Gets the spent record from a btcd database for a transaction

getspent.go

package main

import (
	"encoding/hex"
	"fmt"
	"github.com/btcsuite/goleveldb/leveldb"
	"github.com/btcsuite/goleveldb/leveldb/opt"
)

func main() {
	txHash := "fa6764111c4784d8ff56371f88046dbdca34be434d6e5136f759b15efbced153"
	txKey, err := hex.DecodeString(txHash)
	if err != nil {
		fmt.Println("Error decoding hex hash:", err.Error())
		return
	}
	// Hash is stored backwards - WEIRD!
	for i := 0; i < 16; i++ {
		txKey[i], txKey[31-i] = txKey[31-i], txKey[i]
	}
	// Want the "spent" records
	txKey = append(txKey, byte('s'), byte('x'))
	options := opt.Options{
		BlockCacher:     opt.DefaultBlockCacher,
		Compression:     opt.NoCompression,
		OpenFilesCacher: opt.DefaultOpenFilesCacher,
	}
	ro := opt.ReadOptions{}
	db, err := leveldb.OpenFile(
		"/home/aakselrod/.btcd/data/testnet/blocks_leveldb",
		&options,
	)
	if err != nil {
		fmt.Println("Error opening DB:", err.Error())
		return
	}
	defer db.Close()
	buf, err := db.Get(txKey, &ro)
	if err != nil {
		fmt.Println("Error getting spent record for TX:", err.Error())
		return
	}
	fmt.Println(hex.EncodeToString(buf))
}