Merge pull request #736 from milosgajdos83/solicit-routes

Solicit routes when new node is discovered
2019-09-05 18:08:49 +01:00
parent 97b1071f7e dddfb6f878
commit 1d9298ae2b
7 changed files with 281 additions and 134 deletions
--- a/network/default.go
+++ b/network/default.go
@@ -2,6 +2,7 @@ package network

 import (
 	"container/list"
+	"errors"
 	"sync"
 	"time"

@@ -28,6 +29,13 @@ var (
 	DefaultLink = "network"
 )

+var (
+	// ErrMsgUnknown is returned when unknown message is attempted to send or receive
+	ErrMsgUnknown = errors.New("unknown message")
+	// ErrClientNotFound is returned when client for tunnel channel could not be found
+	ErrClientNotFound = errors.New("client not found")
+)
+
 // node is network node
 type node struct {
 	sync.RWMutex
@@ -275,12 +283,12 @@ func (n *network) acceptNetConn(l tunnel.Listener, recv chan *transport.Message)
 }

 // processNetChan processes messages received on NetworkChannel
-func (n *network) processNetChan(l tunnel.Listener) {
+func (n *network) processNetChan(client transport.Client, listener tunnel.Listener) {
 	// receive network message queue
 	recv := make(chan *transport.Message, 128)

 	// accept NetworkChannel connections
-	go n.acceptNetConn(l, recv)
+	go n.acceptNetConn(listener, recv)

 	for {
 		select {
@@ -319,6 +327,14 @@ func (n *network) processNetChan(l tunnel.Listener) {
 					lastSeen:   now,
 				}
 				n.Unlock()
+				// advertise yourself to the network
+				if err := n.sendMsg("neighbour", NetworkChannel); err != nil {
+					log.Debugf("Network failed to advertise neighbours: %v", err)
+				}
+				// advertise all the routes when a new node has connected
+				if err := n.Router.Solicit(); err != nil {
+					log.Debugf("Network failed to solicit routes: %s", err)
+				}
 			case "neighbour":
 				// mark the time the message has been received
 				now := time.Now()
@@ -334,7 +350,8 @@ func (n *network) processNetChan(l tunnel.Listener) {
 				n.Lock()
 				log.Debugf("Network received neighbour message from: %s", pbNetNeighbour.Node.Id)
 				// only add the neighbour if it is NOT already in node's list of neighbours
-				if _, ok := n.neighbours[pbNetNeighbour.Node.Id]; !ok {
+				_, exists := n.neighbours[pbNetNeighbour.Node.Id]
+				if !exists {
 					n.neighbours[pbNetNeighbour.Node.Id] = &node{
 						id:         pbNetNeighbour.Node.Id,
 						address:    pbNetNeighbour.Node.Address,
@@ -347,7 +364,7 @@ func (n *network) processNetChan(l tunnel.Listener) {
 					n.neighbours[pbNetNeighbour.Node.Id].lastSeen = now
 				}
 				// update/store the neighbour node neighbours
-				// NOTE: * we dont update lastSeen time for the neighbours of the neighbour
+				// NOTE: * we do NOT update lastSeen time for the neighbours of the neighbour
 				//	 * even though we are NOT interested in neighbours of neighbours here
 				// 	   we still allocate the map of neighbours for each of them
 				for _, pbNeighbour := range pbNetNeighbour.Neighbours {
@@ -359,6 +376,13 @@ func (n *network) processNetChan(l tunnel.Listener) {
 					n.neighbours[pbNetNeighbour.Node.Id].neighbours[neighbourNode.id] = neighbourNode
 				}
 				n.Unlock()
+				// send a solicit message when discovering a new node
+				// NOTE: we need to send the solicit message here after the Lock is released as sendMsg locks, too
+				if !exists {
+					if err := n.sendMsg("solicit", NetworkChannel); err != nil {
+						log.Debugf("Network failed to send solicit message: %s", err)
+					}
+				}
 			case "close":
 				pbNetClose := &pbNet.Close{}
 				if err := proto.Unmarshal(m.Body, pbNetClose); err != nil {
@@ -383,6 +407,76 @@ func (n *network) processNetChan(l tunnel.Listener) {
 	}
 }

+// sendMsg sends a message to the tunnel channel
+func (n *network) sendMsg(msgType string, channel string) error {
+	node := &pbNet.Node{
+		Id:      n.options.Id,
+		Address: n.options.Address,
+	}
+
+	var protoMsg proto.Message
+
+	switch msgType {
+	case "connect":
+		protoMsg = &pbNet.Connect{
+			Node: node,
+		}
+	case "close":
+		protoMsg = &pbNet.Close{
+			Node: node,
+		}
+	case "solicit":
+		protoMsg = &pbNet.Solicit{
+			Node: node,
+		}
+	case "neighbour":
+		n.RLock()
+		nodes := make([]*pbNet.Node, len(n.neighbours))
+		i := 0
+		for id := range n.neighbours {
+			nodes[i] = &pbNet.Node{
+				Id:      id,
+				Address: n.neighbours[id].address,
+			}
+			i++
+		}
+		n.RUnlock()
+		protoMsg = &pbNet.Neighbour{
+			Node:       node,
+			Neighbours: nodes,
+		}
+	default:
+		return ErrMsgUnknown
+	}
+
+	body, err := proto.Marshal(protoMsg)
+	if err != nil {
+		return err
+	}
+	// create transport message and chuck it down the pipe
+	m := transport.Message{
+		Header: map[string]string{
+			"Micro-Method": msgType,
+		},
+		Body: body,
+	}
+
+	n.RLock()
+	client, ok := n.tunClient[channel]
+	if !ok {
+		n.RUnlock()
+		return ErrClientNotFound
+	}
+	n.RUnlock()
+
+	log.Debugf("Network sending %s message from: %s", msgType, node.Id)
+	if err := client.Send(&m); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // announce announces node neighbourhood to the network
 func (n *network) announce(client transport.Client) {
 	announce := time.NewTicker(AnnounceTime)
@@ -393,44 +487,9 @@ func (n *network) announce(client transport.Client) {
 		case <-n.closed:
 			return
 		case <-announce.C:
-			n.RLock()
-			nodes := make([]*pbNet.Node, len(n.neighbours))
-			i := 0
-			for id, _ := range n.neighbours {
-				nodes[i] = &pbNet.Node{
-					Id:      id,
-					Address: n.neighbours[id].address,
-				}
-				i++
-			}
-			n.RUnlock()
-
-			node := &pbNet.Node{
-				Id:      n.options.Id,
-				Address: n.options.Address,
-			}
-			pbNetNeighbour := &pbNet.Neighbour{
-				Node:       node,
-				Neighbours: nodes,
-			}
-
-			body, err := proto.Marshal(pbNetNeighbour)
-			if err != nil {
-				// TODO: should we bail here?
-				log.Debugf("Network failed to marshal neighbour message: %v", err)
-				continue
-			}
-			// create transport message and chuck it down the pipe
-			m := transport.Message{
-				Header: map[string]string{
-					"Micro-Method": "neighbour",
-				},
-				Body: body,
-			}
-
-			log.Debugf("Network sending neighbour message from: %s", node.Id)
-			if err := client.Send(&m); err != nil {
-				log.Debugf("Network failed to send neighbour messsage: %v", err)
+			// advertise yourself to the network
+			if err := n.sendMsg("neighbour", NetworkChannel); err != nil {
+				log.Debugf("Network failed to advertise neighbours: %v", err)
 				continue
 			}
 		}
@@ -550,7 +609,7 @@ func (n *network) setRouteMetric(route *router.Route) {

 	// check if the route origin is the neighbour of our neighbour
 	for _, node := range n.neighbours {
-		for id, _ := range node.neighbours {
+		for id := range node.neighbours {
 			if route.Router == id {
 				route.Metric = 100
 				n.RUnlock()
@@ -565,12 +624,12 @@ func (n *network) setRouteMetric(route *router.Route) {
 }

 // processCtrlChan processes messages received on ControlChannel
-func (n *network) processCtrlChan(l tunnel.Listener) {
+func (n *network) processCtrlChan(client transport.Client, listener tunnel.Listener) {
 	// receive control message queue
 	recv := make(chan *transport.Message, 128)

 	// accept ControlChannel cconnections
-	go n.acceptCtrlConn(l, recv)
+	go n.acceptCtrlConn(listener, recv)

 	for {
 		select {
@@ -601,6 +660,10 @@ func (n *network) processCtrlChan(l tunnel.Listener) {
 						lastSeen:   now,
 					}
 					n.neighbours[pbRtrAdvert.Id] = advertNode
+					// send a solicit message when discovering a new node
+					if err := n.sendMsg("solicit", NetworkChannel); err != nil {
+						log.Debugf("Network failed to send solicit message: %s", err)
+					}
 				}
 				n.RUnlock()

@@ -657,6 +720,11 @@ func (n *network) processCtrlChan(l tunnel.Listener) {
 					log.Debugf("Network failed to process advert %s: %v", advert.Id, err)
 					continue
 				}
+			case "solicit":
+				// advertise all the routes when a new node has connected
+				if err := n.Router.Solicit(); err != nil {
+					log.Debugf("Network failed to solicit routes: %s", err)
+				}
 			}
 		case <-n.closed:
 			return
@@ -724,8 +792,6 @@ func (n *network) advertise(client transport.Client, advertChan <-chan *router.A
 // Connect connects the network
 func (n *network) Connect() error {
 	n.Lock()
-	defer n.Unlock()
-
 	// return if already connected
 	if n.connected {
 		return nil
@@ -793,32 +859,14 @@ func (n *network) Connect() error {
 	if err := n.server.Start(); err != nil {
 		return err
 	}
+	n.Unlock()

 	// send connect message to NetworkChannel
 	// NOTE: in theory we could do this as soon as
 	// Dial to NetworkChannel succeeds, but instead
 	// we initialize all other node resources first
-	node := &pbNet.Node{
-		Id:      n.options.Id,
-		Address: n.options.Address,
-	}
-	pbNetConnect := &pbNet.Connect{
-		Node: node,
-	}
-
-	// only proceed with sending to NetworkChannel if marshal succeeds
-	if body, err := proto.Marshal(pbNetConnect); err == nil {
-		m := transport.Message{
-			Header: map[string]string{
-				"Micro-Method": "connect",
-			},
-			Body: body,
-		}
-
-		log.Debugf("Network sending connect message: %s", node.Id)
-		if err := netClient.Send(&m); err != nil {
-			log.Debugf("Network failed to send connect messsage: %v", err)
-		}
+	if err := n.sendMsg("connect", NetworkChannel); err != nil {
+		log.Debugf("Network failed to send connect message: %s", err)
 	}

 	// go resolving network nodes
@@ -828,14 +876,15 @@ func (n *network) Connect() error {
 	// prune stale nodes
 	go n.prune()
 	// listen to network messages
-	go n.processNetChan(netListener)
+	go n.processNetChan(netClient, netListener)
 	// advertise service routes
 	go n.advertise(ctrlClient, advertChan)
 	// accept and process routes
-	go n.processCtrlChan(ctrlListener)
+	go n.processCtrlChan(ctrlClient, ctrlListener)

-	// set connected to true
+	n.Lock()
 	n.connected = true
+	n.Unlock()

 	return nil
 }
@@ -912,31 +961,9 @@ func (n *network) Close() error {
 		return nil
 	default:
 		// send close message only if we managed to connect to NetworkChannel
-		if netClient, ok := n.tunClient[NetworkChannel]; ok {
-			// send connect message to NetworkChannel
-			node := &pbNet.Node{
-				Id:      n.options.Id,
-				Address: n.options.Address,
-			}
-			pbNetClose := &pbNet.Close{
-				Node: node,
-			}
-
-			// only proceed with sending to NetworkChannel if marshal succeeds
-			if body, err := proto.Marshal(pbNetClose); err == nil {
-				// create transport message and chuck it down the pipe
-				m := transport.Message{
-					Header: map[string]string{
-						"Micro-Method": "close",
-					},
-					Body: body,
-				}
-
-				log.Debugf("Network sending close message from: %s", node.Id)
-				if err := netClient.Send(&m); err != nil {
-					log.Debugf("Network failed to send close messsage: %v", err)
-				}
-			}
+		log.Debugf("Sending close message from: %s", n.options.Id)
+		if err := n.sendMsg("close", NetworkChannel); err != nil {
+			log.Debugf("Network failed to send close message: %s", err)
 		}
 		// TODO: send close message to the network channel
 		close(n.closed)
--- a/network/proto/network.pb.go
+++ b/network/proto/network.pb.go
@@ -305,6 +305,47 @@ func (m *Close) GetNode() *Node {
 	return nil
 }

+// Solicit is sent when requesting route advertisement from the network nodes
+type Solicit struct {
+	// network node
+	Node                 *Node    `protobuf:"bytes,1,opt,name=node,proto3" json:"node,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Solicit) Reset()         { *m = Solicit{} }
+func (m *Solicit) String() string { return proto.CompactTextString(m) }
+func (*Solicit) ProtoMessage()    {}
+func (*Solicit) Descriptor() ([]byte, []int) {
+	return fileDescriptor_8571034d60397816, []int{7}
+}
+
+func (m *Solicit) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Solicit.Unmarshal(m, b)
+}
+func (m *Solicit) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Solicit.Marshal(b, m, deterministic)
+}
+func (m *Solicit) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Solicit.Merge(m, src)
+}
+func (m *Solicit) XXX_Size() int {
+	return xxx_messageInfo_Solicit.Size(m)
+}
+func (m *Solicit) XXX_DiscardUnknown() {
+	xxx_messageInfo_Solicit.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Solicit proto.InternalMessageInfo
+
+func (m *Solicit) GetNode() *Node {
+	if m != nil {
+		return m.Node
+	}
+	return nil
+}
+
 // Neighbour is used to nnounce node neighbourhood
 type Neighbour struct {
 	// network node
@@ -320,7 +361,7 @@ func (m *Neighbour) Reset()         { *m = Neighbour{} }
 func (m *Neighbour) String() string { return proto.CompactTextString(m) }
 func (*Neighbour) ProtoMessage()    {}
 func (*Neighbour) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8571034d60397816, []int{7}
+	return fileDescriptor_8571034d60397816, []int{8}
 }

 func (m *Neighbour) XXX_Unmarshal(b []byte) error {
@@ -363,33 +404,35 @@ func init() {
 	proto.RegisterType((*Node)(nil), "go.micro.network.Node")
 	proto.RegisterType((*Connect)(nil), "go.micro.network.Connect")
 	proto.RegisterType((*Close)(nil), "go.micro.network.Close")
+	proto.RegisterType((*Solicit)(nil), "go.micro.network.Solicit")
 	proto.RegisterType((*Neighbour)(nil), "go.micro.network.Neighbour")
 }

 func init() { proto.RegisterFile("network.proto", fileDescriptor_8571034d60397816) }

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+	0x88, 0xc5, 0x71, 0x5e, 0x08, 0x8d, 0xf5, 0xc2, 0xc7, 0x08, 0xc9, 0x3d, 0xc0, 0xfa, 0xf7, 0x28,
+	0xaf, 0x7a, 0xf0, 0x12, 0x4b, 0xcc, 0xc1, 0xa7, 0x03, 0xee, 0xb4, 0x00, 0xc9, 0x13, 0x80, 0xc9,
+	0x44, 0x1e, 0x1b, 0x45, 0xbc, 0x6f, 0xb5, 0x0d, 0x92, 0xbd, 0x65, 0xbf, 0xbd, 0x83, 0x94, 0xa3,
+	0x44, 0xff, 0x90, 0x09, 0x34, 0xf2, 0x4e, 0x6e, 0xa6, 0x48, 0x7b, 0xf7, 0x14, 0xa5, 0x20, 0xfa,
+	0x97, 0xfb, 0xe0, 0xf5, 0xb4, 0x08, 0x5a, 0x1b, 0x21, 0x22, 0xdd, 0x03, 0x29, 0x29, 0xa5, 0xd1,
+	0xbf, 0xfa, 0x95, 0xb7, 0xf2, 0x88, 0xfe, 0x9a, 0x47, 0x32, 0xfc, 0x0a, 0x00, 0x00, 0xff, 0xff,
+	0x59, 0xcf, 0xab, 0xb5, 0x7c, 0x03, 0x00, 0x00,
 }
--- a/network/proto/network.proto
+++ b/network/proto/network.proto
@@ -49,6 +49,12 @@ message Close {
        Node node = 1;
 }

+// Solicit is sent when requesting route advertisement from the network nodes
+message Solicit {
+        // network node
+        Node node = 1;
+}
+
 // Neighbour is used to nnounce node neighbourhood
 message Neighbour {
        // network node
--- a/router/default.go
+++ b/router/default.go
@@ -120,6 +120,9 @@ func (r *router) manageRoute(route Route, action string) error {
 		if err := r.table.Delete(route); err != nil && err != ErrRouteNotFound {
 			return fmt.Errorf("failed deleting route for service %s: %s", route.Service, err)
 		}
+	case "solicit":
+		// nothing to do here
+		return nil
 	default:
 		return fmt.Errorf("failed to manage route for service %s. Unknown action: %s", route.Service, action)
 	}
@@ -602,21 +605,10 @@ func (r *router) Advertise() (<-chan *Advert, error) {
 		r.subscribers[uuid.New().String()] = advertChan
 		return advertChan, nil
 	case Running:
-		// list routing table routes to announce
-		routes, err := r.table.List()
+		// list all the routes and pack them into even slice to advertise
+		events, err := r.flushRouteEvents(Create)
 		if err != nil {
-			return nil, fmt.Errorf("failed listing routes: %s", err)
-		}
-
-		// collect all the added routes before we attempt to add default gateway
-		events := make([]*Event, len(routes))
-		for i, route := range routes {
-			event := &Event{
-				Type:      Create,
-				Timestamp: time.Now(),
-				Route:     route,
-			}
-			events[i] = event
+			return nil, fmt.Errorf("failed to flush routes: %s", err)
 		}

 		// create event channels
@@ -687,6 +679,43 @@ func (r *router) Process(a *Advert) error {
 	return nil
 }

+// flushRouteEvents returns a slice of events, one per each route in the routing table
+func (r *router) flushRouteEvents(evType EventType) ([]*Event, error) {
+	// list all routes
+	routes, err := r.table.List()
+	if err != nil {
+		return nil, fmt.Errorf("failed listing routes: %s", err)
+	}
+
+	// build a list of events to advertise
+	events := make([]*Event, len(routes))
+	for i, route := range routes {
+		event := &Event{
+			Type:      evType,
+			Timestamp: time.Now(),
+			Route:     route,
+		}
+		events[i] = event
+	}
+
+	return events, nil
+}
+
+// Solicit advertises all of its routes to the network
+// It returns error if the router fails to list the routes
+func (r *router) Solicit() error {
+	events, err := r.flushRouteEvents(Update)
+	if err != nil {
+		return fmt.Errorf("failed solicit routes: %s", err)
+	}
+
+	// advertise the routes
+	r.advertWg.Add(1)
+	go r.publishAdvert(RouteUpdate, events)
+
+	return nil
+}
+
 // Lookup routes in the routing table
 func (r *router) Lookup(q Query) ([]Route, error) {
 	return r.table.Query(q)
--- a/router/proto/router.proto
+++ b/router/proto/router.proto
@@ -7,6 +7,7 @@ service Router {
 	rpc Lookup(LookupRequest) returns (LookupResponse) {};
        rpc Watch(WatchRequest) returns (stream Event) {};
        rpc Advertise(Request) returns (stream Advert) {};
+        rpc Solicit(Request) returns (Response) {};
        rpc Process(Advert) returns (ProcessResponse) {};
 	rpc Status(Request) returns (StatusResponse) {};
 }
@@ -22,6 +23,9 @@ service Table {
 // Empty request
 message Request {}

+// Empty response
+message Response {}
+
 // ListResponse is returned by List
 message ListResponse {
 	repeated Route routes = 1;
--- a/router/router.go
+++ b/router/router.go
@@ -28,6 +28,8 @@ type Router interface {
 	Advertise() (<-chan *Advert, error)
 	// Process processes incoming adverts
 	Process(*Advert) error
+	// Solicit advertises the whole routing table to the network
+	Solicit() error
 	// Lookup queries routes in the routing table
 	Lookup(Query) ([]Route, error)
 	// Watch returns a watcher which tracks updates to the routing table
--- a/router/service/service.go
+++ b/router/service/service.go
@@ -220,6 +220,42 @@ func (s *svc) Process(advert *router.Advert) error {
 	return nil
 }

+// Solicit advertise all routes
+func (s *svc) Solicit() error {
+	// list all the routes
+	routes, err := s.table.List()
+	if err != nil {
+		return err
+	}
+
+	// build events to advertise
+	events := make([]*router.Event, len(routes))
+	for i, _ := range events {
+		events[i] = &router.Event{
+			Type:      router.Update,
+			Timestamp: time.Now(),
+			Route:     routes[i],
+		}
+	}
+
+	advert := &router.Advert{
+		Id:        s.opts.Id,
+		Type:      router.RouteUpdate,
+		Timestamp: time.Now(),
+		TTL:       time.Duration(router.DefaultAdvertTTL),
+		Events:    events,
+	}
+
+	select {
+	case s.advertChan <- advert:
+	case <-s.exit:
+		close(s.advertChan)
+		return nil
+	}
+
+	return nil
+}
+
 // Status returns router status
 func (s *svc) Status() router.Status {
 	s.Lock()