1 # Copyright 2015 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import cherrypy 6 7 import common 8 import logging 9 from fake_device_server import server_errors 10 11 FAIL_CONTROL_PATH = 'fail_control' 12 13 class FailControl(object): 14 """Interface used to control failing of requests.""" 15 16 # Needed for cherrypy to expose this to requests. 17 exposed = True 18 19 def __init__(self): 20 self._in_failure_mode = False 21 22 def ensure_not_in_failure_mode(self): 23 """Ensures we're not in failure mode. 24 25 If instructed to fail, this method raises an HTTPError 26 exception with code 500 (Internal Server Error). Otherwise 27 does nothing. 28 29 """ 30 if not self._in_failure_mode: 31 return 32 raise server_errors.HTTPError(500, 'Instructed to fail this request') 33 34 @cherrypy.tools.json_out() 35 def POST(self, *args, **kwargs): 36 """Handle POST messages.""" 37 path = list(args) 38 if path == ['start_failing_requests']: 39 self._in_failure_mode = True 40 logging.info('Requested to start failing all requests.') 41 return dict() 42 elif path == ['stop_failing_requests']: 43 self._in_failure_mode = False 44 logging.info('Requested to stop failing all requests.') 45 return dict() 46 else: 47 raise server_errors.HTTPError( 48 400, 'Unsupported fail_control path %s' % path) 49
