feat: hltb plugin

internal/cache/cache.go

@@ -0,0 +1,83 @@
+package cache
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"git.nakama.town/fmartingr/butterrobot/internal/db"
+)
+
+// Cache provides a plugin-friendly interface to the cache system
+type Cache struct {
+	db       *db.Database
+	pluginID string
+}
+
+// New creates a new Cache instance for a specific plugin
+func New(database *db.Database, pluginID string) *Cache {
+	return &Cache{
+		db:       database,
+		pluginID: pluginID,
+	}
+}
+
+// Get retrieves a value from the cache
+func (c *Cache) Get(key string, destination interface{}) error {
+	// Create prefixed key
+	fullKey := c.createKey(key)
+
+	// Get from database
+	value, err := c.db.CacheGet(fullKey)
+	if err != nil {
+		return err
+	}
+
+	// Unmarshal JSON into destination
+	return json.Unmarshal([]byte(value), destination)
+}
+
+// Set stores a value in the cache with optional expiration
+func (c *Cache) Set(key string, value interface{}, expiration *time.Time) error {
+	// Create prefixed key
+	fullKey := c.createKey(key)
+
+	// Marshal value to JSON
+	jsonValue, err := json.Marshal(value)
+	if err != nil {
+		return fmt.Errorf("failed to marshal cache value: %w", err)
+	}
+
+	// Store in database
+	return c.db.CacheSet(fullKey, string(jsonValue), expiration)
+}
+
+// SetWithTTL stores a value in the cache with a time-to-live duration
+func (c *Cache) SetWithTTL(key string, value interface{}, ttl time.Duration) error {
+	expiration := time.Now().Add(ttl)
+	return c.Set(key, value, &expiration)
+}
+
+// Delete removes a value from the cache
+func (c *Cache) Delete(key string) error {
+	fullKey := c.createKey(key)
+	return c.db.CacheDelete(fullKey)
+}
+
+// Exists checks if a key exists in the cache
+func (c *Cache) Exists(key string) (bool, error) {
+	fullKey := c.createKey(key)
+	_, err := c.db.CacheGet(fullKey)
+	if err == db.ErrNotFound {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+// createKey creates a prefixed cache key
+func (c *Cache) createKey(key string) string {
+	return fmt.Sprintf("%s_%s", c.pluginID, key)
+}