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"

Constants inherited from Kube::Cluster::Middleware

DEFAULT_FILTER

Instance Method Summary collapse

Methods inherited from Kube::Cluster::Middleware

build, #filter, #initialize

Constructor Details

This class inherits a constructor from Kube::Cluster::Middleware

Instance Method Details

#call(manifest) ⇒ Object 



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# File 'lib/kube/cluster/middleware/ingress_for_service.rb', line 31

def call(manifest)
  generated = []
  issuer        = @opts.fetch(:issuer, "letsencrypt-prod")
  ingress_class = @opts.fetch(:ingress_class, "nginx")

  manifest.resources.each do |resource|
    filter(resource) do
      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"

      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
  end

  manifest.resources.concat(generated)
end