Merge pull request #649 from gravitl/feature_v0.10.0_server_response

Feature v0.10.0 server response

controllers/node_grpc.go

@@ -67,6 +67,16 @@ func (s *NodeServiceServer) CreateNode(ctx context.Context, req *nodepb.Object)
 		}
 	}
 
+	var serverNodes = logic.GetServerNodes(node.Network)
+	var serverAddrs = make([]models.ServerAddr, len(serverNodes))
+	for i, server := range serverNodes {
+		serverAddrs[i] = models.ServerAddr{
+			IsLeader: logic.IsLeader(&server),
+			Address:  server.Address,
+		}
+	}
+	node.NetworkSettings.DefaultServerAddrs = serverAddrs
+
 	err = logic.CreateNode(&node)
 	if err != nil {
 		return nil, err

logger/logger.go

@@ -6,6 +6,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 )
 
@@ -36,6 +37,9 @@ func ResetLogs() {
 
 // Log - handles adding logs
 func Log(verbosity int, message ...string) {
+	var mu sync.Mutex
+	mu.Lock()
+	defer mu.Unlock()
 	var currentTime = time.Now()
 	var currentMessage = makeString(message...)
 	if int32(verbosity) <= getVerbose() && getVerbose() >= 0 {

logic/nodes.go

@@ -58,6 +58,21 @@ func GetSortedNetworkServerNodes(network string) ([]models.Node, error) {
 	return nodes, nil
 }
 
+// GetServerNodes - gets the server nodes of a network
+func GetServerNodes(network string) []models.Node {
+	var nodes, err = GetNetworkNodes(network)
+	var serverNodes = make([]models.Node, 0)
+	if err != nil {
+		return serverNodes
+	}
+	for _, node := range nodes {
+		if node.IsServer == "yes" {
+			serverNodes = append(serverNodes, node)
+		}
+	}
+	return serverNodes
+}
+
 // UncordonNode - approves a node to join a network
 func UncordonNode(nodeid string) (models.Node, error) {
 	node, err := GetNodeByID(nodeid)

logic/peers.go

@@ -20,6 +20,7 @@ func GetPeerUpdate(node *models.Node) (models.PeerUpdate, error) {
 	if err != nil {
 		return models.PeerUpdate{}, err
 	}
+	var serverNodeAddresses = []models.ServerAddr{}
 	for _, peer := range networkNodes {
 		if peer.ID == node.ID {
 			//skip yourself
@@ -55,9 +56,13 @@ func GetPeerUpdate(node *models.Node) (models.PeerUpdate, error) {
 			PersistentKeepaliveInterval: &keepalive,
 		}
 		peers = append(peers, peerData)
+		if peer.IsServer == "yes" {
+			serverNodeAddresses = append(serverNodeAddresses, models.ServerAddr{IsLeader: IsLeader(&peer), Address: peer.Address})
+		}
 	}
 	peerUpdate.Network = node.Network
 	peerUpdate.Peers = peers
+	peerUpdate.ServerAddrs = serverNodeAddresses
 	return peerUpdate, nil
 }
 

models/mqtt.go

@@ -2,12 +2,15 @@ package models
 
 import "golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
+// PeerUpdate - struct
 type PeerUpdate struct {
-	Network string
-	Peers   []wgtypes.PeerConfig
+	Network     string               `json:"network" bson:"network" yaml:"network"`
+	ServerAddrs []ServerAddr         `json:"serveraddrs" bson:"serveraddrs" yaml:"serveraddrs"`
+	Peers       []wgtypes.PeerConfig `json:"peers" bson:"peers" yaml:"peers"`
 }
 
+// KeyUpdate - key update struct
 type KeyUpdate struct {
-	Network   string
-	Interface string
+	Network   string `json:"network" bson:"network"`
+	Interface string `json:"interface" bson:"interface"`
 }

models/network.go

@@ -34,10 +34,11 @@ type Network struct {
 	LocalRange          string      `json:"localrange" bson:"localrange" validate:"omitempty,cidr"`
 
 	// checkin interval is depreciated at the network level. Set on server with CHECKIN_INTERVAL
-	DefaultCheckInInterval int32  `json:"checkininterval,omitempty" bson:"checkininterval,omitempty" validate:"omitempty,numeric,min=2,max=100000"`
-	DefaultUDPHolePunch    string `json:"defaultudpholepunch" bson:"defaultudpholepunch" validate:"checkyesorno"`
-	DefaultExtClientDNS    string `json:"defaultextclientdns" bson:"defaultextclientdns"`
-	DefaultMTU             int32  `json:"defaultmtu" bson:"defaultmtu"`
+	DefaultCheckInInterval int32        `json:"checkininterval,omitempty" bson:"checkininterval,omitempty" validate:"omitempty,numeric,min=2,max=100000"`
+	DefaultUDPHolePunch    string       `json:"defaultudpholepunch" bson:"defaultudpholepunch" validate:"checkyesorno"`
+	DefaultExtClientDNS    string       `json:"defaultextclientdns" bson:"defaultextclientdns"`
+	DefaultMTU             int32        `json:"defaultmtu" bson:"defaultmtu"`
+	DefaultServerAddrs     []ServerAddr `json:"defaultserveraddrs" bson:"defaultserveraddrs" yaml:"defaultserveraddrs"`
 }
 
 // SaveData - sensitive fields of a network that should be kept the same

models/structs.go

@@ -169,3 +169,9 @@ type Telemetry struct {
 	UUID     string `json:"uuid" bson:"uuid"`
 	LastSend int64  `json:"lastsend" bson:"lastsend"`
 }
+
+// ServerAddr - to pass to clients to tell server addresses and if it's the leader or not
+type ServerAddr struct {
+	IsLeader bool   `json:"isleader" bson:"isleader" yaml:"isleader"`
+	Address  string `json:"address" bson:"address" yaml:"address"`
+}

netclient/functions/daemon.go

@@ -3,10 +3,12 @@ package functions
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"log"
 	"os"
 	"os/signal"
 	"runtime"
+	"sync"
 	"syscall"
 	"time"
 
@@ -19,6 +21,22 @@ import (
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 )
 
+var messageCache = make(map[string]string, 20)
+
+const lastNodeUpdate = "lnu"
+const lastPeerUpdate = "lpu"
+
+func insert(network, which, cache string) {
+	var mu sync.Mutex
+	mu.Lock()
+	defer mu.Unlock()
+	messageCache[fmt.Sprintf("%s%s", network, which)] = cache
+}
+
+func read(network, which string) string {
+	return messageCache[fmt.Sprintf("%s%s", network, which)]
+}
+
 // Daemon runs netclient daemon from command line
 func Daemon() error {
 	ctx, cancel := context.WithCancel(context.Background())
@@ -41,8 +59,13 @@ func Daemon() error {
 // SetupMQTT creates a connection to broker and return client
 func SetupMQTT(cfg *config.ClientConfig) mqtt.Client {
 	opts := mqtt.NewClientOptions()
-	ncutils.Log("setting broker to " + cfg.Server.CoreDNSAddr + ":1883")
-	opts.AddBroker(cfg.Server.CoreDNSAddr + ":1883")
+	for _, server := range cfg.Node.NetworkSettings.DefaultServerAddrs {
+		if server.Address != "" && server.IsLeader {
+			ncutils.Log(fmt.Sprintf("adding server (%s) to listen on network %s \n", server.Address, cfg.Node.Network))
+			opts.AddBroker(server.Address + ":1883")
+			break
+		}
+	}
 	opts.SetDefaultPublishHandler(All)
 	client := mqtt.NewClient(opts)
 	if token := client.Connect(); token.Wait() && token.Error() != nil {
@@ -65,13 +88,13 @@ func MessageQueue(ctx context.Context, network string) {
 		}
 		ncutils.Log("subscribed to all topics for debugging purposes")
 	}
-	if token := client.Subscribe("update/"+cfg.Node.ID, 0, NodeUpdate); token.Wait() && token.Error() != nil {
+	if token := client.Subscribe("update/"+cfg.Node.ID, 0, mqtt.MessageHandler(NodeUpdate)); token.Wait() && token.Error() != nil {
 		log.Fatal(token.Error())
 	}
 	if cfg.DebugOn {
 		ncutils.Log("subscribed to node updates for node " + cfg.Node.Name + " update/" + cfg.Node.ID)
 	}
-	if token := client.Subscribe("update/peers/"+cfg.Node.ID, 0, UpdatePeers); token.Wait() && token.Error() != nil {
+	if token := client.Subscribe("update/peers/"+cfg.Node.ID, 0, mqtt.MessageHandler(UpdatePeers)); token.Wait() && token.Error() != nil {
 		log.Fatal(token.Error())
 	}
 	if cfg.DebugOn {
@@ -91,8 +114,7 @@ var All mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
 }
 
 // NodeUpdate -- mqtt message handler for /update/<NodeID> topic
-var NodeUpdate mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
-	ncutils.Log("received message to update node " + string(msg.Payload()))
+func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
 	//potentiall blocking i/o so do this in a go routine
 	go func() {
 		var newNode models.Node
@@ -102,6 +124,13 @@ var NodeUpdate mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 			ncutils.Log("error unmarshalling node update data" + err.Error())
 			return
 		}
+		ncutils.Log("received message to update node " + newNode.Name)
+		// see if cache hit, if so skip
+		var currentMessage = read(newNode.Network, lastNodeUpdate)
+		if currentMessage == string(msg.Payload()) {
+			return
+		}
+		insert(newNode.Network, lastNodeUpdate, string(msg.Payload()))
 		cfg.Network = newNode.Network
 		cfg.ReadConfig()
 		//check if interface name has changed if so delete.
@@ -169,7 +198,7 @@ var NodeUpdate mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 }
 
 // UpdatePeers -- mqtt message handler for /update/peers/<NodeID> topic
-var UpdatePeers mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
+func UpdatePeers(client mqtt.Client, msg mqtt.Message) {
 	go func() {
 		var peerUpdate models.PeerUpdate
 		err := json.Unmarshal(msg.Payload(), &peerUpdate)
@@ -177,10 +206,21 @@ var UpdatePeers mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 			ncutils.Log("error unmarshalling peer data")
 			return
 		}
+		// see if cache hit, if so skip
+		var currentMessage = read(peerUpdate.Network, lastPeerUpdate)
+		if currentMessage == string(msg.Payload()) {
+			return
+		}
+		insert(peerUpdate.Network, lastPeerUpdate, string(msg.Payload()))
 		ncutils.Log("update peer handler")
 		var cfg config.ClientConfig
 		cfg.Network = peerUpdate.Network
 		cfg.ReadConfig()
+		var shouldReSub = shouldResub(cfg.Node.NetworkSettings.DefaultServerAddrs, peerUpdate.ServerAddrs)
+		if shouldReSub {
+			Resubscribe(client, &cfg)
+			cfg.Node.NetworkSettings.DefaultServerAddrs = peerUpdate.ServerAddrs
+		}
 		file := ncutils.GetNetclientPathSpecific() + cfg.Node.Interface + ".conf"
 		err = wireguard.UpdateWgPeers(file, peerUpdate.Peers)
 		if err != nil {
@@ -196,6 +236,29 @@ var UpdatePeers mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 	}()
 }
 
+// Resubscribe --- handles resubscribing if needed
+func Resubscribe(client mqtt.Client, cfg *config.ClientConfig) error {
+	if err := config.ModConfig(&cfg.Node); err == nil {
+		ncutils.Log("resubbing on network " + cfg.Node.Network)
+		client.Disconnect(250)
+		client = SetupMQTT(cfg)
+		if token := client.Subscribe("update/"+cfg.Node.ID, 0, NodeUpdate); token.Wait() && token.Error() != nil {
+			log.Fatal(token.Error())
+		}
+		if cfg.DebugOn {
+			ncutils.Log("subscribed to node updates for node " + cfg.Node.Name + " update/" + cfg.Node.ID)
+		}
+		if token := client.Subscribe("update/peers/"+cfg.Node.ID, 0, UpdatePeers); token.Wait() && token.Error() != nil {
+			log.Fatal(token.Error())
+		}
+		ncutils.Log("finished re subbing")
+		return nil
+	} else {
+		ncutils.Log("could not mod config when re-subbing")
+		return err
+	}
+}
+
 // UpdateKeys -- updates private key and returns new publickey
 func UpdateKeys(cfg *config.ClientConfig, client mqtt.Client) error {
 	ncutils.Log("received message to update keys")
@@ -291,3 +354,15 @@ func Hello(cfg *config.ClientConfig, network string) {
 	}
 	client.Disconnect(250)
 }
+
+func shouldResub(currentServers, newServers []models.ServerAddr) bool {
+	if len(currentServers) != len(newServers) {
+		return true
+	}
+	for _, srv := range currentServers {
+		if !ncutils.ServerAddrSliceContains(newServers, srv) {
+			return true
+		}
+	}
+	return false
+}

netclient/functions/join.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"log"
 	"os/exec"
+	"runtime"
 
 	"github.com/google/uuid"
 	nodepb "github.com/gravitl/netmaker/grpc"
@@ -101,8 +102,7 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 	// make sure name is appropriate, if not, give blank name
 	cfg.Node.Name = formatName(cfg.Node)
 	// differentiate between client/server here
-	var node models.Node // fill this node with appropriate calls
-	postnode := &models.Node{
+	var node = models.Node{
 		Password:            cfg.Node.Password,
 		ID:                  cfg.Node.ID,
 		MacAddress:          cfg.Node.MacAddress,
@@ -124,44 +124,17 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 		UDPHolePunch:        cfg.Node.UDPHolePunch,
 	}
 
-	if cfg.Node.IsServer != "yes" {
-		ncutils.Log("joining " + cfg.Network + " at " + cfg.Server.GRPCAddress)
-		var wcclient nodepb.NodeServiceClient
-
-		conn, err := grpc.Dial(cfg.Server.GRPCAddress,
-			ncutils.GRPCRequestOpts(cfg.Server.GRPCSSL))
+	ncutils.Log("joining " + cfg.Network + " at " + cfg.Server.GRPCAddress)
+	var wcclient nodepb.NodeServiceClient
 
-		if err != nil {
-			log.Fatalf("Unable to establish client connection to "+cfg.Server.GRPCAddress+": %v", err)
-		}
-		defer conn.Close()
-		wcclient = nodepb.NewNodeServiceClient(conn)
+	conn, err := grpc.Dial(cfg.Server.GRPCAddress,
+		ncutils.GRPCRequestOpts(cfg.Server.GRPCSSL))
 
-		if err = config.ModConfig(postnode); err != nil {
-			return err
-		}
-		data, err := json.Marshal(postnode)
-		if err != nil {
-			return err
-		}
-		// Create node on server
-		res, err := wcclient.CreateNode(
-			context.TODO(),
-			&nodepb.Object{
-				Data: string(data),
-				Type: nodepb.NODE_TYPE,
-			},
-		)
-		if err != nil {
-			return err
-		}
-		ncutils.PrintLog("node created on remote server...updating configs", 1)
-
-		nodeData := res.Data
-		if err = json.Unmarshal([]byte(nodeData), &node); err != nil {
-			return err
-		}
+	if err != nil {
+		log.Fatalf("Unable to establish client connection to "+cfg.Server.GRPCAddress+": %v", err)
 	}
+	defer conn.Close()
+	wcclient = nodepb.NewNodeServiceClient(conn)
 
 	// get free port based on returned default listen port
 	node.ListenPort, err = ncutils.GetFreePort(node.ListenPort)
@@ -182,32 +155,48 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 		cfg.Node.IsStatic = "yes"
 	}
 
-	if node.IsServer != "yes" { // == handle client side ==
-		err = config.ModConfig(&node)
-		if err != nil {
-			return err
-		}
-		err = wireguard.StorePrivKey(privateKey, cfg.Network)
-		if err != nil {
-			return err
-		}
-		if node.IsPending == "yes" {
-			ncutils.Log("Node is marked as PENDING.")
-			ncutils.Log("Awaiting approval from Admin before configuring WireGuard.")
-			if cfg.Daemon != "off" {
-				return daemon.InstallDaemon(cfg)
-			}
-		}
-		// pushing any local changes to server before starting wireguard
-		err = Push(cfg.Network)
-		if err != nil {
-			return err
-		}
-		// attempt to make backup
-		if err = config.SaveBackup(node.Network); err != nil {
-			ncutils.Log("failed to make backup, node will not auto restore if config is corrupted")
+	err = wireguard.StorePrivKey(privateKey, cfg.Network)
+	if err != nil {
+		return err
+	}
+	if node.IsPending == "yes" {
+		ncutils.Log("Node is marked as PENDING.")
+		ncutils.Log("Awaiting approval from Admin before configuring WireGuard.")
+		if cfg.Daemon != "off" {
+			return daemon.InstallDaemon(cfg)
 		}
 	}
+	data, err := json.Marshal(&node)
+	if err != nil {
+		return err
+	}
+	// Create node on server
+	res, err := wcclient.CreateNode(
+		context.TODO(),
+		&nodepb.Object{
+			Data: string(data),
+			Type: nodepb.NODE_TYPE,
+		},
+	)
+	if err != nil {
+		return err
+	}
+	ncutils.PrintLog("node created on remote server...updating configs", 1)
+
+	nodeData := res.Data
+	if err = json.Unmarshal([]byte(nodeData), &node); err != nil {
+		return err
+	}
+	node.OS = runtime.GOOS
+	cfg.Node = node
+	err = config.ModConfig(&node)
+	if err != nil {
+		return err
+	}
+	// attempt to make backup
+	if err = config.SaveBackup(node.Network); err != nil {
+		ncutils.Log("failed to make backup, node will not auto restore if config is corrupted")
+	}
 
 	ncutils.Log("retrieving peers")
 	peers, hasGateway, gateways, err := server.GetPeers(node.MacAddress, cfg.Network, cfg.Server.GRPCAddress, node.IsDualStack == "yes", node.IsIngressGateway == "yes", node.IsServer == "yes")

netclient/ncutils/netclientutils.go

@@ -17,6 +17,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/gravitl/netmaker/models"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"google.golang.org/grpc"
@@ -532,3 +533,13 @@ func CheckWG() {
 		log.Println("running userspace WireGuard with " + uspace)
 	}
 }
+
+// ServerAddrSliceContains - sees if a string slice contains a string element
+func ServerAddrSliceContains(slice []models.ServerAddr, item models.ServerAddr) bool {
+	for _, s := range slice {
+		if s.Address == item.Address && s.IsLeader == item.IsLeader {
+			return true
+		}
+	}
+	return false
+}