feat(bs:net) impl service wrapper

bitswap/bitswap.go

@@ -1,12 +1,14 @@
 package bitswap
 
 import (
+	"errors"
 	"time"
 
 	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
 	ds "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/datastore.go"
 
 	bsmsg "github.com/jbenet/go-ipfs/bitswap/message"
+	bsnet "github.com/jbenet/go-ipfs/bitswap/network"
 	notifications "github.com/jbenet/go-ipfs/bitswap/notifications"
 	blocks "github.com/jbenet/go-ipfs/blocks"
 	swarm "github.com/jbenet/go-ipfs/net/swarm"
@@ -31,6 +33,7 @@ type BitSwap struct {
 	peer *peer.Peer
 
 	// net holds the connections to all peers.
+	sender  bsnet.Sender
 	net     swarm.Network
 	meschan *swarm.Chan
 
@@ -61,17 +64,22 @@ type BitSwap struct {
 
 // NewBitSwap creates a new BitSwap instance. It does not check its parameters.
 func NewBitSwap(p *peer.Peer, net swarm.Network, d ds.Datastore, r routing.IpfsRouting) *BitSwap {
+	receiver := receiver{}
+	sender := bsnet.NewBSNetService(context.Background(), &receiver)
 	bs := &BitSwap{
-		peer:          p,
-		net:           net,
-		datastore:     d,
-		partners:      LedgerMap{},
-		wantList:      KeySet{},
-		routing:       r.(*dht.IpfsDHT),
+		peer:      p,
+		net:       net,
+		datastore: d,
+		partners:  LedgerMap{},
+		wantList:  KeySet{},
+		routing:   r.(*dht.IpfsDHT),
+		// TODO(brian): replace |meschan| with |sender| in BitSwap impl
 		meschan:       net.GetChannel(swarm.PBWrapper_BITSWAP),
+		sender:        sender,
 		haltChan:      make(chan struct{}),
 		notifications: notifications.New(),
 	}
+	receiver.Delegate(bs)
 
 	go bs.handleMessages()
 	return bs
@@ -274,3 +282,9 @@ func (bs *BitSwap) SetStrategy(sf StrategyFunc) {
 		ledger.Strategy = sf
 	}
 }
+
+func (r *BitSwap) ReceiveMessage(
+	ctx context.Context, incoming bsmsg.BitSwapMessage) (
+	bsmsg.BitSwapMessage, *peer.Peer, error) {
+	return nil, nil, errors.New("TODO implement")
+}

bitswap/message/Makefile

@@ -0,0 +1,8 @@
+# TODO(brian): add proto tasks
+all: message.pb.go
+
+message.pb.go: message.proto
+	protoc --gogo_out=. --proto_path=../../../../../:/usr/local/opt/protobuf/include:. $<
+
+clean:
+	rm message.pb.go

bitswap/message/message.go

@@ -1,7 +1,10 @@
 package message
 
 import (
+	"errors"
+
 	proto "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/goprotobuf/proto"
+	netmsg "github.com/jbenet/go-ipfs/net/message"
 
 	blocks "github.com/jbenet/go-ipfs/blocks"
 	nm "github.com/jbenet/go-ipfs/net/message"
@@ -55,6 +58,10 @@ func (m *message) AppendBlock(b *blocks.Block) {
 	m.pb.Blocks = append(m.pb.Blocks, b.Data)
 }
 
+func FromNet(nmsg netmsg.NetMessage) (BitSwapMessage, error) {
+	return nil, errors.New("TODO implement")
+}
+
 func FromSwarm(sms swarm.Message) (BitSwapMessage, error) {
 	var protoMsg PBMessage
 	err := proto.Unmarshal(sms.Data, &protoMsg)

bitswap/network/interface.go

@@ -0,0 +1,20 @@
+package network
+
+import (
+	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
+
+	bsmsg "github.com/jbenet/go-ipfs/bitswap/message"
+	peer "github.com/jbenet/go-ipfs/peer"
+)
+
+type Sender interface {
+	SendMessage(ctx context.Context, destination *peer.Peer, message bsmsg.Exportable) error
+	SendRequest(ctx context.Context, destination *peer.Peer, outgoing bsmsg.Exportable) (
+		incoming bsmsg.BitSwapMessage, err error)
+}
+
+// TODO(brian): consider returning a NetMessage
+type Receiver interface {
+	ReceiveMessage(ctx context.Context, incoming bsmsg.BitSwapMessage) (
+		outgoing bsmsg.BitSwapMessage, destination *peer.Peer, err error)
+}

bitswap/network/service_wrapper.go

@@ -0,0 +1,76 @@
+package network
+
+import (
+	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
+
+	bsmsg "github.com/jbenet/go-ipfs/bitswap/message"
+	netmsg "github.com/jbenet/go-ipfs/net/message"
+	netservice "github.com/jbenet/go-ipfs/net/service"
+	peer "github.com/jbenet/go-ipfs/peer"
+)
+
+func NewBSNetService(ctx context.Context, r Receiver) Sender {
+	h := &handlerWrapper{r}
+	s := netservice.NewService(ctx, h)
+	return &serviceWrapper{*s}
+}
+
+// handlerWrapper is responsible for marshaling/unmarshaling NetMessages. It
+// delegates calls to the BitSwap delegate.
+type handlerWrapper struct {
+	bitswapDelegate Receiver
+}
+
+// HandleMessage marshals and unmarshals net messages, forwarding them to the
+// BitSwapMessage receiver
+func (wrapper *handlerWrapper) HandleMessage(
+	ctx context.Context, incoming netmsg.NetMessage) (netmsg.NetMessage, error) {
+
+	received, err := bsmsg.FromNet(incoming)
+	if err != nil {
+		return nil, err
+	}
+
+	bsmsg, p, err := wrapper.bitswapDelegate.ReceiveMessage(ctx, received)
+	if err != nil {
+		return nil, err
+	}
+	if bsmsg == nil {
+		return nil, nil
+	}
+
+	outgoing, err := bsmsg.ToNet(p)
+	if err != nil {
+		return nil, err
+	}
+
+	return outgoing, nil
+}
+
+type serviceWrapper struct {
+	serviceDelegate netservice.Service
+}
+
+func (wrapper *serviceWrapper) SendMessage(
+	ctx context.Context, p *peer.Peer, outgoing bsmsg.Exportable) error {
+	nmsg, err := outgoing.ToNet(p)
+	if err != nil {
+		return err
+	}
+	req, err := netservice.NewRequest(p.ID)
+	return wrapper.serviceDelegate.SendMessage(ctx, nmsg, req.ID)
+}
+
+func (wrapper *serviceWrapper) SendRequest(ctx context.Context,
+	p *peer.Peer, outgoing bsmsg.Exportable) (bsmsg.BitSwapMessage, error) {
+
+	outgoingMsg, err := outgoing.ToNet(p)
+	if err != nil {
+		return nil, err
+	}
+	incomingMsg, err := wrapper.serviceDelegate.SendRequest(ctx, outgoingMsg)
+	if err != nil {
+		return nil, err
+	}
+	return bsmsg.FromNet(incomingMsg)
+}

bitswap/receiver.go

@@ -0,0 +1,29 @@
+package bitswap
+
+import (
+	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
+	bsmsg "github.com/jbenet/go-ipfs/bitswap/message"
+	bsnet "github.com/jbenet/go-ipfs/bitswap/network"
+	peer "github.com/jbenet/go-ipfs/peer"
+)
+
+// receiver breaks the circular dependency between bitswap and its sender
+// NB: A sender is instantiated with a handler and this sender is then passed
+// as a constructor argument to BitSwap. However, the handler is BitSwap!
+// Hence, this receiver.
+type receiver struct {
+	delegate bsnet.Receiver
+}
+
+func (r *receiver) ReceiveMessage(
+	ctx context.Context, incoming bsmsg.BitSwapMessage) (
+	bsmsg.BitSwapMessage, *peer.Peer, error) {
+	if r.delegate == nil {
+		return nil, nil, nil
+	}
+	return r.delegate.ReceiveMessage(ctx, incoming)
+}
+
+func (r *receiver) Delegate(delegate bsnet.Receiver) {
+	r.delegate = delegate
+}

bitswap/receiver_test.go

@@ -0,0 +1,13 @@
+package bitswap
+
+import (
+	"testing"
+
+	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
+	bsmsg "github.com/jbenet/go-ipfs/bitswap/message"
+)
+
+func TestDoesntPanicIfDelegateNotPresent(t *testing.T) {
+	r := receiver{}
+	r.ReceiveMessage(context.Background(), bsmsg.New())
+}