Sets up config for more address tags down the road, renames struct members.

command/agent/agent.go

@@ -161,6 +161,11 @@ func Create(config *Config, logOutput io.Writer) (*Agent, error) {
 		config.AdvertiseAddrWan = config.AdvertiseAddr
 	}
 
+	// Create the default set of tagged addresses.
+	config.TaggedAddresses = map[string]string{
+		"wan": config.AdvertiseAddrWan,
+	}
+
 	agent := &Agent{
 		config:        config,
 		logger:        log.New(logOutput, "", log.LstdFlags),
@@ -287,7 +292,6 @@ func (a *Agent) consulConfig() *consul.Config {
 	if a.config.AdvertiseAddrs.SerfWan != nil {
 		base.SerfWANConfig.MemberlistConfig.AdvertiseAddr = a.config.AdvertiseAddrs.SerfWan.IP.String()
 		base.SerfWANConfig.MemberlistConfig.AdvertisePort = a.config.AdvertiseAddrs.SerfWan.Port
-		a.config.AdvertiseAddrWan = a.config.AdvertiseAddrs.SerfWan.IP.String()
 	}
 	if a.config.AdvertiseAddrs.RPC != nil {
 		base.RPCAdvertise = a.config.AdvertiseAddrs.RPC

command/agent/agent_test.go

@@ -168,9 +168,11 @@ func TestAgent_CheckAdvertiseAddrsSettings(t *testing.T) {
 	if rpc != c.AdvertiseAddrs.RPC {
 		t.Fatalf("RPC is not properly set to %v: %s", c.AdvertiseAddrs.RPC, rpc)
 	}
-	advertiseWanAddress := agent.config.AdvertiseAddrWan
-	if serfWanAddr != advertiseWanAddress {
-		t.Fatalf("AdvertiseAddrWan is not properly set to '%s': %s", serfWanAddr, advertiseWanAddress)
+	expected := map[string]string{
+		"wan": agent.config.AdvertiseAddrWan,
+	}
+	if !reflect.DeepEqual(agent.config.TaggedAddresses, expected) {
+		t.Fatalf("Tagged addresses not set up properly: %v", agent.config.TaggedAddresses)
 	}
 }
 

command/agent/config.go

@@ -190,7 +190,8 @@ type Config struct {
 	AdvertiseAddrWan string `mapstructure:"advertise_addr_wan"`
 
 	// TranslateWanAddrs controls whether or not Consul should prefer
-	// the AdvertiseAddrWan address when doing lookups in remote datacenters.
+	// the "wan" tagged address when doing lookups in remote datacenters.
+	// See TaggedAddresses below for more details.
 	TranslateWanAddrs bool `mapstructure:"translate_wan_addrs"`
 
 	// Port configurations
@@ -199,6 +200,14 @@ type Config struct {
 	// Address configurations
 	Addresses AddressConfig
 
+	// Tagged addresses. These are used to publish a set of addresses for
+	// for a node, which can be used by the remote agent. We currently
+	// populate only the "wan" tag based on the SerfWan advertise address,
+	// but this structure is here for possible future features with other
+	// user-defined tags. The "wan" tag will be used by remote agents if
+	// they are configured with TranslateWanAddrs set to true.
+	TaggedAddresses map[string]string
+
 	// LeaveOnTerm controls if Serf does a graceful leave when receiving
 	// the TERM signal. Defaults false. This can be changed on reload.
 	LeaveOnTerm bool `mapstructure:"leave_on_terminate"`

command/agent/dns.go

@@ -405,7 +405,7 @@ RPC:
 	// Determine whether we should use the WAN address or not
 	addr := out.NodeServices.Node.Address
 	if d.agent.config.TranslateWanAddrs && datacenter != d.agent.config.Datacenter {
-		addr = out.NodeServices.Node.Addresses["wan"]
+		addr = out.NodeServices.Node.TaggedAddresses["wan"]
 	}
 
 	// Add the node record
@@ -674,8 +674,8 @@ func (d *DNSServer) serviceNodeRecords(nodes structs.CheckServiceNodes, req, res
 		addr := node.Node.Address
 		if node.Service.Address != "" {
 			addr = node.Service.Address
-		} else if useWan == true && node.Node.Addresses["wan"] != "" {
-			addr = node.Node.Addresses["wan"]
+		} else if useWan == true && node.Node.TaggedAddresses["wan"] != "" {
+			addr = node.Node.TaggedAddresses["wan"]
 		}
 
 		// Avoid duplicate entries, possible if a node has
@@ -724,8 +724,8 @@ func (d *DNSServer) serviceSRVRecords(dc string, nodes structs.CheckServiceNodes
 		addr := node.Node.Address
 		if node.Service.Address != "" {
 			addr = node.Service.Address
-		} else if useWan == true && node.Node.Addresses["wan"] != "" {
-			addr = node.Node.Addresses["wan"]
+		} else if useWan == true && node.Node.TaggedAddresses["wan"] != "" {
+			addr = node.Node.TaggedAddresses["wan"]
 		}
 
 		// Add the extra record

command/agent/dns_test.go

@@ -117,7 +117,7 @@ func TestDNS_NodeLookup(t *testing.T) {
 		Datacenter: "dc1",
 		Node:       "foo",
 		Address:    "127.0.0.1",
-		Addresses: 	map[string]string {
+		TaggedAddresses: map[string]string{
 			"wan": "127.0.0.2",
 		},
 	}
@@ -758,7 +758,7 @@ func TestDNS_ServiceLookup_WanAddress(t *testing.T) {
 			Datacenter: "dc2",
 			Node:       "foo",
 			Address:    "127.0.0.1",
-			Addresses:  map[string]string {
+			TaggedAddresses: map[string]string{
 				"wan": "127.0.0.2",
 			},
 			Service: &structs.NodeService{

command/agent/local.go

@@ -526,9 +526,7 @@ func (l *localState) syncService(id string) error {
 		Datacenter:      l.config.Datacenter,
 		Node:            l.config.NodeName,
 		Address:         l.config.AdvertiseAddr,
-		Addresses:   	map[string]string {
-			"wan": l.config.AdvertiseAddrWan,
-		},
+		TaggedAddresses: l.config.TaggedAddresses,
 		Service:         l.services[id],
 		WriteRequest:    structs.WriteRequest{Token: l.serviceToken(id)},
 	}
@@ -586,9 +584,7 @@ func (l *localState) syncCheck(id string) error {
 		Datacenter:      l.config.Datacenter,
 		Node:            l.config.NodeName,
 		Address:         l.config.AdvertiseAddr,
-		Addresses:   	map[string]string {
-			"wan": l.config.AdvertiseAddrWan,
-		},
+		TaggedAddresses: l.config.TaggedAddresses,
 		Service:         service,
 		Check:           l.checks[id],
 		WriteRequest:    structs.WriteRequest{Token: l.checkToken(id)},

consul/fsm.go

@@ -474,9 +474,7 @@ func (s *consulSnapshot) persistNodes(sink raft.SnapshotSink,
 		req := structs.RegisterRequest{
 			Node:            n.Node,
 			Address:         n.Address,
-			Addresses:  map[string]string {
-				"wan": n.Addresses["wan"],
-			},
+			TaggedAddresses: n.TaggedAddresses,
 		}
 
 		// Register the node itself

consul/leader.go

@@ -381,7 +381,7 @@ func (s *Server) handleAliveMember(member serf.Member) error {
 	}
 	if node != nil && node.Address == member.Addr.String() {
 		// Check if the WAN address was updated
-		if node.Addresses["wan"] != member.Tags["wan_addr"] {
+		if node.TaggedAddresses["wan"] != member.Tags["wan_addr"] {
 			goto AFTER_CHECK
 		}
 
@@ -423,7 +423,7 @@ AFTER_CHECK:
 		Datacenter: s.config.Datacenter,
 		Node:       member.Name,
 		Address:    member.Addr.String(),
-		Addresses: 	map[string]string {
+		TaggedAddresses: map[string]string{
 			"wan": member.Tags["wan_addr"],
 		},
 		Service: service,
@@ -468,7 +468,7 @@ func (s *Server) handleFailedMember(member serf.Member) error {
 		Datacenter: s.config.Datacenter,
 		Node:       member.Name,
 		Address:    member.Addr.String(),
-		Addresses: 	map[string]string {
+		TaggedAddresses: map[string]string{
 			"wan": member.Tags["wan_addr"],
 		},
 		Check: &structs.HealthCheck{

consul/state/state_store.go

@@ -474,7 +474,11 @@ func (s *StateStore) EnsureRegistration(idx uint64, req *structs.RegisterRequest
 func (s *StateStore) ensureRegistrationTxn(tx *memdb.Txn, idx uint64, watches *DumbWatchManager,
 	req *structs.RegisterRequest) error {
 	// Add the node.
-	node := &structs.Node{Node: req.Node, Address: req.Address, Addresses: req.Addresses}
+	node := &structs.Node{
+		Node:            req.Node,
+		Address:         req.Address,
+		TaggedAddresses: req.TaggedAddresses,
+	}
 	if err := s.ensureNodeTxn(tx, idx, watches, node); err != nil {
 		return fmt.Errorf("failed inserting node: %s", err)
 	}
@@ -1375,7 +1379,7 @@ func (s *StateStore) parseNodes(tx *memdb.Txn, idx uint64,
 		dump := &structs.NodeInfo{
 			Node:            node.Node,
 			Address:         node.Address,
-			Addresses:  node.Addresses,
+			TaggedAddresses: node.TaggedAddresses,
 		}
 
 		// Query the node services

consul/structs/structs.go

@@ -162,7 +162,7 @@ type RegisterRequest struct {
 	Datacenter      string
 	Node            string
 	Address         string
-	Addresses  map[string]string
+	TaggedAddresses map[string]string
 	Service         *NodeService
 	Check           *HealthCheck
 	Checks          HealthChecks
@@ -248,7 +248,7 @@ func (r *ChecksInStateRequest) RequestDatacenter() string {
 type Node struct {
 	Node            string
 	Address         string
-	Addresses  map[string]string
+	TaggedAddresses map[string]string
 
 	RaftIndex
 }
@@ -442,7 +442,7 @@ OUTER:
 type NodeInfo struct {
 	Node            string
 	Address         string
-	Addresses  map[string]string
+	TaggedAddresses map[string]string
 	Services        []*NodeService
 	Checks          []*HealthCheck
 }