added ability to concatenate several environment variables into one line (#73)

* added ability to concatenate several environment variables into one line

Author: shulutkov

.dockerignore

@@ -6,5 +6,10 @@ Dockerfile*
 .gitignore
 .idea/
 .tox/
+.travis.yml
+tox.ini
 __pychache__
 htmlcov/
+tests/
+*.png
+

k8s_handle/config.py

@@ -13,7 +13,7 @@
 log = logging.getLogger(__name__)
 
 INCLUDE_RE = re.compile(r'{{\s?file\s?=\s?\'(?P<file>[^\']*)\'\s?}}')
-CUSTOM_ENV_RE = re.compile(r'^(?P<prefix>.*){{\s*env\s*=\s*\'(?P<env>[^\']*)\'\s*}}(?P<postfix>.*)$')  # noqa
+CUSTOM_ENV_RE = r'{{\s*env\s*=\s*\'([^\']*)\'\s*}}'
 
 KEY_USE_KUBECONFIG = 'use_kubeconfig'
 KEY_K8S_MASTER_URI = 'k8s_master_uri'
@@ -113,19 +113,15 @@ def _process_variable(variable):
     if matches:
         return load_yaml(matches.groupdict().get('file'))
 
-    matches = CUSTOM_ENV_RE.match(variable)
+    try:
+        return re.sub(CUSTOM_ENV_RE, lambda m: os.environ[m.group(1)], variable)
 
-    if matches:
-        prefix = matches.groupdict().get('prefix')
-        env_var_name = matches.groupdict().get('env')
-        postfix = matches.groupdict().get('postfix')
-
-        if os.environ.get(env_var_name) is None and settings.GET_ENVIRON_STRICT:
-            raise RuntimeError('Environment variable "{}" is not set'.format(env_var_name))
-
-        return prefix + os.environ.get(env_var_name, '') + postfix
+    except KeyError as err:
+        log.debug('Environment variable "{}" is not set'.format(err.args[0]))
+        if settings.GET_ENVIRON_STRICT:
+            raise RuntimeError('Environment variable "{}" is not set'.format(err.args[0]))
 
-    return variable
+    return re.sub(CUSTOM_ENV_RE, lambda m: os.environ.get(m.group(1), ''), variable)
 
 
 def _update_single_variable(value, include_history):

tests/test_config.py

@@ -118,13 +118,17 @@ def test_context_update_recursion(self):
                     'section1-key4': [0, 1, 2, 3],
                     'section1-key5': "{{ env='CUSTOM_ENV' }}",
                     'section1-key6': "{{ file='tests/fixtures/include.yaml' }}",
+                    'section1-key7': "{{ env='CUSTOM_ENV'}} = {{ env='CUSTOM_ENV' }}",
+                    'section1-key8': "{{ env='NULL_VAR' }}-{{ env='CUSTOM_ENV' }}"
                 }
             },
             'section2': [
                 {},
                 'var2',
                 'var3',
-                '{{ env=\'CUSTOM_ENV\' }}'
+                '{{ env=\'CUSTOM_ENV\' }}',
+                '{{ env=\'CUSTOM_ENV\' }} = {{ env=\'CUSTOM_ENV\' }}',
+                '{{ env=\'NULL_VAR\' }}-{{ env=\'CUSTOM_ENV\' }}'
             ],
             'section3': [0, 1, 2, 3, 4]
         }
@@ -137,13 +141,17 @@ def test_context_update_recursion(self):
                     'section1-key4': [0, 1, 2, 3],
                     'section1-key5': 'My value',
                     'section1-key6': {'ha_ha': 'included_var'},
+                    'section1-key7': 'My value = My value',
+                    'section1-key8': "-My value"
                 }
             },
             'section2': [
                 {},
                 'var2',
                 'var3',
-                'My value'
+                'My value',
+                'My value = My value',
+                '-My value'
             ],
             'section3': [0, 1, 2, 3, 4]
         }