Designate: Support uWSGI for API server

Currently Designate API server still using eventlet-based HTTP servers,
it is generally considered more performant and flexible to run them
using a generic HTTP server that supports WSGI.

Change-Id: I8036ed5259c67ad1315815efa00eff80075b2ed2

designate/Chart.yaml

@@ -14,7 +14,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Designate
 name: designate
-version: 0.2.9
+version: 0.2.10
 home: https://docs.openstack.org/designate/latest/
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Designate/OpenStack_Project_Designate_vertical.jpg
 sources:

designate/templates/bin/_designate-api.sh.tpl

@@ -16,8 +16,7 @@ set -ex
 COMMAND="${@:-start}"
 
 function start () {
-  exec designate-api \
-      --config-file /etc/designate/designate.conf
+  exec uwsgi --ini /etc/designate/designate-api-uwsgi.ini
 }
 
 function stop () {

designate/templates/configmap-etc.yaml

@@ -65,6 +65,15 @@
 {{- if empty (index .Values.conf.designate "service:api").api_base_uri -}}
 {{- $_ := tuple "dns" "internal" "api" . | include "helm-toolkit.endpoints.keystone_endpoint_uri_lookup" | set (index .Values.conf.designate "service:api") "api_base_uri" -}}
 {{- end -}}
+
+{{- if empty .Values.conf.designate_api_uwsgi.uwsgi.processes -}}
+{{- $_ := set .Values.conf.designate_api_uwsgi.uwsgi "processes" (index .Values.conf.designate "service:api").workers -}}
+{{- end -}}
+{{- if empty (index .Values.conf.designate_api_uwsgi.uwsgi "http-socket") -}}
+{{- $http_socket_port := tuple "dns" "service" "api" . | include "helm-toolkit.endpoints.endpoint_port_lookup" | toString }}
+{{- $http_socket := printf "0.0.0.0:%s" $http_socket_port }}
+{{- $_ := set .Values.conf.designate_api_uwsgi.uwsgi "http-socket" $http_socket -}}
+{{- end -}}
 ---
 apiVersion: v1
 kind: Secret
@@ -73,6 +82,7 @@ metadata:
 type: Opaque
 data:
   designate.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.designate | b64enc }}
+  designate-api-uwsgi.ini: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.designate_api_uwsgi | b64enc }}
   api-paste.ini: {{ include "helm-toolkit.utils.to_ini" .Values.conf.paste | b64enc }}
   policy.yaml: {{ toYaml .Values.conf.policy | b64enc }}
   logging.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.logging | b64enc }}

designate/templates/deployment-api.yaml

@@ -92,6 +92,10 @@ spec:
               mountPath: /etc/designate/policy.yaml
               subPath: policy.yaml
               readOnly: true
+            - name: designate-etc
+              mountPath: /etc/designate/designate-api-uwsgi.ini
+              subPath: designate-api-uwsgi.ini
+              readOnly: true
             {{- if .Values.conf.designate.DEFAULT.log_config_append }}
             - name: designate-etc
               mountPath: {{ .Values.conf.designate.DEFAULT.log_config_append }}

designate/values.yaml

@@ -528,6 +528,22 @@ conf:
     formatter_default:
       format: "%(message)s"
       datefmt: "%Y-%m-%d %H:%M:%S"
+  designate_api_uwsgi:
+    uwsgi:
+      add-header: "Connection: close"
+      buffer-size: 65535
+      die-on-term: true
+      enable-threads: true
+      exit-on-reload: false
+      hook-master-start: unix_signal:15 gracefully_kill_them_all
+      lazy-apps: true
+      log-x-forwarded-for: true
+      master: true
+      procname-prefix-spaced: "designate-api:"
+      route-user-agent: '^kube-probe.* donotlog:'
+      thunder-lock: true
+      worker-reload-mercy: 80
+      wsgi-file: /var/lib/openstack/bin/designate-api-wsgi
 
 # Names of secrets used by bootstrap and environmental checks
 secrets:

releasenotes/notes/designate.yaml

@@ -13,4 +13,5 @@ designate:
   - 0.2.7 Use HTTP probe instead of TCP probe
   - 0.2.8 Remove default policy rules
   - 0.2.9 Define service_type in keystone_authtoken to support application credentials with access rules
+  - 0.2.10 Uses uWSGI for API service
 ...