go get -u ./...; go mod tidy

vendor/github.com/hashicorp/golang-lru/LICENSE

@@ -1,3 +1,5 @@
+Copyright (c) 2014 HashiCorp, Inc.
+
 Mozilla Public License, version 2.0
 
 1. Definitions

vendor/github.com/hashicorp/golang-lru/simplelru/lru.go

@@ -25,7 +25,7 @@ type entry struct {
 // NewLRU constructs an LRU of the given size
 func NewLRU(size int, onEvict EvictCallback) (*LRU, error) {
 	if size <= 0 {
-		return nil, errors.New("Must provide a positive size")
+		return nil, errors.New("must provide a positive size")
 	}
 	c := &LRU{
 		size:      size,
@@ -73,6 +73,9 @@ func (c *LRU) Add(key, value interface{}) (evicted bool) {
 func (c *LRU) Get(key interface{}) (value interface{}, ok bool) {
 	if ent, ok := c.items[key]; ok {
 		c.evictList.MoveToFront(ent)
+		if ent.Value.(*entry) == nil {
+			return nil, false
+		}
 		return ent.Value.(*entry).value, true
 	}
 	return
@@ -106,7 +109,7 @@ func (c *LRU) Remove(key interface{}) (present bool) {
 }
 
 // RemoveOldest removes the oldest item from the cache.
-func (c *LRU) RemoveOldest() (key interface{}, value interface{}, ok bool) {
+func (c *LRU) RemoveOldest() (key, value interface{}, ok bool) {
 	ent := c.evictList.Back()
 	if ent != nil {
 		c.removeElement(ent)
@@ -117,7 +120,7 @@ func (c *LRU) RemoveOldest() (key interface{}, value interface{}, ok bool) {
 }
 
 // GetOldest returns the oldest entry
-func (c *LRU) GetOldest() (key interface{}, value interface{}, ok bool) {
+func (c *LRU) GetOldest() (key, value interface{}, ok bool) {
 	ent := c.evictList.Back()
 	if ent != nil {
 		kv := ent.Value.(*entry)
@@ -142,6 +145,19 @@ func (c *LRU) Len() int {
 	return c.evictList.Len()
 }
 
+// Resize changes the cache size.
+func (c *LRU) Resize(size int) (evicted int) {
+	diff := c.Len() - size
+	if diff < 0 {
+		diff = 0
+	}
+	for i := 0; i < diff; i++ {
+		c.removeOldest()
+	}
+	c.size = size
+	return diff
+}
+
 // removeOldest removes the oldest item from the cache.
 func (c *LRU) removeOldest() {
 	ent := c.evictList.Back()

vendor/github.com/hashicorp/golang-lru/simplelru/lru_interface.go

@@ -1,3 +1,4 @@
+// Package simplelru provides simple LRU implementation based on build-in container/list.
 package simplelru
 
 // LRUCache is the interface for simple LRU cache.
@@ -10,7 +11,7 @@ type LRUCache interface {
 	// updates the "recently used"-ness of the key. #value, isFound
 	Get(key interface{}) (value interface{}, ok bool)
 
-	// Check if a key exsists in cache without updating the recent-ness.
+	// Checks if a key exists in cache without updating the recent-ness.
 	Contains(key interface{}) (ok bool)
 
 	// Returns key's value without updating the "recently used"-ness of the key.
@@ -31,6 +32,9 @@ type LRUCache interface {
 	// Returns the number of items in the cache.
 	Len() int
 
-	// Clear all cache entries
+	// Clears all cache entries.
 	Purge()
+
+	// Resizes cache, returning number evicted
+	Resize(int) int
 }