Class: Kube::Cluster::Manifest::Middleware::IngressForService

Inherits:
Kube::Cluster::Manifest::Middleware show all
Defined in:
lib/kube/cluster/manifest/middleware/ingress_for_service.rb

Overview

Generates an Ingress for every Service whose source resource carries the app.kubernetes.io/expose label.

The label value is the hostname:

metadata.labels = { "app.kubernetes.io/expose": "app.example.com" }

Set to “true” to use the resource name as a hostname placeholder (useful when a later middleware or the manifest class resolves it).

Options:

issuer:          — cert-manager ClusterIssuer name (default: "letsencrypt-prod")
ingress_class:   — IngressClassName (default: "nginx")

stack do
  use Middleware::IngressForService
  use Middleware::IngressForService, issuer: "letsencrypt-staging"
end

Constant Summary collapse

LABEL = 
:"app.kubernetes.io/expose"

Constants inherited from Kube::Cluster::Manifest::Middleware

CLUSTER_SCOPED_KINDS, POD_BEARING_KINDS

Instance Method Summary collapse

Constructor Details

#initialize(issuer: "letsencrypt-prod", ingress_class: "nginx") ⇒ IngressForService

Returns a new instance of IngressForService.



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# File 'lib/kube/cluster/manifest/middleware/ingress_for_service.rb', line 29

def initialize(issuer: "letsencrypt-prod", ingress_class: "nginx")
  @issuer = issuer
  @ingress_class = ingress_class
end

Instance Method Details

#call(resource) ⇒ Object 



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# File 'lib/kube/cluster/manifest/middleware/ingress_for_service.rb', line 34

def call(resource)
  return resource unless kind(resource) == "Service"

  host = label(resource, LABEL)
  return resource unless host

  h = resource.to_h
  name      = h.dig(:metadata, :name)
  namespace = h.dig(:metadata, :namespace)
  labels    = h.dig(:metadata, :labels) || {}

  # Find the first port on the service
  port_name = Array(h.dig(:spec, :ports)).first&.dig(:name) || "http"

  # Use resource name as hostname fallback if label is just "true"
  host = "#{name}.local" if host == "true"

  # Capture ivars as locals — the block runs via instance_exec
  # on a BlackHoleStruct, so @ivars would resolve on the BHS.
  issuer        = @issuer
  ingress_class = @ingress_class

  ingress = Kube::Schema["Ingress"].new {
    metadata.name      = name
    metadata.namespace = namespace if namespace
    metadata.labels    = labels.reject { |k, _| k == LABEL }
    metadata.annotations = {
      "cert-manager.io/cluster-issuer":           issuer,
      "nginx.ingress.kubernetes.io/ssl-redirect": "true",
    }

    spec.ingressClassName = ingress_class
    spec.tls = [
      { hosts: [host], secretName: "#{name}-tls" },
    ]
    spec.rules = [
      {
        host: host,
        http: {
          paths: [{
            path:     "/",
            pathType: "Prefix",
            backend:  { service: { name: name, port: { name: port_name } } },
          }],
        },
      },
    ]
  }

  [resource, ingress]
end