Add scan concurrency and login delay sliders

Serialised logins now sleep `login_delay` seconds between each SSH
auth to prevent AD/LDAP lockout. Both max sessions (1-10) and login
delay (0-15s) are configurable via UI sliders in the header and
passed as JSON to all scan endpoints.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -34,10 +34,12 @@ def _reschedule(interval_minutes):
     logger.info(f"Auto-scan scheduled every {interval_minutes} minutes")
 
 
-def _trigger_scan_background(dept: str = None):
+def _trigger_scan_background(dept: str = None, workers: int = 5, login_delay: int = 3):
     """Run scan in a background thread. dept=None → all switches."""
     if not scanner.scan_state["running"]:
-        t = threading.Thread(target=scanner.run_scan, kwargs={"dept": dept}, daemon=True)
+        t = threading.Thread(target=scanner.run_scan,
+                             kwargs={"dept": dept, "workers": workers, "login_delay": login_delay},
+                             daemon=True)
         t.start()
 
 
@@ -55,12 +57,20 @@ def index():
     return render_template("index.html")
 
 
+def _scan_params():
+    body = request.get_json(silent=True) or {}
+    workers = max(1, min(10, int(body.get("workers", 5))))
+    login_delay = max(0, min(30, int(body.get("login_delay", 3))))
+    return workers, login_delay
+
+
 @app.route("/api/scan", methods=["POST"])
 def api_scan():
     """Scan all active switches (no dept filter)."""
     if scanner.scan_state["running"]:
         return jsonify({"error": "Scan already running"}), 409
-    _trigger_scan_background(dept=None)
+    workers, login_delay = _scan_params()
+    _trigger_scan_background(dept=None, workers=workers, login_delay=login_delay)
     return jsonify({"status": "started", "dept": None})
 
 
@@ -74,7 +84,8 @@ def api_scan_clear():
     conn.execute("DELETE FROM links")
     conn.commit()
     conn.close()
-    _trigger_scan_background(dept=None)
+    workers, login_delay = _scan_params()
+    _trigger_scan_background(dept=None, workers=workers, login_delay=login_delay)
     return jsonify({"status": "started", "cleared": True})
 
 
@@ -83,7 +94,8 @@ def api_scan_elec():
     """Scan only ELEC department switches."""
     if scanner.scan_state["running"]:
         return jsonify({"error": "Scan already running"}), 409
-    _trigger_scan_background(dept="ELEC")
+    workers, login_delay = _scan_params()
+    _trigger_scan_background(dept="ELEC", workers=workers, login_delay=login_delay)
     return jsonify({"status": "started", "dept": "ELEC"})
 
 
@@ -92,7 +104,8 @@ def api_scan_gw():
     """Scan only GW department switches."""
     if scanner.scan_state["running"]:
         return jsonify({"error": "Scan already running"}), 409
-    _trigger_scan_background(dept="GW")
+    workers, login_delay = _scan_params()
+    _trigger_scan_background(dept="GW", workers=workers, login_delay=login_delay)
     return jsonify({"status": "started", "dept": "GW"})
 
 

index.html

@@ -151,6 +151,44 @@ var Xr=function(e){if(!(this instanceof Xr))return new Xr(e);this.id="Thenable/1
     cursor: pointer;
   }
 
+  .scan-settings-wrap {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    background: var(--surface2);
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 6px 12px;
+    font-size: 12px;
+    color: var(--text-dim);
+  }
+  .scan-settings-wrap input[type=range] {
+    -webkit-appearance: none;
+    width: 70px;
+    height: 4px;
+    background: var(--border);
+    border-radius: 2px;
+    outline: none;
+    cursor: pointer;
+  }
+  .scan-settings-wrap input[type=range]::-webkit-slider-thumb {
+    -webkit-appearance: none;
+    width: 13px; height: 13px;
+    border-radius: 50%;
+    background: var(--accent);
+    cursor: pointer;
+  }
+  .scan-settings-wrap .setting-val {
+    min-width: 22px;
+    color: var(--text);
+    font-weight: 600;
+  }
+  .scan-settings-sep {
+    width: 1px; height: 16px;
+    background: var(--border);
+    margin: 0 4px;
+  }
+
   .btn {
     display: flex;
     align-items: center;
@@ -424,6 +462,16 @@ var Xr=function(e){if(!(this instanceof Xr))return new Xr(e);this.id="Thenable/1
       </select>
     </div>
 
+    <div class="scan-settings-wrap">
+      <span>Sessions</span>
+      <input type="range" id="workersSlider" min="1" max="10" value="5" oninput="document.getElementById('workersVal').textContent=this.value">
+      <span class="setting-val" id="workersVal">5</span>
+      <div class="scan-settings-sep"></div>
+      <span>Login delay</span>
+      <input type="range" id="delaySlider" min="0" max="15" value="3" oninput="document.getElementById('delayVal').textContent=this.value+'s'">
+      <span class="setting-val" id="delayVal">3s</span>
+    </div>
+
     <button class="btn btn-primary" id="scanBtn" onclick="triggerScan()">
       <svg width="14" height="14" fill="none" stroke="currentColor" stroke-width="2.5" viewBox="0 0 24 24">
         <path d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/>
@@ -810,16 +858,31 @@ async function clearAndRescan() {
   if (!confirm('This will delete all switch and link data, then run a full scan. Continue?')) return;
   const btn = document.getElementById('clearScanBtn');
   btn.disabled = true;
-  const res = await fetch('/api/scan/clear', { method: 'POST' });
+  const res = await fetch('/api/scan/clear', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(scanSettings()),
+  });
   if (res.status === 409) { alert('Scan already running'); btn.disabled = false; return; }
   startPolling();
 }
 
+function scanSettings() {
+  return {
+    workers:     parseInt(document.getElementById('workersSlider').value),
+    login_delay: parseInt(document.getElementById('delaySlider').value),
+  };
+}
+
 async function triggerScan(dept) {
   const url = dept === 'elec' ? '/api/scan/elec'
             : dept === 'gw'   ? '/api/scan/gw'
             : '/api/scan';
-  const res = await fetch(url, { method: 'POST' });
+  const res = await fetch(url, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(scanSettings()),
+  });
   if (res.status === 409) { alert('Scan already running'); return; }
   startPolling();
 }

scanner.py

@@ -26,7 +26,7 @@ scan_state = {
 }
 
 
-def run_scan(dept: str = None):
+def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
     """
     Full scan: fetch switch IPs from NocoDB → SSH all → parse → store → export.
     dept: None = all active switches, "ELEC" or "GW" = dept-filtered.
@@ -105,7 +105,7 @@ def run_scan(dept: str = None):
                 "error": result.get("error", "Unknown error")
             })
 
-    scan_all_switches(switches, progress_callback=on_progress)
+    scan_all_switches(switches, progress_callback=on_progress, max_workers=workers, login_delay=login_delay)
 
     try:
         merge_duplicate_switches()

ssh_client.py

@@ -2,7 +2,9 @@
 import re
 import logging
 import threading
+import time
 from concurrent.futures import ThreadPoolExecutor, as_completed
+from functools import partial
 from netmiko import ConnectHandler, NetmikoTimeoutException, NetmikoAuthenticationException
 from config import SSH_USERNAME, SSH_PASSWORD, SSH_PORT, SSH_TIMEOUT, DEVICE_TYPE
 from parser import (parse_lldp_neighbors, parse_mgmt_ip_from_interfaces,
@@ -15,7 +17,7 @@ logger = logging.getLogger(__name__)
 _login_lock = threading.Semaphore(1)
 
 
-def connect_and_query(ip):
+def connect_and_query(ip, login_delay=3):
     device = {
         "device_type":        DEVICE_TYPE,
         "host":               ip,
@@ -43,6 +45,8 @@ def connect_and_query(ip):
         with _login_lock:
             conn = ConnectHandler(**device)
             _pt.Transport._preferred_keys = _orig_preferred_keys
+            if login_delay > 0:
+                time.sleep(login_delay)
 
         try:
             hostname = conn.find_prompt().replace('#', '').replace('>', '').strip()
@@ -175,13 +179,14 @@ def _aruba_firmware(version_output):
 
 # ── Scan orchestration ────────────────────────────────────────────────────────
 
-def scan_all_switches(ip_list, progress_callback=None, max_workers=5):
+def scan_all_switches(ip_list, progress_callback=None, max_workers=5, login_delay=3):
     results = []
     total = len(ip_list)
     done  = 0
 
+    _scan = partial(connect_and_query, login_delay=login_delay)
     with ThreadPoolExecutor(max_workers=max_workers) as executor:
-        future_to_ip = {executor.submit(connect_and_query, ip): ip for ip in ip_list}
+        future_to_ip = {executor.submit(_scan, ip): ip for ip in ip_list}
 
         for future in as_completed(future_to_ip):
             ip = future_to_ip[future]
@@ -189,7 +194,7 @@ def scan_all_switches(ip_list, progress_callback=None, max_workers=5):
                 result = future.result()
             except Exception as e:
                 result = {"success": False, "ip": ip, "error": str(e)}
-            import time; time.sleep(2)  # avoid RADIUS lockout
+            time.sleep(2)  # avoid RADIUS lockout between result processing
 
             results.append(result)
             done += 1