vendor: update buildkit to master@31c870e82a48

Signed-off-by: Justin Chadwell <me@jedevc.com>

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

@@ -83,7 +83,7 @@ func (lim *Limiter) Burst() int {
 // TokensAt returns the number of tokens available at time t.
 func (lim *Limiter) TokensAt(t time.Time) float64 {
 	lim.mu.Lock()
-	_, _, tokens := lim.advance(t) // does not mutute lim
+	_, tokens := lim.advance(t) // does not mutate lim
 	lim.mu.Unlock()
 	return tokens
 }
@@ -183,7 +183,7 @@ func (r *Reservation) CancelAt(t time.Time) {
 		return
 	}
 	// advance time to now
-	t, _, tokens := r.lim.advance(t)
+	t, tokens := r.lim.advance(t)
 	// calculate new number of tokens
 	tokens += restoreTokens
 	if burst := float64(r.lim.burst); tokens > burst {
@@ -304,7 +304,7 @@ func (lim *Limiter) SetLimitAt(t time.Time, newLimit Limit) {
 	lim.mu.Lock()
 	defer lim.mu.Unlock()
 
-	t, _, tokens := lim.advance(t)
+	t, tokens := lim.advance(t)
 
 	lim.last = t
 	lim.tokens = tokens
@@ -321,7 +321,7 @@ func (lim *Limiter) SetBurstAt(t time.Time, newBurst int) {
 	lim.mu.Lock()
 	defer lim.mu.Unlock()
 
-	t, _, tokens := lim.advance(t)
+	t, tokens := lim.advance(t)
 
 	lim.last = t
 	lim.tokens = tokens
@@ -356,7 +356,7 @@ func (lim *Limiter) reserveN(t time.Time, n int, maxFutureReserve time.Duration)
 		}
 	}
 
-	t, last, tokens := lim.advance(t)
+	t, tokens := lim.advance(t)
 
 	// Calculate the remaining number of tokens resulting from the request.
 	tokens -= float64(n)
@@ -379,15 +379,11 @@ func (lim *Limiter) reserveN(t time.Time, n int, maxFutureReserve time.Duration)
 	if ok {
 		r.tokens = n
 		r.timeToAct = t.Add(waitDuration)
-	}
 
-	// Update state
-	if ok {
+		// Update state
 		lim.last = t
 		lim.tokens = tokens
 		lim.lastEvent = r.timeToAct
-	} else {
-		lim.last = last
 	}
 
 	return r
@@ -396,7 +392,7 @@ func (lim *Limiter) reserveN(t time.Time, n int, maxFutureReserve time.Duration)
 // 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(t time.Time) (newT time.Time, newLast time.Time, newTokens float64) {
+func (lim *Limiter) advance(t time.Time) (newT time.Time, newTokens float64) {
 	last := lim.last
 	if t.Before(last) {
 		last = t
@@ -409,7 +405,7 @@ func (lim *Limiter) advance(t time.Time) (newT time.Time, newLast time.Time, new
 	if burst := float64(lim.burst); tokens > burst {
 		tokens = burst
 	}
-	return t, last, tokens
+	return t, tokens
 }
 
 // durationFromTokens is a unit conversion function from the number of tokens to the duration

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

@@ -0,0 +1,67 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package rate
+
+import (
+	"sync"
+	"time"
+)
+
+// Sometimes will perform an action occasionally.  The First, Every, and
+// Interval fields govern the behavior of Do, which performs the action.
+// A zero Sometimes value will perform an action exactly once.
+//
+// # Example: logging with rate limiting
+//
+//	var sometimes = rate.Sometimes{First: 3, Interval: 10*time.Second}
+//	func Spammy() {
+//	        sometimes.Do(func() { log.Info("here I am!") })
+//	}
+type Sometimes struct {
+	First    int           // if non-zero, the first N calls to Do will run f.
+	Every    int           // if non-zero, every Nth call to Do will run f.
+	Interval time.Duration // if non-zero and Interval has elapsed since f's last run, Do will run f.
+
+	mu    sync.Mutex
+	count int       // number of Do calls
+	last  time.Time // last time f was run
+}
+
+// Do runs the function f as allowed by First, Every, and Interval.
+//
+// The model is a union (not intersection) of filters.  The first call to Do
+// always runs f.  Subsequent calls to Do run f if allowed by First or Every or
+// Interval.
+//
+// A non-zero First:N causes the first N Do(f) calls to run f.
+//
+// A non-zero Every:M causes every Mth Do(f) call, starting with the first, to
+// run f.
+//
+// A non-zero Interval causes Do(f) to run f if Interval has elapsed since
+// Do last ran f.
+//
+// Specifying multiple filters produces the union of these execution streams.
+// For example, specifying both First:N and Every:M causes the first N Do(f)
+// calls and every Mth Do(f) call, starting with the first, to run f.  See
+// Examples for more.
+//
+// If Do is called multiple times simultaneously, the calls will block and run
+// serially.  Therefore, Do is intended for lightweight operations.
+//
+// Because a call to Do may block until f returns, if f causes Do to be called,
+// it will deadlock.
+func (s *Sometimes) Do(f func()) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.count == 0 ||
+		(s.First > 0 && s.count < s.First) ||
+		(s.Every > 0 && s.count%s.Every == 0) ||
+		(s.Interval > 0 && time.Since(s.last) >= s.Interval) {
+		f()
+		s.last = time.Now()
+	}
+	s.count++
+}