added Function to create CAN-Traces from WebUI

Software/data_src/static/js/websocket.js

@@ -5,6 +5,106 @@ var statusMapping;
 var staticMapping;
 var overlay;
 
+let traceActive = false;
+let traceMode = null;
+let traceFileName = "";
+let traceUseFsAccess = false;
+
+// File-System-Access-Stream (Chromium)
+let traceWriter = null;
+let traceEncoder = null;
+let traceWriteQueue = Promise.resolve(); // für geordnete Writes
+
+// Fallback: In-Memory-Sammeln (für Blob-Download bei STOP)
+let traceMemParts = [];
+
+// Textarea & Status
+const TRACE_MAX_CHARS = 200000; // ~200 KB für die Anzeige
+
+function $(id) {
+  return document.getElementById(id);
+}
+
+function $(id) {
+  return document.getElementById(id);
+}
+function nowIsoCompact() {
+  return new Date().toISOString().replace(/[:.]/g, "-");
+}
+function genTraceFileName(mode) {
+  return `cantrace-${mode}-${nowIsoCompact()}.log`;
+}
+
+function setTraceUI(active, mode, infoText) {
+  traceActive = !!active;
+  traceMode = active ? mode : null;
+
+  const btnRaw = $("trace-start");
+  const btnObd = $("trace-start-obd");
+  const btnStop = $("trace-stop");
+  const status = $("trace-status");
+
+  if (btnRaw) btnRaw.disabled = active;
+  if (btnObd) btnObd.disabled = active;
+  if (btnStop) btnStop.disabled = !active;
+
+  if (status)
+    status.textContent =
+      infoText || (active ? `Trace aktiv (${mode})` : "Trace inaktiv");
+}
+
+function traceClear() {
+  const out = $("trace-out");
+  if (out) out.value = "";
+}
+
+function traceAppend(text) {
+  const out = $("trace-out");
+  if (!out || !text) return;
+  out.value += text;
+  if (out.value.length > TRACE_MAX_CHARS) {
+    out.value = out.value.slice(-TRACE_MAX_CHARS);
+  }
+  out.scrollTop = out.scrollHeight;
+}
+
+function triggerBlobDownload(filename, blob) {
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = filename;
+  document.body.appendChild(a);
+  a.click();
+  setTimeout(() => {
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  }, 0);
+}
+
+function parseKv(s) {
+  const out = Object.create(null);
+  s.split(";").forEach((part) => {
+    const eq = part.indexOf("=");
+    if (eq > 0) {
+      const k = part.slice(0, eq).trim();
+      const v = part.slice(eq + 1).trim();
+      if (k) out[k] = v;
+    }
+  });
+  return out;
+}
+
+// geordnete Writes auf File System Access Writer
+function writeToFs(chunk) {
+  if (!traceUseFsAccess || !traceWriter) return;
+  const data = traceEncoder
+    ? traceEncoder.encode(chunk)
+    : new TextEncoder().encode(chunk);
+  traceWriteQueue = traceWriteQueue
+    .then(() => traceWriter.write(data))
+    .catch(console.error);
+}
+
 document.addEventListener("DOMContentLoaded", function () {
   // Ihr JavaScript-Code hier, einschließlich der onLoad-Funktion
   overlay = document.getElementById("overlay");
@@ -45,16 +145,32 @@ function initSettingInputs() {
 
 function onOpen(event) {
   console.log("Connection opened");
+  setTraceUI(false, null, "Verbunden – Trace inaktiv");
 }
 
 function onClose(event) {
   console.log("Connection closed");
   setTimeout(initWebSocket, 1000);
   overlay.style.display = "flex";
+
+  // Falls Trace noch aktiv war: lokal finalisieren
+  if (traceActive) {
+    const note = "Trace beendet (Verbindung getrennt)";
+    if (traceUseFsAccess && traceWriter) {
+      traceWriteQueue.then(() => traceWriter.close()).catch(console.error);
+      traceWriter = null;
+    } else if (traceMemParts.length) {
+      const blob = new Blob(traceMemParts, { type: "text/plain" });
+      triggerBlobDownload(traceFileName || "cantrace.log", blob);
+      traceMemParts = [];
+    }
+    setTraceUI(false, null, note);
+    showNotification(note, "warning");
+  }
 }
 
-function sendButton(event) {
-  var targetElement = event.target;
+async function sendButton(event) {
+  const targetElement = event.target;
 
   if (
     targetElement.classList.contains("confirm") &&
@@ -62,7 +178,46 @@ function sendButton(event) {
   )
     return;
 
-  websocket_sendevent("btn-" + targetElement.id, targetElement.value);
+  const wsid = targetElement.dataset.wsid || targetElement.id; // z.B. "trace-start"
+  const val = targetElement.value || "";
+
+  // File-Ziel *vor* dem WS-Start öffnen (nur bei trace-start; wegen User-Gesture!)
+  if (wsid === "trace-start") {
+    const mode = val || "raw";
+    traceFileName = genTraceFileName(mode);
+
+    // Anzeige schon mal leeren
+    traceClear();
+    setTraceUI(false, null, "Trace wird gestartet…");
+
+    traceUseFsAccess = false;
+    traceWriter = null;
+    traceEncoder = null;
+    traceWriteQueue = Promise.resolve();
+    traceMemParts = []; // Fallback-Puffer leeren
+
+    if (window.showSaveFilePicker) {
+      try {
+        const fh = await showSaveFilePicker({
+          suggestedName: traceFileName,
+          types: [
+            {
+              description: "Text Log",
+              accept: { "text/plain": [".log", ".txt"] },
+            },
+          ],
+        });
+        traceWriter = await fh.createWritable();
+        traceEncoder = new TextEncoder();
+        traceUseFsAccess = true;
+      } catch (e) {
+        // Nutzer hat evtl. abgebrochen → Fallback in RAM
+        traceUseFsAccess = false;
+      }
+    }
+  }
+
+  websocket_sendevent("btn-" + wsid, val);
 }
 
 function onMessage(event) {
@@ -101,6 +256,58 @@ function onMessage(event) {
     fillValuesToHTML(result);
     overlay.style.display = "none";
   }
+  // --- Trace: Start ---
+  else if (data.startsWith("STARTTRACE;")) {
+    const kv = parseKv(data.slice(11)); // mode=..., ts=...
+    const mode = kv.mode || "?";
+    setTraceUI(true, mode, `Trace gestartet (${mode})`);
+
+    // Fallback: wenn kein FS-Access → in RAM sammeln
+    // (sonst haben wir traceWriter bereits im Klick vorbereitet)
+  }
+  // --- Trace: Lines (ggf. mehrere in einer WS-Nachricht) ---
+  else if (data.startsWith("TRACELINE;")) {
+    const payload = data.replace(/TRACELINE;/g, ""); // reiner Text inkl. '\n'
+    traceAppend(payload);
+    if (traceUseFsAccess && traceWriter) {
+      writeToFs(payload);
+    } else {
+      traceMemParts.push(payload);
+    }
+  }
+  // --- Trace: Stop/Summary ---
+  else if (data.startsWith("STOPTRACE;")) {
+    const kv = parseKv(data.slice(10));
+    const msg = `Trace beendet (${kv.mode || "?"}), Zeilen=${
+      kv.lines || "0"
+    }, Drops=${kv.drops || "0"}${kv.reason ? ", Grund=" + kv.reason : ""}`;
+
+    // Datei finalisieren
+    if (traceUseFsAccess && traceWriter) {
+      traceWriteQueue.then(() => traceWriter.close()).catch(console.error);
+      traceWriter = null;
+    } else if (traceMemParts.length) {
+      const blob = new Blob(traceMemParts, { type: "text/plain" });
+      triggerBlobDownload(traceFileName || "cantrace.log", blob);
+      traceMemParts = [];
+    }
+
+    setTraceUI(false, null, msg);
+    showNotification(msg, "info");
+  }
+  // --- Busy/Fehler/Ack ---
+  else if (data.startsWith("TRACEBUSY;")) {
+    const kv = parseKv(data.slice(10));
+    const owner = kv.owner ? " (Owner #" + kv.owner + ")" : "";
+    showNotification("Trace bereits aktiv" + owner, "warning");
+  } else if (data.startsWith("TRACEERROR;")) {
+    const kv = parseKv(data.slice(11));
+    showNotification("Trace-Fehler: " + (kv.msg || "unbekannt"), "danger");
+  } else if (data.startsWith("TRACEACK;")) {
+    // optional
+    const kv = parseKv(data.slice(9));
+    console.log("TRACEACK", kv);
+  }
 }
 
 function createMapping(mappingString) {