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131 changes: 131 additions & 0 deletions
131
images/storage-network-controller/src/pkg/cache/ttl_cache.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| Copyright 2024 Flant JSC | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package cache | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
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| // item represents a cache item with a value and an expiration time. | ||
| type item[V any] struct { | ||
| value V | ||
| expiry time.Time | ||
| } | ||
|
|
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| // isExpired checks if the cache item has expired. | ||
| func (i item[V]) isExpired() bool { | ||
| return time.Now().After(i.expiry) | ||
| } | ||
|
|
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| // TTLCache is a generic cache implementation with support for time-to-live | ||
| // (TTL) expiration. | ||
| type TTLCache[K comparable, V any] struct { | ||
| items map[K]item[V] // The map storing cache items. | ||
| mu sync.Mutex // Mutex for controlling concurrent access to the cache. | ||
| } | ||
|
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| // NewTTL creates a new TTLCache instance and starts a goroutine to periodically | ||
| // remove expired items every 5 seconds. | ||
| func NewTTL[K comparable, V any]() *TTLCache[K, V] { | ||
| c := &TTLCache[K, V]{ | ||
| items: make(map[K]item[V]), | ||
| } | ||
|
|
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| go func() { | ||
| for range time.Tick(5 * time.Second) { | ||
| c.mu.Lock() | ||
|
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| // Iterate over the cache items and delete expired ones. | ||
| for key, item := range c.items { | ||
| if item.isExpired() { | ||
| delete(c.items, key) | ||
| } | ||
| } | ||
|
|
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| c.mu.Unlock() | ||
| } | ||
| }() | ||
|
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| return c | ||
| } | ||
|
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| // Set adds a new item to the cache with the specified key, value, and | ||
| // time-to-live (TTL). | ||
| func (c *TTLCache[K, V]) Set(key K, value V, ttl time.Duration) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| c.items[key] = item[V]{ | ||
| value: value, | ||
| expiry: time.Now().Add(ttl), | ||
| } | ||
| } | ||
|
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| // Get retrieves the value associated with the given key from the cache. | ||
| func (c *TTLCache[K, V]) Get(key K) (V, bool) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| item, found := c.items[key] | ||
| if !found { | ||
| // If the key is not found, return the zero value for V and false. | ||
| return item.value, false | ||
| } | ||
|
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| if item.isExpired() { | ||
| // If the item has expired, remove it from the cache and return the | ||
| // value and false. | ||
| delete(c.items, key) | ||
| return item.value, false | ||
| } | ||
|
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| // Otherwise return the value and true. | ||
| return item.value, true | ||
| } | ||
|
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| // Remove removes the item with the specified key from the cache. | ||
| func (c *TTLCache[K, V]) Remove(key K) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| // Delete the item with the given key from the cache. | ||
| delete(c.items, key) | ||
| } | ||
|
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| // Pop removes and returns the item with the specified key from the cache. | ||
| func (c *TTLCache[K, V]) Pop(key K) (V, bool) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| item, found := c.items[key] | ||
| if !found { | ||
| // If the key is not found, return the zero value for V and false. | ||
| return item.value, false | ||
| } | ||
|
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| // If the key is found, delete the item from the cache. | ||
| delete(c.items, key) | ||
|
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| if item.isExpired() { | ||
| // If the item has expired, return the value and false. | ||
| return item.value, false | ||
| } | ||
|
|
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| // Otherwise return the value and true. | ||
| return item.value, true | ||
| } |
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