1 files changed, 77 insertions, 0 deletions
diff --git a/backend/fetchers/cache.go b/backend/fetchers/cache.go
new file mode 100644
index 0000000..12c68a8
--- /dev/null
+++ b/backend/fetchers/cache.go
@@ -0,0 +1,77 @@
+package fetchers
+
+import (
+	"llostre/backend/notes"
+	"sync"
+	"time"
+)
+
+type CacheEntry struct {
+    Note      *notes.Note
+    ExpiresAt time.Time
+}
+
+type Cache struct {
+	posts map[string]*CacheEntry
+	mu    sync.RWMutex
+}
+
+func NewCache() *Cache {
+	return &Cache{
+		posts: make(map[string]*CacheEntry),
+	}
+}
+
+func (c *Cache) Get(uri string) (*notes.Note, bool) {
+    c.mu.Lock()
+    defer c.mu.Unlock()
+
+    entry, exists := c.posts[uri]
+
+    if !exists {
+        return nil, false
+    }
+
+    if time.Now().After(entry.ExpiresAt) {
+        delete(c.posts, uri)
+        return nil, false
+    }
+
+    return entry.Note, true
+}
+
+func (c *Cache) Set(uri string, note *notes.Note) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	ttl := time.Now().Add(15 * time.Minute)
+
+	c.posts[uri] = &CacheEntry{
+		Note: note,
+		ExpiresAt: ttl,
+	}
+}
+
+func (c *Cache) GetMany(uris []string) map[string]*notes.Note {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	result := make(map[string]*notes.Note)
+	now := time.Now()
+
+	for _, uri := range uris {
+		entry, exists := c.posts[uri]
+		if !exists {
+			continue
+		}
+
+		if now.After(entry.ExpiresAt) {
+			delete(c.posts, uri)
+			continue
+		}
+
+		result[uri] = entry.Note
+	}
+
+	return result
+}