Merge pull request #25 from jbenet/dht

DHT PR

identify/identify.go

@@ -0,0 +1,20 @@
+// The identify package handles how peers identify with eachother upon
+// connection to the network
+package identify
+
+import (
+	peer "github.com/jbenet/go-ipfs/peer"
+	u "github.com/jbenet/go-ipfs/util"
+)
+
+// Perform initial communication with this peer to share node ID's and
+// initiate communication
+func Handshake(self, remote *peer.Peer, in, out chan []byte) error {
+	// TODO: make this more... secure.
+	out <- self.ID
+	resp := <-in
+	remote.ID = peer.ID(resp)
+	u.DOut("[%s] identify: Got node id: %s", self.ID.Pretty(), remote.ID.Pretty())
+
+	return nil
+}

identify/message.proto

@@ -0,0 +1,3 @@
+message Identify {
+	required bytes id = 1;
+}

peer/peer.go

@@ -1,6 +1,10 @@
 package peer
 
 import (
+	"sync"
+	"time"
+
+	b58 "github.com/jbenet/go-base58"
 	u "github.com/jbenet/go-ipfs/util"
 	ma "github.com/jbenet/go-multiaddr"
 	mh "github.com/jbenet/go-multihash"
@@ -12,8 +16,12 @@ import (
 type ID mh.Multihash
 
 // Utililty function for comparing two peer ID's
-func (id *ID) Equal(other *ID) bool {
-	return bytes.Equal(*id, *other)
+func (id ID) Equal(other ID) bool {
+	return bytes.Equal(id, other)
+}
+
+func (id ID) Pretty() string {
+	return b58.Encode(id)
 }
 
 // Map maps Key (string) : *Peer (slices are not comparable).
@@ -24,6 +32,9 @@ type Map map[u.Key]*Peer
 type Peer struct {
 	ID        ID
 	Addresses []*ma.Multiaddr
+
+	latency   time.Duration
+	latenLock sync.RWMutex
 }
 
 // Key returns the ID as a Key (string) for maps.
@@ -52,3 +63,18 @@ func (p *Peer) NetAddress(n string) *ma.Multiaddr {
 	}
 	return nil
 }
+
+func (p *Peer) GetLatency() (out time.Duration) {
+	p.latenLock.RLock()
+	out = p.latency
+	p.latenLock.RUnlock()
+	return
+}
+
+// TODO: Instead of just keeping a single number,
+//		 keep a running average over the last hour or so
+func (p *Peer) SetLatency(laten time.Duration) {
+	p.latenLock.Lock()
+	p.latency = laten
+	p.latenLock.Unlock()
+}

routing/dht/DHTMessage.go

@@ -0,0 +1,49 @@
+package dht
+
+import (
+	peer "github.com/jbenet/go-ipfs/peer"
+)
+
+// A helper struct to make working with protbuf types easier
+type DHTMessage struct {
+	Type     PBDHTMessage_MessageType
+	Key      string
+	Value    []byte
+	Response bool
+	Id       uint64
+	Success  bool
+	Peers    []*peer.Peer
+}
+
+func peerInfo(p *peer.Peer) *PBDHTMessage_PBPeer {
+	pbp := new(PBDHTMessage_PBPeer)
+	addr, err := p.Addresses[0].String()
+	if err != nil {
+		//Temp: what situations could cause this?
+		panic(err)
+	}
+	pbp.Addr = &addr
+	pid := string(p.ID)
+	pbp.Id = &pid
+	return pbp
+}
+
+// TODO: building the protobuf message this way is a little wasteful
+//		 Unused fields wont be omitted, find a better way to do this
+func (m *DHTMessage) ToProtobuf() *PBDHTMessage {
+	pmes := new(PBDHTMessage)
+	if m.Value != nil {
+		pmes.Value = m.Value
+	}
+
+	pmes.Type = &m.Type
+	pmes.Key = &m.Key
+	pmes.Response = &m.Response
+	pmes.Id = &m.Id
+	pmes.Success = &m.Success
+	for _, p := range m.Peers {
+		pmes.Peers = append(pmes.Peers, peerInfo(p))
+	}
+
+	return pmes
+}