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service.go
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service.go
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package service
import (
"context"
"errors"
host "gx/ipfs/QmNmJZL7FQySMtE2BQuLMuZg2EB2CLEunJJUSVSc9YnnbV/go-libp2p-host"
ps "gx/ipfs/QmXauCuJzmzapetmC6W4TuDJLL1yFFrVzSHoWv8YdbmnxH/go-libp2p-peerstore"
inet "gx/ipfs/QmXfkENeeBvh3zYA51MaSdGUdBjhQ99cP5WQe8zgr6wchG/go-libp2p-net"
ggio "gx/ipfs/QmZ4Qi3GaRbjcx28Sme5eMH7RQjGkt8wHxt2a65oLaeFEV/gogo-protobuf/io"
protocol "gx/ipfs/QmZNkThpqfVXs9GNbexPrfBbXSLNYeKrE7jwFM2oqHbyqN/go-libp2p-protocol"
peer "gx/ipfs/QmZoWKhxUmZ2seW4BzX6fJkNR8hh9PsGModr7q171yq2SS/go-libp2p-peer"
"sync"
"time"
"io"
"github.com/OpenBazaar/openbazaar-go/core"
"github.com/OpenBazaar/openbazaar-go/pb"
"github.com/OpenBazaar/openbazaar-go/repo"
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
ctx context.Context
broadcast chan repo.Notifier
datastore repo.Datastore
node *core.OpenBazaarNode
sender map[peer.ID]*messageSender
senderlk sync.Mutex
}
func New(node *core.OpenBazaarNode, datastore repo.Datastore) *OpenBazaarService {
service := &OpenBazaarService{
host: node.IpfsNode.PeerHost.(host.Host),
self: node.IpfsNode.Identity,
peerstore: node.IpfsNode.PeerHost.Peerstore(),
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) DisconnectFromPeer(p peer.ID) error {
log.Debugf("Disconnecting from %s", p.Pretty())
service.senderlk.Lock()
defer service.senderlk.Unlock()
ms, ok := service.sender[p]
if !ok {
return nil
}
if ms != nil && ms.s != nil {
ms.s.Close()
}
delete(service.sender, p)
return nil
}
func (service *OpenBazaarService) HandleNewStream(s inet.Stream) {
go service.handleNewMessage(s)
}
func (service *OpenBazaarService) handleNewMessage(s inet.Stream) {
defer s.Close()
cr := ctxio.NewReader(service.ctx, s) // ok to use. we defer close stream in this func
r := ggio.NewDelimitedReader(cr, inet.MessageSizeMax)
mPeer := s.Conn().RemotePeer()
// Check if banned
if service.node.BanManager.IsBanned(mPeer) {
return
}
ms, err := service.messageSenderForPeer(mPeer)
if err != nil {
log.Error("Error getting message sender")
return
}
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 {
s.Reset()
if err == io.EOF {
log.Debugf("Disconnected from peer %s", mPeer.Pretty())
}
return
}
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()
s.Reset()
return
}
// Get handler for this msg type
handler := service.HandlerForMsgType(pmes.MessageType)
if handler == nil {
s.Reset()
log.Debug("Got back nil handler from handlerForMsgType")
return
}
// Dispatch handler
rpmes, err := handler(mPeer, pmes, nil)
if err != nil {
log.Debugf("%s handle message error: %s", pmes.MessageType.String(), err)
}
// 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 {
s.Reset()
log.Debugf("send response error: %s", err)
return
}
}
}
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, err := service.messageSenderForPeer(p)
if err != nil {
return nil, err
}
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 {
if pmes.MessageType != pb.Message_BLOCK {
log.Debugf("Sending %s message to %s", pmes.MessageType.String(), p.Pretty())
}
ms, err := service.messageSenderForPeer(p)
if err != nil {
return err
}
if err := ms.SendMessage(ctx, pmes); err != nil {
return err
}
return nil
}