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

Inherits:
Kube::Cluster::Middleware show all
Defined in:
lib/kube/cluster/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"

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/middleware/ingress_for_service.rb', line 28

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

Instance Method Details

#call(manifest) ⇒ Object 



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# File 'lib/kube/cluster/middleware/ingress_for_service.rb', line 33

def call(manifest)
  generated = []

  manifest.resources.each do |resource|
    next unless resource.kind == "Service"

    host = resource.label(LABEL)
    next 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

    generated << Kube::Cluster["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 } } },
            }],
          },
        },
      ]
    }
  end

  manifest.resources.concat(generated)
end