Allow setting custom kibana host (#34)

* Allow setting custom kibana host

* Document kibana_host parameter

* Set default for kibana_host

* Allow RL to set host

class/defaults.yml

@@ -3,6 +3,7 @@ parameters:
     namespace: openshift-logging
     channel: 'stable'
     alerts: 'master'
+    kibana_host: null
     predict_elasticsearch_storage_alert:
       enabled: true
       lookback_range: 72h

component/kibana-host.libsonnet

@@ -0,0 +1,47 @@
+local common = import 'common.libsonnet';
+local kap = import 'lib/kapitan.libjsonnet';
+local kube = import 'lib/kube.libjsonnet';
+local resourceLocker = import 'lib/resource-locker.libjsonnet';
+local inv = kap.inventory();
+// The hiera parameters for the component
+local params = inv.parameters.openshift4_logging;
+
+local routeToPatch = kube._Object('route.openshift.io/v1', 'Route', 'kibana') {
+  metadata+: {
+    namespace: params.namespace,
+  },
+};
+
+local patch = resourceLocker.Patch(routeToPatch, {
+  spec: {
+    host: params.kibana_host,
+  },
+});
+
+// OpenShift has custom RBAC permissions on routes if you want to set a host ┻━┻︵ヽ(`Д´)ﾉ︵ ┻━┻
+local patchWithAdditionalPermissions = std.map(
+  function(obj)
+    if obj.apiVersion == 'rbac.authorization.k8s.io/v1' && obj.kind == 'Role' then
+      obj {
+        rules+: [
+          {
+            apiGroups: [
+              'route.openshift.io',
+            ],
+            resources: [
+              'routes/custom-host',
+            ],
+            verbs: [
+              '*',
+            ],
+          },
+        ],
+      }
+    else
+      obj
+  , patch
+);
+
+{
+  [if params.kibana_host != null then '32_kibana_host']: patchWithAdditionalPermissions,
+}

component/main.jsonnet

@@ -186,4 +186,4 @@ local namespace_groups = (
       },
     },
   '60_prometheus_rules': alert_rules.rules,
-}
+} + (import 'kibana-host.libsonnet')

docs/modules/ROOT/pages/references/parameters.adoc

@@ -36,6 +36,16 @@ default:: `master`
 Release version of the alerting rules.
 Should be adjusted according to the channel: If you specify `channel: stable-5.2` use `alerts: release-5.2`.
 
+== `kibana_host`
+
+[horizontal]
+type:: string
+default:: `null`
+example:: `kibana.apps.cluster.syn.tools`
+
+Host name of the Kibana route.
+
+
 == `predict_elasticsearch_storage_alert`
 
 [horizontal]