add registry base interface, mdns, noop implementations, add resolver, client

README.md

@@ -1,6 +1,11 @@
 # gRPC 
 
-A utility module, implementing some of the [go-micro](https://github.com/micro/go-micro) patterns with pure gRPC ecosystem modules.
+A utility module, largely taken from the [go-micro](https://github.com/micro/go-micro) patterns (and a good amount of code too...) 
+with pure gRPC ecosystem modules.
+
+Principles:
+- Pluggable
+- No singleton
 
 Features:
 - [x] simple configuration with options
@@ -28,7 +33,7 @@ Features:
     - [ ] auth
     - [ ] cors
     - [ ] logging
-    - [ ] tracing
+    - [ ] tracing
     - [ ] metrics
 - [ ] broker, based on nats-streaming
 

client/client.go

@@ -0,0 +1,53 @@
+package client
+
+import (
+	"crypto/tls"
+	"fmt"
+	"strings"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/resolver"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry/noop"
+)
+
+type Client interface {
+	Dial(name string, version string, opts ...grpc.DialOption) (*grpc.ClientConn, error)
+}
+
+func New(opts ...Option) (Client, error) {
+	c := &client{opts: &options{}}
+	for _, o := range opts {
+		o(c.opts)
+	}
+	if c.opts.registry == nil {
+		c.opts.registry = noop.New()
+	}
+	resolver.Register(c.opts.registry.ResolverBuilder())
+	c.pool = newPool(DefaultPoolSize, DefaultPoolTTL, DefaultPoolMaxIdle, DefaultPoolMaxStreams)
+	return c, nil
+}
+
+type client struct {
+	pool *pool
+	opts *options
+}
+
+func (c client) Dial(name, version string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
+	if c.opts.tlsConfig == nil && c.opts.Secure() {
+		c.opts.tlsConfig = &tls.Config{InsecureSkipVerify: true}
+	}
+	if c.opts.tlsConfig != nil {
+		opts = append(opts, grpc.WithTransportCredentials(credentials.NewTLS(c.opts.tlsConfig)))
+	}
+	addr := fmt.Sprintf("%s:///%s", c.opts.registry.String(), name)
+	if version != "" {
+		addr = addr + ":" + strings.TrimSpace(version)
+	}
+	pc, err := c.pool.getConn(addr, opts...)
+	if err != nil {
+	  return nil, err
+	}
+	return pc.ClientConn, nil
+}

client/options.go

@@ -0,0 +1,63 @@
+package client
+
+import (
+	"crypto/tls"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+)
+
+type Options interface {
+	Version() string
+	Registry() registry.Registry
+	TLSConfig() *tls.Config
+}
+
+type Option func(*options)
+
+func WithRegistry(registry registry.Registry) Option {
+	return func(o *options) {
+		o.registry = registry
+	}
+}
+
+func WithVersion(version string) Option {
+	return func(o *options) {
+		o.version = version
+	}
+}
+
+func WithTLSConfig(conf *tls.Config) Option {
+	return func(o *options) {
+		o.tlsConfig = conf
+	}
+}
+
+func WithSecure(s bool) Option {
+	return func(o *options) {
+		o.secure = s
+	}
+}
+
+type options struct {
+	registry  registry.Registry
+	version   string
+	tlsConfig *tls.Config
+	secure    bool
+}
+
+func (o *options) Version() string {
+	return o.version
+}
+
+func (o *options) Registry() registry.Registry {
+	return o.registry
+}
+
+func (o *options) TLSConfig() *tls.Config {
+	return o.tlsConfig
+}
+
+func (o *options) Secure() bool {
+	return o.secure
+}
+

client/pool.go

@@ -0,0 +1,244 @@
+/*
+Taken from the https://github.com/micro/go-micro/client/grpc
+ */
+
+package client
+
+import (
+	"sync"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/connectivity"
+)
+
+var (
+	// DefaultPoolSize sets the connection pool size
+	DefaultPoolSize = 100
+	// DefaultPoolTTL sets the connection pool ttl
+	DefaultPoolTTL = time.Minute
+	// DefaultPoolMaxStreams maximum streams on a connectioin
+	// (20)
+	DefaultPoolMaxStreams = 20
+
+	// DefaultPoolMaxIdle maximum idle conns of a pool
+	// (50)
+	DefaultPoolMaxIdle = 50
+
+	// DefaultMaxRecvMsgSize maximum message that client can receive
+	// (4 MB).
+	DefaultMaxRecvMsgSize = 1024 * 1024 * 4
+
+	// DefaultMaxSendMsgSize maximum message that client can send
+	// (4 MB).
+	DefaultMaxSendMsgSize = 1024 * 1024 * 4
+)
+
+type pool struct {
+	size int
+	ttl  int64
+
+	//  max streams on a *poolConn
+	maxStreams int
+	//  max idle conns
+	maxIdle int
+
+	sync.Mutex
+	conns map[string]*streamsPool
+}
+
+type streamsPool struct {
+	//  head of list
+	head *poolConn
+	//  busy conns list
+	busy *poolConn
+	//  the siza of list
+	count int
+	//  idle conn
+	idle int
+}
+
+type poolConn struct {
+	//  grpc conn
+	*grpc.ClientConn
+	err  error
+	addr string
+
+	//  pool and streams pool
+	pool    *pool
+	sp      *streamsPool
+	streams int
+	created int64
+
+	//  list
+	pre  *poolConn
+	next *poolConn
+	in   bool
+}
+
+func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
+	if ms <= 0 {
+		ms = 1
+	}
+	if idle < 0 {
+		idle = 0
+	}
+	return &pool{
+		size:       size,
+		ttl:        int64(ttl.Seconds()),
+		maxStreams: ms,
+		maxIdle:    idle,
+		conns:      make(map[string]*streamsPool),
+	}
+}
+
+func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error) {
+	now := time.Now().Unix()
+	p.Lock()
+	sp, ok := p.conns[addr]
+	if !ok {
+		sp = &streamsPool{head: &poolConn{}, busy: &poolConn{}, count: 0, idle: 0}
+		p.conns[addr] = sp
+	}
+	//  while we have conns check streams and then return one
+	//  otherwise we'll create a new conn
+	conn := sp.head.next
+	for conn != nil {
+		//  check conn state
+		// https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md
+		switch conn.GetState() {
+		case connectivity.Connecting:
+			conn = conn.next
+			continue
+		case connectivity.Shutdown:
+			next := conn.next
+			if conn.streams == 0 {
+				removeConn(conn)
+				sp.idle--
+			}
+			conn = next
+			continue
+		case connectivity.TransientFailure:
+			next := conn.next
+			if conn.streams == 0 {
+				removeConn(conn)
+				conn.ClientConn.Close()
+				sp.idle--
+			}
+			conn = next
+			continue
+		case connectivity.Ready:
+		case connectivity.Idle:
+		}
+		//  a old conn
+		if now-conn.created > p.ttl {
+			next := conn.next
+			if conn.streams == 0 {
+				removeConn(conn)
+				conn.ClientConn.Close()
+				sp.idle--
+			}
+			conn = next
+			continue
+		}
+		//  a busy conn
+		if conn.streams >= p.maxStreams {
+			next := conn.next
+			removeConn(conn)
+			addConnAfter(conn, sp.busy)
+			conn = next
+			continue
+		}
+		//  a idle conn
+		if conn.streams == 0 {
+			sp.idle--
+		}
+		//  a good conn
+		conn.streams++
+		p.Unlock()
+		return conn, nil
+	}
+	p.Unlock()
+
+	//  create new conn
+	cc, err := grpc.Dial(addr, opts...)
+	if err != nil {
+		return nil, err
+	}
+	conn = &poolConn{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}
+
+	//  add conn to streams pool
+	p.Lock()
+	if sp.count < p.size {
+		addConnAfter(conn, sp.head)
+	}
+	p.Unlock()
+
+	return conn, nil
+}
+
+func (p *pool) release(addr string, conn *poolConn, err error) {
+	p.Lock()
+	p, sp, created := conn.pool, conn.sp, conn.created
+	//  try to add conn
+	if !conn.in && sp.count < p.size {
+		addConnAfter(conn, sp.head)
+	}
+	if !conn.in {
+		p.Unlock()
+		conn.ClientConn.Close()
+		return
+	}
+	//  a busy conn
+	if conn.streams >= p.maxStreams {
+		removeConn(conn)
+		addConnAfter(conn, sp.head)
+	}
+	conn.streams--
+	//  if streams == 0, we can do something
+	if conn.streams == 0 {
+		//  1. it has errored
+		//  2. too many idle conn or
+		//  3. conn is too old
+		now := time.Now().Unix()
+		if err != nil || sp.idle >= p.maxIdle || now-created > p.ttl {
+			removeConn(conn)
+			p.Unlock()
+			conn.ClientConn.Close()
+			return
+		}
+		sp.idle++
+	}
+	p.Unlock()
+	return
+}
+
+func (conn *poolConn) Close() {
+	conn.pool.release(conn.addr, conn, conn.err)
+}
+
+func removeConn(conn *poolConn) {
+	if conn.pre != nil {
+		conn.pre.next = conn.next
+	}
+	if conn.next != nil {
+		conn.next.pre = conn.pre
+	}
+	conn.pre = nil
+	conn.next = nil
+	conn.in = false
+	conn.sp.count--
+	return
+}
+
+func addConnAfter(conn *poolConn, after *poolConn) {
+	conn.next = after.next
+	conn.pre = after
+	if after.next != nil {
+		after.next.pre = conn
+	}
+	after.next = conn
+	conn.in = true
+	conn.sp.count++
+	return
+}

example/example.go

@@ -3,8 +3,11 @@ package main
 import (
 	"context"
 	"fmt"
-	"time"
 
+	"github.com/sirupsen/logrus"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/client"
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry/mdns"
 	"gitlab.bertha.cloud/partitio/lab/grpc/service"
 )
 
@@ -28,21 +31,29 @@ func (g *GreeterHandler) SayHelloStream(req *HelloStreamRequest, s Greeter_SayHe
 }
 
 func main() {
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	name := "greeter"
+	ctx, cancel := context.WithCancel(context.Background())
+	done := make(chan struct{})
+	ready := make(chan struct{})
 	defer cancel()
 	var svc service.Service
 	var err error
 	svc, err = service.New(
 		service.WithContext(ctx),
-		service.WithName("Greeting"),
+		service.WithName(name),
+		service.WithVersion("v0.0.1"),
+		service.WithAddress("0.0.0.0:9991"),
+		service.WithRegistry(mdns.NewRegistry()),
 		service.WithReflection(true),
 		service.WithSecure(true),
 		service.WithAfterStart(func() error {
 			fmt.Println("Server listening on", svc.Options().Address())
+			close(ready)
 			return nil
 		}),
 		service.WithAfterStop(func() error {
 			fmt.Println("Stopping server")
+			close(done)
 			return nil
 		}),
 	)
@@ -50,7 +61,30 @@ func main() {
 		panic(err)
 	}
 	RegisterGreeterServer(svc.Server(), &GreeterHandler{})
-	if err := svc.Start(); err != nil {
+	go func() {
-		panic(err)
+		if err := svc.Start(); err != nil {
+			panic(err)
+		}
+	}()
+	<-ready
+	s, err := client.New(
+		client.WithRegistry(mdns.NewRegistry()),
+		client.WithSecure(true),
+	)
+	if err != nil {
+		logrus.Fatal(err)
 	}
+	conn, err := s.Dial("greeter","v0.0.1")
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	g := NewGreeterClient(conn)
+	defer cancel()
+	res, err := g.SayHello(context.Background(), &HelloRequest{Name: "test"})
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	logrus.Infof("received message: %s", res.Message)
+	cancel()
+	<-done
 }

go.mod

@@ -3,13 +3,16 @@ module gitlab.bertha.cloud/partitio/lab/grpc
 go 1.13
 
 require (
-	github.com/golang/protobuf v1.3.2
+	github.com/golang/protobuf v1.4.0
+	github.com/google/uuid v1.1.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0
 	github.com/jinzhu/gorm v1.9.12
-	github.com/nats-io/stan.go v0.6.0 // indirect
+	github.com/miekg/dns v1.1.35
+	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/pflag v1.0.3
 	github.com/spf13/viper v1.6.2
-	go.uber.org/multierr v1.1.0
+	github.com/stretchr/testify v1.4.0
+	go.uber.org/multierr v1.3.0
+	golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2
 	google.golang.org/grpc v1.26.0
 )

go.sum

@@ -1,118 +1,377 @@
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registry/mdns/.gitignore

@@ -0,0 +1,23 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test

registry/mdns/client.go

@@ -0,0 +1,508 @@
+package mdns
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/miekg/dns"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// ServiceEntry is returned after we query for a service
+type ServiceEntry struct {
+	Name       string
+	Host       string
+	AddrV4     net.IP
+	AddrV6     net.IP
+	Port       int
+	Info       string
+	InfoFields []string
+	TTL        int
+	Type       uint16
+
+	Addr net.IP // @Deprecated
+
+	hasTXT bool
+	sent   bool
+}
+
+// complete is used to check if we have all the info we need
+func (s *ServiceEntry) complete() bool {
+
+	return (len(s.AddrV4) > 0 || len(s.AddrV6) > 0 || len(s.Addr) > 0) && s.Port != 0 && s.hasTXT
+}
+
+// QueryParam is used to customize how a Lookup is performed
+type QueryParam struct {
+	Service             string               // Service to lookup
+	Domain              string               // Lookup domain, default "local"
+	Type                uint16               // Lookup type, defaults to dns.TypePTR
+	Context             context.Context      // Context
+	Timeout             time.Duration        // Lookup timeout, default 1 second. Ignored if Context is provided
+	Interface           *net.Interface       // Multicast interface to use
+	Entries             chan<- *ServiceEntry // Entries Channel
+	WantUnicastResponse bool                 // Unicast response desired, as per 5.4 in RFC
+}
+
+// DefaultParams is used to return a default set of QueryParam's
+func DefaultParams(service string) *QueryParam {
+	return &QueryParam{
+		Service:             service,
+		Domain:              "local",
+		Timeout:             time.Second,
+		Entries:             make(chan *ServiceEntry),
+		WantUnicastResponse: false, // TODO(reddaly): Change this default.
+	}
+}
+
+// Query looks up a given service, in a domain, waiting at most
+// for a timeout before finishing the query. The results are streamed
+// to a channel. Sends will not block, so clients should make sure to
+// either read or buffer.
+func Query(params *QueryParam) error {
+	// Create a new client
+	client, err := newClient()
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	// Set the multicast interface
+	if params.Interface != nil {
+		if err := client.setInterface(params.Interface, false); err != nil {
+			return err
+		}
+	}
+
+	// Ensure defaults are set
+	if params.Domain == "" {
+		params.Domain = "local"
+	}
+
+	if params.Context == nil {
+		if params.Timeout == 0 {
+			params.Timeout = time.Second
+		}
+		params.Context, _ = context.WithTimeout(context.Background(), params.Timeout)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Run the query
+	return client.query(params)
+}
+
+// Listen listens indefinitely for multicast updates
+func Listen(entries chan<- *ServiceEntry, exit chan struct{}) error {
+	// Create a new client
+	client, err := newClient()
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	client.setInterface(nil, true)
+
+	// Start listening for response packets
+	msgCh := make(chan *dns.Msg, 32)
+
+	go client.recv(client.ipv4UnicastConn, msgCh)
+	go client.recv(client.ipv6UnicastConn, msgCh)
+	go client.recv(client.ipv4MulticastConn, msgCh)
+	go client.recv(client.ipv6MulticastConn, msgCh)
+
+	ip := make(map[string]*ServiceEntry)
+
+	for {
+		select {
+		case <-exit:
+			return nil
+		case <-client.closedCh:
+			return nil
+		case m := <-msgCh:
+			e := messageToEntry(m, ip)
+			if e == nil {
+				continue
+			}
+
+			// Check if this entry is complete
+			if e.complete() {
+				if e.sent {
+					continue
+				}
+				e.sent = true
+				entries <- e
+				ip = make(map[string]*ServiceEntry)
+			} else {
+				// Fire off a node specific query
+				m := new(dns.Msg)
+				m.SetQuestion(e.Name, dns.TypePTR)
+				m.RecursionDesired = false
+				if err := client.sendQuery(m); err != nil {
+					log.Printf("[ERR] mdns: Failed to query instance %s: %v", e.Name, err)
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+// Lookup is the same as Query, however it uses all the default parameters
+func Lookup(service string, entries chan<- *ServiceEntry) error {
+	params := DefaultParams(service)
+	params.Entries = entries
+	return Query(params)
+}
+
+// Client provides a query interface that can be used to
+// search for service providers using mDNS
+type client struct {
+	ipv4UnicastConn *net.UDPConn
+	ipv6UnicastConn *net.UDPConn
+
+	ipv4MulticastConn *net.UDPConn
+	ipv6MulticastConn *net.UDPConn
+
+	closed    bool
+	closedCh  chan struct{} // TODO(reddaly): This doesn't appear to be used.
+	closeLock sync.Mutex
+}
+
+// NewClient creates a new mdns Client that can be used to query
+// for records
+func newClient() (*client, error) {
+	// TODO(reddaly): At least attempt to bind to the port required in the spec.
+	// Create a IPv4 listener
+	uconn4, err4 := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
+	uconn6, err6 := net.ListenUDP("udp6", &net.UDPAddr{IP: net.IPv6zero, Port: 0})
+	if err4 != nil && err6 != nil {
+		log.Printf("[ERR] mdns: Failed to bind to udp port: %v %v", err4, err6)
+	}
+
+	if uconn4 == nil && uconn6 == nil {
+		return nil, fmt.Errorf("failed to bind to any unicast udp port")
+	}
+
+	if uconn4 == nil {
+		uconn4 = &net.UDPConn{}
+	}
+
+	if uconn6 == nil {
+		uconn6 = &net.UDPConn{}
+	}
+
+	mconn4, err4 := net.ListenUDP("udp4", mdnsWildcardAddrIPv4)
+	mconn6, err6 := net.ListenUDP("udp6", mdnsWildcardAddrIPv6)
+	if err4 != nil && err6 != nil {
+		log.Printf("[ERR] mdns: Failed to bind to udp port: %v %v", err4, err6)
+	}
+
+	if mconn4 == nil && mconn6 == nil {
+		return nil, fmt.Errorf("failed to bind to any multicast udp port")
+	}
+
+	if mconn4 == nil {
+		mconn4 = &net.UDPConn{}
+	}
+
+	if mconn6 == nil {
+		mconn6 = &net.UDPConn{}
+	}
+
+	p1 := ipv4.NewPacketConn(mconn4)
+	p2 := ipv6.NewPacketConn(mconn6)
+	p1.SetMulticastLoopback(true)
+	p2.SetMulticastLoopback(true)
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	var errCount1, errCount2 int
+
+	for _, iface := range ifaces {
+		if err := p1.JoinGroup(&iface, &net.UDPAddr{IP: mdnsGroupIPv4}); err != nil {
+			errCount1++
+		}
+		if err := p2.JoinGroup(&iface, &net.UDPAddr{IP: mdnsGroupIPv6}); err != nil {
+			errCount2++
+		}
+	}
+
+	if len(ifaces) == errCount1 && len(ifaces) == errCount2 {
+		return nil, fmt.Errorf("Failed to join multicast group on all interfaces!")
+	}
+
+	c := &client{
+		ipv4MulticastConn: mconn4,
+		ipv6MulticastConn: mconn6,
+		ipv4UnicastConn:   uconn4,
+		ipv6UnicastConn:   uconn6,
+		closedCh:          make(chan struct{}),
+	}
+	return c, nil
+}
+
+// Close is used to cleanup the client
+func (c *client) Close() error {
+	c.closeLock.Lock()
+	defer c.closeLock.Unlock()
+
+	if c.closed {
+		return nil
+	}
+	c.closed = true
+
+	close(c.closedCh)
+
+	if c.ipv4UnicastConn != nil {
+		c.ipv4UnicastConn.Close()
+	}
+	if c.ipv6UnicastConn != nil {
+		c.ipv6UnicastConn.Close()
+	}
+	if c.ipv4MulticastConn != nil {
+		c.ipv4MulticastConn.Close()
+	}
+	if c.ipv6MulticastConn != nil {
+		c.ipv6MulticastConn.Close()
+	}
+
+	return nil
+}
+
+// setInterface is used to set the query interface, uses sytem
+// default if not provided
+func (c *client) setInterface(iface *net.Interface, loopback bool) error {
+	p := ipv4.NewPacketConn(c.ipv4UnicastConn)
+	if err := p.JoinGroup(iface, &net.UDPAddr{IP: mdnsGroupIPv4}); err != nil {
+		return err
+	}
+	p2 := ipv6.NewPacketConn(c.ipv6UnicastConn)
+	if err := p2.JoinGroup(iface, &net.UDPAddr{IP: mdnsGroupIPv6}); err != nil {
+		return err
+	}
+	p = ipv4.NewPacketConn(c.ipv4MulticastConn)
+	if err := p.JoinGroup(iface, &net.UDPAddr{IP: mdnsGroupIPv4}); err != nil {
+		return err
+	}
+	p2 = ipv6.NewPacketConn(c.ipv6MulticastConn)
+	if err := p2.JoinGroup(iface, &net.UDPAddr{IP: mdnsGroupIPv6}); err != nil {
+		return err
+	}
+
+	if loopback {
+		p.SetMulticastLoopback(true)
+		p2.SetMulticastLoopback(true)
+	}
+
+	return nil
+}
+
+// query is used to perform a lookup and stream results
+func (c *client) query(params *QueryParam) error {
+	// Create the service name
+	serviceAddr := fmt.Sprintf("%s.%s.", trimDot(params.Service), trimDot(params.Domain))
+
+	// Start listening for response packets
+	msgCh := make(chan *dns.Msg, 32)
+	go c.recv(c.ipv4UnicastConn, msgCh)
+	go c.recv(c.ipv6UnicastConn, msgCh)
+	go c.recv(c.ipv4MulticastConn, msgCh)
+	go c.recv(c.ipv6MulticastConn, msgCh)
+
+	// Send the query
+	m := new(dns.Msg)
+	if params.Type == dns.TypeNone {
+		m.SetQuestion(serviceAddr, dns.TypePTR)
+	} else {
+		m.SetQuestion(serviceAddr, params.Type)
+	}
+	// RFC 6762, section 18.12.  Repurposing of Top Bit of qclass in Question
+	// Section
+	//
+	// In the Question Section of a Multicast DNS query, the top bit of the qclass
+	// field is used to indicate that unicast responses are preferred for this
+	// particular question.  (See Section 5.4.)
+	if params.WantUnicastResponse {
+		m.Question[0].Qclass |= 1 << 15
+	}
+	m.RecursionDesired = false
+	if err := c.sendQuery(m); err != nil {
+		return err
+	}
+
+	// Map the in-progress responses
+	inprogress := make(map[string]*ServiceEntry)
+
+	for {
+		select {
+		case resp := <-msgCh:
+			inp := messageToEntry(resp, inprogress)
+
+			if inp == nil {
+				continue
+			}
+			if len(resp.Question) == 0 || resp.Question[0].Name != m.Question[0].Name {
+				// discard anything which we've not asked for
+				continue
+			}
+
+			// Check if this entry is complete
+			if inp.complete() {
+				if inp.sent {
+					continue
+				}
+
+				inp.sent = true
+				select {
+				case params.Entries <- inp:
+				case <-params.Context.Done():
+					return nil
+				}
+			} else {
+				// Fire off a node specific query
+				m := new(dns.Msg)
+				m.SetQuestion(inp.Name, inp.Type)
+				m.RecursionDesired = false
+				if err := c.sendQuery(m); err != nil {
+					log.Printf("[ERR] mdns: Failed to query instance %s: %v", inp.Name, err)
+				}
+			}
+		case <-params.Context.Done():
+			return nil
+		}
+	}
+}
+
+// sendQuery is used to multicast a query out
+func (c *client) sendQuery(q *dns.Msg) error {
+	buf, err := q.Pack()
+	if err != nil {
+		return err
+	}
+	if c.ipv4UnicastConn != nil {
+		c.ipv4UnicastConn.WriteToUDP(buf, ipv4Addr)
+	}
+	if c.ipv6UnicastConn != nil {
+		c.ipv6UnicastConn.WriteToUDP(buf, ipv6Addr)
+	}
+	return nil
+}
+
+// recv is used to receive until we get a shutdown
+func (c *client) recv(l *net.UDPConn, msgCh chan *dns.Msg) {
+	if l == nil {
+		return
+	}
+	buf := make([]byte, 65536)
+	for {
+		c.closeLock.Lock()
+		if c.closed {
+			c.closeLock.Unlock()
+			return
+		}
+		c.closeLock.Unlock()
+		n, err := l.Read(buf)
+		if err != nil {
+			continue
+		}
+		msg := new(dns.Msg)
+		if err := msg.Unpack(buf[:n]); err != nil {
+			continue
+		}
+		select {
+		case msgCh <- msg:
+		case <-c.closedCh:
+			return
+		}
+	}
+}
+
+// ensureName is used to ensure the named node is in progress
+func ensureName(inprogress map[string]*ServiceEntry, name string, typ uint16) *ServiceEntry {
+	if inp, ok := inprogress[name]; ok {
+		return inp
+	}
+	inp := &ServiceEntry{
+		Name: name,
+		Type: typ,
+	}
+	inprogress[name] = inp
+	return inp
+}
+
+// alias is used to setup an alias between two entries
+func alias(inprogress map[string]*ServiceEntry, src, dst string, typ uint16) {
+	srcEntry := ensureName(inprogress, src, typ)
+	inprogress[dst] = srcEntry
+}
+
+func messageToEntry(m *dns.Msg, inprogress map[string]*ServiceEntry) *ServiceEntry {
+	var inp *ServiceEntry
+
+	for _, answer := range append(m.Answer, m.Extra...) {
+		// TODO(reddaly): Check that response corresponds to serviceAddr?
+		switch rr := answer.(type) {
+		case *dns.PTR:
+			// Create new entry for this
+			inp = ensureName(inprogress, rr.Ptr, rr.Hdr.Rrtype)
+			if inp.complete() {
+				continue
+			}
+		case *dns.SRV:
+			// Check for a target mismatch
+			if rr.Target != rr.Hdr.Name {
+				alias(inprogress, rr.Hdr.Name, rr.Target, rr.Hdr.Rrtype)
+			}
+
+			// Get the port
+			inp = ensureName(inprogress, rr.Hdr.Name, rr.Hdr.Rrtype)
+			if inp.complete() {
+				continue
+			}
+			inp.Host = rr.Target
+			inp.Port = int(rr.Port)
+		case *dns.TXT:
+			// Pull out the txt
+			inp = ensureName(inprogress, rr.Hdr.Name, rr.Hdr.Rrtype)
+			if inp.complete() {
+				continue
+			}
+			inp.Info = strings.Join(rr.Txt, "|")
+			inp.InfoFields = rr.Txt
+			inp.hasTXT = true
+		case *dns.A:
+			// Pull out the IP
+			inp = ensureName(inprogress, rr.Hdr.Name, rr.Hdr.Rrtype)
+			if inp.complete() {
+				continue
+			}
+			inp.Addr = rr.A // @Deprecated
+			inp.AddrV4 = rr.A
+		case *dns.AAAA:
+			// Pull out the IP
+			inp = ensureName(inprogress, rr.Hdr.Name, rr.Hdr.Rrtype)
+			if inp.complete() {
+				continue
+			}
+			inp.Addr = rr.AAAA // @Deprecated
+			inp.AddrV6 = rr.AAAA
+		}
+
+		if inp != nil {
+			inp.TTL = int(answer.Header().Ttl)
+		}
+	}
+
+	return inp
+}

registry/mdns/dns_sd.go

@@ -0,0 +1,84 @@
+package mdns
+
+import "github.com/miekg/dns"
+
+// DNSSDService is a service that complies with the DNS-SD (RFC 6762) and MDNS
+// (RFC 6762) specs for local, multicast-DNS-based discovery.
+//
+// DNSSDService implements the Zone interface and wraps an MDNSService instance.
+// To deploy an mDNS service that is compliant with DNS-SD, it's recommended to
+// register only the wrapped instance with the server.
+//
+// Example usage:
+//     service := &mdns.DNSSDService{
+//       MDNSService: &mdns.MDNSService{
+// 	       Instance: "My Foobar Service",
+// 	       Service: "_foobar._tcp",
+// 	       Port:    8000,
+//        }
+//      }
+//      server, err := mdns.NewServer(&mdns.Config{Zone: service})
+//      if err != nil {
+//        log.Fatalf("Error creating server: %v", err)
+//      }
+//      defer server.Shutdown()
+type DNSSDService struct {
+	MDNSService *MDNSService
+}
+
+// Records returns DNS records in response to a DNS question.
+//
+// This function returns the DNS response of the underlying MDNSService
+// instance.  It also returns a PTR record for a request for "
+// _services._dns-sd._udp.<Domain>", as described in section 9 of RFC 6763
+// ("Service Type Enumeration"), to allow browsing of the underlying MDNSService
+// instance.
+func (s *DNSSDService) Records(q dns.Question) []dns.RR {
+	var recs []dns.RR
+	if q.Name == "_services._dns-sd._udp."+s.MDNSService.Domain+"." {
+		recs = s.dnssdMetaQueryRecords(q)
+	}
+	return append(recs, s.MDNSService.Records(q)...)
+}
+
+// dnssdMetaQueryRecords returns the DNS records in response to a "meta-query"
+// issued to browse for DNS-SD services, as per section 9. of RFC6763.
+//
+// A meta-query has a name of the form "_services._dns-sd._udp.<Domain>" where
+// Domain is a fully-qualified domain, such as "local."
+func (s *DNSSDService) dnssdMetaQueryRecords(q dns.Question) []dns.RR {
+	// Intended behavior, as described in the RFC:
+	//     ...it may be useful for network administrators to find the list of
+	//     advertised service types on the network, even if those Service Names
+	//     are just opaque identifiers and not particularly informative in
+	//     isolation.
+	//
+	//     For this purpose, a special meta-query is defined.  A DNS query for PTR
+	//     records with the name "_services._dns-sd._udp.<Domain>" yields a set of
+	//     PTR records, where the rdata of each PTR record is the two-abel
+	//     <Service> name, plus the same domain, e.g., "_http._tcp.<Domain>".
+	//     Including the domain in the PTR rdata allows for slightly better name
+	//     compression in Unicast DNS responses, but only the first two labels are
+	//     relevant for the purposes of service type enumeration.  These two-label
+	//     service types can then be used to construct subsequent Service Instance
+	//     Enumeration PTR queries, in this <Domain> or others, to discover
+	//     instances of that service type.
+	return []dns.RR{
+		&dns.PTR{
+			Hdr: dns.RR_Header{
+				Name:   q.Name,
+				Rrtype: dns.TypePTR,
+				Class:  dns.ClassINET,
+				Ttl:    defaultTTL,
+			},
+			Ptr: s.MDNSService.serviceAddr,
+		},
+	}
+}
+
+// Announcement returns DNS records that should be broadcast during the initial
+// availability of the service, as described in section 8.3 of RFC 6762.
+// TODO(reddaly): Add this when Announcement is added to the mdns.Zone interface.
+//func (s *DNSSDService) Announcement() []dns.RR {
+//	return s.MDNSService.Announcement()
+//}

registry/mdns/dns_sd_test.go

@@ -0,0 +1,69 @@
+package mdns
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/miekg/dns"
+)
+
+type mockMDNSService struct{}
+
+func (s *mockMDNSService) Records(q dns.Question) []dns.RR {
+	return []dns.RR{
+		&dns.PTR{
+			Hdr: dns.RR_Header{
+				Name:   "fakerecord",
+				Rrtype: dns.TypePTR,
+				Class:  dns.ClassINET,
+				Ttl:    42,
+			},
+			Ptr: "fake.local.",
+		},
+	}
+}
+
+func (s *mockMDNSService) Announcement() []dns.RR {
+	return []dns.RR{
+		&dns.PTR{
+			Hdr: dns.RR_Header{
+				Name:   "fakeannounce",
+				Rrtype: dns.TypePTR,
+				Class:  dns.ClassINET,
+				Ttl:    42,
+			},
+			Ptr: "fake.local.",
+		},
+	}
+}
+
+func TestDNSSDServiceRecords(t *testing.T) {
+	s := &DNSSDService{
+		MDNSService: &MDNSService{
+			serviceAddr: "_foobar._tcp.local.",
+			Domain:      "local",
+		},
+	}
+	q := dns.Question{
+		Name:   "_services._dns-sd._udp.local.",
+		Qtype:  dns.TypePTR,
+		Qclass: dns.ClassINET,
+	}
+	recs := s.Records(q)
+	if got, want := len(recs), 1; got != want {
+		t.Fatalf("s.Records(%v) returned %v records, want %v", q, got, want)
+	}
+
+	want := dns.RR(&dns.PTR{
+		Hdr: dns.RR_Header{
+			Name:   "_services._dns-sd._udp.local.",
+			Rrtype: dns.TypePTR,
+			Class:  dns.ClassINET,
+			Ttl:    defaultTTL,
+		},
+		Ptr: "_foobar._tcp.local.",
+	})
+	if got := recs[0]; !reflect.DeepEqual(got, want) {
+		t.Errorf("s.Records()[0] = %v, want %v", got, want)
+	}
+}

registry/mdns/mdns.go

@@ -0,0 +1,626 @@
+package mdns
+
+import (
+	"bytes"
+	"compress/zlib"
+	"context"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/google/uuid"
+	"google.golang.org/grpc/resolver"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+	resolver2 "gitlab.bertha.cloud/partitio/lab/grpc/resolver"
+)
+
+var (
+	// use a .grpc domain rather than .local
+	mdnsDomain = "grpc"
+)
+
+type mdnsTxt struct {
+	Service   string
+	Version   string
+	Metadata  map[string]string
+}
+
+type mdnsEntry struct {
+	id   string
+	node *Server
+}
+
+type mdnsRegistry struct {
+	opts registry.Options
+	// the mdns domain
+	domain string
+
+	sync.Mutex
+	services map[string][]*mdnsEntry
+
+	mtx sync.RWMutex
+
+	// watchers
+	watchers map[string]*mdnsWatcher
+
+	// listener
+	listener chan *ServiceEntry
+}
+
+func (m *mdnsRegistry) ResolverBuilder() resolver.Builder {
+	return resolver2.New(m)
+}
+
+func (m *mdnsRegistry) Scheme() string {
+	panic("implement me")
+}
+
+type mdnsWatcher struct {
+	id   string
+	wo   registry.WatchOptions
+	ch   chan *ServiceEntry
+	exit chan struct{}
+	// the mdns domain
+	domain string
+	// the registry
+	registry *mdnsRegistry
+}
+
+func encode(txt *mdnsTxt) ([]string, error) {
+	b, err := json.Marshal(txt)
+	if err != nil {
+		return nil, err
+	}
+
+	var buf bytes.Buffer
+	defer buf.Reset()
+
+	w := zlib.NewWriter(&buf)
+	if _, err := w.Write(b); err != nil {
+		return nil, err
+	}
+	w.Close()
+
+	encoded := hex.EncodeToString(buf.Bytes())
+
+	// individual txt limit
+	if len(encoded) <= 255 {
+		return []string{encoded}, nil
+	}
+
+	// split encoded string
+	var record []string
+
+	for len(encoded) > 255 {
+		record = append(record, encoded[:255])
+		encoded = encoded[255:]
+	}
+
+	record = append(record, encoded)
+
+	return record, nil
+}
+
+func decode(record []string) (*mdnsTxt, error) {
+	encoded := strings.Join(record, "")
+
+	hr, err := hex.DecodeString(encoded)
+	if err != nil {
+		return nil, err
+	}
+
+	br := bytes.NewReader(hr)
+	zr, err := zlib.NewReader(br)
+	if err != nil {
+		return nil, err
+	}
+
+	rbuf, err := ioutil.ReadAll(zr)
+	if err != nil {
+		return nil, err
+	}
+
+	var txt *mdnsTxt
+
+	if err := json.Unmarshal(rbuf, &txt); err != nil {
+		return nil, err
+	}
+
+	return txt, nil
+}
+func newRegistry(opts ...registry.Option) registry.Registry {
+	options := registry.Options{
+		Context: context.Background(),
+		Timeout: time.Millisecond * 100,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	// set the domain
+	domain := mdnsDomain
+
+	d, ok := options.Context.Value("domain").(string)
+	if ok {
+		domain = d
+	}
+
+	reg := &mdnsRegistry{
+		opts:     options,
+		domain:   domain,
+		services: make(map[string][]*mdnsEntry),
+		watchers: make(map[string]*mdnsWatcher),
+	}
+	return reg
+}
+
+func (m *mdnsRegistry) Init(opts ...registry.Option) error {
+	for _, o := range opts {
+		o(&m.opts)
+	}
+	return nil
+}
+
+func (m *mdnsRegistry) Options() registry.Options {
+	return m.opts
+}
+
+func (m *mdnsRegistry) Register(service *registry.Service, opts ...registry.RegisterOption) error {
+	m.Lock()
+	defer m.Unlock()
+
+	entries, ok := m.services[service.Name]
+	// first entry, create wildcard used for list queries
+	if !ok {
+		s, err := NewMDNSService(
+			service.Name,
+			"_services",
+			m.domain+".",
+			"",
+			9999,
+			[]net.IP{net.ParseIP("0.0.0.0")},
+			nil,
+		)
+		if err != nil {
+			return err
+		}
+
+		srv, err := NewServer(&Config{Zone: &DNSSDService{MDNSService: s}})
+		if err != nil {
+			return err
+		}
+
+		// append the wildcard entry
+		entries = append(entries, &mdnsEntry{id: "*", node: srv})
+	}
+
+	var gerr error
+
+	for _, node := range service.Nodes {
+		var seen bool
+		var e *mdnsEntry
+
+		for _, entry := range entries {
+			if node.Id == entry.id {
+				seen = true
+				e = entry
+				break
+			}
+		}
+
+		// already registered, continue
+		if seen {
+			continue
+			// doesn't exist
+		} else {
+			e = &mdnsEntry{}
+		}
+
+		txt, err := encode(&mdnsTxt{
+			Service:   service.Name,
+			Version:   service.Version,
+			Metadata:  node.Metadata,
+		})
+
+		if err != nil {
+			gerr = err
+			continue
+		}
+
+		host, pt, err := net.SplitHostPort(node.Address)
+		if err != nil {
+			gerr = err
+			continue
+		}
+		port, _ := strconv.Atoi(pt)
+
+		// we got here, new node
+		s, err := NewMDNSService(
+			node.Id,
+			service.Name,
+			m.domain+".",
+			"",
+			port,
+			[]net.IP{net.ParseIP(host)},
+			txt,
+		)
+		if err != nil {
+			gerr = err
+			continue
+		}
+
+		srv, err := NewServer(&Config{Zone: s, LocalhostChecking: true})
+		if err != nil {
+			gerr = err
+			continue
+		}
+
+		e.id = node.Id
+		e.node = srv
+		entries = append(entries, e)
+	}
+
+	// save
+	m.services[service.Name] = entries
+
+	return gerr
+}
+
+func (m *mdnsRegistry) Deregister(service *registry.Service, opts ...registry.DeregisterOption) error {
+	m.Lock()
+	defer m.Unlock()
+
+	var newEntries []*mdnsEntry
+
+	// loop existing entries, check if any match, shutdown those that do
+	for _, entry := range m.services[service.Name] {
+		var remove bool
+
+		for _, node := range service.Nodes {
+			if node.Id == entry.id {
+				entry.node.Shutdown()
+				remove = true
+				break
+			}
+		}
+
+		// keep it?
+		if !remove {
+			newEntries = append(newEntries, entry)
+		}
+	}
+
+	// last entry is the wildcard for list queries. Remove it.
+	if len(newEntries) == 1 && newEntries[0].id == "*" {
+		newEntries[0].node.Shutdown()
+		delete(m.services, service.Name)
+	} else {
+		m.services[service.Name] = newEntries
+	}
+
+	return nil
+}
+
+func (m *mdnsRegistry) GetService(service string, opts ...registry.GetOption) ([]*registry.Service, error) {
+	serviceMap := make(map[string]*registry.Service)
+	entries := make(chan *ServiceEntry, 10)
+	done := make(chan bool)
+
+	p := DefaultParams(service)
+	// set context with timeout
+	var cancel context.CancelFunc
+	p.Context, cancel = context.WithTimeout(context.Background(), m.opts.Timeout)
+	defer cancel()
+	// set entries channel
+	p.Entries = entries
+	// set the domain
+	p.Domain = m.domain
+
+	go func() {
+		for {
+			select {
+			case e := <-entries:
+				// list record so skip
+				if p.Service == "_services" {
+					continue
+				}
+				if p.Domain != m.domain {
+					continue
+				}
+				if e.TTL == 0 {
+					continue
+				}
+
+				txt, err := decode(e.InfoFields)
+				if err != nil {
+					continue
+				}
+
+				if txt.Service != service {
+					continue
+				}
+
+				s, ok := serviceMap[txt.Version]
+				if !ok {
+					s = &registry.Service{
+						Name:      txt.Service,
+						Version:   txt.Version,
+					}
+				}
+				addr := ""
+				// prefer ipv4 addrs
+				if len(e.AddrV4) > 0 {
+					addr = e.AddrV4.String()
+					// else use ipv6
+				} else if len(e.AddrV6) > 0 {
+					addr = "[" + e.AddrV6.String() + "]"
+				} else {
+					continue
+				}
+				s.Nodes = append(s.Nodes, &registry.Node{
+					Id:       strings.TrimSuffix(e.Name, "."+p.Service+"."+p.Domain+"."),
+					Address:  fmt.Sprintf("%s:%d", addr, e.Port),
+					Metadata: txt.Metadata,
+				})
+
+				serviceMap[txt.Version] = s
+			case <-p.Context.Done():
+				close(done)
+				return
+			}
+		}
+	}()
+
+	// execute the query
+	if err := Query(p); err != nil {
+		return nil, err
+	}
+
+	// wait for completion
+	<-done
+
+	// create list and return
+	services := make([]*registry.Service, 0, len(serviceMap))
+
+	for _, service := range serviceMap {
+		services = append(services, service)
+	}
+
+	return services, nil
+}
+
+func (m *mdnsRegistry) ListServices(opts ...registry.ListOption) ([]*registry.Service, error) {
+	serviceMap := make(map[string]bool)
+	entries := make(chan *ServiceEntry, 10)
+	done := make(chan bool)
+
+	p := DefaultParams("_services")
+	// set context with timeout
+	var cancel context.CancelFunc
+	p.Context, cancel = context.WithTimeout(context.Background(), m.opts.Timeout)
+	defer cancel()
+	// set entries channel
+	p.Entries = entries
+	// set domain
+	p.Domain = m.domain
+
+	var services []*registry.Service
+
+	go func() {
+		for {
+			select {
+			case e := <-entries:
+				if e.TTL == 0 {
+					continue
+				}
+				if !strings.HasSuffix(e.Name, p.Domain+".") {
+					continue
+				}
+				name := strings.TrimSuffix(e.Name, "."+p.Service+"."+p.Domain+".")
+				if !serviceMap[name] {
+					serviceMap[name] = true
+					services = append(services, &registry.Service{Name: name})
+				}
+			case <-p.Context.Done():
+				close(done)
+				return
+			}
+		}
+	}()
+
+	// execute query
+	if err := Query(p); err != nil {
+		return nil, err
+	}
+
+	// wait till done
+	<-done
+
+	return services, nil
+}
+
+func (m *mdnsRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
+	var wo registry.WatchOptions
+	for _, o := range opts {
+		o(&wo)
+	}
+
+	md := &mdnsWatcher{
+		id:       uuid.New().String(),
+		wo:       wo,
+		ch:       make(chan *ServiceEntry, 32),
+		exit:     make(chan struct{}),
+		domain:   m.domain,
+		registry: m,
+	}
+
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
+
+	// save the watcher
+	m.watchers[md.id] = md
+
+	// check of the listener exists
+	if m.listener != nil {
+		return md, nil
+	}
+
+	// start the listener
+	go func() {
+		// go to infinity
+		for {
+			m.mtx.Lock()
+
+			// just return if there are no watchers
+			if len(m.watchers) == 0 {
+				m.listener = nil
+				m.mtx.Unlock()
+				return
+			}
+
+			// check existing listener
+			if m.listener != nil {
+				m.mtx.Unlock()
+				return
+			}
+
+			// reset the listener
+			exit := make(chan struct{})
+			ch := make(chan *ServiceEntry, 32)
+			m.listener = ch
+
+			m.mtx.Unlock()
+
+			// send messages to the watchers
+			go func() {
+				send := func(w *mdnsWatcher, e *ServiceEntry) {
+					select {
+					case w.ch <- e:
+					default:
+					}
+				}
+
+				for {
+					select {
+					case <-exit:
+						return
+					case e, ok := <-ch:
+						if !ok {
+							return
+						}
+						m.mtx.RLock()
+						// send service entry to all watchers
+						for _, w := range m.watchers {
+							send(w, e)
+						}
+						m.mtx.RUnlock()
+					}
+				}
+
+			}()
+
+			// start listening, blocking call
+			Listen(ch, exit)
+
+			// Listen has unblocked
+			// kill the saved listener
+			m.mtx.Lock()
+			m.listener = nil
+			close(ch)
+			m.mtx.Unlock()
+		}
+	}()
+
+	return md, nil
+}
+
+func (m *mdnsRegistry) String() string {
+	return "mdns"
+}
+
+func (m *mdnsWatcher) Next() (*registry.Result, error) {
+	for {
+		select {
+		case e := <-m.ch:
+			txt, err := decode(e.InfoFields)
+			if err != nil {
+				continue
+			}
+
+			if len(txt.Service) == 0 || len(txt.Version) == 0 {
+				continue
+			}
+
+			// Filter watch options
+			// wo.Service: Only keep services we care about
+			if len(m.wo.Service) > 0 && txt.Service != m.wo.Service {
+				continue
+			}
+			var action string
+			if e.TTL == 0 {
+				action = "delete"
+			} else {
+				action = "create"
+			}
+
+			service := &registry.Service{
+				Name:      txt.Service,
+				Version:   txt.Version,
+			}
+
+			// skip anything without the domain we care about
+			suffix := fmt.Sprintf(".%s.%s.", service.Name, m.domain)
+			if !strings.HasSuffix(e.Name, suffix) {
+				continue
+			}
+
+			var addr string
+			if len(e.AddrV4) > 0 {
+				addr = e.AddrV4.String()
+			} else if len(e.AddrV6) > 0 {
+				addr = "[" + e.AddrV6.String() + "]"
+			} else {
+				addr = e.Addr.String()
+			}
+
+			service.Nodes = append(service.Nodes, &registry.Node{
+				Id:       strings.TrimSuffix(e.Name, suffix),
+				Address:  fmt.Sprintf("%s:%d", addr, e.Port),
+				Metadata: txt.Metadata,
+			})
+
+			return &registry.Result{
+				Action:  action,
+				Service: service,
+			}, nil
+		case <-m.exit:
+			return nil, registry.ErrWatcherStopped
+		}
+	}
+}
+
+func (m *mdnsWatcher) Stop() {
+	select {
+	case <-m.exit:
+		return
+	default:
+		close(m.exit)
+		// remove self from the registry
+		m.registry.mtx.Lock()
+		delete(m.registry.watchers, m.id)
+		m.registry.mtx.Unlock()
+	}
+}
+
+// NewRegistry returns a new default registry which is mdns
+func NewRegistry(opts ...registry.Option) registry.Registry {
+	return newRegistry(opts...)
+}

registry/mdns/mdns_test.go

@@ -0,0 +1,32 @@
+package mdns
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+)
+
+func TestRegistry(t *testing.T) {
+	assert := assert.New(t)
+	reg := NewRegistry()
+	svc := &registry.Service{Name: "test", Nodes: []*registry.Node{{Id: "test-1", Address: "127.0.0.1:8888"}}}
+	if err := reg.Register(svc); err != nil {
+		t.Fatal(err)
+	}
+	svcs, err := reg.GetService("test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Len(svcs, 1)
+	assert.Contains(svcs, svc)
+	if err := reg.Deregister(svc); err != nil {
+		t.Fatal(err)
+	}
+	svcs, err = reg.ListServices()
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Len(svcs, 0)
+}

registry/mdns/server.go

@@ -0,0 +1,517 @@
+package mdns
+
+import (
+	"fmt"
+	"math/rand"
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/miekg/dns"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+var (
+	mdnsGroupIPv4 = net.ParseIP("224.0.0.251")
+	mdnsGroupIPv6 = net.ParseIP("ff02::fb")
+
+	// mDNS wildcard addresses
+	mdnsWildcardAddrIPv4 = &net.UDPAddr{
+		IP:   net.ParseIP("224.0.0.0"),
+		Port: 5353,
+	}
+	mdnsWildcardAddrIPv6 = &net.UDPAddr{
+		IP:   net.ParseIP("ff02::"),
+		Port: 5353,
+	}
+
+	// mDNS endpoint addresses
+	ipv4Addr = &net.UDPAddr{
+		IP:   mdnsGroupIPv4,
+		Port: 5353,
+	}
+	ipv6Addr = &net.UDPAddr{
+		IP:   mdnsGroupIPv6,
+		Port: 5353,
+	}
+)
+
+// GetMachineIP is a func which returns the outbound IP of this machine.
+// Used by the server to determine whether to attempt send the response on a local address
+type GetMachineIP func() net.IP
+
+// Config is used to configure the mDNS server
+type Config struct {
+	// Zone must be provided to support responding to queries
+	Zone Zone
+
+	// Iface if provided binds the multicast listener to the given
+	// interface. If not provided, the system default multicase interface
+	// is used.
+	Iface *net.Interface
+
+	// Port If it is not 0, replace the port 5353 with this port number.
+	Port int
+
+	// GetMachineIP is a function to return the IP of the local machine
+	GetMachineIP GetMachineIP
+	// LocalhostChecking if enabled asks the server to also send responses to 0.0.0.0 if the target IP
+	// is this host (as defined by GetMachineIP). Useful in case machine is on a VPN which blocks comms on non standard ports
+	LocalhostChecking bool
+}
+
+// Server is an mDNS server used to listen for mDNS queries and respond if we
+// have a matching local record
+type Server struct {
+	config *Config
+
+	ipv4List *net.UDPConn
+	ipv6List *net.UDPConn
+
+	shutdown     bool
+	shutdownCh   chan struct{}
+	shutdownLock sync.Mutex
+	wg           sync.WaitGroup
+
+	outboundIP net.IP
+}
+
+// NewServer is used to create a new mDNS server from a config
+func NewServer(config *Config) (*Server, error) {
+	setCustomPort(config.Port)
+
+	// Create the listeners
+	// Create wildcard connections (because :5353 can be already taken by other apps)
+	ipv4List, _ := net.ListenUDP("udp4", mdnsWildcardAddrIPv4)
+	ipv6List, _ := net.ListenUDP("udp6", mdnsWildcardAddrIPv6)
+	if ipv4List == nil && ipv6List == nil {
+		return nil, fmt.Errorf("[ERR] mdns: Failed to bind to any udp port!")
+	}
+
+	if ipv4List == nil {
+		ipv4List = &net.UDPConn{}
+	}
+	if ipv6List == nil {
+		ipv6List = &net.UDPConn{}
+	}
+
+	// Join multicast groups to receive announcements
+	p1 := ipv4.NewPacketConn(ipv4List)
+	p2 := ipv6.NewPacketConn(ipv6List)
+	p1.SetMulticastLoopback(true)
+	p2.SetMulticastLoopback(true)
+
+	if config.Iface != nil {
+		if err := p1.JoinGroup(config.Iface, &net.UDPAddr{IP: mdnsGroupIPv4}); err != nil {
+			return nil, err
+		}
+		if err := p2.JoinGroup(config.Iface, &net.UDPAddr{IP: mdnsGroupIPv6}); err != nil {
+			return nil, err
+		}
+	} else {
+		ifaces, err := net.Interfaces()
+		if err != nil {
+			return nil, err
+		}
+		errCount1, errCount2 := 0, 0
+		for _, iface := range ifaces {
+			if err := p1.JoinGroup(&iface, &net.UDPAddr{IP: mdnsGroupIPv4}); err != nil {
+				errCount1++
+			}
+			if err := p2.JoinGroup(&iface, &net.UDPAddr{IP: mdnsGroupIPv6}); err != nil {
+				errCount2++
+			}
+		}
+		if len(ifaces) == errCount1 && len(ifaces) == errCount2 {
+			return nil, fmt.Errorf("Failed to join multicast group on all interfaces!")
+		}
+	}
+
+	ipFunc := getOutboundIP
+	if config.GetMachineIP != nil {
+		ipFunc = config.GetMachineIP
+	}
+
+	s := &Server{
+		config:     config,
+		ipv4List:   ipv4List,
+		ipv6List:   ipv6List,
+		shutdownCh: make(chan struct{}),
+		outboundIP: ipFunc(),
+	}
+
+	go s.recv(s.ipv4List)
+	go s.recv(s.ipv6List)
+
+	s.wg.Add(1)
+	go s.probe()
+
+	return s, nil
+}
+
+// Shutdown is used to shutdown the listener
+func (s *Server) Shutdown() error {
+	s.shutdownLock.Lock()
+	defer s.shutdownLock.Unlock()
+
+	if s.shutdown {
+		return nil
+	}
+
+	s.shutdown = true
+	close(s.shutdownCh)
+	s.unregister()
+
+	if s.ipv4List != nil {
+		s.ipv4List.Close()
+	}
+	if s.ipv6List != nil {
+		s.ipv6List.Close()
+	}
+
+	s.wg.Wait()
+	return nil
+}
+
+// recv is a long running routine to receive packets from an interface
+func (s *Server) recv(c *net.UDPConn) {
+	if c == nil {
+		return
+	}
+	buf := make([]byte, 65536)
+	for {
+		s.shutdownLock.Lock()
+		if s.shutdown {
+			s.shutdownLock.Unlock()
+			return
+		}
+		s.shutdownLock.Unlock()
+		n, from, err := c.ReadFrom(buf)
+		if err != nil {
+			continue
+		}
+		if err := s.parsePacket(buf[:n], from); err != nil {
+			logrus.Errorf("[ERR] mdns: Failed to handle query: %v", err)
+		}
+	}
+}
+
+// parsePacket is used to parse an incoming packet
+func (s *Server) parsePacket(packet []byte, from net.Addr) error {
+	var msg dns.Msg
+	if err := msg.Unpack(packet); err != nil {
+		logrus.Errorf("[ERR] mdns: Failed to unpack packet: %v", err)
+		return err
+	}
+	// TODO: This is a bit of a hack
+	// We decided to ignore some mDNS answers for the time being
+	// See: https://tools.ietf.org/html/rfc6762#section-7.2
+	msg.Truncated = false
+	return s.handleQuery(&msg, from)
+}
+
+// handleQuery is used to handle an incoming query
+func (s *Server) handleQuery(query *dns.Msg, from net.Addr) error {
+	if query.Opcode != dns.OpcodeQuery {
+		// "In both multicast query and multicast response messages, the OPCODE MUST
+		// be zero on transmission (only standard queries are currently supported
+		// over multicast).  Multicast DNS messages received with an OPCODE other
+		// than zero MUST be silently ignored."  Note: OpcodeQuery == 0
+		return fmt.Errorf("mdns: received query with non-zero Opcode %v: %v", query.Opcode, *query)
+	}
+	if query.Rcode != 0 {
+		// "In both multicast query and multicast response messages, the Response
+		// Code MUST be zero on transmission.  Multicast DNS messages received with
+		// non-zero Response Codes MUST be silently ignored."
+		return fmt.Errorf("mdns: received query with non-zero Rcode %v: %v", query.Rcode, *query)
+	}
+
+	// TODO(reddaly): Handle "TC (Truncated) Bit":
+	//    In query messages, if the TC bit is set, it means that additional
+	//    Known-Answer records may be following shortly.  A responder SHOULD
+	//    record this fact, and wait for those additional Known-Answer records,
+	//    before deciding whether to respond.  If the TC bit is clear, it means
+	//    that the querying host has no additional Known Answers.
+	if query.Truncated {
+		return fmt.Errorf("[ERR] mdns: support for DNS requests with high truncated bit not implemented: %v", *query)
+	}
+
+	var unicastAnswer, multicastAnswer []dns.RR
+
+	// Handle each question
+	for _, q := range query.Question {
+		mrecs, urecs := s.handleQuestion(q)
+		multicastAnswer = append(multicastAnswer, mrecs...)
+		unicastAnswer = append(unicastAnswer, urecs...)
+	}
+
+	// See section 18 of RFC 6762 for rules about DNS headers.
+	resp := func(unicast bool) *dns.Msg {
+		// 18.1: ID (Query Identifier)
+		// 0 for multicast response, query.Id for unicast response
+		id := uint16(0)
+		if unicast {
+			id = query.Id
+		}
+
+		var answer []dns.RR
+		if unicast {
+			answer = unicastAnswer
+		} else {
+			answer = multicastAnswer
+		}
+		if len(answer) == 0 {
+			return nil
+		}
+
+		return &dns.Msg{
+			MsgHdr: dns.MsgHdr{
+				Id: id,
+
+				// 18.2: QR (Query/Response) Bit - must be set to 1 in response.
+				Response: true,
+
+				// 18.3: OPCODE - must be zero in response (OpcodeQuery == 0)
+				Opcode: dns.OpcodeQuery,
+
+				// 18.4: AA (Authoritative Answer) Bit - must be set to 1
+				Authoritative: true,
+
+				// The following fields must all be set to 0:
+				// 18.5: TC (TRUNCATED) Bit
+				// 18.6: RD (Recursion Desired) Bit
+				// 18.7: RA (Recursion Available) Bit
+				// 18.8: Z (Zero) Bit
+				// 18.9: AD (Authentic Data) Bit
+				// 18.10: CD (Checking Disabled) Bit
+				// 18.11: RCODE (Response Code)
+			},
+			// 18.12 pertains to questions (handled by handleQuestion)
+			// 18.13 pertains to resource records (handled by handleQuestion)
+
+			// 18.14: Name Compression - responses should be compressed (though see
+			// caveats in the RFC), so set the Compress bit (part of the dns library
+			// API, not part of the DNS packet) to true.
+			Compress: true,
+			Question: query.Question,
+			Answer:   answer,
+		}
+	}
+
+	if mresp := resp(false); mresp != nil {
+		if err := s.sendResponse(mresp, from); err != nil {
+			return fmt.Errorf("mdns: error sending multicast response: %v", err)
+		}
+	}
+	if uresp := resp(true); uresp != nil {
+		if err := s.sendResponse(uresp, from); err != nil {
+			return fmt.Errorf("mdns: error sending unicast response: %v", err)
+		}
+	}
+	return nil
+}
+
+// handleQuestion is used to handle an incoming question
+//
+// The response to a question may be transmitted over multicast, unicast, or
+// both.  The return values are DNS records for each transmission type.
+func (s *Server) handleQuestion(q dns.Question) (multicastRecs, unicastRecs []dns.RR) {
+	records := s.config.Zone.Records(q)
+	if len(records) == 0 {
+		return nil, nil
+	}
+
+	// Handle unicast and multicast responses.
+	// TODO(reddaly): The decision about sending over unicast vs. multicast is not
+	// yet fully compliant with RFC 6762.  For example, the unicast bit should be
+	// ignored if the records in question are close to TTL expiration.  For now,
+	// we just use the unicast bit to make the decision, as per the spec:
+	//     RFC 6762, section 18.12.  Repurposing of Top Bit of qclass in Question
+	//     Section
+	//
+	//     In the Question Section of a Multicast DNS query, the top bit of the
+	//     qclass field is used to indicate that unicast responses are preferred
+	//     for this particular question.  (See Section 5.4.)
+	if q.Qclass&(1<<15) != 0 {
+		return nil, records
+	}
+	return records, nil
+}
+
+func (s *Server) probe() {
+	defer s.wg.Done()
+
+	sd, ok := s.config.Zone.(*MDNSService)
+	if !ok {
+		return
+	}
+
+	name := fmt.Sprintf("%s.%s.%s.", sd.Instance, trimDot(sd.Service), trimDot(sd.Domain))
+
+	q := new(dns.Msg)
+	q.SetQuestion(name, dns.TypePTR)
+	q.RecursionDesired = false
+
+	srv := &dns.SRV{
+		Hdr: dns.RR_Header{
+			Name:   name,
+			Rrtype: dns.TypeSRV,
+			Class:  dns.ClassINET,
+			Ttl:    defaultTTL,
+		},
+		Priority: 0,
+		Weight:   0,
+		Port:     uint16(sd.Port),
+		Target:   sd.HostName,
+	}
+	txt := &dns.TXT{
+		Hdr: dns.RR_Header{
+			Name:   name,
+			Rrtype: dns.TypeTXT,
+			Class:  dns.ClassINET,
+			Ttl:    defaultTTL,
+		},
+		Txt: sd.TXT,
+	}
+	q.Ns = []dns.RR{srv, txt}
+
+	randomizer := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	for i := 0; i < 3; i++ {
+		if err := s.SendMulticast(q); err != nil {
+			logrus.Errorf("mdns: failed to send probe: %v", err)
+		}
+		time.Sleep(time.Duration(randomizer.Intn(250)) * time.Millisecond)
+	}
+
+	resp := new(dns.Msg)
+	resp.MsgHdr.Response = true
+
+	// set for query
+	q.SetQuestion(name, dns.TypeANY)
+
+	resp.Answer = append(resp.Answer, s.config.Zone.Records(q.Question[0])...)
+
+	// reset
+	q.SetQuestion(name, dns.TypePTR)
+
+	// From RFC6762
+	//    The Multicast DNS responder MUST send at least two unsolicited
+	//    responses, one second apart. To provide increased robustness against
+	//    packet loss, a responder MAY send up to eight unsolicited responses,
+	//    provided that the interval between unsolicited responses increases by
+	//    at least a factor of two with every response sent.
+	timeout := 1 * time.Second
+	timer := time.NewTimer(timeout)
+	for i := 0; i < 3; i++ {
+		if err := s.SendMulticast(resp); err != nil {
+			logrus.Errorf("mdns: failed to send announcement: %v", err)
+		}
+		select {
+		case <-timer.C:
+			timeout *= 2
+			timer.Reset(timeout)
+		case <-s.shutdownCh:
+			timer.Stop()
+			return
+		}
+	}
+}
+
+// SendMulticast us used to send a multicast response packet
+func (s *Server) SendMulticast(msg *dns.Msg) error {
+	buf, err := msg.Pack()
+	if err != nil {
+		return err
+	}
+	if s.ipv4List != nil {
+		s.ipv4List.WriteToUDP(buf, ipv4Addr)
+	}
+	if s.ipv6List != nil {
+		s.ipv6List.WriteToUDP(buf, ipv6Addr)
+	}
+	return nil
+}
+
+// sendResponse is used to send a response packet
+func (s *Server) sendResponse(resp *dns.Msg, from net.Addr) error {
+	// TODO(reddaly): Respect the unicast argument, and allow sending responses
+	// over multicast.
+	buf, err := resp.Pack()
+	if err != nil {
+		return err
+	}
+
+	// Determine the socket to send from
+	addr := from.(*net.UDPAddr)
+	conn := s.ipv4List
+	backupTarget := net.IPv4zero
+
+	if addr.IP.To4() == nil {
+		conn = s.ipv6List
+		backupTarget = net.IPv6zero
+	}
+	_, err = conn.WriteToUDP(buf, addr)
+	// If the address we're responding to is this machine then we can also attempt sending on 0.0.0.0
+	// This covers the case where this machine is using a VPN and certain ports are blocked so the response never gets there
+	// Sending two responses is OK
+	if s.config.LocalhostChecking && addr.IP.Equal(s.outboundIP) {
+		// ignore any errors, this is best efforts
+		conn.WriteToUDP(buf, &net.UDPAddr{IP: backupTarget, Port: addr.Port})
+	}
+	return err
+
+}
+
+func (s *Server) unregister() error {
+	sd, ok := s.config.Zone.(*MDNSService)
+	if !ok {
+		return nil
+	}
+
+	atomic.StoreUint32(&sd.TTL, 0)
+	name := fmt.Sprintf("%s.%s.%s.", sd.Instance, trimDot(sd.Service), trimDot(sd.Domain))
+
+	q := new(dns.Msg)
+	q.SetQuestion(name, dns.TypeANY)
+
+	resp := new(dns.Msg)
+	resp.MsgHdr.Response = true
+	resp.Answer = append(resp.Answer, s.config.Zone.Records(q.Question[0])...)
+
+	return s.SendMulticast(resp)
+}
+
+func setCustomPort(port int) {
+	if port != 0 {
+		if mdnsWildcardAddrIPv4.Port != port {
+			mdnsWildcardAddrIPv4.Port = port
+		}
+		if mdnsWildcardAddrIPv6.Port != port {
+			mdnsWildcardAddrIPv6.Port = port
+		}
+		if ipv4Addr.Port != port {
+			ipv4Addr.Port = port
+		}
+		if ipv6Addr.Port != port {
+			ipv6Addr.Port = port
+		}
+	}
+}
+
+// getOutboundIP returns the IP address of this machine as seen when dialling out
+func getOutboundIP() net.IP {
+	conn, err := net.Dial("udp", "8.8.8.8:80")
+	if err != nil {
+		// no net connectivity maybe so fallback
+		return nil
+	}
+	defer conn.Close()
+
+	localAddr := conn.LocalAddr().(*net.UDPAddr)
+
+	return localAddr.IP
+}

registry/mdns/server_test.go

@@ -0,0 +1,61 @@
+package mdns
+
+import (
+	"testing"
+	"time"
+)
+
+func TestServer_StartStop(t *testing.T) {
+	s := makeService(t)
+	serv, err := NewServer(&Config{Zone: s, LocalhostChecking: true})
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer serv.Shutdown()
+}
+
+func TestServer_Lookup(t *testing.T) {
+	serv, err := NewServer(&Config{Zone: makeServiceWithServiceName(t, "_foobar._tcp"), LocalhostChecking: true})
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer serv.Shutdown()
+
+	entries := make(chan *ServiceEntry, 1)
+	found := false
+	doneCh := make(chan struct{})
+	go func() {
+		select {
+		case e := <-entries:
+			if e.Name != "hostname._foobar._tcp.local." {
+				t.Fatalf("bad: %v", e)
+			}
+			if e.Port != 80 {
+				t.Fatalf("bad: %v", e)
+			}
+			if e.Info != "Local web server" {
+				t.Fatalf("bad: %v", e)
+			}
+			found = true
+
+		case <-time.After(80 * time.Millisecond):
+			t.Fatalf("timeout")
+		}
+		close(doneCh)
+	}()
+
+	params := &QueryParam{
+		Service: "_foobar._tcp",
+		Domain:  "local",
+		Timeout: 50 * time.Millisecond,
+		Entries: entries,
+	}
+	err = Query(params)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	<-doneCh
+	if !found {
+		t.Fatalf("record not found")
+	}
+}

registry/mdns/zone.go

@@ -0,0 +1,309 @@
+package mdns
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strings"
+	"sync/atomic"
+
+	"github.com/miekg/dns"
+)
+
+const (
+	// defaultTTL is the default TTL value in returned DNS records in seconds.
+	defaultTTL = 120
+)
+
+// Zone is the interface used to integrate with the server and
+// to serve records dynamically
+type Zone interface {
+	// Records returns DNS records in response to a DNS question.
+	Records(q dns.Question) []dns.RR
+}
+
+// MDNSService is used to export a named service by implementing a Zone
+type MDNSService struct {
+	Instance     string   // Instance name (e.g. "hostService name")
+	Service      string   // Service name (e.g. "_http._tcp.")
+	Domain       string   // If blank, assumes "local"
+	HostName     string   // Host machine DNS name (e.g. "mymachine.net.")
+	Port         int      // Service Port
+	IPs          []net.IP // IP addresses for the service's host
+	TXT          []string // Service TXT records
+	TTL          uint32
+	serviceAddr  string // Fully qualified service address
+	instanceAddr string // Fully qualified instance address
+	enumAddr     string // _services._dns-sd._udp.<domain>
+}
+
+// validateFQDN returns an error if the passed string is not a fully qualified
+// hdomain name (more specifically, a hostname).
+func validateFQDN(s string) error {
+	if len(s) == 0 {
+		return fmt.Errorf("FQDN must not be blank")
+	}
+	if s[len(s)-1] != '.' {
+		return fmt.Errorf("FQDN must end in period: %s", s)
+	}
+	// TODO(reddaly): Perform full validation.
+
+	return nil
+}
+
+// NewMDNSService returns a new instance of MDNSService.
+//
+// If domain, hostName, or ips is set to the zero value, then a default value
+// will be inferred from the operating system.
+//
+// TODO(reddaly): This interface may need to change to account for "unique
+// record" conflict rules of the mDNS protocol.  Upon startup, the server should
+// check to ensure that the instance name does not conflict with other instance
+// names, and, if required, select a new name.  There may also be conflicting
+// hostName A/AAAA records.
+func NewMDNSService(instance, service, domain, hostName string, port int, ips []net.IP, txt []string) (*MDNSService, error) {
+	// Sanity check inputs
+	if instance == "" {
+		return nil, fmt.Errorf("missing service instance name")
+	}
+	if service == "" {
+		return nil, fmt.Errorf("missing service name")
+	}
+	if port == 0 {
+		return nil, fmt.Errorf("missing service port")
+	}
+
+	// Set default domain
+	if domain == "" {
+		domain = "local."
+	}
+	if err := validateFQDN(domain); err != nil {
+		return nil, fmt.Errorf("domain %q is not a fully-qualified domain name: %v", domain, err)
+	}
+
+	// Get host information if no host is specified.
+	if hostName == "" {
+		var err error
+		hostName, err = os.Hostname()
+		if err != nil {
+			return nil, fmt.Errorf("could not determine host: %v", err)
+		}
+		hostName = fmt.Sprintf("%s.", hostName)
+	}
+	if err := validateFQDN(hostName); err != nil {
+		return nil, fmt.Errorf("hostName %q is not a fully-qualified domain name: %v", hostName, err)
+	}
+
+	if len(ips) == 0 {
+		var err error
+		ips, err = net.LookupIP(trimDot(hostName))
+		if err != nil {
+			// Try appending the host domain suffix and lookup again
+			// (required for Linux-based hosts)
+			tmpHostName := fmt.Sprintf("%s%s", hostName, domain)
+
+			ips, err = net.LookupIP(trimDot(tmpHostName))
+
+			if err != nil {
+				return nil, fmt.Errorf("could not determine host IP addresses for %s", hostName)
+			}
+		}
+	}
+	for _, ip := range ips {
+		if ip.To4() == nil && ip.To16() == nil {
+			return nil, fmt.Errorf("invalid IP address in IPs list: %v", ip)
+		}
+	}
+
+	return &MDNSService{
+		Instance:     instance,
+		Service:      service,
+		Domain:       domain,
+		HostName:     hostName,
+		Port:         port,
+		IPs:          ips,
+		TXT:          txt,
+		TTL:          defaultTTL,
+		serviceAddr:  fmt.Sprintf("%s.%s.", trimDot(service), trimDot(domain)),
+		instanceAddr: fmt.Sprintf("%s.%s.%s.", instance, trimDot(service), trimDot(domain)),
+		enumAddr:     fmt.Sprintf("_services._dns-sd._udp.%s.", trimDot(domain)),
+	}, nil
+}
+
+// trimDot is used to trim the dots from the start or end of a string
+func trimDot(s string) string {
+	return strings.Trim(s, ".")
+}
+
+// Records returns DNS records in response to a DNS question.
+func (m *MDNSService) Records(q dns.Question) []dns.RR {
+	switch q.Name {
+	case m.enumAddr:
+		return m.serviceEnum(q)
+	case m.serviceAddr:
+		return m.serviceRecords(q)
+	case m.instanceAddr:
+		return m.instanceRecords(q)
+	case m.HostName:
+		if q.Qtype == dns.TypeA || q.Qtype == dns.TypeAAAA {
+			return m.instanceRecords(q)
+		}
+		fallthrough
+	default:
+		return nil
+	}
+}
+
+func (m *MDNSService) serviceEnum(q dns.Question) []dns.RR {
+	switch q.Qtype {
+	case dns.TypeANY:
+		fallthrough
+	case dns.TypePTR:
+		rr := &dns.PTR{
+			Hdr: dns.RR_Header{
+				Name:   q.Name,
+				Rrtype: dns.TypePTR,
+				Class:  dns.ClassINET,
+				Ttl:    atomic.LoadUint32(&m.TTL),
+			},
+			Ptr: m.serviceAddr,
+		}
+		return []dns.RR{rr}
+	default:
+		return nil
+	}
+}
+
+// serviceRecords is called when the query matches the service name
+func (m *MDNSService) serviceRecords(q dns.Question) []dns.RR {
+	switch q.Qtype {
+	case dns.TypeANY:
+		fallthrough
+	case dns.TypePTR:
+		// Build a PTR response for the service
+		rr := &dns.PTR{
+			Hdr: dns.RR_Header{
+				Name:   q.Name,
+				Rrtype: dns.TypePTR,
+				Class:  dns.ClassINET,
+				Ttl:    atomic.LoadUint32(&m.TTL),
+			},
+			Ptr: m.instanceAddr,
+		}
+		servRec := []dns.RR{rr}
+
+		// Get the instance records
+		instRecs := m.instanceRecords(dns.Question{
+			Name:  m.instanceAddr,
+			Qtype: dns.TypeANY,
+		})
+
+		// Return the service record with the instance records
+		return append(servRec, instRecs...)
+	default:
+		return nil
+	}
+}
+
+// serviceRecords is called when the query matches the instance name
+func (m *MDNSService) instanceRecords(q dns.Question) []dns.RR {
+	switch q.Qtype {
+	case dns.TypeANY:
+		// Get the SRV, which includes A and AAAA
+		recs := m.instanceRecords(dns.Question{
+			Name:  m.instanceAddr,
+			Qtype: dns.TypeSRV,
+		})
+
+		// Add the TXT record
+		recs = append(recs, m.instanceRecords(dns.Question{
+			Name:  m.instanceAddr,
+			Qtype: dns.TypeTXT,
+		})...)
+		return recs
+
+	case dns.TypeA:
+		var rr []dns.RR
+		for _, ip := range m.IPs {
+			if ip4 := ip.To4(); ip4 != nil {
+				rr = append(rr, &dns.A{
+					Hdr: dns.RR_Header{
+						Name:   m.HostName,
+						Rrtype: dns.TypeA,
+						Class:  dns.ClassINET,
+						Ttl:    atomic.LoadUint32(&m.TTL),
+					},
+					A: ip4,
+				})
+			}
+		}
+		return rr
+
+	case dns.TypeAAAA:
+		var rr []dns.RR
+		for _, ip := range m.IPs {
+			if ip.To4() != nil {
+				// TODO(reddaly): IPv4 addresses could be encoded in IPv6 format and
+				// putinto AAAA records, but the current logic puts ipv4-encodable
+				// addresses into the A records exclusively.  Perhaps this should be
+				// configurable?
+				continue
+			}
+
+			if ip16 := ip.To16(); ip16 != nil {
+				rr = append(rr, &dns.AAAA{
+					Hdr: dns.RR_Header{
+						Name:   m.HostName,
+						Rrtype: dns.TypeAAAA,
+						Class:  dns.ClassINET,
+						Ttl:    atomic.LoadUint32(&m.TTL),
+					},
+					AAAA: ip16,
+				})
+			}
+		}
+		return rr
+
+	case dns.TypeSRV:
+		// Create the SRV Record
+		srv := &dns.SRV{
+			Hdr: dns.RR_Header{
+				Name:   q.Name,
+				Rrtype: dns.TypeSRV,
+				Class:  dns.ClassINET,
+				Ttl:    atomic.LoadUint32(&m.TTL),
+			},
+			Priority: 10,
+			Weight:   1,
+			Port:     uint16(m.Port),
+			Target:   m.HostName,
+		}
+		recs := []dns.RR{srv}
+
+		// Add the A record
+		recs = append(recs, m.instanceRecords(dns.Question{
+			Name:  m.instanceAddr,
+			Qtype: dns.TypeA,
+		})...)
+
+		// Add the AAAA record
+		recs = append(recs, m.instanceRecords(dns.Question{
+			Name:  m.instanceAddr,
+			Qtype: dns.TypeAAAA,
+		})...)
+		return recs
+
+	case dns.TypeTXT:
+		txt := &dns.TXT{
+			Hdr: dns.RR_Header{
+				Name:   q.Name,
+				Rrtype: dns.TypeTXT,
+				Class:  dns.ClassINET,
+				Ttl:    atomic.LoadUint32(&m.TTL),
+			},
+			Txt: m.TXT,
+		}
+		return []dns.RR{txt}
+	}
+	return nil
+}

registry/mdns/zone_test.go

@@ -0,0 +1,275 @@
+package mdns
+
+import (
+	"bytes"
+	"net"
+	"reflect"
+	"testing"
+
+	"github.com/miekg/dns"
+)
+
+func makeService(t *testing.T) *MDNSService {
+	return makeServiceWithServiceName(t, "_http._tcp")
+}
+
+func makeServiceWithServiceName(t *testing.T, service string) *MDNSService {
+	m, err := NewMDNSService(
+		"hostname",
+		service,
+		"local.",
+		"testhost.",
+		80, // port
+		[]net.IP{net.IP([]byte{192, 168, 0, 42}), net.ParseIP("2620:0:1000:1900:b0c2:d0b2:c411:18bc")},
+		[]string{"Local web server"}) // TXT
+
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	return m
+}
+
+func TestNewMDNSService_BadParams(t *testing.T) {
+	for _, test := range []struct {
+		testName string
+		hostName string
+		domain   string
+	}{
+		{
+			"NewMDNSService should fail when passed hostName that is not a legal fully-qualified domain name",
+			"hostname", // not legal FQDN - should be "hostname." or "hostname.local.", etc.
+			"local.",   // legal
+		},
+		{
+			"NewMDNSService should fail when passed domain that is not a legal fully-qualified domain name",
+			"hostname.", // legal
+			"local",     // should be "local."
+		},
+	} {
+		_, err := NewMDNSService(
+			"instance name",
+			"_http._tcp",
+			test.domain,
+			test.hostName,
+			80, // port
+			[]net.IP{net.IP([]byte{192, 168, 0, 42})},
+			[]string{"Local web server"}) // TXT
+		if err == nil {
+			t.Fatalf("%s: error expected, but got none", test.testName)
+		}
+	}
+}
+
+func TestMDNSService_BadAddr(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "random",
+		Qtype: dns.TypeANY,
+	}
+	recs := s.Records(q)
+	if len(recs) != 0 {
+		t.Fatalf("bad: %v", recs)
+	}
+}
+
+func TestMDNSService_ServiceAddr(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "_http._tcp.local.",
+		Qtype: dns.TypeANY,
+	}
+	recs := s.Records(q)
+	if got, want := len(recs), 5; got != want {
+		t.Fatalf("got %d records, want %d: %v", got, want, recs)
+	}
+
+	if ptr, ok := recs[0].(*dns.PTR); !ok {
+		t.Errorf("recs[0] should be PTR record, got: %v, all records: %v", recs[0], recs)
+	} else if got, want := ptr.Ptr, "hostname._http._tcp.local."; got != want {
+		t.Fatalf("bad PTR record %v: got %v, want %v", ptr, got, want)
+	}
+
+	if _, ok := recs[1].(*dns.SRV); !ok {
+		t.Errorf("recs[1] should be SRV record, got: %v, all reccords: %v", recs[1], recs)
+	}
+	if _, ok := recs[2].(*dns.A); !ok {
+		t.Errorf("recs[2] should be A record, got: %v, all records: %v", recs[2], recs)
+	}
+	if _, ok := recs[3].(*dns.AAAA); !ok {
+		t.Errorf("recs[3] should be AAAA record, got: %v, all records: %v", recs[3], recs)
+	}
+	if _, ok := recs[4].(*dns.TXT); !ok {
+		t.Errorf("recs[4] should be TXT record, got: %v, all records: %v", recs[4], recs)
+	}
+
+	q.Qtype = dns.TypePTR
+	if recs2 := s.Records(q); !reflect.DeepEqual(recs, recs2) {
+		t.Fatalf("PTR question should return same result as ANY question: ANY => %v, PTR => %v", recs, recs2)
+	}
+}
+
+func TestMDNSService_InstanceAddr_ANY(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "hostname._http._tcp.local.",
+		Qtype: dns.TypeANY,
+	}
+	recs := s.Records(q)
+	if len(recs) != 4 {
+		t.Fatalf("bad: %v", recs)
+	}
+	if _, ok := recs[0].(*dns.SRV); !ok {
+		t.Fatalf("bad: %v", recs[0])
+	}
+	if _, ok := recs[1].(*dns.A); !ok {
+		t.Fatalf("bad: %v", recs[1])
+	}
+	if _, ok := recs[2].(*dns.AAAA); !ok {
+		t.Fatalf("bad: %v", recs[2])
+	}
+	if _, ok := recs[3].(*dns.TXT); !ok {
+		t.Fatalf("bad: %v", recs[3])
+	}
+}
+
+func TestMDNSService_InstanceAddr_SRV(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "hostname._http._tcp.local.",
+		Qtype: dns.TypeSRV,
+	}
+	recs := s.Records(q)
+	if len(recs) != 3 {
+		t.Fatalf("bad: %v", recs)
+	}
+	srv, ok := recs[0].(*dns.SRV)
+	if !ok {
+		t.Fatalf("bad: %v", recs[0])
+	}
+	if _, ok := recs[1].(*dns.A); !ok {
+		t.Fatalf("bad: %v", recs[1])
+	}
+	if _, ok := recs[2].(*dns.AAAA); !ok {
+		t.Fatalf("bad: %v", recs[2])
+	}
+
+	if srv.Port != uint16(s.Port) {
+		t.Fatalf("bad: %v", recs[0])
+	}
+}
+
+func TestMDNSService_InstanceAddr_A(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "hostname._http._tcp.local.",
+		Qtype: dns.TypeA,
+	}
+	recs := s.Records(q)
+	if len(recs) != 1 {
+		t.Fatalf("bad: %v", recs)
+	}
+	a, ok := recs[0].(*dns.A)
+	if !ok {
+		t.Fatalf("bad: %v", recs[0])
+	}
+	if !bytes.Equal(a.A, []byte{192, 168, 0, 42}) {
+		t.Fatalf("bad: %v", recs[0])
+	}
+}
+
+func TestMDNSService_InstanceAddr_AAAA(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "hostname._http._tcp.local.",
+		Qtype: dns.TypeAAAA,
+	}
+	recs := s.Records(q)
+	if len(recs) != 1 {
+		t.Fatalf("bad: %v", recs)
+	}
+	a4, ok := recs[0].(*dns.AAAA)
+	if !ok {
+		t.Fatalf("bad: %v", recs[0])
+	}
+	ip6 := net.ParseIP("2620:0:1000:1900:b0c2:d0b2:c411:18bc")
+	if got := len(ip6); got != net.IPv6len {
+		t.Fatalf("test IP failed to parse (len = %d, want %d)", got, net.IPv6len)
+	}
+	if !bytes.Equal(a4.AAAA, ip6) {
+		t.Fatalf("bad: %v", recs[0])
+	}
+}
+
+func TestMDNSService_InstanceAddr_TXT(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "hostname._http._tcp.local.",
+		Qtype: dns.TypeTXT,
+	}
+	recs := s.Records(q)
+	if len(recs) != 1 {
+		t.Fatalf("bad: %v", recs)
+	}
+	txt, ok := recs[0].(*dns.TXT)
+	if !ok {
+		t.Fatalf("bad: %v", recs[0])
+	}
+	if got, want := txt.Txt, s.TXT; !reflect.DeepEqual(got, want) {
+		t.Fatalf("TXT record mismatch for %v: got %v, want %v", recs[0], got, want)
+	}
+}
+
+func TestMDNSService_HostNameQuery(t *testing.T) {
+	s := makeService(t)
+	for _, test := range []struct {
+		q    dns.Question
+		want []dns.RR
+	}{
+		{
+			dns.Question{Name: "testhost.", Qtype: dns.TypeA},
+			[]dns.RR{&dns.A{
+				Hdr: dns.RR_Header{
+					Name:   "testhost.",
+					Rrtype: dns.TypeA,
+					Class:  dns.ClassINET,
+					Ttl:    120,
+				},
+				A: net.IP([]byte{192, 168, 0, 42}),
+			}},
+		},
+		{
+			dns.Question{Name: "testhost.", Qtype: dns.TypeAAAA},
+			[]dns.RR{&dns.AAAA{
+				Hdr: dns.RR_Header{
+					Name:   "testhost.",
+					Rrtype: dns.TypeAAAA,
+					Class:  dns.ClassINET,
+					Ttl:    120,
+				},
+				AAAA: net.ParseIP("2620:0:1000:1900:b0c2:d0b2:c411:18bc"),
+			}},
+		},
+	} {
+		if got := s.Records(test.q); !reflect.DeepEqual(got, test.want) {
+			t.Errorf("hostname query failed: s.Records(%v) = %v, want %v", test.q, got, test.want)
+		}
+	}
+}
+
+func TestMDNSService_serviceEnum_PTR(t *testing.T) {
+	s := makeService(t)
+	q := dns.Question{
+		Name:  "_services._dns-sd._udp.local.",
+		Qtype: dns.TypePTR,
+	}
+	recs := s.Records(q)
+	if len(recs) != 1 {
+		t.Fatalf("bad: %v", recs)
+	}
+	if ptr, ok := recs[0].(*dns.PTR); !ok {
+		t.Errorf("recs[0] should be PTR record, got: %v, all records: %v", recs[0], recs)
+	} else if got, want := ptr.Ptr, "_http._tcp.local."; got != want {
+		t.Fatalf("bad PTR record %v: got %v, want %v", ptr, got, want)
+	}
+}

registry/noop/registry.go

@@ -0,0 +1,60 @@
+package noop
+
+import (
+	"google.golang.org/grpc/resolver"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+	resolver2 "gitlab.bertha.cloud/partitio/lab/grpc/resolver"
+)
+
+
+func New() registry.Registry {
+	return &noop{}
+}
+
+type noop struct {}
+
+func (n noop) ResolverBuilder() resolver.Builder {
+	return resolver2.New(n)
+}
+
+func (n noop) Init(option ...registry.Option) error {
+	return nil
+}
+
+func (n noop) Options() registry.Options {
+	return registry.Options{}
+}
+
+func (n noop) Register(service *registry.Service, option ...registry.RegisterOption) error {
+	return nil
+}
+
+func (n noop) Deregister(service *registry.Service, option ...registry.DeregisterOption) error {
+	return nil
+}
+
+func (n noop) GetService(s string, option ...registry.GetOption) ([]*registry.Service, error) {
+	return nil, nil
+}
+
+func (n noop) ListServices(option ...registry.ListOption) ([]*registry.Service, error) {
+	return nil, nil
+}
+
+func (n noop) Watch(option ...registry.WatchOption) (registry.Watcher, error) {
+	return noopWatcher{}, nil
+}
+
+func (n noop) String() string {
+	return "passthroug"
+}
+
+type noopWatcher struct {}
+
+func (n noopWatcher) Next() (*registry.Result, error) {
+	return &registry.Result{}, nil
+}
+
+func (n noopWatcher) Stop() {}
+

registry/options.go

@@ -0,0 +1,115 @@
+package registry
+
+import (
+	"context"
+	"crypto/tls"
+	"time"
+)
+
+type Options struct {
+	Addrs     []string
+	Timeout   time.Duration
+	Secure    bool
+	TLSConfig *tls.Config
+	// Other options for implementations of the interface
+	// can be stored in a context
+	Context context.Context
+}
+
+type RegisterOptions struct {
+	TTL time.Duration
+	// Other options for implementations of the interface
+	// can be stored in a context
+	Context context.Context
+}
+
+type WatchOptions struct {
+	// Specify a service to watch
+	// If blank, the watch is for all services
+	Service string
+	// Other options for implementations of the interface
+	// can be stored in a context
+	Context context.Context
+}
+
+type DeregisterOptions struct {
+	Context context.Context
+}
+
+type GetOptions struct {
+	Context context.Context
+}
+
+type ListOptions struct {
+	Context context.Context
+}
+
+// Addrs is the registry addresses to use
+func Addrs(addrs ...string) Option {
+	return func(o *Options) {
+		o.Addrs = addrs
+	}
+}
+
+func Timeout(t time.Duration) Option {
+	return func(o *Options) {
+		o.Timeout = t
+	}
+}
+
+// Secure communication with the registry
+func Secure(b bool) Option {
+	return func(o *Options) {
+		o.Secure = b
+	}
+}
+
+// Specify TLS Config
+func TLSConfig(t *tls.Config) Option {
+	return func(o *Options) {
+		o.TLSConfig = t
+	}
+}
+
+func RegisterTTL(t time.Duration) RegisterOption {
+	return func(o *RegisterOptions) {
+		o.TTL = t
+	}
+}
+
+func RegisterContext(ctx context.Context) RegisterOption {
+	return func(o *RegisterOptions) {
+		o.Context = ctx
+	}
+}
+
+// Watch a service
+func WatchService(name string) WatchOption {
+	return func(o *WatchOptions) {
+		o.Service = name
+	}
+}
+
+func WatchContext(ctx context.Context) WatchOption {
+	return func(o *WatchOptions) {
+		o.Context = ctx
+	}
+}
+
+func DeregisterContext(ctx context.Context) DeregisterOption {
+	return func(o *DeregisterOptions) {
+		o.Context = ctx
+	}
+}
+
+func GetContext(ctx context.Context) GetOption {
+	return func(o *GetOptions) {
+		o.Context = ctx
+	}
+}
+
+func ListContext(ctx context.Context) ListOption {
+	return func(o *ListOptions) {
+		o.Context = ctx
+	}
+}

registry/registry.go

@@ -0,0 +1,54 @@
+// Package registry is an interface for service discovery
+package registry
+
+import (
+	"errors"
+
+	"google.golang.org/grpc/resolver"
+)
+
+var (
+	// Not found error when GetService is called
+	ErrNotFound = errors.New("service not found")
+	// Watcher stopped error when watcher is stopped
+	ErrWatcherStopped = errors.New("watcher stopped")
+)
+
+// The registry provides an interface for service discovery
+// and an abstraction over varying implementations
+type Registry interface {
+	ResolverBuilder() resolver.Builder
+	Init(...Option) error
+	Options() Options
+	Register(*Service, ...RegisterOption) error
+	Deregister(*Service, ...DeregisterOption) error
+	GetService(string, ...GetOption) ([]*Service, error)
+	ListServices(...ListOption) ([]*Service, error)
+	Watch(...WatchOption) (Watcher, error)
+	String() string
+}
+
+type Service struct {
+	Name      string            `json:"name"`
+	Version   string            `json:"version"`
+	Metadata  map[string]string `json:"metadata"`
+	Nodes     []*Node           `json:"nodes"`
+}
+
+type Node struct {
+	Id       string            `json:"id"`
+	Address  string            `json:"address"`
+	Metadata map[string]string `json:"metadata"`
+}
+
+type Option func(*Options)
+
+type RegisterOption func(*RegisterOptions)
+
+type WatchOption func(*WatchOptions)
+
+type DeregisterOption func(*DeregisterOptions)
+
+type GetOption func(*GetOptions)
+
+type ListOption func(*ListOptions)

registry/watcher.go

@@ -0,0 +1,56 @@
+package registry
+
+import "time"
+
+// Watcher is an interface that returns updates
+// about services within the registry.
+type Watcher interface {
+	// Next is a blocking call
+	Next() (*Result, error)
+	Stop()
+}
+
+// Result is returned by a call to Next on
+// the watcher. Actions can be create, update, delete
+type Result struct {
+	Action  string
+	Service *Service
+}
+
+// EventType defines registry event type
+type EventType int
+
+const (
+	// Create is emitted when a new service is registered
+	Create EventType = iota
+	// Delete is emitted when an existing service is deregsitered
+	Delete
+	// Update is emitted when an existing servicec is updated
+	Update
+)
+
+// String returns human readable event type
+func (t EventType) String() string {
+	switch t {
+	case Create:
+		return "create"
+	case Delete:
+		return "delete"
+	case Update:
+		return "update"
+	default:
+		return "unknown"
+	}
+}
+
+// Event is registry event
+type Event struct {
+	// Id is registry id
+	Id string
+	// Type defines type of event
+	Type EventType
+	// Timestamp is event timestamp
+	Timestamp time.Time
+	// Service is registry service
+	Service *Service
+}

resolver/resolver.go

@@ -0,0 +1,86 @@
+package resolver
+
+import (
+	"strings"
+
+	"google.golang.org/grpc/resolver"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+)
+
+func New(reg registry.Registry) resolver.Builder {
+	return &builder{reg: reg}
+}
+
+type builder struct {
+	reg registry.Registry
+}
+
+func (r builder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
+	rslvr :=  &resolvr{reg: r.reg, target: target, cc: cc}
+	go rslvr.run()
+	return rslvr, nil
+}
+
+func (r builder) Scheme() string {
+	return r.reg.String()
+}
+
+type resolvr struct {
+	reg    registry.Registry
+	target resolver.Target
+	cc     resolver.ClientConn
+	addrs  []resolver.Address
+}
+
+func (r *resolvr) run() {
+	if r.reg.String() == "noop" {
+		return
+	}
+	var name, version string
+	parts := strings.Split(r.target.Endpoint, ":")
+	name = parts[0]
+	if len(parts) > 1 {
+		version = parts[1]
+	}
+	svc, err := r.reg.GetService(name)
+	if err != nil {
+		return
+	}
+	for _, v := range svc {
+		if v.Name != name || v.Version != version {
+			continue
+		}
+		for _, vv := range v.Nodes {
+			r.addrs = append(r.addrs, resolver.Address{Addr: vv.Address})
+		}
+	}
+	r.cc.UpdateState(resolver.State{Addresses: r.addrs})
+	w, err := r.reg.Watch(registry.WatchService(r.target.Endpoint))
+	if err != nil {
+		return
+	}
+	defer w.Stop()
+	for {
+		res, err := w.Next()
+		if err != nil {
+			return
+		}
+		// TODO(adphi): implement
+		switch res.Action {
+		case "create":
+
+		case "delete":
+
+		}
+		r.cc.UpdateState(resolver.State{Addresses: r.addrs})
+	}
+}
+
+func (r *resolvr) ResolveNow(options resolver.ResolveNowOptions) {
+	if r.reg.String() == "noop" {
+		r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint}}})
+	}
+}
+
+func (r *resolvr) Close() {}

service/options.go

@@ -6,12 +6,15 @@ import (
 	"crypto/x509"
 	"fmt"
 	"io/ioutil"
+	"net"
 
 	"github.com/jinzhu/gorm"
 	"go.uber.org/multierr"
 	"google.golang.org/grpc"
-	
+
 	"gitlab.bertha.cloud/partitio/lab/grpc/certs"
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+	"gitlab.bertha.cloud/partitio/lab/grpc/utils/addr"
 )
 
 /*
@@ -27,32 +30,34 @@ GLOBAL OPTIONS:
 	--ca_cert				  CA_CERT
 	--server_cert			  SERVER_CERT
 	--server_key			  SERVER_KEY
-	
+
    	--register_ttl            REGISTER_TTL
 	--register_interval       REGISTER_INTERVAL
-	
+
-	--server_address          SERVER_ADDRESS	   
+	--server_address          SERVER_ADDRESS
    	--server_name             SERVER_NAME
-	   
+
 	--broker                  BROKER
    	--broker_address          BROKER_ADDRESS
-	   
+
 	--registry                REGISTRY
    	--registry_address        REGISTRY_ADDRESS
-	   
+
 	--db_path                 DB_PATH
 */
 
 type Options interface {
 	Context() context.Context
 	Name() string
+	Version() string
 	Address() string
 	Reflection() bool
-	Secure() bool
 	CACert() string
 	Cert() string
 	Key() string
 	TLSConfig() *tls.Config
+	Secure() bool
+	Registry() registry.Registry
 	DB() *gorm.DB
 	BeforeStart() []func() error
 	AfterStart() []func() error
@@ -90,6 +95,18 @@ func WithName(name string) Option {
 	}
 }
 
+func WithVersion(version string) Option {
+	return func(o *options) {
+		o.version = version
+	}
+}
+
+func WithRegistry(registry registry.Registry) Option {
+	return func(o *options) {
+		o.registry = registry
+	}
+}
+
 // WithContext specifies a context for the service.
 // Can be used to signal shutdown of the service.
 // Can be used for extra option values.
@@ -215,6 +232,7 @@ func WithSubscriberInterceptor(w ...interface{}) Option {
 type options struct {
 	ctx        context.Context
 	name       string
+	version string
 	address    string
 	secure     bool
 	reflection bool
@@ -224,6 +242,8 @@ type options struct {
 	tlsConfig  *tls.Config
 	db         *gorm.DB
 
+	registry registry.Registry
+
 	beforeStart []func() error
 	afterStart  []func() error
 	beforeStop  []func() error
@@ -237,13 +257,17 @@ type options struct {
 	clientInterceptors       []grpc.UnaryClientInterceptor
 	streamClientInterceptors []grpc.StreamClientInterceptor
 
-	error error
+	error   error
 }
 
 func (o *options) Name() string {
 	return o.name
 }
 
+func (o *options) Version() string {
+	return o.version
+}
+
 func (o *options) Context() context.Context {
 	return o.ctx
 }
@@ -252,12 +276,12 @@ func (o *options) Address() string {
 	return o.address
 }
 
-func (o *options) Reflection() bool {
+func (o *options) Registry() registry.Registry {
-	return o.reflection
+	return o.registry
 }
 
-func (o *options) Secure() bool {
+func (o *options) Reflection() bool {
-	return o.secure
+	return o.reflection
 }
 
 func (o *options) CACert() string {
@@ -276,6 +300,10 @@ func (o *options) TLSConfig() *tls.Config {
 	return o.tlsConfig
 }
 
+func (o *options) Secure() bool {
+	return o.secure
+}
+
 func (o *options) DB() *gorm.DB {
 	return o.db
 }
@@ -317,20 +345,36 @@ func (o *options) StreamClientInterceptors() []grpc.StreamClientInterceptor {
 }
 
 func (o *options) parseTLSConfig() error {
-	if (o.tlsConfig != nil) {
+	if o.tlsConfig != nil {
 		return nil
 	}
 	if !o.hasTLSConfig() {
 		if !o.secure {
 			return nil
 		}
-		cert, err := certs.New(o.address, "localhost", "127.0.0.1", o.name)
+		var hosts []string
+		if host, _, err := net.SplitHostPort(o.address); err == nil {
+			if len(host) == 0 {
+				hosts = addr.IPs()
+			} else {
+				hosts = []string{host}
+			}
+		}
+		for i, h := range hosts {
+			a, err := addr.Extract(h)
+			if err != nil {
+				return err
+			}
+			hosts[i] = a
+		}
+		// generate a certificate
+		cert, err := certs.New(hosts...)
 		if err != nil {
 			return err
 		}
 		o.tlsConfig = &tls.Config{
-			Certificates:       []tls.Certificate{cert},
+			Certificates: []tls.Certificate{cert},
-			InsecureSkipVerify: true,
+			ClientAuth:   tls.NoClientCert,
 		}
 		return nil
 	}

service/service.go

@@ -4,15 +4,25 @@ import (
 	"context"
 	"net"
 	"os"
+	"strings"
 	"sync"
+	"time"
 
+	"github.com/google/uuid"
 	grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	"github.com/jinzhu/gorm"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"go.uber.org/multierr"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/reflection"
+
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry"
+	"gitlab.bertha.cloud/partitio/lab/grpc/registry/noop"
+	"gitlab.bertha.cloud/partitio/lab/grpc/utils/addr"
+	"gitlab.bertha.cloud/partitio/lab/grpc/utils/backoff"
+	net2 "gitlab.bertha.cloud/partitio/lab/grpc/utils/net"
 )
 
 type Service interface {
@@ -37,6 +47,10 @@ type service struct {
 	list    net.Listener
 	mu      sync.Mutex
 	running bool
+
+	id     string
+	regSvc *registry.Service
+	closed chan struct{}
 }
 
 func newService(opts ...Option) (*service, error) {
@@ -44,6 +58,7 @@ func newService(opts ...Option) (*service, error) {
 	s := &service{
 		opts: parseFlags(NewOptions()),
 		cmd:  cmd,
+		id:   uuid.New().String(),
 	}
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -62,6 +77,9 @@ func newService(opts ...Option) (*service, error) {
 			}
 		}
 	}()
+	if s.opts.registry == nil {
+		s.opts.registry = noop.New()
+	}
 	var err error
 	s.list, err = net.Listen("tcp", s.opts.address)
 	if err != nil {
@@ -78,13 +96,12 @@ func newService(opts ...Option) (*service, error) {
 		return s.run()
 	}
 	gopts := []grpc.ServerOption{
-		grpc.Creds(credentials.NewTLS(s.opts.tlsConfig)),
 		grpc.UnaryInterceptor(
 			grpcmiddleware.ChainUnaryServer(s.opts.serverInterceptors...),
 		),
 	}
 	if s.opts.tlsConfig != nil {
-		gopts = append(gopts)
+		gopts = append(gopts, grpc.Creds(credentials.NewTLS(s.opts.tlsConfig)))
 	}
 	s.server = grpc.NewServer(append(gopts, s.opts.serverOpts...)...)
 	if s.opts.reflection {
@@ -109,15 +126,95 @@ func (s *service) Cmd() *cobra.Command {
 	return s.cmd
 }
 
+func (s *service) register() error {
+	const (
+		defaultRegisterInterval = time.Second * 30
+		defaultRegisterTTL      = time.Second * 90
+	)
+	regFunc := func(service *registry.Service) error {
+		var regErr error
+
+		for i := 0; i < 3; i++ {
+			// set the ttl
+			rOpts := []registry.RegisterOption{registry.RegisterTTL(defaultRegisterTTL)}
+			// attempt to register
+			if err := s.opts.Registry().Register(service, rOpts...); err != nil {
+				// set the error
+				regErr = err
+				// backoff then retry
+				time.Sleep(backoff.Do(i + 1))
+				continue
+			}
+			// success so nil error
+			regErr = nil
+			break
+		}
+
+		return regErr
+	}
+
+	var err error
+	var advt, host, port string
+
+	//// check the advertise address first
+	//// if it exists then use it, otherwise
+	//// use the address
+	//if len(config.Advertise) > 0 {
+	//	advt = config.Advertise
+	//} else {
+		advt = s.opts.address
+	//}
+
+	if cnt := strings.Count(advt, ":"); cnt >= 1 {
+		// ipv6 address in format [host]:port or ipv4 host:port
+		host, port, err = net.SplitHostPort(advt)
+		if err != nil {
+			return err
+		}
+	} else {
+		host = s.opts.address
+	}
+
+	addr, err := addr.Extract(host)
+	if err != nil {
+		return err
+	}
+
+	// register service
+	node := &registry.Node{
+		Id:      s.opts.name + "-" + s.id,
+		Address: net2.HostPort(addr, port),
+	}
+
+	s.regSvc = &registry.Service{
+		Name: s.opts.name,
+		Version:   s.opts.version,
+		Nodes: []*registry.Node{node},
+	}
+
+	// register the service
+	if err := regFunc(s.regSvc); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (s *service) run() error {
 	s.mu.Lock()
+	s.closed = make(chan struct{})
 	for i := range s.opts.beforeStart {
 		if err := s.opts.beforeStart[i](); err != nil {
+			s.mu.Unlock()
 			return err
 		}
 	}
-	s.running = true
 	s.opts.address = s.list.Addr().String()
+
+	if err := s.register(); err != nil {
+		return err
+	}
+	s.running = true
 	errs := make(chan error)
 	go func() {
 		errs <- s.server.Serve(s.list)
@@ -130,7 +227,11 @@ func (s *service) run() error {
 		}
 	}
 	s.mu.Unlock()
-	return <-errs
+	if err :=  <-errs; err != nil{
+		logrus.Error(err)
+		return err
+	}
+	return nil
 }
 
 func (s *service) Start() error {
@@ -138,11 +239,15 @@ func (s *service) Start() error {
 }
 
 func (s *service) Stop() error {
+	defer close(s.closed)
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if !s.running {
 		return nil
 	}
+	if err := s.opts.registry.Deregister(s.regSvc); err != nil {
+		logrus.Errorf("failed to deregister service: %v", err)
+	}
 	for i := range s.opts.beforeStop {
 		if err := s.opts.beforeStop[i](); err != nil {
 			return err
@@ -153,9 +258,10 @@ func (s *service) Stop() error {
 	s.running = false
 	for i := range s.opts.afterStop {
 		if err := s.opts.afterStop[i](); err != nil {
-
+			return err
 		}
 	}
+	logrus.Info("server stopped")
 	return nil
 }
 
@@ -164,5 +270,6 @@ func (s *service) Close() error {
 	if s.opts.db != nil {
 		err = multierr.Append(s.opts.db.Close(), err)
 	}
+	<-s.closed
 	return err
 }

utils/addr/addr.go

@@ -0,0 +1,167 @@
+package addr
+
+import (
+	"fmt"
+	"net"
+)
+
+var (
+	privateBlocks []*net.IPNet
+)
+
+func init() {
+	for _, b := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "100.64.0.0/10", "fd00::/8"} {
+		if _, block, err := net.ParseCIDR(b); err == nil {
+			privateBlocks = append(privateBlocks, block)
+		}
+	}
+}
+
+func isPrivateIP(ipAddr string) bool {
+	ip := net.ParseIP(ipAddr)
+	for _, priv := range privateBlocks {
+		if priv.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsLocal tells us whether an ip is local
+func IsLocal(addr string) bool {
+	// extract the host
+	host, _, err := net.SplitHostPort(addr)
+	if err == nil {
+		addr = host
+	}
+
+	// check if its localhost
+	if addr == "localhost" {
+		return true
+	}
+
+	// check against all local ips
+	for _, ip := range IPs() {
+		if addr == ip {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Extract returns a real ip
+func Extract(addr string) (string, error) {
+	// if addr specified then its returned
+	if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
+		return addr, nil
+	}
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return "", fmt.Errorf("Failed to get interfaces! Err: %v", err)
+	}
+
+	//nolint:prealloc
+	var addrs []net.Addr
+	var loAddrs []net.Addr
+	for _, iface := range ifaces {
+		ifaceAddrs, err := iface.Addrs()
+		if err != nil {
+			// ignore error, interface can disappear from system
+			continue
+		}
+		if iface.Flags&net.FlagLoopback != 0 {
+			loAddrs = append(loAddrs, ifaceAddrs...)
+			continue
+		}
+		addrs = append(addrs, ifaceAddrs...)
+	}
+	addrs = append(addrs, loAddrs...)
+
+	var ipAddr string
+	var publicIP string
+
+	for _, rawAddr := range addrs {
+		var ip net.IP
+		switch addr := rawAddr.(type) {
+		case *net.IPAddr:
+			ip = addr.IP
+		case *net.IPNet:
+			ip = addr.IP
+		default:
+			continue
+		}
+
+		if !isPrivateIP(ip.String()) {
+			publicIP = ip.String()
+			continue
+		}
+
+		ipAddr = ip.String()
+		break
+	}
+
+	// return private ip
+	if len(ipAddr) > 0 {
+		a := net.ParseIP(ipAddr)
+		if a == nil {
+			return "", fmt.Errorf("ip addr %s is invalid", ipAddr)
+		}
+		return a.String(), nil
+	}
+
+	// return public or virtual ip
+	if len(publicIP) > 0 {
+		a := net.ParseIP(publicIP)
+		if a == nil {
+			return "", fmt.Errorf("ip addr %s is invalid", publicIP)
+		}
+		return a.String(), nil
+	}
+
+	return "", fmt.Errorf("No IP address found, and explicit IP not provided")
+}
+
+// IPs returns all known ips
+func IPs() []string {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil
+	}
+
+	var ipAddrs []string
+
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			continue
+		}
+
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+
+			if ip == nil {
+				continue
+			}
+
+			// dont skip ipv6 addrs
+			/*
+				ip = ip.To4()
+				if ip == nil {
+					continue
+				}
+			*/
+
+			ipAddrs = append(ipAddrs, ip.String())
+		}
+	}
+
+	return ipAddrs
+}

utils/addr/addr_test.go

@@ -0,0 +1,58 @@
+package addr
+
+import (
+	"net"
+	"testing"
+)
+
+func TestIsLocal(t *testing.T) {
+	testData := []struct {
+		addr   string
+		expect bool
+	}{
+		{"localhost", true},
+		{"localhost:8080", true},
+		{"127.0.0.1", true},
+		{"127.0.0.1:1001", true},
+		{"80.1.1.1", false},
+	}
+
+	for _, d := range testData {
+		res := IsLocal(d.addr)
+		if res != d.expect {
+			t.Fatalf("expected %t got %t", d.expect, res)
+		}
+	}
+}
+
+func TestExtractor(t *testing.T) {
+	testData := []struct {
+		addr   string
+		expect string
+		parse  bool
+	}{
+		{"127.0.0.1", "127.0.0.1", false},
+		{"10.0.0.1", "10.0.0.1", false},
+		{"", "", true},
+		{"0.0.0.0", "", true},
+		{"[::]", "", true},
+	}
+
+	for _, d := range testData {
+		addr, err := Extract(d.addr)
+		if err != nil {
+			t.Errorf("Unexpected error %v", err)
+		}
+
+		if d.parse {
+			ip := net.ParseIP(addr)
+			if ip == nil {
+				t.Error("Unexpected nil IP")
+			}
+
+		} else if addr != d.expect {
+			t.Errorf("Expected %s got %s", d.expect, addr)
+		}
+	}
+
+}

utils/backoff/backoff.go

@@ -0,0 +1,16 @@
+// Package backoff provides backoff functionality
+package backoff
+
+import (
+	"math"
+	"time"
+)
+
+// Do is a function x^e multiplied by a factor of 0.1 second.
+// Result is limited to 2 minute.
+func Do(attempts int) time.Duration {
+	if attempts > 13 {
+		return 2 * time.Minute
+	}
+	return time.Duration(math.Pow(float64(attempts), math.E)) * time.Millisecond * 100
+}

utils/net/net.go

@@ -0,0 +1,120 @@
+package net
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// HostPort format addr and port suitable for dial
+func HostPort(addr string, port interface{}) string {
+	host := addr
+	if strings.Count(addr, ":") > 0 {
+		host = fmt.Sprintf("[%s]", addr)
+	}
+	// when port is blank or 0, host is a queue name
+	if v, ok := port.(string); ok && v == "" {
+		return host
+	} else if v, ok := port.(int); ok && v == 0 && net.ParseIP(host) == nil {
+		return host
+	}
+
+	return fmt.Sprintf("%s:%v", host, port)
+}
+
+// Listen takes addr:portmin-portmax and binds to the first available port
+// Example: Listen("localhost:5000-6000", fn)
+func Listen(addr string, fn func(string) (net.Listener, error)) (net.Listener, error) {
+
+	if strings.Count(addr, ":") == 1 && strings.Count(addr, "-") == 0 {
+		return fn(addr)
+	}
+
+	// host:port || host:min-max
+	host, ports, err := net.SplitHostPort(addr)
+	if err != nil {
+		return nil, err
+	}
+
+	// try to extract port range
+	prange := strings.Split(ports, "-")
+
+	// single port
+	if len(prange) < 2 {
+		return fn(addr)
+	}
+
+	// we have a port range
+
+	// extract min port
+	min, err := strconv.Atoi(prange[0])
+	if err != nil {
+		return nil, errors.New("unable to extract port range")
+	}
+
+	// extract max port
+	max, err := strconv.Atoi(prange[1])
+	if err != nil {
+		return nil, errors.New("unable to extract port range")
+	}
+
+	// range the ports
+	for port := min; port <= max; port++ {
+		// try bind to host:port
+		ln, err := fn(HostPort(host, port))
+		if err == nil {
+			return ln, nil
+		}
+
+		// hit max port
+		if port == max {
+			return nil, err
+		}
+	}
+
+	// why are we here?
+	return nil, fmt.Errorf("unable to bind to %s", addr)
+}
+
+// Proxy returns the proxy and the address if it exits
+func Proxy(service string, address []string) (string, []string, bool) {
+	var hasProxy bool
+
+	// get proxy. we parse out address if present
+	if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
+		// default name
+		if prx == "service" {
+			prx = "go.micro.proxy"
+			address = nil
+		}
+
+		// check if its an address
+		if v := strings.Split(prx, ":"); len(v) > 1 {
+			address = []string{prx}
+		}
+
+		service = prx
+		hasProxy = true
+
+		return service, address, hasProxy
+	}
+
+	if prx := os.Getenv("MICRO_NETWORK"); len(prx) > 0 {
+		// default name
+		if prx == "service" {
+			prx = "go.micro.network"
+		}
+		service = prx
+		hasProxy = true
+	}
+
+	if prx := os.Getenv("MICRO_NETWORK_ADDRESS"); len(prx) > 0 {
+		address = []string{prx}
+		hasProxy = true
+	}
+
+	return service, address, hasProxy
+}

utils/net/net_test.go

@@ -0,0 +1,62 @@
+package net
+
+import (
+	"net"
+	"os"
+	"testing"
+)
+
+func TestListen(t *testing.T) {
+	fn := func(addr string) (net.Listener, error) {
+		return net.Listen("tcp", addr)
+	}
+
+	// try to create a number of listeners
+	for i := 0; i < 10; i++ {
+		l, err := Listen("localhost:10000-11000", fn)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer l.Close()
+	}
+
+	// TODO nats case test
+	// natsAddr := "_INBOX.bID2CMRvlNp0vt4tgNBHWf"
+	// Expect addr DO NOT has extra ":" at the end!
+
+}
+
+// TestProxyEnv checks whether we have proxy/network settings in env
+func TestProxyEnv(t *testing.T) {
+	service := "foo"
+	address := []string{"bar"}
+
+	s, a, ok := Proxy(service, address)
+	if ok {
+		t.Fatal("Should not have proxy", s, a, ok)
+	}
+
+	test := func(key, val, expectSrv, expectAddr string) {
+		// set env
+		os.Setenv(key, val)
+
+		s, a, ok := Proxy(service, address)
+		if !ok {
+			t.Fatal("Expected proxy")
+		}
+		if len(expectSrv) > 0 && s != expectSrv {
+			t.Fatal("Expected proxy service", expectSrv, "got", s)
+		}
+		if len(expectAddr) > 0 {
+			if len(a) == 0 || a[0] != expectAddr {
+				t.Fatal("Expected proxy address", expectAddr, "got", a)
+			}
+		}
+
+		os.Unsetenv(key)
+	}
+
+	test("MICRO_PROXY", "service", "go.micro.proxy", "")
+	test("MICRO_NETWORK", "service", "go.micro.network", "")
+	test("MICRO_NETWORK_ADDRESS", "10.0.0.1:8081", "", "10.0.0.1:8081")
+}