def process_probe_sync(probe_sync):
""" Processes a probe sync request.
"""
probe_id = probe_sync.probe_id
# Persist information about the probe and this sync
update_probe_status(probe_id, probe_sync.sync_count)
# Persist any sensor data
persist_sensor_data(probe_id, probe_sync.sensor_data)
# Persist any actuator history
# TODO...
# Build response. Note that curr_time will be off by remaining
# control server processing, one way latency and probe processing.
now = date_util.get_current_timestamp()
response = {
"probe_id" : probe_sync.probe_id,
"curr_time" : now
}
return response
def record_sensor_data(sensor_id, value):
data_point = {
"id" : sensor_id,
"timestamp" : date_util.get_current_timestamp(),
"value" : value
}
if verbose:
print json.dumps(data_point, indent=1)
sensor_data.append(data_point)
def send_probe_sync_request():
global sync_count
url = "http://%s:%d/probe_sync" %\
(control_server_hostname, control_server_port)
print " **********************************************************"
print " > Sending probe sync request to: %s with token [%s]" % (url, token)
request_content = {
"probe_id" : probe_id,
"token" : token,
"connection_attempts" : 1,
"sensor_freq" : sensor_freq,
"sync_freq" : sync_freq,
"sync_count" : sync_count,
"curr_time" : date_util.get_current_timestamp(),
"sensor_data" : sensor_data
}
# Print Request
print "---- Request ----"
print json.dumps(request_content, indent=1)
request = urllib2.Request(url)
request.add_header('Content-Type', 'application/json')
response = urllib2.urlopen(request, json.dumps(request_content))
response_content_str = response.read()
response_content = json.loads(response_content_str)
# Clear sensor data
del sensor_data[:]
sync_count += 1
# Print Response
print ""
print "---- Response ----"
print "%s" % response_content_str
print ""
if verbose:
print ">>>>>>>>>>>>>>>>>>>>>>>>>>>>> probe_sync"
print request
print request.json
print "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
# Validate probe sync request token
if not probe_sync.token == token:
print "[WARN] Connection attempt by probe '%s' from %s with invalid token." %\
(probe_sync.probe_id, request.remote_addr)
abort(401)
# Compare probe's time with Control Server time. Log if the
# difference is significant. If the probe's current time is 0,
# that indicates that time hasn't yet been set on the probe.
time_diff = date_util.get_current_timestamp() - probe_sync.curr_time
if probe_sync.curr_time > 0 and math.fabs(time_diff) > time_diff_threshold:
print "[WARN] Probe time is off by %ds" % time_diff
# If the probe tried to connect to the Control Server more than
# once, then log the the failed connection attemps
if probe_sync.connection_attempts > 1:
print "[WARN] Probe '%s' attemped to connect %d times" %\
(probe_sync.probe_id, probe_sync.connection_attempts)
response = probe_service.process_probe_sync(probe_sync)
if verbose:
print response
print "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
