workload template to support readiness probes

server-template-probes.yml

apiVersion: carto.run/v1alpha1
kind: ClusterConfigTemplate
metadata:
  annotations:
    doc: |
      This template consumes an input named config which contains a
      PodTemplateSpec and returns a ConfigMap which contains a
      "delivery.yml" which contains a manifests for a Kubernetes
      Deployment which will run the templated pod, and a "service.yml"
      Kubernetes Service to expose the pods on the network.
  generation: 3
  name: server-probes
spec:
  configPath: .data
  healthRule:
    alwaysHealthy: {}
  lifecycle: mutable
  params:
  - default:
    - containerPort: 8080
      name: http
      port: 8080
    name: ports
  ytt: |

    #@ load("@ytt:data", "data")
    #@ load("@ytt:yaml", "yaml")
    #@ load("@ytt:struct", "struct")
    #@ load("@ytt:assert", "assert")
    #@ load("@ytt:overlay", "overlay")


    #@ def merge_labels(fixed_values):
    #@   labels = {}
    #@   if hasattr(data.values.workload.metadata, "labels"):
    #@     labels.update(data.values.workload.metadata.labels)
    #@   end
    #@   labels.update(fixed_values)
    #@   return labels
    #@ end

    #@ def intOrString(v):
    #@   return v if type(v) == "int" else int(v.strip()) if v.strip().isdigit() else v
    #@ end

    #@ def merge_ports(ports_spec, containers):
    #@   ports = {}
    #@   for c in containers:
    #@     for p in getattr(c, "ports", []):
    #@       ports[p.containerPort] = {"targetPort": p.containerPort, "port": p.containerPort, "name": getattr(p, "name", str(p.containerPort))}
    #@     end
    #@   end
    #@   for p in ports_spec:
    #@     targetPort = getattr(p, "containerPort", p.port)
    #@     type(targetPort) in ("string", "int") or fail("containerPort must be a string or int")
    #@     targetPort = intOrString(targetPort)
    #@
    #@     port = p.port
    #@     type(port) in ("string", "int") or fail("port must be a string or int")
    #@     port = int(port)
    #@     ports[p.port] = {"targetPort": targetPort, "port": port, "name": getattr(p, "name", str(p.port))}
    #@   end
    #@   return ports.values()
    #@ end

    #@ def addProbes():
    spec:
      containers:
      #@overlay/match by="name"
      - name: workload
        #@overlay/match missing_ok=True
        livenessProbe: #@ data.values.params.probes.livenessProbe
        #@overlay/match missing_ok=True
        readinessProbe: #@ data.values.params.probes.readinessProbe

    #@ end

    #@ def delivery():
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: #@ data.values.workload.metadata.name
      annotations:
        kapp.k14s.io/update-strategy: "fallback-on-replace"
        ootb.apps.tanzu.vmware.com/servicebinding-workload: "true"
        kapp.k14s.io/change-rule: "upsert after upserting servicebinding.io/ServiceBindings"
      labels: #@ merge_labels({ "app.kubernetes.io/component": "run", "carto.run/workload-name": data.values.workload.metadata.name })
    spec:
      selector:
        matchLabels: #@ data.values.config.metadata.labels
      template: #@ overlay.apply(data.values.config,addProbes())
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: #@ data.values.workload.metadata.name
      labels: #@ merge_labels({ "app.kubernetes.io/component": "run", "carto.run/workload-name": data.values.workload.metadata.name })
    spec:
      selector: #@ data.values.config.metadata.labels
      ports:
      #@ hasattr(data.values.params, "ports") and len(data.values.params.ports) or assert.fail("one or more ports param must be provided.")
      #@ declared_ports = {}
      #@ if "ports" in data.values.params:
      #@   declared_ports = data.values.params.ports
      #@ else:
      #@   declared_ports = struct.encode([{ "containerPort": 8080, "port": 8080, "name": "http"}])
      #@ end
      #@ for p in merge_ports(declared_ports, data.values.config.spec.containers):
      - #@ p
      #@ end
    #@ end

    ---
    apiVersion: v1
    kind: ConfigMap
    metadata:
      name: #@ data.values.workload.metadata.name + "-server"
      labels: #@ merge_labels({ "app.kubernetes.io/component": "config" })
    data:
      delivery.yml: #@ yaml.encode(delivery())