true if klog verbosity is non-zero.
func klogVerbose() bool {
gf := klogVerboseFlag()
return gf.Value.String() != "0"
}
var (
klogFlagSet = &goflag.FlagSet{}
klogFlagSetOnce = sync.Once{}
)
// KlogVerboseFlag returns verbose flag from the klog library.
// After parsing it contains the parsed verbosity value.
func klogVerboseFlag() *goflag.Flag {
klogFlagSetOnce.Do(func() {
klog.InitFlags(klogFlagSet)
})
// --v= flag of klog.
return klogFlagSet.Lookup("v")
}
// EnableKlogWithVerbosity sets the klog verbosity directly.
// When using in an application, EnableKlogWithCobra is preferred to expose a --vklog flag.
func EnableKlogWithVerbosity(v int) {
_ = klogFlagSet.Set("v", fmt.Sprint(v))
}