Load correct exchange class

closes #2371

freqtrade/exchange/__init__.py

@@ -1,4 +1,4 @@
-from freqtrade.exchange.exchange import Exchange  # noqa: F401
+from freqtrade.exchange.exchange import Exchange, MAP_EXCHANGE_CHILDCLASS  # noqa: F401
 from freqtrade.exchange.exchange import (get_exchange_bad_reason,  # noqa: F401
                                          is_exchange_bad,
                                          is_exchange_known_ccxt,

freqtrade/exchange/exchange.py

@@ -102,6 +102,11 @@ BAD_EXCHANGES = {
         ], "Does not provide timeframes. ccxt fetchOHLCV: emulated"),
     }
 
+MAP_EXCHANGE_CHILDCLASS = {
+    'binanceus': 'binance',
+    'binanceje': 'binance',
+}
+
 
 def retrier_async(f):
     async def wrapper(*args, **kwargs):

freqtrade/resolvers/exchange_resolver.py

@@ -3,7 +3,7 @@ This module loads custom exchanges
 """
 import logging
 
-from freqtrade.exchange import Exchange
+from freqtrade.exchange import Exchange, MAP_EXCHANGE_CHILDCLASS
 import freqtrade.exchange as exchanges
 from freqtrade.resolvers import IResolver
 
@@ -22,6 +22,8 @@ class ExchangeResolver(IResolver):
         Load the custom class from config parameter
         :param config: configuration dictionary
         """
+        # Map exchange name to avoid duplicate classes for identical exchanges
+        exchange_name = MAP_EXCHANGE_CHILDCLASS.get(exchange_name, exchange_name)
         exchange_name = exchange_name.title()
         try:
             self.exchange = self._load_exchange(exchange_name, kwargs={'config': config})

tests/exchange/test_exchange.py

@@ -142,6 +142,12 @@ def test_exchange_resolver(default_conf, mocker, caplog):
     assert not log_has_re(r"No .* specific subclass found. Using the generic class instead.",
                           caplog)
 
+    # Test mapping
+    exchange = ExchangeResolver('binanceus', default_conf).exchange
+    assert isinstance(exchange, Exchange)
+    assert isinstance(exchange, Binance)
+    assert not isinstance(exchange, Kraken)
+
 
 def test_validate_order_time_in_force(default_conf, mocker, caplog):
     caplog.set_level(logging.INFO)