types/config/context.go

package config

import (
	"context"

	"github.com/rancher/norman/controller"
	"github.com/rancher/norman/signal"
	appsv1beta2 "github.com/rancher/types/apis/apps/v1beta2"
	authzv1 "github.com/rancher/types/apis/authorization.cattle.io/v1"
	clusterv1 "github.com/rancher/types/apis/cluster.cattle.io/v1"
	corev1 "github.com/rancher/types/apis/core/v1"
	workloadv1 "github.com/rancher/types/apis/workload.cattle.io/v1"
	"github.com/sirupsen/logrus"
	"k8s.io/client-go/dynamic"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
)

type ClusterContext struct {
	RESTConfig        rest.Config
	UnversionedClient rest.Interface

	Cluster       clusterv1.Interface
	Authorization authzv1.Interface
}

func (c *ClusterContext) controllers() []controller.Starter {
	return []controller.Starter{
		c.Cluster,
		c.Authorization,
	}
}

type WorkloadContext struct {
	Cluster           *ClusterContext
	ClusterName       string
	RESTConfig        rest.Config
	UnversionedClient rest.Interface
	K8sClient         kubernetes.Interface

	Apps     appsv1beta2.Interface
	Workload workloadv1.Interface
	Core     corev1.Interface
}

func (w *WorkloadContext) controllers() []controller.Starter {
	return []controller.Starter{
		w.Apps,
		w.Workload,
		w.Core,
	}
}

func NewClusterContext(config rest.Config) (*ClusterContext, error) {
	var err error

	context := &ClusterContext{
		RESTConfig: config,
	}

	context.Cluster, err = clusterv1.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	context.Authorization, err = authzv1.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	dynamicConfig := config
	if dynamicConfig.NegotiatedSerializer == nil {
		configConfig := dynamic.ContentConfig()
		dynamicConfig.NegotiatedSerializer = configConfig.NegotiatedSerializer
	}

	context.UnversionedClient, err = rest.UnversionedRESTClientFor(&dynamicConfig)
	if err != nil {
		return nil, err
	}

	return context, err
}

func (c *ClusterContext) Start(ctx context.Context) error {
	logrus.Info("Starting cluster controllers")
	return controller.SyncThenSync(ctx, 5, c.controllers()...)
}

func (c *ClusterContext) StartAndWait() error {
	ctx := signal.SigTermCancelContext(context.Background())
	c.Start(ctx)
	<-ctx.Done()
	return ctx.Err()
}

func NewWorkloadContext(clusterConfig, config rest.Config, clusterName string) (*WorkloadContext, error) {
	var err error
	context := &WorkloadContext{
		RESTConfig:  config,
		ClusterName: clusterName,
	}

	context.Cluster, err = NewClusterContext(clusterConfig)
	if err != nil {
		return nil, err
	}

	context.K8sClient, err = kubernetes.NewForConfig(&config)
	if err != nil {
		return nil, err
	}

	context.Apps, err = appsv1beta2.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	context.Workload, err = workloadv1.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	context.Core, err = corev1.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	dynamicConfig := config
	if dynamicConfig.NegotiatedSerializer == nil {
		configConfig := dynamic.ContentConfig()
		dynamicConfig.NegotiatedSerializer = configConfig.NegotiatedSerializer
	}

	context.UnversionedClient, err = rest.UnversionedRESTClientFor(&dynamicConfig)
	if err != nil {
		return nil, err
	}

	return context, err
}

func (w *WorkloadContext) Start(ctx context.Context) error {
	logrus.Info("Starting workload controllers")
	controllers := w.Cluster.controllers()
	controllers = append(controllers, w.controllers()...)
	return controller.SyncThenSync(ctx, 5, controllers...)
}

func (w *WorkloadContext) StartAndWait() error {
	ctx := signal.SigTermCancelContext(context.Background())
	w.Start(ctx)
	<-ctx.Done()
	return ctx.Err()
}