Add polling flag to prevent concurrent requests in long polling

wssshd2/html_pages/terminal_page.h

@@ -484,17 +484,17 @@ static const char *terminal_page_html =
 "                    term.write(data);\n"
 "                }\n"
 "            }\n"
-"            // Schedule next poll\n"
+"            // Schedule next poll immediately for long polling\n"
 "            if (pollInterval) {\n"
-"                pollInterval = setTimeout(pollData, 300);\n"
+"                pollInterval = setTimeout(pollData, 50);\n"
 "            }\n"
 "        }\n"
 "    })\n"
 "    .catch(error => {\n"
 "        console.error('Polling error:', error);\n"
-"        // Continue polling even on error\n"
+"        // Continue polling even on error, but with delay\n"
 "        if (pollInterval) {\n"
-"            pollInterval = setTimeout(pollData, 300);\n"
+"            pollInterval = setTimeout(pollData, 1000);\n"
 "        }\n"
 "    });\n"
 "}\n"

wssshd2/image_data.h

@@ -7,8 +7,8 @@ unsigned char image_jpg[] = {
   0x30, 0x00, 0x00, 0xea, 0x60, 0x00, 0x00, 0x3a, 0x98, 0x00, 0x00, 0x17,
   0x70, 0x9c, 0xba, 0x51, 0x3c, 0x00, 0x00, 0x00, 0x06, 0x62, 0x4b, 0x47,
   0x44, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0xa0, 0xbd, 0xa7, 0x93, 0x00,
-  0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 0x45, 0x07, 0xe9, 0x09, 0x16, 0x0f,
-  0x2d, 0x23, 0x0c, 0xec, 0xe6, 0x78, 0x00, 0x00, 0x05, 0xd4, 0x7a, 0x54,
+  0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 0x45, 0x07, 0xe9, 0x09, 0x16, 0x10,
+  0x06, 0x26, 0x1d, 0x8c, 0x0b, 0xd3, 0x00, 0x00, 0x05, 0xd4, 0x7a, 0x54,
   0x58, 0x74, 0x52, 0x61, 0x77, 0x20, 0x70, 0x72, 0x6f, 0x66, 0x69, 0x6c,
   0x65, 0x20, 0x74, 0x79, 0x70, 0x65, 0x20, 0x61, 0x70, 0x70, 0x31, 0x00,
   0x00, 0x48, 0x89, 0x85, 0x96, 0x59, 0x92, 0xdc, 0x38, 0x10, 0x43, 0xff,

wssshd2/templates/terminal.html

@@ -119,6 +119,7 @@ let fitAddon = null;
 let connected = false;
 let requestId = null;
 let pollInterval = null;
+let polling = false;
 
 console.log('Terminal page loaded, adding event listeners');
 document.getElementById('connectBtn').addEventListener('click', connect);
@@ -426,7 +427,8 @@ function disconnect() {
 }
 
 function pollData() {
-    if (!requestId) return;
+    if (!requestId || polling) return;
+    polling = true;
     fetch('/terminal/%s/xterm/data?request_id=' + encodeURIComponent(requestId))
     .then(response => {
         if (response.status !== 200) {
@@ -462,7 +464,7 @@ function pollData() {
             }
             // Schedule next poll immediately for long polling
             if (pollInterval) {
-                pollInterval = setTimeout(pollData, 0);
+                pollInterval = setTimeout(pollData, 50);
             }
         }
     })

wssshd2/templates/terminal.html~

@@ -354,9 +354,9 @@ function connect() {
                 console.log('Launching command:', data.command);
             }
             term.write('Connected successfully!\r\n');
-            setTimeout(() => {
-                pollInterval = setInterval(pollData, 200);
-            }, 200);
+            pollInterval = setInterval(pollData, 500);
+            // Poll immediately to get any buffered output
+            pollData();
         } else {
             term.write('Error: ' + (data.error || 'Unknown error') + '\r\n');
             disconnect();
@@ -402,7 +402,7 @@ function disconnect() {
     document.getElementById('sshUsername').disabled = false;
 
     if (pollInterval) {
-        clearInterval(pollInterval);
+        clearTimeout(pollInterval);
         pollInterval = null;
     }
 
@@ -443,10 +443,13 @@ function pollData() {
         console.log('Poll data received:', data);
         if (data.ended !== undefined) {
             console.log('Session ended, reloading page');
-            clearInterval(pollInterval);
+            if (pollInterval) {
+                clearTimeout(pollInterval);
                 pollInterval = null;
+            }
             location.reload();
-        } else if (data) {
+        } else {
+            if (data) {
                 console.log('Received data:', data.byteLength || data.length, 'bytes/characters');
                 // Write data to terminal
                 if (data.byteLength !== undefined) {
@@ -457,13 +460,17 @@ function pollData() {
                     term.write(data);
                 }
             }
+            // Schedule next poll immediately for long polling
+            if (pollInterval) {
+                pollInterval = setTimeout(pollData, 0);
+            }
+        }
     })
     .catch(error => {
         console.error('Polling error:', error);
-        // Stop polling on error
+        // Continue polling even on error, but with delay
         if (pollInterval) {
-            clearInterval(pollInterval);
-            pollInterval = null;
+            pollInterval = setTimeout(pollData, 1000);
         }
     });
 }