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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,208 @@ | ||
| # frozen_string_literal: true | ||
| require 'kubernetes-deploy/kubernetes_resource' | ||
| require 'kubernetes-deploy/kubeclient_builder' | ||
| require 'erb' | ||
| require 'json' | ||
| require "jsonpath" | ||
|
|
||
| module KubernetesDeploy | ||
| class DiscoverableResource < KubernetesResource | ||
| extend KubernetesDeploy::KubeclientBuilder | ||
|
|
||
| TRUE_VALUES = [true, 1, '1', 't', 'T', 'true', 'TRUE'].to_set | ||
| DEPLOY_METADATA_ANNOTATION = 'kubernetes-deploy.shopify.io/metadata' | ||
|
|
||
| def self.child_classes | ||
| @child_classes ||= Set.new | ||
| end | ||
|
|
||
| def self.discover(context:, logger:, server_version:) | ||
| logger.info("Discovering custom resources:") | ||
| with_retries { discover_groups(context) } | ||
| if server_version >= Gem::Version.new('1.7.0') | ||
| kube_client = v1beta1_crd_kubeclient(context) | ||
| with_retries { discover_crd(v1beta1_crd_kubeclient(context)) } | ||
| end | ||
| end | ||
|
|
||
| def self.discover_groups(context) | ||
| kinds = discover_kinds(context) | ||
| kinds.each_pair do |key, val| | ||
| klass = get_static_class(kind: key) | ||
| next unless klass | ||
| klass.const_set(:GROUP, val[:group]) unless klass.constants.include?(:GROUP) | ||
| klass.const_set(:VERSION, val[:version]) unless klass.constants.include?(:VERSION) | ||
| end | ||
| end | ||
|
|
||
| def self.discover_kinds(context) | ||
| kinds = {} | ||
|
|
||
| # At the top level there is the core group (everything below /api/v1), | ||
| rest_client = v1_kubeclient(context).create_rest_client | ||
| raw_json = rest_client['v1'].get(rest_client.headers) | ||
| resource_list = JSON.parse(raw_json) | ||
| v1_group_version = { group: 'core', version: 'v1' } | ||
| resource_list['resources'].map do |res| | ||
| kind = res['kind'] | ||
| kinds[kind] = v1_group_version | ||
| end | ||
|
|
||
| # ...and the named groups (at path /apis/$NAME/$VERSION) | ||
| rest_client = apis_kubeclient(context).create_rest_client | ||
| raw_json = rest_client.get(rest_client.headers) | ||
| group_list = JSON.parse(raw_json) | ||
| group_versions = group_list['groups'] | ||
|
|
||
| # Map out all detected kinds to their (preferred) group version | ||
| group_versions.each do |group_version| | ||
| preferred_version = group_version['preferredVersion']['groupVersion'] | ||
| all_versions = group_version['versions'].map { |version| version['groupVersion']} | ||
| # Make sure the preferred version gets checked first. | ||
| all_versions.delete(preferred_version) | ||
| all_versions.unshift(preferred_version) | ||
|
|
||
| # Grab kinds from all versions | ||
| all_versions.each do |group_version| | ||
| raw_response = rest_client[group_version].get(rest_client.headers) | ||
| json_response = JSON.parse(raw_response) | ||
| resources = json_response['resources'] | ||
| resources.each do |res| | ||
| kind = res['kind'] | ||
| next if kinds.has_key?(kind) # Respect the preferred version | ||
| group, _, version = group_version.rpartition('/') | ||
| kinds[kind] = { group: group, version: version } | ||
| end | ||
| end | ||
| end | ||
|
|
||
| kinds | ||
| end | ||
|
|
||
| def self.build(namespace:, context:, definition:, logger:) | ||
| opts = { namespace: namespace, context: context, definition: definition, logger: logger } | ||
| kind = definition["kind"] | ||
| group, _, version = definition['apiVersion'].rpartition('/') | ||
|
|
||
| klass = get_static_class(kind: kind) | ||
| klass = get_dynamic_class(group: group, version: version, kind: kind) unless klass | ||
| klass.new(**opts) | ||
| end | ||
|
|
||
| def self.get_static_class(kind:) | ||
| KubernetesDeploy.const_get(kind) if KubernetesDeploy.const_defined?(kind) | ||
| end | ||
|
|
||
| def self.get_dynamic_class(group:, version:, kind:) | ||
| unless DiscoverableResource.const_defined?(kind) | ||
| generate_resource(group: group, version: version, kind: kind, annotations: {}) | ||
| end | ||
| DiscoverableResource.const_get(kind) | ||
| end | ||
|
|
||
| def self.with_retries(retries=3, backoff=10) | ||
| yield | ||
| rescue KubeException => err | ||
| if (retries -= 1) > 0 | ||
| logger.warn("Retrying to discover CustomResourceDefinitions: #{err}") | ||
| sleep(backoff) | ||
| retry | ||
| else | ||
| logger.warn("Unable to discover CustomResourceDefinitions: #{err}") | ||
| end | ||
| end | ||
|
|
||
| def self.discover_crd(client) | ||
| @child_classes = Set.new | ||
| resources = client.get_custom_resource_definitions | ||
| resources.each do |res| | ||
| kind = res.spec.names.kind | ||
| # Remove and redefine the class if it already exists so we can be up to date. | ||
| if DiscoverableResource.const_defined?(kind) | ||
| klass = DiscoverableResource.const_get(kind) | ||
| DiscoverableResource.send(:remove_const, kind) | ||
| child_classes.delete(klass) | ||
| end | ||
| generate_resource(group: res.spec.group, | ||
| version: res.spec.version, | ||
| kind: kind, | ||
| annotations: res.metadata.annotations) | ||
| end | ||
| end | ||
|
|
||
| def self.generate_resource(group:, kind:, version:, annotations:) | ||
| deploy_metadata = annotations[DEPLOY_METADATA_ANNOTATION] || '{}' | ||
| metadata = JSON.parse(deploy_metadata) | ||
| raise FatalDeploymentError, "Invalid metadata content: #{metadata}" unless metadata.is_a?(Hash) | ||
|
|
||
| prunable = parse_bool(metadata['prunable']) | ||
| predeploy = parse_bool(metadata['predeploy']) | ||
|
|
||
| status_field = metadata['status-field'] | ||
| success_status = metadata['status-success'] | ||
|
|
||
| resource_template = ERB.new <<-CLASS | ||
| class #{kind.capitalize} < DiscoverableResource | ||
| GROUP = '#{group}' | ||
| VERSION = '#{version}' | ||
| PREDEPLOY = #{predeploy} | ||
| PRUNABLE = #{prunable} | ||
| <% if status_field && success_status %> | ||
| def deploy_succeeded? | ||
| getter = "get_#{kind.downcase}" | ||
| @client ||= DiscoverableResource.kubeclient(context: @context, resource_class: self.class) | ||
| raw_json = @client.send(getter, @name, @namespace, as: :raw) | ||
| query_path = JsonPath.new('#{status_field}') | ||
| current_status = query_path.first(raw_json) | ||
| current_status == '#{success_status}' | ||
| end | ||
| <% end %> | ||
| self | ||
| end | ||
| CLASS | ||
|
|
||
| rendered_template = resource_template.result(binding) | ||
| resource_class = self.class_eval(rendered_template) | ||
| end | ||
|
|
||
| def self.parse_bool(value) | ||
| return true if TRUE_VALUES.include?(value) | ||
| false | ||
| end | ||
|
|
||
| def self.kubeclient(context:, resource_class:) | ||
| _build_kubeclient( | ||
| api_version: resource_class.version, | ||
| context: context, | ||
| endpoint_path: "/apis/#{resource_class.group}" | ||
| ) | ||
| end | ||
|
|
||
| def self.apis_kubeclient(context) | ||
| @apis_kubeclient ||= _build_kubeclient( | ||
| api_version: '', # The apis endpoint is not versioned | ||
| context: context, | ||
| endpoint_path: "/apis", | ||
| discover: false # Will fail on apis endpoint | ||
| ) | ||
| end | ||
|
|
||
| def self.v1_kubeclient(context) | ||
| @v1_kubeclient ||= build_v1_kubeclient(context) | ||
| end | ||
|
|
||
| def self.v1beta1_kubeclient(context) | ||
| @v1beta1_kubeclient ||= build_v1beta1_kubeclient(context) | ||
| end | ||
|
|
||
| def self.v1beta1_crd_kubeclient(context) | ||
| @v1beta1_kubeclient_crd ||= _build_kubeclient( | ||
| api_version: "v1beta1", | ||
| context: context, | ||
| endpoint_path: "/apis/apiextensions.k8s.io/" | ||
| ) | ||
| end | ||
| end | ||
| end |
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