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misc.go
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misc.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package util
import (
cryptorand "crypto/rand"
"fmt"
"io"
"math/big"
"math/rand"
"reflect"
"runtime"
"sync"
"time"
"github.com/spf13/viper"
)
// Equals returns whether a and b are the same
type Equals func(a interface{}, b interface{}) bool
var viperLock sync.RWMutex
// Contains returns whether a given slice a contains a string s
func Contains(s string, a []string) bool {
for _, e := range a {
if e == s {
return true
}
}
return false
}
// IndexInSlice returns the index of given object o in array
func IndexInSlice(array interface{}, o interface{}, equals Equals) int {
arr := reflect.ValueOf(array)
for i := 0; i < arr.Len(); i++ {
if equals(arr.Index(i).Interface(), o) {
return i
}
}
return -1
}
func numbericEqual(a interface{}, b interface{}) bool {
return a.(int) == b.(int)
}
// GetRandomIndices returns a slice of random indices
// from 0 to given highestIndex
func GetRandomIndices(indiceCount, highestIndex int) []int {
if highestIndex+1 < indiceCount {
return nil
}
indices := make([]int, 0)
if highestIndex+1 == indiceCount {
for i := 0; i < indiceCount; i++ {
indices = append(indices, i)
}
return indices
}
for len(indices) < indiceCount {
n := RandomInt(highestIndex + 1)
if IndexInSlice(indices, n, numbericEqual) != -1 {
continue
}
indices = append(indices, n)
}
return indices
}
// Set is a generic and thread-safe
// set container
type Set struct {
items map[interface{}]struct{}
lock *sync.RWMutex
}
// NewSet returns a new set
func NewSet() *Set {
return &Set{lock: &sync.RWMutex{}, items: make(map[interface{}]struct{})}
}
// Add adds given item to the set
func (s *Set) Add(item interface{}) {
s.lock.Lock()
defer s.lock.Unlock()
s.items[item] = struct{}{}
}
// Exists returns true whether given item is in the set
func (s *Set) Exists(item interface{}) bool {
s.lock.RLock()
defer s.lock.RUnlock()
_, exists := s.items[item]
return exists
}
// Size returns the size of the set
func (s *Set) Size() int {
s.lock.RLock()
defer s.lock.RUnlock()
return len(s.items)
}
// ToArray returns a slice with items
// at the point in time the method was invoked
func (s *Set) ToArray() []interface{} {
s.lock.RLock()
defer s.lock.RUnlock()
a := make([]interface{}, len(s.items))
i := 0
for item := range s.items {
a[i] = item
i++
}
return a
}
// Clear removes all elements from set
func (s *Set) Clear() {
s.lock.Lock()
defer s.lock.Unlock()
s.items = make(map[interface{}]struct{})
}
// Remove removes a given item from the set
func (s *Set) Remove(item interface{}) {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.items, item)
}
// PrintStackTrace prints to stdout
// all goroutines
func PrintStackTrace() {
buf := make([]byte, 1<<16)
runtime.Stack(buf, true)
fmt.Printf("%s", buf)
}
// GetIntOrDefault returns the int value from config if present otherwise default value
func GetIntOrDefault(key string, defVal int) int {
viperLock.RLock()
defer viperLock.RUnlock()
if val := viper.GetInt(key); val != 0 {
return val
}
return defVal
}
// GetFloat64OrDefault returns the float64 value from config if present otherwise default value
func GetFloat64OrDefault(key string, defVal float64) float64 {
viperLock.RLock()
defer viperLock.RUnlock()
if val := viper.GetFloat64(key); val != 0 {
return val
}
return defVal
}
// GetDurationOrDefault returns the Duration value from config if present otherwise default value
func GetDurationOrDefault(key string, defVal time.Duration) time.Duration {
viperLock.RLock()
defer viperLock.RUnlock()
if val := viper.GetDuration(key); val != 0 {
return val
}
return defVal
}
// SetVal stores key value to viper
func SetVal(key string, val interface{}) {
viperLock.Lock()
defer viperLock.Unlock()
viper.Set(key, val)
}
// RandomInt returns, as an int, a non-negative pseudo-random integer in [0,n)
// It panics if n <= 0
func RandomInt(n int) int {
if n <= 0 {
panic(fmt.Sprintf("Got invalid (non positive) value: %d", n))
}
m := int(RandomUInt64()) % n
if m < 0 {
return n + m
}
return m
}
// RandomUInt64 returns a random uint64
func RandomUInt64() uint64 {
b := make([]byte, 8)
_, err := io.ReadFull(cryptorand.Reader, b)
if err == nil {
n := new(big.Int)
return n.SetBytes(b).Uint64()
}
rand.Seed(rand.Int63())
return uint64(rand.Int63())
}
func BytesToStrings(bytes [][]byte) []string {
strings := make([]string, len(bytes))
for i, b := range bytes {
strings[i] = string(b)
}
return strings
}
func StringsToBytes(strings []string) [][]byte {
bytes := make([][]byte, len(strings))
for i, str := range strings {
bytes[i] = []byte(str)
}
return bytes
}