Add zuul-preview service

This change adds an optional preview configuration to the spec:

  preview:
    image: docker.io/zuul/zuul-preview:latest
    count: 0

Change-Id: Id9d902b3b9f25b1bf3fa459634396d7520681417

conf/zuul/components/Preview.dhall

@@ -0,0 +1,40 @@
+let Kubernetes = ../../Kubernetes.dhall
+
+let F = ../functions.dhall
+
+let InputPreview = (../input.dhall).Preview.Type
+
+in      \(app-name : Text)
+    ->  \(image-name : Optional Text)
+    ->  \(data-dir : List F.Volume.Type)
+    ->  \(input-preview : InputPreview)
+    ->  F.KubernetesComponent::{
+        , Service = Some (F.mkService app-name "preview" "preview" 80)
+        , Deployment = Some
+            ( F.mkDeployment
+                app-name
+                F.Component::{
+                , name = "preview"
+                , count = F.defaultNat input-preview.count 0
+                , data-dir = data-dir
+                , container = Kubernetes.Container::{
+                  , name = "preview"
+                  , image = image-name
+                  , imagePullPolicy = Some "IfNotPresent"
+                  , ports = Some
+                    [ Kubernetes.ContainerPort::{
+                      , name = Some "preview"
+                      , containerPort = 80
+                      }
+                    ]
+                  , env = Some
+                    [ Kubernetes.EnvVar::{
+                      , name = "ZUUL_API_URL"
+                      , value = Some "http://web:9000"
+                      }
+                    ]
+                  , volumeMounts = Some (F.mkVolumeMount data-dir)
+                  }
+                }
+            )
+        }

conf/zuul/input.dhall

@@ -97,6 +97,10 @@ let Schemas =
               , public-url = None Text
               }
           }
+      , Preview =
+          { Type = { image : Optional Text, count : Optional Natural }
+          , default = { image = None Text, count = None Natural }
+          }
       , Launcher =
           { Type = { image : Optional Text, config : UserSecret }
           , default.image = None Text
@@ -143,6 +147,7 @@ let Input =
           , web : Schemas.Web.Type
           , scheduler : Schemas.Scheduler.Type
           , registry : Schemas.Registry.Type
+          , preview : Schemas.Preview.Type
           , launcher : Schemas.Launcher.Type
           , database : Optional UserSecret
           , zookeeper : Optional UserSecret
@@ -159,6 +164,7 @@ let Input =
           , web = Schemas.Web.default
           , scheduler = Schemas.Scheduler.default
           , registry = Schemas.Registry.default
+          , preview = Schemas.Preview.default
           , executor = Schemas.Executor.default
           , launcher = Schemas.Launcher.default
           , connections = Schemas.Connections.default

conf/zuul/resources.dhall

@@ -390,6 +390,12 @@ in      \(input : Input)
                             zuul-data-dir
                             [ etc-zuul-registry ]
                             input.registry
+                      , Preview =
+                          ./components/Preview.dhall
+                            input.name
+                            (zuul-image "preview")
+                            zuul-data-dir
+                            input.preview
                       }
               , Nodepool =
                   let nodepool-image =
@@ -586,6 +592,7 @@ in      \(input : Input)
                           # mkUnion Components.Zuul.Web
                           # mkUnion Components.Zuul.Merger
                           # mkUnion Components.Zuul.Registry
+                          # mkUnion Components.Zuul.Preview
                           # mkUnion Components.Nodepool.Launcher
                         )
                 }

playbooks/files/cr_spec.yaml

@@ -13,6 +13,8 @@ merger:
 scheduler:
   config:
     secretName: zuul-yaml-conf
+preview:
+  count: 0
 registry:
   count: 0
 launcher:

playbooks/zuul-operator-functional/run.yaml

@@ -134,6 +134,8 @@
               key: kube.config
           registry:
             count: 1
+          preview:
+            count: 1
           withCertManager: "{{ withCertManager }}"
 
     - name: Wait maximum 4 minutes for the scheduler deployment
@@ -172,6 +174,18 @@
       command: kubectl get Issuers zuul-ca -o yaml
       when: withCertManager
 
+    - name: Test the preview service
+      block:
+        - name: Get preview service ip
+          command: kubectl get svc preview -o "jsonpath={.spec.clusterIP}"
+          register: _preview_ip
+
+        - name: Connect to the preview service
+          uri:
+            url: "http://{{ _preview_ip.stdout_lines[0] }}"
+            method: POST
+            status_code: 403
+
     - name: Test the registry
       block:
         - name: Get registry service ip

roles/zuul/defaults/main.yaml

@@ -14,5 +14,6 @@ cert_manager: "{{ (raw_spec['withCertManager'] | default(true)) | bool }}"
 spec_defaults:
   web: {}
   registry: {}
+  preview: {}
   externalConfig: {}
   withCertManager: true