Add active user session tracking from agent user :0 2026-07-16 15:46

user     pts/0        2026-07-16 15:50 (:0)
user     pts/1        2026-07-16 16:46 (:0)
user     pts/2        2026-07-17 09:05 (:0) to server UI

agent/agent.py

@@ -7,6 +7,7 @@ import getpass
 import json
 import requests
 import logging
+import subprocess
 from pathlib import Path
 
 logging.basicConfig(
@@ -70,6 +71,62 @@ def get_disk_info():
     return disks
 
 
+def get_active_sessions():
+    """Return active user sessions similar to the `who` command.
+
+    Each session is a dict with keys: username, tty, login_time, origin.
+    Falls back to the current process user if `who` is unavailable.
+    """
+    try:
+        result = subprocess.run(
+            ["who", "-u"],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            check=False,
+        )
+        if result.returncode != 0:
+            return []
+        sessions = []
+        for line in result.stdout.strip().splitlines():
+            line = line.strip()
+            if not line:
+                continue
+            parts = line.split()
+            if len(parts) < 5:
+                continue
+            username = parts[0]
+            tty = parts[1]
+            # login time is usually "YYYY-MM-DD HH:MM" (parts[2] and parts[3])
+            login_time = " ".join(parts[2:4]) if len(parts) >= 4 else ""
+            # The last field may be a comment in parentheses, e.g. (192.168.255.50)
+            origin = ""
+            if parts[-1].startswith("(") and parts[-1].endswith(")"):
+                origin = parts[-1][1:-1]
+            sessions.append({
+                "username": username,
+                "tty": tty,
+                "login_time": login_time,
+                "origin": origin,
+            })
+        return sessions
+    except Exception:
+        return []
+
+
+def get_display_username(sessions):
+    """Return a short username representation for the dashboard.
+
+    Single user  -> username
+    Multiple     -> comma-separated usernames
+    No sessions  -> fallback to process user
+    """
+    usernames = [s["username"] for s in sessions if s.get("username")]
+    if not usernames:
+        return getpass.getuser()
+    return ", ".join(dict.fromkeys(usernames))
+
+
 def get_cpu_temp():
     try:
         temps = psutil.sensors_temperatures()
@@ -108,9 +165,11 @@ def get_top_processes(limit=10):
 
 def collect():
     cfg = load_config()
+    sessions = get_active_sessions()
     payload = {
         "hostname": socket.gethostname(),
-        "username": getpass.getuser(),
+        "username": get_display_username(sessions),
+        "sessions": sessions,
         "os_info": f"{platform.system()} {platform.release()}",
         "local_ip": get_local_ip(),
         "public_ip": get_public_ip() if cfg.get("send_public_ip") else None,