328 lines
10 KiB
Go
328 lines
10 KiB
Go
package provider
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import (
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"fmt"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/provider/k8s"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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"io/ioutil"
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"os"
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"reflect"
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"strconv"
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"strings"
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"text/template"
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"time"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/job"
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)
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const (
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serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token"
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serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
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defaultKubeEndpoint = "http://127.0.0.1:8080"
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)
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// Namespaces holds kubernetes namespaces
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type Namespaces []string
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//Set adds strings elem into the the parser
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//it splits str on , and ;
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func (ns *Namespaces) Set(str string) error {
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fargs := func(c rune) bool {
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return c == ',' || c == ';'
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}
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// get function
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slice := strings.FieldsFunc(str, fargs)
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*ns = append(*ns, slice...)
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return nil
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}
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//Get []string
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func (ns *Namespaces) Get() interface{} { return Namespaces(*ns) }
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//String return slice in a string
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func (ns *Namespaces) String() string { return fmt.Sprintf("%v", *ns) }
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//SetValue sets []string into the parser
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func (ns *Namespaces) SetValue(val interface{}) {
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*ns = Namespaces(val.(Namespaces))
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}
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var _ Provider = (*Kubernetes)(nil)
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// Kubernetes holds configurations of the Kubernetes provider.
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type Kubernetes struct {
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BaseProvider `mapstructure:",squash"`
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Endpoint string `description:"Kubernetes server endpoint"`
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DisablePassHostHeaders bool `description:"Kubernetes disable PassHost Headers"`
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Namespaces Namespaces `description:"Kubernetes namespaces"`
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LabelSelector string `description:"Kubernetes api label selector to use"`
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lastConfiguration safe.Safe
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}
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func (provider *Kubernetes) createClient() (k8s.Client, error) {
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var token string
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tokenBytes, err := ioutil.ReadFile(serviceAccountToken)
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if err == nil {
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token = string(tokenBytes)
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log.Debugf("Kubernetes token: %s", token)
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} else {
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log.Errorf("Kubernetes load token error: %s", err)
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}
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caCert, err := ioutil.ReadFile(serviceAccountCACert)
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if err == nil {
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log.Debugf("Kubernetes CA cert: %s", serviceAccountCACert)
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} else {
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log.Errorf("Kubernetes load token error: %s", err)
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}
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kubernetesHost := os.Getenv("KUBERNETES_SERVICE_HOST")
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kubernetesPort := os.Getenv("KUBERNETES_SERVICE_PORT_HTTPS")
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// Prioritize user provided kubernetes endpoint since kube container runtime will almost always have it
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if provider.Endpoint == "" && len(kubernetesPort) > 0 && len(kubernetesHost) > 0 {
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log.Debugf("Using environment provided kubernetes endpoint")
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provider.Endpoint = "https://" + kubernetesHost + ":" + kubernetesPort
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}
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if provider.Endpoint == "" {
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log.Debugf("Using default kubernetes api endpoint")
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provider.Endpoint = defaultKubeEndpoint
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}
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log.Debugf("Kubernetes endpoint: %s", provider.Endpoint)
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return k8s.NewClient(provider.Endpoint, caCert, token)
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}
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// Provide allows the provider to provide configurations to traefik
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// using the given configuration channel.
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func (provider *Kubernetes) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
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k8sClient, err := provider.createClient()
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if err != nil {
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return err
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}
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provider.Constraints = append(provider.Constraints, constraints...)
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pool.Go(func(stop chan bool) {
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operation := func() error {
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for {
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stopWatch := make(chan bool, 5)
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defer close(stopWatch)
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log.Debugf("Using label selector: '%s'", provider.LabelSelector)
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eventsChan, errEventsChan, err := k8sClient.WatchAll(provider.LabelSelector, stopWatch)
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if err != nil {
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log.Errorf("Error watching kubernetes events: %v", err)
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timer := time.NewTimer(1 * time.Second)
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select {
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case <-timer.C:
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return err
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case <-stop:
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return nil
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}
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}
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for {
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select {
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case <-stop:
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stopWatch <- true
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return nil
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case err, _ := <-errEventsChan:
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stopWatch <- true
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return err
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case event := <-eventsChan:
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log.Debugf("Received event from kubernetes %+v", event)
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templateObjects, err := provider.loadIngresses(k8sClient)
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if err != nil {
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return err
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}
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if reflect.DeepEqual(provider.lastConfiguration.Get(), templateObjects) {
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log.Debugf("Skipping event from kubernetes %+v", event)
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} else {
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provider.lastConfiguration.Set(templateObjects)
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configurationChan <- types.ConfigMessage{
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ProviderName: "kubernetes",
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Configuration: provider.loadConfig(*templateObjects),
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}
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}
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}
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}
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}
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}
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notify := func(err error, time time.Duration) {
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log.Errorf("Kubernetes connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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log.Errorf("Cannot connect to Kubernetes server %+v", err)
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}
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})
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templateObjects, err := provider.loadIngresses(k8sClient)
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if err != nil {
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return err
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}
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if reflect.DeepEqual(provider.lastConfiguration.Get(), templateObjects) {
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log.Debugf("Skipping configuration from kubernetes %+v", templateObjects)
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} else {
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provider.lastConfiguration.Set(templateObjects)
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configurationChan <- types.ConfigMessage{
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ProviderName: "kubernetes",
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Configuration: provider.loadConfig(*templateObjects),
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}
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}
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return nil
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}
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func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configuration, error) {
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ingresses, err := k8sClient.GetIngresses(provider.LabelSelector, func(ingress k8s.Ingress) bool {
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if len(provider.Namespaces) == 0 {
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return true
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}
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for _, n := range provider.Namespaces {
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if ingress.ObjectMeta.Namespace == n {
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return true
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}
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}
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return false
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})
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if err != nil {
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log.Errorf("Error retrieving ingresses: %+v", err)
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return nil, err
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}
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templateObjects := types.Configuration{
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map[string]*types.Backend{},
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map[string]*types.Frontend{},
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}
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PassHostHeader := provider.getPassHostHeader()
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for _, i := range ingresses {
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for _, r := range i.Spec.Rules {
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for _, pa := range r.HTTP.Paths {
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if _, exists := templateObjects.Backends[r.Host+pa.Path]; !exists {
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templateObjects.Backends[r.Host+pa.Path] = &types.Backend{
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Servers: make(map[string]types.Server),
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}
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}
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if _, exists := templateObjects.Frontends[r.Host+pa.Path]; !exists {
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templateObjects.Frontends[r.Host+pa.Path] = &types.Frontend{
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Backend: r.Host + pa.Path,
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PassHostHeader: PassHostHeader,
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Routes: make(map[string]types.Route),
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Priority: len(pa.Path),
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}
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}
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if len(r.Host) > 0 {
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if _, exists := templateObjects.Frontends[r.Host+pa.Path].Routes[r.Host]; !exists {
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templateObjects.Frontends[r.Host+pa.Path].Routes[r.Host] = types.Route{
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Rule: "Host:" + r.Host,
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}
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}
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}
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if len(pa.Path) > 0 {
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ruleType := i.Annotations["traefik.frontend.rule.type"]
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switch strings.ToLower(ruleType) {
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case "pathprefixstrip":
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ruleType = "PathPrefixStrip"
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case "pathstrip":
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ruleType = "PathStrip"
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case "path":
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ruleType = "Path"
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case "pathprefix":
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ruleType = "PathPrefix"
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case "":
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ruleType = "PathPrefix"
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default:
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log.Warnf("Unknown RuleType %s for %s/%s, falling back to PathPrefix", ruleType, i.ObjectMeta.Namespace, i.ObjectMeta.Name)
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ruleType = "PathPrefix"
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}
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templateObjects.Frontends[r.Host+pa.Path].Routes[pa.Path] = types.Route{
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Rule: ruleType + ":" + pa.Path,
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}
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}
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service, err := k8sClient.GetService(pa.Backend.ServiceName, i.ObjectMeta.Namespace)
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if err != nil {
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log.Warnf("Error retrieving services: %v", err)
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delete(templateObjects.Frontends, r.Host+pa.Path)
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log.Warnf("Error retrieving services %s", pa.Backend.ServiceName)
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continue
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}
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protocol := "http"
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for _, port := range service.Spec.Ports {
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if equalPorts(port, pa.Backend.ServicePort) {
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if port.Port == 443 {
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protocol = "https"
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}
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endpoints, err := k8sClient.GetEndpoints(service.ObjectMeta.Name, service.ObjectMeta.Namespace)
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if err != nil {
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log.Errorf("Error retrieving endpoints: %v", err)
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continue
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}
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if len(endpoints.Subsets) == 0 {
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log.Warnf("Endpoints not found for %s/%s, falling back to Service ClusterIP", service.ObjectMeta.Namespace, service.ObjectMeta.Name)
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templateObjects.Backends[r.Host+pa.Path].Servers[string(service.UID)] = types.Server{
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URL: protocol + "://" + service.Spec.ClusterIP + ":" + strconv.Itoa(port.Port),
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Weight: 1,
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}
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} else {
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for _, subset := range endpoints.Subsets {
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for _, address := range subset.Addresses {
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url := protocol + "://" + address.IP + ":" + strconv.Itoa(endpointPortNumber(port, subset.Ports))
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name := url
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if address.TargetRef != nil && address.TargetRef.Name != "" {
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name = address.TargetRef.Name
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}
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templateObjects.Backends[r.Host+pa.Path].Servers[name] = types.Server{
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URL: url,
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Weight: 1,
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}
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}
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}
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}
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break
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}
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}
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}
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}
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}
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return &templateObjects, nil
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}
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func endpointPortNumber(servicePort k8s.ServicePort, endpointPorts []k8s.EndpointPort) int {
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if len(endpointPorts) > 0 {
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//name is optional if there is only one port
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port := endpointPorts[0]
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for _, endpointPort := range endpointPorts {
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if servicePort.Name == endpointPort.Name {
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port = endpointPort
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}
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}
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return int(port.Port)
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}
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return servicePort.Port
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}
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func equalPorts(servicePort k8s.ServicePort, ingressPort k8s.IntOrString) bool {
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if servicePort.Port == ingressPort.IntValue() {
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return true
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}
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if servicePort.Name != "" && servicePort.Name == ingressPort.String() {
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return true
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}
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return false
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}
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func (provider *Kubernetes) getPassHostHeader() bool {
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if provider.DisablePassHostHeaders {
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return false
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}
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return true
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}
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func (provider *Kubernetes) loadConfig(templateObjects types.Configuration) *types.Configuration {
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var FuncMap = template.FuncMap{}
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configuration, err := provider.getConfiguration("templates/kubernetes.tmpl", FuncMap, templateObjects)
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if err != nil {
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log.Error(err)
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}
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return configuration
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}
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