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feat: flagd proxy resource ownership (#442)
Signed-off-by: James Milligan <james@omnant.co.uk>
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251 changes: 251 additions & 0 deletions
251
controllers/core/flagsourceconfiguration/flagd-proxy.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,251 @@ | ||
| package flagsourceconfiguration | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| corev1alpha1 "github.com/open-feature/open-feature-operator/apis/core/v1alpha1" | ||
| "github.com/open-feature/open-feature-operator/pkg/utils" | ||
| appsV1 "k8s.io/api/apps/v1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/util/intstr" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| ) | ||
|
|
||
| const ( | ||
| ManagedByAnnotationValue = "open-feature-operator" | ||
| FlagdProxyDeploymentName = "flagd-proxy" | ||
| FlagdProxyServiceAccountName = "open-feature-operator-flagd-proxy" | ||
| FlagdProxyServiceName = "flagd-proxy-svc" | ||
|
|
||
| envVarPodNamespace = "POD_NAMESPACE" | ||
| envVarProxyImage = "FLAGD_PROXY_IMAGE" | ||
| envVarProxyTag = "FLAGD_PROXY_TAG" | ||
| envVarProxyPort = "FLAGD_PROXY_PORT" | ||
| envVarProxyMetricsPort = "FLAGD_PROXY_METRICS_PORT" | ||
| envVarProxyDebugLogging = "FLAGD_PROXY_DEBUG_LOGGING" | ||
| defaultFlagdProxyImage = "ghcr.io/open-feature/flagd-proxy" | ||
| defaultFlagdProxyTag = "v0.2.0" //FLAGD_PROXY_TAG_RENOVATE | ||
| defaultFlagdProxyPort = 8015 | ||
| defaultFlagdProxyMetricsPort = 8016 | ||
| defaultFlagdProxyDebugLogging = false | ||
| defaultFlagdProxyNamespace = "open-feature-operator-system" | ||
| operatorDeploymentName = "open-feature-operator-controller-manager" | ||
| ) | ||
|
|
||
| type FlagdProxyHandler struct { | ||
| client.Client | ||
| config *FlagdProxyConfiguration | ||
| Log logr.Logger | ||
| } | ||
|
|
||
| type FlagdProxyConfiguration struct { | ||
| Port int | ||
| MetricsPort int | ||
| DebugLogging bool | ||
| Image string | ||
| Tag string | ||
| Namespace string | ||
| OperatorDeploymentName string | ||
| } | ||
|
|
||
| func NewFlagdProxyConfiguration() (*FlagdProxyConfiguration, error) { | ||
| config := &FlagdProxyConfiguration{ | ||
| Image: defaultFlagdProxyImage, | ||
| Tag: defaultFlagdProxyTag, | ||
| Namespace: defaultFlagdProxyNamespace, | ||
| OperatorDeploymentName: operatorDeploymentName, | ||
| } | ||
| ns, ok := os.LookupEnv(envVarPodNamespace) | ||
| if ok { | ||
| config.Namespace = ns | ||
| } | ||
| kpi, ok := os.LookupEnv(envVarProxyImage) | ||
| if ok { | ||
| config.Image = kpi | ||
| } | ||
| kpt, ok := os.LookupEnv(envVarProxyTag) | ||
| if ok { | ||
| config.Tag = kpt | ||
| } | ||
| port, err := utils.GetIntEnvVar(envVarProxyPort, defaultFlagdProxyPort) | ||
| if err != nil { | ||
| return config, err | ||
| } | ||
| config.Port = port | ||
|
|
||
| metricsPort, err := utils.GetIntEnvVar(envVarProxyMetricsPort, defaultFlagdProxyMetricsPort) | ||
| if err != nil { | ||
| return config, err | ||
| } | ||
| config.MetricsPort = metricsPort | ||
|
|
||
| kpDebugLogging, err := utils.GetBoolEnvVar(envVarProxyDebugLogging, defaultFlagdProxyDebugLogging) | ||
| if err != nil { | ||
| return config, err | ||
| } | ||
| config.DebugLogging = kpDebugLogging | ||
|
|
||
| return config, nil | ||
| } | ||
|
|
||
| func NewFlagdProxyHandler(config *FlagdProxyConfiguration, client client.Client, logger logr.Logger) *FlagdProxyHandler { | ||
| return &FlagdProxyHandler{ | ||
| config: config, | ||
| Client: client, | ||
| Log: logger, | ||
| } | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) Config() *FlagdProxyConfiguration { | ||
| return f.config | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) handleFlagdProxy(ctx context.Context, flagSourceConfiguration *corev1alpha1.FlagSourceConfiguration) error { | ||
| exists, err := f.doesFlagdProxyExist(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if !exists { | ||
| return f.deployFlagdProxy(ctx) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) deployFlagdProxy(ctx context.Context) error { | ||
| ownerReferences := []metav1.OwnerReference{} | ||
| ownerReference, err := f.getOwnerReference(ctx) | ||
| if err != nil { | ||
| f.Log.Error(err, "unable to create owner reference for open-feature-operator, not appending") | ||
| } else { | ||
| ownerReferences = append(ownerReferences, ownerReference) | ||
| } | ||
|
|
||
| f.Log.Info("deploying the flagd-proxy") | ||
| if err := f.Client.Create(ctx, f.newFlagdProxyManifest(ownerReferences)); err != nil && !errors.IsAlreadyExists(err) { | ||
| return err | ||
| } | ||
| f.Log.Info("deploying the flagd-proxy service") | ||
| if err := f.Client.Create(ctx, f.newFlagdProxyServiceManifest(ownerReferences)); err != nil && !errors.IsAlreadyExists(err) { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) newFlagdProxyServiceManifest(ownerReferences []metav1.OwnerReference) *corev1.Service { | ||
| return &corev1.Service{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: FlagdProxyServiceName, | ||
| Namespace: f.config.Namespace, | ||
| OwnerReferences: ownerReferences, | ||
| }, | ||
| Spec: corev1.ServiceSpec{ | ||
| Selector: map[string]string{ | ||
| "app.kubernetes.io/name": FlagdProxyDeploymentName, | ||
| "app.kubernetes.io/managed-by": ManagedByAnnotationValue, | ||
| }, | ||
| Ports: []corev1.ServicePort{ | ||
| { | ||
| Name: "flagd-proxy", | ||
| Port: int32(f.config.Port), | ||
| TargetPort: intstr.FromInt(f.config.Port), | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) newFlagdProxyManifest(ownerReferences []metav1.OwnerReference) *appsV1.Deployment { | ||
| replicas := int32(1) | ||
| args := []string{ | ||
| "start", | ||
| "--metrics-port", | ||
| fmt.Sprintf("%d", f.config.MetricsPort), | ||
| } | ||
| if f.config.DebugLogging { | ||
| args = append(args, "--debug") | ||
| } | ||
| return &appsV1.Deployment{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: FlagdProxyDeploymentName, | ||
| Namespace: f.config.Namespace, | ||
| Labels: map[string]string{ | ||
| "app": FlagdProxyDeploymentName, | ||
| "app.kubernetes.io/managed-by": ManagedByAnnotationValue, | ||
| "app.kubernetes.io/version": f.config.Tag, | ||
| }, | ||
| OwnerReferences: ownerReferences, | ||
| }, | ||
| Spec: appsV1.DeploymentSpec{ | ||
| Replicas: &replicas, | ||
| Selector: &metav1.LabelSelector{ | ||
| MatchLabels: map[string]string{ | ||
| "app": FlagdProxyDeploymentName, | ||
| }, | ||
| }, | ||
| Template: corev1.PodTemplateSpec{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Labels: map[string]string{ | ||
| "app": FlagdProxyDeploymentName, | ||
| "app.kubernetes.io/name": FlagdProxyDeploymentName, | ||
| "app.kubernetes.io/managed-by": ManagedByAnnotationValue, | ||
| "app.kubernetes.io/version": f.config.Tag, | ||
| }, | ||
| }, | ||
| Spec: corev1.PodSpec{ | ||
| ServiceAccountName: FlagdProxyServiceAccountName, | ||
| Containers: []corev1.Container{ | ||
| { | ||
| Image: fmt.Sprintf("%s:%s", f.config.Image, f.config.Tag), | ||
| Name: FlagdProxyDeploymentName, | ||
| Ports: []corev1.ContainerPort{ | ||
| { | ||
| Name: "port", | ||
| ContainerPort: int32(f.config.Port), | ||
| }, | ||
| { | ||
| Name: "metrics-port", | ||
| ContainerPort: int32(f.config.MetricsPort), | ||
| }, | ||
| }, | ||
| Args: args, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) doesFlagdProxyExist(ctx context.Context) (bool, error) { | ||
| d := &appsV1.Deployment{} | ||
| err := f.Client.Get(ctx, client.ObjectKey{Name: FlagdProxyDeploymentName, Namespace: f.config.Namespace}, d) | ||
| if err != nil { | ||
| if errors.IsNotFound(err) { | ||
| // does not exist, is not ready, no error | ||
| return false, nil | ||
| } | ||
| // does not exist, is not ready, is in error | ||
| return false, err | ||
| } | ||
| // exists, at least one replica ready, no error | ||
| return true, nil | ||
| } | ||
|
|
||
| func (f *FlagdProxyHandler) getOwnerReference(ctx context.Context) (metav1.OwnerReference, error) { | ||
| d := &appsV1.Deployment{} | ||
| if err := f.Client.Get(ctx, client.ObjectKey{Name: f.config.OperatorDeploymentName, Namespace: f.config.Namespace}, d); err != nil { | ||
| return metav1.OwnerReference{}, fmt.Errorf("unable to fetch operator deployment to create owner reference: %w", err) | ||
| } | ||
| return metav1.OwnerReference{ | ||
| UID: d.GetUID(), | ||
| Name: d.GetName(), | ||
| APIVersion: d.APIVersion, | ||
| Kind: d.Kind, | ||
| }, nil | ||
|
|
||
| } |
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