xds/server: fix RDS handling for non-inline route configs (#6915)

internal/internal.go

@@ -68,11 +68,6 @@ var (
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
 	CanonicalString any // func (codes.Code) string
-	// DrainServerTransports initiates a graceful close of existing connections
-	// on a gRPC server accepted on the provided listener address. An
-	// xDS-enabled server invokes this method on a grpc.Server when a particular
-	// listener moves to "not-serving" mode.
-	DrainServerTransports any // func(*grpc.Server, string)
 	// IsRegisteredMethod returns whether the passed in method is registered as
 	// a method on the server.
 	IsRegisteredMethod any // func(*grpc.Server, string) bool
@@ -188,6 +183,15 @@ var (
 	ExitIdleModeForTesting any // func(*grpc.ClientConn) error
 
 	ChannelzTurnOffForTesting func()
+
+	// TriggerXDSResourceNameNotFoundForTesting triggers the resource-not-found
+	// error for a given resource type and name. This is usually triggered when
+	// the associated watch timer fires. For testing purposes, having this
+	// function makes events more predictable than relying on timer events.
+	TriggerXDSResourceNameNotFoundForTesting any // func(func(xdsresource.Type, string), string, string) error
+	// TriggerXDSResourceNotFoundClient invokes the testing xDS Client singleton
+	// to invoke resource not found for a resource type name and resource name.
+	TriggerXDSResourceNameNotFoundClient any // func(string, string) error
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.

internal/testutils/xds/e2e/clientresources.go

@@ -137,6 +137,72 @@ func marshalAny(m proto.Message) *anypb.Any {
 	return a
 }
 
+// filterChainWontMatch returns a filter chain that won't match if running the
+// test locally.
+func filterChainWontMatch(routeName string, addressPrefix string, srcPorts []uint32) *v3listenerpb.FilterChain {
+	hcm := &v3httppb.HttpConnectionManager{
+		RouteSpecifier: &v3httppb.HttpConnectionManager_Rds{
+			Rds: &v3httppb.Rds{
+				ConfigSource: &v3corepb.ConfigSource{
+					ConfigSourceSpecifier: &v3corepb.ConfigSource_Ads{Ads: &v3corepb.AggregatedConfigSource{}},
+				},
+				RouteConfigName: routeName,
+			},
+		},
+		HttpFilters: []*v3httppb.HttpFilter{RouterHTTPFilter},
+	}
+	return &v3listenerpb.FilterChain{
+		Name: routeName + "-wont-match",
+		FilterChainMatch: &v3listenerpb.FilterChainMatch{
+			PrefixRanges: []*v3corepb.CidrRange{
+				{
+					AddressPrefix: addressPrefix,
+					PrefixLen: &wrapperspb.UInt32Value{
+						Value: uint32(0),
+					},
+				},
+			},
+			SourceType:  v3listenerpb.FilterChainMatch_SAME_IP_OR_LOOPBACK,
+			SourcePorts: srcPorts,
+			SourcePrefixRanges: []*v3corepb.CidrRange{
+				{
+					AddressPrefix: addressPrefix,
+					PrefixLen: &wrapperspb.UInt32Value{
+						Value: uint32(0),
+					},
+				},
+			},
+		},
+		Filters: []*v3listenerpb.Filter{
+			{
+				Name:       "filter-1",
+				ConfigType: &v3listenerpb.Filter_TypedConfig{TypedConfig: marshalAny(hcm)},
+			},
+		},
+	}
+}
+
+// ListenerResourceThreeRouteResources returns a listener resource that points
+// to three route configurations. Only the filter chain that points to the first
+// route config can be matched to.
+func ListenerResourceThreeRouteResources(host string, port uint32, secLevel SecurityLevel, routeName string) *v3listenerpb.Listener {
+	lis := defaultServerListenerCommon(host, port, secLevel, routeName, false)
+	lis.FilterChains = append(lis.FilterChains, filterChainWontMatch("routeName2", "1.1.1.1", []uint32{1}))
+	lis.FilterChains = append(lis.FilterChains, filterChainWontMatch("routeName3", "2.2.2.2", []uint32{2}))
+	return lis
+}
+
+// ListenerResourceFallbackToDefault returns a listener resource that contains a
+// filter chain that will never get chosen to process traffic and a default
+// filter chain. The default filter chain points to routeName2.
+func ListenerResourceFallbackToDefault(host string, port uint32, secLevel SecurityLevel) *v3listenerpb.Listener {
+	lis := defaultServerListenerCommon(host, port, secLevel, "", false)
+	lis.FilterChains = nil
+	lis.FilterChains = append(lis.FilterChains, filterChainWontMatch("routeName", "1.1.1.1", []uint32{1}))
+	lis.DefaultFilterChain = filterChainWontMatch("routeName2", "2.2.2.2", []uint32{2})
+	return lis
+}
+
 // DefaultServerListener returns a basic xds Listener resource to be used on the
 // server side. The returned Listener resource contains an inline route
 // configuration with the name of routeName.
@@ -290,13 +356,6 @@ func defaultServerListenerCommon(host string, port uint32, secLevel SecurityLeve
 	}
 }
 
-// DefaultServerListenerWithRouteConfigName returns a basic xds Listener
-// resource to be used on the server side. The returned Listener resource
-// contains a RouteCongiguration resource name that needs to be resolved.
-func DefaultServerListenerWithRouteConfigName(host string, port uint32, secLevel SecurityLevel, routeName string) *v3listenerpb.Listener {
-	return defaultServerListenerCommon(host, port, secLevel, routeName, false)
-}
-
 // HTTPFilter constructs an xds HttpFilter with the provided name and config.
 func HTTPFilter(name string, config proto.Message) *v3httppb.HttpFilter {
 	return &v3httppb.HttpFilter{
@@ -356,7 +415,6 @@ type RouteConfigOptions struct {
 	ListenerName string
 	// ClusterSpecifierType determines the cluster specifier type.
 	ClusterSpecifierType RouteConfigClusterSpecifierType
-
 	// ClusterName is name of the cluster resource used when the cluster
 	// specifier type is set to RouteConfigClusterSpecifierTypeCluster.
 	//
@@ -722,3 +780,65 @@ func EndpointResourceWithOptions(opts EndpointOptions) *v3endpointpb.ClusterLoad
 	}
 	return cla
 }
+
+// DefaultServerListenerWithRouteConfigName returns a basic xds Listener
+// resource to be used on the server side. The returned Listener resource
+// contains a RouteCongiguration resource name that needs to be resolved.
+func DefaultServerListenerWithRouteConfigName(host string, port uint32, secLevel SecurityLevel, routeName string) *v3listenerpb.Listener {
+	return defaultServerListenerCommon(host, port, secLevel, routeName, false)
+}
+
+// RouteConfigNoRouteMatch returns an xDS RouteConfig resource which a route
+// with no route match. This will be NACKed by the xDS Client.
+func RouteConfigNoRouteMatch(routeName string) *v3routepb.RouteConfiguration {
+	return &v3routepb.RouteConfiguration{
+		Name: routeName,
+		VirtualHosts: []*v3routepb.VirtualHost{{
+			// This "*" string matches on any incoming authority. This is to ensure any
+			// incoming RPC matches to Route_NonForwardingAction and will proceed as
+			// normal.
+			Domains: []string{"*"},
+			Routes: []*v3routepb.Route{{
+				Action: &v3routepb.Route_NonForwardingAction{},
+			}}}}}
+}
+
+// RouteConfigNonForwardingAction returns an xDS RouteConfig resource which
+// specifies to route to a route specifying non forwarding action. This is
+// intended to be used on the server side for RDS requests, and corresponds to
+// the inline route configuration in DefaultServerListener.
+func RouteConfigNonForwardingAction(routeName string) *v3routepb.RouteConfiguration {
+	return &v3routepb.RouteConfiguration{
+		Name: routeName,
+		VirtualHosts: []*v3routepb.VirtualHost{{
+			// This "*" string matches on any incoming authority. This is to ensure any
+			// incoming RPC matches to Route_NonForwardingAction and will proceed as
+			// normal.
+			Domains: []string{"*"},
+			Routes: []*v3routepb.Route{{
+				Match: &v3routepb.RouteMatch{
+					PathSpecifier: &v3routepb.RouteMatch_Prefix{Prefix: "/"},
+				},
+				Action: &v3routepb.Route_NonForwardingAction{},
+			}}}}}
+}
+
+// RouteConfigFilterAction returns an xDS RouteConfig resource which specifies
+// to route to a route specifying route filter action. Since this is not type
+// non forwarding action, this should fail requests that match to this server
+// side.
+func RouteConfigFilterAction(routeName string) *v3routepb.RouteConfiguration {
+	return &v3routepb.RouteConfiguration{
+		Name: routeName,
+		VirtualHosts: []*v3routepb.VirtualHost{{
+			// This "*" string matches on any incoming authority. This is to
+			// ensure any incoming RPC matches to Route_Route and will fail with
+			// UNAVAILABLE.
+			Domains: []string{"*"},
+			Routes: []*v3routepb.Route{{
+				Match: &v3routepb.RouteMatch{
+					PathSpecifier: &v3routepb.RouteMatch_Prefix{Prefix: "/"},
+				},
+				Action: &v3routepb.Route_FilterAction{},
+			}}}}}
+}

server.go

@@ -74,9 +74,6 @@ func init() {
 		return srv.isRegisteredMethod(method)
 	}
 	internal.ServerFromContext = serverFromContext
-	internal.DrainServerTransports = func(srv *Server, addr string) {
-		srv.drainServerTransports(addr)
-	}
 	internal.AddGlobalServerOptions = func(opt ...ServerOption) {
 		globalServerOptions = append(globalServerOptions, opt...)
 	}
@@ -932,6 +929,12 @@ func (s *Server) handleRawConn(lisAddr string, rawConn net.Conn) {
 		return
 	}
 
+	if cc, ok := rawConn.(interface {
+		PassServerTransport(transport.ServerTransport)
+	}); ok {
+		cc.PassServerTransport(st)
+	}
+
 	if !s.addConn(lisAddr, st) {
 		return
 	}
@@ -941,15 +944,6 @@ func (s *Server) handleRawConn(lisAddr string, rawConn net.Conn) {
 	}()
 }
 
-func (s *Server) drainServerTransports(addr string) {
-	s.mu.Lock()
-	conns := s.conns[addr]
-	for st := range conns {
-		st.Drain("")
-	}
-	s.mu.Unlock()
-}
-
 // newHTTP2Transport sets up a http/2 transport (using the
 // gRPC http2 server transport in transport/http2_server.go).
 func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {

test/xds/xds_server_certificate_providers_test.go

@@ -28,14 +28,12 @@ import (
 
 	"github.com/google/uuid"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials/insecure"
 	xdscreds "google.golang.org/grpc/credentials/xds"
 	"google.golang.org/grpc/internal/testutils"
 	"google.golang.org/grpc/internal/testutils/xds/bootstrap"
 	"google.golang.org/grpc/internal/testutils/xds/e2e"
-	"google.golang.org/grpc/status"
 	"google.golang.org/grpc/xds"
 	"google.golang.org/protobuf/types/known/wrapperspb"
 
@@ -233,12 +231,7 @@ func (s) TestServerSideXDS_WithNoCertificateProvidersInBootstrap_Failure(t *test
 	}
 	defer cc.Close()
 
-	client := testgrpc.NewTestServiceClient(cc)
-	sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
-	defer sCancel()
-	if _, err := client.EmptyCall(sCtx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
-		t.Fatalf("EmptyCall() failed: %v, wantCode: %s", err, codes.DeadlineExceeded)
-	}
+	waitForFailedRPCWithStatus(ctx, t, cc, errAcceptAndClose)
 }
 
 // Tests the case where the bootstrap configuration contains one certificate
@@ -484,10 +477,5 @@ func (s) TestServerSideXDS_WithValidAndInvalidSecurityConfiguration(t *testing.T
 	}
 	defer cc2.Close()
 
-	client2 := testgrpc.NewTestServiceClient(cc2)
-	sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
-	defer sCancel()
-	if _, err := client2.EmptyCall(sCtx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
-		t.Fatalf("EmptyCall() failed: %v, wantCode: %s", err, codes.DeadlineExceeded)
-	}
+	waitForFailedRPCWithStatus(ctx, t, cc2, errAcceptAndClose)
 }

test/xds/xds_server_integration_test.go

@@ -21,6 +21,7 @@ package xds_test
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
 	"strconv"
 	"testing"
@@ -50,6 +51,15 @@ func (*testService) UnaryCall(context.Context, *testpb.SimpleRequest) (*testpb.S
 	return &testpb.SimpleResponse{}, nil
 }
 
+func (*testService) FullDuplexCall(stream testgrpc.TestService_FullDuplexCallServer) error {
+	for {
+		_, err := stream.Recv() // hangs here forever if stream doesn't shut down...doesn't receive EOF without any errors
+		if err == io.EOF {
+			return nil
+		}
+	}
+}
+
 func testModeChangeServerOption(t *testing.T) grpc.ServerOption {
 	// Create a server option to get notified about serving mode changes. We don't
 	// do anything other than throwing a log entry here. But this is required,

test/xds/xds_server_serving_mode_test.go

@@ -386,7 +386,7 @@ func waitForFailedRPC(ctx context.Context, t *testing.T, cc *grpc.ClientConn) {
 		return
 	}
 
-	ticker := time.NewTimer(1 * time.Second)
+	ticker := time.NewTicker(10 * time.Millisecond)
 	defer ticker.Stop()
 	for {
 		select {