func (pr *consulPipeRouter) privateAPI() {
router := mux.NewRouter()
router.Methods("GET").
MatcherFunc(app.URLMatcher("/private/api/pipe/{key}")).
HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
key := mux.Vars(r)["key"]
log.Infof("%s: Server bridge connection started", key)
defer log.Infof("%s: Server bridge connection stopped", key)
pipe := pr.getPipe(key)
if pipe == nil {
log.Errorf("%s: Server bridge connection; Unknown pipe!", key)
w.WriteHeader(http.StatusNotFound)
return
}
conn, err := xfer.Upgrade(w, r, nil)
if err != nil {
log.Errorf("%s: Server bridge connection; Error upgrading to websocket: %v", key, err)
return
}
defer conn.Close()
end, _ := pipe.Ends()
if err := pipe.CopyToWebsocket(end, conn); err != nil && !xfer.IsExpectedWSCloseError(err) {
log.Errorf("%s: Server bridge connection; Error copying pipe to websocket: %v", key, err)
}
})
log.Infof("Serving private API on endpoint %s.", pr.advertise)
log.Infof("Private API terminated: %v", http.ListenAndServe(pr.advertise, router))
}
func (bc *bridgeConnection) loop() {
log.Infof("%s: Client bridge connection started", bc.key)
defer bc.wait.Done()
defer log.Infof("%s: Client bridge connection stopped", bc.key)
_, end := bc.pipe.Ends()
url := fmt.Sprintf("ws://%s/private/api/pipe/%s", bc.addr, url.QueryEscape(bc.key))
for {
bc.mtx.Lock()
bc.conn = nil
if bc.stopped {
bc.mtx.Unlock()
return
}
bc.mtx.Unlock()
// connect to other pipes instance
conn, _, err := xfer.DialWS(wsDialer, url, http.Header{})
if err != nil {
log.Errorf("%s: Client bridge connection; Error connecting to %s: %v", bc.key, url, err)
time.Sleep(time.Second) // TODO backoff
continue
}
bc.mtx.Lock()
if bc.stopped {
bc.mtx.Unlock()
conn.Close()
return
}
bc.conn = conn
bc.mtx.Unlock()
if err := bc.pipe.CopyToWebsocket(end, conn); err != nil && !xfer.IsExpectedWSCloseError(err) {
log.Errorf("%s: Client bridge connection; Error copying pipe to websocket: %v", bc.key, err)
}
conn.Close()
}
}
// handleProbeWS accepts websocket connections from the probe and registers
// them in the control router, such that HandleControl calls can find them.
func handleProbeWS(cr ControlRouter) CtxHandlerFunc {
return func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
probeID := r.Header.Get(xfer.ScopeProbeIDHeader)
if probeID == "" {
respondWith(w, http.StatusBadRequest, xfer.ScopeProbeIDHeader)
return
}
conn, err := xfer.Upgrade(w, r, nil)
if err != nil {
log.Printf("Error upgrading control websocket: %v", err)
return
}
defer conn.Close()
codec := xfer.NewJSONWebsocketCodec(conn)
client := rpc.NewClientWithCodec(codec)
defer client.Close()
id, err := cr.Register(ctx, probeID, func(req xfer.Request) xfer.Response {
var res xfer.Response
if err := client.Call("control.Handle", req, &res); err != nil {
return xfer.ResponseError(err)
}
return res
})
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
defer cr.Deregister(ctx, probeID, id)
if err := codec.WaitForReadError(); err != nil && err != io.EOF && !xfer.IsExpectedWSCloseError(err) {
log.Errorf("Error on websocket: %v", err)
}
}
}
func handlePipeWs(pr PipeRouter, end End) CtxHandlerFunc {
return func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["pipeID"]
pipe, endIO, err := pr.Get(ctx, id, end)
if err != nil {
log.Errorf("Error getting pipe %s: %v", id, err)
http.NotFound(w, r)
return
}
defer pr.Release(ctx, id, end)
conn, err := xfer.Upgrade(w, r, nil)
if err != nil {
log.Errorf("Error upgrading pipe %s (%d) websocket: %v", id, end, err)
return
}
defer conn.Close()
log.Infof("Success got pipe %s:%s", id, end)
if err := pipe.CopyToWebsocket(endIO, conn); err != nil && !xfer.IsExpectedWSCloseError(err) {
log.Printf("Error copying to pipe %s (%d) websocket: %v", id, end, err)
}
}
}
// Websocket for the full topology.
func handleWebsocket(
ctx context.Context,
rep Reporter,
w http.ResponseWriter,
r *http.Request,
) {
if err := r.ParseForm(); err != nil {
respondWith(w, http.StatusInternalServerError, err.Error())
return
}
loop := websocketLoop
if t := r.Form.Get("t"); t != "" {
var err error
if loop, err = time.ParseDuration(t); err != nil {
respondWith(w, http.StatusBadRequest, t)
return
}
}
conn, err := xfer.Upgrade(w, r, nil)
if err != nil {
// log.Info("Upgrade:", err)
return
}
defer conn.Close()
quit := make(chan struct{})
go func(c xfer.Websocket) {
for { // just discard everything the browser sends
if _, _, err := c.ReadMessage(); err != nil {
if !xfer.IsExpectedWSCloseError(err) {
log.Println("err:", err)
}
close(quit)
break
}
}
}(conn)
var (
previousTopo detailed.NodeSummaries
tick = time.Tick(loop)
wait = make(chan struct{}, 1)
topologyID = mux.Vars(r)["topology"]
)
rep.WaitOn(ctx, wait)
defer rep.UnWait(ctx, wait)
for {
report, err := rep.Report(ctx)
if err != nil {
log.Errorf("Error generating report: %v", err)
return
}
renderer, decorator, err := topologyRegistry.rendererForTopology(topologyID, r.Form, report)
if err != nil {
log.Errorf("Error generating report: %v", err)
return
}
newTopo := detailed.Summaries(report, renderer.Render(report, decorator))
diff := detailed.TopoDiff(previousTopo, newTopo)
previousTopo = newTopo
if err := conn.WriteJSON(diff); err != nil {
if !xfer.IsExpectedWSCloseError(err) {
log.Errorf("cannot serialize topology diff: %s", err)
}
return
}
select {
case <-wait:
case <-tick:
case <-quit:
return
}
}
}