Initial commit

Proof-of-concept implementation. Bugs will occur.

internal/domains/cacher/cleanup.go

@@ -0,0 +1,37 @@
+package cacher
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+func (c *Cacher) cleanup() error {
+	for c.currentSize > c.maxSize && len(c.items) > 0 {
+		var (
+			itemKey    string
+			itemSize   int64
+			oldestTime time.Time
+		)
+
+		for key, item := range c.items {
+			if itemKey == "" || item.Updated.Before(oldestTime) {
+				itemKey = key
+				oldestTime = item.Updated
+				itemSize = item.Size
+			}
+		}
+
+		if itemKey != "" {
+			err := os.Remove(c.items[itemKey].Path)
+			if err != nil {
+				return fmt.Errorf("%w: %w (%w)", ErrCacher, ErrFailedToDeleteCachedFile, err)
+			}
+
+			delete(c.items, itemKey)
+			c.currentSize -= itemSize
+		}
+	}
+
+	return nil
+}