Add http2 and grpc support to ingress gateways (#8458)

.changelog/8458.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+connect: Add support for http2 and grpc to ingress gateways
+```

agent/structs/config_entry_gateways.go

@@ -38,7 +38,7 @@ type IngressListener struct {
 	// Protocol declares what type of traffic this listener is expected to
 	// receive. Depending on the protocol, a listener might support multiplexing
 	// services over a single port, or additional discovery chain features. The
-	// current supported values are: (tcp | http).
+	// current supported values are: (tcp | http | http2 | grpc).
 	Protocol string
 
 	// Services declares the set of services to which the listener forwards
@@ -122,8 +122,10 @@ func (e *IngressGatewayConfigEntry) Normalize() error {
 
 func (e *IngressGatewayConfigEntry) Validate() error {
 	validProtocols := map[string]bool{
-		"http": true,
+		"tcp":   true,
-		"tcp":  true,
+		"http":  true,
+		"http2": true,
+		"grpc":  true,
 	}
 	declaredPorts := make(map[int]bool)
 
@@ -134,7 +136,7 @@ func (e *IngressGatewayConfigEntry) Validate() error {
 		declaredPorts[listener.Port] = true
 
 		if _, ok := validProtocols[listener.Protocol]; !ok {
-			return fmt.Errorf("Protocol must be either 'http' or 'tcp', '%s' is an unsupported protocol.", listener.Protocol)
+			return fmt.Errorf("protocol must be 'tcp', 'http', 'http2', or 'grpc'. '%s' is an unsupported protocol", listener.Protocol)
 		}
 
 		if len(listener.Services) == 0 {

agent/structs/config_entry_gateways_test.go

@@ -326,7 +326,7 @@ func TestIngressConfigEntry_Validate(t *testing.T) {
 					},
 				},
 			},
-			expectErr: "Protocol must be either 'http' or 'tcp', 'asdf' is an unsupported protocol.",
+			expectErr: "protocol must be 'tcp', 'http', 'http2', or 'grpc'. 'asdf' is an unsupported protocol",
 		},
 		{
 			name: "hosts cannot be set on a tcp listener",

api/config_entry_gateways.go

@@ -44,7 +44,7 @@ type IngressListener struct {
 	// Protocol declares what type of traffic this listener is expected to
 	// receive. Depending on the protocol, a listener might support multiplexing
 	// services over a single port, or additional discovery chain features. The
-	// current supported values are: (tcp | http).
+	// current supported values are: (tcp | http | http2 | grpc).
 	Protocol string
 
 	// Services declares the set of services to which the listener forwards

test/integration/connect/envoy/case-ingress-gateway-grpc/capture.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+snapshot_envoy_admin localhost:20000 ingress-gateway primary || true

test/integration/connect/envoy/case-ingress-gateway-grpc/config_entries.hcl

@@ -0,0 +1,26 @@
+enable_central_service_config = true
+
+config_entries {
+  bootstrap {
+    kind = "service-defaults"
+    name = "s1"
+    protocol = "grpc"
+  }
+  bootstrap {
+    kind = "ingress-gateway"
+    name = "ingress-gateway"
+
+    listeners = [
+      {
+        port = 9999
+        protocol = "grpc"
+        services = [
+          {
+            name = "s1"
+            hosts = ["localhost:9999"]
+          }
+        ]
+      }
+    ]
+  }
+}

test/integration/connect/envoy/case-ingress-gateway-grpc/gateway.hcl

@@ -0,0 +1,4 @@
+services {
+  name = "ingress-gateway"
+  kind = "ingress-gateway"
+}

test/integration/connect/envoy/case-ingress-gateway-grpc/s1.hcl

@@ -0,0 +1,13 @@
+services {
+  name = "s1"
+  port = 8079
+  connect {
+    sidecar_service {
+      proxy {
+        config {
+          protocol = "grpc"
+        }
+      }
+    }
+  }
+}

test/integration/connect/envoy/case-ingress-gateway-grpc/setup.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# wait for bootstrap to apply config entries
+wait_for_config_entry ingress-gateway ingress-gateway
+
+gen_envoy_bootstrap ingress-gateway 20000 primary true
+gen_envoy_bootstrap s1 19000
+gen_envoy_bootstrap s2 19001

test/integration/connect/envoy/case-ingress-gateway-grpc/vars.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+export REQUIRED_SERVICES="$DEFAULT_REQUIRED_SERVICES ingress-gateway-primary"

test/integration/connect/envoy/case-ingress-gateway-grpc/verify.bats

@@ -0,0 +1,32 @@
+#!/usr/bin/env bats
+
+load helpers
+
+@test "ingress proxy admin is up on :20000" {
+  retry_default curl -f -s localhost:20000/stats -o /dev/null
+}
+
+@test "s1 proxy admin is up on :19000" {
+  retry_default curl -f -s localhost:19000/stats -o /dev/null
+}
+
+@test "s2 proxy admin is up on :19001" {
+  retry_default curl -f -s localhost:19001/stats -o /dev/null
+}
+
+@test "s1 proxy listener should be up and have right cert" {
+  assert_proxy_presents_cert_uri localhost:21000 s1
+}
+
+@test "ingress-gateway should have healthy endpoints for s1" {
+   assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s1 HEALTHY 1
+}
+
+@test "ingress should be able to connect to s1 via grpc" {
+  # This test also covers http2 since gRPC always uses http2
+  run fortio grpcping localhost:9999
+
+  echo "OUTPUT: $output"
+
+  [ "$status" == 0 ]
+}

test/integration/connect/envoy/main_test.go

@@ -33,6 +33,7 @@ func TestEnvoy(t *testing.T) {
 		"case-http",
 		"case-http-badauthz",
 		"case-ingress-gateway-http",
+		"case-ingress-gateway-grpc",
 		"case-ingress-gateway-multiple-services",
 		"case-ingress-gateway-simple",
 		"case-ingress-gateway-tls",

website/pages/docs/agent/config-entries/ingress-gateway.mdx

@@ -343,7 +343,7 @@ Also make two services in the frontend namespace available over a custom port wi
   - `Port` `(int: 0)` - The port that the listener should receive traffic on.
 
   - `Protocol` `(string: "tcp")` - The protocol associated with the listener.
-    Either `tcp` or `http`.
+    One of `tcp`, `http`, `http2`, or `grpc`.
 
   - `Services` `(array<IngressService>: <optional>)` - A list of services to be
     exposed via this listener. For "tcp" listeners, only a single service is