Leveldb Counter

main.go

package main

import (
        "fmt"
        "os"

        "github.com/syndtr/goleveldb/leveldb"
        "github.com/syndtr/goleveldb/leveldb/opt"
)

func main() {
        opts := opt.Options{Compression: opt.NoCompression}

        db, err := leveldb.OpenFile(os.Args[1], &opts)
        defer db.Close()

        count := 0
        iter := db.NewIterator(nil, nil)
        for iter.Next() {
                count++
        }
        iter.Release()
        err = iter.Error()
        fmt.Printf("iterator error: %+v\n", err)
        fmt.Printf("count: %d\n", count)
}