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package nspkt
import (
_ "embed"
"encoding/hex"
"encoding/json"
"io"
"net/http"
"strconv"
)
//go:embed monitor.html
var monitorHTML []byte
// DebugMonitorHandler returns a HTTP handler which serves a webpage to monitor
// sent and received connectionless packets in real-time.
func DebugMonitorHandler(l *Listener) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "private, no-cache, no-store")
w.Header().Set("Expires", "0")
w.Header().Set("Pragma", "no-cache")
if r.URL.RawQuery != "sse" {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("Content-Length", strconv.Itoa(len(monitorHTML)))
w.WriteHeader(http.StatusOK)
w.Write(monitorHTML)
return
}
f, ok := w.(http.Flusher)
if !ok {
http.Error(w, "cannot stream events", http.StatusInternalServerError)
return
}
c := make(chan MonitorPacket, 16)
go l.Monitor(r.Context(), c)
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Connection", "keep-alive")
w.WriteHeader(http.StatusOK)
io.WriteString(w, "event: init\ndata: ")
if addr := l.LocalAddr(); addr != nil {
io.WriteString(w, addr.String())
}
io.WriteString(w, "\n\n")
f.Flush()
e := json.NewEncoder(w)
for p := range c {
io.WriteString(w, "event: packet\ndata: ")
e.Encode(map[string]any{
"in": p.In,
"remote": p.Remote.String(),
"desc": p.Desc,
"data": hex.Dump(p.Data),
})
io.WriteString(w, "\n")
f.Flush()
}
})
}
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