feat: 初始化配置中心项目

go-client/cache.go

@@ -0,0 +1,38 @@
+package client
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+const cacheFile = "config-cache.json"
+
+// Cache provides local file caching for configs
+type Cache struct {
+	dir string
+}
+
+func NewCache(dir string) *Cache {
+	return &Cache{dir: dir}
+}
+
+func (c *Cache) Write(data map[string]interface{}) error {
+	path := filepath.Join(c.dir, cacheFile)
+	bytes, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, bytes, 0644)
+}
+
+func (c *Cache) Read() (map[string]interface{}, error) {
+	path := filepath.Join(c.dir, cacheFile)
+	bytes, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	var data map[string]interface{}
+	err = json.Unmarshal(bytes, &data)
+	return data, err
+}