refactor: dscache sync add datasource process hook (#2792)

Co-authored-by: jie210 <huangjie@flashcat.com>

dscache/sync.go

@@ -22,6 +22,8 @@ import (
 
 var FromAPIHook func()
 
+var DatasourceProcessHook func(items []datasource.DatasourceInfo) []datasource.DatasourceInfo
+
 func Init(ctx *ctx.Context, fromAPI bool) {
 	go getDatasourcesFromDBLoop(ctx, fromAPI)
 }
@@ -100,6 +102,10 @@ func getDatasourcesFromDBLoop(ctx *ctx.Context, fromAPI bool) {
 				atomic.StoreInt64(&PromDefaultDatasourceId, 0)
 			}
 
+			if DatasourceProcessHook != nil {
+				dss = DatasourceProcessHook(dss)
+			}
+
 			PutDatasources(dss)
 		} else {
 			FromAPIHook()