Add coordination support

This patch adds configuration for coordination service when cinder
active/active setup is used and coordination hosts exist

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/864750
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/865805
Change-Id: I2dda4c74aa69aea3ecea92954922dbfe1bd56687

defaults/main.yml

@@ -110,6 +110,16 @@ cinder_oslomsg_notify_ssl_ca_file: "{{ oslomsg_notify_ssl_ca_file | default('')
 # TODO(evrardjp): Change structure when more backends will be supported
 cinder_oslomsg_amqp1_enabled: "{{ cinder_oslomsg_rpc_transport == 'amqp' }}"
 
+## Coordintation
+cinder_coordination_driver: "{{ coordination_driver | default('zookeeper') }}"
+cinder_coordination_group: "{{ coordination_host_group | default('zookeeper_all') }}"
+cinder_coordination_enable: "{{ cinder_active_active_cluster and (cinder_coordination_group in groups and groups[cinder_coordination_group] | length > 0) }}"
+cinder_coordination_namespace: cinder
+cinder_coordination_client_ssl: "{{ coordination_client_ssl | default(False) }}"
+cinder_coordination_verify_cert: "{{ coordination_verify_cert | default(True) }}"
+cinder_coordination_port: "{{ coordination_port | default(cinder_coordination_client_ssl | ternary('2281', '2181')) }}"
+cinder_coordination_url: "{{ _cinder_coordination_url | default() }}"
+
 ## Cinder User / Group
 cinder_system_user_name: cinder
 cinder_system_group_name: cinder
@@ -312,6 +322,7 @@ cinder_pip_packages:
   - pymemcache
   - python-memcached
   - systemd-python
+  - "tooz[{{ cinder_coordination_driver }}]"
 
 # Specific pip packages provided by the user
 cinder_user_pip_packages: []

templates/cinder.conf.j2

@@ -111,6 +111,11 @@ allowed_direct_url_schemes = cinder
 {% endfor %}
 {% endif %}
 
+{% if cinder_coordination_enable %}
+[coordination]
+backend_url = {{ cinder_coordination_url }}
+{% endif %}
+
 [backend_defaults]
 target_helper = {{ cinder_target_helper }}
 

vars/main.yml

@@ -122,3 +122,10 @@ cinder_service_catalog:
     state: present
 
 _cinder_oslomsg_heartbeat_in_pthread: "{{ (cinder_services['cinder-volume']['group'] in group_names) | ternary(False, True) }}"
+
+_cinder_coordination_url: >-
+  {{ cinder_coordination_driver }}://{{
+      groups[cinder_coordination_group]
+        | map('extract', hostvars, 'ansible_host')
+        | list | join(':' ~ cinder_coordination_port ~ ',')
+    }}:{{ cinder_coordination_port }}?namespace={{ cinder_coordination_namespace }}{% if cinder_coordination_client_ssl | bool %}&use_ssl=True&verify_certs={{ cinder_coordination_verify_cert | bool }}{% endif %}