def change_queue_core(self):
app = api.get_global_app()
index = 0
with app.background_dbconn() as conn:
conn.set_isolation_level(
psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
curs = conn.cursor()
# The channel string shall not be quoted in this context.
curs.execute(f"LISTEN {self.channel};")
while time.time() - self.last_check < 30:
if select.select([conn], [], [], 5) == ([], [], []):
pass # print(f"nothing; iterate {self.channel}")
else:
# print(f"poll it {self.channel}")
conn.poll()
while conn.notifies:
notify = conn.notifies.pop(0)
index += 1
node = (time.time(), index, notify.payload)
self.thislist.append(node)
self.event.set()
self.event.clear()
cutoff = time.time() - 60
for cut, chrow in enumerate(self.thislist):
if chrow[0] > cutoff:
self.thislist = self.thislist[cut:]
break
self.stop_change_queue(self.channel)
def poll_listener(request, channel):
key = request.query.get("key")
index = request.query.get("index", None)
index = 0 if index is None else int(index)
listener = Listener.start_change_queue(key, channel)
app = api.get_global_app()
results = api.Results()
with app.cancel_queue() as cancel:
# return anything since
results.tables["changes",
True] = listener.changes_since(cancel, index).as_tab2()
return results.json_out()
import yenot.backend.api as api
app = api.get_global_app()
@app.get("/api/ping", name="ping", skip=["yenot-auth"])
def ping():
return "."
@app.put("/api/request/cancel", name="api_request_cancel")
def api_request_cancel(request):
token = request.query.get("token")
app.cancel_request(token)
return api.Results().json_out()
