utils.go

package gochain

import (
    "crypto/rand"
    "crypto/sha256"
    "fmt"
)

func ComputeHashSha256(bytes []byte) string {
    return fmt.Sprintf("%x", sha256.Sum256(bytes))
}

func PseudoUUID() string {
    b := make([]byte, 16)
    _, err := rand.Read(b)
    if err != nil {
        fmt.Println("Error: ", err)
        return ""
    }

    return fmt.Sprintf("%X-%X-%X-%X-%X", b[0:4], b[4:6], b[6:8], b[8:10], b[10:])
}

func NewStringSet() StringSet {
    return StringSet{make(map[string]bool)}
}

type StringSet struct {
    set map[string]bool
}

func (set *StringSet) Add(str string) bool {
    _, found := set.set[str]
    set.set[str] = true
    return !found
}

func (set *StringSet) Keys() []string {
    var keys []string
    for k, _ := range set.set {
        keys = append(keys, k)
    }
    return keys
}