pkg/ingress/controller/apisix_route.go

// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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
//
//     http://www.apache.org/licenses/LICENSE-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 OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package controller

import (
	"context"

	"github.com/apache/apisix-ingress-controller/pkg/kube"

	apisixv1 "github.com/apache/apisix-ingress-controller/pkg/types/apisix/v1"

	"go.uber.org/zap"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/client-go/tools/cache"
	"k8s.io/client-go/util/workqueue"

	"github.com/apache/apisix-ingress-controller/pkg/log"
	"github.com/apache/apisix-ingress-controller/pkg/seven/state"
	"github.com/apache/apisix-ingress-controller/pkg/types"
)

type apisixRouteController struct {
	controller *Controller
	workqueue  workqueue.RateLimitingInterface
	workers    int
}

func (c *Controller) newApisixRouteController() *apisixRouteController {
	ctl := &apisixRouteController{
		controller: c,
		workqueue:  workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "ApisixRoute"),
		workers:    1,
	}
	c.apisixRouteInformer.AddEventHandler(
		cache.ResourceEventHandlerFuncs{
			AddFunc:    ctl.onAdd,
			UpdateFunc: ctl.onUpdate,
			DeleteFunc: ctl.onDelete,
		},
	)
	return ctl
}

func (c *apisixRouteController) run(ctx context.Context) {
	log.Info("ApisixRoute controller started")
	defer log.Info("ApisixRoute controller exited")
	ok := cache.WaitForCacheSync(ctx.Done(), c.controller.apisixRouteInformer.HasSynced)
	if !ok {
		log.Error("cache sync failed")
		return
	}

	for i := 0; i < c.workers; i++ {
		go c.runWorker(ctx)
	}
	<-ctx.Done()
	c.workqueue.ShutDown()
}

func (c *apisixRouteController) runWorker(ctx context.Context) {
	for {
		obj, quit := c.workqueue.Get()
		if quit {
			return
		}
		err := c.sync(ctx, obj.(*types.Event))
		c.workqueue.Done(obj)
		c.handleSyncErr(obj, err)
	}
}

func (c *apisixRouteController) sync(ctx context.Context, ev *types.Event) error {
	obj := ev.Object.(kube.ApisixRouteEvent)
	namespace, name, err := cache.SplitMetaNamespaceKey(obj.Key)
	if err != nil {
		log.Errorf("invalid resource key: %s", obj.Key)
		return err
	}
	var (
		ar        kube.ApisixRoute
		routes    []*apisixv1.Route
		upstreams []*apisixv1.Upstream
	)
	if obj.GroupVersion == kube.ApisixRouteV1 {
		ar, err = c.controller.apisixRouteLister.V1(namespace, name)
	} else {
		ar, err = c.controller.apisixRouteLister.V2alpha1(namespace, name)
	}

	if err != nil {
		if !k8serrors.IsNotFound(err) {
			log.Errorw("failed to get ApisixRoute",
				zap.String("version", obj.GroupVersion),
				zap.String("key", obj.Key),
				zap.Error(err),
			)
			return err
		}

		if ev.Type != types.EventDelete {
			log.Warnw("ApisixRoute was deleted before it can be delivered",
				zap.String("key", obj.Key),
				zap.String("version", obj.GroupVersion),
			)
			return nil
		}
	}
	if ev.Type == types.EventDelete {
		if ar != nil {
			// We still find the resource while we are processing the DELETE event,
			// that means object with same namespace and name was created, discarding
			// this stale DELETE event.
			log.Warnw("discard the stale ApisixRoute delete event since the resource still exists",
				zap.String("key", obj.Key),
			)
			return nil
		}
		ar = ev.Tombstone.(kube.ApisixRoute)
	}
	if obj.GroupVersion == kube.ApisixRouteV1 {
		routes, upstreams, err = c.controller.translator.TranslateRouteV1(ar.V1())
		if err != nil {
			log.Errorw("failed to translate ApisixRoute v1",
				zap.Error(err),
				zap.Any("object", ar),
			)
			return err
		}
	} else {
		routes, upstreams, err = c.controller.translator.TranslateRouteV2alpha1(ar.V2alpha1())
		if err != nil {
			log.Errorw("failed to translate ApisixRoute v2alpha1",
				zap.Error(err),
				zap.Any("object", ar),
			)
			return err
		}
	}

	log.Debugw("translated ApisixRoute",
		zap.Any("routes", routes),
		zap.Any("upstreams", upstreams),
		zap.Any("apisix_route", ar),
	)

	if ev.Type == types.EventDelete {
		rc := &state.RouteCompare{OldRoutes: routes, NewRoutes: nil}
		if err := rc.Sync(); err != nil {
			return err
		} else {
			comb := state.ApisixCombination{Routes: nil, Upstreams: upstreams}
			if err := comb.Remove(); err != nil {
				return err
			}
		}
		return nil
	} else if ev.Type == types.EventAdd {
		comb := state.ApisixCombination{Routes: routes, Upstreams: upstreams}
		if _, err := comb.Solver(); err != nil {
			return err
		}
	} else {
		var oldRoutes []*apisixv1.Route
		if obj.GroupVersion == kube.ApisixRouteV1 {
			oldRoutes, _, _ = c.controller.translator.TranslateRouteV1(ar.V1())
		} else {
			oldRoutes, _, _ = c.controller.translator.TranslateRouteV2alpha1(ar.V2alpha1())
		}
		rc := &state.RouteCompare{OldRoutes: oldRoutes, NewRoutes: routes}
		return rc.Sync()
	}
	return nil
}

func (c *apisixRouteController) handleSyncErr(obj interface{}, err error) {
	if err == nil {
		c.workqueue.Forget(obj)
		return
	}
	if c.workqueue.NumRequeues(obj) < _maxRetries {
		log.Infow("sync ApisixRoute failed, will retry",
			zap.Any("object", obj),
		)
		c.workqueue.AddRateLimited(obj)
	} else {
		c.workqueue.Forget(obj)
		log.Warnf("drop ApisixRoute %+v out of the queue", obj)
	}
}

func (c *apisixRouteController) onAdd(obj interface{}) {
	key, err := cache.MetaNamespaceKeyFunc(obj)
	if err != nil {
		log.Errorf("found ApisixRoute resource with bad meta namespace key: %s", err)
		return
	}
	if !c.controller.namespaceWatching(key) {
		return
	}
	log.Debugw("ApisixRoute add event arrived",
		zap.Any("object", obj))

	ar := kube.MustNewApisixRoute(obj)
	c.workqueue.AddRateLimited(&types.Event{
		Type: types.EventAdd,
		Object: kube.ApisixRouteEvent{
			Key:          key,
			GroupVersion: ar.GroupVersion(),
		},
	})
}

func (c *apisixRouteController) onUpdate(oldObj, newObj interface{}) {
	prev := kube.MustNewApisixRoute(oldObj)
	curr := kube.MustNewApisixRoute(newObj)
	if prev.ResourceVersion() >= curr.ResourceVersion() {
		return
	}
	key, err := cache.MetaNamespaceKeyFunc(newObj)
	if err != nil {
		log.Errorf("found ApisixRoute resource with bad meta namespace key: %s", err)
		return
	}
	if !c.controller.namespaceWatching(key) {
		return
	}
	c.workqueue.AddRateLimited(&types.Event{
		Type: types.EventUpdate,
		Object: kube.ApisixRouteEvent{
			Key:          key,
			GroupVersion: curr.GroupVersion(),
			OldObject:    prev,
		},
	})
}

func (c *apisixRouteController) onDelete(obj interface{}) {
	ar, err := kube.NewApisixRoute(obj)
	if err != nil {
		tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
		if !ok {
			return
		}
		ar = kube.MustNewApisixRoute(tombstone)
	}
	key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
	if err != nil {
		log.Errorf("found ApisixRoute resource with bad meta namesapce key: %s", err)
		return
	}
	if !c.controller.namespaceWatching(key) {
		return
	}
	log.Debugw("ApisixRoute delete event arrived",
		zap.Any("final state", ar),
	)
	c.workqueue.AddRateLimited(&types.Event{
		Type: types.EventDelete,
		Object: kube.ApisixRouteEvent{
			Key:          key,
			GroupVersion: ar.GroupVersion(),
		},
		Tombstone: ar,
	})
}