Allow comments in pairs files

freqtrade/configuration/configuration.py

@@ -11,10 +11,10 @@ from freqtrade import constants
 from freqtrade.configuration.check_exchange import check_exchange
 from freqtrade.configuration.deprecated_settings import process_temporary_deprecated_settings
 from freqtrade.configuration.directory_operations import create_datadir, create_userdata_dir
-from freqtrade.configuration.load_config import load_config_file
+from freqtrade.configuration.load_config import load_config_file, load_file
 from freqtrade.exceptions import OperationalException
 from freqtrade.loggers import setup_logging
-from freqtrade.misc import deep_merge_dicts, json_load
+from freqtrade.misc import deep_merge_dicts
 from freqtrade.state import NON_UTIL_MODES, TRADING_MODES, RunMode
 
 
@@ -454,8 +454,7 @@ class Configuration:
             # or if pairs file is specified explicitely
             if not pairs_file.exists():
                 raise OperationalException(f'No pairs file found with path "{pairs_file}".')
-            with pairs_file.open('r') as f:
-                config['pairs'] = json_load(f)
+            config['pairs'] = load_file(pairs_file)
             config['pairs'].sort()
             return
 
@@ -466,7 +465,6 @@ class Configuration:
             # Fall back to /dl_path/pairs.json
             pairs_file = config['datadir'] / 'pairs.json'
             if pairs_file.exists():
-                with pairs_file.open('r') as f:
-                    config['pairs'] = json_load(f)
+                config['pairs'] = load_file(pairs_file)
                 if 'pairs' in config:
                     config['pairs'].sort()

freqtrade/configuration/load_config.py

@@ -38,6 +38,15 @@ def log_config_error_range(path: str, errmsg: str) -> str:
     return ''
 
 
+def load_file(path: Path) -> Dict[str, Any]:
+    try:
+        with path.open('r') as file:
+            config = rapidjson.load(file, parse_mode=CONFIG_PARSE_MODE)
+    except FileNotFoundError:
+        raise OperationalException(f'File file "{path}" not found!')
+    return config
+
+
 def load_config_file(path: str) -> Dict[str, Any]:
     """
     Loads a config file from the given path

freqtrade/misc.py

@@ -81,7 +81,7 @@ def json_load(datafile: IO) -> Any:
     """
     load data with rapidjson
     Use this to have a consistent experience,
-    sete number_mode to "NM_NATIVE" for greatest speed
+    set number_mode to "NM_NATIVE" for greatest speed
     """
     return rapidjson.load(datafile, number_mode=rapidjson.NM_NATIVE)
 

tests/test_configuration.py

@@ -1038,37 +1038,30 @@ def test_pairlist_resolving_with_config(mocker, default_conf):
 
 def test_pairlist_resolving_with_config_pl(mocker, default_conf):
     patched_configuration_load_config_file(mocker, default_conf)
-    load_mock = mocker.patch("freqtrade.configuration.configuration.json_load",
-                             MagicMock(return_value=['XRP/BTC', 'ETH/BTC']))
-    mocker.patch.object(Path, "exists", MagicMock(return_value=True))
-    mocker.patch.object(Path, "open", MagicMock(return_value=MagicMock()))
 
     arglist = [
         'download-data',
         '--config', 'config.json',
-        '--pairs-file', 'pairs.json',
+        '--pairs-file', 'tests/testdata/pairs.json',
     ]
 
     args = Arguments(arglist).get_parsed_arg()
 
     configuration = Configuration(args)
     config = configuration.get_config()
-
-    assert load_mock.call_count == 1
-    assert config['pairs'] == ['ETH/BTC', 'XRP/BTC']
+    assert len(config['pairs']) == 23
+    assert 'ETH/BTC' in config['pairs']
+    assert 'XRP/BTC' in config['pairs']
     assert config['exchange']['name'] == default_conf['exchange']['name']
 
 
 def test_pairlist_resolving_with_config_pl_not_exists(mocker, default_conf):
     patched_configuration_load_config_file(mocker, default_conf)
-    mocker.patch("freqtrade.configuration.configuration.json_load",
-                 MagicMock(return_value=['XRP/BTC', 'ETH/BTC']))
-    mocker.patch.object(Path, "exists", MagicMock(return_value=False))
 
     arglist = [
         'download-data',
         '--config', 'config.json',
-        '--pairs-file', 'pairs.json',
+        '--pairs-file', 'tests/testdata/pairs_doesnotexist.json',
     ]
 
     args = Arguments(arglist).get_parsed_arg()
@@ -1081,7 +1074,7 @@ def test_pairlist_resolving_with_config_pl_not_exists(mocker, default_conf):
 def test_pairlist_resolving_fallback(mocker):
     mocker.patch.object(Path, "exists", MagicMock(return_value=True))
     mocker.patch.object(Path, "open", MagicMock(return_value=MagicMock()))
-    mocker.patch("freqtrade.configuration.configuration.json_load",
+    mocker.patch("freqtrade.configuration.configuration.load_file",
                  MagicMock(return_value=['XRP/BTC', 'ETH/BTC']))
     arglist = [
         'download-data',