Senlin: Support uWSGI for API server

Currently Senlin 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: I8ec0db12f6002fad8cfde0c873b70279af891994

releasenotes/notes/senlin.yaml

@@ -12,4 +12,5 @@ senlin:
   - 0.2.7 Added OCI registry authentication
   - 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
 ...

senlin/Chart.yaml

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

senlin/templates/bin/_senlin-api.sh.tpl

@@ -18,8 +18,7 @@ set -ex
 COMMAND="${@:-start}"
 
 function start () {
-  exec senlin-api \
+  exec uwsgi --ini /etc/senlin/senlin-api-uwsgi.ini
-        --config-file /etc/senlin/senlin.conf
 }
 
 function stop () {

senlin/templates/configmap-etc.yaml

@@ -81,6 +81,15 @@ limitations under the License.
 {{- $_ := set .Values.conf.senlin.authentication "service_username" .Values.endpoints.identity.auth.senlin.username -}}
 {{- end -}}
 
+{{- if empty .Values.conf.senlin_api_uwsgi.uwsgi.processes -}}
+{{- $_ := set .Values.conf.senlin_api_uwsgi.uwsgi "processes" .Values.conf.senlin.senlin_api.workers -}}
+{{- end -}}
+{{- if empty (index .Values.conf.senlin_api_uwsgi.uwsgi "http-socket") -}}
+{{- $http_socket_port := tuple "clustering" "service" "api" . | include "helm-toolkit.endpoints.endpoint_port_lookup" | toString }}
+{{- $http_socket := printf "0.0.0.0:%s" $http_socket_port }}
+{{- $_ := set .Values.conf.senlin_api_uwsgi.uwsgi "http-socket" $http_socket -}}
+{{- end -}}
+
 {{- if and (empty .Values.conf.logging.handler_fluent) (has "fluent" .Values.conf.logging.handlers.keys) -}}
 {{- $fluentd_host := tuple "fluentd" "internal" $envAll | include "helm-toolkit.endpoints.hostname_namespaced_endpoint_lookup" }}
 {{- $fluentd_port := tuple "fluentd" "internal" "service" $envAll | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
@@ -102,6 +111,7 @@ type: Opaque
 data:
   rally_tests.yaml: {{ toYaml .Values.conf.rally_tests.tests | b64enc }}
   senlin.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.senlin | b64enc }}
+  senlin-api-uwsgi.ini: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.senlin_api_uwsgi | b64enc }}
   logging.conf: {{ include "helm-toolkit.utils.to_oslo_conf" .Values.conf.logging | b64enc }}
   api-paste.ini: {{ include "helm-toolkit.utils.to_ini" .Values.conf.paste | b64enc }}
   policy.yaml: {{ toYaml .Values.conf.policy | b64enc }}

senlin/templates/deployment-api.yaml

@@ -75,7 +75,7 @@ spec:
               scheme: HTTP
               path: /
               port: {{ tuple "clustering" "internal" "api" . | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
-            initialDelaySeconds: 15
+            initialDelaySeconds: 5
             periodSeconds: 10
           volumeMounts:
             - name: pod-tmp
@@ -88,6 +88,10 @@ spec:
               mountPath: /etc/senlin
             - name: pod-var-cache-senlin
               mountPath: /var/cache/senlin
+            - name: senlin-etc
+              mountPath: /etc/senlin/senlin-api-uwsgi.ini
+              subPath: senlin-api-uwsgi.ini
+              readOnly: true
             - name: senlin-etc
               mountPath: /etc/senlin/senlin.conf
               subPath: senlin.conf

senlin/values.yaml

@@ -204,6 +204,22 @@ conf:
     formatter_default:
       format: "%(message)s"
       datefmt: "%Y-%m-%d %H:%M:%S"
+  senlin_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: "senlin-api:"
+      route-user-agent: '^kube-probe.* donotlog:'
+      thunder-lock: true
+      worker-reload-mercy: 80
+      wsgi-file: /var/lib/openstack/bin/senlin-wsgi-api
 
 network:
   api: