feat: msg rpc local cache

pkg/rpccache/conversation.go

@@ -3,6 +3,7 @@ package rpccache
 import (
 	"context"
 	pbconversation "github.com/OpenIMSDK/protocol/conversation"
+	"github.com/OpenIMSDK/tools/errs"
 	"github.com/OpenIMSDK/tools/log"
 	"github.com/openimsdk/localcache"
 	"github.com/openimsdk/open-im-server/v3/pkg/common/cachekey"
@@ -69,3 +70,18 @@ func (c *ConversationLocalCache) GetSingleConversationRecvMsgOpt(ctx context.Con
 	}
 	return conv.RecvMsgOpt, nil
 }
+
+func (c *ConversationLocalCache) GetConversations(ctx context.Context, ownerUserID string, conversationIDs []string) ([]*pbconversation.Conversation, error) {
+	conversations := make([]*pbconversation.Conversation, 0, len(conversationIDs))
+	for _, conversationID := range conversationIDs {
+		conversation, err := c.GetConversation(ctx, ownerUserID, conversationID)
+		if err != nil {
+			if errs.ErrRecordNotFound.Is(err) {
+				continue
+			}
+			return nil, err
+		}
+		conversations = append(conversations, conversation)
+	}
+	return conversations, nil
+}