connect: enable setting tags on consul connect sidecar service in jobspec (#6415)

api/services.go

@@ -143,6 +143,7 @@ type ConsulConnect struct {
 // ConsulSidecarService represents a Consul Connect SidecarService jobspec
 // stanza.
 type ConsulSidecarService struct {
+	Tags  []string
 	Port  string
 	Proxy *ConsulProxy
 }

command/agent/consul/client.go

@@ -1473,6 +1473,7 @@ func newConnect(serviceName string, nc *structs.ConsulConnect, networks structs.
 
 	// Advertise host IP:port
 	cc.SidecarService = &api.AgentServiceRegistration{
+		Tags:    helper.CopySliceString(nc.SidecarService.Tags),
 		Address: net.IP,
 		Port:    port.Value,
 

command/agent/job_endpoint.go

@@ -1062,6 +1062,7 @@ func ApiConsulConnectToStructs(in *api.ConsulConnect) *structs.ConsulConnect {
 	if in.SidecarService != nil {
 
 		out.SidecarService = &structs.ConsulSidecarService{
+			Tags: helper.CopySliceString(in.SidecarService.Tags),
 			Port: in.SidecarService.Port,
 		}
 

command/agent/job_endpoint_test.go

@@ -1537,6 +1537,13 @@ func TestJobs_ApiJobToStructsJob(t *testing.T) {
 								TaskName: "task1",
 							},
 						},
+						Connect: &api.ConsulConnect{
+							Native: false,
+							SidecarService: &api.ConsulSidecarService{
+								Tags: []string{"f", "g"},
+								Port: "9000",
+							},
+						},
 					},
 				},
 				Tasks: []*api.Task{
@@ -1877,6 +1884,13 @@ func TestJobs_ApiJobToStructsJob(t *testing.T) {
 								TaskName: "task1",
 							},
 						},
+						Connect: &structs.ConsulConnect{
+							Native: false,
+							SidecarService: &structs.ConsulSidecarService{
+								Tags: []string{"f", "g"},
+								Port: "9000",
+							},
+						},
 					},
 				},
 				Tasks: []*structs.Task{

jobspec/parse_service.go

@@ -193,6 +193,7 @@ func parseSidecarService(o *ast.ObjectItem) (*api.ConsulSidecarService, error) {
 	valid := []string{
 		"port",
 		"proxy",
+		"tags",
 	}
 
 	if err := helper.CheckHCLKeys(o.Val, valid); err != nil {
@@ -216,7 +217,7 @@ func parseSidecarService(o *ast.ObjectItem) (*api.ConsulSidecarService, error) {
 		return nil, err
 	}
 	if err := dec.Decode(m); err != nil {
-		return nil, fmt.Errorf("foo: %v", err)
+		return nil, fmt.Errorf("sidecar_service: %v", err)
 	}
 
 	var proxyList *ast.ObjectList

jobspec/parse_test.go

@@ -943,6 +943,7 @@ func TestParse(t *testing.T) {
 								PortLabel:  "1234",
 								Connect: &api.ConsulConnect{
 									SidecarService: &api.ConsulSidecarService{
+										Tags: []string{"side1", "side2"},
 										Proxy: &api.ConsulProxy{
 											Upstreams: []*api.ConsulUpstream{
 												{

jobspec/test-fixtures/tg-network.hcl

@@ -21,6 +21,7 @@ job "foo" {
 
       connect {
         sidecar_service {
+          tags = ["side1", "side2"]
           proxy {
             local_service_port = 8080
 

nomad/structs/services.go

@@ -597,6 +597,10 @@ func (c *ConsulConnect) Validate() error {
 // ConsulSidecarService represents a Consul Connect SidecarService jobspec
 // stanza.
 type ConsulSidecarService struct {
+	// Tags are optional service tags that get registered with the sidecar service
+	// in Consul. If unset, the sidecar service inherits the parent service tags.
+	Tags []string
+
 	// Port is the service's port that the sidecar will connect to. May be
 	// a port label or a literal port number.
 	Port string
@@ -613,6 +617,7 @@ func (s *ConsulSidecarService) HasUpstreams() bool {
 // Copy the stanza recursively. Returns nil if nil.
 func (s *ConsulSidecarService) Copy() *ConsulSidecarService {
 	return &ConsulSidecarService{
+		Tags:  helper.CopySliceString(s.Tags),
 		Port:  s.Port,
 		Proxy: s.Proxy.Copy(),
 	}

nomad/structs/services_test.go

@@ -34,6 +34,7 @@ func TestConsulConnect_CopyEquals(t *testing.T) {
 
 	c := &ConsulConnect{
 		SidecarService: &ConsulSidecarService{
+			Tags: []string{"tag1", "tag2"},
 			Port: "9001",
 			Proxy: &ConsulProxy{
 				LocalServiceAddress: "127.0.0.1",