def update_session_timeout():
"""Updates timeout for valid sessions and updates last modification
time for existing files related to the session"""
pm = ProcessManager.get_instance()
if 'id' in session:
lock = pm.get_lock(session['id'])
if lock:
with lock:
return update()
return update()
def get_output():
pm = ProcessManager.get_instance()
if not sessions.check_session():
sessions.delete_output_file()
return {"text": '\nSession timed-out'}, 404
elif not 'id' in session or not pm.process_exists(session['id']):
sessions.delete_output_file()
return {"text": ''}, 404
else:
if pm.is_alive(session['id']):
with open(session['output']) as out:
out.seek(session['position'])
result = out.read(4096)
session['position'] = out.tell()
return {"text": result}, 206
else:
with open(session['output']) as out:
out.seek(session['position'])
result = out.read()
os.remove(session['output'])
queue = pm.get_queue(session['id'])
payload = {}
payload['text'] = result
graph = graphviz.Graph.from_file(session['model'])
payload['edges'], payload['nodes'] = graph.get_graph_number()
payload['mts'] = graph.get_mts()
if (queue):
tmp = queue.get()['ambiguities']
session['ambiguities'] = tmp
payload['ambiguities'] = tmp
ProcessManager.get_instance().delete_queue(session['id'])
try:
dis = Disambiguator.from_file(session['model'])
dis.highlight_ambiguities(tmp['dead'], tmp['false'],
tmp['hidden'])
payload['graph'] = dis.get_graph()
graphviz.Graph(dis.get_graph()).draw_graph(
session['graph'])
return payload, 200
except:
return payload, 200
return payload, 200
def check_session():
"""Check if the current session is still valid by verifying if the
timeout value is still bigger than the current time."""
pm = ProcessManager.get_instance()
if 'id' in session:
lock = pm.get_lock(session['id'])
if lock:
with lock:
return ('timeout' in session and session['timeout'] is not None
and session['timeout'] > time.time())
else:
return ('timeout' in session and session['timeout'] is not None
and session['timeout'] > time.time())
def close_session():
"""Closes a session by deleting all of its related files and by freeing
the related session dictionary."""
pm = ProcessManager.get_instance()
session.pop('timeout', None)
session.pop('position', None)
if 'id' in session and session['id']:
pm.end_process(session['id'])
pm.delete_lock(session['id'])
delete_output_file(True)
session.pop('id', None)
session.pop('output', None)
session.pop('ambiguities', None)
session.pop('graph', None)
session.pop('counter_graph', None)
session.pop('model', None)
def run_vmc():
pm = ProcessManager.get_instance()
if not session['ambiguities']:
queue = pm.get_queue(session['id'])
if not queue:
raise VmcException(
"No ambiguities data available execute a full analysis first")
else:
session['ambiguities'] = queue.get()
if (len(session['ambiguities']['hidden']) != 0):
raise VmcException(
"Hidden deadlocks detected. It is necessary to remove them before checking the property"
)
folder = session['output'].split('-output')[0]
model = os.path.join(folder, 'model.txt')
properties = os.path.join(folder, 'properties.txt')
try:
if sys.platform.startswith('linux'):
vmc = VmcController(app.config['VMC_LINUX'])
elif sys.platform.startswith('win'):
vmc = VmcController(app.config['VMC_WINDOWS'])
elif sys.platform.startswith('cygwin'):
vmc = VmcController(app.config['VMC_WINDOWS'])
elif sys.platform.startswith('darwin'):
vmc = VmcController(app.config['VMC_MAC'])
else:
raise VmcException(
"VMC is not compatible with your operating system")
vmc.run_vmc(model, properties)
except ValueError as ve:
err = str(ve).strip()
if os.path.isdir(folder):
shutil.rmtree(folder)
if err == 'Invalid vmc_path':
raise VmcException("Unable to locate VMC executable")
if err == 'Invalid model file':
raise VmcException('Invalid model file')
if err == 'Invalid properties file':
raise VmcException('Invalid properties file')
except:
shutil.rmtree(folder)
raise VmcException('An error occured')
shutil.rmtree(folder)
return vmc
def translate_model():
pm = ProcessManager.get_instance()
if not session['ambiguities']:
queue = pm.get_queue(session['id'])
if not queue:
raise VmcException(
"No ambiguities data available execute a full analysis first")
else:
session['ambiguities'] = queue.get()
if (len(session['ambiguities']['hidden']) != 0):
raise VmcException(
"Hidden deadlocks detected. It is necessary to remove them before checking the property"
)
fpath = session['model']
actl_property = request.form['property']
if (len(actl_property) == 0):
raise VmcException('Missing property to be verified')
if os.path.isfile(fpath):
translator = Translator()
translator.load_model(fpath)
translator.translate()
folder = session['output'].split('-output')[0]
try:
os.mkdir(folder)
except FileExistsError:
#if the directory is already present continue
pass
model = os.path.join(folder, 'model.txt')
properties = os.path.join(folder, 'properties.txt')
with open(model, "w") as mts:
mts.write(translator.get_output())
mts.flush()
with open(properties, "w") as prop_file:
prop_file.write(actl_property)
prop_file.flush()
else:
raise VmcException('Unable to translate, FTS model not found.')
