}

// IsOnline - returns whether client failed to connect or not.
func (client *storageRESTClient) IsOnline() bool {
	return client.restClient.IsOnline() || client.IsOnlineWS()
}

// IsOnlineWS - returns whether websocket client failed to connect or not.
func (client *storageRESTClient) IsOnlineWS() bool {
	return client.gridConn.State() == grid.StateConnected
}

	Get(ctx context.Context, object string, rv remoteVersionID, opts WarmBackendGetOpts) (io.ReadCloser, error)
	Remove(ctx context.Context, object string, rv remoteVersionID) error
	InUse(ctx context.Context) (bool, error)
}

const probeObject = "probeobject"

// checkWarmBackend checks if tier config credentials have sufficient privileges
// to perform all operations defined in the WarmBackend interface.

// See SetSkipTierVersion for its purpose.
func (fi *FileInfo) SkipTierFreeVersion() bool {
	_, ok := fi.Metadata[ReservedMetadataPrefixLower+tierSkipFVID]
	return ok
}

// TierFreeVersion returns true if version is a free-version.
func (fi *FileInfo) TierFreeVersion() bool {
	_, ok := fi.Metadata[ReservedMetadataPrefixLower+tierFVMarker]
	return ok
}

type objSweeper struct {
	Object              string
	Bucket              string
	VersionID           string // version ID set by application, applies only to DeleteObject and DeleteObjects APIs
	Versioned           bool
	Suspended           bool
	TransitionStatus    string
	TransitionTier      string
	TransitionVersionID string
	RemoteObject        string
}

// newObjSweeper returns an objSweeper for a given bucket and object.

	oldCache    dataUsageCache
	newCache    dataUsageCache
	updateCache dataUsageCache

	dataUsageScannerDebug bool
	healObjectSelect      uint32 // Do a heal check on an object once every n cycles. Must divide into healFolderInclude
	scanMode              madmin.HealScanMode

	weSleep    func() bool
	shouldHeal func() bool

	disks       []StorageAPI
	disksQuorum int

	// If set updates will be sent regularly to this channel.

import (
	"bytes"
	"fmt"
	"strconv"
	"strings"
	"time"
)

// hasNUL reports whether the NUL character exists within s.
func hasNUL(s string) bool {
	return strings.Contains(s, "\x00")
}

// isASCII reports whether the input is an ASCII C-style string.
func isASCII(s string) bool {
	for _, c := range s {
		if c >= 0x80 || c == 0x00 {
			return false
		}
	}
	return true
}

func (config *TierConfigMgr) isTierNameInUse(tierName string) (madmin.TierType, bool) {
	if t, ok := config.Tiers[tierName]; ok {
		return t.Type, true
	}
	return madmin.Unsupported, false
}

// Add adds tier to config if it passes all validations.
func (config *TierConfigMgr) Add(ctx context.Context, tier madmin.TierConfig, ignoreInUse bool) error {
	config.Lock()
	defer config.Unlock()

func isMaxObjectSize(size int64) bool {
	return size > globalMaxObjectSize
}

// Check if part size is more than or equal to minimum allowed size.
func isMinAllowedPartSize(size int64) bool {
	return size >= globalMinPartSize
}

// isMaxPartNumber - Check if part ID is greater than the maximum allowed ID.
func isMaxPartID(partID int) bool {
	return partID > globalMaxPartID
}

func (b metacacheBlock) pastPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.First, prefix) {
		return false
	}
	// We have checked if prefix matches, so we can do direct compare.
	return b.First > prefix
}

// endedPrefix returns true if the given prefix ends within the block.
func (b metacacheBlock) endedPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.Last, prefix) {

func c5(*gorm.DB) {}
func c6(*gorm.DB) {}

func TestCallbacks(t *testing.T) {
	type callback struct {
		name    string
		before  string
		after   string
		remove  bool
		replace bool
		err     string
		match   func(*gorm.DB) bool
		h       func(*gorm.DB)
	}

	datas := []struct {
		callbacks []callback
		err       string
		results   []string
	}{
		{