♻️ Refactor synchronization service

internal/syncer/resource/adapter.go

@@ -0,0 +1,61 @@
+package resource
+
+import (
+	"context"
+	"sort"
+	"voidraft/internal/syncer/snapshot"
+)
+
+// Adapter 描述单类资源的导出与应用能力。
+type Adapter interface {
+	Kind() string
+	Export(ctx context.Context) ([]snapshot.Record, error)
+	Apply(ctx context.Context, records []snapshot.Record) error
+}
+
+// Registry 聚合所有资源适配器，并实现快照导入导出接口。
+type Registry struct {
+	adapters []Adapter
+}
+
+// NewRegistry 创建新的资源注册表。
+func NewRegistry(adapters ...Adapter) *Registry {
+	return &Registry{adapters: adapters}
+}
+
+// Export 导出所有已注册资源的快照。
+func (r *Registry) Export(ctx context.Context) (*snapshot.Snapshot, error) {
+	snap := snapshot.New()
+
+	for _, adapter := range r.adapters {
+		records, err := adapter.Export(ctx)
+		if err != nil {
+			return nil, err
+		}
+		if len(records) == 0 {
+			continue
+		}
+		sort.Slice(records, func(i int, j int) bool {
+			return records[i].ID < records[j].ID
+		})
+		snap.Resources[adapter.Kind()] = records
+	}
+
+	return snap, nil
+}
+
+// Apply 将快照内容应用到本地资源。
+func (r *Registry) Apply(ctx context.Context, snap *snapshot.Snapshot) error {
+	if snap == nil {
+		return nil
+	}
+
+	for _, adapter := range r.adapters {
+		records := snap.Resources[adapter.Kind()]
+		if err := adapter.Apply(ctx, records); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}