add: chat service

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

@@ -0,0 +1,38 @@
+package logic
+
+import (
+	"context"
+	"errors"
+
+	"juwan-backend/app/chat/rpc/internal/svc"
+	"juwan-backend/app/chat/rpc/pb"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetChatMessagesByIdLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetChatMessagesByIdLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetChatMessagesByIdLogic {
+	return &GetChatMessagesByIdLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *GetChatMessagesByIdLogic) GetChatMessagesById(in *pb.GetChatMessagesByIdReq) (*pb.GetChatMessagesByIdResp, error) {
+	store := l.svcCtx.Store
+	store.Mu.RLock()
+	defer store.Mu.RUnlock()
+
+	msg, ok := store.Messages[in.GetId()]
+	if !ok {
+		return nil, errors.New("message not found")
+	}
+
+	return &pb.GetChatMessagesByIdResp{ChatMessages: msg}, nil
+}