Pass MeshGateway config in service config request

ResolveServiceConfig is called by service manager before the proxy
registration is in the catalog. Therefore we should pass proxy
registration flags in the request rather than trying to fetch
them from the state store (where they may not exist yet).

agent/consul/config_endpoint.go

@@ -445,27 +445,6 @@ func (c *ConfigEntry) ResolveServiceConfig(args *structs.ServiceConfigRequest, r
 				}
 			}
 
-			// The goal is to flatten the mesh gateway mode in this order:
-			// 	0. Value from centralized upstream_defaults
-			// 	1. Value from local proxy registration
-			// 	2. Value from centralized upstream_configs
-			// 	3. Value from local upstream definition. This last step is done in the client's service manager.
-			var registrationMGConfig structs.MeshGatewayConfig
-
-			if args.ID != "" && args.NodeName != "" {
-				index, registration, err := state.NodeServiceWatch(ws, args.NodeName, args.ID, &args.EnterpriseMeta)
-				if err != nil {
-					return fmt.Errorf("failed to query service registration")
-				}
-				if index > reply.Index {
-					reply.Index = index
-				}
-
-				if registration != nil && !registration.Proxy.MeshGateway.IsZero() {
-					registrationMGConfig = registration.Proxy.MeshGateway
-				}
-			}
-
 			// usConfigs stores the opaque config map for each upstream and is keyed on the upstream's ID.
 			usConfigs := make(map[structs.ServiceID]map[string]interface{})
 
@@ -500,10 +479,17 @@ func (c *ConfigEntry) ResolveServiceConfig(args *structs.ServiceConfigRequest, r
 				if upstreamDefaults != nil {
 					upstreamDefaults.MergeInto(resolvedCfg)
 				}
-				// The value from the proxy registration overrides the one from upstream_defaults because
-				// it is specific to the proxy instance
-				if !registrationMGConfig.IsZero() {
-					resolvedCfg["mesh_gateway"] = registrationMGConfig
+
+				// The MeshGateway value from the proxy registration overrides the one from upstream_defaults
+				// because it is specific to the proxy instance.
+				//
+				// The goal is to flatten the mesh gateway mode in this order:
+				// 	0. Value from centralized upstream_defaults
+				// 	1. Value from local proxy registration
+				// 	2. Value from centralized upstream_configs
+				// 	3. Value from local upstream definition. This last step is done in the client's service manager.
+				if !args.MeshGateway.IsZero() {
+					resolvedCfg["mesh_gateway"] = args.MeshGateway
 				}
 
 				if upstreamConfigs[upstream.String()] != nil {

agent/consul/config_endpoint_test.go

@@ -930,8 +930,6 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams(t *testing.T) {
 			},
 			request: structs.ServiceConfigRequest{
 				Name:       "foo",
-				ID:         "foo-proxy-1",
-				NodeName:   "foo-node",
 				Datacenter: "dc1",
 				Upstreams:  []string{"zap"},
 			},
@@ -973,8 +971,6 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams(t *testing.T) {
 			},
 			request: structs.ServiceConfigRequest{
 				Name:        "foo",
-				ID:          "foo-proxy-1",
-				NodeName:    "foo-node",
 				Datacenter:  "dc1",
 				UpstreamIDs: []structs.ServiceID{{ID: "zap"}},
 			},
@@ -1019,17 +1015,13 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams(t *testing.T) {
 			},
 			request: structs.ServiceConfigRequest{
 				Name:       "foo",
-				ID:         "foo-proxy-1",
-				NodeName:   "foo-node",
 				Datacenter: "dc1",
-				UpstreamIDs: []structs.ServiceID{
-					{ID: "zap"},
-				},
-			},
-			proxyCfg: structs.ConnectProxyConfig{
 				MeshGateway: structs.MeshGatewayConfig{
 					Mode: structs.MeshGatewayModeNone,
 				},
+				UpstreamIDs: []structs.ServiceID{
+					{ID: "zap"},
+				},
 			},
 			expect: structs.ServiceConfigResponse{
 				UpstreamIDConfigs: structs.OpaqueUpstreamConfigs{
@@ -1085,17 +1077,13 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams(t *testing.T) {
 			},
 			request: structs.ServiceConfigRequest{
 				Name:       "foo",
-				ID:         "foo-proxy-1",
-				NodeName:   "foo-node",
 				Datacenter: "dc1",
-				UpstreamIDs: []structs.ServiceID{
-					{ID: "zap"},
-				},
-			},
-			proxyCfg: structs.ConnectProxyConfig{
 				MeshGateway: structs.MeshGatewayConfig{
 					Mode: structs.MeshGatewayModeNone,
 				},
+				UpstreamIDs: []structs.ServiceID{
+					{ID: "zap"},
+				},
 			},
 			expect: structs.ServiceConfigResponse{
 				ProxyConfig: map[string]interface{}{
@@ -1141,19 +1129,6 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams(t *testing.T) {
 				idx++
 			}
 
-			// The config endpoints pulls the proxy registration if a proxy ID is provided.
-			if tc.request.ID != "" {
-				require.NoError(t, state.EnsureNode(4, &structs.Node{
-					ID:   "9c6e733c-c39d-4555-8d41-0f174a31c489",
-					Node: tc.request.NodeName,
-				}))
-				require.NoError(t, state.EnsureService(5, tc.request.NodeName, &structs.NodeService{
-					ID:      tc.request.ID,
-					Service: tc.request.ID,
-					Proxy:   tc.proxyCfg,
-				}))
-			}
-
 			var out structs.ServiceConfigResponse
 			require.NoError(t, msgpackrpc.CallWithCodec(codec, "ConfigEntry.ResolveServiceConfig", &tc.request, &out))
 
@@ -1213,8 +1188,6 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams_RegistrationBlocking(t *test
 
 	args := structs.ServiceConfigRequest{
 		Name:       "foo",
-		ID:         "foo-proxy",
-		NodeName:   nodeName,
 		Datacenter: s1.config.Datacenter,
 		Upstreams:  []string{"bar", "baz"},
 	}
@@ -1263,8 +1236,6 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams_RegistrationBlocking(t *test
 		require.NoError(t, msgpackrpc.CallWithCodec(codec, "ConfigEntry.ResolveServiceConfig",
 			&structs.ServiceConfigRequest{
 				Name:       "foo",
-				ID:         "foo-proxy",
-				NodeName:   nodeName,
 				Datacenter: "dc1",
 				Upstreams:  []string{"bar", "baz"},
 				QueryOptions: structs.QueryOptions{
@@ -1343,7 +1314,8 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams_DegistrationBlocking(t *test
 		ID:   "9c6e733c-c39d-4555-8d41-0f174a31c489",
 		Node: nodeName,
 	}))
-	require.NoError(t, state.EnsureService(5, nodeName, &structs.NodeService{
+
+	registration := structs.NodeService{
 		ID:      "foo-proxy",
 		Service: "foo-proxy",
 		Proxy: structs.ConnectProxyConfig{
@@ -1351,13 +1323,13 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams_DegistrationBlocking(t *test
 				Mode: structs.MeshGatewayModeLocal,
 			},
 		},
-	}))
+	}
+	require.NoError(t, state.EnsureService(5, nodeName, &registration))
 
 	args := structs.ServiceConfigRequest{
 		Name:        "foo",
-		ID:         "foo-proxy",
-		NodeName:   nodeName,
 		Datacenter:  s1.config.Datacenter,
+		MeshGateway: registration.Proxy.MeshGateway,
 		Upstreams:   []string{"bar", "baz"},
 	}
 	var out structs.ServiceConfigResponse
@@ -1401,9 +1373,8 @@ func TestConfigEntry_ResolveServiceConfig_Upstreams_DegistrationBlocking(t *test
 		require.NoError(t, msgpackrpc.CallWithCodec(codec, "ConfigEntry.ResolveServiceConfig",
 			&structs.ServiceConfigRequest{
 				Name:        "foo",
-				ID:         "foo-proxy",
-				NodeName:   nodeName,
 				Datacenter:  "dc1",
+				MeshGateway: registration.Proxy.MeshGateway,
 				Upstreams:   []string{"bar", "baz"},
 				QueryOptions: structs.QueryOptions{
 					MinQueryIndex: index,

agent/structs/config_entry.go

@@ -578,10 +578,11 @@ func (r *ConfigEntryListAllRequest) RequestDatacenter() string {
 // for a service.
 type ServiceConfigRequest struct {
 	Name       string
-	ID         string
-	NodeName   string
 	Datacenter string
 
+	// MeshGateway contains the mesh gateway configuration from the requesting proxy's registration
+	MeshGateway MeshGatewayConfig
+
 	UpstreamIDs []ServiceID
 
 	// DEPRECATED