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service.go
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service.go
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package service
import (
"context"
"errors"
inet "gx/ipfs/QmVtMT3fD7DzQNW7hdm6Xe6KPstzcggrhNpeVZ4422UpKK/go-libp2p-net"
peer "gx/ipfs/QmWUswjn261LSyVxWAEpMVtPdy8zmKBJJfBpG3Qdpa8ZsE/go-libp2p-peer"
host "gx/ipfs/QmXzeAcmKDTfNZQBiyF22hQKuTK7P5z6MBBQLTk9bbiSUc/go-libp2p-host"
ggio "gx/ipfs/QmZ4Qi3GaRbjcx28Sme5eMH7RQjGkt8wHxt2a65oLaeFEV/gogo-protobuf/io"
protocol "gx/ipfs/QmZNkThpqfVXs9GNbexPrfBbXSLNYeKrE7jwFM2oqHbyqN/go-libp2p-protocol"
ps "gx/ipfs/Qme1g4e3m2SmdiSGGU3vSWmUStwUjc5oECnEriaK9Xa1HU/go-libp2p-peerstore"
"io"
"sync"
"time"
"github.com/OpenBazaar/openbazaar-go/core"
"github.com/OpenBazaar/openbazaar-go/pb"
"github.com/OpenBazaar/openbazaar-go/repo"
"github.com/ipfs/go-ipfs/commands"
ctxio "github.com/jbenet/go-context/io"
"github.com/op/go-logging"
)
var log = logging.MustGetLogger("service")
var ProtocolOpenBazaar protocol.ID = "/openbazaar/app/1.0.0"
type OpenBazaarService struct {
host host.Host
self peer.ID
peerstore ps.Peerstore
cmdCtx commands.Context
ctx context.Context
broadcast chan interface{}
datastore repo.Datastore
node *core.OpenBazaarNode
sender map[peer.ID]*messageSender
senderlk sync.Mutex
}
func New(node *core.OpenBazaarNode, ctx commands.Context, datastore repo.Datastore) *OpenBazaarService {
service := &OpenBazaarService{
host: node.IpfsNode.PeerHost.(host.Host),
self: node.IpfsNode.Identity,
peerstore: node.IpfsNode.PeerHost.Peerstore(),
cmdCtx: ctx,
ctx: node.IpfsNode.Context(),
broadcast: node.Broadcast,
datastore: datastore,
node: node,
sender: make(map[peer.ID]*messageSender),
}
node.IpfsNode.PeerHost.SetStreamHandler(ProtocolOpenBazaar, service.HandleNewStream)
log.Infof("OpenBazaar service running at %s", ProtocolOpenBazaar)
return service
}
func (service *OpenBazaarService) HandleNewStream(s inet.Stream) {
go service.handleNewMessage(s, true)
}
func (service *OpenBazaarService) handleNewMessage(s inet.Stream, incoming bool) {
cr := ctxio.NewReader(service.ctx, s)
r := ggio.NewDelimitedReader(cr, inet.MessageSizeMax)
mPeer := s.Conn().RemotePeer()
// Check if banned
if service.node.BanManager.IsBanned(mPeer) {
return
}
var ms *messageSender
if incoming {
// if this is an inbound stream
// ensure the message sender for this peer is updated with this stream, so we reply over it
ms = service.messageSenderForPeer(mPeer, &s)
} else {
ms = service.messageSenderForPeer(mPeer, nil)
}
defer s.Close()
for {
select {
// end loop on context close
case <-service.ctx.Done():
return
default:
}
// Receive msg
pmes := new(pb.Message)
if err := r.ReadMsg(pmes); err != nil {
if err == io.EOF {
// EOF error means the sender closed the stream
return
}
log.Errorf("Error unmarshaling data: %s", err)
continue
}
if pmes.IsResponse {
ms.requestlk.Lock()
ch, ok := ms.requests[pmes.RequestId]
if ok {
// this is a request response
select {
case ch <- pmes:
// message returned to requester
case <-time.After(time.Second):
// in case ch is closed on the other end - the lock should prevent this happening
log.Debug("request id was not removed from map on timeout")
}
close(ch)
delete(ms.requests, pmes.RequestId)
} else {
log.Debug("received response message with unknown request id: requesting function may have timed out")
}
ms.requestlk.Unlock()
continue
}
// Get handler for this msg type
handler := service.HandlerForMsgType(pmes.MessageType)
if handler == nil {
log.Debug("Got back nil handler from handlerForMsgType")
continue
}
// Dispatch handler
rpmes, err := handler(mPeer, pmes, nil)
if err != nil {
log.Debugf("handle message error: %s", err)
continue
}
// If nil response, return it before serializing
if rpmes == nil {
continue
}
// give back request id
rpmes.RequestId = pmes.RequestId
rpmes.IsResponse = true
// Send out response msg
if err := ms.SendMessage(service.ctx, rpmes); err != nil {
log.Debugf("send response error: %s", err)
continue
}
}
}
func (service *OpenBazaarService) SendRequest(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
log.Debugf("Sending %s request to %s", pmes.MessageType.String(), p.Pretty())
ms := service.messageSenderForPeer(p, nil)
rpmes, err := ms.SendRequest(ctx, pmes)
if err != nil {
log.Debugf("No response from %s", p.Pretty())
return nil, err
}
if rpmes == nil {
log.Debugf("No response from %s", p.Pretty())
return nil, errors.New("no response from peer")
}
log.Debugf("Received response from %s", p.Pretty())
return rpmes, nil
}
func (service *OpenBazaarService) SendMessage(ctx context.Context, p peer.ID, pmes *pb.Message) error {
log.Debugf("Sending %s message to %s", pmes.MessageType.String(), p.Pretty())
ms := service.messageSenderForPeer(p, nil)
if err := ms.SendMessage(ctx, pmes); err != nil {
return err
}
return nil
}