Merge pull request #576 from milosgajdos83/router-rpc

Added List and Watch rpc calls.

network/router/default.go

@@ -95,7 +95,7 @@ func (r *router) manageServiceRoutes(service *registry.Service, action string) e
 		}
 		switch action {
 		case "insert", "create":
-			if err := r.opts.Table.Add(route); err != nil && err != table.ErrDuplicateRoute {
+			if err := r.opts.Table.Create(route); err != nil && err != table.ErrDuplicateRoute {
 				return fmt.Errorf("failed adding route for service %s: %s", service.Name, err)
 			}
 		case "delete":
@@ -227,7 +227,7 @@ func isFlapping(curr, prev *table.Event) bool {
 		return true
 	}
 
-	if curr.Type == table.Insert && prev.Type == table.Delete || curr.Type == table.Delete && prev.Type == table.Insert {
+	if curr.Type == table.Create && prev.Type == table.Delete || curr.Type == table.Delete && prev.Type == table.Create {
 		return true
 	}
 
@@ -389,7 +389,7 @@ func (r *router) Advertise() (<-chan *Advert, error) {
 		events := make([]*table.Event, len(routes))
 		for i, route := range routes {
 			event := &table.Event{
-				Type:      table.Insert,
+				Type:      table.Create,
 				Timestamp: time.Now(),
 				Route:     route,
 			}
@@ -406,7 +406,7 @@ func (r *router) Advertise() (<-chan *Advert, error) {
 				Network: "*",
 				Metric:  table.DefaultLocalMetric,
 			}
-			if err := r.opts.Table.Add(route); err != nil {
+			if err := r.opts.Table.Create(route); err != nil {
 				return nil, fmt.Errorf("failed adding default gateway route: %s", err)
 			}
 		}

network/router/proto/router.micro.go

@@ -34,7 +34,9 @@ var _ server.Option
 // Client API for Router service
 
 type RouterService interface {
+	Watch(ctx context.Context, in *WatchRequest, opts ...client.CallOption) (Router_WatchService, error)
 	Lookup(ctx context.Context, in *LookupRequest, opts ...client.CallOption) (*LookupResponse, error)
+	List(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error)
 }
 
 type routerService struct {
@@ -55,6 +57,50 @@ func NewRouterService(name string, c client.Client) RouterService {
 	}
 }
 
+func (c *routerService) Watch(ctx context.Context, in *WatchRequest, opts ...client.CallOption) (Router_WatchService, error) {
+	req := c.c.NewRequest(c.name, "Router.Watch", &WatchRequest{})
+	stream, err := c.c.Stream(ctx, req, opts...)
+	if err != nil {
+		return nil, err
+	}
+	if err := stream.Send(in); err != nil {
+		return nil, err
+	}
+	return &routerServiceWatch{stream}, nil
+}
+
+type Router_WatchService interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Recv() (*TableEvent, error)
+}
+
+type routerServiceWatch struct {
+	stream client.Stream
+}
+
+func (x *routerServiceWatch) Close() error {
+	return x.stream.Close()
+}
+
+func (x *routerServiceWatch) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *routerServiceWatch) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *routerServiceWatch) Recv() (*TableEvent, error) {
+	m := new(TableEvent)
+	err := x.stream.Recv(m)
+	if err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 func (c *routerService) Lookup(ctx context.Context, in *LookupRequest, opts ...client.CallOption) (*LookupResponse, error) {
 	req := c.c.NewRequest(c.name, "Router.Lookup", in)
 	out := new(LookupResponse)
@@ -65,15 +111,29 @@ func (c *routerService) Lookup(ctx context.Context, in *LookupRequest, opts ...c
 	return out, nil
 }
 
+func (c *routerService) List(ctx context.Context, in *ListRequest, opts ...client.CallOption) (*ListResponse, error) {
+	req := c.c.NewRequest(c.name, "Router.List", in)
+	out := new(ListResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Router service
 
 type RouterHandler interface {
+	Watch(context.Context, *WatchRequest, Router_WatchStream) error
 	Lookup(context.Context, *LookupRequest, *LookupResponse) error
+	List(context.Context, *ListRequest, *ListResponse) error
 }
 
 func RegisterRouterHandler(s server.Server, hdlr RouterHandler, opts ...server.HandlerOption) error {
 	type router interface {
+		Watch(ctx context.Context, stream server.Stream) error
 		Lookup(ctx context.Context, in *LookupRequest, out *LookupResponse) error
+		List(ctx context.Context, in *ListRequest, out *ListResponse) error
 	}
 	type Router struct {
 		router
@@ -86,6 +146,45 @@ type routerHandler struct {
 	RouterHandler
 }
 
+func (h *routerHandler) Watch(ctx context.Context, stream server.Stream) error {
+	m := new(WatchRequest)
+	if err := stream.Recv(m); err != nil {
+		return err
+	}
+	return h.RouterHandler.Watch(ctx, m, &routerWatchStream{stream})
+}
+
+type Router_WatchStream interface {
+	SendMsg(interface{}) error
+	RecvMsg(interface{}) error
+	Close() error
+	Send(*TableEvent) error
+}
+
+type routerWatchStream struct {
+	stream server.Stream
+}
+
+func (x *routerWatchStream) Close() error {
+	return x.stream.Close()
+}
+
+func (x *routerWatchStream) SendMsg(m interface{}) error {
+	return x.stream.Send(m)
+}
+
+func (x *routerWatchStream) RecvMsg(m interface{}) error {
+	return x.stream.Recv(m)
+}
+
+func (x *routerWatchStream) Send(m *TableEvent) error {
+	return x.stream.Send(m)
+}
+
 func (h *routerHandler) Lookup(ctx context.Context, in *LookupRequest, out *LookupResponse) error {
 	return h.RouterHandler.Lookup(ctx, in, out)
 }
+
+func (h *routerHandler) List(ctx context.Context, in *ListRequest, out *ListResponse) error {
+	return h.RouterHandler.List(ctx, in, out)
+}

network/router/proto/router.pb.go

@@ -20,6 +20,35 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
+// EventType is TableEvent type
+type EventType int32
+
+const (
+	EventType_Insert EventType = 0
+	EventType_Delete EventType = 1
+	EventType_Update EventType = 2
+)
+
+var EventType_name = map[int32]string{
+	0: "Insert",
+	1: "Delete",
+	2: "Update",
+}
+
+var EventType_value = map[string]int32{
+	"Insert": 0,
+	"Delete": 1,
+	"Update": 2,
+}
+
+func (x EventType) String() string {
+	return proto.EnumName(EventType_name, int32(x))
+}
+
+func (EventType) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_367072455c71aedc, []int{0}
+}
+
 // LookupRequest is made to Lookup
 type LookupRequest struct {
 	Query                *Query   `protobuf:"bytes,1,opt,name=query,proto3" json:"query,omitempty"`
@@ -60,7 +89,7 @@ func (m *LookupRequest) GetQuery() *Query {
 	return nil
 }
 
-// LookupResponse is returns by Lookup
+// LookupResponse is returned by Lookup
 type LookupResponse struct {
 	Routes               []*Route `protobuf:"bytes,1,rep,name=routes,proto3" json:"routes,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -100,6 +129,169 @@ func (m *LookupResponse) GetRoutes() []*Route {
 	return nil
 }
 
+// WatchRequest is made to Watch Router
+type WatchRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *WatchRequest) Reset()         { *m = WatchRequest{} }
+func (m *WatchRequest) String() string { return proto.CompactTextString(m) }
+func (*WatchRequest) ProtoMessage()    {}
+func (*WatchRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_367072455c71aedc, []int{2}
+}
+
+func (m *WatchRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_WatchRequest.Unmarshal(m, b)
+}
+func (m *WatchRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_WatchRequest.Marshal(b, m, deterministic)
+}
+func (m *WatchRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_WatchRequest.Merge(m, src)
+}
+func (m *WatchRequest) XXX_Size() int {
+	return xxx_messageInfo_WatchRequest.Size(m)
+}
+func (m *WatchRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_WatchRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_WatchRequest proto.InternalMessageInfo
+
+// TableEvent is streamed by WatchRequest
+type TableEvent struct {
+	// time of table event
+	Type EventType `protobuf:"varint,1,opt,name=type,proto3,enum=EventType" json:"type,omitempty"`
+	// unix timestamp of event
+	Timestamp int64 `protobuf:"varint,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	// service route
+	Route                *Route   `protobuf:"bytes,3,opt,name=route,proto3" json:"route,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *TableEvent) Reset()         { *m = TableEvent{} }
+func (m *TableEvent) String() string { return proto.CompactTextString(m) }
+func (*TableEvent) ProtoMessage()    {}
+func (*TableEvent) Descriptor() ([]byte, []int) {
+	return fileDescriptor_367072455c71aedc, []int{3}
+}
+
+func (m *TableEvent) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_TableEvent.Unmarshal(m, b)
+}
+func (m *TableEvent) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_TableEvent.Marshal(b, m, deterministic)
+}
+func (m *TableEvent) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TableEvent.Merge(m, src)
+}
+func (m *TableEvent) XXX_Size() int {
+	return xxx_messageInfo_TableEvent.Size(m)
+}
+func (m *TableEvent) XXX_DiscardUnknown() {
+	xxx_messageInfo_TableEvent.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TableEvent proto.InternalMessageInfo
+
+func (m *TableEvent) GetType() EventType {
+	if m != nil {
+		return m.Type
+	}
+	return EventType_Insert
+}
+
+func (m *TableEvent) GetTimestamp() int64 {
+	if m != nil {
+		return m.Timestamp
+	}
+	return 0
+}
+
+func (m *TableEvent) GetRoute() *Route {
+	if m != nil {
+		return m.Route
+	}
+	return nil
+}
+
+// ListRequest is made to List routes
+type ListRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ListRequest) Reset()         { *m = ListRequest{} }
+func (m *ListRequest) String() string { return proto.CompactTextString(m) }
+func (*ListRequest) ProtoMessage()    {}
+func (*ListRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_367072455c71aedc, []int{4}
+}
+
+func (m *ListRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListRequest.Unmarshal(m, b)
+}
+func (m *ListRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListRequest.Marshal(b, m, deterministic)
+}
+func (m *ListRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListRequest.Merge(m, src)
+}
+func (m *ListRequest) XXX_Size() int {
+	return xxx_messageInfo_ListRequest.Size(m)
+}
+func (m *ListRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListRequest proto.InternalMessageInfo
+
+// ListResponse is returned by List
+type ListResponse struct {
+	Routes               []*Route `protobuf:"bytes,1,rep,name=routes,proto3" json:"routes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ListResponse) Reset()         { *m = ListResponse{} }
+func (m *ListResponse) String() string { return proto.CompactTextString(m) }
+func (*ListResponse) ProtoMessage()    {}
+func (*ListResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_367072455c71aedc, []int{5}
+}
+
+func (m *ListResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListResponse.Unmarshal(m, b)
+}
+func (m *ListResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListResponse.Marshal(b, m, deterministic)
+}
+func (m *ListResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListResponse.Merge(m, src)
+}
+func (m *ListResponse) XXX_Size() int {
+	return xxx_messageInfo_ListResponse.Size(m)
+}
+func (m *ListResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListResponse proto.InternalMessageInfo
+
+func (m *ListResponse) GetRoutes() []*Route {
+	if m != nil {
+		return m.Routes
+	}
+	return nil
+}
+
 // Query is passed in a LookupRequest
 type Query struct {
 	// service to lookup
@@ -113,7 +305,7 @@ func (m *Query) Reset()         { *m = Query{} }
 func (m *Query) String() string { return proto.CompactTextString(m) }
 func (*Query) ProtoMessage()    {}
 func (*Query) Descriptor() ([]byte, []int) {
-	return fileDescriptor_367072455c71aedc, []int{2}
+	return fileDescriptor_367072455c71aedc, []int{6}
 }
 
 func (m *Query) XXX_Unmarshal(b []byte) error {
@@ -164,7 +356,7 @@ func (m *Route) Reset()         { *m = Route{} }
 func (m *Route) String() string { return proto.CompactTextString(m) }
 func (*Route) ProtoMessage()    {}
 func (*Route) Descriptor() ([]byte, []int) {
-	return fileDescriptor_367072455c71aedc, []int{3}
+	return fileDescriptor_367072455c71aedc, []int{7}
 }
 
 func (m *Route) XXX_Unmarshal(b []byte) error {
@@ -228,8 +420,13 @@ func (m *Route) GetMetric() int64 {
 }
 
 func init() {
+	proto.RegisterEnum("EventType", EventType_name, EventType_value)
 	proto.RegisterType((*LookupRequest)(nil), "LookupRequest")
 	proto.RegisterType((*LookupResponse)(nil), "LookupResponse")
+	proto.RegisterType((*WatchRequest)(nil), "WatchRequest")
+	proto.RegisterType((*TableEvent)(nil), "TableEvent")
+	proto.RegisterType((*ListRequest)(nil), "ListRequest")
+	proto.RegisterType((*ListResponse)(nil), "ListResponse")
 	proto.RegisterType((*Query)(nil), "Query")
 	proto.RegisterType((*Route)(nil), "Route")
 }
@@ -237,20 +434,30 @@ func init() {
 func init() { proto.RegisterFile("router.proto", fileDescriptor_367072455c71aedc) }
 
 var fileDescriptor_367072455c71aedc = []byte{
-	// 238 bytes of a gzipped FileDescriptorProto
+	// 390 bytes of a gzipped FileDescriptorProto
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+	0x36, 0xbe, 0x51, 0x1f, 0x20, 0xbf, 0x6d, 0x9a, 0x5d, 0xd7, 0x1a, 0x7c, 0xec, 0xd0, 0x79, 0x71,
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-	0xe5, 0x2f, 0x00, 0x00, 0xff, 0xff, 0xd3, 0x99, 0xfb, 0x2d, 0x6f, 0x01, 0x00, 0x00,
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+	0x4f, 0x7d, 0x51, 0xd1, 0x3d, 0xa7, 0x68, 0x7e, 0xfa, 0x13, 0x00, 0x00, 0xff, 0xff, 0x7e, 0xbb,
+	0x6d, 0x5c, 0xaa, 0x02, 0x00, 0x00,
 }

network/router/proto/router.proto

@@ -2,7 +2,9 @@ syntax = "proto3";
 
 // Router service is used by the proxy to lookup routes
 service Router {
+        rpc Watch(WatchRequest) returns (stream TableEvent) {};
 	rpc Lookup(LookupRequest) returns (LookupResponse) {};
+        rpc List(ListRequest) returns (ListResponse) {};
 }
 
 // LookupRequest is made to Lookup
@@ -10,11 +12,39 @@ message LookupRequest {
 	Query query = 1;
 }
 
-// LookupResponse is returns by Lookup
+// LookupResponse is returned by Lookup
 message LookupResponse {
 	repeated Route routes = 1;
 }
 
+// WatchRequest is made to Watch Router
+message WatchRequest {}
+
+// EventType is TableEvent type
+enum EventType {
+        Insert = 0;
+        Delete = 1;
+        Update = 2;
+}
+
+// TableEvent is streamed by WatchRequest
+message TableEvent {
+        // time of table event
+        EventType type = 1;
+        // unix timestamp of event
+        int64 timestamp = 2;
+        // service route
+	Route route = 3;
+}
+
+// ListRequest is made to List routes
+message ListRequest {}
+
+// ListResponse is returned by List
+message ListResponse {
+	repeated Route routes = 1;
+}
+
 // Query is passed in a LookupRequest
 message Query {
 	// service to lookup

network/router/table/default.go

@@ -2,6 +2,7 @@ package table
 
 import (
 	"sync"
+	"time"
 
 	"github.com/google/uuid"
 )
@@ -51,8 +52,8 @@ func (t *table) Options() TableOptions {
 	return t.opts
 }
 
-// Add adds a route to the routing table
+// Create creates new route in the routing table
-func (t *table) Add(r Route) error {
+func (t *table) Create(r Route) error {
 	service := r.Service
 	sum := r.Hash()
 
@@ -63,14 +64,14 @@ func (t *table) Add(r Route) error {
 	if _, ok := t.m[service]; !ok {
 		t.m[service] = make(map[uint64]Route)
 		t.m[service][sum] = r
-		go t.sendEvent(&Event{Type: Insert, Route: r})
+		go t.sendEvent(&Event{Type: Create, Timestamp: time.Now(), Route: r})
 		return nil
 	}
 
 	// add new route to the table for the route destination
 	if _, ok := t.m[service][sum]; !ok {
 		t.m[service][sum] = r
-		go t.sendEvent(&Event{Type: Insert, Route: r})
+		go t.sendEvent(&Event{Type: Create, Timestamp: time.Now(), Route: r})
 		return nil
 	}
 
@@ -90,7 +91,7 @@ func (t *table) Delete(r Route) error {
 	}
 
 	delete(t.m[service], sum)
-	go t.sendEvent(&Event{Type: Delete, Route: r})
+	go t.sendEvent(&Event{Type: Delete, Timestamp: time.Now(), Route: r})
 
 	return nil
 }
@@ -111,7 +112,7 @@ func (t *table) Update(r Route) error {
 	// if the route has been found update it
 	if _, ok := t.m[service][sum]; ok {
 		t.m[service][sum] = r
-		go t.sendEvent(&Event{Type: Update, Route: r})
+		go t.sendEvent(&Event{Type: Update, Timestamp: time.Now(), Route: r})
 		return nil
 	}
 

network/router/table/default_test.go

@@ -16,11 +16,11 @@ func testSetup() (Table, Route) {
 	return table, route
 }
 
-func TestAdd(t *testing.T) {
+func TestCreate(t *testing.T) {
 	table, route := testSetup()
 	testTableSize := table.Size()
 
-	if err := table.Add(route); err != nil {
+	if err := table.Create(route); err != nil {
 		t.Errorf("error adding route: %s", err)
 	}
 	testTableSize += 1
@@ -28,7 +28,7 @@ func TestAdd(t *testing.T) {
 	// adds new route for the original destination
 	route.Gateway = "dest.gw2"
 
-	if err := table.Add(route); err != nil {
+	if err := table.Create(route); err != nil {
 		t.Errorf("error adding route: %s", err)
 	}
 	testTableSize += 1
@@ -38,7 +38,7 @@ func TestAdd(t *testing.T) {
 	}
 
 	// adding the same route under Insert policy must error
-	if err := table.Add(route); err != ErrDuplicateRoute {
+	if err := table.Create(route); err != ErrDuplicateRoute {
 		t.Errorf("error adding route. Expected error: %s, found: %s", ErrDuplicateRoute, err)
 	}
 }
@@ -47,7 +47,7 @@ func TestDelete(t *testing.T) {
 	table, route := testSetup()
 	testTableSize := table.Size()
 
-	if err := table.Add(route); err != nil {
+	if err := table.Create(route); err != nil {
 		t.Errorf("error adding route: %s", err)
 	}
 	testTableSize += 1
@@ -77,7 +77,7 @@ func TestUpdate(t *testing.T) {
 	table, route := testSetup()
 	testTableSize := table.Size()
 
-	if err := table.Add(route); err != nil {
+	if err := table.Create(route); err != nil {
 		t.Errorf("error adding route: %s", err)
 	}
 	testTableSize += 1
@@ -113,7 +113,7 @@ func TestList(t *testing.T) {
 
 	for i := 0; i < len(svc); i++ {
 		route.Service = svc[i]
-		if err := table.Add(route); err != nil {
+		if err := table.Create(route); err != nil {
 			t.Errorf("error adding route: %s", err)
 		}
 	}
@@ -143,7 +143,7 @@ func TestLookup(t *testing.T) {
 		route.Service = svc[i]
 		route.Network = net[i]
 		route.Gateway = gw[i]
-		if err := table.Add(route); err != nil {
+		if err := table.Create(route); err != nil {
 			t.Errorf("error adding route: %s", err)
 		}
 	}

network/router/table/table.go

@@ -13,8 +13,8 @@ var (
 
 // Table defines routing table interface
 type Table interface {
-	// Add adds new route to the routing table
+	// Create new route in the routing table
-	Add(Route) error
+	Create(Route) error
 	// Delete deletes existing route from the routing table
 	Delete(Route) error
 	// Update updates route in the routing table

network/router/table/watcher.go

@@ -2,7 +2,6 @@ package table
 
 import (
 	"errors"
-	"fmt"
 	"time"
 )
 
@@ -15,28 +14,14 @@ var (
 type EventType int
 
 const (
-	// Insert is emitted when a new route has been inserted
+	// Create is emitted when a new route has been created
-	Insert EventType = iota
+	Create EventType = iota
 	// Delete is emitted when an existing route has been deleted
 	Delete
 	// Update is emitted when an existing route has been updated
 	Update
 )
 
-// String returns string representation of the event
-func (et EventType) String() string {
-	switch et {
-	case Insert:
-		return "INSERT"
-	case Delete:
-		return "DELETE"
-	case Update:
-		return "UPDATE"
-	default:
-		return "UNKNOWN"
-	}
-}
-
 // Event is returned by a call to Next on the watcher.
 type Event struct {
 	// Type defines type of event
@@ -47,11 +32,6 @@ type Event struct {
 	Route Route
 }
 
-// String prints human readable Event
-func (e Event) String() string {
-	return fmt.Sprintf("[EVENT] time: %s type: %s", e.Timestamp, e.Type)
-}
-
 // WatchOption is used to define what routes to watch in the table
 type WatchOption func(*WatchOptions)
 
@@ -88,7 +68,7 @@ type tableWatcher struct {
 
 // Next returns the next noticed action taken on table
 // TODO: this needs to be thought through properly;
-// right now we only allow to watch destination
+// right now we only allow to watch service
 func (w *tableWatcher) Next() (*Event, error) {
 	for {
 		select {