Golang Hashset Example

hashset.go

package main

import (
	"crypto"
	_ "crypto/sha512"
	"fmt"
)

func main() {

	knownApiKeys := [][]string{
		{
			"random-id-1",
			"random-token-1",
		},
		{
			"random-id-2",
			"random-token-2",
		},
	}

	// Build the hashset
	hashset := map[string]struct{}{}
	for _, k := range knownApiKeys {
		hashset[string(Hash(k))] = struct{}{}
	}

	// Check if a key is in the hashset
	testApiKeys := [][]string{
		// First key should be found
		{
			"random-id-1",
			"random-token-1",
		},
		// Second key should not be foun
		{
			"random-id-doesnotexist",
			"random-token-doesnotexist",
		},
	}

	for _, testkey := range testApiKeys {
		_, ok := hashset[Hash(testkey)]
		if ok {
			fmt.Println("Found match!")
		} else {
			fmt.Println("No match found, darn")
		}
	}
}

func Hash(objs ...interface{}) string {
	digester := crypto.SHA512.New()
	for _, ob := range objs {
		fmt.Fprint(digester, ob)
	}
	return string(digester.Sum(nil))
}