Fail on Gerrit errors

Do not try to recover in case of Gerrit errors. It appears that
in certain circumstances retries cause Gerrit to ban the user.

Change-Id: I3ca3aa782eb8d2353a61ca504603e2935f8396d1

stackalytics/processor/default_data_processor.py

@@ -75,10 +75,9 @@ def _retrieve_project_list_from_gerrit(project_source):
 
         project_list = gerrit_inst.get_project_list()
         gerrit_inst.close()
-    except Exception as e:
-        LOG.exception(e)
-        LOG.warning('Fail to retrieve list of projects. Keep it unmodified')
-        return
+    except rcs.RcsException:
+        LOG.error('Failed to retrieve list of projects')
+        raise
 
     organization = project_source['organization']
     LOG.debug('Get list of projects for organization %s', organization)
@@ -108,9 +107,9 @@ def _retrieve_project_list_from_github(project_source):
     try:
         github_repos = github.get_organization(organization).get_repos()
     except Exception as e:
-        LOG.exception(e)
-        LOG.warning('Fail to retrieve list of projects. Keep it unmodified')
-        return
+        LOG.error('Failed to retrieve list of projects from GitHub: %s',
+                  e, exc_info=True)
+        raise
 
     for repo in github_repos:
         yield {

stackalytics/processor/rcs.py

@@ -28,6 +28,10 @@ PAGE_LIMIT = 100
 REQUEST_COUNT_LIMIT = 20
 
 
+class RcsException(Exception):
+    pass
+
+
 class Rcs(object):
     def __init__(self):
         pass
@@ -56,7 +60,7 @@ class Gerrit(Rcs):
             if not self.port:
                 self.port = DEFAULT_PORT
         else:
-            raise Exception('Invalid rcs uri %s' % uri)
+            raise RcsException('Invalid rcs uri %s' % uri)
 
         self.key_filename = None
         self.username = None
@@ -71,7 +75,7 @@ class Gerrit(Rcs):
         self.key_filename = kwargs.get('key_filename')
         self.username = kwargs.get('username')
 
-        return self._connect()
+        self._connect()
 
     def _connect(self):
         try:
@@ -79,13 +83,12 @@ class Gerrit(Rcs):
                                 key_filename=self.key_filename,
                                 username=self.username)
             LOG.debug('Successfully connected to Gerrit')
-            return True
         except Exception as e:
             LOG.error('Failed to connect to gerrit %(host)s:%(port)s. '
-                      'Error: %(err)s', {'host': self.hostname,
-                                         'port': self.port, 'err': e})
-            LOG.exception(e)
-            return False
+                      'Error: %(err)s',
+                      {'host': self.hostname, 'port': self.port, 'err': e},
+                      exc_info=True)
+            raise RcsException('Failed to connect to gerrit: %s' % e)
 
     def _get_cmd(self, project_organization, module, branch, age=0,
                  status=None, limit=PAGE_LIMIT, grab_comments=False):
@@ -113,10 +116,8 @@ class Gerrit(Rcs):
             return self.client.exec_command(cmd)
         except Exception as e:
             LOG.error('Error %(error)s while execute command %(cmd)s',
-                      {'error': e, 'cmd': cmd})
-            LOG.exception(e)
-            self.request_count = REQUEST_COUNT_LIMIT
-            return False
+                      {'error': e, 'cmd': cmd}, exc_info=True)
+            raise RcsException('Failed to execute command: %s', cmd)
 
     def _poll_reviews(self, project_organization, module, branch,
                       last_retrieval_time, status=None, grab_comments=False):
@@ -163,7 +164,7 @@ class Gerrit(Rcs):
     def get_project_list(self):
         exec_result = self._exec_command('gerrit ls-projects')
         if not exec_result:
-            raise Exception("Unable to retrieve list of projects from gerrit.")
+            raise RcsException("Gerrit returned no projects")
         stdin, stdout, stderr = exec_result
         result = [line.strip() for line in stdout]
 

stackalytics/tests/unit/test_rcs.py

@@ -41,9 +41,8 @@ class TestRcs(testtools.TestCase):
         mock_client.connect = mock_connect
 
         gerrit = rcs.Gerrit('gerrit://review.openstack.org')
-        setup_result = gerrit.setup(username='user', key_filename='key')
+        gerrit.setup(username='user', key_filename='key')
 
-        self.assertTrue(setup_result)
         mock_connect.assert_called_once_with(
             'review.openstack.org', port=rcs.DEFAULT_PORT, key_filename='key',
             username='user')
@@ -58,9 +57,9 @@ class TestRcs(testtools.TestCase):
         mock_connect.side_effect = Exception
 
         gerrit = rcs.Gerrit('gerrit://review.openstack.org')
-        setup_result = gerrit.setup(username='user', key_filename='key')
+        self.assertRaises(rcs.RcsException, gerrit.setup,
+                          username='user', key_filename='key')
 
-        self.assertFalse(setup_result)
         mock_connect.assert_called_once_with(
             'review.openstack.org', port=rcs.DEFAULT_PORT, key_filename='key',
             username='user')