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display preview error handling

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Chuck
2025-08-10 16:27:49 -05:00
parent bd7d136504
commit 6ff8d8b5af
2 changed files with 42 additions and 18 deletions
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41
web_interface_v2.py
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@@ -62,18 +62,28 @@ class DisplayMonitor:
try:
# Prefer service-provided snapshot if available (works when ledmatrix service is running)
if os.path.exists(snapshot_path):
# Read atomically by reopening; ignore partials by retrying once
# Read atomically by reopening; ignore partials by skipping this frame
img_bytes = None
for _ in range(2):
try:
with open(snapshot_path, 'rb') as f:
img_bytes = f.read()
break
except Exception:
socketio.sleep(0.02)
if not img_bytes:
raise RuntimeError('Snapshot read failed')
img_str = base64.b64encode(img_bytes).decode()
try:
with open(snapshot_path, 'rb') as f:
img_bytes = f.read()
except Exception:
img_bytes = None
if img_bytes:
img_str = base64.b64encode(img_bytes).decode()
# If we can infer dimensions from display_manager, include them; else leave 0
width = display_manager.width if display_manager else 0
height = display_manager.height if display_manager else 0
current_display_data = {
'image': img_str,
'width': width,
'height': height,
'timestamp': time.time()
}
socketio.emit('display_update', current_display_data)
# Yield and continue to next frame
socketio.sleep(0.1)
continue
# If we can infer dimensions from display_manager, include them; else leave 0
width = display_manager.width if display_manager else 0
height = display_manager.height if display_manager else 0
@@ -97,14 +107,15 @@ class DisplayMonitor:
}
socketio.emit('display_update', current_display_data)
except Exception as e:
logger.error(f"Display monitor error: {e}", exc_info=True)
except Exception:
# Swallow errors in the monitor loop to avoid log spam
pass
# Yield to the async loop; target ~5-10 FPS
try:
socketio.sleep(0.2)
socketio.sleep(0.1)
except Exception:
time.sleep(0.2)
time.sleep(0.1)
display_monitor = DisplayMonitor()