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istio.go
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istio.go
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/*
Copyright 2018 The Knative 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
https://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 config
import (
"fmt"
"sort"
"strconv"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/validation"
"knative.dev/pkg/system"
"knative.dev/serving/pkg/network"
)
const (
// IstioConfigName is the name of the configmap containing all
// customizations for istio related features.
IstioConfigName = "config-istio"
// GatewayKeyPrefix is the prefix of all keys to configure Istio gateways for public ClusterIngresses.
GatewayKeyPrefix = "gateway."
// LocalGatewayKeyPrefix is the prefix of all keys to configure Istio gateways for public & private ClusterIngresses.
LocalGatewayKeyPrefix = "local-gateway."
// ReconcileExternalGatewayKey the is the name of the configuration entry that specifies
// reconciling external Istio Gateways or not.
ReconcileExternalGatewayKey = "reconcileExternalGateway"
)
func defaultGateways() []Gateway {
return []Gateway{{
Namespace: system.Namespace(),
Name: "knative-ingress-gateway",
ServiceURL: fmt.Sprintf("istio-ingressgateway.istio-system.svc.%s",
network.GetClusterDomainName()),
}}
}
func defaultLocalGateways() []Gateway {
return []Gateway{{
Namespace: system.Namespace(),
Name: "cluster-local-gateway",
ServiceURL: fmt.Sprintf("cluster-local-gateway.istio-system.svc.%s",
network.GetClusterDomainName()),
}}
}
var defaultReconcileGateway = false
// Gateway specifies the name of the Gateway and the K8s Service backing it.
type Gateway struct {
Namespace string
Name string
ServiceURL string
}
// QualifiedName returns gateway name in '{namespace}/{name}' format.
func (g Gateway) QualifiedName() string {
return g.Namespace + "/" + g.Name
}
// Istio contains istio related configuration defined in the
// istio config map.
type Istio struct {
// IngressGateway specifies the gateway urls for public ClusterIngress.
IngressGateways []Gateway
// LocalGateway specifies the gateway urls for public & private ClusterIngress.
LocalGateways []Gateway
// ReconcileExternalGateway specifies if external Istio Gateways will be reconciled or not.
ReconcileExternalGateway bool
}
func parseGateways(configMap *corev1.ConfigMap, prefix string) ([]Gateway, error) {
urls := map[string]string{}
gatewayNames := []string{}
for k, v := range configMap.Data {
if !strings.HasPrefix(k, prefix) {
continue
}
gatewayName, serviceURL := k[len(prefix):], v
if errs := validation.IsDNS1123Subdomain(serviceURL); len(errs) > 0 {
return nil, fmt.Errorf("invalid gateway format: %v", errs)
}
gatewayNames = append(gatewayNames, gatewayName)
urls[gatewayName] = serviceURL
}
sort.Strings(gatewayNames)
gateways := make([]Gateway, len(gatewayNames))
for i, gatewayName := range gatewayNames {
gateways[i] = Gateway{
Namespace: system.Namespace(),
Name: gatewayName,
ServiceURL: urls[gatewayName],
}
}
return gateways, nil
}
// NewIstioFromConfigMap creates an Istio config from the supplied ConfigMap
func NewIstioFromConfigMap(configMap *corev1.ConfigMap) (*Istio, error) {
gateways, err := parseGateways(configMap, GatewayKeyPrefix)
if err != nil {
return nil, err
}
if len(gateways) == 0 {
gateways = defaultGateways()
}
localGateways, err := parseGateways(configMap, LocalGatewayKeyPrefix)
if len(localGateways) == 0 {
localGateways = defaultLocalGateways()
}
localGateways = removeMeshGateway(localGateways)
if err != nil {
return nil, err
}
reconcileGateway := defaultReconcileGateway
if reconcileGatewayStr := configMap.Data[ReconcileExternalGatewayKey]; len(reconcileGatewayStr) != 0 {
if reconcileGateway, err = strconv.ParseBool(reconcileGatewayStr); err != nil {
return nil, err
}
}
return &Istio{
IngressGateways: gateways,
LocalGateways: localGateways,
ReconcileExternalGateway: reconcileGateway,
}, nil
}
func removeMeshGateway(gateways []Gateway) []Gateway {
gws := []Gateway{}
for _, g := range gateways {
if g.Name != "mesh" {
gws = append(gws, g)
}
}
return gws
}