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conversion.go
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conversion.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ingress
import (
"fmt"
"path"
"strconv"
"strings"
multierror "github.com/hashicorp/go-multierror"
"k8s.io/api/extensions/v1beta1"
"k8s.io/apimachinery/pkg/util/intstr"
meshconfig "istio.io/api/mesh/v1alpha1"
networking "istio.io/api/networking/v1alpha3"
"istio.io/istio/pilot/pkg/model"
"istio.io/istio/pilot/pkg/serviceregistry/kube"
"istio.io/istio/pkg/log"
)
// EncodeIngressRuleName encodes an ingress rule name for a given ingress resource name,
// as well as the position of the rule and path specified within it, counting from 1.
// ruleNum == pathNum == 0 indicates the default backend specified for an ingress.
func EncodeIngressRuleName(ingressName string, ruleNum, pathNum int) string {
return fmt.Sprintf("%s-%d-%d", ingressName, ruleNum, pathNum)
}
// decodeIngressRuleName decodes an ingress rule name previously encoded with EncodeIngressRuleName.
func decodeIngressRuleName(name string) (ingressName string, ruleNum, pathNum int, err error) {
parts := strings.Split(name, "-")
if len(parts) < 3 {
err = fmt.Errorf("could not decode string into ingress rule name: %s", name)
return
}
ingressName = strings.Join(parts[0:len(parts)-2], "-")
ruleNum, ruleErr := strconv.Atoi(parts[len(parts)-2])
pathNum, pathErr := strconv.Atoi(parts[len(parts)-1])
if pathErr != nil || ruleErr != nil {
err = multierror.Append(
fmt.Errorf("could not decode string into ingress rule name: %s", name),
pathErr, ruleErr)
return
}
return
}
// ConvertIngressV1alpha3 converts from ingress spec to Istio Gateway
func ConvertIngressV1alpha3(ingress v1beta1.Ingress, domainSuffix string) model.Config {
gateway := &networking.Gateway{
Selector: model.IstioIngressWorkloadLabels,
}
// FIXME this is a temporary hack until all test templates are updated
//for _, tls := range ingress.Spec.TLS {
// TODO: add secretName (converted to sdsName)
if len(ingress.Spec.TLS) > 0 {
tls := ingress.Spec.TLS[0] // FIXME
// TODO validation when multiple wildcard tls secrets are given
if len(tls.Hosts) == 0 {
tls.Hosts = []string{"*"}
}
gateway.Servers = append(gateway.Servers, &networking.Server{
Port: &networking.Port{
Number: 443,
Protocol: string(model.ProtocolHTTPS),
Name: fmt.Sprintf("https-443-ingress-%s-%s", ingress.Name, ingress.Namespace),
},
Hosts: tls.Hosts,
// While we accept multiple certs, we expect them to be mounted in
// /etc/istio/ingress-certs/tls.crt|tls.key|root-cert.pem
Tls: &networking.Server_TLSOptions{
HttpsRedirect: false,
Mode: networking.Server_TLSOptions_SIMPLE,
// TODO this is no longer valid for the new v2 stuff
PrivateKey: path.Join(model.IngressCertsPath, model.IngressKeyFilename),
ServerCertificate: path.Join(model.IngressCertsPath, model.IngressCertFilename),
// TODO: make sure this is mounted
CaCertificates: path.Join(model.IngressCertsPath, model.RootCertFilename),
},
})
}
gateway.Servers = append(gateway.Servers, &networking.Server{
Port: &networking.Port{
Number: 80,
Protocol: string(model.ProtocolHTTP),
Name: fmt.Sprintf("http-80-ingress-%s-%s", ingress.Name, ingress.Namespace),
},
Hosts: []string{"*"},
})
gatewayConfig := model.Config{
ConfigMeta: model.ConfigMeta{
Type: model.Gateway.Type,
Group: model.Gateway.Group,
Version: model.Gateway.Version,
Name: ingress.Name + "-" + model.IstioIngressGatewayName,
Namespace: ingressNamespace,
Domain: domainSuffix,
},
Spec: gateway,
}
return gatewayConfig
}
// ConvertIngressVirtualService converts from ingress spec to Istio VirtualServices
func ConvertIngressVirtualService(ingress v1beta1.Ingress, domainSuffix string, ingressByHost map[string]*model.Config) {
// Ingress allows a single host - if missing '*' is assumed
// We need to merge all rules with a particular host across
// all ingresses, and return a separate VirtualService for each
// host.
if ingressNamespace == "" {
ingressNamespace = model.IstioIngressNamespace
}
for _, rule := range ingress.Spec.Rules {
if rule.HTTP == nil {
log.Infof("invalid ingress rule %s:%s for host %q, no paths defined", ingress.Namespace, ingress.Name, rule.Host)
continue
}
host := rule.Host
namePrefix := strings.Replace(host, ".", "-", -1)
if host == "" {
host = "*"
}
virtualService := &networking.VirtualService{
Hosts: []string{},
// Note the name of the gateway is fixed - this is the Gateway that needs to be created by user (via helm
// or manually) with TLS secrets and explicit namespace (for security).
Gateways: []string{ingressNamespace + "/" + model.IstioIngressGatewayName},
}
virtualService.Hosts = []string{host}
httpRoutes := []*networking.HTTPRoute{}
for _, path := range rule.HTTP.Paths {
httpMatch := &networking.HTTPMatchRequest{
Uri: createStringMatch(path.Path),
}
httpRoute := ingressBackendToHTTPRoute(&path.Backend, ingress.Namespace, domainSuffix)
if httpRoute == nil {
log.Infof("invalid ingress rule %s:%s for host %q, no backend defined for path", ingress.Namespace, ingress.Name, rule.Host)
continue
}
httpRoute.Match = []*networking.HTTPMatchRequest{httpMatch}
httpRoutes = append(httpRoutes, httpRoute)
}
virtualService.Http = httpRoutes
virtualServiceConfig := model.Config{
ConfigMeta: model.ConfigMeta{
Type: model.VirtualService.Type,
Group: model.VirtualService.Group,
Version: model.VirtualService.Version,
Name: namePrefix + "-" + ingress.Name + "-" + model.IstioIngressGatewayName,
Namespace: ingress.Namespace,
Domain: domainSuffix,
},
Spec: virtualService,
}
old, f := ingressByHost[host]
if f {
vs := old.Spec.(*networking.VirtualService)
vs.Http = append(vs.Http, httpRoutes...)
} else {
ingressByHost[host] = &virtualServiceConfig
}
}
// Matches * and "/". Currently not supported - would conflict
// with any other explicit VirtualService.
if ingress.Spec.Backend != nil {
log.Infof("Ignore default wildcard ingress, use VirtualService %s:%s",
ingress.Namespace, ingress.Name)
}
}
func ingressBackendToHTTPRoute(backend *v1beta1.IngressBackend, namespace string, domainSuffix string) *networking.HTTPRoute {
if backend == nil {
return nil
}
port := &networking.PortSelector{
Port: nil,
}
if backend.ServicePort.Type == intstr.Int {
port.Port = &networking.PortSelector_Number{
Number: uint32(backend.ServicePort.IntVal),
}
} else {
// Port names are not allowed in destination rules.
return nil
}
return &networking.HTTPRoute{
Route: []*networking.HTTPRouteDestination{
{
Destination: &networking.Destination{
Host: fmt.Sprintf("%s.%s.svc.%s", backend.ServiceName, namespace, domainSuffix),
Port: port,
},
Weight: 100,
},
},
}
}
// shouldProcessIngress determines whether the given ingress resource should be processed
// by the controller, based on its ingress class annotation.
// See https://github.com/kubernetes/ingress/blob/master/examples/PREREQUISITES.md#ingress-class
func shouldProcessIngress(mesh *meshconfig.MeshConfig, ingress *v1beta1.Ingress) bool {
class, exists := "", false
if ingress.Annotations != nil {
class, exists = ingress.Annotations[kube.IngressClassAnnotation]
}
switch mesh.IngressControllerMode {
case meshconfig.MeshConfig_OFF:
return false
case meshconfig.MeshConfig_STRICT:
return exists && class == mesh.IngressClass
case meshconfig.MeshConfig_DEFAULT:
return !exists || class == mesh.IngressClass
default:
log.Warnf("invalid ingress synchronization mode: %v", mesh.IngressControllerMode)
return false
}
}
func createStringMatch(s string) *networking.StringMatch {
if s == "" {
return nil
}
// Note that this implementation only converts prefix and exact matches, not regexps.
// Replace e.g. "foo.*" with prefix match
if strings.HasSuffix(s, ".*") {
return &networking.StringMatch{
MatchType: &networking.StringMatch_Prefix{Prefix: strings.TrimSuffix(s, ".*")},
}
}
if strings.HasSuffix(s, "/*") {
return &networking.StringMatch{
MatchType: &networking.StringMatch_Prefix{Prefix: strings.TrimSuffix(s, "/*")},
}
}
// Replace e.g. "foo" with a exact match
return &networking.StringMatch{
MatchType: &networking.StringMatch_Exact{Exact: s},
}
}