Allow loading of any additional configuration to ccxt

seperated by async and non-async

freqtrade/exchange/__init__.py

@@ -93,8 +93,9 @@ class Exchange(object):
             logger.info('Instance is running with dry_run enabled')
 
         exchange_config = config['exchange']
-        self._api = self._init_ccxt(exchange_config)
-        self._api_async = self._init_ccxt(exchange_config, ccxt_async)
+        self._api = self._init_ccxt(exchange_config, ccxt_kwargs=exchange_config.get('ccxt_config'))
+        self._api_async = self._init_ccxt(exchange_config, ccxt_async,
+                                          ccxt_kwargs=exchange_config.get('ccxt_async_config'))
 
         logger.info('Using Exchange "%s"', self.name)
 
@@ -114,7 +115,8 @@ class Exchange(object):
         if self._api_async and inspect.iscoroutinefunction(self._api_async.close):
             asyncio.get_event_loop().run_until_complete(self._api_async.close())
 
-    def _init_ccxt(self, exchange_config: dict, ccxt_module=ccxt) -> ccxt.Exchange:
+    def _init_ccxt(self, exchange_config: dict, ccxt_module=ccxt,
+                   ccxt_kwargs: dict = None) -> ccxt.Exchange:
         """
         Initialize ccxt with given config and return valid
         ccxt instance.
@@ -124,14 +126,20 @@ class Exchange(object):
 
         if name not in ccxt_module.exchanges:
             raise OperationalException(f'Exchange {name} is not supported')
-        try:
-            api = getattr(ccxt_module, name.lower())({
+
+        ex_config = {
                 'apiKey': exchange_config.get('key'),
                 'secret': exchange_config.get('secret'),
                 'password': exchange_config.get('password'),
                 'uid': exchange_config.get('uid', ''),
                 'enableRateLimit': exchange_config.get('ccxt_rate_limit', True)
-            })
+            }
+        if ccxt_kwargs:
+            logger.info('Applying additional ccxt config: %s', ccxt_kwargs)
+            ex_config.update(ccxt_kwargs)
+        try:
+
+            api = getattr(ccxt_module, name.lower())(ex_config)
         except (KeyError, AttributeError):
             raise OperationalException(f'Exchange {name} is not supported')
 

freqtrade/tests/exchange/test_exchange.py

@@ -1,5 +1,6 @@
 # pragma pylint: disable=missing-docstring, C0103, bad-continuation, global-statement
 # pragma pylint: disable=protected-access
+import copy
 import logging
 from datetime import datetime
 from random import randint
@@ -56,6 +57,32 @@ def test_init(default_conf, mocker, caplog):
     assert log_has('Instance is running with dry_run enabled', caplog.record_tuples)
 
 
+def test_init_ccxt_kwargs(default_conf, mocker, caplog):
+    mocker.patch('freqtrade.exchange.Exchange._load_markets', MagicMock(return_value={}))
+    caplog.set_level(logging.INFO)
+    conf = copy.deepcopy(default_conf)
+    conf['exchange']['ccxt_async_config'] = {'aiohttp_trust_env': True}
+    ex = Exchange(conf)
+    assert log_has("Applying additional ccxt config: {'aiohttp_trust_env': True}",
+                   caplog.record_tuples)
+    assert ex._api_async.aiohttp_trust_env
+    assert not ex._api.aiohttp_trust_env
+
+    # Reset logging and config
+    caplog.clear()
+    conf = copy.deepcopy(default_conf)
+    conf['exchange']['ccxt_config'] = {'TestKWARG': 11}
+    ex = Exchange(conf)
+    assert not log_has("Applying additional ccxt config: {'aiohttp_trust_env': True}",
+                       caplog.record_tuples)
+    assert not ex._api_async.aiohttp_trust_env
+    assert hasattr(ex._api, 'TestKWARG')
+    assert ex._api.TestKWARG == 11
+    assert not hasattr(ex._api_async, 'TestKWARG')
+    assert log_has("Applying additional ccxt config: {'TestKWARG': 11}",
+                   caplog.record_tuples)
+
+
 def test_destroy(default_conf, mocker, caplog):
     caplog.set_level(logging.DEBUG)
     get_patched_exchange(mocker, default_conf)