add files i forgot to last night

routing/dht/mes_listener.go

@@ -0,0 +1,116 @@
+package dht
+
+import (
+	"sync"
+	"time"
+
+	swarm "github.com/jbenet/go-ipfs/swarm"
+	u "github.com/jbenet/go-ipfs/util"
+)
+
+type MesListener struct {
+	listeners map[uint64]*listenInfo
+	haltchan  chan struct{}
+	unlist    chan uint64
+	nlist     chan *listenInfo
+	send      chan *respMes
+}
+
+// The listen info struct holds information about a message that is being waited for
+type listenInfo struct {
+	// Responses matching the listen ID will be sent through resp
+	resp chan *swarm.Message
+
+	// count is the number of responses to listen for
+	count int
+
+	// eol is the time at which this listener will expire
+	eol time.Time
+
+	// sendlock is used to prevent conditions where we try to send on the resp
+	// channel as its being closed by a timeout in another thread
+	sendLock sync.Mutex
+
+	closed bool
+
+	id uint64
+}
+
+func NewMesListener() *MesListener {
+	ml := new(MesListener)
+	ml.haltchan = make(chan struct{})
+	ml.listeners = make(map[uint64]*listenInfo)
+	ml.nlist = make(chan *listenInfo, 16)
+	ml.send = make(chan *respMes, 16)
+	ml.unlist = make(chan uint64, 16)
+	go ml.run()
+	return ml
+}
+
+func (ml *MesListener) Listen(id uint64, count int, timeout time.Duration) <-chan *swarm.Message {
+	li := new(listenInfo)
+	li.count = count
+	li.eol = time.Now().Add(timeout)
+	li.resp = make(chan *swarm.Message, count)
+	li.id = id
+	ml.nlist <- li
+	return li.resp
+}
+
+func (ml *MesListener) Unlisten(id uint64) {
+	ml.unlist <- id
+}
+
+type respMes struct {
+	id  uint64
+	mes *swarm.Message
+}
+
+func (ml *MesListener) Respond(id uint64, mes *swarm.Message) {
+	ml.send <- &respMes{
+		id:  id,
+		mes: mes,
+	}
+}
+
+func (ml *MesListener) Halt() {
+	ml.haltchan <- struct{}{}
+}
+
+func (ml *MesListener) run() {
+	for {
+		select {
+		case <-ml.haltchan:
+			return
+		case id := <-ml.unlist:
+			trg, ok := ml.listeners[id]
+			if !ok {
+				continue
+			}
+			close(trg.resp)
+			delete(ml.listeners, id)
+		case li := <-ml.nlist:
+			ml.listeners[li.id] = li
+		case s := <-ml.send:
+			trg, ok := ml.listeners[s.id]
+			if !ok {
+				u.DOut("Send with no listener.")
+				continue
+			}
+
+			if time.Now().After(trg.eol) {
+				close(trg.resp)
+				delete(ml.listeners, s.id)
+				continue
+			}
+
+			trg.resp <- s.mes
+			trg.count--
+
+			if trg.count == 0 {
+				close(trg.resp)
+				delete(ml.listeners, s.id)
+			}
+		}
+	}
+}

routing/dht/routing.go

@@ -21,6 +21,12 @@ import (
 // Pool size is the number of nodes used for group find/set RPC calls
 var PoolSize = 6
 
+// We put the 'K' in kademlia!
+var KValue = 10
+
+// Its in the paper, i swear
+var AlphaValue = 3
+
 // TODO: determine a way of creating and managing message IDs
 func GenerateMessageID() uint64 {
 	//return (uint64(rand.Uint32()) << 32) & uint64(rand.Uint32())
@@ -35,24 +41,25 @@ func GenerateMessageID() uint64 {
 // This is the top level "Store" operation of the DHT
 func (s *IpfsDHT) PutValue(key u.Key, value []byte) {
 	complete := make(chan struct{})
+	count := 0
 	for _, route := range s.routes {
-		p := route.NearestPeer(kb.ConvertKey(key))
-		if p == nil {
-			s.network.Error(kb.ErrLookupFailure)
-			go func() {
-				complete <- struct{}{}
-			}()
-			continue
-		}
-		go func() {
-			err := s.putValueToNetwork(p, string(key), value)
-			if err != nil {
-				s.network.Error(err)
+		peers := route.NearestPeers(kb.ConvertKey(key), KValue)
+		for _, p := range peers {
+			if p == nil {
+				s.network.Error(kb.ErrLookupFailure)
+				continue
 			}
-			complete <- struct{}{}
-		}()
+			count++
+			go func(sp *peer.Peer) {
+				err := s.putValueToNetwork(sp, string(key), value)
+				if err != nil {
+					s.network.Error(err)
+				}
+				complete <- struct{}{}
+			}(p)
+		}
 	}
-	for _, _ = range s.routes {
+	for i := 0; i < count; i++ {
 		<-complete
 	}
 }
@@ -150,15 +157,13 @@ func (s *IpfsDHT) GetValue(key u.Key, timeout time.Duration) ([]byte, error) {
 
 	c := counter{}
 
-	// This limit value is referred to as k in the kademlia paper
-	limit := 20
 	count := 0
 	go func() {
 		for {
 			select {
 			case p := <-npeer_chan:
 				count++
-				if count >= limit {
+				if count >= KValue {
 					break
 				}
 				c.Increment()
@@ -194,7 +199,7 @@ func (s *IpfsDHT) GetValue(key u.Key, timeout time.Duration) ([]byte, error) {
 
 				for _, np := range peers {
 					// TODO: filter out peers that arent closer
-					if !pset.Contains(np) && pset.Size() < limit {
+					if !pset.Contains(np) && pset.Size() < KValue {
 						pset.Add(np) //This is racey... make a single function to do operation
 						npeer_chan <- np
 					}
@@ -204,8 +209,7 @@ func (s *IpfsDHT) GetValue(key u.Key, timeout time.Duration) ([]byte, error) {
 		}
 	}
 
-	concurFactor := 3
-	for i := 0; i < concurFactor; i++ {
+	for i := 0; i < AlphaValue; i++ {
 		go process()
 	}