[PSL-1216] optimize multi-volume registration

Author: mateeullahmalik

walletnode/api/design/cascade.go

@@ -173,7 +173,7 @@ var _ = Service("cascade", func() {
 		Payload(func() {
 			Extend(DownloadTaskStatePayload)
 		})
-		Result(ArrayOf(TaskHistory))
+		Result(DownloadTaskStatus)
 
 		HTTP(func() {
 			GET("/downloads/{file_id}/status")

walletnode/api/design/common.go

@@ -72,8 +72,8 @@ var RegisterTaskPayload = Type("RegisterTaskPayload", func() {
 var DownloadTaskStatePayload = Type("DownloadTaskStatePayload", func() {
 	Attribute("file_id", String, "File ID returned by Download V2 API", func() {
 		TypeName("file_id")
-		MinLength(8)
-		MaxLength(8)
+		MinLength(6)
+		MaxLength(6)
 		Example("n6Qn6TFM")
 	})
 	Required("file_id")
@@ -128,6 +128,62 @@ var TaskHistory = Type("TaskHistory", func() {
 	Required("status")
 })
 
+// DownloadTaskStatus is status of the download task
+var DownloadTaskStatus = Type("DownloadTaskStatus", func() {
+	Attribute("total_volumes", Int, func() {
+		Description("Total Volumes")
+		Example(1)
+	})
+
+	Attribute("downloaded_volumes", Int, func() {
+		Description("Number of volumes successfully downloaded")
+		Example(1)
+	})
+
+	Attribute("volumes_download_in_progress", Int, func() {
+		Description("Number of volumes currently being downloaded")
+		Example(1)
+	})
+
+	Attribute("volumes_pending_download", Int, func() {
+		Description("Number of volumes awaiting schedule")
+		Example(1)
+	})
+
+	Attribute("volumes_download_failed", Int, func() {
+		Description("Number of volumes failed to download")
+		Example(1)
+	})
+
+	Attribute("task_status", String, func() {
+		Description("Status of the operation")
+		Example("In Progress")
+		Enum("Completed", "Failed", "In Progress")
+	})
+
+	Attribute("size_of_the_file_megabytes", Int, func() {
+		Description("size of the file in megabytes")
+		Example(1)
+	})
+
+	Attribute("data_downloaded_megabytes", Int, func() {
+		Description("data downloaded in megabytes so far")
+		Example(1)
+	})
+
+	Attribute("message", String, func() {
+		Description("message string (if any)")
+		Example("Balance less than maximum fee provied in the request, could not gather enough confirmations...")
+	})
+
+	Attribute("details", Details, func() {
+		Description("details of the status")
+	})
+
+	Required("total_volumes", "downloaded_volumes", "volumes_download_in_progress", "volumes_download_failed", "task_status", "details",
+		"volumes_pending_download", "size_of_the_file_megabytes", "data_downloaded_megabytes")
+})
+
 // ActionDetailsResult - result of posting action details
 var ActionDetailsResult = ResultType("application/sense.start-action", func() {
 	TypeName("actionDetailResult")