handlerIngress.go

/*

   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

   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 watcher

import (
	"log"
	"strconv"

	"github.com/apache/trafficserver-ingress-controller/endpoint"
	"github.com/apache/trafficserver-ingress-controller/util"

	nv1 "k8s.io/api/networking/v1"
)

// IgHandler implements EventHandler
type IgHandler struct {
	ResourceName string
	Ep           *endpoint.Endpoint
}

func (g *IgHandler) Add(obj interface{}) {
	log.Printf("In INGRESS_HANDLER ADD %#v \n", obj)
	g.add(obj)
	g.Ep.RedisClient.PrintAllKeys()
}

func (g *IgHandler) add(obj interface{}) {
	ingressObj, ok := obj.(*nv1.Ingress)
	if !ok {
		log.Println("In HandlerIngress Add; cannot cast to *nv1.Ingress")
		return
	}

	namespace := ingressObj.GetNamespace()
	// v1.18 ingress class name field in ingress object
	//ingressClass, _ := util.ExtractIngressClass(ingressObj.GetAnnotations())
	ingressClass, _ := util.ExtractIngressClassName(obj)
	if !g.Ep.NsManager.IncludeNamespace(namespace) || !g.Ep.ATSManager.IncludeIngressClass(ingressClass) {
		log.Println("Namespace not included or Ingress Class not matched")
		return
	}

	name := ingressObj.GetName()
	version := ingressObj.GetResourceVersion()
	nameversion := util.ConstructNameVersionString(namespace, name, version)

	// add the script before adding route
	snippet, snippetErr := util.ExtractServerSnippet(ingressObj.GetAnnotations())
	if snippetErr == nil {
		g.Ep.RedisClient.DBOneSAdd(nameversion, snippet)
	}

	// add default backend rules
	if ingressObj.Spec.DefaultBackend != nil {
		host := "*"
		scheme := "http"
		path := "/"
		pathType := nv1.PathTypePrefix
		hostPath := util.ConstructHostPathString(scheme, host, path, pathType)
		service := ingressObj.Spec.DefaultBackend.Service.Name
		port := strconv.Itoa(int(ingressObj.Spec.DefaultBackend.Service.Port.Number))
		svcport := util.ConstructSvcPortString(namespace, service, port)

		g.Ep.RedisClient.DBOneSAdd(hostPath, svcport)

		if snippetErr == nil {
			g.Ep.RedisClient.DBOneSAdd(hostPath, nameversion)
		}

		// add default backend rule for https as well
		scheme = "https"
		hostPath = util.ConstructHostPathString(scheme, host, path, pathType)

		g.Ep.RedisClient.DBOneSAdd(hostPath, svcport)

		if snippetErr == nil {
			g.Ep.RedisClient.DBOneSAdd(hostPath, nameversion)
		}
	}

	tlsHosts := make(map[string]string)

	for _, ingressTLS := range ingressObj.Spec.TLS {
		for _, tlsHost := range ingressTLS.Hosts {
			tlsHosts[tlsHost] = "1"
		}
	}

	for _, ingressRule := range ingressObj.Spec.Rules {
		host := ingressRule.Host
		if host == "" {
			host = "*"
		}
		scheme := "http"
		if _, ok := tlsHosts[host]; ok {
			scheme = "https"
		}

		for _, httpPath := range ingressRule.HTTP.Paths {

			path := httpPath.Path
			pathType := *httpPath.PathType
			hostPath := util.ConstructHostPathString(scheme, host, path, pathType)
			service := httpPath.Backend.Service.Name
			port := strconv.Itoa(int(httpPath.Backend.Service.Port.Number))
			svcport := util.ConstructSvcPortString(namespace, service, port)

			g.Ep.RedisClient.DBOneSAdd(hostPath, svcport)

			if snippetErr == nil {
				g.Ep.RedisClient.DBOneSAdd(hostPath, nameversion)
			}
		}

	}
}

// Update for EventHandler
func (g *IgHandler) Update(obj, newObj interface{}) {
	log.Printf("In INGRESS_HANDLER UPDATE %#v \n", newObj)
	g.update(obj, newObj)
	g.Ep.RedisClient.PrintAllKeys()
}

func (g *IgHandler) update(obj, newObj interface{}) {
	ingressObj, ok := obj.(*nv1.Ingress)
	if !ok {
		log.Println("In HandlerIngress Update; cannot cast to *nv1.Ingress")
		return
	}

	newIngressObj, ok := newObj.(*nv1.Ingress)
	if !ok {
		log.Println("In HandlerIngress Update; cannot cast to *nv1.Ingress")
		return
	}

	m := make(map[string]string)

	namespace := ingressObj.GetNamespace()
	// v1.18 ingress class name field in ingress object
	//ingressClass, _ := util.ExtractIngressClass(ingressObj.GetAnnotations())
	ingressClass, _ := util.ExtractIngressClassName(obj)
	if g.Ep.NsManager.IncludeNamespace(namespace) && g.Ep.ATSManager.IncludeIngressClass(ingressClass) {
		log.Println("Old Namespace included")

		name := ingressObj.GetName()
		version := ingressObj.GetResourceVersion()
		nameversion := util.ConstructNameVersionString(namespace, name, version)

		_, snippetErr := util.ExtractServerSnippet(ingressObj.GetAnnotations())

		// handle default backend rules
		if ingressObj.Spec.DefaultBackend != nil {
			host := "*"
			scheme := "http"
			path := "/"
			pathType := nv1.PathTypePrefix
			hostPath := util.ConstructHostPathString(scheme, host, path, pathType)

			g.Ep.RedisClient.DBOneSUnionStore("temp_"+hostPath, hostPath)
			m["temp_"+hostPath] = hostPath

			service := ingressObj.Spec.DefaultBackend.Service.Name
			port := strconv.Itoa(int(ingressObj.Spec.DefaultBackend.Service.Port.Number))
			svcport := util.ConstructSvcPortString(namespace, service, port)

			g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, svcport)

			if snippetErr == nil {
				g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, nameversion)
			}

			// handle default backend https rule
			scheme = "https"
			hostPath = util.ConstructHostPathString(scheme, host, path, pathType)

			g.Ep.RedisClient.DBOneSUnionStore("temp_"+hostPath, hostPath)
			m["temp_"+hostPath] = hostPath

			g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, svcport)

			if snippetErr == nil {
				g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, nameversion)
			}
		}

		tlsHosts := make(map[string]string)

		for _, ingressTLS := range ingressObj.Spec.TLS {
			for _, tlsHost := range ingressTLS.Hosts {
				tlsHosts[tlsHost] = "1"
			}
		}

		for _, ingressRule := range ingressObj.Spec.Rules {
			host := ingressRule.Host
			if host == "" {
				host = "*"
			}
			scheme := "http"
			if _, ok := tlsHosts[host]; ok {
				scheme = "https"
			}

			for _, httpPath := range ingressRule.HTTP.Paths {

				path := httpPath.Path
				pathType := *httpPath.PathType
				hostPath := util.ConstructHostPathString(scheme, host, path, pathType)

				g.Ep.RedisClient.DBOneSUnionStore("temp_"+hostPath, hostPath)
				m["temp_"+hostPath] = hostPath

				service := httpPath.Backend.Service.Name
				port := strconv.Itoa(int(httpPath.Backend.Service.Port.Number))
				svcport := util.ConstructSvcPortString(namespace, service, port)

				g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, svcport)

				if snippetErr == nil {
					g.Ep.RedisClient.DBOneSRem("temp_"+hostPath, nameversion)
				}
			}

		}
	}

	newNamespace := newIngressObj.GetNamespace()
	// v1.18 ingress class name field in ingress object
	//newIngressClass, _ := util.ExtractIngressClass(newIngressObj.GetAnnotations())
	newIngressClass, _ := util.ExtractIngressClassName(newObj)
	if g.Ep.NsManager.IncludeNamespace(newNamespace) && g.Ep.ATSManager.IncludeIngressClass(newIngressClass) {
		log.Println("New Namespace included")

		name := newIngressObj.GetName()
		version := newIngressObj.GetResourceVersion()
		nameversion := util.ConstructNameVersionString(newNamespace, name, version)

		newSnippet, newSnippetErr := util.ExtractServerSnippet(newIngressObj.GetAnnotations())
		if newSnippetErr == nil {
			g.Ep.RedisClient.DBOneSAdd(nameversion, newSnippet)
		}

		// handle default backend rule
		if newIngressObj.Spec.DefaultBackend != nil {
			host := "*"
			scheme := "http"
			path := "/"
			pathType := nv1.PathTypePrefix
			hostPath := util.ConstructHostPathString(scheme, host, path, pathType)

			service := newIngressObj.Spec.DefaultBackend.Service.Name
			port := strconv.Itoa(int(newIngressObj.Spec.DefaultBackend.Service.Port.Number))
			svcport := util.ConstructSvcPortString(newNamespace, service, port)

			g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, svcport)
			m["temp_"+hostPath] = hostPath

			if newSnippetErr == nil {
				g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, nameversion)
			}

			// handle default backend rule for https as well
			scheme = "https"
			hostPath = util.ConstructHostPathString(scheme, host, path, pathType)

			g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, svcport)
			m["temp_"+hostPath] = hostPath

			if newSnippetErr == nil {
				g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, nameversion)
			}
		}

		newTlsHosts := make(map[string]string)

		for _, newIngressTLS := range newIngressObj.Spec.TLS {
			for _, newTlsHost := range newIngressTLS.Hosts {
				newTlsHosts[newTlsHost] = "1"
			}
		}

		for _, ingressRule := range newIngressObj.Spec.Rules {
			host := ingressRule.Host
			if host == "" {
				host = "*"
			}
			scheme := "http"
			if _, ok := newTlsHosts[host]; ok {
				scheme = "https"
			}

			for _, httpPath := range ingressRule.HTTP.Paths {

				path := httpPath.Path
				pathType := *httpPath.PathType
				hostPath := util.ConstructHostPathString(scheme, host, path, pathType)

				service := httpPath.Backend.Service.Name
				port := strconv.Itoa(int(httpPath.Backend.Service.Port.Number))
				svcport := util.ConstructSvcPortString(newNamespace, service, port)

				g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, svcport)
				m["temp_"+hostPath] = hostPath

				if newSnippetErr == nil {
					g.Ep.RedisClient.DBOneSAdd("temp_"+hostPath, nameversion)
				}
			}

		}
	}

	for key, value := range m {
		g.Ep.RedisClient.DBOneSUnionStore(value, key)
		g.Ep.RedisClient.DBOneDel(key)
	}
}

// Delete for EventHandler
func (g *IgHandler) Delete(obj interface{}) {
	log.Printf("In INGRESS_HANDLER DELETE %#v \n", obj)
	g.delete(obj)
	g.Ep.RedisClient.PrintAllKeys()
}

// Helper for Deletes
func (g *IgHandler) delete(obj interface{}) {
	ingressObj, ok := obj.(*nv1.Ingress)
	if !ok {
		log.Println("In HandlerIngress Delete; cannot cast to *nv1.Ingress")
		return
	}

	namespace := ingressObj.GetNamespace()
	// v1.18 ingress class name field in ingress object
	//ingressClass, _ := util.ExtractIngressClass(ingressObj.GetAnnotations())
	ingressClass, _ := util.ExtractIngressClassName(obj)
	if !g.Ep.NsManager.IncludeNamespace(namespace) || !g.Ep.ATSManager.IncludeIngressClass(ingressClass) {
		log.Println("Namespace not included or Ingress Class not matched")
		return
	}

	name := ingressObj.GetName()
	version := ingressObj.GetResourceVersion()
	nameversion := util.ConstructNameVersionString(namespace, name, version)

	_, snippetErr := util.ExtractServerSnippet(ingressObj.GetAnnotations())

	if ingressObj.Spec.DefaultBackend != nil {
		host := "*"
		scheme := "http"
		path := "/"
		pathType := nv1.PathTypePrefix
		hostPath := util.ConstructHostPathString(scheme, host, path, pathType)
		service := ingressObj.Spec.DefaultBackend.Service.Name
		port := strconv.Itoa(int(ingressObj.Spec.DefaultBackend.Service.Port.Number))
		svcport := util.ConstructSvcPortString(namespace, service, port)

		g.Ep.RedisClient.DBOneSRem(hostPath, svcport)

		if snippetErr == nil {
			g.Ep.RedisClient.DBOneSRem(hostPath, nameversion)
		}

		scheme = "https"
		hostPath = util.ConstructHostPathString(scheme, host, path, pathType)

		g.Ep.RedisClient.DBOneSRem(hostPath, svcport)

		if snippetErr == nil {
			g.Ep.RedisClient.DBOneSRem(hostPath, nameversion)
		}
	}

	tlsHosts := make(map[string]string)

	for _, ingressTLS := range ingressObj.Spec.TLS {
		for _, tlsHost := range ingressTLS.Hosts {
			tlsHosts[tlsHost] = "1"
		}
	}

	for _, ingressRule := range ingressObj.Spec.Rules {
		host := ingressRule.Host
		if host == "" {
			host = "*"
		}
		scheme := "http"
		if _, ok := tlsHosts[host]; ok {
			scheme = "https"
		}

		for _, httpPath := range ingressRule.HTTP.Paths {

			path := httpPath.Path
			pathType := *httpPath.PathType
			hostPath := util.ConstructHostPathString(scheme, host, path, pathType)
			service := httpPath.Backend.Service.Name
			port := strconv.Itoa(int(httpPath.Backend.Service.Port.Number))
			svcport := util.ConstructSvcPortString(namespace, service, port)

			g.Ep.RedisClient.DBOneSRem(hostPath, svcport)

			if snippetErr == nil {
				g.Ep.RedisClient.DBOneSRem(hostPath, nameversion)
			}
		}

	}
}

// GetResourceName returns the resource name
func (g *IgHandler) GetResourceName() string {
	return g.ResourceName
}