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kubernetes_manager.go
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kubernetes_manager.go
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package kubernetes
import (
"context"
"errors"
"fmt"
"os"
"sync"
"github.com/cisco-open/k8s-objectmatcher/patch"
"github.com/lestrrat-go/backoff/v2"
"github.com/rancher/opni/apis"
opnicorev1beta1 "github.com/rancher/opni/apis/core/v1beta1"
opniloggingv1beta1 "github.com/rancher/opni/apis/logging/v1beta1"
"github.com/rancher/opni/pkg/logger"
"github.com/rancher/opni/pkg/otel"
"github.com/rancher/opni/pkg/plugins/driverutil"
"github.com/rancher/opni/pkg/util/k8sutil"
"github.com/rancher/opni/pkg/util/k8sutil/provider"
opnimeta "github.com/rancher/opni/pkg/util/meta"
"github.com/rancher/opni/plugins/logging/apis/node"
"github.com/rancher/opni/plugins/logging/pkg/agent/drivers"
"github.com/samber/lo"
"go.uber.org/zap"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const (
secretName = "opni-opensearch-auth"
secretKey = "password"
dataPrepperName = "opni-shipper"
dataPrepperVersion = "2.0.1"
clusterOutputName = "opni-output"
clusterFlowName = "opni-flow"
loggingConfigName = "opni-logging"
)
type KubernetesManagerDriver struct {
KubernetesManagerDriverOptions
provider string
k8sClient client.Client
state reconcilerState
}
type reconcilerState struct {
sync.Mutex
running bool
backoffCtx context.Context
backoffCancel context.CancelFunc
}
type KubernetesManagerDriverOptions struct {
Namespace string `option:"namespace"`
RestConfig *rest.Config `option:"restConfig"`
Logger *zap.SugaredLogger `option:"logger"`
}
func NewKubernetesManagerDriver(options KubernetesManagerDriverOptions) (*KubernetesManagerDriver, error) {
scheme := apis.NewScheme()
if options.RestConfig == nil {
var err error
options.RestConfig, err = k8sutil.NewRestConfig(k8sutil.ClientOptions{
Scheme: scheme,
})
if err != nil {
return nil, fmt.Errorf("failed to create kubernetes client: %w", err)
}
}
clientset, err := kubernetes.NewForConfig(options.RestConfig)
if err != nil {
return nil, fmt.Errorf("failed to create clientset: %w", err)
}
provider, err := provider.DetectProvider(context.TODO(), clientset)
if err != nil {
return nil, fmt.Errorf("failed to get provider: %w", err)
}
k8sClient, err := client.New(options.RestConfig, client.Options{
Scheme: scheme,
})
if err != nil {
return nil, fmt.Errorf("failed to create kubernetes client: %w", err)
}
return &KubernetesManagerDriver{
KubernetesManagerDriverOptions: options,
k8sClient: k8sClient,
provider: provider,
}, nil
}
var _ drivers.LoggingNodeDriver = (*KubernetesManagerDriver)(nil)
func (m *KubernetesManagerDriver) ConfigureNode(config *node.LoggingCapabilityConfig) {
m.state.Lock()
if m.state.running {
m.state.backoffCancel()
}
m.state.running = true
ctx, ca := context.WithCancel(context.TODO())
m.state.backoffCtx = ctx
m.state.backoffCancel = ca
m.state.Unlock()
p := backoff.Exponential()
b := p.Start(ctx)
var success bool
BACKOFF:
for backoff.Continue(b) {
collectorConf := m.buildLoggingCollectorConfig()
if err := m.reconcileObject(collectorConf, config.Enabled); err != nil {
m.Logger.With(
"object", client.ObjectKeyFromObject(collectorConf).String(),
zap.Error(err),
).Error("error reconciling object")
continue BACKOFF
}
if err := m.reconcileCollector(config.Enabled); err != nil {
m.Logger.With(
"object", "opni collector",
zap.Error(err),
).Error("error reconciling object")
}
success = true
break
}
if !success {
m.Logger.Error("timed out reconciling objects")
} else {
m.Logger.Info("objects reconciled successfully")
}
}
func (m *KubernetesManagerDriver) buildLoggingCollectorConfig() *opniloggingv1beta1.CollectorConfig {
collectorConfig := &opniloggingv1beta1.CollectorConfig{
ObjectMeta: metav1.ObjectMeta{
Name: "opni-logging",
},
Spec: opniloggingv1beta1.CollectorConfigSpec{
Provider: opniloggingv1beta1.LogProvider(m.provider),
},
}
return collectorConfig
}
// TODO: make this generic
func (m *KubernetesManagerDriver) reconcileObject(desired client.Object, shouldExist bool) error {
// get the object
key := client.ObjectKeyFromObject(desired)
lg := m.Logger.With("object", key)
lg.Info("reconciling object")
// get the agent statefulset
agentStatefulSet, err := m.getAgentSet()
if err != nil {
return err
}
current := desired.DeepCopyObject().(client.Object)
err = m.k8sClient.Get(context.TODO(), key, current)
if client.IgnoreNotFound(err) != nil {
return err
}
// this can error if the object is cluster-scoped, but that's ok
controllerutil.SetOwnerReference(agentStatefulSet, desired, m.k8sClient.Scheme())
if k8serrors.IsNotFound(err) {
if !shouldExist {
lg.Info("object does not exist and should not exist, skipping")
return nil
}
lg.Info("object does not exist, creating")
// create the object
return m.k8sClient.Create(context.TODO(), desired)
} else if !shouldExist {
// delete the object
lg.Info("object exists and should not exist, deleting")
return m.k8sClient.Delete(context.TODO(), current)
}
// update the object
return m.patchObject(current, desired)
}
func (m *KubernetesManagerDriver) reconcileCollector(shouldExist bool) error {
coll := &opnicorev1beta1.Collector{
ObjectMeta: metav1.ObjectMeta{
Name: otel.CollectorName,
},
}
err := m.k8sClient.Get(context.TODO(), client.ObjectKeyFromObject(coll), coll)
if client.IgnoreNotFound(err) != nil {
return err
}
if k8serrors.IsNotFound(err) && shouldExist {
coll = m.buildEmptyCollector()
coll.Spec.LoggingConfig = &corev1.LocalObjectReference{
Name: loggingConfigName,
}
return m.k8sClient.Create(context.TODO(), coll)
}
err = retry.RetryOnConflict(retry.DefaultRetry, func() error {
err := m.k8sClient.Get(context.TODO(), client.ObjectKeyFromObject(coll), coll)
if err != nil {
return err
}
if shouldExist {
coll.Spec.LoggingConfig = &corev1.LocalObjectReference{
Name: loggingConfigName,
}
} else {
coll.Spec.LoggingConfig = nil
}
return m.k8sClient.Update(context.TODO(), coll)
})
return err
}
func (m *KubernetesManagerDriver) getAgentSet() (*appsv1.Deployment, error) {
list := &appsv1.DeploymentList{}
if err := m.k8sClient.List(context.TODO(), list,
client.InNamespace(m.Namespace),
client.MatchingLabels{
"opni.io/app": "agent",
},
); err != nil {
return nil, err
}
if len(list.Items) != 1 {
return nil, errors.New("deployments found not exactly 1")
}
return &list.Items[0], nil
}
func (m *KubernetesManagerDriver) getAgentService() (*corev1.Service, error) {
list := &corev1.ServiceList{}
if err := m.k8sClient.List(context.TODO(), list,
client.InNamespace(m.Namespace),
client.MatchingLabels{
"opni.io/app": "agent",
},
); err != nil {
return nil, err
}
if len(list.Items) != 1 {
return nil, errors.New("statefulsets found not exactly 1")
}
return &list.Items[0], nil
}
func (m *KubernetesManagerDriver) patchObject(current client.Object, desired client.Object) error {
// update the object
patchResult, err := patch.DefaultPatchMaker.Calculate(current, desired, patch.IgnoreStatusFields())
if err != nil {
m.Logger.With(
zap.Error(err),
).Warn("could not match objects")
return err
}
if patchResult.IsEmpty() {
m.Logger.Info("resource is in sync")
return nil
}
m.Logger.Info("resource diff")
if err := patch.DefaultAnnotator.SetLastAppliedAnnotation(desired); err != nil {
m.Logger.With(
zap.Error(err),
).Error("failed to set last applied annotation")
}
metaAccessor := meta.NewAccessor()
currentResourceVersion, err := metaAccessor.ResourceVersion(current)
if err != nil {
return err
}
if err := metaAccessor.SetResourceVersion(desired, currentResourceVersion); err != nil {
return err
}
m.Logger.Info("updating resource")
return m.k8sClient.Update(context.TODO(), desired)
}
func (m *KubernetesManagerDriver) buildEmptyCollector() *opnicorev1beta1.Collector {
var serviceName string
service, err := m.getAgentService()
if err == nil {
serviceName = service.Name
}
return &opnicorev1beta1.Collector{
ObjectMeta: metav1.ObjectMeta{
Name: otel.CollectorName,
},
Spec: opnicorev1beta1.CollectorSpec{
ImageSpec: opnimeta.ImageSpec{
ImagePullPolicy: lo.ToPtr(corev1.PullAlways),
},
SystemNamespace: m.Namespace,
AgentEndpoint: otel.AgentEndpoint(serviceName),
},
}
}
func init() {
drivers.NodeDrivers.Register("kubernetes-manager", func(_ context.Context, opts ...driverutil.Option) (drivers.LoggingNodeDriver, error) {
options := KubernetesManagerDriverOptions{
Namespace: os.Getenv("POD_NAMESPACE"),
Logger: logger.NewPluginLogger().Named("logging").Named("kubernetes-manager"),
}
driverutil.ApplyOptions(&options, opts...)
return NewKubernetesManagerDriver(options)
})
}