[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

qinling is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: Icfaa8e59840406b5fddbde55a1cac67035a22935

.zuul.yaml

@@ -53,6 +53,7 @@
         qinling: https://opendev.org/openstack/qinling
       devstack_localrc:
         TEMPEST_PLUGINS: /opt/stack/qinling
+        USE_PYTHON3: True
       tox_envlist: all-plugin
       tempest_test_regex: ^(qinling_tempest_plugin.)
       # Qinling's default replicas number is 3, some test cases need
@@ -69,19 +70,16 @@
     templates:
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - check-requirements
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - openstack-tox-pep8
         - qinling-tempest
     gate:
       queue: qinling
       jobs:
-        - openstack-tox-pep8
         - qinling-tempest
     experimental:
       jobs:

doc/requirements.txt

@@ -2,8 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 # this is required for the docs build jobs
-sphinx>=1.6.2,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.6.2;python_version>='3.4' # BSD
+sphinx>=1.6.2 # BSD
 sphinxcontrib-apidoc>=0.2.0 # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=1.8.0  # Apache-2.0

qinling/utils/etcd_util.py

@@ -14,6 +14,7 @@
 
 import etcd3gw
 from oslo_config import cfg
+from oslo_utils import encodeutils
 
 CONF = cfg.CONF
 CLIENT = None
@@ -74,7 +75,7 @@ def delete_worker(function_id, worker, version=0):
 def get_workers(function_id, version=0):
     client = get_client()
     values = client.get_prefix("%s_%s/worker" % (function_id, version))
-    workers = [w[0] for w in values]
+    workers = [encodeutils.safe_decode(w[0]) for w in values]
     return workers
 
 
@@ -91,4 +92,4 @@ def create_service_url(function_id, url, version=0):
 def get_service_url(function_id, version=0):
     client = get_client()
     values = client.get('%s_%s/service_url' % (function_id, version))
-    return None if not values else values[0]
+    return None if not values else encodeutils.safe_decode(values[0])

qinling_tempest_plugin/services/qinling_client.py

@@ -163,8 +163,9 @@ class QinlingClient(client_base.QinlingClientBase):
         return resp, body
 
     def get_execution_log(self, execution_id):
-        return self.get('/v1/executions/%s/log' % execution_id,
-                        headers={'Accept': 'text/plain'})
+        resp, body = self.get('/v1/executions/%s/log' % execution_id,
+                              headers={'Accept': 'text/plain'})
+        return resp, str(body)
 
     def get_function_workers(self, function_id, version=0):
         q_params = None

releasenotes/notes/drop-py-2-7-86062f8380134200.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of qinling
+    to support python 2.7 is OpenStack Train. The minimum version of Python now
+    supported by qinling is Python 3.6.

tox.ini

@@ -1,7 +1,8 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.1
 envlist = py37,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
 basepython = python3
@@ -22,7 +23,6 @@ whitelist_externals =
 commands = flake8 {posargs}
 
 [testenv:genconfig]
-basepython = python3
 commands =
     oslo-config-generator --config-file tools/config/config-generator.qinling.conf \
     --output-file etc/qinling.conf.sample