feat: 增加内存存储

internal/store/store.go

@@ -0,0 +1,33 @@
+package store
+
+import (
+	"errors"
+	"time"
+)
+
+// ErrNotFound is the error returned when a key is not found in the store.
+var ErrNotFound = errors.New("store: key not found")
+
+// Store is a generic key-value store interface.
+// Implementations of this interface must be safe for concurrent use.
+type Store interface {
+	// Set stores a key-value pair with an optional TTL.
+	// - key: The key (string).
+	// - value: The value ([]byte).
+	// - ttl: The expiration time. If ttl is 0, the key never expires.
+	Set(key string, value []byte, ttl time.Duration) error
+
+	// Get retrieves a value by its key.
+	// It must return store.ErrNotFound if the key does not exist.
+	Get(key string) ([]byte, error)
+
+	// Delete removes a value by its key.
+	// If the key does not exist, this operation should be considered successful (idempotent) and not return an error.
+	Delete(key string) error
+
+	// Exists checks if a key exists in the store.
+	Exists(key string) (bool, error)
+
+	// Close closes the store and releases any underlying resources.
+	Close() error
+}