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util/lru: add Clear method

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Updates tailscale/corp#20109

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I751a669251a70f0134dd1540c19b274a97608a93
This commit is contained in:
Andrew Dunham 2024-05-17 19:50:28 -04:00
parent c56e0c4934
commit 47b3476eb7
2 changed files with 10 additions and 0 deletions
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6
util/lru/lru.go
View File

@ -68,6 +68,12 @@ func (c *Cache[K, V]) Set(key K, value V) {
} }
} }
// Clear removes all items from the cache.
func (c *Cache[K, V]) Clear() {
c.head = nil
c.lookup = nil
}
// Get looks up a key's value from the cache, returning either // Get looks up a key's value from the cache, returning either
// the value or the zero value if it not present. // the value or the zero value if it not present.
// //

4
util/lru/lru_test.go
View File

@ -47,6 +47,10 @@ func TestLRU(t *testing.T) {
if c.Contains(3) { if c.Contains(3) {
t.Errorf("contains 3; should not") t.Errorf("contains 3; should not")
} }
c.Clear()
if g, w := c.Len(), 0; g != w {
t.Errorf("Len = %d; want %d", g, w)
}
} }
func TestLRUDeleteCorruption(t *testing.T) { func TestLRUDeleteCorruption(t *testing.T) {