class DSN(object):
def __init__(self):
self.log = logging.getLogger(__name__)
self.parser = DSNParser()
self.last_config_update = None
self.status_update_interval = 5 # Seconds
self.config_update_interval = 600 # Seconds
self.data = None
self.update_callback = None # Called per-antenna if the status has changed
self.data_callback = None # Called for every new data update
def update(self):
try:
if self.last_config_update is None or \
self.last_config_update < datetime.now() - timedelta(minutes=self.config_update_interval):
self.sites, self.spacecraft = self.parser.fetch_config()
new_data = self.parser.fetch_data()
except ConnectionError as e:
self.log.warn("Unable to fetch data from DSN: %s" % e)
return
except LxmlError as e:
self.log.warn("Unable to parse data: %s", e)
return
if self.data is not None:
self.compare_data(self.data, new_data)
if self.data_callback:
self.data_callback(self.data, new_data)
self.data = new_data
def compare_data(self, old, new):
if not self.update_callback:
return
for antenna, new_status in new.iteritems():
if antenna not in old:
# Antenna has gone away (oh no)
continue
old_status = old[antenna]
# The "updated" flag doesn't get flipped except for especially significant status
# changes, but we care about them all
updated = new_status['updated'] > old_status['updated']
for signal in ('down_signal', 'up_signal'):
if (len(new_status[signal]) > 0 and len(old_status[signal]) == 0) or \
(len(new_status[signal]) > 0 and
new_status[signal][0]['debug'] != old_status[signal][0]['debug']):
updated = True
if updated:
self.update_callback(antenna, old_status, new_status)
def run(self):
while True:
self.update()
sleep(self.status_update_interval)
class DSN(object):
def __init__(self):
self.log = logging.getLogger(__name__)
self.parser = DSNParser()
self.last_config_update = None
self.status_update_interval = 5 # Seconds
self.config_update_interval = 600 # Seconds
self.data = None
self.update_callback = None # Called per-antenna if the status has changed
self.data_callback = None # Called for every new data update
def update(self):
try:
if self.last_config_update is None or \
self.last_config_update < datetime.now() - timedelta(minutes=self.config_update_interval):
self.sites, self.spacecraft = self.parser.fetch_config()
new_data = self.parser.fetch_data()
except ConnectionError, e:
self.log.warn("Unable to fetch data from DSN: %s" % e)
return
except LxmlError, e:
self.log.warn("Unable to parse data: %s", e)
return