traefik/middlewares/websocket.go

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package middlewares
import (
"net/http"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/mailgun/oxy/roundrobin"
)
// WebsocketUpgrader holds Websocket configuration.
type WebsocketUpgrader struct {
rr *roundrobin.RoundRobin
}
// NewWebsocketUpgrader returns a new WebsocketUpgrader.
func NewWebsocketUpgrader(rr *roundrobin.RoundRobin) *WebsocketUpgrader {
wu := WebsocketUpgrader{
rr: rr,
}
return &wu
}
func (u *WebsocketUpgrader) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// If request is websocket, serve with golang websocket server to do protocol handshake
if strings.Join(req.Header["Upgrade"], "") == "websocket" {
start := time.Now().UTC()
url, err := u.rr.NextServer()
if err != nil {
log.Errorf("Can't round robin in websocket middleware")
return
}
log.Debugf("Websocket forward to %s", url.String())
NewProxy(url).ServeHTTP(w, req)
if req.TLS != nil {
log.Debugf("Round trip: %v, duration: %v tls:version: %x, tls:resume:%t, tls:csuite:%x, tls:server:%v",
req.URL, time.Now().UTC().Sub(start),
req.TLS.Version,
req.TLS.DidResume,
req.TLS.CipherSuite,
req.TLS.ServerName)
} else {
log.Debugf("Round trip: %v, duration: %v",
req.URL, time.Now().UTC().Sub(start))
}
return
}
u.rr.ServeHTTP(w, req)
}