add matchtag and fix tests

README.md

@@ -5,9 +5,6 @@ The most common use case for this is anycast (vip) based load balancing for infr
 
 For some practical examples and more details, check out this blog post : https://mayuresh82.github.io/2020/11/28/automatic_service_discovery_anycast/
 
-# Looking for code reviewers
-If you are interested in being a reviewer and/or co-maintainer, please reach out to @mayuresh82 !
-
 ## Installation
 Use the docker container at mayuresh82/gocast or compile from source:
 
@@ -63,22 +60,6 @@ Alternatively, if `gocast_nat=protocol:port` is specified, then GoCast will crea
 
 Example: `gocast_nat=tcp:53` and `gocast_nat=udp:53`
 
-## Configuration Reload
-
-GoCast supports dynamic configuration reloading without service restart. Send a `SIGHUP` signal to reload the configuration:
-
-```bash
-kill -HUP $(pidof gocast)
-```
-
-**What gets reloaded:**
-- BGP configuration (peers, AS numbers, MD5 passwords, communities)
-- Application definitions (add/remove/update apps)
-- Agent settings (Consul, timers, intervals)
-
-**Important:** Reloading BGP configuration causes existing BGP sessions to be restarted, resulting in brief routing interruption. Routes are automatically re-announced after reload.
-Consul-discovered apps are not removed during reload.
-
 ## Docker support
 The docker image at mayuresh82/gocast can be used to run GoCast inside a container. In order for GoCast to manipulate the host network stack correctly, the container needs to run with NET_ADMIN capablity and host mode networking. For example:
 ```

config.yaml

@@ -11,33 +11,25 @@ agent:
   consul_query_interval: 5m
   # token to authenticate client if consul requires it
   consul_token: 00000000-0000-0000-0000-000000000000
+  # this tag must be present in consul for Gocast to pickup the service
+  # by default its enable_gocast
+  consul_match_tag: enable_gocast
 
 bgp:
   local_as: 12345
   remote_as: 6789
   # override the peer IP to use instead of auto discovering
   peer_ip: 10.10.10.1
-
-  # Alternatively, define multiple BGP peers for redundancy
-  #peers:
-  #  - peer_ip: 10.10.10.1
-  #    peer_as: 6789
-  #    communities:
-  #      - 100:100
-  #      - 200:200
-  #    md5_env_var: GOCAST_BGP_PEER1_PASSWORD  # optional. Set via: export GOCAST_BGP_PEER1_PASSWORD="secret"
-  #  - peer_ip: 10.10.10.2
-  #    peer_as: 6789
-  #    communities:
-  #      - 100:101
-  #      - 200:201
-  #    multi_hop: true  # optional
-  #    md5_password: "secret123" # optional
-  
   communities:
     - asn:nnnn
     - asn:nnnn
   origin: igp
+  # family will determine whether we want to peer over an ipv4 or ipv6 session
+  # one gocast instance can only peer over one session. Multiple sessions are not
+  # supported. The default is 4
+  family: 4
+  # router ID is required when family 6 is specified
+  router_id: 1.1.1.1
 
 # optional list of apps to register on startup
 apps:
@@ -46,5 +38,4 @@ apps:
     vip_config:
       # additional per VIP BGP communities
       bgp_communities: [ aaaa:bbbb ]
-    monitors: 
+    monitor: port:tcp:5000
-      - port:tcp:5000

config/config.go

@@ -16,27 +16,18 @@ type AgentConfig struct {
 	ConsulAddr          string        `yaml:"consul_addr"`
 	ConsulQueryInterval time.Duration `yaml:"consul_query_interval"`
 	ConsulToken         string        `yaml:"consul_token"`
-}
+	ConsulMatchTag      string        `yaml:"consul_match_tag"`
-
-type PeerConfig struct {
-	PeerIP      string   `yaml:"peer_ip"`
-	PeerAS      int      `yaml:"peer_as"`
-	MultiHop    *bool    `yaml:"multi_hop,omitempty"`
-	Communities []string `yaml:"communities,omitempty"`
-	MD5Password string   `yaml:"md5_password,omitempty"`
-	MD5EnvVar   string   `yaml:"md5_env_var,omitempty"`
 }
 
 type BgpConfig struct {
 	LocalAS     int    `yaml:"local_as"`
+	PeerAS      int    `yaml:"peer_as"`
 	LocalIP     string `yaml:"local_ip"`
-	// Legacy single-peer config (deprecated but supported for backward compatibility)
+	PeerIP      string `yaml:"peer_ip"`
-	PeerAS      int          `yaml:"peer_as,omitempty"`
-	PeerIP      string       `yaml:"peer_ip,omitempty"`
-	// New multi-peer config
-	Peers       []PeerConfig `yaml:"peers,omitempty"`
 	Communities []string
 	Origin      string
+	Family      int
+	RouterID    string `yaml:"router_id"`
 }
 
 type VipConfig struct {

controller/bgp.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net"
-	"os"
 	"strconv"
 	"strings"
 
@@ -21,134 +20,92 @@ type Route struct {
 }
 
 type Controller struct {
-	localAS     int
+	peerAS          int
-	localIP     net.IP
+	localIP, peerIP net.IP
-	peers       []c.PeerConfig
 	communities     []string
 	origin          uint32
+	multiHop        bool
 	s               *gobgp.BgpServer
 }
 
 func NewController(config c.BgpConfig) (*Controller, error) {
-	ctrl := &Controller{}
+	c := &Controller{}
 	var gw net.IP
 	var err error
-
+	if config.Family == 0 {
-	// Normalize config: convert legacy single-peer to new multi-peer format
+		config.Family = 4
-	peers := config.Peers
+	}
-	if len(peers) == 0 {
+	if config.PeerIP == "" {
-		// Backward compatibility: convert legacy config
+		gw, err := gateway(config.Family)
-		if config.PeerIP != "" {
+		if err != nil {
-			// Explicit peer IP configured
+			return nil, fmt.Errorf("unable to get gw ip: %v", err)
-			peers = []c.PeerConfig{{
+		}
-				PeerIP: config.PeerIP,
+		c.peerIP = gw
-				PeerAS: config.PeerAS,
-			}}
 	} else {
-			// No peer IP configured - use default gateway
+		c.peerIP = net.ParseIP(config.PeerIP)
-			gw, err = gateway()
-			if err != nil {
-				return nil, fmt.Errorf("Unable to get gateway ip: %v", err)
 	}
-			peers = []c.PeerConfig{{
-				PeerIP: gw.String(),
-				PeerAS: config.PeerAS,
-			}}
-		}
-	}
-
-	// Determine local IP
 	if config.LocalIP == "" {
-		// Use first peer to determine local IP
+		gw, err = via(c.peerIP)
-		firstPeerIP := net.ParseIP(peers[0].PeerIP)
-		if firstPeerIP == nil {
-			gw, err = gateway()
 		if err != nil {
-				return nil, fmt.Errorf("Unable to get gw ip: %v", err)
+			return nil, fmt.Errorf("unable to get gw ip: %v", err)
 		}
-			firstPeerIP = gw
+		c.localIP, err = localAddress(gw)
-		}
-		gw, err = via(firstPeerIP)
-		if err != nil {
-			return nil, fmt.Errorf("Unable to get gw ip: %v", err)
-		}
-		ctrl.localIP, err = localAddress(gw)
 		if err != nil {
 			return nil, err
 		}
 	} else {
-		ctrl.localIP = net.ParseIP(config.LocalIP)
+		c.localIP = net.ParseIP(config.LocalIP)
 	}
-
+	c.communities = config.Communities
-	ctrl.localAS = config.LocalAS
-	ctrl.peers = peers
-	ctrl.communities = config.Communities
-
 	switch config.Origin {
 	case "igp":
-		ctrl.origin = 0
+		c.origin = 0
 	case "egp":
-		ctrl.origin = 1
+		c.origin = 1
 	case "unknown":
-		ctrl.origin = 2
+		c.origin = 2
+	}
+	var rid string
+	if config.Family == 4 {
+		rid = c.localIP.String()
+	}
+	if config.RouterID != "" {
+		rid = config.RouterID
 	}
-
 	s := gobgp.NewBgpServer()
 	go s.Serve()
 	if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
 		Global: &api.Global{
 			As:         uint32(config.LocalAS),
-			RouterId:   ctrl.localIP.String(),
+			RouterId:   rid,
 			ListenPort: -1, // gobgp won't listen on tcp:179
 		},
 	}); err != nil {
-		return nil, fmt.Errorf("Unable to start bgp: %v", err)
+		return nil, fmt.Errorf("unable to start bgp: %v", err)
 	}
-	ctrl.s = s
+	c.s = s
-
+	c.peerAS = config.PeerAS
-	return ctrl, nil
+	// set mh by default for all ebgp peers
+	if c.peerAS != config.LocalAS {
+		c.multiHop = true
+	}
+	return c, nil
 }
 
-func (c *Controller) addPeer(peer *c.PeerConfig) error {
+func (c *Controller) AddPeer(peer string) error {
 	n := &api.Peer{
 		Conf: &api.PeerConf{
-			NeighborAddress: peer.PeerIP,
+			NeighborAddress: peer,
-			PeerAs:          uint32(peer.PeerAS),
+			PeerAs:          uint32(c.peerAS),
 		},
 	}
-
+	if c.multiHop {
-	// Enable multihop only if explicitly configured
-	if peer.MultiHop != nil && *peer.MultiHop {
 		n.EbgpMultihop = &api.EbgpMultihop{Enabled: true, MultihopTtl: uint32(255)}
 	}
-
-	// Configure MD5 authentication if specified
-	md5Password := c.getMD5Password(peer)
-	if md5Password != "" {
-		n.Conf.AuthPassword = md5Password
-	}
-
 	return c.s.AddPeer(context.Background(), &api.AddPeerRequest{Peer: n})
 }
 
-// getMD5Password retrieves the MD5 password from config or environment variable
+func (c *Controller) getApiPath(route *Route) *api.Path {
-func (c *Controller) getMD5Password(peer *c.PeerConfig) string {
-	// Priority 1: Check for environment variable
-	if peer.MD5EnvVar != "" {
-		if password := os.Getenv(peer.MD5EnvVar); password != "" {
-			return password
-		}
-	}
-
-	// Priority 2: Use password from config file
-	if peer.MD5Password != "" {
-		return peer.MD5Password
-	}
-
-	return ""
-}
-
-func (c *Controller) getApiPath(route *Route, peer *c.PeerConfig) *api.Path {
 	afi := api.Family_AFI_IP
 	if route.Net.IP.To4() == nil {
 		afi = api.Family_AFI_IP6
@@ -164,15 +121,8 @@ func (c *Controller) getApiPath(route *Route, peer *c.PeerConfig) *api.Path {
 	a2, _ := ptypes.MarshalAny(&api.NextHopAttribute{
 		NextHop: c.localIP.String(),
 	})
-
-	// Merge communities: global + per-peer + per-route
-	var allCommunities []string
-	allCommunities = append(allCommunities, c.communities...)
-	allCommunities = append(allCommunities, peer.Communities...)
-	allCommunities = append(allCommunities, route.Communities...)
-
 	var communities []uint32
-	for _, comm := range allCommunities {
+	for _, comm := range append(c.communities, route.Communities...) {
 		communities = append(communities, convertCommunity(comm))
 	}
 	a3, _ := ptypes.MarshalAny(&api.CommunitiesAttribute{
@@ -187,105 +137,49 @@ func (c *Controller) getApiPath(route *Route, peer *c.PeerConfig) *api.Path {
 }
 
 func (c *Controller) Announce(route *Route) error {
-	var errs []error
-
-	for i := range c.peers {
-		peer := &c.peers[i]
-
-		// Check if peer exists
 	var found bool
 	err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{}, func(p *api.Peer) {
-			if p.Conf.NeighborAddress == peer.PeerIP {
+		if p.Conf.NeighborAddress == c.peerIP.String() {
 			found = true
 		}
 	})
 	if err != nil {
-			errs = append(errs, fmt.Errorf("peer %s: list error: %v", peer.PeerIP, err))
+		return err
-			continue
 	}
-
-		// Add peer if not found
 	if !found {
-			if err := c.addPeer(peer); err != nil {
+		if err := c.AddPeer(c.peerIP.String()); err != nil {
-				errs = append(errs, fmt.Errorf("peer %s: add error: %v", peer.PeerIP, err))
+			return err
-				continue
 		}
 	}
-
+	_, err = c.s.AddPath(context.Background(), &api.AddPathRequest{Path: c.getApiPath(route)})
-		// Announce route to this peer
+	return err
-		path := c.getApiPath(route, peer)
-		if _, err := c.s.AddPath(context.Background(), &api.AddPathRequest{Path: path}); err != nil {
-			errs = append(errs, fmt.Errorf("peer %s: announce error: %v", peer.PeerIP, err))
-			continue
-		}
-	}
-
-	// Return aggregated errors if any peer failed
-	if len(errs) > 0 {
-		return fmt.Errorf("announcement errors: %v", errs)
-	}
-	return nil
 }
 
 func (c *Controller) Withdraw(route *Route) error {
-	var errs []error
+	return c.s.DeletePath(context.Background(), &api.DeletePathRequest{Path: c.getApiPath(route)})
-
-	for i := range c.peers {
-		peer := &c.peers[i]
-		path := c.getApiPath(route, peer)
-		if err := c.s.DeletePath(context.Background(), &api.DeletePathRequest{Path: path}); err != nil {
-			errs = append(errs, fmt.Errorf("peer %s: withdraw error: %v", peer.PeerIP, err))
-			continue
-		}
-	}
-
-	// Return aggregated errors if any peer failed
-	if len(errs) > 0 {
-		return fmt.Errorf("withdrawal errors: %v", errs)
-	}
-	return nil
 }
 
-func (c *Controller) PeerInfo() ([]*api.Peer, error) {
+func (c *Controller) PeerInfo() (*api.Peer, error) {
-	var peers []*api.Peer
+	var peer *api.Peer
-	peerMap := make(map[string]bool)
-
-	// Build map of configured peer IPs
-	for _, peer := range c.peers {
-		peerMap[peer.PeerIP] = true
-	}
-
-	// Collect info for all configured peers
 	err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{}, func(p *api.Peer) {
-		if peerMap[p.Conf.NeighborAddress] {
+		if p.Conf.NeighborAddress == c.peerIP.String() {
-			peers = append(peers, p)
+			peer = p
 		}
 	})
 	if err != nil {
 		return nil, err
 	}
-	return peers, nil
+	return peer, nil
 }
 
 func (c *Controller) Shutdown() error {
-	var errs []error
-
-	// Shutdown all peer sessions
-	for _, peer := range c.peers {
 	if err := c.s.ShutdownPeer(context.Background(), &api.ShutdownPeerRequest{
-			Address: peer.PeerIP,
+		Address: c.peerIP.String(),
 	}); err != nil {
-			errs = append(errs, fmt.Errorf("peer %s: shutdown error: %v", peer.PeerIP, err))
+		return err
 	}
-	}
-
-	// Stop BGP server
 	if err := c.s.StopBgp(context.Background(), &api.StopBgpRequest{}); err != nil {
-		errs = append(errs, fmt.Errorf("stop bgp error: %v", err))
+		return err
-	}
-
-	if len(errs) > 0 {
-		return fmt.Errorf("shutdown errors: %v", errs)
 	}
 	return nil
 }

controller/bgp_test.go

@@ -102,578 +102,3 @@ func TestBgpNew(t *testing.T) {
 	a.Equal("20.30.40.0/24", path)
 	ctrl.Shutdown()
 }
-
-func TestLegacyConfigConversion(t *testing.T) {
-	a := assert.New(t)
-
-	// Test legacy single-peer config
-	legacyConfig := config.BgpConfig{
-		LocalAS: 11111,
-		PeerAS:  22222,
-		PeerIP:  "10.10.10.1",
-		LocalIP: "192.168.1.100",
-		Communities: []string{"100:100"},
-		Origin: "igp",
-	}
-
-	ctrl, err := NewController(legacyConfig)
-	if err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.Shutdown()
-
-	// Verify legacy config was converted to multi-peer format
-	a.Equal(1, len(ctrl.peers), "Should have exactly 1 peer")
-	a.Equal("10.10.10.1", ctrl.peers[0].PeerIP)
-	a.Equal(22222, ctrl.peers[0].PeerAS)
-}
-
-func TestMultiPeerConfig(t *testing.T) {
-	a := assert.New(t)
-
-	// Test new multi-peer config
-	multiPeerConfig := config.BgpConfig{
-		LocalAS: 11111,
-		LocalIP: "192.168.1.100",
-		Peers: []config.PeerConfig{
-			{PeerIP: "10.10.10.1", PeerAS: 22222},
-			{PeerIP: "10.10.10.2", PeerAS: 22222},
-		},
-		Communities: []string{"100:100"},
-		Origin: "igp",
-	}
-
-	ctrl, err := NewController(multiPeerConfig)
-	if err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.Shutdown()
-
-	// Verify both peers are configured
-	a.Equal(2, len(ctrl.peers), "Should have exactly 2 peers")
-	a.Equal("10.10.10.1", ctrl.peers[0].PeerIP)
-	a.Equal("10.10.10.2", ctrl.peers[1].PeerIP)
-}
-
-func TestDefaultGatewayPeer(t *testing.T) {
-	a := assert.New(t)
-
-	// Test config with no peer_ip - should use default gateway
-	defaultGatewayConfig := config.BgpConfig{
-		LocalAS: 11111,
-		LocalIP: "192.168.1.100",
-		PeerAS:  22222,
-		Origin:  "igp",
-	}
-
-	ctrl, err := NewController(defaultGatewayConfig)
-	a.NoError(err, "Should not error when peer_ip is not specified")
-	if err == nil {
-		defer ctrl.Shutdown()
-
-		// Verify a peer was configured using gateway
-		a.Equal(1, len(ctrl.peers), "Should have exactly 1 peer")
-		a.NotEmpty(ctrl.peers[0].PeerIP, "Peer IP should be set from gateway")
-		a.Equal(22222, ctrl.peers[0].PeerAS, "Peer AS should match config")
-	}
-}
-
-func TestCommunityMerging(t *testing.T) {
-	a := assert.New(t)
-
-	ctrl := &Controller{
-		localAS: 11111,
-		localIP: net.ParseIP("192.168.1.100"),
-		communities: []string{"1000:1000", "2000:2000"}, // Global
-		origin: 0,
-	}
-
-	peer := &config.PeerConfig{
-		PeerIP: "10.10.10.1",
-		PeerAS: 22222,
-		Communities: []string{"100:100", "200:200"}, // Per-peer
-	}
-
-	route := &Route{
-		Net: &net.IPNet{
-			IP: net.ParseIP("20.30.40.0"),
-			Mask: net.CIDRMask(24, 32),
-		},
-		Communities: []string{"5000:5000"}, // Per-route
-	}
-
-	path := ctrl.getApiPath(route, peer)
-
-	// Extract communities from path
-	var commAttr *api.CommunitiesAttribute
-	for _, attr := range path.Pattrs {
-		var dynAny ptypes.DynamicAny
-		if err := ptypes.UnmarshalAny(attr, &dynAny); err == nil {
-			if c, ok := dynAny.Message.(*api.CommunitiesAttribute); ok {
-				commAttr = c
-				break
-			}
-		}
-	}
-
-	a.NotNil(commAttr, "Should have communities attribute")
-	a.Equal(5, len(commAttr.Communities), "Should have 5 communities (2 global + 2 peer + 1 route)")
-
-	// Verify community values (converted to uint32)
-	expectedCommunities := []uint32{
-		convertCommunity("1000:1000"), // Global
-		convertCommunity("2000:2000"), // Global
-		convertCommunity("100:100"),   // Per-peer
-		convertCommunity("200:200"),   // Per-peer
-		convertCommunity("5000:5000"), // Per-route
-	}
-	a.Equal(expectedCommunities, commAttr.Communities)
-}
-
-func TestMultiHopConfiguration(t *testing.T) {
-	a := assert.New(t)
-
-	testCases := []struct {
-		name         string
-		localAS      int
-		peerAS       int
-		multiHopPtr  *bool
-		expectMH     bool
-	}{
-		{
-			name:        "default - multihop not enabled",
-			localAS:     11111,
-			peerAS:      22222,
-			multiHopPtr: nil,
-			expectMH:    false,
-		},
-		{
-			name:        "explicit disable",
-			localAS:     11111,
-			peerAS:      22222,
-			multiHopPtr: boolPtr(false),
-			expectMH:    false,
-		},
-		{
-			name:        "explicit enable",
-			localAS:     11111,
-			peerAS:      22222,
-			multiHopPtr: boolPtr(true),
-			expectMH:    true,
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			ctrl := &Controller{
-				localAS: tc.localAS,
-				localIP: net.ParseIP("192.168.1.100"),
-				s:       gobgp.NewBgpServer(),
-			}
-			go ctrl.s.Serve()
-
-			if err := ctrl.s.StartBgp(context.Background(), &api.StartBgpRequest{
-				Global: &api.Global{
-					As:         uint32(tc.localAS),
-					RouterId:   ctrl.localIP.String(),
-					ListenPort: -1,
-				},
-			}); err != nil {
-				a.FailNow(err.Error())
-			}
-			defer ctrl.s.StopBgp(context.Background(), &api.StopBgpRequest{})
-
-			peer := &config.PeerConfig{
-				PeerIP:   "10.10.10.1",
-				PeerAS:   tc.peerAS,
-				MultiHop: tc.multiHopPtr,
-			}
-
-			err := ctrl.addPeer(peer)
-			a.NoError(err)
-
-			// Verify multihop setting by checking peer config
-			var foundPeer *api.Peer
-			ctrl.s.ListPeer(context.Background(), &api.ListPeerRequest{}, func(p *api.Peer) {
-				if p.Conf.NeighborAddress == peer.PeerIP {
-					foundPeer = p
-				}
-			})
-
-			a.NotNil(foundPeer, "Peer should be added")
-			if tc.expectMH {
-				a.NotNil(foundPeer.EbgpMultihop, "Should have multihop configured")
-				a.True(foundPeer.EbgpMultihop.Enabled, "Multihop should be enabled")
-			} else {
-				if foundPeer.EbgpMultihop != nil {
-					a.False(foundPeer.EbgpMultihop.Enabled, "Multihop should not be enabled")
-				}
-			}
-		})
-	}
-}
-
-// Helper function to create bool pointer
-func boolPtr(b bool) *bool {
-	return &b
-}
-
-func TestMultiPeerAnnouncement(t *testing.T) {
-	if os.Getenv("CI") != "" {
-		t.Skip("Skipping testing in CI environment")
-	}
-
-	a := assert.New(t)
-
-	// Create two BGP listeners
-	listener1, err := NewBgpListener(22222)
-	if err != nil {
-		panic(err)
-	}
-	defer listener1.Shutdown()
-
-	listener2, err := NewBgpListener(33333)
-	if err != nil {
-		panic(err)
-	}
-	defer listener2.Shutdown()
-
-	// Create controller with two peers
-	multiPeerConfig := config.BgpConfig{
-		LocalAS: 11111,
-		LocalIP: "192.168.1.100",
-		Peers: []config.PeerConfig{
-			{PeerIP: "127.0.0.1", PeerAS: 22222},
-			{PeerIP: "127.0.0.1", PeerAS: 33333},
-		},
-		Communities: []string{"100:100"},
-		Origin:      "igp",
-	}
-
-	ctrl, err := NewController(multiPeerConfig)
-	if err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.Shutdown()
-
-	// Announce a route
-	_, ipnet, _ := net.ParseCIDR("20.30.40.0/24")
-	r := &Route{Net: ipnet}
-	if err := ctrl.Announce(r); err != nil {
-		a.FailNow(err.Error())
-	}
-
-	// Verify both listeners received the route
-	path1 := <-listener1.recvdPaths
-	a.Equal("20.30.40.0/24", path1)
-
-	path2 := <-listener2.recvdPaths
-	a.Equal("20.30.40.0/24", path2)
-}
-
-func TestBestEffortAnnouncement(t *testing.T) {
-	a := assert.New(t)
-
-	// Create controller with two peers
-	mixedConfig := config.BgpConfig{
-		LocalAS: 11111,
-		LocalIP: "192.168.1.100",
-		Peers: []config.PeerConfig{
-			{PeerIP: "127.0.0.1", PeerAS: 22222},
-			{PeerIP: "127.0.0.2", PeerAS: 33333},
-		},
-		Origin: "igp",
-	}
-
-	ctrl, err := NewController(mixedConfig)
-	if err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.Shutdown()
-
-	// Announce a route - both peers will be added successfully
-	// (they won't have actual BGP sessions established, but peers are added to GoBGP)
-	_, ipnet, _ := net.ParseCIDR("20.30.40.0/24")
-	r := &Route{Net: ipnet}
-
-	// The announcement should succeed for both peers being added
-	err = ctrl.Announce(r)
-	a.NoError(err, "Announcement should succeed for both peers")
-
-	// Verify both peers were added
-	peers, err := ctrl.PeerInfo()
-	a.NoError(err)
-	a.Equal(2, len(peers), "Should have both peers configured")
-}
-
-func TestWithdrawMultiplePeers(t *testing.T) {
-	a := assert.New(t)
-
-	ctrl := &Controller{
-		localAS: 11111,
-		localIP: net.ParseIP("192.168.1.100"),
-		peers: []config.PeerConfig{
-			{PeerIP: "10.10.10.1", PeerAS: 22222},
-			{PeerIP: "10.10.10.2", PeerAS: 22222},
-		},
-		origin: 0,
-		s:      gobgp.NewBgpServer(),
-	}
-	go ctrl.s.Serve()
-
-	if err := ctrl.s.StartBgp(context.Background(), &api.StartBgpRequest{
-		Global: &api.Global{
-			As:         uint32(11111),
-			RouterId:   ctrl.localIP.String(),
-			ListenPort: -1,
-		},
-	}); err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.s.StopBgp(context.Background(), &api.StopBgpRequest{})
-
-	_, ipnet, _ := net.ParseCIDR("20.30.40.0/24")
-	r := &Route{Net: ipnet}
-
-	// Withdraw should iterate through all peers
-	// This will fail because peers aren't established, but it should try both
-	err := ctrl.Withdraw(r)
-	// We expect an error but it should have tried both peers
-	if err != nil {
-		a.Contains(err.Error(), "withdrawal errors")
-	}
-}
-
-func TestPeerInfoMultiplePeers(t *testing.T) {
-	a := assert.New(t)
-
-	ctrl := &Controller{
-		localAS: 11111,
-		localIP: net.ParseIP("192.168.1.100"),
-		peers: []config.PeerConfig{
-			{PeerIP: "10.10.10.1", PeerAS: 22222},
-			{PeerIP: "10.10.10.2", PeerAS: 33333},
-		},
-		origin: 0,
-		s:      gobgp.NewBgpServer(),
-	}
-	go ctrl.s.Serve()
-
-	if err := ctrl.s.StartBgp(context.Background(), &api.StartBgpRequest{
-		Global: &api.Global{
-			As:         uint32(11111),
-			RouterId:   ctrl.localIP.String(),
-			ListenPort: -1,
-		},
-	}); err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.s.StopBgp(context.Background(), &api.StopBgpRequest{})
-
-	// Add peers
-	for i := range ctrl.peers {
-		ctrl.addPeer(&ctrl.peers[i])
-	}
-
-	// Get peer info
-	peers, err := ctrl.PeerInfo()
-	a.NoError(err)
-	a.Equal(2, len(peers), "Should return info for both peers")
-
-	// Verify peer addresses
-	peerAddrs := make(map[string]bool)
-	for _, p := range peers {
-		peerAddrs[p.Conf.NeighborAddress] = true
-	}
-	a.True(peerAddrs["10.10.10.1"], "Should have first peer")
-	a.True(peerAddrs["10.10.10.2"], "Should have second peer")
-}
-
-func TestMD5Authentication(t *testing.T) {
-	a := assert.New(t)
-
-	testCases := []struct {
-		name           string
-		md5Password    string
-		md5EnvVar      string
-		envValue       string
-		expectedAuth   string
-	}{
-		{
-			name:         "MD5 password from config",
-			md5Password:  "secret123",
-			md5EnvVar:    "",
-			envValue:     "",
-			expectedAuth: "secret123",
-		},
-		{
-			name:         "MD5 password from environment variable",
-			md5Password:  "",
-			md5EnvVar:    "BGP_PEER_PASSWORD",
-			envValue:     "env_secret456",
-			expectedAuth: "env_secret456",
-		},
-		{
-			name:         "Environment variable takes priority over config",
-			md5Password:  "config_password",
-			md5EnvVar:    "BGP_PEER_PASSWORD",
-			envValue:     "env_password",
-			expectedAuth: "env_password",
-		},
-		{
-			name:         "No authentication when neither is set",
-			md5Password:  "",
-			md5EnvVar:    "",
-			envValue:     "",
-			expectedAuth: "",
-		},
-		{
-			name:         "Config password used when env var is set but empty",
-			md5Password:  "fallback_password",
-			md5EnvVar:    "EMPTY_VAR",
-			envValue:     "",
-			expectedAuth: "fallback_password",
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			// Set environment variable if specified
-			if tc.md5EnvVar != "" && tc.envValue != "" {
-				os.Setenv(tc.md5EnvVar, tc.envValue)
-				defer os.Unsetenv(tc.md5EnvVar)
-			}
-
-			ctrl := &Controller{
-				localAS: 11111,
-				localIP: net.ParseIP("192.168.1.100"),
-				s:       gobgp.NewBgpServer(),
-			}
-			go ctrl.s.Serve()
-
-			if err := ctrl.s.StartBgp(context.Background(), &api.StartBgpRequest{
-				Global: &api.Global{
-					As:         uint32(11111),
-					RouterId:   ctrl.localIP.String(),
-					ListenPort: -1,
-				},
-			}); err != nil {
-				a.FailNow(err.Error())
-			}
-			defer ctrl.s.StopBgp(context.Background(), &api.StopBgpRequest{})
-
-			peer := &config.PeerConfig{
-				PeerIP:      "10.10.10.1",
-				PeerAS:      22222,
-				MD5Password: tc.md5Password,
-				MD5EnvVar:   tc.md5EnvVar,
-			}
-
-			err := ctrl.addPeer(peer)
-			a.NoError(err)
-
-			// Verify MD5 authentication is configured correctly
-			var foundPeer *api.Peer
-			ctrl.s.ListPeer(context.Background(), &api.ListPeerRequest{}, func(p *api.Peer) {
-				if p.Conf.NeighborAddress == peer.PeerIP {
-					foundPeer = p
-				}
-			})
-
-			a.NotNil(foundPeer, "Peer should be added")
-			a.Equal(tc.expectedAuth, foundPeer.Conf.AuthPassword, "MD5 password should match expected")
-		})
-	}
-}
-
-func TestGetMD5Password(t *testing.T) {
-	a := assert.New(t)
-
-	ctrl := &Controller{}
-
-	// Test 1: Environment variable takes priority
-	os.Setenv("TEST_BGP_PASS", "env_password")
-	defer os.Unsetenv("TEST_BGP_PASS")
-
-	peer := &config.PeerConfig{
-		MD5Password: "config_password",
-		MD5EnvVar:   "TEST_BGP_PASS",
-	}
-	a.Equal("env_password", ctrl.getMD5Password(peer))
-
-	// Test 2: Config password when env var not set
-	peer2 := &config.PeerConfig{
-		MD5Password: "config_only",
-		MD5EnvVar:   "NONEXISTENT_VAR",
-	}
-	a.Equal("config_only", ctrl.getMD5Password(peer2))
-
-	// Test 3: Empty string when nothing is set
-	peer3 := &config.PeerConfig{}
-	a.Equal("", ctrl.getMD5Password(peer3))
-
-	// Test 4: Only env var specified
-	os.Setenv("ANOTHER_PASS", "another_env_password")
-	defer os.Unsetenv("ANOTHER_PASS")
-
-	peer4 := &config.PeerConfig{
-		MD5EnvVar: "ANOTHER_PASS",
-	}
-	a.Equal("another_env_password", ctrl.getMD5Password(peer4))
-}
-
-func TestMultiPeerWithMD5(t *testing.T) {
-	a := assert.New(t)
-
-	// Set environment variables for testing
-	os.Setenv("PEER1_PASSWORD", "peer1_secret")
-	os.Setenv("PEER2_PASSWORD", "peer2_secret")
-	defer os.Unsetenv("PEER1_PASSWORD")
-	defer os.Unsetenv("PEER2_PASSWORD")
-
-	// Create controller with multiple peers using different MD5 configurations
-	multiPeerConfig := config.BgpConfig{
-		LocalAS: 11111,
-		LocalIP: "192.168.1.100",
-		Peers: []config.PeerConfig{
-			{
-				PeerIP:      "10.10.10.1",
-				PeerAS:      22222,
-				MD5EnvVar:   "PEER1_PASSWORD",
-			},
-			{
-				PeerIP:      "10.10.10.2",
-				PeerAS:      33333,
-				MD5Password: "peer2_config_password",
-			},
-			{
-				PeerIP:   "10.10.10.3",
-				PeerAS:   44444,
-				// No MD5 authentication
-			},
-		},
-		Origin: "igp",
-	}
-
-	ctrl, err := NewController(multiPeerConfig)
-	if err != nil {
-		a.FailNow(err.Error())
-	}
-	defer ctrl.Shutdown()
-
-	// Trigger peer addition by announcing a route (peers are added lazily)
-	_, ipnet, _ := net.ParseCIDR("20.30.40.0/24")
-	r := &Route{Net: ipnet}
-	ctrl.Announce(r)
-
-	// Verify all peers have correct MD5 configuration
-	peers := make(map[string]string) // map[peerIP]authPassword
-	ctrl.s.ListPeer(context.Background(), &api.ListPeerRequest{}, func(p *api.Peer) {
-		peers[p.Conf.NeighborAddress] = p.Conf.AuthPassword
-	})
-
-	a.Equal(3, len(peers), "Should have all three peers")
-	a.Equal("peer1_secret", peers["10.10.10.1"], "First peer should use env var password")
-	a.Equal("peer2_config_password", peers["10.10.10.2"], "Second peer should use config password")
-	a.Equal("", peers["10.10.10.3"], "Third peer should have no authentication")
-}

controller/consul.go

@@ -17,7 +17,7 @@ const (
 	consulNodeEnv        = "CONSUL_NODE"
 	consulToken          = "CONSUL_TOKEN"
 	allowStale           = "CONSUL_STALE"
-	matchTag             = "enable_gocast"
+	defaultmatchTag      = "enable_gocast"
 	nodeURL              = "/catalog/node"
 	remoteHealthCheckurl = "/health/checks"
 	localHealthCheckurl  = "/agent/checks"
@@ -35,6 +35,7 @@ type ConsulMon struct {
 	addr     string
 	token    string
 	node     string
+	matchTag string
 	client   Clienter
 }
 
@@ -55,12 +56,15 @@ func contains(inp []string, elem string) bool {
 	return false
 }
 
-func NewConsulMon(addr string, token string) (*ConsulMon, error) {
+func NewConsulMon(addr string, token string, matchTag string) (*ConsulMon, error) {
 	node := os.Getenv(consulNodeEnv)
 	if node == "" {
 		return nil, fmt.Errorf("%s env variable not set", consulNodeEnv)
 	}
-	return &ConsulMon{addr: addr, token: token, node: node, client: &http.Client{Timeout: 10 * time.Second}}, nil
+	if matchTag == "" {
+		matchTag = defaultmatchTag
+	}
+	return &ConsulMon{addr: addr, token: token, node: node, client: &http.Client{Timeout: 10 * time.Second}, matchTag: matchTag}, nil
 }
 
 func getHTTPReq(httpMethod string, addr string, tokenFrmCfg string) (*http.Request, error) {
@@ -95,10 +99,10 @@ func (c *ConsulMon) queryServices() ([]*App, error) {
 	defer resp.Body.Close()
 	var consulData ConsulServiceData
 	if err := json.NewDecoder(resp.Body).Decode(&consulData); err != nil {
-		return apps, fmt.Errorf("Unable to decode consul data: %v", err)
+		return apps, fmt.Errorf("unable to decode consul data: %v", err)
 	}
 	for _, service := range consulData.Services {
-		if !contains(service.Tags, matchTag) {
+		if !contains(service.Tags, c.matchTag) {
 			continue
 		}
 		var (
@@ -170,7 +174,7 @@ func (c *ConsulMon) healthCheckLocal(service string) (bool, error) {
 			return false, nil
 		}
 	}
-	return false, fmt.Errorf("No local healthcheck info found for service %s on node %s in consul", service, c.node)
+	return false, fmt.Errorf("no local healthcheck info found for service %s on node %s in consul", service, c.node)
 }
 
 // healthCheckRemote queries the consul cluster's healthcheck endpoint to perform service healthchecks
@@ -202,7 +206,7 @@ func (c *ConsulMon) healthCheckRemote(service string) (bool, error) {
 			return false, nil
 		}
 	}
-	return false, fmt.Errorf("No healthcheck info found for node %s in consul", c.node)
+	return false, fmt.Errorf("no healthcheck info found for node %s in consul", c.node)
 }
 
 // healthCheck determines if we should use the local agent

controller/consul_test.go

@@ -2,7 +2,7 @@ package controller
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"testing"
@@ -119,13 +119,13 @@ func TestQueryServices(t *testing.T) {
 	a := assert.New(t)
 	client := &MockClient{}
 	cm := &ConsulMon{
-		addr: "foo", node: "test", client: client,
+		addr: "foo", node: "test", client: client, matchTag: "enable_gocast",
 	}
 
 	// test valid app
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulData["single-app"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	apps, err := cm.queryServices()
 	if err != nil {
@@ -140,7 +140,7 @@ func TestQueryServices(t *testing.T) {
 	// test no match
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulData["single-app-no-match"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	apps, err = cm.queryServices()
 	if err != nil {
@@ -151,7 +151,7 @@ func TestQueryServices(t *testing.T) {
 	// test missing vip
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulData["single-app-no-vip"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	apps, _ = cm.queryServices()
 	a.Equal(0, len(apps))
@@ -160,13 +160,13 @@ func TestQueryServices(t *testing.T) {
 func TestHealthCheck(t *testing.T) {
 	a := assert.New(t)
 	client := &MockClient{}
-	cm := &ConsulMon{node: "test-node1", client: client}
+	cm := &ConsulMon{node: "test-node1", client: client, matchTag: "enable_gocast"}
 
 	// test remote checks
 	cm.addr = "http://remote/check"
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulCheckData["remote-pass"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	check, err := cm.healthCheck("test-service")
 	if err != nil {
@@ -175,7 +175,7 @@ func TestHealthCheck(t *testing.T) {
 	a.True(check)
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulCheckData["remote-fail"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	check, _ = cm.healthCheck("test-service")
 	a.False(check)
@@ -184,7 +184,7 @@ func TestHealthCheck(t *testing.T) {
 	cm.addr = "http://localhost/check"
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulCheckData["local-pass"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	check, _ = cm.healthCheck("test-service")
 	if err != nil {
@@ -194,7 +194,7 @@ func TestHealthCheck(t *testing.T) {
 	cm.addr = "http://127.0.0.1/check"
 	client.do = func(*http.Request) (*http.Response, error) {
 		b := bytes.NewBuffer([]byte(mockConsulCheckData["local-fail"]))
-		return &http.Response{Body: ioutil.NopCloser(b), StatusCode: http.StatusOK}, nil
+		return &http.Response{Body: io.NopCloser(b), StatusCode: http.StatusOK}, nil
 	}
 	check, _ = cm.healthCheck("test-service")
 	a.False(check)

controller/monitor.go

@@ -84,7 +84,7 @@ func NewMonitor(config *c.Config) *MonitorMgr {
 		cleanups: make(map[string]chan bool),
 	}
 	if config.Agent.ConsulAddr != "" {
-		cmon, err := NewConsulMon(config.Agent.ConsulAddr, config.Agent.ConsulToken)
+		cmon, err := NewConsulMon(config.Agent.ConsulAddr, config.Agent.ConsulToken, config.Agent.ConsulMatchTag)
 		if err != nil {
 			glog.Errorf("Failed to start consul monitor: %v", err)
 		} else {
@@ -184,7 +184,7 @@ func (m *MonitorMgr) Add(app *App) {
 }
 
 // Remove removes an app from monitor manager, stops BGP
-/// announcement and cleans up state
+// / announcement and cleans up state
 func (m *MonitorMgr) Remove(appName string) {
 	m.monMu.Lock()
 	defer m.monMu.Unlock()
@@ -339,231 +339,6 @@ func (m *MonitorMgr) CloseAll() {
 	}
 }
 
-// Reload re-reads the configuration file and applies changes
-func (m *MonitorMgr) Reload(configPath string) error {
-	glog.Infof("Reloading configuration from %s", configPath)
-
-	// Read new configuration
-	newConfig := c.GetConfig(configPath)
-	if newConfig == nil {
-		return fmt.Errorf("Failed to load configuration")
-	}
-
-	// Set defaults if not specified
-	if newConfig.Agent.MonitorInterval == 0 {
-		newConfig.Agent.MonitorInterval = defaultMonitorInterval
-	}
-	if newConfig.Agent.CleanupTimer == 0 {
-		newConfig.Agent.CleanupTimer = defaultCleanupTimer
-	}
-
-	// Check if BGP configuration has changed
-	bgpChanged := m.bgpConfigChanged(m.config.Bgp, newConfig.Bgp)
-
-	if bgpChanged {
-		glog.Infof("BGP configuration changed, restarting BGP controller")
-
-		// Withdraw all current routes before shutting down
-		m.monMu.Lock()
-		for _, am := range m.monitors {
-			if am.announced {
-				if err := m.ctrl.Withdraw(am.app.Vip); err != nil {
-					glog.Errorf("Failed to withdraw route during reload: %v", err)
-				}
-				am.announced = false
-			}
-		}
-		m.monMu.Unlock()
-
-		// Shutdown old BGP controller
-		if err := m.ctrl.Shutdown(); err != nil {
-			glog.Errorf("Failed to shutdown BGP controller: %v", err)
-		}
-
-		// Start new BGP controller
-		ctrl, err := NewController(newConfig.Bgp)
-		if err != nil {
-			return fmt.Errorf("Failed to start new BGP controller: %v", err)
-		}
-		m.ctrl = ctrl
-
-		// Re-announce all routes with new BGP config
-		m.monMu.Lock()
-		for _, am := range m.monitors {
-			// Only re-announce if the app was previously announced and is still healthy
-			if m.runMonitors(am.app) {
-				if err := m.ctrl.Announce(am.app.Vip); err != nil {
-					glog.Errorf("Failed to re-announce route %s: %v", am.app.Vip.Net.String(), err)
-				} else {
-					am.announced = true
-					glog.Infof("Re-announced route %s", am.app.Vip.Net.String())
-				}
-			}
-		}
-		m.monMu.Unlock()
-	}
-
-	// Handle consul configuration changes
-	if m.config.Agent.ConsulAddr != newConfig.Agent.ConsulAddr ||
-	   m.config.Agent.ConsulToken != newConfig.Agent.ConsulToken {
-		glog.Infof("Consul configuration changed")
-		if newConfig.Agent.ConsulAddr != "" {
-			cmon, err := NewConsulMon(newConfig.Agent.ConsulAddr, newConfig.Agent.ConsulToken)
-			if err != nil {
-				glog.Errorf("Failed to start consul monitor: %v", err)
-			} else {
-				m.consul = cmon
-				// Start consul monitoring in background if not already running
-				if m.config.Agent.ConsulAddr == "" {
-					go m.consulMon()
-				}
-			}
-		}
-	}
-
-	// Update agent configuration
-	oldConfig := m.config
-	m.config = newConfig
-
-	// Handle app configuration changes
-	m.reloadApps(oldConfig.Apps, newConfig.Apps)
-
-	glog.Infof("Configuration reloaded successfully")
-	return nil
-}
-
-// bgpConfigChanged checks if BGP configuration has changed
-func (m *MonitorMgr) bgpConfigChanged(old, new c.BgpConfig) bool {
-	// Check basic parameters
-	if old.LocalAS != new.LocalAS || old.LocalIP != new.LocalIP || old.Origin != new.Origin {
-		return true
-	}
-
-	// Check legacy peer config
-	if old.PeerAS != new.PeerAS || old.PeerIP != new.PeerIP {
-		return true
-	}
-
-	// Check peers
-	if len(old.Peers) != len(new.Peers) {
-		return true
-	}
-
-	// Compare each peer
-	for i := range old.Peers {
-		if old.Peers[i].PeerIP != new.Peers[i].PeerIP ||
-			old.Peers[i].PeerAS != new.Peers[i].PeerAS ||
-			old.Peers[i].MD5Password != new.Peers[i].MD5Password ||
-			old.Peers[i].MD5EnvVar != new.Peers[i].MD5EnvVar {
-			return true
-		}
-
-		// Check multi-hop
-		if (old.Peers[i].MultiHop == nil) != (new.Peers[i].MultiHop == nil) {
-			return true
-		}
-		if old.Peers[i].MultiHop != nil && new.Peers[i].MultiHop != nil {
-			if *old.Peers[i].MultiHop != *new.Peers[i].MultiHop {
-				return true
-			}
-		}
-
-		// Check communities
-		if len(old.Peers[i].Communities) != len(new.Peers[i].Communities) {
-			return true
-		}
-		for j := range old.Peers[i].Communities {
-			if old.Peers[i].Communities[j] != new.Peers[i].Communities[j] {
-				return true
-			}
-		}
-	}
-
-	// Check global communities
-	if len(old.Communities) != len(new.Communities) {
-		return true
-	}
-	for i := range old.Communities {
-		if old.Communities[i] != new.Communities[i] {
-			return true
-		}
-	}
-
-	return false
-}
-
-// reloadApps compares old and new app configurations and applies changes
-func (m *MonitorMgr) reloadApps(oldApps, newApps []c.AppConfig) {
-	// Build maps for easy comparison
-	oldAppMap := make(map[string]c.AppConfig)
-	for _, app := range oldApps {
-		oldAppMap[app.Name] = app
-	}
-
-	newAppMap := make(map[string]c.AppConfig)
-	for _, app := range newApps {
-		newAppMap[app.Name] = app
-	}
-
-	// Remove apps that are no longer in config
-	for name := range oldAppMap {
-		if _, exists := newAppMap[name]; !exists {
-			m.monMu.Lock()
-			if am, ok := m.monitors[name]; ok {
-				if am.app.Source == "config" {
-					glog.Infof("Removing app %s (no longer in config)", name)
-					m.monMu.Unlock()
-					m.Remove(name)
-					continue
-				}
-			}
-			m.monMu.Unlock()
-		}
-	}
-
-	// Add new apps or update existing ones
-	for name, newAppConfig := range newAppMap {
-		oldAppConfig, existed := oldAppMap[name]
-
-		// Check if app configuration changed
-		configChanged := !existed ||
-			oldAppConfig.Vip != newAppConfig.Vip ||
-			!equalStringSlices(oldAppConfig.Monitors, newAppConfig.Monitors) ||
-			!equalStringSlices(oldAppConfig.Nats, newAppConfig.Nats) ||
-			!equalStringSlices(oldAppConfig.VipConfig.BgpCommunities, newAppConfig.VipConfig.BgpCommunities)
-
-		if configChanged {
-			if existed {
-				glog.Infof("App %s configuration changed, reloading", name)
-				m.Remove(name)
-			} else {
-				glog.Infof("Adding new app %s from config", name)
-			}
-
-			app, err := NewApp(newAppConfig.Name, newAppConfig.Vip, newAppConfig.VipConfig,
-				newAppConfig.Monitors, newAppConfig.Nats, "config")
-			if err != nil {
-				glog.Errorf("Failed to add app %s: %v", name, err)
-				continue
-			}
-			m.Add(app)
-		}
-	}
-}
-
-// equalStringSlices compares two string slices
-func equalStringSlices(a, b []string) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for i := range a {
-		if a[i] != b[i] {
-			return false
-		}
-	}
-	return true
-}
-
 // CleanUp periodically monitors for stale apps and cleans them up
 func (m *MonitorMgr) Cleanup(app string, exit chan bool) {
 	t := time.NewTimer(m.config.Agent.CleanupTimer)
@@ -581,6 +356,6 @@ func (m *MonitorMgr) Cleanup(app string, exit chan bool) {
 }
 
 // GetInfo returns basic BGP info for established peers
-func (m *MonitorMgr) GetInfo() ([]*api.Peer, error) {
+func (m *MonitorMgr) GetInfo() (*api.Peer, error) {
 	return m.ctrl.PeerInfo()
 }

controller/reload_test.go

@@ -1,293 +0,0 @@
-package controller
-
-import (
-	"io/ioutil"
-	"os"
-	"testing"
-	"time"
-
-	config "github.com/mayuresh82/gocast/config"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestBgpConfigChanged(t *testing.T) {
-	a := assert.New(t)
-
-	mon := &MonitorMgr{}
-
-	// Test 1: No changes
-	cfg1 := config.BgpConfig{
-		LocalAS: 12345,
-		LocalIP: "192.168.1.100",
-		Origin:  "igp",
-		Peers: []config.PeerConfig{
-			{PeerIP: "10.10.10.1", PeerAS: 6789},
-		},
-		Communities: []string{"100:100"},
-	}
-	cfg2 := cfg1
-	a.False(mon.bgpConfigChanged(cfg1, cfg2), "Identical configs should not be considered changed")
-
-	// Test 2: LocalAS changed
-	cfg3 := cfg1
-	cfg3.LocalAS = 54321
-	a.True(mon.bgpConfigChanged(cfg1, cfg3), "LocalAS change should be detected")
-
-	// Test 3: Peer IP changed
-	cfg4 := cfg1
-	cfg4.Peers = []config.PeerConfig{
-		{PeerIP: "10.10.10.2", PeerAS: 6789},
-	}
-	a.True(mon.bgpConfigChanged(cfg1, cfg4), "Peer IP change should be detected")
-
-	// Test 4: MD5 password changed
-	cfg5 := cfg1
-	cfg5.Peers = []config.PeerConfig{
-		{PeerIP: "10.10.10.1", PeerAS: 6789, MD5Password: "secret"},
-	}
-	a.True(mon.bgpConfigChanged(cfg1, cfg5), "MD5 password change should be detected")
-
-	// Test 5: Community added
-	cfg6 := cfg1
-	cfg6.Communities = []string{"100:100", "200:200"}
-	a.True(mon.bgpConfigChanged(cfg1, cfg6), "Community addition should be detected")
-
-	// Test 6: Peer added
-	cfg7 := cfg1
-	cfg7.Peers = []config.PeerConfig{
-		{PeerIP: "10.10.10.1", PeerAS: 6789},
-		{PeerIP: "10.10.10.2", PeerAS: 6789},
-	}
-	a.True(mon.bgpConfigChanged(cfg1, cfg7), "Peer addition should be detected")
-
-	// Test 7: MultiHop changed
-	multiHopTrue := true
-	cfg8 := cfg1
-	cfg8.Peers = []config.PeerConfig{
-		{PeerIP: "10.10.10.1", PeerAS: 6789, MultiHop: &multiHopTrue},
-	}
-	a.True(mon.bgpConfigChanged(cfg1, cfg8), "MultiHop change should be detected")
-}
-
-func TestEqualStringSlices(t *testing.T) {
-	a := assert.New(t)
-
-	a.True(equalStringSlices([]string{}, []string{}), "Empty slices should be equal")
-	a.True(equalStringSlices([]string{"a", "b"}, []string{"a", "b"}), "Identical slices should be equal")
-	a.False(equalStringSlices([]string{"a"}, []string{"a", "b"}), "Different length slices should not be equal")
-	a.False(equalStringSlices([]string{"a", "b"}, []string{"a", "c"}), "Different content should not be equal")
-}
-
-func TestReload(t *testing.T) {
-	if os.Getenv("CI") != "" {
-		t.Skip("Skipping reload test in CI environment")
-	}
-
-	a := assert.New(t)
-
-	// Create initial config file
-	initialConfig := `
-agent:
-  listen_addr: :8080
-  monitor_interval: 10s
-  cleanup_timer: 15m
-
-bgp:
-  local_as: 12345
-  peer_as: 6789
-  local_ip: 192.168.1.100
-  origin: igp
-  communities:
-    - 100:100
-
-apps:
-  - name: test-app
-    vip: 1.1.1.1/32
-    monitors:
-      - exec:echo
-`
-
-	// Create temporary config file
-	tmpfile, err := ioutil.TempFile("", "gocast-test-*.yaml")
-	a.NoError(err)
-	defer os.Remove(tmpfile.Name())
-
-	_, err = tmpfile.Write([]byte(initialConfig))
-	a.NoError(err)
-	tmpfile.Close()
-
-	// Initialize monitor with initial config
-	conf := config.GetConfig(tmpfile.Name())
-	mon := NewMonitor(conf)
-	defer mon.CloseAll()
-
-	// Wait a bit for initialization
-	time.Sleep(100 * time.Millisecond)
-
-	// Verify initial state
-	a.Equal(12345, mon.ctrl.localAS)
-	m := mon.monitors["test-app"]
-	a.NotNil(m, "Initial app should be loaded")
-
-	// Update config file with new BGP AS and remove app
-	updatedConfig := `
-agent:
-  listen_addr: :8080
-  monitor_interval: 10s
-  cleanup_timer: 15m
-
-bgp:
-  local_as: 54321
-  peer_as: 6789
-  local_ip: 192.168.1.100
-  origin: igp
-  communities:
-    - 200:200
-`
-
-	err = ioutil.WriteFile(tmpfile.Name(), []byte(updatedConfig), 0644)
-	a.NoError(err)
-
-	// Reload configuration
-	err = mon.Reload(tmpfile.Name())
-	a.NoError(err)
-
-	// Wait for reload to complete
-	time.Sleep(200 * time.Millisecond)
-
-	// Verify new state
-	a.Equal(54321, mon.ctrl.localAS)
-	a.Equal([]string{"200:200"}, mon.ctrl.communities)
-
-	// Verify app was removed
-	mon.monMu.Lock()
-	_, exists := mon.monitors["test-app"]
-	mon.monMu.Unlock()
-	a.False(exists, "App should be removed after reload")
-}
-
-func TestReloadAddApp(t *testing.T) {
-	if os.Getenv("CI") != "" {
-		t.Skip("Skipping reload test in CI environment")
-	}
-
-	a := assert.New(t)
-
-	// Create initial config without apps
-	initialConfig := `
-agent:
-  listen_addr: :8080
-  monitor_interval: 10s
-
-bgp:
-  local_as: 12345
-  peer_as: 6789
-  local_ip: 192.168.1.100
-  origin: igp
-`
-
-	tmpfile, err := ioutil.TempFile("", "gocast-test-*.yaml")
-	a.NoError(err)
-	defer os.Remove(tmpfile.Name())
-
-	_, err = tmpfile.Write([]byte(initialConfig))
-	a.NoError(err)
-	tmpfile.Close()
-
-	conf := config.GetConfig(tmpfile.Name())
-	mon := NewMonitor(conf)
-	defer mon.CloseAll()
-
-	time.Sleep(100 * time.Millisecond)
-
-	// Verify no apps initially
-	mon.monMu.Lock()
-	initialCount := len(mon.monitors)
-	mon.monMu.Unlock()
-	a.Equal(0, initialCount)
-
-	// Add app to config
-	updatedConfig := `
-agent:
-  listen_addr: :8080
-  monitor_interval: 10s
-
-bgp:
-  local_as: 12345
-  peer_as: 6789
-  local_ip: 192.168.1.100
-  origin: igp
-
-apps:
-  - name: new-app
-    vip: 2.2.2.2/32
-    monitors:
-      - exec:echo
-`
-
-	err = ioutil.WriteFile(tmpfile.Name(), []byte(updatedConfig), 0644)
-	a.NoError(err)
-
-	// Reload
-	err = mon.Reload(tmpfile.Name())
-	a.NoError(err)
-
-	time.Sleep(200 * time.Millisecond)
-
-	// Verify app was added
-	mon.monMu.Lock()
-	_, exists := mon.monitors["new-app"]
-	mon.monMu.Unlock()
-	a.True(exists, "New app should be added after reload")
-}
-
-func TestReloadMD5Change(t *testing.T) {
-	if os.Getenv("CI") != "" {
-		t.Skip("Skipping reload test in CI environment")
-	}
-
-	a := assert.New(t)
-
-	// Set environment variable for MD5 password
-	os.Setenv("BGP_TEST_PASSWORD", "initial_secret")
-	defer os.Unsetenv("BGP_TEST_PASSWORD")
-
-	initialConfig := `
-agent:
-  listen_addr: :8080
-
-bgp:
-  local_as: 12345
-  local_ip: 192.168.1.100
-  peers:
-    - peer_ip: 10.10.10.1
-      peer_as: 6789
-      md5_env_var: BGP_TEST_PASSWORD
-  origin: igp
-`
-
-	tmpfile, err := ioutil.TempFile("", "gocast-test-*.yaml")
-	a.NoError(err)
-	defer os.Remove(tmpfile.Name())
-
-	_, err = tmpfile.Write([]byte(initialConfig))
-	a.NoError(err)
-	tmpfile.Close()
-
-	conf := config.GetConfig(tmpfile.Name())
-	mon := NewMonitor(conf)
-	defer mon.CloseAll()
-
-	time.Sleep(100 * time.Millisecond)
-
-	// Update environment variable
-	os.Setenv("BGP_TEST_PASSWORD", "updated_secret")
-
-	// Reload (MD5 env var change should trigger BGP reload)
-	err = mon.Reload(tmpfile.Name())
-	a.NoError(err)
-
-	// Note: We can't easily verify the MD5 password changed without
-	// actually establishing BGP sessions, but we can verify reload succeeded
-	a.NotNil(mon.ctrl)
-}

controller/system.go

@@ -18,22 +18,30 @@ func getCmdList(mainCmd string) []string {
 	return cmdList
 }
 
-func gateway() (net.IP, error) {
+func gateway(family int) (net.IP, error) {
-	cmd := `ip route | grep "^default" | cut -d" " -f3`
+	prefix := "ip"
+	if family == 6 {
+		prefix = "ip -6"
+	}
+	cmd := fmt.Sprintf(`%s route | grep "^default" | cut -d" " -f3`, prefix)
 	cmdList := getCmdList(cmd)
 	out, err := exec.Command(execCmd, cmdList...).Output()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to execute command: %s: %v", cmd, err)
+		return nil, fmt.Errorf("failed to execute command: %s: %v", cmd, err)
 	}
 	return net.ParseIP(strings.TrimSpace(string(out))), nil
 }
 
 func via(dest net.IP) (net.IP, error) {
-	cmd := fmt.Sprintf(`ip route get %s | grep via | cut -d" " -f3`, dest.String())
+	prefix := "ip"
+	if dest.To4() == nil {
+		prefix = "ip -6"
+	}
+	cmd := fmt.Sprintf(`%s route get %s | grep via | cut -d" " -f3`, prefix, dest.String())
 	cmdList := getCmdList(cmd)
 	out, err := exec.Command(execCmd, cmdList...).Output()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to execute command: %s: %v", cmd, err)
+		return nil, fmt.Errorf("failed to execute command: %s: %v", cmd, err)
 	}
 	if string(out) == "" {
 		// assume the provided dest is the next hop
@@ -55,7 +63,7 @@ func localAddress(gw net.IP) (net.IP, error) {
 			}
 		}
 	}
-	return nil, fmt.Errorf("Unable to find local address")
+	return nil, fmt.Errorf("unable to find local address")
 }
 
 func addLoopback(name string, addr *net.IPNet) error {
@@ -66,30 +74,42 @@ func addLoopback(name string, addr *net.IPNet) error {
 	if len(label) > 15 {
 		label = label[:15]
 	}
-	cmd := fmt.Sprintf("ip address add %s/%d dev lo label %s", addr.IP.String(), prefixLen, label)
+	prefix := "ip"
+	if addr.IP.To4() == nil {
+		prefix = "ip -6"
+	}
+	cmd := fmt.Sprintf("%s address add %s/%d dev lo label %s", prefix, addr.IP.String(), prefixLen, label)
 	cmdList := getCmdList(cmd)
 	_, err := exec.Command(execCmd, cmdList...).Output()
 	if err != nil {
-		return fmt.Errorf("Failed to Add loopback command: %s: %v", cmd, err)
+		return fmt.Errorf("failed to Add loopback command: %s: %v", cmd, err)
 	}
 	return nil
 }
 
 func deleteLoopback(addr *net.IPNet) error {
+	prefix := "ip"
+	if addr.IP.To4() == nil {
+		prefix = "ip -6"
+	}
 	prefixLen, _ := addr.Mask.Size()
-	cmd := fmt.Sprintf("ip address delete %s/%d dev lo", addr.IP.String(), prefixLen)
+	cmd := fmt.Sprintf("%s address delete %s/%d dev lo", prefix, addr.IP.String(), prefixLen)
 	cmdList := getCmdList(cmd)
 	_, err := exec.Command(execCmd, cmdList...).Output()
 	if err != nil {
-		return fmt.Errorf("Failed to delete loopback command: %s: %v", cmd, err)
+		return fmt.Errorf("failed to delete loopback command: %s: %v", cmd, err)
 	}
 	return nil
 }
 
 func natRule(op string, vip, localAddr net.IP, protocol, lport, dport string) error {
+	prefix := "iptables"
+	if vip.To4() == nil {
+		prefix = "ip6tables"
+	}
 	cmd := fmt.Sprintf(
-		"iptables -t nat -%s PREROUTING -p %s -d %s --dport %s -j DNAT --to-destination %s:%s",
+		"%s -t nat -%s PREROUTING -p %s -d %s --dport %s -j DNAT --to-destination %s:%s",
-		op, protocol, vip.String(), lport, localAddr.String(), dport,
+		prefix, op, protocol, vip.String(), lport, localAddr.String(), dport,
 	)
 	cmdList := getCmdList(cmd)
 	_, err := exec.Command(execCmd, cmdList...).Output()

controller/system_test.go

@@ -12,9 +12,14 @@ import (
 func TestGateway(t *testing.T) {
 	execCmd = os.Args[0]
 	os.Setenv("test_name", "test_gateway")
-	gw, err := gateway()
+	gw, err := gateway(4)
 	assert.Nil(t, err)
 	assert.Equal(t, "10.1.1.1", gw.String())
+
+	os.Setenv("test_name", "test_gateway_v6")
+	gw, err = gateway(6)
+	assert.Nil(t, err)
+	assert.Equal(t, "2001:dead:beef::1", gw.String())
 }
 
 func TestVia(t *testing.T) {
@@ -28,6 +33,11 @@ func TestVia(t *testing.T) {
 	ip, err = via(net.ParseIP("10.1.4.1"))
 	assert.Nil(t, err)
 	assert.Equal(t, "10.1.4.1", ip.String())
+
+	os.Setenv("test_name", "test_via_v6")
+	ip, err = via(net.ParseIP("2001:dead:beef::100"))
+	assert.Nil(t, err)
+	assert.Equal(t, "2001:dead:beef::1", ip.String())
 }
 
 func TestAddLoopback(t *testing.T) {
@@ -41,14 +51,23 @@ func TestAddLoopback(t *testing.T) {
 	_, ipnet, _ = net.ParseCIDR("1.1.1.1/32")
 	err = addLoopback("test_app", ipnet)
 	assert.NotNil(t, err)
+
+	os.Setenv("test_name", "test_add_v6")
+	_, ipnet, _ = net.ParseCIDR("2001:dead:beef:1001::100/64")
+	err = addLoopback("test_app", ipnet)
+	assert.Nil(t, err)
 }
 
 func TestMain(m *testing.M) {
 	switch os.Getenv("test_name") {
 	case "test_gateway":
 		fmt.Println("10.1.1.1")
+	case "test_gateway_v6":
+		fmt.Println("2001:dead:beef::1")
 	case "test_via":
 		fmt.Println("10.1.2.1")
+	case "test_via_v6":
+		fmt.Println("2001:dead:beef::1")
 	case "test_via_none":
 		break
 	case "test_add_fail":

main.go

@@ -33,16 +33,7 @@ func main() {
 	go func() {
 		for {
 			sig := <-signalChan
-			switch sig {
+			if sig == os.Interrupt || sig == syscall.SIGTERM {
-			case syscall.SIGHUP:
-				log.Info("Received SIGHUP, reloading configuration")
-				if err := mon.Reload(*config); err != nil {
-					log.Errorf("Failed to reload configuration: %v", err)
-				} else {
-					log.Info("Configuration reloaded successfully")
-				}
-			case os.Interrupt, syscall.SIGTERM:
-				log.Info("Received shutdown signal, cleaning up")
 				mon.CloseAll()
 				cancel()
 				return

server/server.go

@@ -72,11 +72,11 @@ func (s *Server) unregisterHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) infoHandler(w http.ResponseWriter, r *http.Request) {
-	peers, err := s.mon.GetInfo()
+	peer, err := s.mon.GetInfo()
 	if err != nil {
 		http.Error(w, fmt.Sprintf("Internal error getting peers: %v", err), http.StatusInternalServerError)
 		return
 	}
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(peers)
+	json.NewEncoder(w).Encode(peer)
 }