Implement sync after restart

Signed-off-by: faizanahmad055 <faizan.ahmad55@outlook.com>

README.md

@@ -265,11 +265,12 @@ You can enable to scrape Reloader's Prometheus metrics by setting `serviceMonito
 
 **Note:** Reloading of OpenShift (DeploymentConfig) and/or Argo Rollouts has to be enabled explicitly because it might not be always possible to use it on a cluster with restricted permissions. This can be done by changing the following parameters:
 
-| Parameter        | Description                                                                  | Type    |
-| ---------------- |------------------------------------------------------------------------------| ------- |
-| isOpenshift      | Enable OpenShift DeploymentConfigs. Valid value are either `true` or `false` | boolean |
-| isArgoRollouts   | Enable Argo Rollouts. Valid value are either `true` or `false`               | boolean |
-| reloadOnCreate   | Enable reload on create events. Valid value are either `true` or `false`     | boolean |
+| Parameter        | Description                                                                                      | Type    |
+|------------------|--------------------------------------------------------------------------------------------------| ------- |
+| isOpenshift      | Enable OpenShift DeploymentConfigs. Valid value are either `true` or `false`                     | boolean |
+| isArgoRollouts   | Enable Argo Rollouts. Valid value are either `true` or `false`                                   | boolean |
+| reloadOnCreate   | Enable reload on create events. Valid value are either `true` or `false`                         | boolean |
+| syncAfterRestart | Enable sync after reloader restarts for **Add** events. Valid value are either `true` or `false` | boolean |
 
 **ReloadOnCreate** reloadOnCreate controls how Reloader handles secrets being added to the cache for the first time. If reloadOnCreate is set to true:
 * Configmaps/secrets being added to the cache will cause Reloader to perform a rolling update of the associated workload. 

deployments/kubernetes/chart/reloader/templates/deployment.yaml

@@ -204,6 +204,9 @@ spec:
           {{- if eq .Values.reloader.reloadOnCreate true }}
           - "--reload-on-create={{ .Values.reloader.reloadOnCreate }}"
           {{- end }}
+          {{- if eq .Values.reloader.syncAfterRestart true }}
+          - "--sync-after-restart={{ .Values.reloader.syncAfterRestart }}"
+          {{- end }}
           {{- if ne .Values.reloader.reloadStrategy "default" }}
           - "--reload-strategy={{ .Values.reloader.reloadStrategy }}"
           {{- end }}

deployments/kubernetes/chart/reloader/values.yaml

@@ -17,6 +17,7 @@ reloader:
   ignoreSecrets: false
   ignoreConfigMaps: false
   reloadOnCreate: false
+  syncAfterRestart: false
   reloadStrategy: default # Set to default, env-vars or annotations
   ignoreNamespaces: "" # Comma separated list of namespaces to ignore
   namespaceSelector: "" # Comma separated list of 'key:value' labels for namespaces selection

internal/pkg/cmd/reloader.go

@@ -44,6 +44,7 @@ func NewReloaderCommand() *cobra.Command {
 	cmd.PersistentFlags().StringVar(&options.ReloadStrategy, constants.ReloadStrategyFlag, constants.EnvVarsReloadStrategy, "Specifies the desired reload strategy")
 	cmd.PersistentFlags().StringVar(&options.ReloadOnCreate, "reload-on-create", "false", "Add support to watch create events")
 	cmd.PersistentFlags().BoolVar(&options.EnableHA, "enable-ha", false, "Adds support for running multiple replicas via leadership election")
+	cmd.PersistentFlags().BoolVar(&options.SyncAfterRestart, "sync-after-restart", false, "Sync add events after reloader restarts")
 
 	return cmd
 }

internal/pkg/controller/controller.go

@@ -31,6 +31,7 @@ type Controller struct {
 	queue             workqueue.RateLimitingInterface
 	informer          cache.Controller
 	namespace         string
+	resource          string
 	ignoredNamespaces util.List
 	collectors        metrics.Collectors
 	recorder          record.EventRecorder
@@ -38,17 +39,24 @@ type Controller struct {
 }
 
 // controllerInitialized flag determines whether controlled is being initialized
-var controllerInitialized bool = false
+var secretControllerInitialized bool = false
+var configmapControllerInitialized bool = false
 
 // NewController for initializing a Controller
 func NewController(
 	client kubernetes.Interface, resource string, namespace string, ignoredNamespaces []string, namespaceLabelSelector map[string]string, collectors metrics.Collectors) (*Controller, error) {
 
+	if options.SyncAfterRestart {
+		secretControllerInitialized = true
+		configmapControllerInitialized = true
+	}
+
 	c := Controller{
 		client:            client,
 		namespace:         namespace,
 		ignoredNamespaces: ignoredNamespaces,
 		namespaceSelector: namespaceLabelSelector,
+		resource:          resource,
 	}
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{
@@ -77,7 +85,7 @@ func NewController(
 // Add function to add a new object to the queue in case of creating a resource
 func (c *Controller) Add(obj interface{}) {
 	if options.ReloadOnCreate == "true" {
-		if !c.resourceInIgnoredNamespace(obj) && c.resourceInNamespaceSelector(obj) && controllerInitialized {
+		if !c.resourceInIgnoredNamespace(obj) && c.resourceInNamespaceSelector(obj) && secretControllerInitialized && configmapControllerInitialized {
 			c.queue.Add(handler.ResourceCreatedHandler{
 				Resource:   obj,
 				Collectors: c.collectors,
@@ -175,7 +183,11 @@ func (c *Controller) Run(threadiness int, stopCh chan struct{}) {
 
 func (c *Controller) runWorker() {
 	// At this point the controller is fully initialized and we can start processing the resources
-	controllerInitialized = true
+	if c.resource == "secrets" {
+		secretControllerInitialized = true
+	} else if c.resource == "configMaps" {
+		configmapControllerInitialized = true
+	}
 
 	for c.processNextItem() {
 	}

internal/pkg/options/flags.go

@@ -24,7 +24,8 @@ var (
 	// ReloadStrategy Specify the update strategy
 	ReloadStrategy = constants.EnvVarsReloadStrategy
 	// ReloadOnCreate Adds support to watch create events
-	ReloadOnCreate = "false"
+	ReloadOnCreate   = "false"
+	SyncAfterRestart = false
 	// EnableHA adds support for running multiple replicas via leadership election
 	EnableHA = false
 )