client-barcode: Turn stdin reading to nonblocking, add autologout after 3 Minutes

client-barcode/freitagskasse.py

@@ -18,6 +18,7 @@ from decimal import Decimal
 import os
 import time
 import urllib2
+import select
 
 from thread import start_new_thread, allocate_lock
 import time
@@ -514,6 +515,7 @@ class Status:
 
 def print_prompt():
 	sys.stdout.write(">>> ")
+	sys.stdout.flush()
 
 
 def handle(line, status):
@@ -561,6 +563,15 @@ def handle(line, status):
 			error_page('FEHLER bei Kommunikation mit Server "%s"' % str(e))
 
 
+def read_line(f, timeout, timeout_func):
+	ready_to_read, _, _ = select.select([f], [], [], timeout)
+	if ready_to_read:
+		return f.readline().rstrip()
+	else:
+		timeout_func()
+		return ''
+
+
 def main():
 	colorama.init()
 	status = Status()
@@ -575,10 +586,7 @@ def main():
 		clear()
 		status.dump()
 		print_prompt()
-		l = sys.stdin.readline()
+		line = read_line(sys.stdin, timeout=3*60.0, timeout_func=status.logout)
-		if not l:
-			break
-		line = l.rstrip()
 		if line:
 			print_display('\x0cBarcode:\n%20s' % line[:20])
 			handle(line, status)