async def add_shared_ctx(request, **rv):
# add ctx vars needed to support fancy Vue.js stuff on logged-in pages
ses = await get_session(request)
rv.update(dict(
ws_url = '/websocket/' + ses.get('ws_token'),
STATUS=STATUS.as_dict(),
))
rv['CUR_PAGE'] = '/' + request.path.split('/')[-1]
return rv
async def push_status_updates_handler(ws):
# block for a bit, and then send display updates (and all other system status changes)
# - there is no need for immediate update because when we rendered the HTML on page
# load, we put in current values.
await asyncio.sleep(0.250)
last = None
while 1:
# get latest state
now = STATUS.as_dict()
if last != now:
# it has changed, so send it.
await ws.send_str(json_dumps(dict(vue_app_cb=dict(update_status=now))))
last = now
# wait until next update, or X seconds max (for keep alive/just in case)
try:
await asyncio.wait_for(STATUS._update_event.wait(), 120)
except asyncio.TimeoutError:
# force an update
last = None