func singleConn(t *testing.T, tr smux.Transport) echoSetup {
swarm := ps.NewSwarm(tr)
swarm.SetStreamHandler(func(s *ps.Stream) {
defer s.Close()
log("accepted stream")
io.Copy(s, s) // echo everything
log("closing stream")
})
log("listening at %s", "localhost:0")
l, err := net.Listen("tcp", "localhost:0")
checkErr(t, err)
_, err = swarm.AddListener(l)
checkErr(t, err)
log("dialing to %s", l.Addr())
nc1, err := net.Dial("tcp", l.Addr().String())
checkErr(t, err)
c1, err := swarm.AddConn(nc1)
checkErr(t, err)
return echoSetup{
swarm: swarm,
conns: []*ps.Conn{c1},
}
}
// NewSwarm constructs a Swarm, with a Chan.
func NewSwarm(ctx context.Context, listenAddrs []ma.Multiaddr,
local peer.ID, peers peer.Peerstore, bwc metrics.Reporter) (*Swarm, error) {
listenAddrs, err := filterAddrs(listenAddrs)
if err != nil {
return nil, err
}
s := &Swarm{
swarm: ps.NewSwarm(PSTransport),
local: local,
peers: peers,
ctx: ctx,
dialT: DialTimeout,
notifs: make(map[inet.Notifiee]ps.Notifiee),
bwc: bwc,
Filters: filter.NewFilters(),
}
// configure Swarm
s.proc = goprocessctx.WithContextAndTeardown(ctx, s.teardown)
s.SetConnHandler(nil) // make sure to setup our own conn handler.
// setup swarm metrics
prom.MustRegisterOrGet(peersTotal)
s.Notify((*metricsNotifiee)(s))
return s, s.listen(listenAddrs)
}
func main() {
// create a new Swarm
swarm := ps.NewSwarm(spdy.Transport)
defer swarm.Close()
// tell swarm what to do with a new incoming streams.
// EchoHandler just echos back anything they write.
swarm.SetStreamHandler(ps.EchoHandler)
l, err := net.Listen("tcp", "localhost:8001")
if err != nil {
die(err)
}
if _, err := swarm.AddListener(l); err != nil {
die(err)
}
nc, err := net.Dial("tcp", "localhost:8001")
if err != nil {
die(err)
}
c, err := swarm.AddConn(nc)
if err != nil {
die(err)
}
nRcvStream := 0
bio := bufio.NewReader(os.Stdin)
swarm.SetStreamHandler(func(s *ps.Stream) {
log("handling new stream %d", nRcvStream)
nRcvStream++
line, err := bio.ReadString('\n')
if err != nil {
die(err)
}
_ = line
// line = "read: " + line
// s.Write([]byte(line))
s.Close()
})
nSndStream := 0
for {
<-time.After(200 * time.Millisecond)
_, err := swarm.NewStreamWithConn(c)
if err != nil {
die(err)
}
log("sender got new stream %d", nSndStream)
nSndStream++
}
}
func SubtestSimpleWrite(t *testing.T, tr smux.Transport) {
swarm := ps.NewSwarm(tr)
defer swarm.Close()
piper, pipew := io.Pipe()
swarm.SetStreamHandler(func(s *ps.Stream) {
defer s.Close()
log("accepted stream")
w := io.MultiWriter(s, pipew)
io.Copy(w, s) // echo everything and write it to pipew
log("closing stream")
})
log("listening at %s", "localhost:0")
l, err := net.Listen("tcp", "localhost:0")
checkErr(t, err)
_, err = swarm.AddListener(l)
checkErr(t, err)
log("dialing to %s", l.Addr().String())
nc1, err := net.Dial("tcp", l.Addr().String())
checkErr(t, err)
c1, err := swarm.AddConn(nc1)
checkErr(t, err)
defer c1.Close()
log("creating stream")
s1, err := c1.NewStream()
checkErr(t, err)
defer s1.Close()
buf1 := randBuf(4096)
log("writing %d bytes to stream", len(buf1))
_, err = s1.Write(buf1)
checkErr(t, err)
buf2 := make([]byte, len(buf1))
log("reading %d bytes from stream (echoed)", len(buf2))
_, err = s1.Read(buf2)
checkErr(t, err)
if string(buf2) != string(buf1) {
t.Error("buf1 and buf2 not equal: %s != %s", string(buf1), string(buf2))
}
buf3 := make([]byte, len(buf1))
log("reading %d bytes from pipe (tee)", len(buf3))
_, err = piper.Read(buf3)
checkErr(t, err)
if string(buf3) != string(buf1) {
t.Error("buf1 and buf3 not equal: %s != %s", string(buf1), string(buf3))
}
}
func makeSwarm(t *testing.T, tr smux.Transport, nListeners int) *ps.Swarm {
swarm := ps.NewSwarm(tr)
swarm.SetStreamHandler(func(s *ps.Stream) {
defer s.Close()
log("accepted stream")
io.Copy(s, s) // echo everything
log("closing stream")
})
for i := 0; i < nListeners; i++ {
log("%p listening at %s", swarm, "localhost:0")
l, err := net.Listen("tcp", "localhost:0")
checkErr(t, err)
_, err = swarm.AddListener(l)
checkErr(t, err)
}
return swarm
}
func SubtestConstructSwarm(t *testing.T, tr smux.Transport) {
ps.NewSwarm(tr)
}
func main() {
log("creating a new swarm with spdystream transport") // create a new Swarm
swarm := ps.NewSwarm(spdy.Transport)
defer swarm.Close()
// tell swarm what to do with a new incoming streams.
// EchoHandler just echos back anything they write.
log("setup EchoHandler")
swarm.SetStreamHandler(ps.EchoHandler)
// Okay, let's try listening on some transports
log("listening at localhost:8001")
l1, err := net.Listen("tcp", "localhost:8001")
if err != nil {
panic(err)
}
log("listening at localhost:8002")
l2, err := net.Listen("tcp", "localhost:8002")
if err != nil {
panic(err)
}
// tell swarm to accept incoming connections on these
// listeners. Swarm will start accepting new connections.
if _, err := swarm.AddListener(l1); err != nil {
panic(err)
}
if _, err := swarm.AddListener(l2); err != nil {
panic(err)
}
// ok, let's try some outgoing connections
log("dialing localhost:8001")
nc1, err := net.Dial("tcp", "localhost:8001")
if err != nil {
panic(err)
}
log("dialing localhost:8002")
nc2, err := net.Dial("tcp", "localhost:8002")
if err != nil {
panic(err)
}
// add them to the swarm
c1, err := swarm.AddConn(nc1)
if err != nil {
panic(err)
}
c2, err := swarm.AddConn(nc2)
if err != nil {
panic(err)
}
// Swarm treats listeners as sources of new connections and does
// not distinguish between outgoing or incoming connections.
// It provides the net.Conn to the StreamHandler so you can
// distinguish between them however you wish.
// now let's try opening some streams!
// You can specify what connection you want to use
log("opening stream with NewStreamWithConn(c1)")
s1, err := swarm.NewStreamWithConn(c1)
if err != nil {
panic(err)
}
// Or, you can specify a SelectConn function that picks between all
// (it calls NewStreamWithConn underneath the hood)
log("opening stream with NewStreamSelectConn(.)")
s2, err := swarm.NewStreamSelectConn(func(conns []*ps.Conn) *ps.Conn {
if len(conns) > 0 {
return conns[0]
}
return nil
})
if err != nil {
panic(err)
}
// Or, you can bind connections to ConnGroup ids. You can bind a conn to
// multiple groups. And, if conn wasn't in swarm, it calls swarm.AddConn.
// You can use any Go `KeyType` as a group A `KeyType` as in maps...)
swarm.AddConnToGroup(c2, 1)
// And then use that group to select a connection. Swarm will use any
// connection it finds in that group, using a SelectConn you can rebind:
// swarm.SetGroupSelectConn(1, SelectConn)
// swarm.SetDegaultGroupSelectConn(SelectConn)
log("opening stream with NewStreamWithGroup(1)")
s3, err := swarm.NewStreamWithGroup(1)
if err != nil {
panic(err)
}
// Why groups? It's because with many connections, and many transports,
// and many Servers (or Protocols), we can use the Swarm to associate
// a different StreamHandlers per group, and to let us create NewStreams
// on a given group.
// Ok, we have streams. now what. Use them! Our Streams are basically
// streams from github.com/docker/spdystream, so they work the same
// way:
log("preparing the streams")
for i, stream := range []*ps.Stream{s1, s2, s3} {
str := "stream %d ready:"
fmt.Fprintf(stream, str, i)
buf := make([]byte, len(str))
log(fmt.Sprintf("reading from stream %d", i))
stream.Read(buf)
fmt.Println(string(buf))
}
log("let's test the streams")
log("enter some text below:\n")
go io.Copy(os.Stdout, s1)
go io.Copy(os.Stdout, s2)
go io.Copy(os.Stdout, s3)
io.Copy(io.MultiWriter(s1, s2, s3), os.Stdin)
}