def _parse_header(self):
"""
Parse the start time of the profile and the sensor
"""
# read the first bytes from the file
header = self._stream_handle.read(HEADER_BYTES)
match = WFP_E_COASTAL_FLAGS_HEADER_MATCHER.match(header)
# parse the header
if match is not None:
# use the profile start time as the timestamp
fields = struct.unpack('>II', match.group(2))
timestamp = int(fields[1])
self._timestamp = float(ntplib.system_to_ntp_time(timestamp))
log.debug(self._start_data_particle_class)
sample = self._extract_sample(self._start_data_particle_class,
None,
header, self._timestamp)
if sample:
# create particle
self._increment_state(HEADER_BYTES)
log.debug("Extracting header %s with read_state: %s", sample, self._read_state)
self._saved_header = (sample, copy.copy(self._read_state))
else:
raise SampleException("File header does not match header regex")
def _build_parsed_values(self):
"""
Take something in the data format and turn it into
a particle with the appropriate tag.
@throws SampleException If there is a problem with sample creation
"""
match = WFP_E_COASTAL_FLAGS_HEADER_MATCHER.match(self.raw_data)
if not match:
raise SampleException(
"WfpEngStcImodemStartDataParticle: No regex match of parsed sample data: [%s]",
self.raw_data)
try:
fields = struct.unpack('>II', match.group(2))
sensor_start = int(fields[0])
profile_start = int(fields[1])
log.debug('Unpacked sensor start %d, profile start %d', sensor_start, profile_start)
except (ValueError, TypeError, IndexError) as ex:
raise SampleException("Error (%s) while decoding parameters in data: [%s]"
% (ex, match.group(0)))
result = [self._encode_value(WfpEngStcImodemStartDataParticleKey.SENSOR_START, sensor_start, int),
self._encode_value(WfpEngStcImodemStartDataParticleKey.PROFILE_START, profile_start, int)]
log.debug('WfpEngStcImodemStartDataParticle: particle=%s', result)
return result
