add ha definitions

templates/kea-dhcp-ha.j2

+{% macro ha(ipversion = "ipv4" %}
+{%     set ha_servers = [] %}
+{%-    for fctnhst in function_hosts -%}
+{%-      set nodenetwork = hostvars[fctnhst].network %}
+{%-      if nodenetwork.devices is defined %}
+{%-        for ifname, ifdata in nodenetwork.devices.items() if ifdata.services is defined and ("dhcp-ha" in (ifdata.services | default([]))) %}
+{%-          set has = {"name": fctnhst}
+{%-          if ipversion == "ipv4" %}
+{%-            do has.update({"url": 'http://%s:%s/' | format(ifdata.ipv4 | default("127.0.0.1"), kea_ha_port)} %}
+{%-          else %}
+{%-            do has.update({"url": 'http://[%s]:%s/' | format(ifdata.ipv6 | default("::1"), kea_ha_port)} %}
+{%-          endif %}
+{%-          if fctnhst != dhcp_primary_server or fctnhst != dhcp_secondary_server %}
+{%-            do has.update({"auto-failover": false, "role": "backup"}) %}
+{%-          elif fctnhst == dhcp_primary_server %}
+{%-            do has.update({"auto-failover": true, "role": "primary"}) %}
+{%-          else %}
+{%-            if kea_ha_mode == "loadbalancing" %}
+{%-              do has.update({"auto-failover": true, "role": "secondary"}) %}
+{%-            else %}
+{%-              do has.update({"auto-failover": true, "role": "standby"}) %}
+{%-            endif %}
+{%-          endif %}
+{%-          do ha_servers.update(has) -%}
+{%-        endfor %}
+{%-      endif %}
+{%-    endfor %}   
+
+{%-    if (ha_servers | length) > 0 -%}
+    "hooks-libraries": [
+       {
+          "library": "/usr/lib/hooks/libdhcp_lease_cmds.so",
+          "parameters": { }
+       },
+       {
+          "library": "/usr/lib/hooks/libdhcp_ha.so",
+          "parameters": {
+              "high-availability": [ {
+                 "this-server-name": "{{ inventory_hostname}}",
+{%-    if kea_ha_mode = "loadbalancing" %}
+                 "mode": "load-balancing",
+{%-    else -%}
+                 "mode": "hot-standby",
+{%-    endif -%}
+                 "heartbeat-delay": 10000,
+                 "max-response-delay": 10000,
+                 "max-ack-delay": 5000,
+                 "max-unacked-clients": 5,
+                 "peers": [
+                    {{ ha_servers | to_nice_json(indent=8) }}
+                 ]
+              }
+          ]
+      }
+    ]
+{%-    endif -%}
+{%- endmacro %}