exchange: extract ccxt init to its own function (so that we can init ccxt from the scripts)

freqtrade/arguments.py

@@ -240,7 +240,7 @@ class Arguments(object):
 
     def scripts_options(self) -> None:
         """
-        Parses given arguments for plot scripts.
+        Parses given arguments for scripts.
         """
         self.parser.add_argument(
             '-p', '--pair',
@@ -248,3 +248,20 @@ class Arguments(object):
             dest='pair',
             default=None
         )
+
+    def testdata_dl_options(self) -> None:
+        """
+        Parses given arguments for testdata download
+        """
+        self.parser.add_argument(
+            '--pairs-file',
+            help='File containing a list of pairs to download',
+            dest='pairs_file',
+            default=None
+        )
+
+        self.parser.add_argument(
+            '--export',
+            help='Export files to given dir',
+            dest='export',
+            default=None)

freqtrade/exchange/__init__.py

@@ -45,6 +45,32 @@ def retrier(f):
     return wrapper
 
 
+def init_ccxt(exchange_config: dict) -> ccxt:
+    """
+    Initialize ccxt with given config and return valid
+    ccxt instance.
+    :param config: config to use
+    :return: ccxt
+    """
+    # Find matching class for the given exchange name
+    name = exchange_config['name']
+
+    if name not in ccxt.exchanges:
+        raise OperationalException('Exchange {} is not supported'.format(name))
+    try:
+        api = getattr(ccxt, name.lower())({
+            'apiKey': exchange_config.get('key'),
+            'secret': exchange_config.get('secret'),
+            'password': exchange_config.get('password'),
+            'uid': exchange_config.get('uid' ''),
+            'enableRateLimit': True,
+        })
+    except (KeyError, AttributeError):
+        raise OperationalException('Exchange {} is not supported'.format(name))
+
+    return api
+
+
 def init(config: dict) -> None:
     """
     Initializes this module with the given config,
@@ -61,22 +87,7 @@ def init(config: dict) -> None:
         logger.info('Instance is running with dry_run enabled')
 
     exchange_config = config['exchange']
-
-    # Find matching class for the given exchange name
-    name = exchange_config['name']
-
-    if name not in ccxt.exchanges:
-        raise OperationalException('Exchange {} is not supported'.format(name))
-    try:
-        _API = getattr(ccxt, name.lower())({
-            'apiKey': exchange_config.get('key'),
-            'secret': exchange_config.get('secret'),
-            'password': exchange_config.get('password'),
-            'uid': exchange_config.get('uid'),
-            'enableRateLimit': True,
-        })
-    except (KeyError, AttributeError):
-        raise OperationalException('Exchange {} is not supported'.format(name))
+    _API = init_ccxt(exchange_config)
 
     logger.info('Using Exchange "%s"', get_name())
 

freqtrade/misc.py

@@ -71,6 +71,8 @@ def file_dump_json(filename, data, is_zip=False) -> None:
     :param data: JSON Data to save
     :return:
     """
+    print(f'dumping json to "{filename}"')
+
     if is_zip:
         if not filename.endswith('.gz'):
             filename = filename + '.gz'