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multistream.go
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/
multistream.go
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// package multistream implements a peerstream transport using
// go-multistream to select the underlying stream muxer
package multistream
import (
"net"
mss "github.com/whyrusleeping/go-multistream"
smux "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-stream-muxer"
multiplex "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-stream-muxer/multiplex"
spdy "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-stream-muxer/spdystream"
yamux "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-stream-muxer/yamux"
)
type transport struct {
mux *mss.MultistreamMuxer
tpts map[string]smux.Transport
}
func NewTransport() smux.Transport {
mux := mss.NewMultistreamMuxer()
mux.AddHandler("/multiplex", nil)
mux.AddHandler("/spdystream", nil)
mux.AddHandler("/yamux", nil)
tpts := map[string]smux.Transport{
"/multiplex": multiplex.DefaultTransport,
"/spdystream": spdy.Transport,
"/yamux": yamux.DefaultTransport,
}
return &transport{
mux: mux,
tpts: tpts,
}
}
func (t *transport) NewConn(nc net.Conn, isServer bool) (smux.Conn, error) {
var proto string
if isServer {
selected, _, err := t.mux.Negotiate(nc)
if err != nil {
return nil, err
}
proto = selected
} else {
// prefer yamux
selected, err := mss.SelectOneOf([]string{"/yamux", "/spdystream", "/multiplex"}, nc)
if err != nil {
return nil, err
}
proto = selected
}
tpt := t.tpts[proto]
return tpt.NewConn(nc, isServer)
}