Adding support for zabbix host macros per ansible inventory

Signed-off-by: Fabian Arrotin <arrfab@centos.org>

defaults/main.yml

@@ -7,3 +7,11 @@ zabbix_agent_tls: False
 zabbix_agent_tls_psk:           # gen with `openssl rand -hex 32` and also known by zabbix server
 zabbix_agent_tls_psk_identity:  # Whatever makes sense to you and known by zabbix server
 
+# Zabbix host macros we want to control through ansible
+# This is just a list of zabbix macro name and value to update
+# example:
+# zabbix_host_macros:
+#   - name: foo
+#     value: 5
+# Empty list by default so nothing to add/modify    
+zabbix_host_macros: []     

tasks/main.yml

@@ -108,3 +108,21 @@
     - pkg_install is not changed
     - zabbix_api_srv is defined
     - zabbix_api_srv != 'None'
+
+# applying host macros if defined
+- name: Reflecting host macros in zabbix
+  command:
+    cmd: "/usr/libexec/centos/zabbix_host_tool
+         -n {{ inventory_hostname }} 
+         -m {{ item.name }} 
+         -v {{ item.value }}
+         "
+  with_items: "{{ zabbix_host_macros }}"
+  register: zbx_macros_result
+  changed_when: "zbx_macros_result.rc == 2"
+  failed_when: "zbx_macros_result.rc == 1"
+  delegate_to: "{{ zabbix_api_srv }}"       
+  when: 
+    - zabbix_api_srv is defined
+    - zabbix_api_srv != 'None'
+