store: add top list maintainer daemon

miscellaneous/store-server/TopList.py

+import os, os.path
+from pyinotify import WatchManager, Notifier, ThreadedNotifier, EventsCodes, ProcessEvent, IN_DONT_FOLLOW, IN_CREATE, IN_MODIFY
+import pwd
+
+COUNT=5
+
+wm = WatchManager()
+mask = IN_CREATE | IN_MODIFY | IN_DONT_FOLLOW
+
+def update_new(name):
+    home = pwd.getpwuid(os.stat(name).st_uid).pw_dir
+    top_dir = os.path.join(home, "../.top")
+    try:
+        os.mkdir(top_dir)
+    except OSError:
+        pass
+    try:
+        os.unlink(os.path.join(top_dir, str(COUNT)))
+    except OSError:
+        pass
+    for i in range(1, COUNT):
+        try:
+            os.rename(os.path.join(top_dir, str(i+1)), os.path.join(top_dir, str(i)))
+        except OSError:
+            pass
+    os.symlink(name, os.path.join(top_dir, str(COUNT)))
+
+class Process(ProcessEvent):
+    def process_default(self, event):
+        if event.name:
+            update_new(os.path.join(event.path, event.name))
+
+def main():
+    notifier = Notifier(wm, Process())
+    wdd = wm.add_watch('/home', mask, rec=True)
+    while True:  # loop forever
+        try:
+            # process the queue of events as explained above
+            notifier.process_events()
+            if notifier.check_events():
+                # read notified events and enqeue them
+                notifier.read_events()
+        except KeyboardInterrupt:
+            # destroy the inotify's instance on this interrupt (stop monitoring)
+            notifier.stop()
+            break
+
+if __name__ == "__main__":
+        main()