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flags.go
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flags.go
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// Copyright 2019 The Operator-SDK 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 zap
import (
"flag"
"fmt"
"strconv"
"strings"
"github.com/spf13/pflag"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"k8s.io/klog"
)
var (
zapFlagSet *pflag.FlagSet
development bool
encoderVal encoderValue
levelVal levelValue
sampleVal sampleValue
)
func init() {
zapFlagSet = pflag.NewFlagSet("zap", pflag.ExitOnError)
zapFlagSet.BoolVar(&development, "zap-devel", false, "Enable zap development mode (changes defaults to console encoder, debug log level, and disables sampling)")
zapFlagSet.Var(&encoderVal, "zap-encoder", "Zap log encoding ('json' or 'console')")
zapFlagSet.Var(&levelVal, "zap-level", "Zap log level (one of 'debug', 'info', 'error' or any integer value > 0)")
zapFlagSet.Var(&sampleVal, "zap-sample", "Enable zap log sampling. Sampling will be disabled for integer log levels > 1")
}
// FlagSet - The zap logging flagset.
func FlagSet() *pflag.FlagSet {
return zapFlagSet
}
type encoderValue struct {
set bool
encoder zapcore.Encoder
str string
}
func (v *encoderValue) Set(e string) error {
v.set = true
switch e {
case "json":
v.encoder = jsonEncoder()
case "console":
v.encoder = consoleEncoder()
default:
return fmt.Errorf("unknown encoder \"%s\"", e)
}
v.str = e
return nil
}
func (v encoderValue) String() string {
return v.str
}
func (v encoderValue) Type() string {
return "encoder"
}
func jsonEncoder() zapcore.Encoder {
encoderConfig := zap.NewProductionEncoderConfig()
return zapcore.NewJSONEncoder(encoderConfig)
}
func consoleEncoder() zapcore.Encoder {
encoderConfig := zap.NewDevelopmentEncoderConfig()
return zapcore.NewConsoleEncoder(encoderConfig)
}
type levelValue struct {
set bool
level zapcore.Level
}
func (v *levelValue) Set(l string) error {
v.set = true
lower := strings.ToLower(l)
var lvl int
switch lower {
case "debug":
lvl = -1
case "info":
lvl = 0
case "error":
lvl = 2
default:
i, err := strconv.Atoi(lower)
if err != nil {
return fmt.Errorf("invalid log level \"%s\"", l)
}
if i > 0 {
lvl = -1 * i
} else {
return fmt.Errorf("invalid log level \"%s\"", l)
}
}
v.level = zapcore.Level(int8(lvl))
// If log level is greater than debug, set glog/klog level to that level.
if lvl < -3 {
fs := flag.NewFlagSet("", flag.ContinueOnError)
klog.InitFlags(fs)
err := fs.Set("v", fmt.Sprintf("%v", -1*lvl))
if err != nil {
return err
}
}
return nil
}
func (v levelValue) String() string {
return v.level.String()
}
func (v levelValue) Type() string {
return "level"
}
type sampleValue struct {
set bool
sample bool
}
func (v *sampleValue) Set(s string) error {
var err error
v.set = true
v.sample, err = strconv.ParseBool(s)
return err
}
func (v sampleValue) String() string {
return strconv.FormatBool(v.sample)
}
func (v sampleValue) IsBoolFlag() bool {
return true
}
func (v sampleValue) Type() string {
return "sample"
}