src: add user session detection implementation

Detect user login and logout for Linux and Windows.

Report an active interactive session through the /refresh response
so a new ogserver instance can update the session status.

Poll the session change in 5 second intervals in a thread. Use the
same event socket previously used by the old session detection
mechanism to notify a session change.

Use the method check_interactive_session_change in each
ogOperations.py to report the session status.
Return values:
	None: no session changes are found
	True: login
	False: logout

Windows
Verify if psutil.users() has any value.

Linux
Verify all the psutil.users() asociated to a terminal.

1 files changed, 19 insertions, 1 deletions

diff --git a/src/windows/ogOperations.py b/src/windows/ogOperations.py
index bdb2a39..23e962c 100644
--- a/src/windows/ogOperations.py
+++ b/src/windows/ogOperations.py
@@ -8,6 +8,7 @@
 
 import os
 import ctypes
+import psutil
 import subprocess
 from subprocess import CalledProcessError
 import multiprocessing as mp
@@ -64,6 +65,7 @@ def create_systray():
 class OgWindowsOperations:
 
     def __init__(self):
+        self.session = False
         freeze_support()
         mp.set_start_method('spawn')
         self.systray_p = Process(target=create_systray, daemon=True)
@@ -122,4 +124,20 @@ class OgWindowsOperations:
         raise OgError('Function not implemented')
 
     def refresh(self, ogRest):
-        return {"status": "WIN"}
+        if self.session:
+            session_value = 'WINS'
+        else:
+            session_value = 'WIN'
+        return {"status": session_value}
+
+    def check_interactive_session_change(self):
+        old_status = self.session
+        has_logged_user = False
+        for user in psutil.users():
+            has_logged_user = True
+            break
+        self.session = has_logged_user
+
+        if self.session != old_status:
+            return self.session
+        return None