[+] improve periodic processing

deps/test-task-2025-06-30-v1/python/online/fxreader/pr34/test_task_2025_06_30_v1/tickers_retrieval/emcont.py

@@ -94,16 +94,21 @@ class Emcont:
 		only_symbols: Optional[set[str]] = None,
 		request_timeout: float | int = 0.5,
 		store_timeout: float | int = 0.5,
+		request_period: float | int = 1,
 	) -> None:
 		last_retrieval = datetime.datetime.now()
 
 		assert request_timeout >= 0
 		assert store_timeout >= 0
 
+		request_period_timedelta = datetime.timedelta(
+			seconds=request_timeout
+		)
+
 		while True:
 			logger.info(dict(msg='started'))
 
-			entries : Optional[cls.rates_get_t.data_t] = None
+			entries : Optional['Emcont.rates_get_t.data_t'] = None
 
 			try:
 				try:
@@ -127,13 +132,27 @@ class Emcont:
 			except:
 				logger.exception('')
 
-			next_retrieval = last_retrieval + datetime.timedelta(seconds=1)
+			next_retrieval = last_retrieval
 
-			wait_interval = (
-				next_retrieval - datetime.datetime.now()
-			).total_seconds()
+			def wait_interval():
+				return (
+					next_retrieval - datetime.datetime.now()
+				).total_seconds()
 
-			if wait_interval > 0:
-				await asyncio.sleep(wait_interval)
+			while True:
+				next_retrieval += request_period_timedelta
+
+				if (
+					wait_interval() > 0 or
+					wait_interval() > request_period_timedelta.total_seconds() / 4
+				):
+					break
+				else:
+					logger.warning(dict(
+						msg='skip period due to huge lag',
+					))
+
+			if wait_interval() > 0:
+				await asyncio.sleep(wait_interval())
 
 			last_retrieval = next_retrieval