forked from alibaba/sentinel-golang
/
k8s.go
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/
k8s.go
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package k8s
import (
"strings"
"github.com/qshuai/sentinel-golang/logging"
crdv1alpha1 "github.com/qshuai/sentinel-golang/pkg/datasource/k8s/api/v1alpha1"
"github.com/qshuai/sentinel-golang/pkg/datasource/k8s/controllers"
"github.com/qshuai/sentinel-golang/util"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
// +kubebuilder:scaffold:imports
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
func init() {
_ = clientgoscheme.AddToScheme(scheme)
_ = crdv1alpha1.AddToScheme(scheme)
// +kubebuilder:scaffold:scheme
}
type CRDType int32
const (
FlowRulesCRD CRDType = iota
IsolationRulesCRD
CircuitBreakerRulesCRD
HotspotRulesCRD
SystemRulesCRD
)
func (c CRDType) String() string {
switch c {
case FlowRulesCRD:
return "FlowRulesCRD"
case CircuitBreakerRulesCRD:
return "CircuitBreakerRulesCRD"
case HotspotRulesCRD:
return "HotspotRulesCRD"
case SystemRulesCRD:
return "SystemRulesCRD"
default:
return "Undefined"
}
}
type DataSource struct {
crdManager ctrl.Manager
controllers map[CRDType]reconcile.Reconciler
namespace string
stopChan chan struct{}
}
// NewDataSource creates a K8S DataSource with given namespace
// All Controllers take effective only when match namespace.
func NewDataSource(namespace string) (*DataSource, error) {
ctrl.SetLogger(&k8SLogger{
l: logging.GetGlobalLogger(),
level: logging.GetGlobalLoggerLevel(),
names: make([]string, 0),
keysAndValues: make([]interface{}, 0),
})
k8sConfig, err := ctrl.GetConfig()
if err != nil {
return nil, err
}
mgr, err := ctrl.NewManager(k8sConfig, ctrl.Options{
Scheme: scheme,
// disable metric server
MetricsBindAddress: "0",
HealthProbeBindAddress: "0",
LeaderElection: false,
})
if err != nil {
setupLog.Error(err, "unable to start manager")
return nil, err
}
k := &DataSource{
crdManager: mgr,
controllers: make(map[CRDType]reconcile.Reconciler, 4),
namespace: namespace,
stopChan: make(chan struct{}),
}
return k, nil
}
// RegisterController register given type crd and crd name
// For each type CRD can only register once.
func (k *DataSource) RegisterController(crd CRDType, crName string) error {
if len(strings.TrimSpace(crName)) == 0 {
return errors.New("empty crd name")
}
_, exist := k.controllers[crd]
if exist {
return errors.Errorf("duplicated register crd for %s", crd.String())
}
switch crd {
case FlowRulesCRD:
controller := &controllers.FlowRulesReconciler{
Client: k.crdManager.GetClient(),
Logger: ctrl.Log.WithName("controllers").WithName("FlowRules"),
Scheme: k.crdManager.GetScheme(),
Namespace: k.namespace,
ExpectedCrName: crName,
}
err := controller.SetupWithManager(k.crdManager)
if err != nil {
return err
}
k.controllers[FlowRulesCRD] = controller
setupLog.Info("succeed to register FlowRulesCRD Controller.")
return nil
case IsolationRulesCRD:
controller := &controllers.IsolationRulesReconciler{
Client: k.crdManager.GetClient(),
Logger: ctrl.Log.WithName("controllers").WithName("IsolationRules"),
Scheme: k.crdManager.GetScheme(),
Namespace: k.namespace,
ExpectedCrName: crName,
}
err := controller.SetupWithManager(k.crdManager)
if err != nil {
return err
}
k.controllers[IsolationRulesCRD] = controller
setupLog.Info("succeed to register IsolationRulesCRD Controller.")
return nil
case CircuitBreakerRulesCRD:
controller := &controllers.CircuitBreakerRulesReconciler{
Client: k.crdManager.GetClient(),
Logger: ctrl.Log.WithName("controllers").WithName("CircuitBreakerRules"),
Scheme: k.crdManager.GetScheme(),
Namespace: k.namespace,
ExpectedCrName: crName,
}
err := controller.SetupWithManager(k.crdManager)
if err != nil {
return err
}
k.controllers[CircuitBreakerRulesCRD] = controller
setupLog.Info("succeed to register CircuitBreakerRulesCRD Controller.")
return nil
case HotspotRulesCRD:
controller := &controllers.HotspotRulesReconciler{
Client: k.crdManager.GetClient(),
Logger: ctrl.Log.WithName("controllers").WithName("HotspotRules"),
Scheme: k.crdManager.GetScheme(),
Namespace: k.namespace,
ExpectedCrName: crName,
}
err := controller.SetupWithManager(k.crdManager)
if err != nil {
return err
}
k.controllers[HotspotRulesCRD] = controller
setupLog.Info("succeed to register HotspotRulesCRD Controller.")
return nil
case SystemRulesCRD:
controller := &controllers.SystemRulesReconciler{
Client: k.crdManager.GetClient(),
Logger: ctrl.Log.WithName("controllers").WithName("SystemRules"),
Scheme: k.crdManager.GetScheme(),
Namespace: k.namespace,
ExpectedCrName: crName,
}
err := controller.SetupWithManager(k.crdManager)
if err != nil {
return err
}
k.controllers[SystemRulesCRD] = controller
setupLog.Info("succeed to register SystemRulesCRD Controller.")
return nil
default:
return errors.Errorf("unsupported CRDType: %d", int(crd))
}
}
// Close exit the K8S DataSource
func (k *DataSource) Close() error {
k.stopChan <- struct{}{}
return nil
}
// Run runs the k8s DataSource
func (k *DataSource) Run() error {
// +kubebuilder:scaffold:builder
go util.RunWithRecover(func() {
setupLog.Info("starting manager")
if err := k.crdManager.Start(k.stopChan); err != nil {
setupLog.Error(err, "problem running manager")
}
setupLog.Info("k8s datasource exited")
})
return nil
}