fix: add addressing error example in examroom module (#130)

* address error example in examroom

api/model/api/login_data.go

@@ -18,17 +18,17 @@ package api
 
 import (
 	"context"
-	"errors"
 
 	"github.com/west2-online/fzuhelper-server/kitex_gen/model"
+	"github.com/west2-online/fzuhelper-server/pkg/errno"
 )
 
 var loginDataKey *model.LoginData
 
 func GetLoginData(ctx context.Context) (*model.LoginData, error) {
 	user, ok := FromContext(ctx)
 	if !ok {
-		return nil, errors.New("获取Header错误")
+		return nil, errno.ParamMissingHeader.WithMessage("Failed to get header in context")
 	}
 	return user, nil
 }

api/mw/get_header.go

@@ -26,6 +26,7 @@ import (
 	"github.com/west2-online/fzuhelper-server/api/pack"
 	"github.com/west2-online/fzuhelper-server/kitex_gen/model"
 	"github.com/west2-online/fzuhelper-server/pkg/errno"
+	"github.com/west2-online/fzuhelper-server/pkg/logger"
 )
 
 // GetHeaderParams 获取请求头的信息，处理 id 和 cookies 并附加到 Context 中
@@ -34,6 +35,7 @@ func GetHeaderParams() app.HandlerFunc {
 		id := string(c.GetHeader("id"))
 		temp := string(c.GetHeader("cookies"))
 		if id == "" || len(temp) == 0 {
+			logger.Errorf("GetHeaderParams: id or cookies is empty")
 			pack.RespError(c, errno.ParamMissingHeader)
 			c.Abort()
 			return

api/rpc/classroom.go

@@ -51,7 +51,7 @@ func GetExamRoomInfoRPC(ctx context.Context, req *classroom.ExamRoomInfoRequest)
 	resp, err := classroomClient.GetExamRoomInfo(ctx, req)
 	if err != nil {
 		logger.Errorf("GetExamRoomInfoRPC: RPC called failed: %v", err.Error())
-		return nil, errno.InternalServiceError.WithMessage(err.Error())
+		return nil, errno.InternalServiceError.WithMessage(err.Error()) // 不属于业务错误
 	}
 	if err = utils.HandleBaseRespWithCookie(resp.Base); err != nil {
 		return nil, err

pkg/utils/rpc.go

@@ -26,7 +26,7 @@ func IsSuccess(baseResp *model.BaseResp) bool {
 	return baseResp.Code == errno.SuccessCode
 }
 
-// HandleBaseRespWithCookie 调用jwch库的接口的结果处理
+// HandleBaseRespWithCookie 调用jwch库的接口的结果处理， 将 resp.Base 中包含的错误转换成 errno 类型
 func HandleBaseRespWithCookie(baseResp *model.BaseResp) error {
 	if baseResp.Code == errno.BizJwchCookieExceptionCode {
 		return errno.NewErrNo(baseResp.Code, baseResp.Msg)