remove gopkg

Dockerfile

@@ -1,20 +1,24 @@
-FROM golang:alpine as builder
+FROM golang:1.12-alpine as builder
+
+ENV GO111MODULE=on
+
 RUN apk update && \
     apk upgrade && \
     apk add --no-cache git && \
     apk add make
-RUN mkdir -p /opt/gocast
+RUN mkdir -p /go/src/github.com/mayuresh82/gocast
-RUN mkdir -p /go/src/github.com/mayuresh82
+
-RUN cd /go/src/github.com/mayuresh82 && \
+COPY . /go/src/github.com/mayuresh82/gocast
-    git clone https://github.com/mayuresh82/gocast
+
 WORKDIR /go/src/github.com/mayuresh82/gocast
+
+RUN go mod download
 RUN make
-RUN cp gocast /opt/gocast/
 
 FROM alpine:latest
 RUN apk --no-cache add ca-certificates bash iptables netcat-openbsd sudo
 WORKDIR /root/
-COPY --from=builder /opt/gocast/gocast .
+COPY --from=builder /go/src/github.com/mayuresh82/gocast .
 
 EXPOSE 8080/tcp
 

Gopkg.lock

@@ -1,356 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  branch = "master"
-  digest = "1:c47f4964978e211c6e566596ec6246c329912ea92e9bb99c00798bb4564c5b09"
-  name = "github.com/armon/go-radix"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "1a2de0c21c94309923825da3df33a4381872c795"
-
-[[projects]]
-  branch = "master"
-  digest = "1:8583eab935e3d99d3a7ac489cd2ee7c8e95eecd7c64ab1fc8382746dacaf8563"
-  name = "github.com/dgryski/go-farm"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "2de33835d10275975374b37b2dcfd22c9020a1f5"
-
-[[projects]]
-  digest = "1:975a4480c40f2d0b95e1f83d3ec1aa29a2774e80179e08a9a4ba2aab86721b23"
-  name = "github.com/eapache/channels"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "47238d5aae8c0fefd518ef2bee46290909cf8263"
-  version = "v1.1.0"
-
-[[projects]]
-  digest = "1:444b82bfe35c83bbcaf84e310fb81a1f9ece03edfed586483c869e2c046aef69"
-  name = "github.com/eapache/queue"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "44cc805cf13205b55f69e14bcb69867d1ae92f98"
-  version = "v1.1.0"
-
-[[projects]]
-  digest = "1:abeb38ade3f32a92943e5be54f55ed6d6e3b6602761d74b4aab4c9dd45c18abd"
-  name = "github.com/fsnotify/fsnotify"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "c2828203cd70a50dcccfb2761f8b1f8ceef9a8e9"
-  version = "v1.4.7"
-
-[[projects]]
-  branch = "master"
-  digest = "1:1ba1d79f2810270045c328ae5d674321db34e3aae468eb4233883b473c5c0467"
-  name = "github.com/golang/glog"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "23def4e6c14b4da8ac2ed8007337bc5eb5007998"
-
-[[projects]]
-  branch = "master"
-  digest = "1:c095e448622bb061a09cb718e3dddc59acb624a67756392282374fa091c83343"
-  name = "github.com/golang/protobuf"
-  packages = [
-    "proto",
-    "ptypes",
-    "ptypes/any",
-    "ptypes/duration",
-    "ptypes/empty",
-    "ptypes/timestamp",
-  ]
-  pruneopts = "UT"
-  revision = "7be3631955993a734965532f776bad7093f6fc9d"
-
-[[projects]]
-  digest = "1:c0d19ab64b32ce9fe5cf4ddceba78d5bc9807f0016db6b1183599da3dcc24d10"
-  name = "github.com/hashicorp/hcl"
-  packages = [
-    ".",
-    "hcl/ast",
-    "hcl/parser",
-    "hcl/printer",
-    "hcl/scanner",
-    "hcl/strconv",
-    "hcl/token",
-    "json/parser",
-    "json/scanner",
-    "json/token",
-  ]
-  pruneopts = "UT"
-  revision = "8cb6e5b959231cc1119e43259c4a608f9c51a241"
-  version = "v1.0.0"
-
-[[projects]]
-  digest = "1:65b0a07f85f7b5cc019c26775efc278a155a5dea0a8aa617c980e8308d16bc55"
-  name = "github.com/influxdata/influxdb"
-  packages = [
-    "client/v2",
-    "models",
-    "pkg/escape",
-  ]
-  pruneopts = "UT"
-  revision = "c75cdfdfa6f71a08473fefcec71f6cbcbdef1ff4"
-  version = "v1.6.4"
-
-[[projects]]
-  digest = "1:0a69a1c0db3591fcefb47f115b224592c8dfa4368b7ba9fae509d5e16cdc95c8"
-  name = "github.com/konsorten/go-windows-terminal-sequences"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "5c8c8bd35d3832f5d134ae1e1e375b69a4d25242"
-  version = "v1.0.1"
-
-[[projects]]
-  digest = "1:c568d7727aa262c32bdf8a3f7db83614f7af0ed661474b24588de635c20024c7"
-  name = "github.com/magiconair/properties"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "c2353362d570a7bfa228149c62842019201cfb71"
-  version = "v1.8.0"
-
-[[projects]]
-  digest = "1:53bc4cd4914cd7cd52139990d5170d6dc99067ae31c56530621b18b35fc30318"
-  name = "github.com/mitchellh/mapstructure"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "3536a929edddb9a5b34bd6861dc4a9647cb459fe"
-  version = "v1.1.2"
-
-[[projects]]
-  branch = "master"
-  digest = "1:7261338473c27eea9593dceecf6a949c689f6dbd2226cad46139ab9d5011bc4b"
-  name = "github.com/osrg/gobgp"
-  packages = [
-    "api",
-    "internal/pkg/apiutil",
-    "internal/pkg/config",
-    "internal/pkg/table",
-    "internal/pkg/zebra",
-    "pkg/packet/bgp",
-    "pkg/packet/bmp",
-    "pkg/packet/mrt",
-    "pkg/packet/rtr",
-    "pkg/server",
-  ]
-  pruneopts = "UT"
-  revision = "329c2d316efecfed0331e30114d7086aa58e247e"
-
-[[projects]]
-  digest = "1:95741de3af260a92cc5c7f3f3061e85273f5a81b5db20d4bd68da74bd521675e"
-  name = "github.com/pelletier/go-toml"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "c01d1270ff3e442a8a57cddc1c92dc1138598194"
-  version = "v1.2.0"
-
-[[projects]]
-  branch = "master"
-  digest = "1:dd6ba1917df517806c9dcee5c87f15643c9b1ca6260d5b3f25eb863c6fe092ce"
-  name = "github.com/satori/go.uuid"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "8ccf5352a842c034b1a69f28c863aff9b1cdb116"
-
-[[projects]]
-  digest = "1:3f53e9e4dfbb664cd62940c9c4b65a2171c66acd0b7621a1a6b8e78513525a52"
-  name = "github.com/sirupsen/logrus"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "ad15b42461921f1fb3529b058c6786c6a45d5162"
-  version = "v1.1.1"
-
-[[projects]]
-  digest = "1:6a4a11ba764a56d2758899ec6f3848d24698d48442ebce85ee7a3f63284526cd"
-  name = "github.com/spf13/afero"
-  packages = [
-    ".",
-    "mem",
-  ]
-  pruneopts = "UT"
-  revision = "d40851caa0d747393da1ffb28f7f9d8b4eeffebd"
-  version = "v1.1.2"
-
-[[projects]]
-  digest = "1:516e71bed754268937f57d4ecb190e01958452336fa73dbac880894164e91c1f"
-  name = "github.com/spf13/cast"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "8965335b8c7107321228e3e3702cab9832751bac"
-  version = "v1.2.0"
-
-[[projects]]
-  digest = "1:68ea4e23713989dc20b1bded5d9da2c5f9be14ff9885beef481848edd18c26cb"
-  name = "github.com/spf13/jwalterweatherman"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "4a4406e478ca629068e7768fc33f3f044173c0a6"
-  version = "v1.0.0"
-
-[[projects]]
-  digest = "1:c1b1102241e7f645bc8e0c22ae352e8f0dc6484b6cb4d132fa9f24174e0119e2"
-  name = "github.com/spf13/pflag"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "298182f68c66c05229eb03ac171abe6e309ee79a"
-  version = "v1.0.3"
-
-[[projects]]
-  branch = "master"
-  digest = "1:748519c76ecc7b5d673d7ee8924ace736ec1717b93011c77171b8bd961ac280c"
-  name = "github.com/spf13/viper"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "62edee319679b6ceaec16de03b966102d2dea709"
-
-[[projects]]
-  branch = "master"
-  digest = "1:b046e193dd6bb64f4df01dcc12eec2ec89ba32565f025f9cb9f1d54bc3945be9"
-  name = "github.com/vishvananda/netlink"
-  packages = [
-    ".",
-    "nl",
-  ]
-  pruneopts = "UT"
-  revision = "d3a23fd178f1a0d9cf1f194af62864b1dfe02be5"
-
-[[projects]]
-  branch = "master"
-  digest = "1:e4e30678fb2560b5c62f6308c5023d6c294fc7713216fa379411cc74465e866f"
-  name = "github.com/vishvananda/netns"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "13995c7128ccc8e51e9a6bd2b551020a27180abd"
-
-[[projects]]
-  branch = "master"
-  digest = "1:3f3a05ae0b95893d90b9b3b5afdb79a9b3d96e4e36e099d841ae602e4aca0da8"
-  name = "golang.org/x/crypto"
-  packages = ["ssh/terminal"]
-  pruneopts = "UT"
-  revision = "0c41d7ab0a0ee717d4590a44bcb987dfd9e183eb"
-
-[[projects]]
-  branch = "master"
-  digest = "1:505dbee0833715a72a529bb57c354826ad42a4496fad787fa143699b4de1a6d0"
-  name = "golang.org/x/net"
-  packages = [
-    "context",
-    "http/httpguts",
-    "http2",
-    "http2/hpack",
-    "idna",
-    "internal/timeseries",
-    "trace",
-  ]
-  pruneopts = "UT"
-  revision = "04a2e542c03f1d053ab3e4d6e5abcd4b66e2be8e"
-
-[[projects]]
-  branch = "master"
-  digest = "1:cfc31002d1ab36060fcd4a29d9f6bad6f9eeeab1dc6f5be78d37a0f825ba6dc1"
-  name = "golang.org/x/sys"
-  packages = [
-    "unix",
-    "windows",
-  ]
-  pruneopts = "UT"
-  revision = "eda9bb28ed513021f3e6a2a361031adc3d8a6301"
-
-[[projects]]
-  digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
-  name = "golang.org/x/text"
-  packages = [
-    "collate",
-    "collate/build",
-    "internal/colltab",
-    "internal/gen",
-    "internal/tag",
-    "internal/triegen",
-    "internal/ucd",
-    "language",
-    "secure/bidirule",
-    "transform",
-    "unicode/bidi",
-    "unicode/cldr",
-    "unicode/norm",
-    "unicode/rangetable",
-  ]
-  pruneopts = "UT"
-  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
-  version = "v0.3.0"
-
-[[projects]]
-  branch = "master"
-  digest = "1:56b0bca90b7e5d1facf5fbdacba23e4e0ce069d25381b8e2f70ef1e7ebfb9c1a"
-  name = "google.golang.org/genproto"
-  packages = ["googleapis/rpc/status"]
-  pruneopts = "UT"
-  revision = "94acd270e44e65579b9ee3cdab25034d33fed608"
-
-[[projects]]
-  digest = "1:ab8e92d746fb5c4c18846b0879842ac8e53b3d352449423d0924a11f1020ae1b"
-  name = "google.golang.org/grpc"
-  packages = [
-    ".",
-    "balancer",
-    "balancer/base",
-    "balancer/roundrobin",
-    "codes",
-    "connectivity",
-    "credentials",
-    "encoding",
-    "encoding/proto",
-    "grpclog",
-    "internal",
-    "internal/backoff",
-    "internal/channelz",
-    "internal/envconfig",
-    "internal/grpcrand",
-    "internal/transport",
-    "keepalive",
-    "metadata",
-    "naming",
-    "peer",
-    "resolver",
-    "resolver/dns",
-    "resolver/passthrough",
-    "stats",
-    "status",
-    "tap",
-  ]
-  pruneopts = "UT"
-  revision = "8dea3dc473e90c8179e519d91302d0597c0ca1d1"
-  version = "v1.15.0"
-
-[[projects]]
-  branch = "v2"
-  digest = "1:5bb148b78468350091db2ffbb2370f35cc6dcd74d9378a31b1c7b86ff7528f08"
-  name = "gopkg.in/tomb.v2"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "d5d1b5820637886def9eef33e03a27a9f166942c"
-
-[[projects]]
-  digest = "1:342378ac4dcb378a5448dd723f0784ae519383532f5e70ade24132c4c8693202"
-  name = "gopkg.in/yaml.v2"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "5420a8b6744d3b0345ab293f6fcba19c978f1183"
-  version = "v2.2.1"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  input-imports = [
-    "github.com/golang/glog",
-    "github.com/golang/protobuf/ptypes",
-    "github.com/golang/protobuf/ptypes/any",
-    "github.com/osrg/gobgp/api",
-    "github.com/osrg/gobgp/pkg/server",
-    "gopkg.in/yaml.v2",
-  ]
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

@@ -1,42 +0,0 @@
-# Gopkg.toml example
-#
-# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#   name = "github.com/x/y"
-#   version = "2.4.0"
-#
-# [prune]
-#   non-go = false
-#   go-tests = true
-#   unused-packages = true
-
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/golang/glog"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/golang/protobuf"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/osrg/gobgp"
-
-[prune]
-  go-tests = true
-  unused-packages = true

Makefile

@@ -1,19 +1,23 @@
 .PHONY: all gocast test
 
+DOCKER_IMAGE := mayuresh82/gocast
+VERSION := $(shell git describe --exact-match --tags 2>/dev/null)
+BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
+COMMIT := $(shell git rev-parse --short HEAD)
+DOCKER_TAG := $(COMMIT)
+LDFLAGS := $(LDFLAGS) -X main.commit=$(COMMIT) -X main.branch=$(BRANCH)
+ifdef VERSION
+    LDFLAGS += -X main.version=$(VERSION)
+	DOCKER_TAG = $(VERSION)
+endif
+
 all:
-	$(MAKE) deps
 	$(MAKE) gocast
 
-deps:
-	go get -u golang.org/x/lint/golint
-	go get -u github.com/golang/dep/cmd/dep
-	dep ensure
-
 gocast:
-	go build .
+	go build -ldflags "$(LDFLAGS)" .
 
 debug:
-	dep ensure
 	go build -race .
 
 test:

config.yaml

@@ -11,7 +11,7 @@ agent:
   consul_query_interval: 5m
 
 bgp:
-  local_as: 12345
+  - local_as: 12345
     remote_as: 6789
     # override the peer IP to use instead of auto discovering
     peer_ip: 10.10.10.1
@@ -19,4 +19,4 @@ bgp:
       - asn:nnnn
       - asn:nnnn
     origin: igp
-
+    addr_family: "4"

config/config.go

@@ -1,11 +1,12 @@
 package config
 
 import (
-	"github.com/golang/glog"
-	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"path/filepath"
 	"time"
+
+	"github.com/golang/glog"
+	"gopkg.in/yaml.v2"
 )
 
 type Config struct {
@@ -16,12 +17,13 @@ type Config struct {
 		ConsulAddr          string        `yaml:"consul_addr"`
 		ConsulQueryInterval time.Duration `yaml:"consul_query_interval"`
 	}
-	Bgp struct {
+	Bgp []struct {
 		LocalAS     int    `yaml:"local_as"`
 		PeerAS      int    `yaml:"peer_as"`
 		PeerIP      string `yaml:"peer_ip"`
 		Communities []string
 		Origin      string
+		AddrFamily  string `yaml:"addr_family"`
 	}
 	Apps []struct {
 		Name     string

controller/app.go

@@ -2,9 +2,10 @@ package controller
 
 import (
 	"fmt"
-	"github.com/golang/glog"
 	"net"
 	"strings"
+
+	"github.com/golang/glog"
 )
 
 type MonitorType int
@@ -13,6 +14,7 @@ const (
 	Monitor_PORT         MonitorType = 1
 	Monitor_EXEC         MonitorType = 2
 	Monitor_CONSUL       MonitorType = 3
+	defaultFailThreshold             = 3
 )
 
 var MonitorMap = map[string]MonitorType{"port": Monitor_PORT, "exec": Monitor_EXEC, "consul": Monitor_CONSUL}
@@ -31,6 +33,7 @@ type Monitor struct {
 	Port      string
 	Protocol  string
 	Cmd       string
+	FailCount int
 }
 
 func (m *Monitor) Equal(other *Monitor) bool {
@@ -48,9 +51,19 @@ func (m Monitors) Contains(elem *Monitor) bool {
 	return false
 }
 
+type Vip struct {
+	IP     net.IP
+	Net    *net.IPNet
+	Family string
+}
+
+func (v *Vip) Equal(other *Vip) bool {
+	return v.IP.Equal(other.IP)
+}
+
 type App struct {
 	Name     string
-	Vip      *net.IPNet
+	Vip      *Vip
 	Monitors Monitors
 	Nats     []string
 }
@@ -64,7 +77,7 @@ func (a *App) Equal(other *App) bool {
 			return false
 		}
 	}
-	return a.Name == other.Name && a.Vip.String() == other.Vip.String()
+	return a.Name == other.Name && a.Vip.Equal(other.Vip)
 }
 
 func NewApp(appName, vip string, monitors []string, nats []string) (*App, error) {
@@ -72,11 +85,16 @@ func NewApp(appName, vip string, monitors []string, nats []string) (*App, error)
 		return nil, fmt.Errorf("Invalid app name")
 	}
 	app := &App{Name: appName, Nats: nats}
-	_, ipnet, err := net.ParseCIDR(vip)
+	ip, ipnet, err := net.ParseCIDR(vip)
 	if err != nil {
 		return nil, fmt.Errorf("Invalid VIP specified, need ip/mask")
 	}
-	app.Vip = ipnet
+	app.Vip = &Vip{IP: ip, Net: ipnet}
+	if ip.To4() != nil {
+		app.Vip.Family = "4"
+	} else {
+		app.Vip.Family = "6"
+	}
 	for _, m := range monitors {
 		// valid monitor formats:
 		// "port:tcp:123" , "exec:/local/check.sh", "consul"

controller/bgp.go

@@ -3,161 +3,215 @@ package controller
 import (
 	"context"
 	"fmt"
+	"net"
+	"strconv"
+	"strings"
+
 	"github.com/golang/protobuf/ptypes"
 	"github.com/golang/protobuf/ptypes/any"
 	c "github.com/mayuresh82/gocast/config"
 	api "github.com/osrg/gobgp/api"
 	gobgp "github.com/osrg/gobgp/pkg/server"
-	"net"
-	"strconv"
-	"strings"
 )
 
-type Controller struct {
+type Peer struct {
 	peerAS          int
 	localIP, peerIP net.IP
 	communities     []string
 	origin          uint32
 	multiHop        bool
+	family          string
+	announced       []string
+}
+
+type Controller struct {
+	peers []*Peer
 	s     *gobgp.BgpServer
 }
 
 func NewController(config *c.Config) (*Controller, error) {
-	c := &Controller{}
+	c := &Controller{s: gobgp.NewBgpServer()}
-	var gw net.IP
+	go c.s.Serve()
+	for _, bgpConf := range config.Bgp {
+		p := &Peer{}
 		var err error
-	if config.Bgp.PeerIP == "" {
+		if bgpConf.PeerIP == "" {
-		gw, err = gateway()
+			p.peerIP, err = gateway(bgpConf.AddrFamily)
-		c.peerIP = gw
 		} else {
-		c.peerIP = net.ParseIP(config.Bgp.PeerIP)
+			p.peerIP = net.ParseIP(bgpConf.PeerIP)
-		gw, err = via(c.peerIP)
 		}
-	if err != nil || c.peerIP == nil {
+		if err != nil || p.peerIP == nil {
 			return nil, fmt.Errorf("Unable to get peer IP : %v", err)
 		}
-	c.communities = config.Bgp.Communities
+		p.communities = bgpConf.Communities
-	switch config.Bgp.Origin {
+		switch bgpConf.Origin {
 		case "igp":
-		c.origin = 0
+			p.origin = 0
 		case "egp":
-		c.origin = 1
+			p.origin = 1
 		case "unknown":
-		c.origin = 2
+			p.origin = 2
 		}
-	s := gobgp.NewBgpServer()
+		dev, err := via(p.peerIP)
-	go s.Serve()
-	localAddr, err := localAddress(gw)
 		if err != nil {
 			return nil, err
 		}
-	c.localIP = localAddr
+		localAddr, err := localAddress(dev, bgpConf.AddrFamily)
-	if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
+		if err != nil {
+			return nil, err
+		}
+		p.localIP = localAddr
+		p.peerAS = bgpConf.PeerAS
+		// set mh by default for all ebgp peers
+		if p.peerAS != bgpConf.LocalAS {
+			p.multiHop = true
+		}
+		localAddr4, _ := localAddress(dev, "4") // for router-id
+		if err := c.s.StartBgp(context.Background(), &api.StartBgpRequest{
 			Global: &api.Global{
-			As:         uint32(config.Bgp.LocalAS),
+				As:         uint32(bgpConf.LocalAS),
-			RouterId:   localAddr.String(),
+				RouterId:   localAddr4.String(),
 				ListenPort: -1, // gobgp won't listen on tcp:179
 			},
 		}); err != nil {
 			return nil, fmt.Errorf("Unable to start bgp: %v", err)
 		}
-	c.s = s
+		p.family = "6"
-	c.peerAS = config.Bgp.PeerAS
+		if p.peerIP.To4() != nil {
-	// set mh by default for all ebgp peers
+			p.family = "4"
-	if c.peerAS != config.Bgp.LocalAS {
+		}
-		c.multiHop = true
+		c.peers = append(c.peers, p)
 	}
 	return c, nil
 }
 
-func (c *Controller) AddPeer(peer string) error {
+func (c *Controller) localIP(family string) net.IP {
+	for _, peer := range c.peers {
+		if peer.family == family {
+			return peer.localIP
+		}
+	}
+	return nil
+}
+
+func (c *Controller) AddPeer(p *Peer) error {
 	n := &api.Peer{
 		Conf: &api.PeerConf{
-			NeighborAddress: peer,
+			NeighborAddress: p.peerIP.String(),
-			PeerAs:          uint32(c.peerAS),
+			PeerAs:          uint32(p.peerAS),
 		},
 	}
-	if c.multiHop {
+	if p.multiHop {
 		n.EbgpMultihop = &api.EbgpMultihop{Enabled: true, MultihopTtl: uint32(255)}
 	}
 	return c.s.AddPeer(context.Background(), &api.AddPeerRequest{Peer: n})
 }
 
-func (c *Controller) getApiPath(route *net.IPNet) *api.Path {
+func (c *Controller) getApiPath(p *Peer, route *net.IPNet, withdraw bool) *api.Path {
 	afi := api.Family_AFI_IP
 	if route.IP.To4() == nil {
 		afi = api.Family_AFI_IP6
 	}
+	family := &api.Family{Afi: afi, Safi: api.Family_SAFI_UNICAST}
 	prefixlen, _ := route.Mask.Size()
 	nlri, _ := ptypes.MarshalAny(&api.IPAddressPrefix{
 		Prefix:    route.IP.String(),
 		PrefixLen: uint32(prefixlen),
 	})
 	a1, _ := ptypes.MarshalAny(&api.OriginAttribute{
-		Origin: c.origin,
+		Origin: p.origin,
-	})
-	a2, _ := ptypes.MarshalAny(&api.NextHopAttribute{
-		NextHop: c.localIP.String(),
 	})
 	var communities []uint32
-	for _, comm := range c.communities {
+	for _, comm := range p.communities {
 		communities = append(communities, convertCommunity(comm))
 	}
-	a3, _ := ptypes.MarshalAny(&api.CommunitiesAttribute{
+	a2, _ := ptypes.MarshalAny(&api.CommunitiesAttribute{
 		Communities: communities,
 	})
-	attrs := []*any.Any{a1, a2, a3}
+	attrs := []*any.Any{a1, a2}
-	return &api.Path{
+	path := &api.Path{AnyNlri: nlri, Family: family, AnyPattrs: attrs, IsWithdraw: withdraw}
-		Family:    &api.Family{Afi: afi, Safi: api.Family_SAFI_UNICAST},
+	switch afi {
-		AnyNlri:   nlri,
+	case api.Family_AFI_IP:
-		AnyPattrs: attrs,
+		nh, _ := ptypes.MarshalAny(&api.NextHopAttribute{
+			NextHop: p.localIP.String(),
+		})
+		path.AnyPattrs = append(path.AnyPattrs, nh)
+	case api.Family_AFI_IP6:
+		mpReachAttr, _ := ptypes.MarshalAny(&api.MpReachNLRIAttribute{
+			Family:   family,
+			NextHops: []string{p.localIP.String()},
+			Nlris:    []*any.Any{nlri},
+		})
+		mpUnreachAttr, _ := ptypes.MarshalAny(&api.MpUnreachNLRIAttribute{
+			Family: family,
+			Nlris:  []*any.Any{nlri},
+		})
+		if withdraw {
+			path.AnyPattrs = append(path.AnyPattrs, mpUnreachAttr)
+		} else {
+			path.AnyPattrs = append(path.AnyPattrs, mpReachAttr)
 		}
 	}
+	return path
+}
 
 func (c *Controller) Announce(route *net.IPNet) error {
+	family := "6"
+	if route.IP.To4() != nil {
+		family = "4"
+	}
+	for _, peer := range c.peers {
+		if peer.family != family {
+			continue
+		}
 		peers, err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{})
 		if err != nil {
 			return err
 		}
 		var found bool
 		for _, p := range peers {
-		if p.Conf.NeighborAddress == c.peerIP.String() {
+			if p.Conf.NeighborAddress == peer.peerIP.String() {
 				found = true
 				break
 			}
 		}
 		if !found {
-		if err := c.AddPeer(c.peerIP.String()); err != nil {
+			if err := c.AddPeer(peer); err != nil {
 				return err
 			}
 		}
-	_, err = c.s.AddPath(context.Background(), &api.AddPathRequest{Path: c.getApiPath(route)})
+		if _, err := c.s.AddPath(context.Background(), &api.AddPathRequest{Path: c.getApiPath(peer, route, false)}); err != nil {
 			return err
 		}
+		peer.announced = append(peer.announced, route.String())
+	}
+	return nil
+}
 
 func (c *Controller) Withdraw(route *net.IPNet) error {
-	return c.s.DeletePath(context.Background(), &api.DeletePathRequest{Path: c.getApiPath(route)})
+	for _, peer := range c.peers {
+		if !contains(peer.announced, route.String()) {
+			continue
+		}
+		if err := c.s.DeletePath(context.Background(), &api.DeletePathRequest{Path: c.getApiPath(peer, route, true)}); err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
-func (c *Controller) PeerInfo() (*api.Peer, error) {
+func (c *Controller) PeerInfo() ([]*api.Peer, error) {
-	peers, err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{})
+	return c.s.ListPeer(context.Background(), &api.ListPeerRequest{})
-	if err != nil {
-		return nil, err
-	}
-	for _, p := range peers {
-		if p.Conf.NeighborAddress == c.peerIP.String() {
-			return p, nil
-		}
-	}
-	return nil, nil
 }
 
 func (c *Controller) Shutdown() error {
+	for _, peer := range c.peers {
 		if err := c.s.ShutdownPeer(context.Background(), &api.ShutdownPeerRequest{
-		Address: c.peerIP.String(),
+			Address: peer.peerIP.String(),
 		}); err != nil {
 			return err
 		}
+	}
 	if err := c.s.StopBgp(context.Background(), &api.StopBgpRequest{}); err != nil {
 		return err
 	}

controller/monitor.go

@@ -2,18 +2,19 @@ package controller
 
 import (
 	"fmt"
-	"github.com/golang/glog"
-	c "github.com/mayuresh82/gocast/config"
-	api "github.com/osrg/gobgp/api"
 	"net"
 	"os/exec"
 	"strings"
 	"sync"
 	"time"
+
+	"github.com/golang/glog"
+	c "github.com/mayuresh82/gocast/config"
+	api "github.com/osrg/gobgp/api"
 )
 
 const (
-	defaultMonitorInterval = 10 * time.Second
+	defaultMonitorInterval = 20 * time.Second
 	defaultCleanupTimer    = 15 * time.Minute
 )
 
@@ -56,9 +57,11 @@ type appMon struct {
 	app        *App
 	done       chan bool
 	announced  bool
+	vipCreated bool
 	checkOn    bool
 }
 
+// MonitorMgr manages all registered apps and their healthcheck monitors
 type MonitorMgr struct {
 	monitors map[string]*appMon
 	cleanups map[string]chan bool
@@ -69,6 +72,7 @@ type MonitorMgr struct {
 	sync.Mutex
 }
 
+// NewMonitor returns a new instance of MonitorMgr
 func NewMonitor(config *c.Config) *MonitorMgr {
 	ctrl, err := NewController(config)
 	if err != nil {
@@ -141,6 +145,7 @@ func (m *MonitorMgr) consulMon() {
 	}
 }
 
+// Add adds a new app to be monitored
 func (m *MonitorMgr) Add(app *App) {
 	// check if already running
 	m.Lock()
@@ -150,8 +155,8 @@ func (m *MonitorMgr) Add(app *App) {
 			glog.V(2).Infof("App %s already exists", app.Name)
 			return
 		}
-		if appMon.app.Vip.String() == app.Vip.String() && appMon.app.Name != app.Name {
+		if appMon.app.Vip.Equal(app.Vip) && appMon.app.Name != app.Name {
-			glog.Errorf("Error: Vip %s is already being announced by app: %s", app.Vip.String(), appMon.app.Name)
+			glog.Errorf("Error: Vip %s is already being announced by app: %s", app.Vip.IP.String(), appMon.app.Name)
 			return
 		}
 	}
@@ -162,16 +167,20 @@ func (m *MonitorMgr) Add(app *App) {
 	glog.Infof("Registered a new app: %v", app)
 }
 
+// Remove removes an existing app and withdraws the bgp vip
 func (m *MonitorMgr) Remove(appName string) {
 	if a, ok := m.monitors[appName]; ok {
 		if a.checkOn {
 			a.done <- true
 		}
 		if a.announced {
-			if err := m.ctrl.Withdraw(a.app.Vip); err != nil {
+			if err := m.ctrl.Withdraw(a.app.Vip.Net); err != nil {
 				glog.Errorf("Failed to withdraw route: %v", err)
 			}
 		}
+		if !a.vipCreated {
+			return
+		}
 		if err := deleteLoopback(a.app.Vip); err != nil {
 			glog.Errorf("Failed to remove app: %s: %v", a.app.Name, err)
 		}
@@ -180,7 +189,12 @@ func (m *MonitorMgr) Remove(appName string) {
 			if len(parts) != 2 {
 				continue
 			}
-			if err := natRule("D", a.app.Vip.IP, m.ctrl.localIP, parts[0], parts[1]); err != nil {
+			localIP := m.ctrl.localIP(a.app.Vip.Family)
+			if localIP == nil {
+				glog.Errorf("Failed to get local IP for family %s", a.app.Vip.Family)
+				continue
+			}
+			if err := natRule("D", a.app.Vip.IP, localIP, parts[0], parts[1]); err != nil {
 				glog.Errorf("Failed to remove app: %s: %v", a.app.Name, err)
 			}
 		}
@@ -204,9 +218,16 @@ func (m *MonitorMgr) runMonitors(app *App) bool {
 		}
 		if !check {
 			glog.V(2).Infof("%s Monitor for app: %s Failed", mon.Type.String(), app.Name)
+			if mon.FailCount >= defaultFailThreshold {
 				return false
 			}
+			mon.FailCount++
 		}
+		if check {
+			mon.FailCount = 0
+		}
+	}
+	glog.V(2).Infof("All Monitors for app: %s succeeded", app.Name)
 	return true
 }
 
@@ -215,8 +236,7 @@ func (m *MonitorMgr) checkCond(am *appMon) error {
 	m.Lock()
 	defer m.Unlock()
 	if m.runMonitors(app) {
-		glog.V(2).Infof("All Monitors for app: %s succeeded", app.Name)
+		if !am.vipCreated {
-		if !am.announced {
 			if err := addLoopback(app.Name, app.Vip); err != nil {
 				return err
 			}
@@ -225,11 +245,19 @@ func (m *MonitorMgr) checkCond(am *appMon) error {
 				if len(parts) != 2 {
 					continue
 				}
-				if err := natRule("A", app.Vip.IP, m.ctrl.localIP, parts[0], parts[1]); err != nil {
+				localIP := m.ctrl.localIP(app.Vip.Family)
+				if localIP == nil {
+					glog.Errorf("Failed to get local IP for family %s", app.Vip.Family)
+					continue
+				}
+				if err := natRule("A", app.Vip.IP, localIP, parts[0], parts[1]); err != nil {
 					return err
 				}
 			}
-			if err := m.ctrl.Announce(app.Vip); err != nil {
+			am.vipCreated = true
+		}
+		if !am.announced {
+			if err := m.ctrl.Announce(app.Vip.Net); err != nil {
 				return fmt.Errorf("Failed to announce route: %v", err)
 			}
 			am.announced = true
@@ -239,7 +267,7 @@ func (m *MonitorMgr) checkCond(am *appMon) error {
 		}
 	} else {
 		if am.announced {
-			if err := m.ctrl.Withdraw(app.Vip); err != nil {
+			if err := m.ctrl.Withdraw(app.Vip.Net); err != nil {
 				return fmt.Errorf("Failed to withdraw route: %v", err)
 			}
 			am.announced = false
@@ -271,6 +299,7 @@ func (m *MonitorMgr) runLoop(am *appMon) {
 	}
 }
 
+// CloseAll closes all open bgp sessions and cleans up all apps and their VIPs
 func (m *MonitorMgr) CloseAll() {
 	glog.Infof("Shutting down all open bgp sessions")
 	if err := m.ctrl.Shutdown(); err != nil {
@@ -286,11 +315,17 @@ func (m *MonitorMgr) CloseAll() {
 			if len(parts) != 2 {
 				continue
 			}
-			natRule("D", am.app.Vip.IP, m.ctrl.localIP, parts[0], parts[1])
+			localIP := m.ctrl.localIP(am.app.Vip.Family)
+			if localIP == nil {
+				glog.Errorf("Failed to get local IP for family %s", am.app.Vip.Family)
+				continue
+			}
+			natRule("D", am.app.Vip.IP, localIP, parts[0], parts[1])
 		}
 	}
 }
 
+// Cleanup waits for cleanuptimer to expire and then removes the app
 func (m *MonitorMgr) Cleanup(app string, exit chan bool) {
 	t := time.NewTimer(m.config.Agent.CleanupTimer)
 	defer t.Stop()
@@ -307,6 +342,7 @@ func (m *MonitorMgr) Cleanup(app string, exit chan bool) {
 	}
 }
 
-func (m *MonitorMgr) GetInfo() (*api.Peer, error) {
+// GetInfo returns BGP peer info for a specific peer
+func (m *MonitorMgr) GetInfo() ([]*api.Peer, error) {
 	return m.ctrl.PeerInfo()
 }

controller/system.go

@@ -7,8 +7,12 @@ import (
 	"strings"
 )
 
-func gateway() (net.IP, error) {
+func gateway(family string) (net.IP, error) {
-	cmd := `ip route | grep "^default" | cut -d" " -f3`
+	ipCmd := "ip"
+	if family == "6" {
+		ipCmd = "ip -6"
+	}
+	cmd := fmt.Sprintf(`%s route | grep "^default" | cut -d" " -f3`, ipCmd)
 	out, err := exec.Command("bash", "-c", cmd).Output()
 	if err != nil {
 		return nil, fmt.Errorf("Failed to execute command: %s", cmd)
@@ -16,40 +20,59 @@ func gateway() (net.IP, error) {
 	return net.ParseIP(strings.TrimSpace(string(out))), nil
 }
 
-func via(dest net.IP) (net.IP, error) {
+func via(dest net.IP) (string, error) {
-	cmd := fmt.Sprintf(`ip route get %s | grep via | cut -d" " -f3`, dest.String())
+	ipCmd := "ip"
+	if dest.To4() == nil {
+		ipCmd = "ip -6"
+	}
+	cmd := fmt.Sprintf(`%s route get %s | grep src | cut -d" " -f3`, ipCmd, dest.String())
 	out, err := exec.Command("bash", "-c", cmd).Output()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to execute command: %s", cmd)
+		return "", fmt.Errorf("Failed to execute command: %s", cmd)
 	}
-	return net.ParseIP(strings.TrimSpace(string(out))), nil
+	return strings.TrimSpace(string(out)), nil
 }
 
-func localAddress(gw net.IP) (net.IP, error) {
+func localAddress(dev string, family string) (net.IP, error) {
-	addrs, err := net.InterfaceAddrs()
+	iface, err := net.InterfaceByName(dev)
+	if err != nil {
+		return nil, err
+	}
+	addrs, err := iface.Addrs()
 	if err != nil {
 		return nil, err
 	}
 	for _, addr := range addrs {
+		var ip net.IP
 		switch v := addr.(type) {
 		case *net.IPNet:
-			if v.Contains(gw) {
+			ip = v.IP
-				return v.IP, nil
+		case *net.IPAddr:
+			ip = v.IP
 		}
+		if family == "4" && ip.To4() != nil {
+			return ip, nil
+		}
+		if family == "6" && ip.To4() == nil && !ip.IsLinkLocalUnicast() {
+			return ip, nil
 		}
 	}
 	return nil, fmt.Errorf("Unable to find local address")
 }
 
-func addLoopback(name string, addr *net.IPNet) error {
+func addLoopback(name string, vip *Vip) error {
-	deleteLoopback(addr)
+	deleteLoopback(vip)
-	prefixLen, _ := addr.Mask.Size()
+	prefixLen, _ := vip.Net.Mask.Size()
 	label := fmt.Sprintf("lo:%s", name)
 	// linux kernel limits labels to 15 chars
 	if len(label) > 15 {
 		label = label[:15]
 	}
-	cmd := fmt.Sprintf("ip address add %s/%d dev lo label %s", addr.IP.String(), prefixLen, label)
+	ipCmd := "ip"
+	if vip.Family == "6" {
+		ipCmd = "ip -6"
+	}
+	cmd := fmt.Sprintf("%s address add %s/%d dev lo label %s", ipCmd, vip.IP.String(), prefixLen, label)
 	_, err := exec.Command("bash", "-c", cmd).Output()
 	if err != nil {
 		return fmt.Errorf("Failed to Add loopback command: %s: %v", cmd, err)
@@ -57,9 +80,13 @@ func addLoopback(name string, addr *net.IPNet) error {
 	return nil
 }
 
-func deleteLoopback(addr *net.IPNet) error {
+func deleteLoopback(vip *Vip) error {
-	prefixLen, _ := addr.Mask.Size()
+	prefixLen, _ := vip.Net.Mask.Size()
-	cmd := fmt.Sprintf("ip address delete %s/%d dev lo", addr.IP.String(), prefixLen)
+	ipCmd := "ip"
+	if vip.Family == "6" {
+		ipCmd = "ip -6"
+	}
+	cmd := fmt.Sprintf("%s address delete %s/%d dev lo", ipCmd, vip.IP.String(), prefixLen)
 	_, err := exec.Command("bash", "-c", cmd).Output()
 	if err != nil {
 		return fmt.Errorf("Failed to delete loopback command: %s: %v", cmd, err)
@@ -68,9 +95,15 @@ func deleteLoopback(addr *net.IPNet) error {
 }
 
 func natRule(op string, vip, localAddr net.IP, protocol, port string) error {
+	iptCmd := "iptables"
+	toDest := fmt.Sprintf("%s:%s", localAddr.String(), port)
+	if vip.To4() == nil {
+		iptCmd = "ip6tables"
+		toDest = fmt.Sprintf("[%s]:%s", localAddr.String(), port)
+	}
 	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",
-		op, protocol, vip.String(), port, localAddr.String(), port,
+		iptCmd, op, protocol, vip.String(), port, toDest,
 	)
 	_, err := exec.Command("bash", "-c", cmd).Output()
 	if err != nil {

go.mod

@@ -0,0 +1,29 @@
+module github.com/mayuresh82/gocast
+
+go 1.12
+
+require (
+	github.com/armon/go-radix v1.0.0 // indirect
+	github.com/dgryski/go-farm v0.0.0-20180109070241-2de33835d102 // indirect
+	github.com/eapache/channels v1.1.0 // indirect
+	github.com/eapache/queue v1.1.0 // indirect
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/golang/protobuf v1.2.0
+	github.com/influxdata/influxdb v1.6.4 // indirect
+	github.com/konsorten/go-windows-terminal-sequences v1.0.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/osrg/gobgp v0.0.0-20180929145215-329c2d316efe
+	github.com/satori/go.uuid v0.0.0-20181016184021-8ccf5352a842 // indirect
+	github.com/sirupsen/logrus v1.1.1
+	github.com/spf13/pflag v1.0.3 // indirect
+	github.com/spf13/viper v0.0.0-20180930044127-62edee319679 // indirect
+	github.com/vishvananda/netlink v0.0.0-20181018205019-d3a23fd178f1 // indirect
+	github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc // indirect
+	golang.org/x/crypto v0.0.0-20181015023909-0c41d7ab0a0e // indirect
+	golang.org/x/net v0.0.0-20181017193950-04a2e542c03f // indirect
+	golang.org/x/sys v0.0.0-20181021155630-eda9bb28ed51 // indirect
+	google.golang.org/genproto v0.0.0-20181016170114-94acd270e44e // indirect
+	google.golang.org/grpc v1.15.0 // indirect
+	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637 // indirect
+	gopkg.in/yaml.v2 v2.2.1
+)

go.sum

@@ -0,0 +1,93 @@
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main.go

@@ -3,20 +3,33 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
 	"github.com/golang/glog"
 	c "github.com/mayuresh82/gocast/config"
 	"github.com/mayuresh82/gocast/controller"
 	"github.com/mayuresh82/gocast/server"
 	log "github.com/sirupsen/logrus"
-	"os"
-	"os/signal"
-	"syscall"
 )
 
 var (
 	config      = flag.String("config", "", "Path to config file")
+	nextVersion = "0.0.1"
+	version     string
+	commit      string
+	branch      string
 )
 
+func getVersion() string {
+	if version == "" {
+		return fmt.Sprintf("v%s~%s", nextVersion, commit)
+	}
+	return fmt.Sprintf("%s~%s", version, commit)
+}
+
 func main() {
 	flag.Parse()
 	if glog.V(4) {
@@ -26,8 +39,11 @@ func main() {
 	mon := controller.NewMonitor(conf)
 	srv := server.NewServer(conf.Agent.ListenAddr, mon)
 
+	glog.Infof("Starting GoCast %s", getVersion())
 	ctx, cancel := context.WithCancel(context.Background())
+	go srv.Serve(ctx)
 	// catch interrupt
+	shutdown := make(chan struct{})
 	signalChan := make(chan os.Signal, 1)
 	signal.Notify(signalChan, os.Interrupt, syscall.SIGHUP, syscall.SIGTERM)
 	go func() {
@@ -36,9 +52,10 @@ func main() {
 			if sig == os.Interrupt || sig == syscall.SIGTERM {
 				mon.CloseAll()
 				cancel()
+				shutdown <- struct{}{}
 				return
 			}
 		}
 	}()
-	srv.Serve(ctx)
+	<-shutdown
 }