Simple API Gateway e2e test for tcp routes (#16222)

* Simple API Gateway e2e test for tcp routes

* Drop DNSSans since we don't front the Gateway with a leaf cert

agent/proxycfg/api_gateway.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 
+	cachetype "github.com/hashicorp/consul/agent/cache-types"
 	"github.com/hashicorp/consul/agent/proxycfg/internal/watch"
 	"github.com/hashicorp/consul/agent/structs"
 	"github.com/hashicorp/consul/proto/pbpeering"
@@ -225,7 +226,7 @@ func (h *handlerAPIGateway) handleGatewayConfigUpdate(ctx context.Context, u Upd
 		return fmt.Errorf("invalid type for config entry: %T", resp.Entry)
 	}
 
-	return nil
+	return h.watchIngressLeafCert(ctx, snap)
 }
 
 // handleInlineCertConfigUpdate stores the certificate for the gateway
@@ -416,7 +417,7 @@ func (h *handlerAPIGateway) handleRouteConfigUpdate(ctx context.Context, u Updat
 //
 // TODO This would probably be more generally useful as a helper in the structs pkg
 func (h *handlerAPIGateway) referenceIsForListener(ref structs.ResourceReference, listener structs.APIGatewayListener, snap *ConfigSnapshot) bool {
-	if ref.Kind != snap.APIGateway.GatewayConfig.Kind {
+	if ref.Kind != structs.APIGateway && ref.Kind != "" {
 		return false
 	}
 	if ref.Name != snap.APIGateway.GatewayConfig.Name {
@@ -424,3 +425,30 @@ func (h *handlerAPIGateway) referenceIsForListener(ref structs.ResourceReference
 	}
 	return ref.SectionName == "" || ref.SectionName == listener.Name
 }
+
+func (h *handlerAPIGateway) watchIngressLeafCert(ctx context.Context, snap *ConfigSnapshot) error {
+	// Note that we DON'T test for TLS.enabled because we need a leaf cert for the
+	// gateway even without TLS to use as a client cert.
+	if !snap.APIGateway.GatewayConfigLoaded {
+		return nil
+	}
+
+	// Watch the leaf cert
+	if snap.APIGateway.LeafCertWatchCancel != nil {
+		snap.APIGateway.LeafCertWatchCancel()
+	}
+	ctx, cancel := context.WithCancel(ctx)
+	err := h.dataSources.LeafCertificate.Notify(ctx, &cachetype.ConnectCALeafRequest{
+		Datacenter:     h.source.Datacenter,
+		Token:          h.token,
+		Service:        h.service,
+		EnterpriseMeta: h.proxyID.EnterpriseMeta,
+	}, leafWatchID, h.ch)
+	if err != nil {
+		cancel()
+		return err
+	}
+	snap.APIGateway.LeafCertWatchCancel = cancel
+
+	return nil
+}

agent/proxycfg/snapshot.go

@@ -678,6 +678,10 @@ type configSnapshotAPIGateway struct {
 	TCPRoutes    watch.Map[structs.ResourceReference, *structs.TCPRouteConfigEntry]
 	Certificates watch.Map[structs.ResourceReference, *structs.InlineCertificateConfigEntry]
 
+	// LeafCertWatchCancel is a CancelFunc to use when refreshing this gateway's
+	// leaf cert watch with different parameters.
+	LeafCertWatchCancel context.CancelFunc
+
 	// Listeners is the original listener config from the api-gateway config
 	// entry to save us trying to pass fields through Upstreams
 	Listeners map[string]structs.APIGatewayListener
@@ -733,6 +737,7 @@ func (c *configSnapshotAPIGateway) ToIngress(datacenter string) (configSnapshotI
 	upstreams.DiscoveryChain = synthesizedChains
 
 	return configSnapshotIngressGateway{
+		Upstreams:               c.Upstreams,
 		ConfigSnapshotUpstreams: upstreams,
 		GatewayConfigLoaded:     true,
 		Listeners:               ingressListeners,
@@ -928,6 +933,7 @@ func (s *ConfigSnapshot) Valid() bool {
 	case structs.ServiceKindAPIGateway:
 		// TODO Is this the proper set of things to validate?
 		return s.Roots != nil &&
+			s.APIGateway.Leaf != nil &&
 			s.APIGateway.GatewayConfigLoaded &&
 			s.APIGateway.BoundGatewayConfigLoaded &&
 			s.APIGateway.AreHostsSet &&

test/integration/connect/envoy/case-api-gateway-smoke/verify.bats

@@ -1,7 +0,0 @@
-#!/usr/bin/env bats
-
-load helpers
-
-@test "api gateway proxy admin is up on :20000" {
-  retry_default curl -f -s localhost:20000/stats -o /dev/null
-}

test/integration/connect/envoy/case-api-gateway-tcp-simple/setup.sh

@@ -23,6 +23,7 @@ services = [
 ]
 parents = [
   {
+    kind = "api-gateway"
     name = "api-gateway"
   }
 ]

test/integration/connect/envoy/case-api-gateway-tcp-simple/verify.bats

@@ -0,0 +1,17 @@
+#!/usr/bin/env bats
+
+load helpers
+
+@test "api gateway proxy admin is up on :20000" {
+  retry_default curl -f -s localhost:20000/stats -o /dev/null
+}
+
+@test "api gateway should have healthy endpoints for s1" {
+  assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s1 HEALTHY 1
+}
+
+@test "api gateway should be able to connect to s1 via configured port" {
+  run retry_default curl -s -f -d hello localhost:9999
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"hello"* ]]
+}