"net/http/httptrace"
	"sync/atomic"
	"time"
)

var globalStats = struct {
	errs uint64

	tcpDialErrs                 uint64
	tcpDialCount                uint64
	tcpDialTotalDur             uint64
	tcpTimeForFirstByteTotalDur uint64
}{}

// RPCStats holds information about the DHCP/TCP metrics and errors
type RPCStats struct {
	Errs uint64

	DialAvgDuration uint64
	TTFBAvgDuration uint64
	DialErrs        uint64

		return errFileAccessDenied
	}

	if countErrs(errs, errDiskNotDir) == len(errs) {
		return errDiskNotDir
	}

	if countErrs(errs, errFaultyDisk) == len(errs) {
		return errFaultyDisk
	}

	if countErrs(errs, errXLBackend) == len(errs) {
		return errXLBackend
	}

	return nil
}

// A single function to write certain errors to be fatal

	workers    *workers.Workers
	errs       []NotificationPeerErr
	retryCount int
}

// WithNPeers returns a new NotificationGroup with length of errs slice upto nerrs,
// upon Wait() errors are returned collected from all tasks.
func WithNPeers(nerrs int) *NotificationGroup {
	if nerrs <= 0 {
		nerrs = 1
	}
	wk, _ := workers.New(nerrs)

	writers     []io.Writer
	writeQuorum int
	errs        []error
}

// Write writes data to writers.
func (p *multiWriter) Write(ctx context.Context, blocks [][]byte) error {
	for i := range p.writers {
		if p.errs[i] != nil {
			continue
		}
		if p.writers[i] == nil {
			p.errs[i] = errDiskNotFound
			continue
		}
		var n int
		n, p.errs[i] = p.writers[i].Write(blocks[i])
		if p.errs[i] == nil {

	// Merely for tracing storage
	path := ""
	if len(versions) > 0 {
		path = versions[0].Name
	}
	errs = make([]error, len(versions))
	ctx, done, err := p.TrackDiskHealth(ctx, storageMetricDeleteVersions, volume, path)
	if err != nil {
		for i := range errs {
			errs[i] = ctx.Err()
		}
		return errs
	}
	defer func() {

	deleteList := toNames(objectsToDelete)
	dObjects, errs := deleteObjectsFn(ctx, bucket, deleteList, ObjectOptions{
		PrefixEnabledFn:  vc.PrefixEnabled,
		VersionSuspended: vc.Suspended(),
	})

	// Are all objects saying bucket not found?
	if isAllBucketsNotFound(errs) {
		writeErrorResponse(ctx, w, toAPIError(ctx, errs[0]), r.URL)
		return
	}

	for i := range errs {

		}
		return ps
	}

	mkTest := func(N, parity, agree int) (res struct {
		metaArr  []FileInfo
		errs     []error
		parities []int
		parity   int
	},
	) {
		res.metaArr = mkMetaArr(N, parity, agree)
		res.parities = mkParities(N, N-(N/2+1), parity, agree)
		res.errs = make([]error, N)
		if agree >= N/2+1 { // simple majority consensus
			res.parity = N - (N/2 + 1)
		} else {

			meta, err := loadBucketMetadata(ctx, sys.objAPI, buckets[index])
			if err != nil {
				return err
			}
			bucketMetas[index] = meta
			return nil
		}, index)
	}

	errs := g.Wait()
	for index, err := range errs {
		if err != nil {
			internalLogOnceIf(ctx, fmt.Errorf("Unable to load bucket metadata, will be retried: %w", err),
				"load-bucket-metadata-"+buckets[index], logger.WarningKind)
		}
	}

		// Did not found anything useful
		return -1
	}
	return cparity
}

func listObjectParities(partsMetadata []FileInfo, errs []error) (parities []int) {
	totalShards := len(partsMetadata)
	parities = make([]int, len(partsMetadata))
	for index, metadata := range partsMetadata {
		if errs[index] != nil {
			parities[index] = -1
			continue
		}
		if !metadata.IsValid() {
			parities[index] = -1
			continue

	for {
		count := len(objsToDel)
		if count == 0 {
			break
		}
		if count > maxDeleteList {
			count = maxDeleteList
		}
		_, errs := api.DeleteObjects(ctx, r.Bucket, objsToDel[:count], opts)
		allErrs = append(allErrs, errs...)
		// Next batch of deletion
		objsToDel = objsToDel[count:]
	}

	return allErrs
}

const (
	batchExpireName                 = "batch-expire.bin"