feat: cron task

pkg/common/db/mgo/msg_del.go

@@ -0,0 +1,71 @@
+package mgo
+
+import (
+	"github.com/openimsdk/open-im-server/v3/pkg/common/db/table/relation"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+func NewMsgDelMongo(db *mongo.Database) *MsgDelMgo {
+	return &MsgDelMgo{coll: db.Collection(new(relation.MsgDocModel).TableName())}
+}
+
+type MsgDelMgo struct {
+	coll  *mongo.Collection
+	model relation.MsgDocModel
+}
+
+//func (m *MsgDelMgo) getEmptyMsg(ctx context.Context, limit int) ([]string, error) {
+//	return mongoutil.Aggregate[string](ctx, m.coll, []bson.M{
+//		{
+//			"$match": bson.M{
+//				"msgs": bson.M{
+//					"$exists": true,
+//				},
+//			},
+//		},
+//		{
+//			"$project": bson.M{
+//				"_id":    0,
+//				"doc_id": 1,
+//				"all_null_msgs": bson.M{
+//					"$not": []bson.M{
+//						{
+//							"$anyElementTrue": bson.M{
+//								"$map": bson.M{
+//									"input": "$msgs",
+//									"as":    "item",
+//									"in":    "$$item.msg",
+//								},
+//							},
+//						},
+//					},
+//				},
+//			},
+//		},
+//		{
+//			"$project": bson.M{
+//				"doc_id": 1,
+//			},
+//		},
+//		{
+//			"$limit": limit,
+//		},
+//	})
+//}
+//
+//func (m *MsgDelMgo) deleteEmptyMsgs(ctx context.Context) error {
+//	for {
+//		docIDs, err := m.getEmptyMsg(ctx, 100)
+//		if err != nil {
+//			return err
+//		}
+//		if len(docIDs) == 0 {
+//			return nil
+//		}
+//		for _, docID := range docIDs {
+//			if err := m.deleteEmptyMsg(ctx, docID); err != nil {
+//				return err
+//			}
+//		}
+//	}
+//}