Playbook for rabbitmq upgrade

Main issue with rabbitmq clusterer setup is to shut down gospel node
as last one, which is bulk of this change

Co-Authored-By: Sam Yaple <sam@yaple.net>
Change-Id: I88e566a19ed813b0e3eef65ef7139ccfaa0c2700
Implements: blueprint upgrade-rabbitmq
Partially-implements: blueprint upgrade-kolla

ansible/roles/rabbitmq/defaults/main.yml

@@ -14,3 +14,4 @@ rabbitmq_image_full: "{{ rabbitmq_image }}:{{ rabbitmq_tag }}"
 ####################
 rabbitmq_user: "openstack"
 rabbitmq_cluster_name: "openstack"
+rabbitmq_hostname: "{{ ansible_hostname }}"

ansible/roles/rabbitmq/tasks/upgrade.yml

 ---
+- include: config.yml
+
+- name: Find gospel node
+  command: docker exec -t rabbitmq /usr/local/bin/rabbitmq_get_gospel_node
+  changed_when: "{{ (gospel_node.stdout | from_json).changed }}"
+  failed_when: "{{ (gospel_node.stdout | from_json).failed }}"
+  register: gospel_node
+  run_once: True
+
+- name: Stopping non-gospel nodes
+  kolla_docker:
+    action: "stop_container"
+    common_options: "{{ docker_common_options }}"
+    name: "rabbitmq"
+  when: rabbitmq_hostname != (gospel_node.stdout | from_json).hostname
+
+- include: start.yml
+  when: rabbitmq_hostname == (gospel_node.stdout | from_json).hostname
+
+- include: start.yml
+  when: rabbitmq_hostname != (gospel_node.stdout | from_json).hostname

docker/rabbitmq/Dockerfile.j2

@@ -28,7 +28,8 @@ RUN rm -rf /var/lib/rabbitmq/* \
 
 COPY extend_start.sh /usr/local/bin/kolla_extend_start
 COPY rabbitmq_sudoers /etc/sudoers.d/rabbitmq_sudoers
-RUN chmod 755 /usr/local/bin/kolla_extend_start \
+COPY rabbitmq_get_gospel_node.py /usr/local/bin/rabbitmq_get_gospel_node
+RUN chmod 755 /usr/local/bin/kolla_extend_start /usr/local/bin/rabbitmq_get_gospel_node \
     && chmod 750 /etc/sudoers.d \
     && chmod 440 /etc/sudoers.d/rabbitmq_sudoers \
     && usermod -a -G kolla rabbitmq

docker/rabbitmq/rabbitmq_get_gospel_node.py

+#!/usr/bin/python
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+import re
+import subprocess
+import traceback
+
+
+def convert_erlang_to_json(term):
+    term = re.sub('[\s+]', '', term)
+    term = re.sub('([<>].*?)}', r'"\1"}', term)
+    term = re.sub('{([a-z].*?),', r'{"\1":', term)
+    term = re.sub(':([a-z].*?)}', r':"\1"}', term)
+    return json.loads(term)
+
+
+def main():
+    try:
+        raw_status = subprocess.check_output(
+            "rabbitmqctl eval 'rabbit_clusterer:status().'",
+            shell=True, stderr=subprocess.STDOUT
+        )
+        if "Rabbit is running in cluster configuration" not in raw_status:
+            raise AttributeError
+        status = convert_erlang_to_json(
+            '\n'.join(raw_status.split('\n')[1:-3])
+        )
+
+        gospel_node = None
+        for msg in status:
+            if 'gospel' in msg:
+                gospel_node = msg['gospel']['node'].split('@')[1]
+        if gospel_node is None:
+            raise AttributeError
+    except AttributeError:
+        result = {
+            'failed': True,
+            'error': raw_status,
+            'changed': True
+        }
+    except Exception:
+        result = {
+            'failed': True,
+            'error': traceback.format_exc(),
+            'changed': True
+        }
+    else:
+        result = {
+            'failed': False,
+            'hostname': gospel_node,
+            'changed': False
+        }
+
+    print(json.dumps(result))
+
+
+if __name__ == '__main__':
+    main()