fix(handlers): avoid "Set changed size during iteration" in monitor loop (#57)

Iterate over list(connections) when broadcasting so the set is not
modified during iteration when a client disconnects.

Co-authored-by: Panos <>

Author: psalias2006

core/handlers.py

@@ -117,16 +117,14 @@ async def monitor_loop(monitor, connections):
                 'system': system_info
             }
 
-            # Send to all connected clients
+            # Send to all connected clients (iterate over copy to avoid "Set changed size during iteration")
             if connections:
                 disconnected = set()
-                for websocket in connections:
+                for websocket in list(connections):
                     try:
                         await websocket.send_text(json.dumps(data))
-                    except:
+                    except Exception:
                         disconnected.add(websocket)
-                
-                # Remove disconnected clients
                 connections -= disconnected
 
         except Exception as e:

static/css/components.css

@@ -434,14 +434,24 @@
 
 .sparkline-canvas-wrap {
     height: 90px;
+    min-height: 90px;
+    max-height: 90px;
     position: relative;
     overflow: hidden;
 }
 
+/* Constrain Chart.js wrapper and canvas so they cannot grow (fixes canvas height runaway) */
+.sparkline-canvas-wrap > div {
+    height: 100% !important;
+    max-height: 90px !important;
+    min-height: 0;
+}
+
 .sparkline-canvas-wrap canvas {
     display: block !important;
     width: 100% !important;
     height: 100% !important;
+    max-height: 90px !important;
 }
 
 /* ============================================

static/js/chart-manager.js

@@ -274,7 +274,7 @@ function initGPUCharts(gpuId) {
 
         const ctx = canvas.getContext('2d');
         const rect = canvas.parentElement.getBoundingClientRect();
-        const h = rect.height || 120;
+        const h = (rect.height > 0 ? rect.height : 90);
         const gradient = ctx.createLinearGradient(0, 0, 0, h);
         gradient.addColorStop(0, 'rgba(255, 255, 255, 0.06)');
         gradient.addColorStop(1, 'rgba(255, 255, 255, 0.0)');

version.py

@@ -1,4 +1,4 @@
 """Version information for GPU Hot"""
 
-__version__ = "1.7.1"
+__version__ = "1.7.2"