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ingressv1.go
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ingressv1.go
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package kubernetes
import (
"errors"
"fmt"
"regexp"
"strings"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/dataclients/kubernetes/definitions"
"github.com/zalando/skipper/eskip"
"github.com/zalando/skipper/secrets/certregistry"
)
type weightedIngressBackend struct {
name string
weight float64
}
var _ definitions.WeightedBackend = &weightedIngressBackend{}
func (b *weightedIngressBackend) GetName() string { return b.name }
func (b *weightedIngressBackend) GetWeight() float64 { return b.weight }
func setPathOld(m PathMode, r *eskip.Route, p string) {
switch m {
case PathPrefix:
r.Predicates = append(r.Predicates, &eskip.Predicate{
Name: "PathSubtree",
Args: []interface{}{p},
})
case PathRegexp:
r.PathRegexps = []string{p}
default:
if p == "/" {
r.PathRegexps = []string{"^/"}
} else {
r.PathRegexps = []string{"^(" + p + ")"}
}
}
}
func setPathV1(m PathMode, r *eskip.Route, pathType, path string) {
if path == "" {
return
}
// see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.22/#httpingresspath-v1-networking-k8s-io
switch pathType {
case "Exact":
r.Predicates = append(r.Predicates, &eskip.Predicate{
Name: "Path",
Args: []interface{}{path},
})
case "Prefix":
r.Predicates = append(r.Predicates, &eskip.Predicate{
Name: "PathSubtree",
Args: []interface{}{path},
})
default:
setPathOld(m, r, path)
}
}
func convertPathRuleV1(
ic *ingressContext,
host string,
prule *definitions.PathRuleV1,
traffic backendTraffic,
allowedExternalNames []*regexp.Regexp,
forceKubernetesService bool,
defaultLoadBalancerAlgorithm string,
) (*eskip.Route, error) {
state := ic.state
metadata := ic.ingressV1.Metadata
pathMode := ic.pathMode
ns := metadata.Namespace
name := metadata.Name
if prule.Backend == nil {
return nil, fmt.Errorf("invalid path rule, missing backend in: %s/%s/%s", ns, name, host)
}
var (
eps []string
err error
svc *service
)
var hostRegexp []string
if host != "" {
hostRegexp = []string{createHostRx(host)}
}
svcPort := prule.Backend.Service.Port
svcName := prule.Backend.Service.Name
svc, err = state.getService(ns, svcName)
if err != nil {
ic.logger.Errorf("Failed to get service %s, %s", svcName, svcPort)
return nil, err
}
servicePort, err := svc.getServicePortV1(svcPort)
if err != nil {
// service definition is wrong or no pods
err = nil
if len(eps) > 0 {
// should never happen
ic.logger.Errorf("Failed to find target port for service %s, but %d endpoints exist", svcName, len(eps))
}
} else if svc.Spec.Type == "ExternalName" {
return externalNameRoute(ns, name, host, hostRegexp, svc, servicePort, allowedExternalNames)
} else if forceKubernetesService {
eps = []string{serviceNameBackend(svcName, ns, servicePort)}
} else {
protocol := "http"
if p, ok := metadata.Annotations[skipperBackendProtocolAnnotationKey]; ok {
protocol = p
}
eps = state.GetEndpointsByService(ns, svcName, protocol, servicePort)
}
if len(eps) == 0 {
ic.logger.Tracef("Target endpoints not found, shuntroute for %s:%s", svcName, svcPort)
r := &eskip.Route{
Id: routeID(ns, name, host, prule.Path, svcName),
HostRegexps: hostRegexp,
}
setPathV1(pathMode, r, prule.PathType, prule.Path)
traffic.apply(r)
shuntRoute(r)
return r, nil
}
ic.logger.Tracef("Found %d endpoints for %s:%s", len(eps), svcName, svcPort)
if len(eps) == 1 {
r := &eskip.Route{
Id: routeID(ns, name, host, prule.Path, svcName),
Backend: eps[0],
BackendType: eskip.NetworkBackend,
HostRegexps: hostRegexp,
}
setPathV1(pathMode, r, prule.PathType, prule.Path)
traffic.apply(r)
return r, nil
}
r := &eskip.Route{
Id: routeID(ns, name, host, prule.Path, svcName),
BackendType: eskip.LBBackend,
LBEndpoints: eps,
LBAlgorithm: getLoadBalancerAlgorithm(metadata, defaultLoadBalancerAlgorithm),
HostRegexps: hostRegexp,
}
setPathV1(pathMode, r, prule.PathType, prule.Path)
traffic.apply(r)
return r, nil
}
func (ing *ingress) addEndpointsRuleV1(ic *ingressContext, host string, prule *definitions.PathRuleV1, traffic backendTraffic) error {
meta := ic.ingressV1.Metadata
endpointsRoute, err := convertPathRuleV1(
ic,
host,
prule,
traffic,
ing.allowedExternalNames,
ing.forceKubernetesService,
ing.defaultLoadBalancerAlgorithm,
)
if err != nil {
// if the service is not found the route should be removed
if err == errServiceNotFound || err == errResourceNotFound {
return nil
}
// TODO: this error checking should not really be used, and the error handling of the ingress
// problems should be refactored such that a single ingress's error doesn't block the
// processing of the independent ingresses.
if errors.Is(err, errNotAllowedExternalName) {
ic.logger.Infof("Not allowed external name: %v", err)
return nil
}
// Ingress status field does not support errors
return fmt.Errorf("error while getting service: %w", err)
}
if endpointsRoute.BackendType != eskip.ShuntBackend {
// safe prepend, see: https://play.golang.org/p/zg5aGKJpRyK
filters := make([]*eskip.Filter, len(endpointsRoute.Filters)+len(ic.annotationFilters))
copy(filters, ic.annotationFilters)
copy(filters[len(ic.annotationFilters):], endpointsRoute.Filters)
endpointsRoute.Filters = filters
}
// add pre-configured default filters
df, err := ic.defaultFilters.getNamed(meta.Namespace, prule.Backend.Service.Name)
if err != nil {
ic.logger.Errorf("Failed to retrieve default filters: %v", err)
} else {
// it's safe to prepend, because type defaultFilters copies the slice during get()
endpointsRoute.Filters = append(df, endpointsRoute.Filters...)
}
err = applyAnnotationPredicates(ic.pathMode, endpointsRoute, ic.annotationPredicate)
if err != nil {
ic.logger.Errorf("Failed to apply annotation predicates: %v", err)
}
ic.addHostRoute(host, endpointsRoute)
redirect := ic.redirect
ewRangeMatch := false
for _, s := range ing.eastWestRangeDomains {
if strings.HasSuffix(host, s) {
ewRangeMatch = true
break
}
}
if !(ewRangeMatch || strings.HasSuffix(host, ing.kubernetesEastWestDomain) && ing.kubernetesEastWestDomain != "") {
switch {
case redirect.ignore:
// no redirect
case redirect.enable:
ic.addHostRoute(host, createIngressEnableHTTPSRedirect(endpointsRoute, redirect.code))
redirect.setHost(host)
case redirect.disable:
ic.addHostRoute(host, createIngressDisableHTTPSRedirect(endpointsRoute))
redirect.setHostDisabled(host)
case redirect.defaultEnabled:
ic.addHostRoute(host, createIngressEnableHTTPSRedirect(endpointsRoute, redirect.code))
redirect.setHost(host)
}
}
if ing.kubernetesEnableEastWest {
ewRoute := createEastWestRouteIng(ing.kubernetesEastWestDomain, meta.Name, meta.Namespace, endpointsRoute)
ewHost := fmt.Sprintf("%s.%s.%s", meta.Name, meta.Namespace, ing.kubernetesEastWestDomain)
ic.addHostRoute(ewHost, ewRoute)
}
return nil
}
// computeBackendWeightsV1 computes backend traffic weights for the rule backends grouped by path rule.
func computeBackendWeightsV1(calculateTraffic func([]*weightedIngressBackend) map[string]backendTraffic, backendWeights map[string]float64, rule *definitions.RuleV1) map[*definitions.PathRuleV1]backendTraffic {
backendsPerPath := make(map[string][]*weightedIngressBackend)
for _, prule := range rule.Http.Paths {
b := &weightedIngressBackend{
name: prule.Backend.Service.Name,
weight: backendWeights[prule.Backend.Service.Name],
}
backendsPerPath[prule.Path] = append(backendsPerPath[prule.Path], b)
}
trafficPerPath := make(map[string]map[string]backendTraffic, len(backendsPerPath))
for path, b := range backendsPerPath {
trafficPerPath[path] = calculateTraffic(b)
}
trafficPerPathRule := make(map[*definitions.PathRuleV1]backendTraffic)
for _, prule := range rule.Http.Paths {
trafficPerPathRule[prule] = trafficPerPath[prule.Path][prule.Backend.Service.Name]
}
return trafficPerPathRule
}
// TODO: default filters not applied to 'extra' routes from the custom route annotations. Is it on purpose?
// https://github.com/zalando/skipper/issues/1287
func (ing *ingress) addSpecRuleV1(ic *ingressContext, ru *definitions.RuleV1) error {
if ru.Http == nil {
ic.logger.Infof("Skipping rule without http definition")
return nil
}
trafficPerPathRule := computeBackendWeightsV1(ic.calculateTraffic, ic.backendWeights, ru)
for _, prule := range ru.Http.Paths {
addExtraRoutes(ic, ru.Host, prule.Path, prule.PathType, ing.kubernetesEastWestDomain, ing.kubernetesEnableEastWest)
if trafficPerPathRule[prule].allowed() {
err := ing.addEndpointsRuleV1(ic, ru.Host, prule, trafficPerPathRule[prule])
if err != nil {
return err
}
}
}
return nil
}
// addSpecIngressTLSV1 is used to add TLS Certificates from Ingress resources. Certificates will be added
// only if the Ingress rule host matches a host in TLS config
func (ing *ingress) addSpecIngressTLSV1(ic *ingressContext, ingtls *definitions.TLSV1) {
ingressHosts := definitions.GetHostsFromIngressRulesV1(ic.ingressV1)
// Hosts in the tls section need to explicitly match the host in the rules section.
hostlist := compareStringList(ingtls.Hosts, ingressHosts)
if len(hostlist) == 0 {
ic.logger.Errorf("No matching tls hosts found - tls hosts: %s, ingress hosts: %s", ingtls.Hosts, ingressHosts)
return
} else if len(hostlist) != len(ingtls.Hosts) {
ic.logger.Infof("Hosts in TLS and Ingress don't match: tls hosts: %s, ingress hosts: %s", ingtls.Hosts, definitions.GetHostsFromIngressRulesV1(ic.ingressV1))
}
// Skip adding certs to registry since no certs defined
if ingtls.SecretName == "" {
ic.logger.Debugf("No tls secret defined for hosts - %s", ingtls.Hosts)
return
}
// Secrets should always reside in same namespace as the Ingress
secretID := definitions.ResourceID{Name: ingtls.SecretName, Namespace: ic.ingressV1.Metadata.Namespace}
secret, ok := ic.state.secrets[secretID]
if !ok {
ic.logger.Errorf("Failed to find secret %s in namespace %s", secretID.Name, secretID.Namespace)
return
}
addTLSCertToRegistry(ic.certificateRegistry, ic.logger, hostlist, secret)
}
// converts the default backend if any
func (ing *ingress) convertDefaultBackendV1(
ic *ingressContext,
forceKubernetesService bool,
) (*eskip.Route, bool, error) {
state := ic.state
i := ic.ingressV1
// the usage of the default backend depends on what we want
// we can generate a hostname out of it based on shared rules
// and instructions in annotations, if there are no rules defined
// this is a flaw in the ingress API design, because it is not on the hosts' level, but the spec
// tells to match if no rule matches. This means that there is no matching rule on this ingress
// and if there are multiple ingress items, then there is a race between them.
if i.Spec.DefaultBackend == nil {
return nil, false, nil
}
var (
eps []string
err error
ns = i.Metadata.Namespace
name = i.Metadata.Name
svcName = i.Spec.DefaultBackend.Service.Name
svcPort = i.Spec.DefaultBackend.Service.Port
)
svc, err := state.getService(ns, svcName)
if err != nil {
ic.logger.Errorf("Failed to get service %s, %s", svcName, svcPort)
return nil, false, err
}
servicePort, err := svc.getServicePortV1(svcPort)
if err != nil {
ic.logger.Errorf("Failed to find target port %v, %s, for service %s add shuntroute: %v", svc.Spec.Ports, svcPort, svcName, err)
err = nil
} else if svc.Spec.Type == "ExternalName" {
r, err := externalNameRoute(ns, name, "default", nil, svc, servicePort, ing.allowedExternalNames)
return r, err == nil, err
} else if forceKubernetesService {
eps = []string{serviceNameBackend(svcName, ns, servicePort)}
} else {
ic.logger.Debugf("Found target port %v, for service %s", servicePort.TargetPort, svcName)
protocol := "http"
if p, ok := i.Metadata.Annotations[skipperBackendProtocolAnnotationKey]; ok {
protocol = p
}
eps = state.GetEndpointsByService(
ns,
svcName,
protocol,
servicePort,
)
ic.logger.Debugf("Found %d endpoints for %s: %v", len(eps), svcName, err)
}
if len(eps) == 0 {
ic.logger.Tracef("Target endpoints not found, shuntroute for %s:%s", svcName, svcPort)
r := &eskip.Route{
Id: routeID(ns, name, "", "", ""),
}
shuntRoute(r)
return r, true, nil
} else if len(eps) == 1 {
return &eskip.Route{
Id: routeID(ns, name, "", "", ""),
Backend: eps[0],
BackendType: eskip.NetworkBackend,
}, true, nil
}
return &eskip.Route{
Id: routeID(ns, name, "", "", ""),
BackendType: eskip.LBBackend,
LBEndpoints: eps,
LBAlgorithm: getLoadBalancerAlgorithm(i.Metadata, ing.defaultLoadBalancerAlgorithm),
}, true, nil
}
func serviceNameBackend(svcName, svcNamespace string, servicePort *servicePort) string {
scheme := "https"
if n, _ := servicePort.TargetPort.Number(); n != 443 {
scheme = "http"
}
return fmt.Sprintf("%s://%s.%s.svc.cluster.local:%s", scheme, svcName, svcNamespace, servicePort.TargetPort)
}
func (ing *ingress) ingressV1Route(
i *definitions.IngressV1Item,
redirect *redirectInfo,
state *clusterState,
hostRoutes map[string][]*eskip.Route,
df defaultFilters,
r *certregistry.CertRegistry,
loggingEnabled bool,
) (*eskip.Route, error) {
if i.Metadata == nil || i.Metadata.Namespace == "" || i.Metadata.Name == "" || i.Spec == nil {
log.Error("invalid ingress item: missing Metadata or Spec")
return nil, nil
}
logger := newLogger("Ingress", i.Metadata.Namespace, i.Metadata.Name, loggingEnabled)
redirect.initCurrent(i.Metadata)
ic := &ingressContext{
state: state,
ingressV1: i,
logger: logger,
annotationFilters: annotationFilter(i.Metadata, logger),
annotationPredicate: annotationPredicate(i.Metadata),
extraRoutes: extraRoutes(i.Metadata),
backendWeights: backendWeights(i.Metadata, logger),
pathMode: pathMode(i.Metadata, ing.pathMode, logger),
redirect: redirect,
hostRoutes: hostRoutes,
defaultFilters: df,
certificateRegistry: r,
calculateTraffic: getBackendTrafficCalculator[*weightedIngressBackend](ing.backendTrafficAlgorithm),
}
var route *eskip.Route
if r, ok, err := ing.convertDefaultBackendV1(ic, ing.forceKubernetesService); ok {
route = r
} else if err != nil {
ic.logger.Errorf("Failed to convert default backend: %v", err)
}
for _, rule := range i.Spec.Rules {
err := ing.addSpecRuleV1(ic, rule)
if err != nil {
return nil, err
}
}
if ic.certificateRegistry != nil {
for _, ingtls := range i.Spec.IngressTLS {
ing.addSpecIngressTLSV1(ic, ingtls)
}
}
return route, nil
}