refact(deps): bump k8s and client-go deps to version v0.20.2 (#294)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/golang.org/x/time/rate/rate.go

@@ -53,10 +53,9 @@ func Every(interval time.Duration) Limit {
 //
 // The methods AllowN, ReserveN, and WaitN consume n tokens.
 type Limiter struct {
-	limit Limit
-	burst int
-
 	mu     sync.Mutex
+	limit  Limit
+	burst  int
 	tokens float64
 	// last is the last time the limiter's tokens field was updated
 	last time.Time
@@ -76,6 +75,8 @@ func (lim *Limiter) Limit() Limit {
 // Burst values allow more events to happen at once.
 // A zero Burst allows no events, unless limit == Inf.
 func (lim *Limiter) Burst() int {
+	lim.mu.Lock()
+	defer lim.mu.Unlock()
 	return lim.burst
 }
 
@@ -196,7 +197,7 @@ func (lim *Limiter) Reserve() *Reservation {
 
 // ReserveN returns a Reservation that indicates how long the caller must wait before n events happen.
 // The Limiter takes this Reservation into account when allowing future events.
-// ReserveN returns false if n exceeds the Limiter's burst size.
+// The returned Reservation’s OK() method returns false if n exceeds the Limiter's burst size.
 // Usage example:
 //   r := lim.ReserveN(time.Now(), 1)
 //   if !r.OK() {
@@ -223,8 +224,13 @@ func (lim *Limiter) Wait(ctx context.Context) (err error) {
 // canceled, or the expected wait time exceeds the Context's Deadline.
 // The burst limit is ignored if the rate limit is Inf.
 func (lim *Limiter) WaitN(ctx context.Context, n int) (err error) {
-	if n > lim.burst && lim.limit != Inf {
-		return fmt.Errorf("rate: Wait(n=%d) exceeds limiter's burst %d", n, lim.burst)
+	lim.mu.Lock()
+	burst := lim.burst
+	limit := lim.limit
+	lim.mu.Unlock()
+
+	if n > burst && limit != Inf {
+		return fmt.Errorf("rate: Wait(n=%d) exceeds limiter's burst %d", n, burst)
 	}
 	// Check if ctx is already cancelled
 	select {
@@ -281,6 +287,23 @@ func (lim *Limiter) SetLimitAt(now time.Time, newLimit Limit) {
 	lim.limit = newLimit
 }
 
+// SetBurst is shorthand for SetBurstAt(time.Now(), newBurst).
+func (lim *Limiter) SetBurst(newBurst int) {
+	lim.SetBurstAt(time.Now(), newBurst)
+}
+
+// SetBurstAt sets a new burst size for the limiter.
+func (lim *Limiter) SetBurstAt(now time.Time, newBurst int) {
+	lim.mu.Lock()
+	defer lim.mu.Unlock()
+
+	now, _, tokens := lim.advance(now)
+
+	lim.last = now
+	lim.tokens = tokens
+	lim.burst = newBurst
+}
+
 // reserveN is a helper method for AllowN, ReserveN, and WaitN.
 // maxFutureReserve specifies the maximum reservation wait duration allowed.
 // reserveN returns Reservation, not *Reservation, to avoid allocation in AllowN and WaitN.
@@ -337,6 +360,7 @@ func (lim *Limiter) reserveN(now time.Time, n int, maxFutureReserve time.Duratio
 
 // advance calculates and returns an updated state for lim resulting from the passage of time.
 // lim is not changed.
+// advance requires that lim.mu is held.
 func (lim *Limiter) advance(now time.Time) (newNow time.Time, newLast time.Time, newTokens float64) {
 	last := lim.last
 	if now.Before(last) {
@@ -370,5 +394,9 @@ func (limit Limit) durationFromTokens(tokens float64) time.Duration {
 // tokensFromDuration is a unit conversion function from a time duration to the number of tokens
 // which could be accumulated during that duration at a rate of limit tokens per second.
 func (limit Limit) tokensFromDuration(d time.Duration) float64 {
-	return d.Seconds() * float64(limit)
+	// Split the integer and fractional parts ourself to minimize rounding errors.
+	// See golang.org/issues/34861.
+	sec := float64(d/time.Second) * float64(limit)
+	nsec := float64(d%time.Second) * float64(limit)
+	return sec + nsec/1e9
 }