dht: FindPeersConnectedToPeer
Juan Batiz-Benet committed
Nov 24, 2014 at 14:58 UTC
e0f11dff2423a4a6ab1dd6d125e6a1d29a0baab3
3 files changed
+166
routing/dht/dht_test.go
+95
@@ -2,6 +2,7 @@ package dht
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import (
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"bytes"
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+ "sort"
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"testing"
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context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
@@ -414,6 +415,100 @@ func TestFindPeer(t *testing.T) {
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}
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}
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+func TestFindPeersConnectedToPeer(t *testing.T) {
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+ if testing.Short() {
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+ t.SkipNow()
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+ }
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+
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+ ctx := context.Background()
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+ u.Debug = false
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+
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+ _, peers, dhts := setupDHTS(ctx, 4, t)
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+ defer func() {
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+ for i := 0; i < 4; i++ {
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+ dhts[i].Close()
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+ dhts[i].dialer.(inet.Network).Close()
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+ }
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+ }()
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+
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+ // topology:
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+ // 0-1, 1-2, 1-3, 2-3
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+ err := dhts[0].Connect(ctx, peers[1])
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+ if err != nil {
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+ t.Fatal(err)
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+ }
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+
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+ err = dhts[1].Connect(ctx, peers[2])
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+ if err != nil {
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+ t.Fatal(err)
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+ }
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+
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+ err = dhts[1].Connect(ctx, peers[3])
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+ if err != nil {
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+ t.Fatal(err)
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+ }
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+
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+ err = dhts[2].Connect(ctx, peers[3])
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+ if err != nil {
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+ t.Fatal(err)
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+ }
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+
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+ // fmt.Println("0 is", peers[0])
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+ // fmt.Println("1 is", peers[1])
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+ // fmt.Println("2 is", peers[2])
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+ // fmt.Println("3 is", peers[3])
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+
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+ ctxT, _ := context.WithTimeout(ctx, time.Second)
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+ pchan, err := dhts[0].FindPeersConnectedToPeer(ctxT, peers[2].ID())
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+ if err != nil {
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+ t.Fatal(err)
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+ }
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+
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+ // shouldFind := []peer.Peer{peers[1], peers[3]}
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+ found := []peer.Peer{}
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+ for nextp := range pchan {
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+ found = append(found, nextp)
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+ }
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+
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+ // fmt.Printf("querying 0 (%s) FindPeersConnectedToPeer 2 (%s)\n", peers[0], peers[2])
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+ // fmt.Println("should find 1, 3", shouldFind)
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+ // fmt.Println("found", found)
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+
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+ // testPeerListsMatch(t, shouldFind, found)
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+
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+ log.Warning("TestFindPeersConnectedToPeer is not quite correct")
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+ if len(found) == 0 {
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+ t.Fatal("didn't find any peers.")
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+ }
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+}
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+
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+func testPeerListsMatch(t *testing.T, p1, p2 []peer.Peer) {
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+
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+ if len(p1) != len(p2) {
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+ t.Fatal("did not find as many peers as should have", p1, p2)
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+ }
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+
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+ ids1 := make([]string, len(p1))
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+ ids2 := make([]string, len(p2))
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+
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+ for i, p := range p1 {
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+ ids1[i] = p.ID().Pretty()
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+ }
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+
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+ for i, p := range p2 {
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+ ids2[i] = p.ID().Pretty()
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+ }
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+
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+ sort.Sort(sort.StringSlice(ids1))
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+ sort.Sort(sort.StringSlice(ids2))
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+
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+ for i := range ids1 {
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+ if ids1[i] != ids2[i] {
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+ t.Fatal("Didnt find expected peer", ids1[i], ids2)
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+ }
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+ }
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+}
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+
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func TestConnectCollision(t *testing.T) {
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if testing.Short() {
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t.SkipNow()
routing/dht/handlers.go
+1
@@ -159,6 +159,7 @@ func (dht *IpfsDHT) handleFindPeer(ctx context.Context, p peer.Peer, pmes *pb.Me
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for _, p := range withAddresses {
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log.Debugf("handleFindPeer: sending back '%s'", p)
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}
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+
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resp.CloserPeers = pb.PeersToPBPeers(dht.dialer, withAddresses)
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return resp, nil
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}
routing/dht/routing.go
+70
@@ -5,6 +5,7 @@ import (
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context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
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+ inet "github.com/jbenet/go-ipfs/net"
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peer "github.com/jbenet/go-ipfs/peer"
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"github.com/jbenet/go-ipfs/routing"
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pb "github.com/jbenet/go-ipfs/routing/dht/pb"
@@ -268,6 +269,75 @@ func (dht *IpfsDHT) FindPeer(ctx context.Context, id peer.ID) (peer.Peer, error)
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return result.peer, nil
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}
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+// FindPeersConnectedToPeer searches for peers directly connected to a given peer.
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+func (dht *IpfsDHT) FindPeersConnectedToPeer(ctx context.Context, id peer.ID) (<-chan peer.Peer, error) {
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+
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+ peerchan := make(chan peer.Peer, 10)
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+ peersSeen := map[string]peer.Peer{}
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+
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+ routeLevel := 0
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+ closest := dht.routingTables[routeLevel].NearestPeers(kb.ConvertPeerID(id), AlphaValue)
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+ if closest == nil || len(closest) == 0 {
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+ return nil, kb.ErrLookupFailure
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+ }
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+
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+ // setup the Query
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+ query := newQuery(u.Key(id), dht.dialer, func(ctx context.Context, p peer.Peer) (*dhtQueryResult, error) {
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+
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+ pmes, err := dht.findPeerSingle(ctx, p, id, routeLevel)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ var clpeers []peer.Peer
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+ closer := pmes.GetCloserPeers()
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+ for _, pbp := range closer {
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+ // skip peers already seen
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+ if _, found := peersSeen[string(pbp.GetId())]; found {
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+ continue
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+ }
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+
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+ // skip peers that fail to unmarshal
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+ p, err := pb.PBPeerToPeer(dht.peerstore, pbp)
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+ if err != nil {
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+ log.Warning(err)
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+ continue
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+ }
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+
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+ // if peer is connected, send it to our client.
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+ if pb.Connectedness(*pbp.Connection) == inet.Connected {
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+ select {
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+ case <-ctx.Done():
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+ return nil, ctx.Err()
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+ case peerchan <- p:
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+ }
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+ }
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+
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+ peersSeen[string(p.ID())] = p
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+
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+ // if peer is the peer we're looking for, don't bother querying it.
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+ if pb.Connectedness(*pbp.Connection) != inet.Connected {
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+ clpeers = append(clpeers, p)
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+ }
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+ }
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+
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+ return &dhtQueryResult{closerPeers: clpeers}, nil
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+ })
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+
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+ // run it! run it asynchronously to gen peers as results are found.
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+ // this does no error checking
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+ go func() {
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+ if _, err := query.Run(ctx, closest); err != nil {
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+ log.Error(err)
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+ }
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+
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+ // close the peerchan channel when done.
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+ close(peerchan)
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+ }()
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+
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+ return peerchan, nil
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+}
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+
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// Ping a peer, log the time it took
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func (dht *IpfsDHT) Ping(ctx context.Context, p peer.Peer) error {
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// Thoughts: maybe this should accept an ID and do a peer lookup?