mirror of
https://github.com/netbirdio/netbird.git
synced 2024-12-01 12:33:53 +01:00
122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
package signal
|
|
|
|
import (
|
|
"context"
|
|
"flag"
|
|
"fmt"
|
|
log "github.com/sirupsen/logrus"
|
|
"github.com/wiretrustee/wiretrustee/signal/peer"
|
|
"github.com/wiretrustee/wiretrustee/signal/proto"
|
|
"google.golang.org/grpc"
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/metadata"
|
|
"google.golang.org/grpc/status"
|
|
"io"
|
|
"net"
|
|
)
|
|
|
|
var (
|
|
port = flag.Int("port", 10000, "The server port")
|
|
)
|
|
|
|
type SignalExchangeServer struct {
|
|
registry *peer.Registry
|
|
}
|
|
|
|
func NewServer() *SignalExchangeServer {
|
|
return &SignalExchangeServer{
|
|
registry: peer.NewRegistry(),
|
|
}
|
|
}
|
|
|
|
func (s *SignalExchangeServer) Connect(ctx context.Context, msg *proto.Message) (*proto.Message, error) {
|
|
|
|
if _, found := s.registry.Peers[msg.Key]; found {
|
|
return nil, fmt.Errorf("unknown peer %s", msg.Key)
|
|
}
|
|
|
|
if dstPeer, found := s.registry.Peers[msg.RemoteKey]; found {
|
|
//forward the message to the target peer
|
|
err := dstPeer.Stream.Send(msg)
|
|
if err != nil {
|
|
log.Errorf("error while forwarding message from peer [%s] to peer [%s]", msg.Key, msg.RemoteKey)
|
|
//todo respond to the sender?
|
|
}
|
|
} else {
|
|
log.Warnf("message from peer [%s] can't be forwarded to peer [%s] because destination peer is not connected", msg.Key, msg.RemoteKey)
|
|
//todo respond to the sender?
|
|
}
|
|
return &proto.Message{}, nil
|
|
}
|
|
|
|
func (s *SignalExchangeServer) ConnectStream(stream proto.SignalExchange_ConnectStreamServer) error {
|
|
p, err := s.connectPeer(stream)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
log.Infof("peer [%s] has successfully connected", p.Id)
|
|
|
|
for {
|
|
msg, err := stream.Recv()
|
|
if err == io.EOF {
|
|
break
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
log.Debugf("received a new message from peer [%s] to peer [%s]", p.Id, msg.RemoteKey)
|
|
// lookup the target peer where the message is going to
|
|
if dstPeer, found := s.registry.Peers[msg.RemoteKey]; found {
|
|
//forward the message to the target peer
|
|
err := dstPeer.Stream.Send(msg)
|
|
if err != nil {
|
|
log.Errorf("error while forwarding message from peer [%s] to peer [%s]", p.Id, msg.RemoteKey)
|
|
//todo respond to the sender?
|
|
}
|
|
} else {
|
|
log.Warnf("message from peer [%s] can't be forwarded to peer [%s] because destination peer is not connected", p.Id, msg.RemoteKey)
|
|
//todo respond to the sender?
|
|
}
|
|
|
|
}
|
|
<-stream.Context().Done()
|
|
return stream.Context().Err()
|
|
}
|
|
|
|
// Handles initial Peer connection.
|
|
// Each connection must provide an ID header.
|
|
// At this moment the connecting Peer will be registered in the peer.Registry
|
|
func (s SignalExchangeServer) connectPeer(stream proto.SignalExchange_ConnectStreamServer) (*peer.Peer, error) {
|
|
if meta, hasMeta := metadata.FromIncomingContext(stream.Context()); hasMeta {
|
|
if id, found := meta[proto.HeaderId]; found {
|
|
p := peer.NewPeer(id[0], stream)
|
|
s.registry.Register(p)
|
|
return p, nil
|
|
} else {
|
|
return nil, status.Errorf(codes.FailedPrecondition, "missing connection header: "+proto.HeaderId)
|
|
}
|
|
} else {
|
|
return nil, status.Errorf(codes.FailedPrecondition, "missing connection stream meta")
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
flag.Parse()
|
|
|
|
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
|
|
if err != nil {
|
|
log.Fatalf("failed to listen: %v", err)
|
|
}
|
|
|
|
if err != nil {
|
|
log.Fatalf("failed to listen: %v", err)
|
|
}
|
|
var opts []grpc.ServerOption
|
|
grpcServer := grpc.NewServer(opts...)
|
|
proto.RegisterSignalExchangeServer(grpcServer, NewServer())
|
|
log.Printf("started server: localhost:%v", *port)
|
|
if err := grpcServer.Serve(lis); err != nil {
|
|
log.Fatalf("failed to serve: %v", err)
|
|
}
|
|
}
|