Add ability to get multiple hosts endpoint

For memcache we should set specify all hosts directly in the config
as client do key spreading based on what hosts are alive, when LB
address is used memcached can't work effectively.
This patch updates endpoint_host_lookup	to handle this scenario

Change-Id: I8c70f8e9e82bf18d04499a132ef9a016d02cea31

helm-toolkit/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Helm-Toolkit
 name: helm-toolkit
-version: 0.2.72
+version: 0.2.73
 home: https://docs.openstack.org/openstack-helm
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/OpenStack-Helm/OpenStack_Project_OpenStackHelm_vertical.png
 sources:

helm-toolkit/templates/endpoints/_host_and_port_endpoint_uri_lookup.tpl

@@ -14,7 +14,8 @@ limitations under the License.
 
 {{/*
 abstract: |
-  Resolves 'hostname:port' for an endpoint
+  Resolves 'hostname:port' for an endpoint, or several hostname:port pairs for statefulset e.g
+  'hostname1:port1,hostname2:port2,hostname3:port3',
 examples:
   - values: |
       endpoints:
@@ -46,6 +47,23 @@ examples:
       {{ tuple "oslo_db" "internal" "mysql" . | include "helm-toolkit.endpoints.host_and_port_endpoint_uri_lookup" }}
     return: |
       127.0.0.1:3306
+  - values: |
+      endpoints:
+        oslo_cache:
+          hosts:
+            default: memcached
+          host_fqdn_override:
+            default: null
+          statefulset:
+            name: openstack-memcached-memcached
+            replicas: 3
+          port:
+            memcache:
+              default: 11211
+    usage: |
+      {{ tuple "oslo_cache" "internal" "memcache" . | include "helm-toolkit.endpoints.host_and_port_endpoint_uri_lookup" }}
+    return: |
+      openstack-memcached-memcached-0:11211,openstack-memcached-memcached-1:11211,openstack-memcached-memcached-2:11211
 */}}
 
 {{- define "helm-toolkit.endpoints.host_and_port_endpoint_uri_lookup" -}}
@@ -53,7 +71,19 @@ examples:
 {{- $endpoint := index . 1 -}}
 {{- $port := index . 2 -}}
 {{- $context := index . 3 -}}
-{{- $endpointPort := tuple $type $endpoint $port $context | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
+{{- $ssMap := index $context.Values.endpoints ( $type | replace "-" "_" ) "statefulset" | default false -}}
-{{- $endpointHostname := tuple $type $endpoint $context | include "helm-toolkit.endpoints.endpoint_host_lookup" }}
+{{- $local := dict "endpointHosts" list -}}
-{{- printf "%s:%s" $endpointHostname $endpointPort -}}
+{{- $endpointPort := tuple $type $endpoint $port $context | include "helm-toolkit.endpoints.endpoint_port_lookup" -}}
+{{- if $ssMap -}}
+{{-   $endpointHostPrefix := $ssMap.name -}}
+{{-   $endpointHostSuffix := tuple $type $endpoint $context | include "helm-toolkit.endpoints.endpoint_host_lookup" }}
+{{-   range $podInt := until ( atoi (print $ssMap.replicas ) ) -}}
+{{-     $endpointHostname := printf "%s-%d.%s:%s" $endpointHostPrefix $podInt $endpointHostSuffix $endpointPort -}}
+{{-     $_ := set $local "endpointHosts" ( append $local.endpointHosts $endpointHostname ) -}}
+{{-   end -}}
+{{- else -}}
+{{-   $endpointHostname := tuple $type $endpoint $context | include "helm-toolkit.endpoints.endpoint_host_lookup" -}}
+{{-   $_ := set $local "endpointHosts" ( append $local.endpointHosts (printf "%s:%s" $endpointHostname $endpointPort) ) -}}
+{{- end -}}
+{{ include "helm-toolkit.utils.joinListWithComma" $local.endpointHosts }}
 {{- end -}}

releasenotes/notes/helm-toolkit.yaml

@@ -79,4 +79,5 @@ helm-toolkit:
   - 0.2.70 Decode url-encoded password for rabbit connection
   - 0.2.71 Add snippet with service parameters
   - 0.2.72 Add snippet configmap_oslo_policy
+  - 0.2.73 Add ability to get multiple hosts endpoint
 ...