Optimize reconfigure action for telegraf

Change-Id: Ia658b0774ce009feb6b4e73363114f7922833835
Partially-implements: blueprint better-reconfigure

ansible/roles/telegraf/defaults/main.yml

 ---
 project_name: "telegraf"
 
+telegraf_services:
+  telegraf:
+    container_name: "telegraf"
+    image: "{{ telegraf_image_full }}"
+    enabled: true
+    pid_mode: "host"
+    group: "telegraf"
+    volumes:
+      - "{{ node_config_directory }}/telegraf/:{{ container_config_directory }}/:ro"
+      - "/etc/localtime:/etc/localtime:ro"
+      - "kolla_logs:/var/log/kolla/"
+      - "/sys:/rootfs/sys:ro"
+      - "/proc:/rootfs/proc:ro"
+      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+
+
 ####################
 # Docker
 ####################

ansible/roles/telegraf/handlers/main.yml

+---
+- name: Restart telegraf container
+  vars:
+    service_name: "telegraf"
+    service: "{{ telegraf_services[service_name] }}"
+    config_json: "{{ telegraf_config_jsons.results|selectattr('item.key', 'equalto', service_name)|first }}"
+    telegraf_container: "{{ check_telegraf_containers.results|selectattr('item.key', 'equalto', service_name)|first }}"
+  kolla_docker:
+    action: "recreate_or_restart_container"
+    common_options: "{{ docker_common_options }}"
+    name: "{{ service.container_name }}"
+    pid_mode: "{{ service.pid_mode }}"
+    environment:
+      HOST_PROC: "/rootfs/proc"
+      HOST_SYS: "/rootfs/sys"
+    image: "{{ service.image }}"
+    volumes: "{{ service.volumes|reject('equalto', '')|list }}"
+  when:
+    - action != "config"
+    - inventory_hostname in groups[service.group]
+    - service.enabled | bool
+    - config_json.changed | bool
+      or telegraf_confs.changed | bool
+      or telegraf_plugin.changed | bool
+      or telegraf_container.changed | bool

ansible/roles/telegraf/tasks/config.yml

 ---
 - name: Ensuring config directories exist
   file:
-    path: "{{ node_config_directory }}/{{ item }}"
+    path: "{{ node_config_directory }}/{{ item.key }}/config"
     state: "directory"
     recurse: yes
-  with_items:
-    - "telegraf"
-    - "telegraf/config"
+  when:
+    - inventory_hostname in groups[item.value.group]
+    - item.value.enabled | bool
+  with_dict: "{{ telegraf_services }}"
 
 - name: Copying over default config.json files
+  vars:
+    service: "{{ telegraf_services['telegraf_services'] }}"
   template:
     src: "telegraf.json.j2"
     dest: "{{ node_config_directory }}/telegraf/config.json"
+  register: telegraf_config_jsons
+  when:
+    - inventory_hostname in groups[item.value.group]
+    - item.value.enabled | bool
+  with_dict: "{{ telegraf_services }}"
+  notify:
+    - Restart telegraf container
 
 - name: Copying over telegraf config file
+  vars:
+    service: "{{ telegraf_services['telegraf'] }}"
   template:
     src: "telegraf.conf.j2"
     dest: "{{ node_config_directory }}/telegraf/telegraf.conf"
+  register: telegraf_confs
+  when:
+    - inventory_hostname in groups[service.group]
+    - service.enabled | bool
+  notify:
+    - Restart telegraf container
 
 - name: Copying over telegraf plugin files
+  vars:
+    service: "{{ telegraf_services['telegraf'] }}"
   copy:
     src: "{{ item }}"
     dest: "{{ node_config_directory }}/telegraf/config"
+  register: telegraf_plugin
+  when:
+    - inventory_hostname in groups[service.group]
+    - item.value.enabled | bool
   with_fileglob:
     - "{{ role_path }}/templates/config/*.conf"
+  notify:
+    - Restart telegraf container
+
+- name: Check telegraf containers
+  kolla_docker:
+    action: "compare_container"
+    common_options: "{{ docker_common_options }}"
+    name: "{{ item.value.container_name }}"
+    image: "{{ item.value.image }}"
+    volumes: "{{ item.value.volumes }}"
+  register: check_telegraf_containers
+  when:
+    - action != "config"
+    - inventory_hostname in groups[item.value.group]
+    - item.value.enabled | bool
+  with_dict: "{{ telegraf_services }}"
+  notify:
+    - Restart telegraf container

ansible/roles/telegraf/tasks/deploy.yml

 ---
 - include: config.yml
 
-- include: start.yml
+- name: Flush handlers
+  meta: flush_handlers

ansible/roles/telegraf/tasks/pull.yml

@@ -3,4 +3,8 @@
   kolla_docker:
     action: "pull_image"
     common_options: "{{ docker_common_options }}"
-    image: "{{ telegraf_image_full }}"
+    image: "{{ item.value.image }}"
+  when:
+    - inventory_hostname in groups[item.value.group]
+    - item.value.enabled | bool
+  with_dict: "{{ telegraf_services }}"

ansible/roles/telegraf/tasks/start.yml

----
-- name: Starting telegraf container
-  kolla_docker:
-    action: "start_container"
-    common_options: "{{ docker_common_options }}"
-    image: "{{ telegraf_image_full }}"
-    name: "telegraf"
-    environment:
-      HOST_PROC: "/rootfs/proc"
-      HOST_SYS: "/rootfs/sys"
-    volumes:
-      - "{{ node_config_directory }}/telegraf/:{{ container_config_directory }}/:ro"
-      - "/etc/localtime:/etc/localtime:ro"
-      - "kolla_logs:/var/log/kolla/"
-      - "/sys:/rootfs/sys:ro"
-      - "/proc:/rootfs/proc:ro"
-      - "/var/run/docker.sock:/var/run/docker.sock:ro"
-    pid_mode: "host"

ansible/roles/telegraf/tasks/upgrade.yml

 ---
 - include: config.yml
 
-- include: start.yml
+- name: Flush handlers
+  meta: flush_handlers