Merge pull request #427 from cannium/track-more-observed-address-info

Track more info for observed addresses

p2p/host/basic/basic_host.go

@@ -5,8 +5,6 @@ import (
 	"io"
 	"time"
 
-	identify "github.com/libp2p/go-libp2p/p2p/protocol/identify"
-
 	logging "github.com/ipfs/go-log"
 	goprocess "github.com/jbenet/goprocess"
 	goprocessctx "github.com/jbenet/goprocess/context"
@@ -15,6 +13,7 @@ import (
 	peer "github.com/libp2p/go-libp2p-peer"
 	pstore "github.com/libp2p/go-libp2p-peerstore"
 	protocol "github.com/libp2p/go-libp2p-protocol"
+	identify "github.com/libp2p/go-libp2p/p2p/protocol/identify"
 	ma "github.com/multiformats/go-multiaddr"
 	madns "github.com/multiformats/go-multiaddr-dns"
 	msmux "github.com/multiformats/go-multistream"

p2p/protocol/identify/id.go

@@ -393,7 +393,8 @@ func (ids *IDService) consumeObservedAddress(observed []byte, c inet.Conn) {
 
 	// ok! we have the observed version of one of our ListenAddresses!
 	log.Debugf("added own observed listen addr: %s --> %s", c.LocalMultiaddr(), maddr)
-	ids.observedAddrs.Add(maddr, c.RemoteMultiaddr())
+	ids.observedAddrs.Add(maddr, c.LocalMultiaddr(), c.RemoteMultiaddr(),
+		c.Stat().Direction)
 }
 
 func addrInAddrs(a ma.Multiaddr, as []ma.Multiaddr) bool {

p2p/protocol/identify/obsaddr.go

@@ -4,29 +4,34 @@ import (
 	"sync"
 	"time"
 
+	net "github.com/libp2p/go-libp2p-net"
 	pstore "github.com/libp2p/go-libp2p-peerstore"
 	ma "github.com/multiformats/go-multiaddr"
 )
 
 const ActivationThresh = 4
 
+type observation struct {
+	seenTime      time.Time
+	connDirection net.Direction
+}
+
 // ObservedAddr is an entry for an address reported by our peers.
 // We only use addresses that:
 // - have been observed at least 4 times in last 1h. (counter symmetric nats)
 // - have been observed at least once recently (1h), because our position in the
 //   network, or network port mapppings, may have changed.
 type ObservedAddr struct {
-	Addr      ma.Multiaddr
-	SeenBy    map[string]time.Time
-	LastSeen  time.Time
-	Activated bool
+	Addr     ma.Multiaddr
+	SeenBy   map[string]observation // peer(observer) address -> observation info
+	LastSeen time.Time
 }
 
-func (oa *ObservedAddr) TryActivate(ttl time.Duration) bool {
+func (oa *ObservedAddr) activated(ttl time.Duration) bool {
 	// cleanup SeenBy set
 	now := time.Now()
-	for k, t := range oa.SeenBy {
-		if now.Sub(t) > ttl*ActivationThresh {
+	for k, ob := range oa.SeenBy {
+		if now.Sub(ob.seenTime) > ttl*ActivationThresh {
 			delete(oa.SeenBy, k)
 		}
 	}
@@ -41,60 +46,75 @@ func (oa *ObservedAddr) TryActivate(ttl time.Duration) bool {
 type ObservedAddrSet struct {
 	sync.Mutex // guards whole datastruct.
 
-	addrs map[string]*ObservedAddr
+	// local(internal) address -> list of observed(external) addresses
+	addrs map[string][]*ObservedAddr
 	ttl   time.Duration
 }
 
-func (oas *ObservedAddrSet) Addrs() []ma.Multiaddr {
+// Addrs return all activated observed addresses
+func (oas *ObservedAddrSet) Addrs() (addrs []ma.Multiaddr) {
 	oas.Lock()
 	defer oas.Unlock()
 
 	// for zero-value.
-	if oas.addrs == nil {
+	if len(oas.addrs) == 0 {
 		return nil
 	}
 
 	now := time.Now()
-	addrs := make([]ma.Multiaddr, 0, len(oas.addrs))
-	for s, a := range oas.addrs {
-		// remove timed out addresses.
-		if now.Sub(a.LastSeen) > oas.ttl {
-			delete(oas.addrs, s)
-			continue
-		}
-
-		if a.Activated || a.TryActivate(oas.ttl) {
-			addrs = append(addrs, a.Addr)
+	for local, observedAddrs := range oas.addrs {
+		filteredAddrs := make([]*ObservedAddr, 0, len(observedAddrs))
+		for _, a := range observedAddrs {
+			// leave only alive observed addresses
+			if now.Sub(a.LastSeen) <= oas.ttl {
+				filteredAddrs = append(filteredAddrs, a)
+				if a.activated(oas.ttl) {
+					addrs = append(addrs, a.Addr)
+				}
+			}
 		}
+		oas.addrs[local] = filteredAddrs
 	}
 	return addrs
 }
 
-func (oas *ObservedAddrSet) Add(addr ma.Multiaddr, observer ma.Multiaddr) {
+func (oas *ObservedAddrSet) Add(observed, local, observer ma.Multiaddr,
+	direction net.Direction) {
+
 	oas.Lock()
 	defer oas.Unlock()
 
 	// for zero-value.
 	if oas.addrs == nil {
-		oas.addrs = make(map[string]*ObservedAddr)
+		oas.addrs = make(map[string][]*ObservedAddr)
 		oas.ttl = pstore.OwnObservedAddrTTL
 	}
 
-	s := addr.String()
-	oa, found := oas.addrs[s]
+	now := time.Now()
+	observerString := observerGroup(observer)
+	localString := local.String()
+	ob := observation{
+		seenTime:      now,
+		connDirection: direction,
+	}
 
-	// first time seeing address.
-	if !found {
-		oa = &ObservedAddr{
-			Addr:   addr,
-			SeenBy: make(map[string]time.Time),
+	observedAddrs := oas.addrs[localString]
+	// check if observed address seen yet, if so, update it
+	for i, previousObserved := range observedAddrs {
+		if previousObserved.Addr.Equal(observed) {
+			observedAddrs[i].SeenBy[observerString] = ob
+			observedAddrs[i].LastSeen = now
+			return
 		}
-		oas.addrs[s] = oa
 	}
-
-	// mark the observer
-	oa.SeenBy[observerGroup(observer)] = time.Now()
-	oa.LastSeen = time.Now()
+	// observed address not seen yet, append it
+	oas.addrs[localString] = append(oas.addrs[localString], &ObservedAddr{
+		Addr: observed,
+		SeenBy: map[string]observation{
+			observerString: ob,
+		},
+		LastSeen: now,
+	})
 }
 
 // observerGroup is a function that determines what part of

p2p/protocol/identify/obsaddr_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 	"time"
 
+	net "github.com/libp2p/go-libp2p-net"
 	ma "github.com/multiformats/go-multiaddr"
 )
 
@@ -49,15 +50,22 @@ func TestObsAddrSet(t *testing.T) {
 	b4 := m("/ip4/1.2.3.9/tcp/1237")
 	b5 := m("/ip4/1.2.3.10/tcp/1237")
 
-	oas := ObservedAddrSet{}
+	oas := &ObservedAddrSet{}
 
 	if !addrsMarch(oas.Addrs(), nil) {
 		t.Error("addrs should be empty")
 	}
 
-	oas.Add(a1, a4)
-	oas.Add(a2, a4)
-	oas.Add(a3, a4)
+	add := func(oas *ObservedAddrSet, observed, observer ma.Multiaddr) {
+		dummyLocal := m("/ip4/127.0.0.1/tcp/10086")
+		dummyDirection := net.DirOutbound
+
+		oas.Add(observed, dummyLocal, observer, dummyDirection)
+	}
+
+	add(oas, a1, a4)
+	add(oas, a2, a4)
+	add(oas, a3, a4)
 
 	// these are all different so we should not yet get them.
 	if !addrsMarch(oas.Addrs(), nil) {
@@ -65,39 +73,39 @@ func TestObsAddrSet(t *testing.T) {
 	}
 
 	// same observer, so should not yet get them.
-	oas.Add(a1, a4)
-	oas.Add(a2, a4)
-	oas.Add(a3, a4)
+	add(oas, a1, a4)
+	add(oas, a2, a4)
+	add(oas, a3, a4)
 	if !addrsMarch(oas.Addrs(), nil) {
 		t.Error("addrs should _still_ be empty (same obs)")
 	}
 
 	// different observer, but same observer group.
-	oas.Add(a1, a5)
-	oas.Add(a2, a5)
-	oas.Add(a3, a5)
+	add(oas, a1, a5)
+	add(oas, a2, a5)
+	add(oas, a3, a5)
 	if !addrsMarch(oas.Addrs(), nil) {
 		t.Error("addrs should _still_ be empty (same obs group)")
 	}
 
-	oas.Add(a1, b1)
-	oas.Add(a1, b2)
-	oas.Add(a1, b3)
+	add(oas, a1, b1)
+	add(oas, a1, b2)
+	add(oas, a1, b3)
 	if !addrsMarch(oas.Addrs(), []ma.Multiaddr{a1}) {
 		t.Error("addrs should only have a1")
 	}
 
-	oas.Add(a2, a5)
-	oas.Add(a1, a5)
-	oas.Add(a1, a5)
-	oas.Add(a2, b1)
-	oas.Add(a1, b1)
-	oas.Add(a1, b1)
-	oas.Add(a2, b2)
-	oas.Add(a1, b2)
-	oas.Add(a1, b2)
-	oas.Add(a2, b4)
-	oas.Add(a2, b5)
+	add(oas, a2, a5)
+	add(oas, a1, a5)
+	add(oas, a1, a5)
+	add(oas, a2, b1)
+	add(oas, a1, b1)
+	add(oas, a1, b1)
+	add(oas, a2, b2)
+	add(oas, a1, b2)
+	add(oas, a1, b2)
+	add(oas, a2, b4)
+	add(oas, a2, b5)
 	if !addrsMarch(oas.Addrs(), []ma.Multiaddr{a1, a2}) {
 		t.Error("addrs should only have a1, a2")
 	}