You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/badger/integration/testgc
    
    the code of the file until where you have to start completion: package main

import (
	"encoding/binary"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	_ "net/http/pprof" //nolint:gosec
	"os"
	"sync"
	"sync/atomic"
	"time"

	"github.com/dgraph-io/badger/v4"
	"github.com/dgraph-io/badger/v4/y"
	"github.com/dgraph-io/ristretto/z"
)

var maxValue int64 = 10000000
var suffix = make([]byte, 128)

type testSuite struct {
	sync.Mutex
	vals map[uint64]uint64

	count atomic.Uint64 // Not under mutex lock.
}

func encoded(i uint64) []byte {
	out := make([]byte, 8)
	binary.BigEndian.PutUint64(out, i)
	return out
}

func (s *testSuite) write(db *badger.DB) error {
	return db.Update(func(txn *badger.Txn) error {
		for i := 0; i < 10; i++ {
			// These keys would be overwritten.
			keyi := uint64(rand.Int63n(maxValue))
			key := encoded(keyi)
			vali := s.count.Add(1)
			val := encoded(vali)
			val = append(val, suffix...)
			if err := txn.SetEntry(badger.NewEntry(key, val)); err != nil {
				return err
			}
		}
		for i := 0; i < 20; i++ {
			// These keys would be new and never overwritten.
			keyi := s.count.Add(1)
			if keyi%1000000 == 0 {
				log.Printf("Count: %d\n", keyi)
			}
			key := encoded(keyi)
			val := append(key, suffix...)
			if err := txn.SetEntry(badger.NewEntry(key, val)); err != nil {
				return err
			}
		}
		return nil
	})
}

func (s *testSuite) read(db *badger.DB) error {
	max := int64(s.count.Load())
	keyi := uint64(rand.Int63n(max))
	key := encoded(keyi)

	err := db.View(func(txn *badger.Txn) error {
		item, err := txn.Get(key)
		if err != n
    
func main() {
	fmt.Println("Badger Integration test for value log GC.")

	dir := "/mnt/drive/badgertest"
	os.RemoveAll(dir)

	db, err := badger.Open(badger.DefaultOptions(dir).
		WithSyncWrites(false))
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	go func() {
		_ = http.ListenAndServe("localhost:8080", nil)
	}()

	closer := z.NewCloser(11)
	go func() {
		// Run value log GC.
		defer closer.Done()
		var count int
		ticker := time.NewTicker(5 * time.Second)
		defer ticker.Stop()
		for range ticker.C {
		again:
			select {
			case <-closer.HasBeenClosed():
				log.Printf("Num times value log GC was successful: %d\n", count)
				return
			default:
			}
			log.Printf("Starting a value log GC")
			err := db.RunValueLogGC(0.1)
			log.Printf("Result of value log GC: %v\n", err)
			if err == nil {
				count++
				goto again
			}
		}
	}()

	s := testSuite{vals: make(map[uint64]uint64)}
	s.count.Store(uint64(maxValue))
	var numLoops atomic.Uint64
	ticker := time.NewTicker(5 * time.Second)
	for i := 0; i < 10; i++ {
		go func() {
			defer closer.Done()
			for {
				if err := s.write(db); err != nil {
					log.Fatal(err)
				}
				for j := 0; j < 10; j++ {
					if err := s.read(db); err != nil {
						log.Fatal(err)
					}
				}
				nl := numLoops.Add(1)
				select {
				case <-closer.HasBeenClosed():
					return
				case <-ticker.C:
					log.Printf("Num loops: %d\n", nl)
				default:
				}
			}
		}()
	}
	time.Sleep(5 * time.Minute)
	log.Println("Signaling...")
	closer.SignalAndWait()
	log.Println("Wait done. Now iterating over everything.")

	err = db.View(func(txn *badger.Txn) error {
		iopts := badger.DefaultIteratorOptions
		itr := txn.NewIterator(iopts)
		defer itr.Close()

		var total, tested int
		for itr.Rewind(); itr.Valid(); itr.Next() {
			item := itr.Item()
			key := item.Key()
			keyi := binary.BigEndian.Uint64(key)
			total++

			val, err := item.ValueCopy(nil)
			if err != nil {
				return err
			}
			if len(val) < 8 {
				log.Printf("Unexpected value: %x\n", val)
				continue
			}
			vali := binary.BigEndian.Uint64(val[0:8])

			expected, ok := s.vals[keyi] // Not all keys must be in vals map.
			if ok {
				tested++
				if vali < expected {
					// vali must be equal or greater than what's in the map.
					log.Fatalf("Expected: %d. Got: %d. Key: %d\n", expected, vali, keyi)
				}
			}
		}
		log.Printf("Total iterated: %d. Tested values: %d\n", total, tested)
		return nil
	})
	if err != nil {
		log.Fatalf("Error while iterating: %v", err)
	}
	log.Println("Iteration done. Test successful.")
	time.Sleep(time.Minute) // Time to do some poking around.
}