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translate_knative.go
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translate_knative.go
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package parser
import (
"errors"
"fmt"
"sort"
"github.com/kong/go-kong/kong"
knative "knative.dev/networking/pkg/apis/networking/v1alpha1"
"github.com/kong/kubernetes-ingress-controller/v2/internal/annotations"
"github.com/kong/kubernetes-ingress-controller/v2/internal/dataplane/kongstate"
"github.com/kong/kubernetes-ingress-controller/v2/internal/dataplane/parser/translators"
"github.com/kong/kubernetes-ingress-controller/v2/internal/store"
"github.com/kong/kubernetes-ingress-controller/v2/internal/util"
)
func (p *Parser) ingressRulesFromKnativeIngress() ingressRules {
result := newIngressRules()
// IngressClass is not actually part of the Knative spec, and we are getting networking.k8s.io IngressClasses here,
// not a resource specific to Knative. However, the reason we're using it (enabling the 2.x regex heuristic) is
// Kong-specific, so in absence of a proper Knative IngressClass to attach our IngressClassParams to, we may as
// well use the stock Kubernetes resource.
icp, err := getIngressClassParametersOrDefault(p.storer)
if err != nil {
if !errors.As(err, &store.ErrNotFound{}) {
// anything else is unexpected
p.logger.Errorf("could not find IngressClassParameters, using defaults: %s", err)
}
}
ingressList, err := p.storer.ListKnativeIngresses()
if err != nil {
p.logger.WithError(err).Error("failed to list Knative Ingresses")
return result
}
sort.SliceStable(ingressList, func(i, j int) bool {
return ingressList[i].CreationTimestamp.Before(
&ingressList[j].CreationTimestamp)
})
services := map[string]kongstate.Service{}
secretToSNIs := newSecretNameToSNIs()
for _, ingress := range ingressList {
if p.featureFlags.ExpressionRoutes {
p.registerResourceFailureNotSupportedForExpressionRoutes(ingress)
continue
}
regexPrefix := translators.ControllerPathRegexPrefix
if prefix, ok := ingress.ObjectMeta.Annotations[annotations.AnnotationPrefix+annotations.RegexPrefixKey]; ok {
regexPrefix = prefix
}
ingressSpec := ingress.Spec
secretToSNIs.addFromIngressV1TLS(knativeIngressToNetworkingTLS(ingress.Spec.TLS), ingress)
routeName := routeNamer(p.failuresCollector, ingress)
var objectSuccessfullyParsed bool
for i, rule := range ingressSpec.Rules {
hosts := rule.Hosts
if rule.HTTP == nil {
continue
}
for j, rule := range rule.HTTP.Paths {
path := rule.Path
path = maybePrependRegexPrefix(path, regexPrefix, icp.EnableLegacyRegexDetection && p.featureFlags.RegexPathPrefix)
if path == "" {
path = "/"
}
r := kongstate.Route{
Ingress: util.FromK8sObject(ingress),
Route: kong.Route{
Name: routeName(i, j),
Paths: kong.StringSlice(path),
StripPath: kong.Bool(false),
PreserveHost: kong.Bool(true),
Protocols: kong.StringSlice("http", "https"),
RegexPriority: kong.Int(0),
RequestBuffering: kong.Bool(true),
ResponseBuffering: kong.Bool(true),
Tags: util.GenerateTagsForObject(ingress),
},
}
r.Hosts = kong.StringSlice(hosts...)
knativeBackend := knativeSelectSplit(rule.Splits)
serviceName := fmt.Sprintf("%s.%s.%s", knativeBackend.ServiceNamespace, knativeBackend.ServiceName,
knativeBackend.ServicePort.String())
serviceHost := fmt.Sprintf("%s.%s.%s.svc", knativeBackend.ServiceName, knativeBackend.ServiceNamespace,
knativeBackend.ServicePort.String())
service, ok := services[serviceName]
if !ok {
var headers []string
for key, value := range knativeBackend.AppendHeaders {
headers = append(headers, key+":"+value)
}
for key, value := range rule.AppendHeaders {
headers = append(headers, key+":"+value)
}
service = kongstate.Service{
Service: kong.Service{
Name: kong.String(serviceName),
Host: kong.String(serviceHost),
Port: kong.Int(DefaultHTTPPort),
Protocol: kong.String("http"),
Path: kong.String("/"),
ConnectTimeout: kong.Int(DefaultServiceTimeout),
ReadTimeout: kong.Int(DefaultServiceTimeout),
WriteTimeout: kong.Int(DefaultServiceTimeout),
Retries: kong.Int(DefaultRetries),
},
Namespace: ingress.Namespace,
Backends: []kongstate.ServiceBackend{{
Name: knativeBackend.ServiceName,
PortDef: translators.PortDefFromIntStr(knativeBackend.ServicePort),
}},
Parent: ingress,
}
if len(headers) > 0 {
service.Plugins = append(service.Plugins, kong.Plugin{
Name: kong.String("request-transformer"),
Config: kong.Configuration{
"add": map[string]interface{}{
"headers": headers,
},
},
})
}
}
service.Routes = append(service.Routes, r)
services[serviceName] = service
objectSuccessfullyParsed = true
}
}
if objectSuccessfullyParsed {
p.registerSuccessfullyParsedObject(ingress)
}
}
// Knative handling is odd and doesn't update SNTS like other translators, and it does not get parent info as such.
// It shouldn't need parent info since it doesn't have any of the special cases (multi-service backends, default
// backend) that require parent info to populate Kubernetes resource tags on Kong services
result.ServiceNameToServices = services
result.SecretNameToSNIs = secretToSNIs
return result
}
func knativeSelectSplit(splits []knative.IngressBackendSplit) knative.IngressBackendSplit {
if len(splits) == 0 {
return knative.IngressBackendSplit{}
}
res := splits[0]
maxPercentage := splits[0].Percent
if len(splits) == 1 {
return res
}
for i := 1; i < len(splits); i++ {
if splits[i].Percent > maxPercentage {
res = splits[i]
maxPercentage = res.Percent
}
}
return res
}