"fmt"
	"sync"

	"istio.io/istio/pilot/cmd/pilot-agent/status/ready"
	"istio.io/istio/pkg/file"
	"istio.io/istio/pkg/istio-agent/grpcxds"
)

var _ ready.Prober = &probe{}

type probe struct {
	sync.RWMutex
	bootstrapPath string
	bootstrap     *grpcxds.Bootstrap
}

// NewProbe returns a probe that checks if a valid bootstrap file can be loaded once.

		return nil, err
	}
	return ms, nil
}

func (ms *MetadataServer) setToken(t string) {
	ms.mutex.Lock()
	defer ms.mutex.Unlock()
	ms.credential = t
}

// NumGetTokenCall returns the number of token fetching request.
func (ms *MetadataServer) NumGetTokenCall() int {
	ms.mutex.RLock()
	defer ms.mutex.RUnlock()

	return ms.numGetTokenCall
}

// Reset resets members to default values.

func (w *Watcher) AddWatcher() (int32, chan struct{}) {
	ch := make(chan struct{}, 1)
	w.mutex.Lock()
	defer w.mutex.Unlock()
	id := w.watcherID
	w.watchers[id] = ch
	w.watcherID++

	return id, ch
}

// RemoveWatcher removes the given watcher.
func (w *Watcher) RemoveWatcher(id int32) {
	w.mutex.Lock()
	defer w.mutex.Unlock()
	ch := w.watchers[id]
	if ch != nil {
		close(ch)
	}
	delete(w.watchers, id)

}

func (sl *streamListener) newLocalServer() *localServer {
	return &localServer{Listener: sl.Listener, done: make(chan bool)}
}

type dualStackServer struct {
	lnmu sync.RWMutex
	lns  []streamListener
	port string

	cmu sync.RWMutex
	cs  []Conn // established connections at the passive open side
}

func (dss *dualStackServer) buildup(handler func(*dualStackServer, Listener)) error {
	for i := range dss.lns {

			return features.EnableEnvoyFilterMetrics
		}),
	)
)

var (
	envoyFilterStatusMap = map[string]map[string]bool{} // Map of Envoy filter name, patch and status.
	envoyFilterMutex     sync.RWMutex
)

// IncrementEnvoyFilterMetric increments filter metric.
func IncrementEnvoyFilterMetric(name string, pt PatchType, applied bool) {
	if !features.EnableEnvoyFilterMetrics {
		return
	}
	envoyFilterMutex.Lock()

	"testing"
	"time"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/wait"
)

func TestTolerateBootstrapFailure(t *testing.T) {
	var fakeGetSucceed bool
	var fakeGetSucceedLock sync.RWMutex
	fakeGetFn := func() (runtime.Object, error) {
		fakeGetSucceedLock.RLock()
		defer fakeGetSucceedLock.RUnlock()
		if fakeGetSucceed {
			return nil, nil
		} else {

	currentS3Requests *HTTPAPIStats
	totalS3Requests   *HTTPAPIStats
	totalS34xxErrors  *HTTPAPIStats
	totalS35xxErrors  *HTTPAPIStats
	totalS3Canceled   *HTTPAPIStats
}

type bucketHTTPStats struct {
	sync.RWMutex
	httpStats map[string]bucketHTTPAPIStats
}

func newBucketHTTPStats() *bucketHTTPStats {
	return &bucketHTTPStats{
		httpStats: make(map[string]bucketHTTPAPIStats),
	}
}

	"sync"
	"time"

	"istio.io/istio/pkg/cache"
)

type cacheDB struct {
	// updatedNodes that have will be flushed to disk
	updatedNodes byteCache
	// updatedMux is a lock for updatedNodes
	updatedMux sync.RWMutex
}

// byteCache implements a modified ExpiringCache interface, returning byte arrays
// for ease of integration with smt calls.
type byteCache struct {
	cache cache.ExpiringCache
}

var (
	// Guard the forking variable.
	forkingLock sync.Mutex
	// Number of goroutines currently forking, and thus the
	// number of goroutines holding a conceptual write lock
	// on ForkLock.
	forking int
)

// hasWaitingReaders reports whether any goroutine is waiting
// to acquire a read lock on rw. It is defined in the sync package.
func hasWaitingReaders(rw *sync.RWMutex) bool

// acquireForkLock acquires a write lock on ForkLock.

}

// unixStat keeps a statistic how many requests were dropped within
// a single second.
type unixStat struct {
	unixTime int64
	requests int64
}

type droppedRequestsStats struct {
	lock sync.RWMutex

	// history stores the history of dropped requests.
	history []unixStat

	// To reduce lock-contention, we store the information about
	// the current second here, which we can then access under
	// reader lock.