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context.go
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context.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* https://opensource.org/licenses/Apache-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package app
import (
"fmt"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/wait"
cacheddiscovery "k8s.io/client-go/discovery/cached"
"k8s.io/client-go/restmapper"
"net/http"
"time"
versionedinformers "tkestack.io/tke/api/client/informers/externalversions"
"tkestack.io/tke/cmd/tke-notify-controller/app/config"
"tkestack.io/tke/pkg/controller"
"tkestack.io/tke/pkg/controller/util"
)
// InitFunc is used to launch a particular controller. It may run additional "should I activate checks".
// Any error returned will cause the controller process to `Fatal`
// The bool indicates whether the controller was enabled.
type InitFunc func(ctx ControllerContext) (debuggingHandler http.Handler, enabled bool, err error)
// ControllerContext represents the context of controller.
type ControllerContext struct {
// ClientBuilder will provide a client for this controller to use
ClientBuilder controller.ClientBuilder
// InformerFactory gives access to informers for the controller.
InformerFactory versionedinformers.SharedInformerFactory
// DeferredDiscoveryRESTMapper is a RESTMapper that will defer
// initialization of the RESTMapper until the first mapping is
// requested.
RESTMapper *restmapper.DeferredDiscoveryRESTMapper
// AvailableResources is a map listing currently available resources
AvailableResources map[schema.GroupVersionResource]bool
// Stop is the stop channel
Stop <-chan struct{}
// InformersStarted is closed after all of the controllers have been initialized and are running. After this point it is safe,
// for an individual controller to start the shared informers. Before it is closed, they should not.
InformersStarted chan struct{}
// ResyncPeriod generates a duration each time it is invoked; this is so that
// multiple controllers don't get into lock-step and all hammer the apiserver
// with list requests simultaneously.
ResyncPeriod func() time.Duration
ControllerStartInterval time.Duration
}
// IsControllerEnabled returns whether the controller has been enabled
func (c ControllerContext) IsControllerEnabled(name string) bool {
return util.IsControllerEnabled(name, ControllersDisabledByDefault)
}
// CreateControllerContext creates a context struct containing references to resources needed by the
// controllers such as the cloud provider and clientBuilder. rootClientBuilder is only used for
// the shared-informers client and token controller.
func CreateControllerContext(cfg *config.Config, rootClientBuilder controller.ClientBuilder, stop <-chan struct{}) (ControllerContext, error) {
versionedClient := rootClientBuilder.ClientOrDie("shared-informers")
sharedInformers := versionedinformers.NewSharedInformerFactory(versionedClient, controller.ResyncPeriod(&cfg.Component)())
// If apiserver is not running we should wait for some time and fail only then. This is particularly
// important when we start apiserver and controller manager at the same time.
if err := controller.WaitForAPIServer(versionedClient, 10*time.Second); err != nil {
return ControllerContext{}, fmt.Errorf("failed to wait for apiserver being healthy: %v", err)
}
// Use a discovery client capable of being refreshed.
discoveryClient := rootClientBuilder.ClientOrDie("controller-discovery")
cachedClient := cacheddiscovery.NewMemCacheClient(discoveryClient.Discovery())
restMapper := restmapper.NewDeferredDiscoveryRESTMapper(cachedClient)
go wait.Until(func() {
restMapper.Reset()
}, 5*time.Minute, stop)
availableResources, err := controller.GetAvailableResources(rootClientBuilder)
if err != nil {
return ControllerContext{}, err
}
ctx := ControllerContext{
ClientBuilder: rootClientBuilder,
InformerFactory: sharedInformers,
RESTMapper: restMapper,
AvailableResources: availableResources,
Stop: stop,
InformersStarted: make(chan struct{}),
ResyncPeriod: controller.ResyncPeriod(&cfg.Component),
ControllerStartInterval: cfg.Component.ControllerStartInterval,
}
return ctx, nil
}