From 57b3c9e6602d172320251604b8654f0ed3a02e0b Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Tue, 4 Apr 2023 13:00:16 +0200 Subject: [PATCH] Initial commit --- LICENSE.md | 9 + README.md | 114 ++++++++ cmd/kubelish/cmd/add.go | 76 ++++++ cmd/kubelish/cmd/remove.go | 51 ++++ cmd/kubelish/cmd/root.go | 33 +++ cmd/kubelish/cmd/utils.go | 40 +++ cmd/kubelish/cmd/watch.go | 131 +++++++++ cmd/kubelish/main.go | 21 ++ go.mod | 56 ++++ go.sum | 504 +++++++++++++++++++++++++++++++++++ kubelish.service | 14 + pkg/k8s-watcher/watcher.go | 157 +++++++++++ pkg/meta/meta.go | 57 ++++ pkg/netif/netif.go | 56 ++++ pkg/publisher/avahi/avahi.go | 75 ++++++ pkg/publisher/avahi/stub.go | 8 + pkg/publisher/interface.go | 9 + 17 files changed, 1411 insertions(+) create mode 100644 LICENSE.md create mode 100644 README.md create mode 100644 cmd/kubelish/cmd/add.go create mode 100644 cmd/kubelish/cmd/remove.go create mode 100644 cmd/kubelish/cmd/root.go create mode 100644 cmd/kubelish/cmd/utils.go create mode 100644 cmd/kubelish/cmd/watch.go create mode 100644 cmd/kubelish/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 kubelish.service create mode 100644 pkg/k8s-watcher/watcher.go create mode 100644 pkg/meta/meta.go create mode 100644 pkg/netif/netif.go create mode 100644 pkg/publisher/avahi/avahi.go create mode 100644 pkg/publisher/avahi/stub.go create mode 100644 pkg/publisher/interface.go diff --git a/LICENSE.md b/LICENSE.md new file mode 100644 index 0000000..a80635a --- /dev/null +++ b/LICENSE.md @@ -0,0 +1,9 @@ +# MIT LICENSE + +Copyright (C) 2023 Holoplot GmbH + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..eda7b1e --- /dev/null +++ b/README.md @@ -0,0 +1,114 @@ +# kubelish - mDNS service publisher for Kubernetes cluster nodes + +This project implements a way to expose k8s services with external IPs as mDNS services. + +The rationale behind this project is to allow k8s services to be discovered by +devices on the local network dynamically, without the need to configure static IPs +or DNS entries. This is particularly useful for IoT devices, which are often unable +to become part of a traditional service mesh but need to access services of +the k8s cluster. + +In contrast to other solutions, this project exposes mDNS services (SRV records) +rather than hosts (A records) which has the advantage that the daemon can run +on multiple nodes of the same cluster that have IP addresses in the same subnet, +and offer the service on each of them. Clients will hence pick one of the nodes at +random. + +## How it works + +The `kubelish` daemon runs on each node of the cluster and listens for new `LoadBalancer` +services with external IPs. When a service is created or updated, the daemon checks +the annotations of the service to see if it should be exposed. + +The following keys are required: + +```yaml +metadata: + annotations: + kubelish/service-name: Example + kubelish/service-type: _example._tcp + kubelish/txt: Optional TXT record to be exposed along with the service on mDNS +``` + +If the service is annotated that way, and one of its external IP addresses is +a local IP address of the node the daemon is running on, the service will be +exposed as an mDNS service. + +If a service is deleted or updated to not be exposed, the daemon will remove +the mDNS service. + +## Running the daemon + +The daemon must be run natively on a node of the cluster, outside of Kubernetes. + +Install the daemon by using + +```bash +go install github.com/holoplot/kubelish/cmd/kubelish@latest +``` + +Then move the binary to a suitable location in your `$PATH`, e.g. `/usr/local/bin/kubelish`. + +The binary supports the following commands: + +- `kubelish watch` - Runs the watcher daemon +- `kubelish add ` - Adds annotations to a service to expose it as an mDNS service and dumps the YAML to stdout +- `kubelish remove ` - Removes annotations from a service and dumps the YAML to stdout + +A systemd service file is [kubelish.service](provided). Make sure you +edit the file to set the correct path to the binary and the kubeconfig file. + +### Global flags + +The following flags can be used with all commands: +* `--namespace` - Namespace to watch for services. Defaults to `default`. + +### Environment variables + +The environment variables below can be used to configure the daemon: + +- `KUBECONFIG` - Path to the kubeconfig file to use. Defaults to `~/.kube/config`. + +### Example + +Let's assume we have a service called `my-loadbalancer` in the `default` namespace that +you want to expose as an mDNS service. + +First, run the daemon on the node that has the IP address of the service: + +```bash +kubelish watch +``` + +Then, in a second terminal, add the annotations to the service using the following command: + +```bash +kubelish add my-loadbalancer --service-name example --service-type _example._tcp --txt Example \ + | kubectl apply -f - +``` + +The service should now be exposed as an mDNS service. You can verify this by using +the `avahi-browse` command: + +```bash +avahi-browse -r _example._tcp +``` + +To remove the service, run the following command: + +```bash +kubelish remove my-loadbalancer | kubectl apply -f - +``` + +## Limitations + +This project is still in its early stages and has some limitations: + +- Only supports Linux +- Depends on `avahi-daemon` to be installed on the host +- Only services with a single exposed port are supported +- Does not support miniKube's way of exposing services with `minikube tunnel` + +## License + +This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details. diff --git a/cmd/kubelish/cmd/add.go b/cmd/kubelish/cmd/add.go new file mode 100644 index 0000000..eea6311 --- /dev/null +++ b/cmd/kubelish/cmd/add.go @@ -0,0 +1,76 @@ +package cmd + +import ( + "github.com/holoplot/kubelish/pkg/meta" + "github.com/rs/zerolog/log" + "github.com/spf13/cobra" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/clientcmd" +) + +var ( + serviceName string + serviceType string + txt string +) + +func doAdd(cmd *cobra.Command, args []string) { + kubeConfig := getKubeConfig() + + if len(args) != 1 { + log.Fatal().Msg("You must specify a k8s service name") + } + + if serviceName == "" { + log.Fatal().Msg("You must specify an mDNS service name") + } + + if serviceType == "" { + log.Fatal().Msg("You must specify an mDNS service type") + } + + config, err := clientcmd.BuildConfigFromFlags("", kubeConfig) + + if err != nil { + log.Fatal().Err(err).Msg("Failed to build config from flags") + } + + clientSet, err := kubernetes.NewForConfig(config) + if err != nil { + log.Fatal().Err(err).Msg("Failed to create clientset") + } + + svc, err := clientSet.CoreV1().Services(namespace).Get(cmd.Context(), args[0], metav1.GetOptions{}) + if err != nil { + log.Fatal().Err(err).Msg("Failed to get service") + } + + an := meta.Annotations{ + ServiceName: serviceName, + ServiceType: serviceType, + Txt: txt, + } + + meta.AddAnnotationsToService(svc, &an) + + dumpServiceYAML(svc) +} + +func addCmd() *cobra.Command { + cmd := &cobra.Command{ + Use: "add ", + Short: "Add annotations to a Kubernetes service", + Long: "Add annotations to a Kubernetes service and print the resulting yaml to stdout", + Run: doAdd, + PreRun: func(cmd *cobra.Command, args []string) { + setupLogger() + }, + } + + cmd.Flags().StringVarP(&serviceName, "service-name", "s", "", "The mDNS service name") + cmd.Flags().StringVarP(&serviceType, "service-type", "t", "", "The mDNS service type") + cmd.Flags().StringVarP(&txt, "txt", "x", "", "The mDNS TXT record") + + return cmd +} diff --git a/cmd/kubelish/cmd/remove.go b/cmd/kubelish/cmd/remove.go new file mode 100644 index 0000000..a390086 --- /dev/null +++ b/cmd/kubelish/cmd/remove.go @@ -0,0 +1,51 @@ +package cmd + +import ( + "github.com/holoplot/kubelish/pkg/meta" + "github.com/rs/zerolog/log" + "github.com/spf13/cobra" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/clientcmd" +) + +func doRemove(cmd *cobra.Command, args []string) { + kubeConfig := getKubeConfig() + + if len(args) != 1 { + log.Fatal().Msg("You must specify a k8s service name") + } + + config, err := clientcmd.BuildConfigFromFlags("", kubeConfig) + + if err != nil { + log.Fatal().Err(err).Msg("Failed to build config from flags") + } + + clientSet, err := kubernetes.NewForConfig(config) + if err != nil { + log.Fatal().Err(err).Msg("Failed to create clientset") + } + + svc, err := clientSet.CoreV1().Services(namespace).Get(cmd.Context(), args[0], metav1.GetOptions{}) + if err != nil { + log.Fatal().Err(err).Msg("Failed to get service") + } + + meta.RemoveAnnotationsFromService(svc) + + dumpServiceYAML(svc) +} + +func removeCmd() *cobra.Command { + return &cobra.Command{ + Use: "remove ", + Long: `Remove annotations from a Kubernetes service and print the resulting yaml to stdout`, + Run: func(cmd *cobra.Command, args []string) { + doRemove(cmd, args) + }, + PreRun: func(cmd *cobra.Command, args []string) { + setupLogger() + }, + } +} diff --git a/cmd/kubelish/cmd/root.go b/cmd/kubelish/cmd/root.go new file mode 100644 index 0000000..7fcdb20 --- /dev/null +++ b/cmd/kubelish/cmd/root.go @@ -0,0 +1,33 @@ +package cmd + +import ( + "github.com/rs/zerolog/log" + "github.com/spf13/cobra" +) + +var ( + debug *bool + namespace string +) + +func Execute() { + rootCmd := &cobra.Command{ + Use: "kubelish", + Short: "kubelish is a service discovery tool for Kubernetes", + Long: `kubelish is a service discovery tool for Kubernetes. It publishes Kubernetes services to the local network using mDNS.`, + PersistentPreRun: func(cmd *cobra.Command, args []string) { + setupLogger() + }, + } + + debug = rootCmd.PersistentFlags().BoolP("debug", "d", false, "Enable debug log output") + rootCmd.PersistentFlags().StringVarP(&namespace, "namespace", "n", "default", "The namespace to operate on") + + rootCmd.AddCommand(addCmd()) + rootCmd.AddCommand(removeCmd()) + rootCmd.AddCommand(watchCmd()) + + if err := rootCmd.Execute(); err != nil { + log.Fatal().Err(err).Msg("Failed to execute root command") + } +} diff --git a/cmd/kubelish/cmd/utils.go b/cmd/kubelish/cmd/utils.go new file mode 100644 index 0000000..80eafeb --- /dev/null +++ b/cmd/kubelish/cmd/utils.go @@ -0,0 +1,40 @@ +package cmd + +import ( + "os" + "path/filepath" + + "github.com/rs/zerolog" + "github.com/rs/zerolog/log" + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/util/homedir" + "sigs.k8s.io/yaml" +) + +func setupLogger() { + if *debug { + zerolog.SetGlobalLevel(zerolog.DebugLevel) + } +} + +func getKubeConfig() string { + kubeConfig, ok := os.LookupEnv("KUBECONFIG") + if !ok { + kubeConfig = filepath.Join(homedir.HomeDir(), ".kube", "config") + } + return kubeConfig +} + +func dumpServiceYAML(svc *corev1.Service) { + svc.Kind = "Service" + svc.APIVersion = "v1" + svc.ManagedFields = make([]metav1.ManagedFieldsEntry, 0) + + b, err := yaml.Marshal(svc) + if err != nil { + log.Fatal().Err(err).Msg("Failed to marshal service") + } + + os.Stdout.Write(b) +} diff --git a/cmd/kubelish/cmd/watch.go b/cmd/kubelish/cmd/watch.go new file mode 100644 index 0000000..92f77eb --- /dev/null +++ b/cmd/kubelish/cmd/watch.go @@ -0,0 +1,131 @@ +package cmd + +import ( + "time" + + watcher "github.com/holoplot/kubelish/pkg/k8s-watcher" + "github.com/holoplot/kubelish/pkg/publisher" + avahi "github.com/holoplot/kubelish/pkg/publisher/avahi" + "github.com/okzk/sdnotify" + "github.com/rs/zerolog/log" + "github.com/spf13/cobra" + corev1 "k8s.io/api/core/v1" +) + +var ( + interfaces []string + publisherImpl string +) + +func doWatch(cmd *cobra.Command, args []string) { + kubeConfig := getKubeConfig() + var pub publisher.Publisher + + switch publisherImpl { + case "avahi": + var err error + pub, err = avahi.New() + if err != nil { + log.Fatal().Err(err).Msg("Failed to create Avahi publisher") + } + default: + log.Fatal().Str("publisher", publisherImpl).Msg("Unknown publisher") + } + + publishedServices := make(map[string]publisher.PublishedService) + + updateService := func(svc *corev1.Service, m *watcher.ServiceMDNS) { + if ps, ok := publishedServices[string(svc.UID)]; ok { + ps.Close() + // Give the network some time to digest the loss of a service. + // Otherwise the new service will replace the old one, but + // clients might miss it. + time.Sleep(2 * time.Second) + } + + if m == nil { + log.Info(). + Str("name", svc.Name). + Str("namespace", svc.Namespace). + Str("id", string(svc.UID)). + Msg("Service unpublished") + + return + } + + an := m.Annotations + if an == nil { + log.Debug(). + Str("name", svc.Name). + Str("namespace", svc.Namespace). + Str("id", string(svc.UID)). + Msg("No annotations found for service") + + return + } + + ps, err := pub.Publish(an.ServiceName, an.ServiceType, an.Txt, m.Port) + if err != nil { + log.Error().Err(err).Msg("Failed to publish service") + return + } + + publishedServices[string(svc.UID)] = ps + + log.Info(). + Str("name", svc.Name). + Str("namespace", svc.Namespace). + Str("mdns-name", an.ServiceName). + Str("mdns-type", an.ServiceType). + Str("txt", an.Txt). + Str("id", string(svc.UID)). + Msg("Service updated") + } + + deleteService := func(svc *corev1.Service, m *watcher.ServiceMDNS) { + if ps, ok := publishedServices[string(svc.UID)]; ok { + ps.Close() + } + + log.Info(). + Str("name", svc.Name). + Str("namespace", svc.Namespace). + Str("mdns-name", m.Annotations.ServiceName). + Str("mdns-type", m.Annotations.ServiceType). + Str("id", string(svc.UID)). + Msg("Service deleted") + } + + w, err := watcher.New(kubeConfig, namespace, corev1.ServiceTypeLoadBalancer, updateService, deleteService) + if err != nil { + log.Fatal(). + Err(err). + Str("namespace", namespace). + Msg("Failed to create watcher") + } + + log.Info().Msg("Watching for annotated Kubernetes services") + + sdnotify.Ready() + + <-cmd.Context().Done() + w.Close() +} + +func watchCmd() *cobra.Command { + cmd := &cobra.Command{ + Use: "watch", + Short: "Watch for changes in Kubernetes services and publish them to the local network", + Long: "Watch for changes in Kubernetes services and publish them to the local network", + Run: doWatch, + PreRun: func(cmd *cobra.Command, args []string) { + setupLogger() + }, + } + + cmd.Flags().StringArrayP("interface", "i", interfaces, + "Network interface to publish services on (can be specified multiple times) (default: all interfaces)") + cmd.Flags().StringVarP(&publisherImpl, "publisher", "p", "avahi", "mDNS Publisher to use") + + return cmd +} diff --git a/cmd/kubelish/main.go b/cmd/kubelish/main.go new file mode 100644 index 0000000..341394e --- /dev/null +++ b/cmd/kubelish/main.go @@ -0,0 +1,21 @@ +package main + +import ( + "time" + + "github.com/holoplot/kubelish/cmd/kubelish/cmd" + "github.com/mattn/go-colorable" + "github.com/rs/zerolog" + "github.com/rs/zerolog/log" +) + +func main() { + consoleWriter := zerolog.ConsoleWriter{ + Out: colorable.NewColorableStdout(), + TimeFormat: time.RFC3339, + } + + log.Logger = log.Output(consoleWriter) + + cmd.Execute() +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..3616a2e --- /dev/null +++ b/go.mod @@ -0,0 +1,56 @@ +module github.com/holoplot/kubelish + +go 1.19 + +require ( + github.com/godbus/dbus/v5 v5.0.4 + github.com/holoplot/go-avahi v1.0.1 + github.com/mattn/go-colorable v0.1.13 + github.com/okzk/sdnotify v0.0.0-20180710141335-d9becc38acbd + github.com/rs/zerolog v1.29.0 + github.com/spf13/cobra v1.7.0 + k8s.io/api v0.26.3 + k8s.io/apimachinery v0.26.3 + k8s.io/client-go v0.26.3 + sigs.k8s.io/yaml v1.3.0 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.9.0 // indirect + github.com/go-logr/logr v1.2.3 // indirect + github.com/go-openapi/jsonpointer v0.19.5 // indirect + github.com/go-openapi/jsonreference v0.20.0 // indirect + github.com/go-openapi/swag v0.19.14 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/google/gnostic v0.5.7-v3refs // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.1.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.6 // indirect + github.com/mattn/go-isatty v0.0.16 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/net v0.7.0 // indirect + golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect + golang.org/x/sys v0.5.0 // indirect + golang.org/x/term v0.5.0 // indirect + golang.org/x/text v0.7.0 // indirect + golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.28.1 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.90.1 // indirect + k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect + k8s.io/utils v0.0.0-20221107191617-1a15be271d1d // indirect + sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..609e300 --- /dev/null +++ b/go.sum @@ -0,0 +1,504 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod 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a/kubelish.service b/kubelish.service new file mode 100644 index 0000000..f3d44ba --- /dev/null +++ b/kubelish.service @@ -0,0 +1,14 @@ +[Unit] +Description=Kubernetes service discovery daemon +After=avahi-daemon.service + +[Service] +Type=notify +ExecStart=/usr/local/bin/kubelish --namespace default watch +Restart=always + +# Use the following to override the default configuration +#Environment=KUBECONFIG=/etc/kubernetes/readonly.conf + +[Install] +WantedBy=multi-user.target diff --git a/pkg/k8s-watcher/watcher.go b/pkg/k8s-watcher/watcher.go new file mode 100644 index 0000000..c904257 --- /dev/null +++ b/pkg/k8s-watcher/watcher.go @@ -0,0 +1,157 @@ +package watcher + +import ( + "fmt" + "net" + "reflect" + "sync" + "time" + + "github.com/holoplot/kubelish/pkg/meta" + corev1 "k8s.io/api/core/v1" + "k8s.io/client-go/informers" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/cache" + "k8s.io/client-go/tools/clientcmd" +) + +type Watcher struct { + onUpdate OnUpdateFunc + onDelete OnDeleteFunc + serviceType corev1.ServiceType + stopCh chan struct{} + + services map[string]*ServiceMDNS + servicesLock sync.Mutex +} + +type ServiceMDNS struct { + Annotations *meta.Annotations + IPs []net.IP + Port int +} + +type OnUpdateFunc func(*corev1.Service, *ServiceMDNS) +type OnDeleteFunc func(*corev1.Service, *ServiceMDNS) + +func (w *Watcher) meshDetails(svc *corev1.Service) *ServiceMDNS { + if svc.Spec.Type != corev1.ServiceType(w.serviceType) { + return nil + } + + service := &ServiceMDNS{} + + if service.Annotations = meta.AnnotationsFromService(svc); service.Annotations == nil { + return nil + } + + service.IPs = make([]net.IP, 0) + + for _, ip := range svc.Spec.ExternalIPs { + service.IPs = append(service.IPs, net.ParseIP(ip)) + } + + if len(svc.Spec.Ports) != 1 { + return nil + } + + if svc.Spec.Type == corev1.ServiceTypeLoadBalancer { + for _, ingress := range svc.Status.LoadBalancer.Ingress { + service.IPs = append(service.IPs, net.ParseIP(ingress.IP)) + } + } + + service.Port = int(svc.Spec.Ports[0].Port) + + return service +} + +func (w *Watcher) updateService(svc *corev1.Service) { + w.servicesLock.Lock() + defer w.servicesLock.Unlock() + + if m := w.meshDetails(svc); m != nil { + if e, ok := w.services[string(svc.UID)]; !ok || !reflect.DeepEqual(e, m) { + w.onUpdate(svc, m) + w.services[string(svc.UID)] = m + } + } else { + if _, ok := w.services[string(svc.UID)]; ok { + w.onUpdate(svc, nil) + delete(w.services, string(svc.UID)) + } + } +} + +func (w *Watcher) deleteService(svc *corev1.Service) { + if m := w.meshDetails(svc); m != nil { + w.servicesLock.Lock() + defer w.servicesLock.Unlock() + + delete(w.services, string(svc.UID)) + w.onDelete(svc, m) + } +} + +func (w *Watcher) addHandler(obj interface{}) { + if svc, ok := obj.(*corev1.Service); ok { + w.updateService(svc) + } +} + +func (w *Watcher) updateHandler(oldObj, newObj interface{}) { + if svc, ok := newObj.(*corev1.Service); ok { + w.updateService(svc) + } +} + +func (w *Watcher) deleteHandler(obj interface{}) { + if svc, ok := obj.(*corev1.Service); ok { + w.deleteService(svc) + } +} + +func (w *Watcher) Close() { + close(w.stopCh) +} + +func New(kubeConfigPath, namespace string, serviceType corev1.ServiceType, onUpdate OnUpdateFunc, onDelete OnDeleteFunc) (*Watcher, error) { + config, err := clientcmd.BuildConfigFromFlags("", kubeConfigPath) + if err != nil { + panic(err) + } + + clientSet, err := kubernetes.NewForConfig(config) + if err != nil { + panic(err) + } + + stopCh := make(chan struct{}) + factory := informers.NewSharedInformerFactoryWithOptions(clientSet, time.Minute, informers.WithNamespace(namespace)) + + svcInformer := factory.Core().V1().Services().Informer() + + go factory.Start(stopCh) + + if !cache.WaitForCacheSync(stopCh, svcInformer.HasSynced) { + return nil, fmt.Errorf("Timeout waiting for caches to sync") + } + + w := &Watcher{ + onUpdate: onUpdate, + onDelete: onDelete, + serviceType: serviceType, + stopCh: stopCh, + services: make(map[string]*ServiceMDNS), + } + + if _, err := svcInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{ + AddFunc: w.addHandler, + UpdateFunc: w.updateHandler, + DeleteFunc: w.deleteHandler, + }); err != nil { + return nil, err + } + + return w, nil +} diff --git a/pkg/meta/meta.go b/pkg/meta/meta.go new file mode 100644 index 0000000..e9dfb68 --- /dev/null +++ b/pkg/meta/meta.go @@ -0,0 +1,57 @@ +package meta + +import ( + "reflect" + + corev1 "k8s.io/api/core/v1" +) + +type Annotations struct { + ServiceName string + ServiceType string + Txt string +} + +const ( + serviceNameKey = "kubelish/service-name" + serviceTypeKey = "kubelish/service-type" + txtKey = "kubelish/txt" +) + +func (a *Annotations) Equal(b *Annotations) bool { + return reflect.DeepEqual(a, b) +} + +func (a *Annotations) Empty() bool { + return a == nil || (a.ServiceName == "" && a.ServiceType == "" && a.Txt == "") +} + +func AddAnnotationsToService(svc *corev1.Service, a *Annotations) { + svc.Annotations[serviceNameKey] = a.ServiceName + svc.Annotations[serviceTypeKey] = a.ServiceType + svc.Annotations[txtKey] = a.Txt +} + +func AnnotationsFromService(svc *corev1.Service) *Annotations { + a := &Annotations{} + + var ok bool + + if a.ServiceName, ok = svc.Annotations[serviceNameKey]; !ok { + return nil + } + + if a.ServiceType, ok = svc.Annotations[serviceTypeKey]; !ok { + return nil + } + + a.Txt = svc.Annotations[txtKey] + + return a +} + +func RemoveAnnotationsFromService(svc *corev1.Service) { + delete(svc.Annotations, serviceNameKey) + delete(svc.Annotations, serviceTypeKey) + delete(svc.Annotations, txtKey) +} diff --git a/pkg/netif/netif.go b/pkg/netif/netif.go new file mode 100644 index 0000000..bc28946 --- /dev/null +++ b/pkg/netif/netif.go @@ -0,0 +1,56 @@ +package netif + +import ( + "net" + + "github.com/rs/zerolog/log" +) + +type NetworkInterfaces []net.Interface + +func (ni NetworkInterfaces) WithIPs(ips []net.IP) NetworkInterfaces { + filtered := make([]net.Interface, 0) + + for _, iface := range ni { + if addrs, err := iface.Addrs(); err == nil { + for _, addr := range addrs { + for _, ip := range ips { + if _, n, err := net.ParseCIDR(addr.String()); err == nil { + if n.Contains(ip) { + filtered = append(filtered, iface) + } + } + } + } + } + } + + return filtered +} + +func Get(list []string) NetworkInterfaces { + if len(list) == 0 { + ret, err := net.Interfaces() + if err != nil { + log.Fatal().Err(err).Msg("Unable to get interfaces") + } + + return ret + } + + ret := make(NetworkInterfaces, 0) + + for _, name := range list { + iface, err := net.InterfaceByName(name) + if err != nil { + log.Warn(). + Err(err). + Str("name", name). + Msg("Failed to get interface, skipping") + } else { + ret = append(ret, *iface) + } + } + + return ret +} diff --git a/pkg/publisher/avahi/avahi.go b/pkg/publisher/avahi/avahi.go new file mode 100644 index 0000000..c53e73d --- /dev/null +++ b/pkg/publisher/avahi/avahi.go @@ -0,0 +1,75 @@ +//go:build linux +// +build linux + +package avahipublisher + +import ( + "fmt" + + dbus "github.com/godbus/dbus/v5" + "github.com/holoplot/go-avahi" + "github.com/holoplot/kubelish/pkg/publisher" + "github.com/rs/zerolog/log" +) + +type AvahiPublisher struct { + avahiServer *avahi.Server + hostnameFqdn string +} + +type PublishedAvahiService struct { + publisher *AvahiPublisher + entryGroup *avahi.EntryGroup +} + +func (p *PublishedAvahiService) Close() { + p.publisher.avahiServer.EntryGroupFree(p.entryGroup) +} + +func (a *AvahiPublisher) Publish(serviceName, serviceType, txt string, port int) (publisher.PublishedService, error) { + eg, err := a.avahiServer.EntryGroupNew() + if err != nil { + return nil, fmt.Errorf("EntryGroupNew() failed: %w", err) + } + + txtBytes := [][]byte{} + + if txt != "" { + txtBytes = [][]byte{[]byte(txt)} + } + + if err := eg.AddService(avahi.InterfaceUnspec, avahi.ProtoUnspec, 0, serviceName, + serviceType, "local", a.hostnameFqdn, uint16(port), txtBytes); err != nil { + return nil, fmt.Errorf("AddService() failed: %w", err) + } + + if err := eg.Commit(); err != nil { + return nil, fmt.Errorf("commit() failed: %w", err) + } + + return &PublishedAvahiService{publisher: a, entryGroup: eg}, nil +} + +func New() (*AvahiPublisher, error) { + dbusConn, err := dbus.SystemBus() + if err != nil { + return nil, err + } + + avahiServer, err := avahi.ServerNew(dbusConn) + if err != nil { + return nil, fmt.Errorf("avahi.ServerNew() failed: %w", err) + } + + hostname, err := avahiServer.GetHostNameFqdn() + if err != nil { + return nil, fmt.Errorf("GetHostNameFqdn() failed: %w", err) + } + + log.Info().Str("hostname", hostname).Msg("Starting Avahi publisher") + + return &AvahiPublisher{ + avahiServer: avahiServer, + hostnameFqdn: hostname, + }, nil +} diff --git a/pkg/publisher/avahi/stub.go b/pkg/publisher/avahi/stub.go new file mode 100644 index 0000000..8424600 --- /dev/null +++ b/pkg/publisher/avahi/stub.go @@ -0,0 +1,8 @@ +//go:build !linux +// +build !linux + +package avahipublisher + +func New() (*AvahiPublisher, error) { + return nil, fmt.Errorf("Avahi is not supported on this platform") +} diff --git a/pkg/publisher/interface.go b/pkg/publisher/interface.go new file mode 100644 index 0000000..53c803a --- /dev/null +++ b/pkg/publisher/interface.go @@ -0,0 +1,9 @@ +package publisher + +type Publisher interface { + Publish(serviceName, serviceType, txt string, port int) (PublishedService, error) +} + +type PublishedService interface { + Close() +}