add: chat service

app/chat/rpc/internal/logic/searchChatMessagesLogic.go

@@ -0,0 +1,58 @@
+package logic
+
+import (
+	"context"
+
+	"juwan-backend/app/chat/rpc/internal/svc"
+	"juwan-backend/app/chat/rpc/pb"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type SearchChatMessagesLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewSearchChatMessagesLogic(ctx context.Context, svcCtx *svc.ServiceContext) *SearchChatMessagesLogic {
+	return &SearchChatMessagesLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *SearchChatMessagesLogic) SearchChatMessages(in *pb.SearchChatMessagesReq) (*pb.SearchChatMessagesResp, error) {
+	store := l.svcCtx.Store
+	store.Mu.RLock()
+	defer store.Mu.RUnlock()
+
+	msgIDs := store.SessionMessages[in.GetSessionId()]
+	var results []*pb.ChatMessages
+	for _, id := range msgIDs {
+		msg, ok := store.Messages[id]
+		if !ok {
+			continue
+		}
+		if in.SenderId != nil && msg.SenderId != *in.SenderId {
+			continue
+		}
+		results = append(results, msg)
+	}
+
+	limit := in.GetLimit()
+	if limit <= 0 {
+		limit = 20
+	}
+	offset := in.GetPage() * limit
+	if offset >= int64(len(results)) {
+		return &pb.SearchChatMessagesResp{}, nil
+	}
+	end := offset + limit
+	if end > int64(len(results)) {
+		end = int64(len(results))
+	}
+
+	return &pb.SearchChatMessagesResp{ChatMessages: results[offset:end]}, nil
+}