unsafe_string_to_bytes.go

import (
	"encoding/binary"

	"github.com/spaolacci/murmur3"
)

func UnsafeToBytes(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(&s))
}

func GetID(v string) int {
	h64 := murmur3.New64()

	rawBs := UnsafeToBytes(v)
	bs := make([]byte, len(rawBs))
	copy(bs, rawBs)
	if _, err := h64.Write(bs); err != nil {
		return -1
	}

	return int(binary.BigEndian.Uint64(h64.Sum(nil))) % 10
	
}

// GetID will throw panic several times in one day in my server's log

// PANIC: runtime error: slice bounds out of range [:9] with capacity 2
// .../vendor/github.com/spaolacci/murmur3/murmur.go:42 +0x378

// It make no sense panic here because there is bound check in Write
// https://github.com/spaolacci/murmur3/blob/master/murmur.go#L42