Add uWSGI support to blazar

This patch adds uWSGI support to os_blazar role. All openstack services
should stay behind uWSGI.

It's also required for upcoming TLS backend feature. Blazar does not
have native TLS support so it needs to be handled by uWSGI.

Change-Id: I65511de4d5014a28f0f91536f9dbaf96fcb8e7a2

defaults/main.yml

@@ -93,9 +93,13 @@ blazar_services:
   blazar-api:
     group: blazar_all
     service_name: blazar-api
-    execstarts: "{{ blazar_bin }}/blazar-api {{ blazar_config_option }}"
     init_config_overrides: "{{ blazar_api_init_config_overrides }}"
     start_order: 1
+    wsgi_app: True
+    wsgi_name: blazar-api-wsgi
+    uwsgi_port: "{{ blazar_service_port }}"
+    uwsgi_bind_address: "{{ blazar_bind_address }}"
+    uwsgi_overrides: "{{ blazar_api_uwsgi_ini_overrides }}"
   blazar-manager:
     group: blazar_all
     service_name: blazar-manager
@@ -103,6 +107,12 @@ blazar_services:
     init_config_overrides: "{{ blazar_manager_init_config_overrides }}"
     start_order: 2
 
+# Blazar uWSGI settings
+blazar_wsgi_processes_max: 16
+blazar_wsgi_processes: "{{ [[(ansible_facts['processor_vcpus']//ansible_facts['processor_threads_per_core'])|default(1), 1] | max * 2, blazar_wsgi_processes_max] | min }}"
+blazar_wsgi_threads: 1
+blazar_wsgi_buffer_size: 65535
+
 ## Keystone
 blazar_service_project_domain_id: default
 blazar_service_project_name: service
@@ -156,3 +166,4 @@ blazar_policy_overrides: {}
 blazar_blazar_conf_overrides: {}
 blazar_api_init_config_overrides: {}
 blazar_manager_init_config_overrides: {}
+blazar_api_uwsgi_ini_overrides: {}

releasenotes/notes/uwsgi-support-70d9427de86555eb.yaml

@@ -0,0 +1,4 @@
+---
+other:
+  - |
+    uWSGI support was implemented to os_blazar role.

tasks/blazar_post_install.yml

@@ -36,3 +36,4 @@
       condition: "{{ (blazar_policy_overrides) }}"
   notify:
     - Restart blazar services
+    - Restart uwsgi services

tasks/main.yml

@@ -103,6 +103,16 @@
   tags:
     - blazar-config
 
+- name: Import uwsgi role
+  import_role:
+    name: uwsgi
+  vars:
+    uwsgi_services: "{{ uwsgi_blazar_services }}"
+    uwsgi_install_method: "source"
+  tags:
+    - blazar-config
+    - uwsgi
+
 - name: Run the systemd service role
   import_role:
     name: systemd_service

vars/main.yml

@@ -25,7 +25,8 @@ filtered_blazar_services: |-
   {% for key, value in blazar_services.items() %}
   {%   if (value['group'] in group_names) and
           (('condition' not in value) or
-           ('condition' in value and value['condition'])) %}
+           ('condition' in value and value['condition'])) and
+           not ('wsgi_app' in value and value['wsgi_app']) %}
   {%     set _ = value.update(
            {
              'service_key': key,
@@ -40,3 +41,24 @@ filtered_blazar_services: |-
   {%   endif %}
   {% endfor %}
   {{ services | sort(attribute='start_order') }}
+
+uwsgi_blazar_services: |-
+  {% set services = {} %}
+  {% for key, value in blazar_services.items() %}
+  {%   if (value['group'] in group_names) and
+         (('condition' not in value) or ('condition' in value and value['condition']))
+         and ('wsgi_app' in value and value['wsgi_app']) %}
+  {%     set _ = value.update(
+            {
+             'wsgi_path':  blazar_bin ~ '/' ~ value.wsgi_name,
+             'wsgi_venv': "{{ blazar_bin | dirname }}",
+             'uwsgi_uid': blazar_system_user_name,
+             'uwsgi_guid': blazar_system_group_name,
+             'uwsgi_processes': blazar_wsgi_processes,
+             'uwsgi_threads': blazar_wsgi_threads
+           }
+         ) %}
+  {%     set _ = services.update({key: value}) %}
+  {%   endif %}
+  {% endfor %}
+  {{ services }}