feat: added configuration center function (#3035)

Co-authored-by: aiden.ma <Aiden.ma@yijinin.com>

core/configcenter/unmarshaler.go

@@ -0,0 +1,46 @@
+package configurator
+
+import (
+	"sync"
+
+	"github.com/zeromicro/go-zero/core/conf"
+)
+
+type (
+	// unmarshalerRegistry is the registry for unmarshalers.
+	unmarshalerRegistry struct {
+		unmarshalers map[string]LoaderFn
+
+		mu sync.RWMutex
+	}
+
+	// LoaderFn is the function type for loading configuration.
+	LoaderFn func([]byte, any) error
+)
+
+var defaultRegistry *unmarshalerRegistry
+
+func init() {
+	defaultRegistry = &unmarshalerRegistry{
+		unmarshalers: map[string]LoaderFn{
+			"json": conf.LoadFromJsonBytes,
+			"toml": conf.LoadFromTomlBytes,
+			"yaml": conf.LoadFromYamlBytes,
+		},
+	}
+}
+
+// RegisterUnmarshaler registers an unmarshaler.
+func RegisterUnmarshaler(name string, fn LoaderFn) {
+	defaultRegistry.mu.Lock()
+	defaultRegistry.unmarshalers[name] = fn
+	defaultRegistry.mu.Unlock()
+}
+
+// Unmarshaler returns the unmarshaler by name.
+func Unmarshaler(name string) (LoaderFn, bool) {
+	defaultRegistry.mu.RLock()
+	fn, ok := defaultRegistry.unmarshalers[name]
+	defaultRegistry.mu.RUnlock()
+	return fn, ok
+}