traefik/pkg/provider/kubernetes/gateway/kubernetes.go
2021-04-29 17:18:04 +02:00

975 lines
32 KiB
Go

package gateway
import (
"context"
"crypto/sha256"
"errors"
"fmt"
"net"
"os"
"sort"
"strconv"
"strings"
"time"
"github.com/cenkalti/backoff/v4"
"github.com/hashicorp/go-multierror"
"github.com/mitchellh/hashstructure"
ptypes "github.com/traefik/paerser/types"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/job"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/provider"
"github.com/traefik/traefik/v2/pkg/safe"
"github.com/traefik/traefik/v2/pkg/tls"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"sigs.k8s.io/gateway-api/apis/v1alpha1"
)
const (
providerName = "kubernetesgateway"
traefikServiceKind = "TraefikService"
traefikServiceGroupName = "traefik.containo.us"
)
// Provider holds configurations of the provider.
type Provider struct {
Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty"`
Token string `description:"Kubernetes bearer token (not needed for in-cluster client)." json:"token,omitempty" toml:"token,omitempty" yaml:"token,omitempty"`
CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)." json:"certAuthFilePath,omitempty" toml:"certAuthFilePath,omitempty" yaml:"certAuthFilePath,omitempty"`
Namespaces []string `description:"Kubernetes namespaces." json:"namespaces,omitempty" toml:"namespaces,omitempty" yaml:"namespaces,omitempty" export:"true"`
LabelSelector string `description:"Kubernetes label selector to select specific GatewayClasses." json:"labelSelector,omitempty" toml:"labelSelector,omitempty" yaml:"labelSelector,omitempty" export:"true"`
ThrottleDuration ptypes.Duration `description:"Kubernetes refresh throttle duration" json:"throttleDuration,omitempty" toml:"throttleDuration,omitempty" yaml:"throttleDuration,omitempty" export:"true"`
EntryPoints map[string]Entrypoint `json:"-" toml:"-" yaml:"-" label:"-" file:"-"`
lastConfiguration safe.Safe
}
// Entrypoint defines the available entry points.
type Entrypoint struct {
Address string
HasHTTPTLSConf bool
}
func (p *Provider) newK8sClient(ctx context.Context) (*clientWrapper, error) {
// Label selector validation
_, err := labels.Parse(p.LabelSelector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %q", p.LabelSelector)
}
log.FromContext(ctx).Infof("label selector is: %q", p.LabelSelector)
withEndpoint := ""
if p.Endpoint != "" {
withEndpoint = fmt.Sprintf(" with endpoint %s", p.Endpoint)
}
var client *clientWrapper
switch {
case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "":
log.FromContext(ctx).Infof("Creating in-cluster Provider client%s", withEndpoint)
client, err = newInClusterClient(p.Endpoint)
case os.Getenv("KUBECONFIG") != "":
log.FromContext(ctx).Infof("Creating cluster-external Provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG"))
client, err = newExternalClusterClientFromFile(os.Getenv("KUBECONFIG"))
default:
log.FromContext(ctx).Infof("Creating cluster-external Provider client%s", withEndpoint)
client, err = newExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath)
}
if err != nil {
return nil, err
}
client.labelSelector = p.LabelSelector
return client, nil
}
// Init the provider.
func (p *Provider) Init() error {
return nil
}
// Provide allows the k8s provider to provide configurations to traefik
// using the given configuration channel.
func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
ctxLog := log.With(context.Background(), log.Str(log.ProviderName, providerName))
logger := log.FromContext(ctxLog)
k8sClient, err := p.newK8sClient(ctxLog)
if err != nil {
return err
}
pool.GoCtx(func(ctxPool context.Context) {
operation := func() error {
eventsChan, err := k8sClient.WatchAll(p.Namespaces, ctxPool.Done())
if err != nil {
logger.Errorf("Error watching kubernetes events: %v", err)
timer := time.NewTimer(1 * time.Second)
select {
case <-timer.C:
return err
case <-ctxPool.Done():
return nil
}
}
throttleDuration := time.Duration(p.ThrottleDuration)
throttledChan := throttleEvents(ctxLog, throttleDuration, pool, eventsChan)
if throttledChan != nil {
eventsChan = throttledChan
}
for {
select {
case <-ctxPool.Done():
return nil
case event := <-eventsChan:
// Note that event is the *first* event that came in during this throttling interval -- if we're hitting our throttle, we may have dropped events.
// This is fine, because we don't treat different event types differently.
// But if we do in the future, we'll need to track more information about the dropped events.
conf := p.loadConfigurationFromGateway(ctxLog, k8sClient)
confHash, err := hashstructure.Hash(conf, nil)
switch {
case err != nil:
logger.Error("Unable to hash the configuration")
case p.lastConfiguration.Get() == confHash:
logger.Debugf("Skipping Kubernetes event kind %T", event)
default:
p.lastConfiguration.Set(confHash)
configurationChan <- dynamic.Message{
ProviderName: providerName,
Configuration: conf,
}
}
// If we're throttling,
// we sleep here for the throttle duration to enforce that we don't refresh faster than our throttle.
// time.Sleep returns immediately if p.ThrottleDuration is 0 (no throttle).
time.Sleep(throttleDuration)
}
}
}
notify := func(err error, time time.Duration) {
logger.Errorf("Provider connection error: %v; retrying in %s", err, time)
}
err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), ctxPool), notify)
if err != nil {
logger.Errorf("Cannot connect to Provider: %v", err)
}
})
return nil
}
// TODO Handle errors and update resources statuses (gatewayClass, gateway).
func (p *Provider) loadConfigurationFromGateway(ctx context.Context, client Client) *dynamic.Configuration {
logger := log.FromContext(ctx)
gatewayClassNames := map[string]struct{}{}
gatewayClasses, err := client.GetGatewayClasses()
if err != nil {
logger.Errorf("Cannot find GatewayClasses: %v", err)
return &dynamic.Configuration{
UDP: &dynamic.UDPConfiguration{
Routers: map[string]*dynamic.UDPRouter{},
Services: map[string]*dynamic.UDPService{},
},
TCP: &dynamic.TCPConfiguration{
Routers: map[string]*dynamic.TCPRouter{},
Services: map[string]*dynamic.TCPService{},
},
HTTP: &dynamic.HTTPConfiguration{
Routers: map[string]*dynamic.Router{},
Middlewares: map[string]*dynamic.Middleware{},
Services: map[string]*dynamic.Service{},
},
TLS: &dynamic.TLSConfiguration{},
}
}
for _, gatewayClass := range gatewayClasses {
if gatewayClass.Spec.Controller == "traefik.io/gateway-controller" {
gatewayClassNames[gatewayClass.Name] = struct{}{}
err := client.UpdateGatewayClassStatus(gatewayClass, metav1.Condition{
Type: string(v1alpha1.GatewayClassConditionStatusAdmitted),
Status: metav1.ConditionTrue,
Reason: "Handled",
Message: "Handled by Traefik controller",
LastTransitionTime: metav1.Now(),
})
if err != nil {
logger.Errorf("Failed to update %s condition: %v", v1alpha1.GatewayClassConditionStatusAdmitted, err)
}
}
}
cfgs := map[string]*dynamic.Configuration{}
// TODO check if we can only use the default filtering mechanism
for _, gateway := range client.GetGateways() {
ctxLog := log.With(ctx, log.Str("gateway", gateway.Name), log.Str("namespace", gateway.Namespace))
logger := log.FromContext(ctxLog)
if _, ok := gatewayClassNames[gateway.Spec.GatewayClassName]; !ok {
continue
}
cfg, err := p.createGatewayConf(client, gateway)
if err != nil {
logger.Error(err)
continue
}
cfgs[gateway.Name+gateway.Namespace] = cfg
}
conf := provider.Merge(ctx, cfgs)
conf.TLS = &dynamic.TLSConfiguration{}
for _, cfg := range cfgs {
if conf.TLS == nil {
conf.TLS = &dynamic.TLSConfiguration{}
}
conf.TLS.Certificates = append(conf.TLS.Certificates, cfg.TLS.Certificates...)
for name, options := range cfg.TLS.Options {
if conf.TLS.Options == nil {
conf.TLS.Options = map[string]tls.Options{}
}
conf.TLS.Options[name] = options
}
for name, store := range cfg.TLS.Stores {
if conf.TLS.Stores == nil {
conf.TLS.Stores = map[string]tls.Store{}
}
conf.TLS.Stores[name] = store
}
}
return conf
}
func (p *Provider) createGatewayConf(client Client, gateway *v1alpha1.Gateway) (*dynamic.Configuration, error) {
conf := &dynamic.Configuration{
UDP: &dynamic.UDPConfiguration{
Routers: map[string]*dynamic.UDPRouter{},
Services: map[string]*dynamic.UDPService{},
},
TCP: &dynamic.TCPConfiguration{
Routers: map[string]*dynamic.TCPRouter{},
Services: map[string]*dynamic.TCPService{},
},
HTTP: &dynamic.HTTPConfiguration{
Routers: map[string]*dynamic.Router{},
Middlewares: map[string]*dynamic.Middleware{},
Services: map[string]*dynamic.Service{},
},
TLS: &dynamic.TLSConfiguration{},
}
tlsConfigs := make(map[string]*tls.CertAndStores)
// GatewayReasonListenersNotValid is used when one or more
// Listeners have an invalid or unsupported configuration
// and cannot be configured on the Gateway.
listenerStatuses := p.fillGatewayConf(client, gateway, conf, tlsConfigs)
gatewayStatus, errG := p.makeGatewayStatus(listenerStatuses)
err := client.UpdateGatewayStatus(gateway, gatewayStatus)
if err != nil {
return nil, fmt.Errorf("an error occurred while updating gateway status: %w", err)
}
if errG != nil {
return nil, fmt.Errorf("an error occurred while creating gateway status: %w", errG)
}
if len(tlsConfigs) > 0 {
conf.TLS.Certificates = append(conf.TLS.Certificates, getTLSConfig(tlsConfigs)...)
}
return conf, nil
}
func (p *Provider) fillGatewayConf(client Client, gateway *v1alpha1.Gateway, conf *dynamic.Configuration, tlsConfigs map[string]*tls.CertAndStores) []v1alpha1.ListenerStatus {
listenerStatuses := make([]v1alpha1.ListenerStatus, len(gateway.Spec.Listeners))
for i, listener := range gateway.Spec.Listeners {
listenerStatuses[i] = v1alpha1.ListenerStatus{
Port: listener.Port,
Conditions: []metav1.Condition{},
}
// Supported Protocol
if listener.Protocol != v1alpha1.HTTPProtocolType && listener.Protocol != v1alpha1.HTTPSProtocolType {
// update "Detached" status true with "UnsupportedProtocol" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionDetached),
Status: metav1.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonUnsupportedProtocol),
Message: fmt.Sprintf("Unsupported listener protocol %q", listener.Protocol),
})
continue
}
ep, err := p.entryPointName(listener.Port, listener.Protocol)
if err != nil {
// update "Detached" status with "PortUnavailable" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionDetached),
Status: metav1.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonPortUnavailable),
Message: fmt.Sprintf("Cannot find entryPoint for Gateway: %v", err),
})
continue
}
if listener.Protocol == v1alpha1.HTTPSProtocolType {
if listener.TLS == nil {
// update "Detached" status with "UnsupportedProtocol" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionDetached),
Status: metav1.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonUnsupportedProtocol),
Message: fmt.Sprintf("No TLS configuration for Gateway Listener port %d and protocol %q", listener.Port, listener.Protocol),
})
continue
}
if listener.TLS.CertificateRef.Kind != "Secret" || listener.TLS.CertificateRef.Group != "core" {
// update "ResolvedRefs" status true with "InvalidCertificateRef" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonInvalidCertificateRef),
Message: fmt.Sprintf("Unsupported TLS CertificateRef group/kind : %v/%v", listener.TLS.CertificateRef.Group, listener.TLS.CertificateRef.Kind),
})
continue
}
configKey := gateway.Namespace + "/" + listener.TLS.CertificateRef.Name
if _, tlsExists := tlsConfigs[configKey]; !tlsExists {
tlsConf, err := getTLS(client, listener.TLS.CertificateRef.Name, gateway.Namespace)
if err != nil {
// update "ResolvedRefs" status true with "InvalidCertificateRef" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonInvalidCertificateRef),
Message: fmt.Sprintf("Error while retrieving certificate: %v", err),
})
continue
}
tlsConfigs[configKey] = tlsConf
}
}
// Supported Route types
if listener.Routes.Kind != "HTTPRoute" {
// update "ResolvedRefs" status true with "InvalidRoutesRef" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonInvalidRoutesRef),
Message: fmt.Sprintf("Unsupported Route Kind %q", listener.Routes.Kind),
})
continue
}
// TODO: support RouteNamespaces
httpRoutes, err := client.GetHTTPRoutes(gateway.Namespace, labels.SelectorFromSet(listener.Routes.Selector.MatchLabels))
if err != nil {
// update "ResolvedRefs" status true with "InvalidRoutesRef" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonInvalidRoutesRef),
Message: fmt.Sprintf("Cannot fetch HTTPRoutes for namespace %q and matchLabels %v", gateway.Namespace, listener.Routes.Selector.MatchLabels),
})
continue
}
for _, httpRoute := range httpRoutes {
// Should never happen
if httpRoute == nil {
continue
}
hostRule, err := hostRule(httpRoute.Spec)
if err != nil {
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonDegradedRoutes),
Message: fmt.Sprintf("Skipping HTTPRoute %s: invalid hostname: %v", httpRoute.Name, err),
})
continue
}
for _, routeRule := range httpRoute.Spec.Rules {
rule, err := extractRule(routeRule, hostRule)
if err != nil {
// update "ResolvedRefs" status true with "DroppedRoutes" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonDegradedRoutes),
Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot generate rule: %v", httpRoute.Name, err),
})
continue
}
router := dynamic.Router{
Rule: rule,
EntryPoints: []string{ep},
}
if listener.TLS != nil {
// TODO support let's encrypt
router.TLS = &dynamic.RouterTLSConfig{}
}
// Adding the gateway name and the entryPoint name prevents overlapping of routers build from the same routes.
routerName := httpRoute.Name + "-" + gateway.Name + "-" + ep
routerKey, err := makeRouterKey(router.Rule, makeID(httpRoute.Namespace, routerName))
if err != nil {
// update "ResolvedRefs" status true with "DroppedRoutes" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonDegradedRoutes),
Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot make router's key with rule %s: %v", httpRoute.Name, router.Rule, err),
})
// TODO update the RouteStatus condition / deduplicate conditions on listener
continue
}
if routeRule.ForwardTo != nil {
// Traefik internal service can be used only if there is only one ForwardTo service reference.
if len(routeRule.ForwardTo) == 1 && isInternalService(routeRule.ForwardTo[0]) {
router.Service = routeRule.ForwardTo[0].BackendRef.Name
} else {
wrrService, subServices, err := loadServices(client, gateway.Namespace, routeRule.ForwardTo)
if err != nil {
// update "ResolvedRefs" status true with "DroppedRoutes" reason
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionResolvedRefs),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.ListenerReasonDegradedRoutes),
Message: fmt.Sprintf("Cannot load service from HTTPRoute %s/%s : %v", gateway.Namespace, httpRoute.Name, err),
})
// TODO update the RouteStatus condition / deduplicate conditions on listener
continue
}
for svcName, svc := range subServices {
conf.HTTP.Services[svcName] = svc
}
serviceName := provider.Normalize(routerKey + "-wrr")
conf.HTTP.Services[serviceName] = wrrService
router.Service = serviceName
}
}
if router.Service != "" {
routerKey = provider.Normalize(routerKey)
conf.HTTP.Routers[routerKey] = &router
}
}
}
}
return listenerStatuses
}
func (p *Provider) makeGatewayStatus(listenerStatuses []v1alpha1.ListenerStatus) (v1alpha1.GatewayStatus, error) {
// As Status.Addresses are not implemented yet, we initialize an empty array to follow the API expectations.
gatewayStatus := v1alpha1.GatewayStatus{
Addresses: []v1alpha1.GatewayAddress{},
}
var result error
for i, listener := range listenerStatuses {
if len(listener.Conditions) == 0 {
// GatewayConditionReady "Ready", GatewayConditionReason "ListenerReady"
listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{
Type: string(v1alpha1.ListenerConditionReady),
Status: metav1.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: "ListenerReady",
Message: "No error found",
})
continue
}
for _, condition := range listener.Conditions {
result = multierror.Append(result, errors.New(condition.Message))
}
}
if result != nil {
// GatewayConditionReady "Ready", GatewayConditionReason "ListenersNotValid"
gatewayStatus.Conditions = append(gatewayStatus.Conditions, metav1.Condition{
Type: string(v1alpha1.GatewayConditionReady),
Status: metav1.ConditionFalse,
LastTransitionTime: metav1.Now(),
Reason: string(v1alpha1.GatewayReasonListenersNotValid),
Message: "All Listeners must be valid",
})
return gatewayStatus, result
}
gatewayStatus.Listeners = listenerStatuses
gatewayStatus.Conditions = append(gatewayStatus.Conditions,
// update "Scheduled" status with "ResourcesAvailable" reason
metav1.Condition{
Type: string(v1alpha1.GatewayConditionScheduled),
Status: metav1.ConditionTrue,
Reason: "ResourcesAvailable",
Message: "Resources available",
LastTransitionTime: metav1.Now(),
},
// update "Ready" status with "ListenersValid" reason
metav1.Condition{
Type: string(v1alpha1.GatewayConditionReady),
Status: metav1.ConditionTrue,
Reason: "ListenersValid",
Message: "Listeners valid",
LastTransitionTime: metav1.Now(),
},
)
return gatewayStatus, nil
}
func hostRule(httpRouteSpec v1alpha1.HTTPRouteSpec) (string, error) {
var hostNames []string
var hostRegexNames []string
for _, hostname := range httpRouteSpec.Hostnames {
host := string(hostname)
// When unspecified, "", or *, all hostnames are matched.
// This field can be omitted for protocols that don't require hostname based matching.
// TODO Refactor this when building support for TLS options.
if host == "*" || host == "" {
return "", nil
}
wildcard := strings.Count(host, "*")
if wildcard == 0 {
hostNames = append(hostNames, host)
continue
}
// https://gateway-api.sigs.k8s.io/spec/#networking.x-k8s.io/v1alpha1.Hostname
if !strings.HasPrefix(host, "*.") || wildcard > 1 {
return "", fmt.Errorf("invalid rule: %q", host)
}
hostRegexNames = append(hostRegexNames, strings.Replace(host, "*.", "{subdomain:[a-zA-Z0-9-]+}.", 1))
}
var res string
if len(hostNames) > 0 {
res = "Host(`" + strings.Join(hostNames, "`, `") + "`)"
}
if len(hostRegexNames) == 0 {
return res, nil
}
hostRegexp := "HostRegexp(`" + strings.Join(hostRegexNames, "`, `") + "`)"
if len(res) > 0 {
return "(" + res + " || " + hostRegexp + ")", nil
}
return hostRegexp, nil
}
func extractRule(routeRule v1alpha1.HTTPRouteRule, hostRule string) (string, error) {
var rule string
var matchesRules []string
for _, match := range routeRule.Matches {
if len(match.Path.Type) == 0 && match.Headers == nil {
continue
}
var matchRules []string
// TODO handle other path types
if len(match.Path.Type) > 0 {
switch match.Path.Type {
case v1alpha1.PathMatchExact:
matchRules = append(matchRules, "Path(`"+match.Path.Value+"`)")
case v1alpha1.PathMatchPrefix:
matchRules = append(matchRules, "PathPrefix(`"+match.Path.Value+"`)")
default:
return "", fmt.Errorf("unsupported path match %s", match.Path.Type)
}
}
// TODO handle other headers types
if match.Headers != nil {
switch match.Headers.Type {
case v1alpha1.HeaderMatchExact:
var headerRules []string
for headerName, headerValue := range match.Headers.Values {
headerRules = append(headerRules, "Headers(`"+headerName+"`,`"+headerValue+"`)")
}
// to have a consistent order
sort.Strings(headerRules)
matchRules = append(matchRules, headerRules...)
default:
return "", fmt.Errorf("unsupported header match type %s", match.Headers.Type)
}
}
matchesRules = append(matchesRules, strings.Join(matchRules, " && "))
}
// If no matches are specified, the default is a prefix
// path match on "/", which has the effect of matching every
// HTTP request.
if len(routeRule.Matches) == 0 {
matchesRules = append(matchesRules, "PathPrefix(`/`)")
}
if hostRule != "" {
if len(matchesRules) == 0 {
return hostRule, nil
}
rule += hostRule + " && "
}
if len(matchesRules) == 1 {
return rule + matchesRules[0], nil
}
if len(rule) == 0 {
return strings.Join(matchesRules, " || "), nil
}
return rule + "(" + strings.Join(matchesRules, " || ") + ")", nil
}
func (p *Provider) entryPointName(port v1alpha1.PortNumber, protocol v1alpha1.ProtocolType) (string, error) {
portStr := strconv.FormatInt(int64(port), 10)
for name, entryPoint := range p.EntryPoints {
if strings.HasSuffix(entryPoint.Address, ":"+portStr) {
// if the protocol is HTTP the entryPoint must have no TLS conf
if protocol == v1alpha1.HTTPProtocolType && entryPoint.HasHTTPTLSConf {
continue
}
return name, nil
}
}
return "", fmt.Errorf("no matching entryPoint for port %d and protocol %q", port, protocol)
}
func makeRouterKey(rule, name string) (string, error) {
h := sha256.New()
if _, err := h.Write([]byte(rule)); err != nil {
return "", err
}
key := fmt.Sprintf("%s-%.10x", name, h.Sum(nil))
return key, nil
}
func makeID(namespace, name string) string {
if namespace == "" {
return name
}
return namespace + "-" + name
}
func getTLS(k8sClient Client, secretName, namespace string) (*tls.CertAndStores, error) {
secret, exists, err := k8sClient.GetSecret(namespace, secretName)
if err != nil {
return nil, fmt.Errorf("failed to fetch secret %s/%s: %w", namespace, secretName, err)
}
if !exists {
return nil, fmt.Errorf("secret %s/%s does not exist", namespace, secretName)
}
cert, key, err := getCertificateBlocks(secret, namespace, secretName)
if err != nil {
return nil, err
}
return &tls.CertAndStores{
Certificate: tls.Certificate{
CertFile: tls.FileOrContent(cert),
KeyFile: tls.FileOrContent(key),
},
}, nil
}
func getTLSConfig(tlsConfigs map[string]*tls.CertAndStores) []*tls.CertAndStores {
var secretNames []string
for secretName := range tlsConfigs {
secretNames = append(secretNames, secretName)
}
sort.Strings(secretNames)
var configs []*tls.CertAndStores
for _, secretName := range secretNames {
configs = append(configs, tlsConfigs[secretName])
}
return configs
}
func getCertificateBlocks(secret *corev1.Secret, namespace, secretName string) (string, string, error) {
var missingEntries []string
tlsCrtData, tlsCrtExists := secret.Data["tls.crt"]
if !tlsCrtExists {
missingEntries = append(missingEntries, "tls.crt")
}
tlsKeyData, tlsKeyExists := secret.Data["tls.key"]
if !tlsKeyExists {
missingEntries = append(missingEntries, "tls.key")
}
if len(missingEntries) > 0 {
return "", "", fmt.Errorf("secret %s/%s is missing the following TLS data entries: %s",
namespace, secretName, strings.Join(missingEntries, ", "))
}
cert := string(tlsCrtData)
if cert == "" {
missingEntries = append(missingEntries, "tls.crt")
}
key := string(tlsKeyData)
if key == "" {
missingEntries = append(missingEntries, "tls.key")
}
if len(missingEntries) > 0 {
return "", "", fmt.Errorf("secret %s/%s contains the following empty TLS data entries: %s",
namespace, secretName, strings.Join(missingEntries, ", "))
}
return cert, key, nil
}
// loadServices is generating a WRR service, even when there is only one target.
func loadServices(client Client, namespace string, targets []v1alpha1.HTTPRouteForwardTo) (*dynamic.Service, map[string]*dynamic.Service, error) {
services := map[string]*dynamic.Service{}
wrrSvc := &dynamic.Service{
Weighted: &dynamic.WeightedRoundRobin{
Services: []dynamic.WRRService{},
},
}
for _, forwardTo := range targets {
weight := int(forwardTo.Weight)
if forwardTo.ServiceName == nil && forwardTo.BackendRef != nil {
if !(forwardTo.BackendRef.Group == traefikServiceGroupName && forwardTo.BackendRef.Kind == traefikServiceKind) {
continue
}
if strings.HasSuffix(forwardTo.BackendRef.Name, "@internal") {
return nil, nil, fmt.Errorf("traefik internal service %s is not allowed in a WRR loadbalancer", forwardTo.BackendRef.Name)
}
wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.WRRService{Name: forwardTo.BackendRef.Name, Weight: &weight})
continue
}
if forwardTo.ServiceName == nil {
continue
}
svc := dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{
PassHostHeader: func(v bool) *bool { return &v }(true),
},
}
service, exists, err := client.GetService(namespace, *forwardTo.ServiceName)
if err != nil {
return nil, nil, err
}
if !exists {
return nil, nil, errors.New("service not found")
}
if len(service.Spec.Ports) > 1 && forwardTo.Port == nil {
// If the port is unspecified and the backend is a Service
// object consisting of multiple port definitions, the route
// must be dropped from the Gateway. The controller should
// raise the "ResolvedRefs" condition on the Gateway with the
// "DroppedRoutes" reason. The gateway status for this route
// should be updated with a condition that describes the error
// more specifically.
log.WithoutContext().Errorf("A multiple ports Kubernetes Service cannot be used if unspecified forwardTo.Port")
continue
}
var portName string
var portSpec corev1.ServicePort
var match bool
for _, p := range service.Spec.Ports {
if forwardTo.Port == nil || p.Port == int32(*forwardTo.Port) {
portName = p.Name
portSpec = p
match = true
break
}
}
if !match {
return nil, nil, errors.New("service port not found")
}
endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, *forwardTo.ServiceName)
if endpointsErr != nil {
return nil, nil, endpointsErr
}
if !endpointsExists {
return nil, nil, errors.New("endpoints not found")
}
if len(endpoints.Subsets) == 0 {
return nil, nil, errors.New("subset not found")
}
var port int32
var portStr string
for _, subset := range endpoints.Subsets {
for _, p := range subset.Ports {
if portName == p.Name {
port = p.Port
break
}
}
if port == 0 {
return nil, nil, errors.New("cannot define a port")
}
protocol := getProtocol(portSpec, portName)
portStr = strconv.FormatInt(int64(port), 10)
for _, addr := range subset.Addresses {
svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, dynamic.Server{
URL: fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(addr.IP, portStr)),
})
}
}
serviceName := provider.Normalize(makeID(service.Namespace, service.Name) + "-" + portStr)
services[serviceName] = &svc
wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.WRRService{Name: serviceName, Weight: &weight})
}
if len(wrrSvc.Weighted.Services) == 0 {
return nil, nil, errors.New("no service has been created")
}
return wrrSvc, services, nil
}
func getProtocol(portSpec corev1.ServicePort, portName string) string {
protocol := "http"
if portSpec.Port == 443 || strings.HasPrefix(portName, "https") {
protocol = "https"
}
return protocol
}
func throttleEvents(ctx context.Context, throttleDuration time.Duration, pool *safe.Pool, eventsChan <-chan interface{}) chan interface{} {
if throttleDuration == 0 {
return nil
}
// Create a buffered channel to hold the pending event (if we're delaying processing the event due to throttling)
eventsChanBuffered := make(chan interface{}, 1)
// Run a goroutine that reads events from eventChan and does a non-blocking write to pendingEvent.
// This guarantees that writing to eventChan will never block,
// and that pendingEvent will have something in it if there's been an event since we read from that channel.
pool.GoCtx(func(ctxPool context.Context) {
for {
select {
case <-ctxPool.Done():
return
case nextEvent := <-eventsChan:
select {
case eventsChanBuffered <- nextEvent:
default:
// We already have an event in eventsChanBuffered, so we'll do a refresh as soon as our throttle allows us to.
// It's fine to drop the event and keep whatever's in the buffer -- we don't do different things for different events
log.FromContext(ctx).Debugf("Dropping event kind %T due to throttling", nextEvent)
}
}
}
})
return eventsChanBuffered
}
func isInternalService(forwardTo v1alpha1.HTTPRouteForwardTo) bool {
return forwardTo.ServiceName == nil &&
forwardTo.BackendRef != nil &&
forwardTo.BackendRef.Kind == traefikServiceKind &&
forwardTo.BackendRef.Group == traefikServiceGroupName &&
strings.HasSuffix(forwardTo.BackendRef.Name, "@internal")
}