Add quota and limit for events

Signed-off-by: Asai Neko <sugar@sne.moe>

api/event/join.go

@@ -20,7 +20,7 @@ import (
 //	@Success		200				{object}	utils.RespStatus{data=nil}	"Successfully joined the event"
 //	@Failure		400				{object}	utils.RespStatus{data=nil}	"Invalid Input or UUID Parse Failed"
 //	@Failure		401				{object}	utils.RespStatus{data=nil}	"Missing User ID / Unauthorized"
-//	@Failure		403				{object}	utils.RespStatus{data=nil}	"Unauthorized / Missing User ID"
+//	@Failure		403				{object}	utils.RespStatus{data=nil}	"Unauthorized / Missing User ID / Event Limit Exceeded"
 //	@Failure		500				{object}	utils.RespStatus{data=nil}	"Internal Server Error / Database Error"
 //	@Security		ApiKeyAuth
 //	@Router			/event/join [post]

cmd/gen_exception/definitions/specific.yaml

@@ -36,6 +36,7 @@ event:
         database_failed: "00001"
     join:
         event_invalid: "00001"
+        limit_exceeded: "00002"
     attendance:
         list_error: "00001"
         kyc_info_decrypt_failed: "00002"

data/attendance.go

@@ -141,6 +141,21 @@ func (self *Attendance) GetAttendanceListByEventId(ctx context.Context, eventId
 	return &result, err
 }
 
+func (self *Attendance) CountUsersByEventID(ctx context.Context, eventID uuid.UUID) (int64, error) {
+	var count int64
+
+	err := Database.WithContext(ctx).
+		Model(&Attendance{}).
+		Where("event_id = ?", eventID).
+		Count(&count).Error
+
+	if err != nil {
+		return 0, err
+	}
+
+	return count, nil
+}
+
 func (self *Attendance) Update(ctx context.Context, attendanceId uuid.UUID) (*Attendance, error) {
 	var attendance Attendance
 

data/event.go

@@ -20,6 +20,8 @@ type Event struct {
 	Thumbnail   string    `json:"thumbnail" gorm:"type:varchar(255)"`
 	Owner       uuid.UUID `json:"owner" gorm:"type:uuid;index;not null"`
 	EnableKYC   bool      `json:"enable_kyc" gorm:"not null"`
+	Quota       int64     `json:"quota" gorm:"not null"`
+	Limit       int64     `json:"limit" gorm:"not null"`
 }
 
 type EventIndexDoc struct {

service/service_event/join_event.go

@@ -153,8 +153,44 @@ func (self *EventServiceImpl) JoinEvent(payload *EventJoinPayload) (result *Even
 
 	attendenceData.SetUserId(userId)
 	attendenceData.SetEventId(eventId)
-	attendenceData.SetRole("notmal")
-	attendenceData.SetState("success")
+	attendenceCount, err := attendenceData.CountUsersByEventID(payload.Context, eventId)
+	if err != nil {
+		return &EventJoinResult{
+			Common: shared.CommonResult{
+				HttpCode: 500,
+				Exception: new(exception.Builder).
+					SetStatus(exception.StatusServer).
+					SetService(exception.ServiceEvent).
+					SetEndpoint(exception.EndpointEventServiceJoin).
+					SetType(exception.TypeCommon).
+					SetOriginal(exception.CommonErrorDatabase).
+					SetError(err).
+					Throw(payload.Context),
+			},
+		}
+	}
+
+	if attendenceCount >= eventData.Quota {
+		if attendenceCount >= eventData.Limit {
+			return &EventJoinResult{
+				Common: shared.CommonResult{
+					HttpCode: 403,
+					Exception: new(exception.Builder).
+						SetStatus(exception.StatusUser).
+						SetService(exception.ServiceEvent).
+						SetEndpoint(exception.EndpointEventServiceJoin).
+						SetType(exception.TypeSpecific).
+						SetOriginal(exception.EventJoinLimitExceeded).
+						SetError(errors.New("event limit exceeded")).
+						Throw(payload.Context),
+				},
+			}
+		}
+		attendenceData.SetState("out_of_limit")
+	} else {
+		attendenceData.SetState("success")
+	}
+	attendenceData.SetRole("normal")
 
 	err = attendenceData.Create(payload.Context)
 	if err != nil {