Catch errors on reload_markets

freqtrade/exchange/exchange.py

@@ -222,8 +222,11 @@ class Exchange(object):
                 > arrow.utcnow().timestamp):
             return None
         logger.debug("Performing scheduled market reload..")
-        self._api.load_markets(reload=True)
-        self._last_markets_refresh = arrow.utcnow().timestamp
+        try:
+            self._api.load_markets(reload=True)
+            self._last_markets_refresh = arrow.utcnow().timestamp
+        except ccxt.NetworkError:
+            logger.exception("Could not reload markets.")
 
     def validate_pairs(self, pairs: List[str]) -> None:
         """

freqtrade/tests/exchange/test_exchange.py

@@ -301,6 +301,20 @@ def test__reload_markets(default_conf, mocker, caplog):
     assert log_has('Performing scheduled market reload..', caplog.record_tuples)
 
 
+def test__reload_markets_exception(default_conf, mocker, caplog):
+    caplog.set_level(logging.DEBUG)
+
+    api_mock = MagicMock()
+    api_mock.load_markets = MagicMock(side_effect=ccxt.NetworkError)
+    default_conf['exchange']['markets_refresh_interval'] = 10
+    exchange = get_patched_exchange(mocker, default_conf, api_mock, id="binance")
+
+    # less than 10 minutes have passed, no reload
+    exchange._reload_markets()
+    assert exchange._last_markets_refresh == 0
+    assert log_has_re(r"Could not reload markets.*", caplog.record_tuples)
+
+
 def test_validate_pairs(default_conf, mocker):  # test exchange.validate_pairs directly
     api_mock = MagicMock()
     type(api_mock).markets = PropertyMock(return_value={