From 71b87437c7ce0deb262e7420ebc2531cdac16b26 Mon Sep 17 00:00:00 2001
From: Youen Toupin <youen.toupin@youb.fr>
Date: Sat, 9 Apr 2022 19:51:44 +0200
Subject: [PATCH] disabled mithril redraw for each status request

the goal is to allow each page to finely manage how to update with
minimum CPU usage
---
 WebApp/src/monitor-api.ts                     | 18 ++++++++++++++----
 WebApp/src/pages/dashboard/dashboard-page.tsx |  1 +
 WebApp/src/pages/raw-data/raw-data-page.tsx   |  1 +
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/WebApp/src/monitor-api.ts b/WebApp/src/monitor-api.ts
index 3441ded..e3e5c3a 100644
--- a/WebApp/src/monitor-api.ts
+++ b/WebApp/src/monitor-api.ts
@@ -45,11 +45,21 @@ export class MonitorApi {
 				t: Math.random() * 400 - 100,
 				alt: Math.random() * 4500000 - 200000
 			}
-			setTimeout(() => m.redraw(), 0);
 		} else {
-			apiStatus = await m.request({
-			    method: "GET",
-			    url: "/api/status"
+			apiStatus = await new Promise<ApiStatus>((resolve, error) => {
+				let request = new XMLHttpRequest();
+				request.onreadystatechange = () => {
+					if(request.readyState == 4) {
+						if(request.status == 200) {
+							resolve(JSON.parse(request.response));
+						}
+						else {
+							error();
+						}
+					}
+				};
+				request.open('GET', '/api/status', true);
+				request.send();
 			});
 		}
 		
diff --git a/WebApp/src/pages/dashboard/dashboard-page.tsx b/WebApp/src/pages/dashboard/dashboard-page.tsx
index 20855b2..555c321 100644
--- a/WebApp/src/pages/dashboard/dashboard-page.tsx
+++ b/WebApp/src/pages/dashboard/dashboard-page.tsx
@@ -18,6 +18,7 @@ export class DashboardPage extends Page {
 	
 	async refresh() {
 		this.status = await MonitorApi.get().fetchStatus();
+		// todo: update widgets (avoiding to use m.redraw which is a bit costly on CPU)
 		if(this.autoRefresh)
 			setTimeout(() => { if(this.autoRefresh) this.refresh(); }, 500);
 	}
diff --git a/WebApp/src/pages/raw-data/raw-data-page.tsx b/WebApp/src/pages/raw-data/raw-data-page.tsx
index 432b0ea..ba996c5 100644
--- a/WebApp/src/pages/raw-data/raw-data-page.tsx
+++ b/WebApp/src/pages/raw-data/raw-data-page.tsx
@@ -19,6 +19,7 @@ export class RawDataPage extends Page {
 	
 	async refresh() {
 		this.status = await MonitorApi.get().fetchStatus();
+		m.redraw();
 		if(this.autoRefresh)
 			setTimeout(() => { if(this.autoRefresh) this.refresh(); }, 500);
 	}