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util.go
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util.go
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/*
Copyright 2018 The OpenEBS 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 util
import (
"crypto/md5"
"encoding/hex"
"fmt"
"os"
"strconv"
"strings"
"k8s.io/klog"
)
// truthyValues maps a set of values which are considered as true
var truthyValues = map[string]bool{
"1": true,
"YES": true,
"TRUE": true,
"OK": true,
}
// CheckTruthy checks for truthiness of the passed argument.
func CheckTruthy(truth string) bool {
return truthyValues[strings.ToUpper(truth)]
}
// falsyValues maps a set of values which are considered as false
var falsyValues = map[string]bool{
"0": true,
"NO": true,
"FALSE": true,
"BLANK": true,
}
// CheckFalsy checks for non-truthiness of the passed argument.
func CheckFalsy(falsy string) bool {
if len(falsy) == 0 {
falsy = "blank"
}
return falsyValues[strings.ToUpper(falsy)]
}
// CheckErr to handle command errors
func CheckErr(err error, handleErr func(string)) {
if err == nil {
return
}
handleErr(err.Error())
}
// Fatal prints the message (if provided) and then exits. If V(2) or greater,
// klog.Fatal is invoked for extended information.
func Fatal(msg string) {
if klog.V(2) {
klog.FatalDepth(2, msg)
}
if len(msg) > 0 {
// add newline if needed
if !strings.HasSuffix(msg, "\n") {
msg += "\n"
}
fmt.Fprint(os.Stderr, msg)
}
os.Exit(1)
}
// StringToInt32 converts a string type to corresponding
// *int32 type
func StringToInt32(val string) (*int32, error) {
if len(val) == 0 {
return nil, fmt.Errorf("Nil value to convert")
}
n, err := strconv.ParseInt(val, 10, 32)
if err != nil {
return nil, err
}
n32 := int32(n)
return &n32, nil
}
// StrToInt32 converts a string type to corresponding
// *int32 type
//
// NOTE:
// This swallows the error if any
func StrToInt32(val string) *int32 {
n32, _ := StringToInt32(val)
return n32
}
// Hash retrieves an encoded string using the md5 encrypt
func Hash(s string) string {
hasher := md5.New()
hasher.Write([]byte(s))
return hex.EncodeToString(hasher.Sum(nil))
}
// StateStatus returns enable if state is true and disable if state is false
func StateStatus(state bool) string {
var status = map[bool]string{
true: "enable",
false: "disable",
}
return status[state]
}