Add coordination support

This patch adds configuration for coordination service when it's
available.

Depends-On: https://review.opendev.org/c/openstack/ansible-role-zookeeper/+/865449
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/864750
Change-Id: I632439956f17bbac8987c3429634ebac8b1c3d44

defaults/main.yml

@@ -59,6 +59,16 @@ designate_system_shell: /bin/false
 designate_system_comment: designate system user
 designate_system_user_home: "/var/lib/{{ designate_system_user_name }}"
 
+## Coordination info
+designate_coordination_driver: "{{ coordination_driver | default('zookeeper') }}"
+designate_coordination_group: "{{ coordination_host_group | default('zookeeper_all') }}"
+designate_coordination_enable: "{{ designate_coordination_group in groups and groups[designate_coordination_group] | length > 0 }}"
+designate_coordination_namespace: designate
+designate_coordination_client_ssl: "{{ coordination_client_ssl | default(False) }}"
+designate_coordination_verify_cert: "{{ coordination_verify_cert | default(True) }}"
+designate_coordination_port: "{{ coordination_port | default(designate_coordination_client_ssl | ternary('2281', '2181')) }}"
+designate_coordination_url: "{{ _designate_coordination_url | default() }}"
+
 ## Database info
 designate_db_setup_host: "{{ openstack_db_setup_host | default('localhost') }}"
 designate_db_setup_python_interpreter: "{{ openstack_db_setup_python_interpreter | default((designate_db_setup_host == 'localhost') | ternary(ansible_playbook_python, ansible_facts['python']['executable'])) }}"
@@ -192,6 +202,7 @@ designate_pip_packages:
   - pymemcache
   - python-memcached
   - systemd-python
+  - "tooz[{{ designate_coordination_driver }}]"
   - warlock
 designate_user_pip_packages: []
 

templates/designate.conf.j2

@@ -452,12 +452,13 @@ connection_recycle_time = {{ designate_db_connection_recycle_time }}
 [oslo_middleware]
 enable_proxy_headers_parsing = true
 
+{% if designate_coordination_enable %}
 ########################
 ## Coordination
 ########################
 [coordination]
-# URL for the coordination backend to use.
-#backend_url = kazoo://127.0.0.1/
+backend_url = {{ designate_coordination_url }}
+{% endif %}
 
 ########################
 ## Hook Points

vars/main.yml

@@ -39,3 +39,10 @@ filtered_designate_services: |-
   {%   endif %}
   {% endfor %}
   {{ services | sort(attribute='start_order') }}
+
+_designate_coordination_url: >-
+  {{ designate_coordination_driver }}://{{
+      groups[designate_coordination_group]
+        | map('extract', hostvars, 'ansible_host')
+        | list | join(':' ~ designate_coordination_port ~ ',')
+    }}:{{ designate_coordination_port }}?namespace={{ designate_coordination_namespace }}{% if designate_coordination_client_ssl | bool %}&use_ssl=True&verify_certs={{ designate_coordination_verify_cert | bool }}{% endif %}