Use importlib to load testcases

It modifies run_tests.py to dynamically execute testcases and then
removes the test condition about odl.
It also induces that the modules and the related classes must be
defined in ci/testcases.yaml.

JIRA: FUNCTEST-353

Change-Id: I6ad67b70624aac6bf805c9bde4dfef7c9fbd5c00
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

3 files changed, 45 insertions, 9 deletions

diff --git a/ci/run_tests.py b/ci/run_tests.py
index 834a29bfe..f30062f75 100755
--- a/ci/run_tests.py
+++ b/ci/run_tests.py
@@ -9,6 +9,7 @@
 #
 
 import datetime
+import importlib
 import os
 import re
 import sys
@@ -23,7 +24,6 @@ import functest.utils.functest_utils as ft_utils
 import functest.utils.openstack_clean as os_clean
 import functest.utils.openstack_snapshot as os_snapshot
 import functest.utils.openstack_utils as os_utils
-import functest.testcases.Controllers.ODL.OpenDaylightTesting as odl_test
 
 
 parser = argparse.ArgumentParser()
@@ -84,6 +84,19 @@ def update_test_info(test_name, result, duration):
                          "duration": duration})
 
 
+def get_run_dict_if_defined(testname):
+    try:
+        dict = ft_utils.get_dict_by_test(testname)
+        if not dict:
+            logger.error("Cannot get {}'s config options".format(testname))
+        elif 'run' in dict:
+            return dict['run']
+        return None
+    except Exception:
+        logger.exception("Cannot get {}'s config options".format(testname))
+        return None
+
+
 def run_test(test, tier_name):
     global OVERALL_RESULT, EXECUTED_TEST_CASES
     result_str = "PASS"
@@ -102,14 +115,27 @@ def run_test(test, tier_name):
     if REPORT_FLAG:
         flags += " -r"
 
-    if test_name == 'odl':
-        odl = odl_test.ODLTestCases()
-        result = odl.run()
-        if result == TestCasesBase.TestCasesBase.EX_OK and REPORT_FLAG:
-            result = odl.push_to_db()
+    result = TestCasesBase.TestCasesBase.EX_RUN_ERROR
+    run_dict = get_run_dict_if_defined(test_name)
+    if run_dict:
+        try:
+            module = importlib.import_module(run_dict['module'])
+            cls = getattr(module, run_dict['class'])
+            test_case = cls()
+            result = test_case.run()
+            if result == TestCasesBase.TestCasesBase.EX_OK and REPORT_FLAG:
+                result = test_case.push_to_db()
+        except ImportError:
+            logger.exception("Cannot import module {}".format(
+                run_dict['module']))
+        except AttributeError:
+            logger.exception("Cannot get class {}".format(
+                run_dict['class']))
     else:
         cmd = ("%s%s" % (EXEC_SCRIPT, flags))
-        logger.debug("Executing command '%s'" % cmd)
+        logger.info("Executing command {} because {} "
+                    "doesn't implement the new framework".format(
+                        cmd, test_name))
         result = ft_utils.execute_command(cmd)
 
     if CLEAN_FLAG:
diff --git a/ci/testcases.yaml b/ci/testcases.yaml
index 02b69ec8b..22509e611 100644
--- a/ci/testcases.yaml
+++ b/ci/testcases.yaml
@@ -92,6 +92,9 @@ tiers:
                 dependencies:
                     installer: ''
                     scenario: 'odl'
+                run:
+                    module: 'functest.testcases.Controllers.ODL.OpenDaylightTesting'
+                    class: 'ODLTestCases'
 
             -
                 name: onos
diff --git a/utils/functest_utils.py b/utils/functest_utils.py
index ef865bedf..41b6485d9 100644
--- a/utils/functest_utils.py
+++ b/utils/functest_utils.py
@@ -341,19 +341,26 @@ def get_deployment_dir():
     return deployment_dir
 
 
-def get_criteria_by_test(testname):
+def get_dict_by_test(testname):
     with open(get_testcases_file()) as f:
         testcases_yaml = yaml.safe_load(f)
 
     for dic_tier in testcases_yaml.get("tiers"):
         for dic_testcase in dic_tier['testcases']:
             if dic_testcase['name'] == testname:
-                return dic_testcase['criteria']
+                return dic_testcase
 
     logger.error('Project %s is not defined in testcases.yaml' % testname)
     return None
 
 
+def get_criteria_by_test(testname):
+    dict = get_dict_by_test(testname)
+    if dict:
+        return dict['criteria']
+    return None
+
+
 # ----------------------------------------------------------
 #
 #               YAML UTILS