Get properly env vars or their default values

It defines env.get() as an unique way to get Functest env vars or
their default values. It can be considered as a wrapper above os.environ.

It enforces backward compatibility via CONST which mustn't be used
for that purpose. It should be noted that it also stops using CONST
for getting OpenStack env vars.

Change-Id: I333dc1afbc0123166a7eaff8b551370098efa341
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

6 files changed, 26 insertions, 21 deletions

diff --git a/functest/opnfv_tests/openstack/rally/rally.py b/functest/opnfv_tests/openstack/rally/rally.py
index 2632fd39..add0f243 100644
--- a/functest/opnfv_tests/openstack/rally/rally.py
+++ b/functest/opnfv_tests/openstack/rally/rally.py
@@ -29,6 +29,7 @@ from functest.energy import energy
 from functest.opnfv_tests.openstack.snaps import snaps_utils
 from functest.opnfv_tests.openstack.tempest import conf_utils
 from functest.utils.constants import CONST
+from functest.utils import env
 
 from snaps.config.flavor import FlavorConfig
 from snaps.config.image import ImageConfig
@@ -218,8 +219,8 @@ class RallyBase(testcase.TestCase):
             with open(RallyBase.BLACKLIST_FILE, 'r') as black_list_file:
                 black_list_yaml = yaml.safe_load(black_list_file)
 
-            installer_type = os.getenv('INSTALLER_TYPE', None)
-            deploy_scenario = os.getenv('DEPLOY_SCENARIO', None)
+            installer_type = env.get('INSTALLER_TYPE')
+            deploy_scenario = env.get('DEPLOY_SCENARIO')
             if (bool(installer_type) and bool(deploy_scenario) and
                     'scenario' in black_list_yaml.keys()):
                 for item in black_list_yaml['scenario']:
diff --git a/functest/opnfv_tests/openstack/snaps/snaps_test_runner.py b/functest/opnfv_tests/openstack/snaps/snaps_test_runner.py
index 9d31f426..216d9acf 100644
--- a/functest/opnfv_tests/openstack/snaps/snaps_test_runner.py
+++ b/functest/opnfv_tests/openstack/snaps/snaps_test_runner.py
@@ -15,6 +15,7 @@ import logging
 from functest.core import unit
 from functest.opnfv_tests.openstack.snaps import snaps_utils
 from functest.utils.constants import CONST
+from functest.utils import env
 
 from snaps.openstack import create_flavor
 
@@ -44,7 +45,7 @@ class SnapsTestRunner(unit.Suite):
             CONST.__getattribute__('snaps_use_floating_ips') == 'True')
         self.use_keystone = (
             CONST.__getattribute__('snaps_use_keystone') == 'True')
-        scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+        scenario = env.get('DEPLOY_SCENARIO')
 
         self.flavor_metadata = None
         if 'ovs' in scenario or 'fdio' in scenario:
diff --git a/functest/opnfv_tests/openstack/snaps/snaps_utils.py b/functest/opnfv_tests/openstack/snaps/snaps_utils.py
index 6bc50ad6..59bd063c 100644
--- a/functest/opnfv_tests/openstack/snaps/snaps_utils.py
+++ b/functest/opnfv_tests/openstack/snaps/snaps_utils.py
@@ -10,6 +10,7 @@
 """Some common utils wrapping snaps functions """
 
 from functest.utils.constants import CONST
+from functest.utils import env
 
 from snaps.openstack.tests import openstack_tests
 from snaps.openstack.utils import neutron_utils, nova_utils
@@ -24,8 +25,8 @@ def get_ext_net_name(os_creds):
     """
     neutron = neutron_utils.neutron_client(os_creds)
     ext_nets = neutron_utils.get_external_networks(neutron)
-    if hasattr(CONST, 'EXTERNAL_NETWORK'):
-        extnet_config = CONST.__getattribute__('EXTERNAL_NETWORK')
+    if env.get('EXTERNAL_NETWORK'):
+        extnet_config = env.get('EXTERNAL_NETWORK')
         for ext_net in ext_nets:
             if ext_net.name == extnet_config:
                 return extnet_config
diff --git a/functest/opnfv_tests/openstack/tempest/conf_utils.py b/functest/opnfv_tests/openstack/tempest/conf_utils.py
index f128784c..09471fa5 100644
--- a/functest/opnfv_tests/openstack/tempest/conf_utils.py
+++ b/functest/opnfv_tests/openstack/tempest/conf_utils.py
@@ -14,13 +14,14 @@ import ConfigParser
 import logging
 import fileinput
 import os
-import pkg_resources
 import shutil
 import subprocess
 
+import pkg_resources
 import yaml
 
 from functest.utils.constants import CONST
+from functest.utils import env
 import functest.utils.functest_utils as ft_utils
 
 
@@ -51,7 +52,7 @@ TEST_ACCOUNTS_FILE = pkg_resources.resource_filename(
     'functest',
     'opnfv_tests/openstack/tempest/custom_tests/test_accounts.yaml')
 
-CI_INSTALLER_TYPE = CONST.__getattribute__('INSTALLER_TYPE')
+CI_INSTALLER_TYPE = env.get('INSTALLER_TYPE')
 
 """ logging configuration """
 LOGGER = logging.getLogger(__name__)
@@ -60,7 +61,7 @@ LOGGER = logging.getLogger(__name__)
 def create_rally_deployment():
     """Create new rally deployment"""
     # set the architecture to default
-    pod_arch = os.getenv("POD_ARCH", None)
+    pod_arch = env.get("POD_ARCH")
     arch_filter = ['aarch64']
 
     if pod_arch and pod_arch in arch_filter:
@@ -294,10 +295,9 @@ def configure_tempest_update_params(tempest_conf_file, network_name=None,
         config.set('compute', 'min_compute_nodes', compute_cnt)
         config.set('compute-feature-enabled', 'live_migration', True)
 
-    config.set('identity', 'region',
-               CONST.__getattribute__('OS_REGION_NAME'))
-    identity_api_version = os.getenv(
-        "OS_IDENTITY_API_VERSION", os.getenv("IDENTITY_API_VERSION"))
+    config.set('identity', 'region', os.environ.get('OS_REGION_NAME'))
+    identity_api_version = os.environ.get(
+        "OS_IDENTITY_API_VERSION", os.environ.get("IDENTITY_API_VERSION"))
     if identity_api_version == '3':
         auth_version = 'v3'
         config.set('identity-feature-enabled', 'api_v2', False)
@@ -310,11 +310,11 @@ def configure_tempest_update_params(tempest_conf_file, network_name=None,
     config.set('object-storage', 'operator_role',
                CONST.__getattribute__('tempest_object_storage_operator_role'))
 
-    if CONST.__getattribute__('OS_ENDPOINT_TYPE') is not None:
+    if os.environ.get('OS_ENDPOINT_TYPE') is not None:
         config.set('identity', 'v3_endpoint_type',
-                   CONST.__getattribute__('OS_ENDPOINT_TYPE'))
+                   os.environ.get('OS_ENDPOINT_TYPE'))
 
-    if CONST.__getattribute__('OS_ENDPOINT_TYPE') is not None:
+    if os.environ.get('OS_ENDPOINT_TYPE') is not None:
         sections = config.sections()
         services_list = ['compute',
                          'volume',
@@ -327,7 +327,7 @@ def configure_tempest_update_params(tempest_conf_file, network_name=None,
             if service not in sections:
                 config.add_section(service)
             config.set(service, 'endpoint_type',
-                       CONST.__getattribute__('OS_ENDPOINT_TYPE'))
+                       os.environ.get('OS_ENDPOINT_TYPE'))
 
     LOGGER.debug('Add/Update required params defined in tempest_conf.yaml '
                  'into tempest.conf file')
diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index 56705fc0..c19c8d9d 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -26,6 +26,7 @@ from functest.core import testcase
 from functest.opnfv_tests.openstack.snaps import snaps_utils
 from functest.opnfv_tests.openstack.tempest import conf_utils
 from functest.utils.constants import CONST
+from functest.utils import env
 import functest.utils.functest_utils as ft_utils
 
 from snaps.config.flavor import FlavorConfig
@@ -128,8 +129,8 @@ class TempestCommon(testcase.TestCase):
         result_file = open(conf_utils.TEMPEST_LIST, 'w')
         black_tests = []
         try:
-            installer_type = CONST.__getattribute__('INSTALLER_TYPE')
-            deploy_scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+            installer_type = env.get('INSTALLER_TYPE')
+            deploy_scenario = env.get('DEPLOY_SCENARIO')
             if bool(installer_type) * bool(deploy_scenario):
                 # if INSTALLER_TYPE and DEPLOY_SCENARIO are set we read the
                 # file
@@ -405,7 +406,7 @@ class TempestResourcesManager(object):
 
     def _create_flavor(self, name):
         """Create flavor for tests."""
-        scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+        scenario = env.get('DEPLOY_SCENARIO')
         flavor_metadata = None
         if 'ovs' in scenario or 'fdio' in scenario:
             flavor_metadata = create_flavor.MEM_PAGE_SIZE_LARGE
@@ -463,7 +464,7 @@ class TempestResourcesManager(object):
 
         if use_custom_flavors:
             LOGGER.info("Creating 2nd flavor for Tempest suite")
-            scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+            scenario = env.get('DEPLOY_SCENARIO')
             if 'ovs' in scenario or 'fdio' in scenario:
                 CONST.__setattr__('openstack_flavor_ram', 1024)
             name = CONST.__getattribute__(
diff --git a/functest/opnfv_tests/openstack/vping/vping_base.py b/functest/opnfv_tests/openstack/vping/vping_base.py
index 7170101f..fae5db2d 100644
--- a/functest/opnfv_tests/openstack/vping/vping_base.py
+++ b/functest/opnfv_tests/openstack/vping/vping_base.py
@@ -18,6 +18,7 @@ import uuid
 from functest.core import testcase
 from functest.opnfv_tests.openstack.snaps import snaps_utils
 from functest.utils.constants import CONST
+from functest.utils import env
 
 from snaps.config.flavor import FlavorConfig
 from snaps.config.network import NetworkConfig, SubnetConfig
@@ -135,7 +136,7 @@ class VPingBase(testcase.TestCase):
 
         self.logger.info(
             "Creating flavor with name: '%s'", self.flavor_name)
-        scenario = getattr(CONST, 'DEPLOY_SCENARIO')
+        scenario = env.get('DEPLOY_SCENARIO')
         flavor_metadata = None
         flavor_ram = 512
         if 'ovs' in scenario or 'fdio' in scenario: