Optimize package import time

trains/backend_config/config.py

@@ -6,9 +6,8 @@ import os
 import sys
 import warnings
 from fnmatch import fnmatch
-from logging import Logger
 from os.path import expanduser
-from typing import Any, Text
+from typing import Any
 
 import pyhocon
 import six
@@ -40,6 +39,13 @@ from .log import initialize as initialize_log, logger
 from .reloader import ConfigReloader
 from .utils import get_options
 
+try:
+    from typing import Text
+except ImportError:
+    # windows conda-less hack
+    Text = Any
+
+
 log = logger(__file__)
 
 
@@ -150,6 +156,7 @@ class Config(object):
             env_config_paths = [expanduser(env_config_path_override)]
 
         # merge configuration from root and other environment config paths
+        if self.roots or env_config_paths:
             config = functools.reduce(
                 lambda cfg, path: ConfigTree.merge_configs(
                     cfg,
@@ -161,6 +168,7 @@ class Config(object):
             )
 
         # merge configuration from local configuration paths
+        if LOCAL_CONFIG_PATHS:
             config = functools.reduce(
                 lambda cfg, path: ConfigTree.merge_configs(
                     cfg, self._read_recursive(path, verbose=self._verbose), copy_trees=True
@@ -175,6 +183,7 @@ class Config(object):
             local_config_files = [expanduser(local_config_override)]
 
         # merge configuration from local configuration files
+        if local_config_files:
             config = functools.reduce(
                 lambda cfg, file_path: ConfigTree.merge_configs(
                     cfg,
@@ -256,10 +265,13 @@ class Config(object):
             default_config = self._read_recursive(
                 root_path / Environment.default, verbose=verbose
             )
+            if (root_path / env) != (root_path / Environment.default):
                 env_config = self._read_recursive(
                     root_path / env, verbose=verbose
                 )  # None is ok, will return empty config
                 config = ConfigTree.merge_configs(default_config, env_config, True)
+            else:
+                config = default_config
         else:
             config = ConfigTree()
 

trains/backend_config/defs.py

@@ -17,8 +17,8 @@ ENV_CONFIG_PATHS = [
 
 
 LOCAL_CONFIG_PATHS = [
-    '/etc/opt/trains',               # used by servers for docker-generated configuration
-    expanduser('~/.trains/config'),
+    # '/etc/opt/trains',               # used by servers for docker-generated configuration
+    # expanduser('~/.trains/config'),
 ]
 """ Local config paths, not related to environment """