implement the new mDNS spec, move the old mDNS implementation (#1161)

* move the current mdns discovery implementation to discovery_legacy * use libp2p/zeroconf for mDNS discovery * rename the discovery package to mdns * don't store the context * use a wait group for clean shutdown of the mdns resolver * add comment about port numbers * move the mdns packages p2p/discovery
libp2p · Aug 18, 2021 · ec3c9cb · ec3c9cb
1 parent 8b77428
commit ec3c9cb
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Showing 15 changed files with 375 additions and 46 deletions.
diff --git a/examples/chat-with-mdns/README.md b/examples/chat-with-mdns/README.md
@@ -60,7 +60,7 @@ func handleStream(stream net.Stream) {
 Start [mdns discovery](https://godoc.org/github.com/libp2p/go-libp2p/p2p/discovery#NewMdnsService) service in host.
 
 ```go
-ser, err := discovery.NewMdnsService(ctx, peerhost, time.Hour, rendezvous)
+ser, err := discovery.NewMdnsService(peerhost, rendezvous)
 ```
 register [Notifee interface](https://godoc.org/github.com/libp2p/go-libp2p/p2p/discovery#Notifee) with service so that we get notified about peer discovery
 
@@ -97,4 +97,4 @@ Finally we open stream to the peers we found, as we find them
 ```
 
 ## Authors
-1. Bineesh Lazar
+1. Bineesh Lazar
diff --git a/examples/chat-with-mdns/mdns.go b/examples/chat-with-mdns/mdns.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/libp2p/go-libp2p-core/host"
 	"github.com/libp2p/go-libp2p-core/peer"
-	"github.com/libp2p/go-libp2p/p2p/discovery"
+	mdns "github.com/libp2p/go-libp2p/p2p/discovery/mdns_legacy"
 )
 
 type discoveryNotifee struct {
@@ -21,7 +21,7 @@ func (n *discoveryNotifee) HandlePeerFound(pi peer.AddrInfo) {
 //Initialize the MDNS service
 func initMDNS(ctx context.Context, peerhost host.Host, rendezvous string) chan peer.AddrInfo {
 	// An hour might be a long long period in practical applications. But this is fine for us
-	ser, err := discovery.NewMdnsService(ctx, peerhost, time.Hour, rendezvous)
+	ser, err := mdns.NewMdnsService(ctx, peerhost, time.Hour, rendezvous)
 	if err != nil {
 		panic(err)
 	}

diff --git a/examples/go.sum b/examples/go.sum
@@ -94,7 +94,10 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/cenkalti/backoff/v4 v4.1.1 h1:G2HAfAmvm/GcKan2oOQpBXOd2tT2G57ZnZGWa1PxPBQ=
+github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
@@ -558,6 +561,8 @@ github.com/libp2p/go-yamux v1.4.1 h1:P1Fe9vF4th5JOxxgQvfbOHkrGqIZniTLf+ddhZp8YTI
 github.com/libp2p/go-yamux v1.4.1/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/hkmpooHE=
 github.com/libp2p/go-yamux/v2 v2.2.0 h1:RwtpYZ2/wVviZ5+3pjC8qdQ4TKnrak0/E01N1UWoAFU=
 github.com/libp2p/go-yamux/v2 v2.2.0/go.mod h1:3So6P6TV6r75R9jiBpiIKgU/66lOarCZjqROGxzPpPQ=
+github.com/libp2p/zeroconf/v2 v2.0.0 h1:qYAHAqUVh4hMSfu+iDTZNqH07wLGAvb1+DW4Tx/qUoQ=
+github.com/libp2p/zeroconf/v2 v2.0.0/go.mod h1:J85R/d9joD8u8F9aHM8pBXygtG9W02enEwS+wWeL6yo=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
 github.com/lucas-clemente/quic-go v0.21.2 h1:8LqqL7nBQFDUINadW0fHV/xSaCQJgmJC0Gv+qUnjd78=

diff --git a/examples/ipfs-camp-2019/06-Pubsub/main.go b/examples/ipfs-camp-2019/06-Pubsub/main.go
@@ -6,7 +6,6 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
-	"time"
 
 	"github.com/libp2p/go-libp2p"
 	"github.com/libp2p/go-libp2p-core/host"
@@ -18,8 +17,8 @@ import (
 	mplex "github.com/libp2p/go-libp2p-mplex"
 	tls "github.com/libp2p/go-libp2p-tls"
 	yamux "github.com/libp2p/go-libp2p-yamux"
-	"github.com/libp2p/go-libp2p/p2p/discovery"
-	tcp "github.com/libp2p/go-tcp-transport"
+	"github.com/libp2p/go-libp2p/p2p/discovery/mdns"
+	"github.com/libp2p/go-tcp-transport"
 	ws "github.com/libp2p/go-ws-transport"
 	"github.com/multiformats/go-multiaddr"
 )
@@ -102,10 +101,7 @@ func main() {
 		fmt.Println("Connected to", targetInfo.ID)
 	}
 
-	mdns, err := discovery.NewMdnsService(ctx, host, time.Second*10, "")
-	if err != nil {
-		panic(err)
-	}
+	mdns := mdns.NewMdnsService(host, "")
 	notifee := &discoveryNotifee{h: host, ctx: ctx}
 	mdns.RegisterNotifee(notifee)
 

diff --git a/examples/ipfs-camp-2019/07-Messaging/main.go b/examples/ipfs-camp-2019/07-Messaging/main.go
@@ -6,7 +6,6 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
-	"time"
 
 	"github.com/libp2p/go-libp2p"
 	"github.com/libp2p/go-libp2p-core/host"
@@ -17,7 +16,7 @@ import (
 	pubsub "github.com/libp2p/go-libp2p-pubsub"
 	tls "github.com/libp2p/go-libp2p-tls"
 	yamux "github.com/libp2p/go-libp2p-yamux"
-	"github.com/libp2p/go-libp2p/p2p/discovery"
+	"github.com/libp2p/go-libp2p/p2p/discovery/mdns"
 	"github.com/libp2p/go-tcp-transport"
 	ws "github.com/libp2p/go-ws-transport"
 	"github.com/multiformats/go-multiaddr"
@@ -110,10 +109,7 @@ func main() {
 
 	fmt.Println("Connected to", targetInfo.ID)
 
-	mdns, err := discovery.NewMdnsService(ctx, host, time.Second*10, "")
-	if err != nil {
-		panic(err)
-	}
+	mdns := mdns.NewMdnsService(host, "")
 	mdns.RegisterNotifee(&mdnsNotifee{h: host, ctx: ctx})
 
 	err = dht.Bootstrap(ctx)

diff --git a/examples/ipfs-camp-2019/08-End/main.go b/examples/ipfs-camp-2019/08-End/main.go
@@ -6,7 +6,6 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
-	"time"
 
 	"github.com/libp2p/go-libp2p"
 	"github.com/libp2p/go-libp2p-core/host"
@@ -17,7 +16,7 @@ import (
 	pubsub "github.com/libp2p/go-libp2p-pubsub"
 	tls "github.com/libp2p/go-libp2p-tls"
 	yamux "github.com/libp2p/go-libp2p-yamux"
-	"github.com/libp2p/go-libp2p/p2p/discovery"
+	"github.com/libp2p/go-libp2p/p2p/discovery/mdns"
 	"github.com/libp2p/go-tcp-transport"
 	ws "github.com/libp2p/go-ws-transport"
 	"github.com/multiformats/go-multiaddr"
@@ -109,10 +108,7 @@ func main() {
 
 	fmt.Println("Connected to", targetInfo.ID)
 
-	mdns, err := discovery.NewMdnsService(ctx, host, time.Second*10, "")
-	if err != nil {
-		panic(err)
-	}
+	mdns := mdns.NewMdnsService(host, "")
 	mdns.RegisterNotifee(&mdnsNotifee{h: host, ctx: ctx})
 
 	err = dht.Bootstrap(ctx)

diff --git a/examples/ipfs-camp-2019/go.sum b/examples/ipfs-camp-2019/go.sum
@@ -95,7 +95,10 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/cenkalti/backoff/v4 v4.1.1 h1:G2HAfAmvm/GcKan2oOQpBXOd2tT2G57ZnZGWa1PxPBQ=
+github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
@@ -561,6 +564,8 @@ github.com/libp2p/go-yamux v1.4.1 h1:P1Fe9vF4th5JOxxgQvfbOHkrGqIZniTLf+ddhZp8YTI
 github.com/libp2p/go-yamux v1.4.1/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/hkmpooHE=
 github.com/libp2p/go-yamux/v2 v2.2.0 h1:RwtpYZ2/wVviZ5+3pjC8qdQ4TKnrak0/E01N1UWoAFU=
 github.com/libp2p/go-yamux/v2 v2.2.0/go.mod h1:3So6P6TV6r75R9jiBpiIKgU/66lOarCZjqROGxzPpPQ=
+github.com/libp2p/zeroconf/v2 v2.0.0 h1:qYAHAqUVh4hMSfu+iDTZNqH07wLGAvb1+DW4Tx/qUoQ=
+github.com/libp2p/zeroconf/v2 v2.0.0/go.mod h1:J85R/d9joD8u8F9aHM8pBXygtG9W02enEwS+wWeL6yo=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
 github.com/lucas-clemente/quic-go v0.21.2 h1:8LqqL7nBQFDUINadW0fHV/xSaCQJgmJC0Gv+qUnjd78=
@@ -862,7 +867,6 @@ github.com/warpfork/go-wish v0.0.0-20200122115046-b9ea61034e4a/go.mod h1:x6AKhvS
 github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1 h1:EKhdznlJHPMoKr0XTrX+IlJs1LH3lyx2nfr1dOlZ79k=
 github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1/go.mod h1:8UvriyWtv5Q5EOgjHaSseUEdkQfvwFv1I/In/O2M9gc=
 github.com/whyrusleeping/go-logging v0.0.0-20170515211332-0457bb6b88fc/go.mod h1:bopw91TMyo8J3tvftk8xmU2kPmlrt4nScJQZU2hE5EM=
-github.com/whyrusleeping/mdns v0.0.0-20190826153040-b9b60ed33aa9 h1:Y1/FEOpaCpD21WxrmfeIYCFPuVPRCY2XZTWzTNHGw30=
 github.com/whyrusleeping/mdns v0.0.0-20190826153040-b9b60ed33aa9/go.mod h1:j4l84WPFclQPj320J9gp0XwNKBb3U0zt5CBqjPp22G4=
 github.com/whyrusleeping/multiaddr-filter v0.0.0-20160516205228-e903e4adabd7 h1:E9S12nwJwEOXe2d6gT6qxdvqMnNq+VnSsKPgm2ZZNds=
 github.com/whyrusleeping/multiaddr-filter v0.0.0-20160516205228-e903e4adabd7/go.mod h1:X2c0RVCI1eSUFI8eLcY3c0423ykwiUdxLJtkDvruhjI=

diff --git a/examples/pubsub/chat/go.sum b/examples/pubsub/chat/go.sum
@@ -94,7 +94,10 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/cenkalti/backoff/v4 v4.1.1 h1:G2HAfAmvm/GcKan2oOQpBXOd2tT2G57ZnZGWa1PxPBQ=
+github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
@@ -523,6 +526,8 @@ github.com/libp2p/go-yamux v1.4.1 h1:P1Fe9vF4th5JOxxgQvfbOHkrGqIZniTLf+ddhZp8YTI
 github.com/libp2p/go-yamux v1.4.1/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/hkmpooHE=
 github.com/libp2p/go-yamux/v2 v2.2.0 h1:RwtpYZ2/wVviZ5+3pjC8qdQ4TKnrak0/E01N1UWoAFU=
 github.com/libp2p/go-yamux/v2 v2.2.0/go.mod h1:3So6P6TV6r75R9jiBpiIKgU/66lOarCZjqROGxzPpPQ=
+github.com/libp2p/zeroconf/v2 v2.0.0 h1:qYAHAqUVh4hMSfu+iDTZNqH07wLGAvb1+DW4Tx/qUoQ=
+github.com/libp2p/zeroconf/v2 v2.0.0/go.mod h1:J85R/d9joD8u8F9aHM8pBXygtG9W02enEwS+wWeL6yo=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
 github.com/lucas-clemente/quic-go v0.21.2 h1:8LqqL7nBQFDUINadW0fHV/xSaCQJgmJC0Gv+qUnjd78=
@@ -821,7 +826,6 @@ github.com/viant/assertly v0.4.8/go.mod h1:aGifi++jvCrUaklKEKT0BU95igDNaqkvz+49u
 github.com/viant/toolbox v0.24.0/go.mod h1:OxMCG57V0PXuIP2HNQrtJf2CjqdmbrOx5EkMILuUhzM=
 github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1/go.mod h1:8UvriyWtv5Q5EOgjHaSseUEdkQfvwFv1I/In/O2M9gc=
 github.com/whyrusleeping/go-logging v0.0.0-20170515211332-0457bb6b88fc/go.mod h1:bopw91TMyo8J3tvftk8xmU2kPmlrt4nScJQZU2hE5EM=
-github.com/whyrusleeping/mdns v0.0.0-20190826153040-b9b60ed33aa9 h1:Y1/FEOpaCpD21WxrmfeIYCFPuVPRCY2XZTWzTNHGw30=
 github.com/whyrusleeping/mdns v0.0.0-20190826153040-b9b60ed33aa9/go.mod h1:j4l84WPFclQPj320J9gp0XwNKBb3U0zt5CBqjPp22G4=
 github.com/whyrusleeping/multiaddr-filter v0.0.0-20160516205228-e903e4adabd7 h1:E9S12nwJwEOXe2d6gT6qxdvqMnNq+VnSsKPgm2ZZNds=
 github.com/whyrusleeping/multiaddr-filter v0.0.0-20160516205228-e903e4adabd7/go.mod h1:X2c0RVCI1eSUFI8eLcY3c0423ykwiUdxLJtkDvruhjI=

diff --git a/examples/pubsub/chat/main.go b/examples/pubsub/chat/main.go
@@ -8,12 +8,10 @@ import (
 	"time"
 
 	"github.com/libp2p/go-libp2p"
-	"github.com/libp2p/go-libp2p-core/peer"
-	"github.com/libp2p/go-libp2p/p2p/discovery"
-
 	"github.com/libp2p/go-libp2p-core/host"
-
+	"github.com/libp2p/go-libp2p-core/peer"
 	pubsub "github.com/libp2p/go-libp2p-pubsub"
+	"github.com/libp2p/go-libp2p/p2p/discovery/mdns"
 )
 
 // DiscoveryInterval is how often we re-publish our mDNS records.
@@ -107,10 +105,7 @@ func (n *discoveryNotifee) HandlePeerFound(pi peer.AddrInfo) {
 // This lets us automatically discover peers on the same LAN and connect to them.
 func setupDiscovery(ctx context.Context, h host.Host) error {
 	// setup mDNS discovery to find local peers
-	disc, err := discovery.NewMdnsService(ctx, h, DiscoveryInterval, DiscoveryServiceTag)
-	if err != nil {
-		return err
-	}
+	disc := mdns.NewMdnsService(h, DiscoveryServiceTag)
 
 	n := discoveryNotifee{h: h}
 	disc.RegisterNotifee(&n)

diff --git a/go.mod b/go.mod
@@ -40,6 +40,7 @@ require (
 	github.com/libp2p/go-stream-muxer-multistream v0.3.0
 	github.com/libp2p/go-tcp-transport v0.2.7
 	github.com/libp2p/go-ws-transport v0.5.0
+	github.com/libp2p/zeroconf/v2 v2.0.0
 	github.com/miekg/dns v1.1.43 // indirect
 	github.com/multiformats/go-multiaddr v0.4.0
 	github.com/multiformats/go-multiaddr-dns v0.3.1

diff --git a/go.sum b/go.sum
@@ -95,7 +95,10 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
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@@ -598,6 +601,8 @@ github.com/libp2p/go-yamux v1.4.1 h1:P1Fe9vF4th5JOxxgQvfbOHkrGqIZniTLf+ddhZp8YTI
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+github.com/libp2p/zeroconf/v2 v2.0.0 h1:qYAHAqUVh4hMSfu+iDTZNqH07wLGAvb1+DW4Tx/qUoQ=
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 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
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