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p2p.go
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p2p.go
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package p2p
import (
"context"
"errors"
"time"
net "gx/ipfs/QmNa31VPzC561NWwRsJLE7nGYZYuuD2QfpK2b1q9BK54J1/go-libp2p-net"
pstore "gx/ipfs/QmPgDWmTmuzvP7QE5zwo1TmjbJme9pmZHNujB2453jkCTr/go-libp2p-peerstore"
manet "gx/ipfs/QmX3U3YXCQ6UYBxq2LVWF8dARS1hPUTEYLrSx654Qyxyw6/go-multiaddr-net"
ma "gx/ipfs/QmXY77cVe7rVRQXZZQRioukUM7aRW3BTcAgJe12MCtb3Ji/go-multiaddr"
peer "gx/ipfs/QmXYjuNuxVzXKJCfWasQk1RqkhVLDM9jtUKhqc2WPQmFSB/go-libp2p-peer"
pro "gx/ipfs/QmZNkThpqfVXs9GNbexPrfBbXSLNYeKrE7jwFM2oqHbyqN/go-libp2p-protocol"
p2phost "gx/ipfs/Qmc1XhrFEiSeBNn3mpfg6gEuYCt5im2gYmNVmncsvmpeAk/go-libp2p-host"
)
// P2P structure holds information on currently running streams/listeners
type P2P struct {
Listeners ListenerRegistry
Streams StreamRegistry
identity peer.ID
peerHost p2phost.Host
peerstore pstore.Peerstore
}
// NewP2P creates new P2P struct
func NewP2P(identity peer.ID, peerHost p2phost.Host, peerstore pstore.Peerstore) *P2P {
return &P2P{
identity: identity,
peerHost: peerHost,
peerstore: peerstore,
}
}
func (p2p *P2P) newStreamTo(ctx2 context.Context, p peer.ID, protocol string) (net.Stream, error) {
ctx, cancel := context.WithTimeout(ctx2, time.Second*30) //TODO: configurable?
defer cancel()
err := p2p.peerHost.Connect(ctx, pstore.PeerInfo{ID: p})
if err != nil {
return nil, err
}
return p2p.peerHost.NewStream(ctx2, p, pro.ID(protocol))
}
// Dial creates new P2P stream to a remote listener
func (p2p *P2P) Dial(ctx context.Context, addr ma.Multiaddr, peer peer.ID, proto string, bindAddr ma.Multiaddr) (*ListenerInfo, error) {
lnet, _, err := manet.DialArgs(bindAddr)
if err != nil {
return nil, err
}
listenerInfo := ListenerInfo{
Identity: p2p.identity,
Protocol: proto,
}
remote, err := p2p.newStreamTo(ctx, peer, proto)
if err != nil {
return nil, err
}
switch lnet {
case "tcp", "tcp4", "tcp6":
listener, err := manet.Listen(bindAddr)
if err != nil {
if err2 := remote.Reset(); err2 != nil {
return nil, err2
}
return nil, err
}
listenerInfo.Address = listener.Multiaddr()
listenerInfo.Closer = listener
listenerInfo.Running = true
go p2p.doAccept(&listenerInfo, remote, listener)
default:
return nil, errors.New("unsupported protocol: " + lnet)
}
return &listenerInfo, nil
}
func (p2p *P2P) doAccept(listenerInfo *ListenerInfo, remote net.Stream, listener manet.Listener) {
defer listener.Close()
local, err := listener.Accept()
if err != nil {
return
}
stream := StreamInfo{
Protocol: listenerInfo.Protocol,
LocalPeer: listenerInfo.Identity,
LocalAddr: listenerInfo.Address,
RemotePeer: remote.Conn().RemotePeer(),
RemoteAddr: remote.Conn().RemoteMultiaddr(),
Local: local,
Remote: remote,
Registry: &p2p.Streams,
}
p2p.Streams.Register(&stream)
stream.startStreaming()
}
// Listener wraps stream handler into a listener
type Listener interface {
Accept() (net.Stream, error)
Close() error
}
// P2PListener holds information on a listener
type P2PListener struct {
peerHost p2phost.Host
conCh chan net.Stream
proto pro.ID
ctx context.Context
cancel func()
}
// Accept waits for a connection from the listener
func (il *P2PListener) Accept() (net.Stream, error) {
select {
case c := <-il.conCh:
return c, nil
case <-il.ctx.Done():
return nil, il.ctx.Err()
}
}
// Close closes the listener and removes stream handler
func (il *P2PListener) Close() error {
il.cancel()
il.peerHost.RemoveStreamHandler(il.proto)
return nil
}
// Listen creates new P2PListener
func (p2p *P2P) registerStreamHandler(ctx2 context.Context, protocol string) (*P2PListener, error) {
ctx, cancel := context.WithCancel(ctx2)
list := &P2PListener{
peerHost: p2p.peerHost,
proto: pro.ID(protocol),
conCh: make(chan net.Stream),
ctx: ctx,
cancel: cancel,
}
p2p.peerHost.SetStreamHandler(list.proto, func(s net.Stream) {
select {
case list.conCh <- s:
case <-ctx.Done():
s.Reset()
}
})
return list, nil
}
// NewListener creates new p2p listener
func (p2p *P2P) NewListener(ctx context.Context, proto string, addr ma.Multiaddr) (*ListenerInfo, error) {
listener, err := p2p.registerStreamHandler(ctx, proto)
if err != nil {
return nil, err
}
listenerInfo := ListenerInfo{
Identity: p2p.identity,
Protocol: proto,
Address: addr,
Closer: listener,
Running: true,
Registry: &p2p.Listeners,
}
go p2p.acceptStreams(&listenerInfo, listener)
p2p.Listeners.Register(&listenerInfo)
return &listenerInfo, nil
}
func (p2p *P2P) acceptStreams(listenerInfo *ListenerInfo, listener Listener) {
for listenerInfo.Running {
remote, err := listener.Accept()
if err != nil {
listener.Close()
break
}
local, err := manet.Dial(listenerInfo.Address)
if err != nil {
remote.Reset()
continue
}
stream := StreamInfo{
Protocol: listenerInfo.Protocol,
LocalPeer: listenerInfo.Identity,
LocalAddr: listenerInfo.Address,
RemotePeer: remote.Conn().RemotePeer(),
RemoteAddr: remote.Conn().RemoteMultiaddr(),
Local: local,
Remote: remote,
Registry: &p2p.Streams,
}
p2p.Streams.Register(&stream)
stream.startStreaming()
}
p2p.Listeners.Deregister(listenerInfo.Protocol)
}
// CheckProtoExists checks whether a protocol handler is registered to
// mux handler
func (p2p *P2P) CheckProtoExists(proto string) bool {
protos := p2p.peerHost.Mux().Protocols()
for _, p := range protos {
if p != proto {
continue
}
return true
}
return false
}