1 files changed, 40 insertions, 0 deletions
diff --git a/app/services/clusters/kubernetes/fetch_kubernetes_token_service.rb b/app/services/clusters/kubernetes/fetch_kubernetes_token_service.rb
new file mode 100644
index 00000000000..aaf437abfad
--- /dev/null
+++ b/app/services/clusters/kubernetes/fetch_kubernetes_token_service.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+module Clusters
+  module Kubernetes
+    class FetchKubernetesTokenService
+      DEFAULT_TOKEN_RETRY_DELAY = 5.seconds
+      TOKEN_RETRY_LIMIT = 5
+
+      attr_reader :kubeclient, :service_account_token_name, :namespace
+
+      def initialize(kubeclient, service_account_token_name, namespace, token_retry_delay: DEFAULT_TOKEN_RETRY_DELAY)
+        @kubeclient = kubeclient
+        @service_account_token_name = service_account_token_name
+        @namespace = namespace
+        @token_retry_delay = token_retry_delay
+      end
+
+      def execute
+        # Kubernetes will create the Secret and set the token asynchronously
+        # so it is necessary to retry
+        # https://kubernetes.io/docs/reference/access-authn-authz/service-accounts-admin/#token-controller
+        TOKEN_RETRY_LIMIT.times do
+          token_base64 = get_secret&.dig('data', 'token')
+          return Base64.decode64(token_base64) if token_base64
+
+          sleep @token_retry_delay
+        end
+
+        nil
+      end
+
+      private
+
+      def get_secret
+        kubeclient.get_secret(service_account_token_name, namespace).as_json
+      rescue Kubeclient::ResourceNotFoundError
+      end
+    end
+  end
+end