def ListMeasurements(self, **unused_args):
"""Handles /measurements REST request."""
# This is very limited and only supports time range and limit
# queries. You might want to extend this to filter by other
# properties, but for the purpose of measurement archiving
# this is all we need.
start_time = self.request.get('start_time')
end_time = self.request.get('end_time')
limit = self.request.get('limit')
query = model.Measurement.all()
if start_time:
dt = util.MicrosecondsSinceEpochToTime(int(start_time))
query.filter('timestamp >=', dt)
if end_time:
dt = util.MicrosecondsSinceEpochToTime(int(end_time))
query.filter('timestamp <', dt)
query.order('timestamp')
if limit:
results = query.fetch(int(limit))
else:
results = query
output = []
for measurement in results:
# Need to catch case where device has been deleted
try:
unused_device_info = measurement.device_properties.device_info
except db.ReferencePropertyResolveError:
logging.exception('Device deleted for measurement %s',
measurement.key().id())
# Skip this measurement
continue
# Need to catch case where task has been deleted
try:
unused_task = measurement.task
except db.ReferencePropertyResolveError:
measurement.task = None
measurement.put()
mdict = util.ConvertToDict(measurement,
timestamps_in_microseconds=True)
# Fill in additional fields
mdict['id'] = str(measurement.key().id())
mdict['parameters'] = measurement.Params()
mdict['values'] = measurement.Values()
if 'task' in mdict and mdict['task'] is not None:
mdict['task']['id'] = str(measurement.GetTaskID())
mdict['task']['parameters'] = measurement.task.Params()
output.append(mdict)
self.response.out.write(json.dumps(output))
def EncodeScheduleAsJson(schedule):
"""Given a list of Tasks, return a JSON string encoding the schedule."""
output = []
for task in schedule:
# Don't send the user, tag, or filter fields with the schedule
output_task = util.ConvertToDict(
task, exclude_fields=['user', 'tag', 'filter','contrib'])
# Need to add the parameters and key fields
output_task['parameters'] = task.Params()
output_task['key'] = str(task.key().id_or_name())
output.append(output_task)
return json.dumps(output)