Merge pull request #1 from singleplatform-eng/Feature_service_state_and_removal

SPROD-7912 Feature service state and removal

Author: wwaltersp

README.md

@@ -46,7 +46,11 @@ An example of how to use the role
         celery_user: celery
         celery_services:
           - name: celeryd
+	    state: started
+	    enabled: yes
           - name: celery_beat
+	    state: stopped
+	    enabled: no
             environment:
               SINGLE_BEAT_IDENTIFIER: celery-beat
               SINGLE_BEAT_LOCK_TIME: 300

tasks/manage_configs.yml

@@ -1,5 +1,14 @@
 ---
+
 - name: Configure Celery EnvironmentFile
-  template: src=celery_env.j2 dest="{{celery_env_dir}}/{{item.name}}"
-  notify: "restart celery services"
+  template:
+    src: celery_env.j2
+    dest: "{{celery_env_dir}}/{{item.name}}"
+  with_items: "{{celery_services}}"
+
+- name: Configure Celery systemd service unit
+  template:
+    src: celery.service.j2
+    dest: "{{celery_env_dir}}/{{item.name}}.service"
+  register: "celery_states"
   with_items: "{{celery_services}}"

tasks/manage_units.yml

@@ -1,5 +1,57 @@
 ---
-- name: Configure Celery systemd service unit
-  template: src=celery.service.j2 dest="/etc/systemd/system/{{item.name}}.service"
-  notify: restart celery services
+
+- name: Link Service Unit
+  file:
+    src: "{{celery_env_dir}}/{{item.name}}.service"
+    dest: "/etc/systemd/system/{{item.name}}.service"
+    owner: root
+    group: root
+    state: link
+  with_items: "{{celery_services}}"
+
+- name: Get units configs
+  find:
+    path: "{{celery_env_dir}}/"
+    pattern: '^.*?\.service$'
+    use_regex: yes
+  register: service_configs
+  changed_when: false
+
+- name: Set file list
+  set_fact:
+    unmanaged_configs: "{{(service_configs.files|map(attribute='path')|map('basename')|map('replace', '.service','')|list)|reject('in', celery_services|map(attribute='name')|list)|list}}"
+  changed_when: false
+
+- name: Stop Unmanaged Service
+  systemd:
+    name: "{{item}}.service"
+    state: stopped
+  with_items: "{{unmanaged_configs}}"
+
+- name: Remove Unmanaged Services
+  file:
+    dest: "/etc/systemd/system/{{item}}.service"
+    owner: root
+    group: root
+    state: absent
+  register: removed_services
+  with_items: "{{unmanaged_configs}}"
+
+- name: Detect Changes
+  command: /bin/true
+  register: celery_services_state
+  when: item.changed
+  with_items: "{{celery_states.results + removed_services.results}}"
+
+- name: Reload systemd daemon
+  systemd:
+    daemon_reload: yes
+  when: celery_services_state is changed
+
+- name: Enable Service
+  systemd:
+    name: "{{item.name}}.service"
+    state: "{{item.state|default('stopped')}}"
+    enabled: yes
+  when: item.enabled|default(False)|bool
   with_items: "{{celery_services}}"

tests/test.sh

@@ -67,6 +67,9 @@ printf ${green}"Testing Start Handlers and Service\n"${neutral}
 docker exec $container_id ansible-playbook /etc/ansible/roles/role_under_test/tests/$playbook -e 'test_handlers=True test_service=True'
 printf ${green}"Handlers and Service test passed\n"${neutra}
 
+printf ${green}"Testing Service Removal\n"${neutral}
+docker exec $container_id ansible-playbook /etc/ansible/roles/role_under_test/tests/$playbook -e 'service_test=True'
+printf ${green}"Service Removal test passed\n"${neutra}
 
 # Remove the Docker container (if configured).
 if [ "$cleanup" = true ]; then

tests/test.yml

@@ -65,3 +65,22 @@
           command: echo stopping celery
           notify: stop celery services
       when: test_handlers is defined
+
+- hosts: localhost
+  remote_user: root
+  roles:
+    - { role: role_under_test, when: service_test is defined, celery_working_dir: /srv, celery_app: tasks, celery_user: celery, celery_services: []}
+  tasks:
+    - name: Fail To start Celery
+      systemd:
+        name: celeryd
+        state: stopped
+      register: failed_start
+      failed_when: false
+      when: service_test is defined
+
+    - name: Assert failure
+      assert:
+        that:
+          - "'Could not find the requested service celeryd' in failed_start.msg"
+      when: service_test is defined