408 lines
14 KiB
Go
408 lines
14 KiB
Go
package gateway
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/rs/zerolog/log"
|
|
"github.com/traefik/traefik/v3/pkg/config/dynamic"
|
|
"github.com/traefik/traefik/v3/pkg/provider"
|
|
"google.golang.org/grpc/codes"
|
|
corev1 "k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
ktypes "k8s.io/apimachinery/pkg/types"
|
|
"k8s.io/utils/ptr"
|
|
gatev1 "sigs.k8s.io/gateway-api/apis/v1"
|
|
)
|
|
|
|
// TODO: as described in the specification https://gateway-api.sigs.k8s.io/reference/spec/#gateway.networking.k8s.io%2fv1.GRPCRoute, we should check for hostname conflicts between HTTP and GRPC routes.
|
|
func (p *Provider) loadGRPCRoutes(ctx context.Context, gatewayListeners []gatewayListener, conf *dynamic.Configuration) {
|
|
routes, err := p.client.ListGRPCRoutes()
|
|
if err != nil {
|
|
log.Ctx(ctx).Error().Err(err).Msg("Unable to list GRPCRoutes")
|
|
return
|
|
}
|
|
|
|
for _, route := range routes {
|
|
logger := log.Ctx(ctx).With().
|
|
Str("grpc_route", route.Name).
|
|
Str("namespace", route.Namespace).
|
|
Logger()
|
|
|
|
var parentStatuses []gatev1.RouteParentStatus
|
|
for _, parentRef := range route.Spec.ParentRefs {
|
|
parentStatus := &gatev1.RouteParentStatus{
|
|
ParentRef: parentRef,
|
|
ControllerName: controllerName,
|
|
Conditions: []metav1.Condition{
|
|
{
|
|
Type: string(gatev1.RouteConditionAccepted),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonNoMatchingParent),
|
|
},
|
|
},
|
|
}
|
|
|
|
for _, listener := range gatewayListeners {
|
|
if !matchListener(listener, route.Namespace, parentRef) {
|
|
continue
|
|
}
|
|
|
|
accepted := true
|
|
if !allowRoute(listener, route.Namespace, kindGRPCRoute) {
|
|
parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonNotAllowedByListeners))
|
|
accepted = false
|
|
}
|
|
hostnames, ok := findMatchingHostnames(listener.Hostname, route.Spec.Hostnames)
|
|
if !ok {
|
|
parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonNoMatchingListenerHostname))
|
|
accepted = false
|
|
}
|
|
|
|
if accepted {
|
|
// Gateway listener should have AttachedRoutes set even when Gateway has unresolved refs.
|
|
listener.Status.AttachedRoutes++
|
|
// Only consider the route attached if the listener is in an "attached" state.
|
|
if listener.Attached {
|
|
parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonAccepted))
|
|
}
|
|
}
|
|
|
|
routeConf, resolveRefCondition := p.loadGRPCRoute(logger.WithContext(ctx), listener, route, hostnames)
|
|
if accepted && listener.Attached {
|
|
mergeHTTPConfiguration(routeConf, conf)
|
|
}
|
|
|
|
parentStatus.Conditions = upsertRouteConditionResolvedRefs(parentStatus.Conditions, resolveRefCondition)
|
|
}
|
|
|
|
parentStatuses = append(parentStatuses, *parentStatus)
|
|
}
|
|
|
|
status := gatev1.GRPCRouteStatus{
|
|
RouteStatus: gatev1.RouteStatus{
|
|
Parents: parentStatuses,
|
|
},
|
|
}
|
|
if err := p.client.UpdateGRPCRouteStatus(ctx, ktypes.NamespacedName{Namespace: route.Namespace, Name: route.Name}, status); err != nil {
|
|
logger.Warn().
|
|
Err(err).
|
|
Msg("Unable to update GRPCRoute status")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (p *Provider) loadGRPCRoute(ctx context.Context, listener gatewayListener, route *gatev1.GRPCRoute, hostnames []gatev1.Hostname) (*dynamic.Configuration, metav1.Condition) {
|
|
conf := &dynamic.Configuration{
|
|
HTTP: &dynamic.HTTPConfiguration{
|
|
Routers: make(map[string]*dynamic.Router),
|
|
Middlewares: make(map[string]*dynamic.Middleware),
|
|
Services: make(map[string]*dynamic.Service),
|
|
ServersTransports: make(map[string]*dynamic.ServersTransport),
|
|
},
|
|
}
|
|
|
|
condition := metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionTrue,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteConditionResolvedRefs),
|
|
}
|
|
|
|
for ri, routeRule := range route.Spec.Rules {
|
|
// Adding the gateway desc and the entryPoint desc prevents overlapping of routers build from the same routes.
|
|
routeKey := provider.Normalize(fmt.Sprintf("%s-%s-%s-%s-%d", route.Namespace, route.Name, listener.GWName, listener.EPName, ri))
|
|
|
|
matches := routeRule.Matches
|
|
if len(matches) == 0 {
|
|
matches = []gatev1.GRPCRouteMatch{{}}
|
|
}
|
|
|
|
for _, match := range matches {
|
|
rule, priority := buildGRPCMatchRule(hostnames, match)
|
|
|
|
router := dynamic.Router{
|
|
RuleSyntax: "v3",
|
|
Rule: rule,
|
|
Priority: priority,
|
|
EntryPoints: []string{listener.EPName},
|
|
}
|
|
if listener.Protocol == gatev1.HTTPSProtocolType {
|
|
router.TLS = &dynamic.RouterTLSConfig{}
|
|
}
|
|
|
|
var err error
|
|
routerName := makeRouterName(rule, routeKey)
|
|
router.Middlewares, err = p.loadGRPCMiddlewares(conf, route.Namespace, routerName, routeRule.Filters)
|
|
switch {
|
|
case err != nil:
|
|
log.Ctx(ctx).Error().Err(err).Msg("Unable to load GRPC route filters")
|
|
|
|
errWrrName := routerName + "-err-wrr"
|
|
conf.HTTP.Services[errWrrName] = &dynamic.Service{
|
|
Weighted: &dynamic.WeightedRoundRobin{
|
|
Services: []dynamic.WRRService{
|
|
{
|
|
Name: "invalid-grpcroute-filter",
|
|
GRPCStatus: &dynamic.GRPCStatus{
|
|
Code: codes.Unavailable,
|
|
Msg: "Service Unavailable",
|
|
},
|
|
Weight: ptr.To(1),
|
|
},
|
|
},
|
|
},
|
|
}
|
|
router.Service = errWrrName
|
|
|
|
default:
|
|
var serviceCondition *metav1.Condition
|
|
router.Service, serviceCondition = p.loadGRPCService(conf, routeKey, routeRule, route)
|
|
if serviceCondition != nil {
|
|
condition = *serviceCondition
|
|
}
|
|
}
|
|
|
|
conf.HTTP.Routers[routerName] = &router
|
|
}
|
|
}
|
|
|
|
return conf, condition
|
|
}
|
|
|
|
func (p *Provider) loadGRPCService(conf *dynamic.Configuration, routeKey string, routeRule gatev1.GRPCRouteRule, route *gatev1.GRPCRoute) (string, *metav1.Condition) {
|
|
name := routeKey + "-wrr"
|
|
if _, ok := conf.HTTP.Services[name]; ok {
|
|
return name, nil
|
|
}
|
|
|
|
var wrr dynamic.WeightedRoundRobin
|
|
var condition *metav1.Condition
|
|
for _, backendRef := range routeRule.BackendRefs {
|
|
svcName, svc, errCondition := p.loadGRPCBackendRef(route, backendRef)
|
|
weight := ptr.To(int(ptr.Deref(backendRef.Weight, 1)))
|
|
if errCondition != nil {
|
|
condition = errCondition
|
|
wrr.Services = append(wrr.Services, dynamic.WRRService{
|
|
Name: svcName,
|
|
GRPCStatus: &dynamic.GRPCStatus{
|
|
Code: codes.Unavailable,
|
|
Msg: "Service Unavailable",
|
|
},
|
|
Weight: weight,
|
|
})
|
|
continue
|
|
}
|
|
|
|
if svc != nil {
|
|
conf.HTTP.Services[svcName] = svc
|
|
}
|
|
|
|
wrr.Services = append(wrr.Services, dynamic.WRRService{
|
|
Name: svcName,
|
|
Weight: weight,
|
|
})
|
|
}
|
|
|
|
conf.HTTP.Services[name] = &dynamic.Service{Weighted: &wrr}
|
|
return name, condition
|
|
}
|
|
|
|
func (p *Provider) loadGRPCBackendRef(route *gatev1.GRPCRoute, backendRef gatev1.GRPCBackendRef) (string, *dynamic.Service, *metav1.Condition) {
|
|
kind := ptr.Deref(backendRef.Kind, kindService)
|
|
|
|
group := groupCore
|
|
if backendRef.Group != nil && *backendRef.Group != "" {
|
|
group = string(*backendRef.Group)
|
|
}
|
|
|
|
namespace := route.Namespace
|
|
if backendRef.Namespace != nil && *backendRef.Namespace != "" {
|
|
namespace = string(*backendRef.Namespace)
|
|
}
|
|
|
|
serviceName := provider.Normalize(namespace + "-" + string(backendRef.Name))
|
|
|
|
if group != groupCore || kind != kindService {
|
|
return serviceName, nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonInvalidKind),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s/%s/%s: only Kubernetes services are supported", group, kind, namespace, backendRef.Name),
|
|
}
|
|
}
|
|
|
|
if err := p.isReferenceGranted(kindGRPCRoute, route.Namespace, group, string(kind), string(backendRef.Name), namespace); err != nil {
|
|
return serviceName, nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonRefNotPermitted),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s/%s/%s: %s", group, kind, namespace, backendRef.Name, err),
|
|
}
|
|
}
|
|
|
|
port := ptr.Deref(backendRef.Port, gatev1.PortNumber(0))
|
|
if port == 0 {
|
|
return serviceName, nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonUnsupportedProtocol),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s/%s/%s: port is required", group, kind, namespace, backendRef.Name),
|
|
}
|
|
}
|
|
|
|
portStr := strconv.FormatInt(int64(port), 10)
|
|
serviceName = provider.Normalize(serviceName + "-" + portStr)
|
|
|
|
lb, errCondition := p.loadGRPCServers(namespace, route, backendRef)
|
|
if errCondition != nil {
|
|
return serviceName, nil, errCondition
|
|
}
|
|
|
|
return serviceName, &dynamic.Service{LoadBalancer: lb}, nil
|
|
}
|
|
|
|
func (p *Provider) loadGRPCMiddlewares(conf *dynamic.Configuration, namespace, routerName string, filters []gatev1.GRPCRouteFilter) ([]string, error) {
|
|
middlewares := make(map[string]*dynamic.Middleware)
|
|
for i, filter := range filters {
|
|
name := fmt.Sprintf("%s-%s-%d", routerName, strings.ToLower(string(filter.Type)), i)
|
|
switch filter.Type {
|
|
case gatev1.GRPCRouteFilterRequestHeaderModifier:
|
|
middlewares[name] = createRequestHeaderModifier(filter.RequestHeaderModifier)
|
|
|
|
case gatev1.GRPCRouteFilterExtensionRef:
|
|
name, middleware, err := p.loadHTTPRouteFilterExtensionRef(namespace, filter.ExtensionRef)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("loading ExtensionRef filter %s: %w", filter.Type, err)
|
|
}
|
|
|
|
middlewares[name] = middleware
|
|
|
|
default:
|
|
// As per the spec: https://gateway-api.sigs.k8s.io/api-types/httproute/#filters-optional
|
|
// In all cases where incompatible or unsupported filters are
|
|
// specified, implementations MUST add a warning condition to
|
|
// status.
|
|
return nil, fmt.Errorf("unsupported filter %s", filter.Type)
|
|
}
|
|
}
|
|
|
|
var middlewareNames []string
|
|
for name, middleware := range middlewares {
|
|
if middleware != nil {
|
|
conf.HTTP.Middlewares[name] = middleware
|
|
}
|
|
|
|
middlewareNames = append(middlewareNames, name)
|
|
}
|
|
|
|
return middlewareNames, nil
|
|
}
|
|
|
|
func (p *Provider) loadGRPCServers(namespace string, route *gatev1.GRPCRoute, backendRef gatev1.GRPCBackendRef) (*dynamic.ServersLoadBalancer, *metav1.Condition) {
|
|
backendAddresses, svcPort, err := p.getBackendAddresses(namespace, backendRef.BackendRef)
|
|
if err != nil {
|
|
return nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonBackendNotFound),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s: %s", namespace, backendRef.Name, err),
|
|
}
|
|
}
|
|
|
|
if svcPort.Protocol != corev1.ProtocolTCP {
|
|
return nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonUnsupportedProtocol),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s: only TCP protocol is supported", namespace, backendRef.Name),
|
|
}
|
|
}
|
|
|
|
if svcPort.AppProtocol != nil && *svcPort.AppProtocol != appProtocolH2C {
|
|
return nil, &metav1.Condition{
|
|
Type: string(gatev1.RouteConditionResolvedRefs),
|
|
Status: metav1.ConditionFalse,
|
|
ObservedGeneration: route.Generation,
|
|
LastTransitionTime: metav1.Now(),
|
|
Reason: string(gatev1.RouteReasonUnsupportedProtocol),
|
|
Message: fmt.Sprintf("Cannot load GRPCBackendRef %s/%s: only kubernetes.io/h2c appProtocol is supported", namespace, backendRef.Name),
|
|
}
|
|
}
|
|
|
|
lb := &dynamic.ServersLoadBalancer{}
|
|
lb.SetDefaults()
|
|
|
|
for _, ba := range backendAddresses {
|
|
lb.Servers = append(lb.Servers, dynamic.Server{
|
|
URL: fmt.Sprintf("h2c://%s", net.JoinHostPort(ba.Address, strconv.Itoa(int(ba.Port)))),
|
|
})
|
|
}
|
|
return lb, nil
|
|
}
|
|
|
|
func buildGRPCMatchRule(hostnames []gatev1.Hostname, match gatev1.GRPCRouteMatch) (string, int) {
|
|
var matchRules []string
|
|
|
|
methodRule := buildGRPCMethodRule(match.Method)
|
|
matchRules = append(matchRules, methodRule)
|
|
|
|
headerRules := buildGRPCHeaderRules(match.Headers)
|
|
matchRules = append(matchRules, headerRules...)
|
|
|
|
matchRulesStr := strings.Join(matchRules, " && ")
|
|
|
|
hostRule, priority := buildHostRule(hostnames)
|
|
if hostRule == "" {
|
|
return matchRulesStr, len(matchRulesStr)
|
|
}
|
|
return hostRule + " && " + matchRulesStr, priority + len(matchRulesStr)
|
|
}
|
|
|
|
func buildGRPCMethodRule(method *gatev1.GRPCMethodMatch) string {
|
|
if method == nil {
|
|
return "PathPrefix(`/`)"
|
|
}
|
|
|
|
sExpr := "[^/]+"
|
|
if s := ptr.Deref(method.Service, ""); s != "" {
|
|
sExpr = s
|
|
}
|
|
|
|
mExpr := "[^/]+"
|
|
if m := ptr.Deref(method.Method, ""); m != "" {
|
|
mExpr = m
|
|
}
|
|
|
|
return fmt.Sprintf("PathRegexp(`/%s/%s`)", sExpr, mExpr)
|
|
}
|
|
|
|
func buildGRPCHeaderRules(headers []gatev1.GRPCHeaderMatch) []string {
|
|
var rules []string
|
|
for _, header := range headers {
|
|
switch ptr.Deref(header.Type, gatev1.GRPCHeaderMatchExact) {
|
|
case gatev1.GRPCHeaderMatchExact:
|
|
rules = append(rules, fmt.Sprintf("Header(`%s`,`%s`)", header.Name, header.Value))
|
|
case gatev1.GRPCHeaderMatchRegularExpression:
|
|
rules = append(rules, fmt.Sprintf("HeaderRegexp(`%s`,`%s`)", header.Name, header.Value))
|
|
}
|
|
}
|
|
|
|
return rules
|
|
}
|