diff options
| -rw-r--r-- | glucometerutils/drivers/fslibre.py | 156 |
1 files changed, 137 insertions, 19 deletions
diff --git a/glucometerutils/drivers/fslibre.py b/glucometerutils/drivers/fslibre.py index c213ccd..d24d514 100644 --- a/glucometerutils/drivers/fslibre.py +++ b/glucometerutils/drivers/fslibre.py @@ -11,19 +11,139 @@ import datetime from glucometerutils import common from glucometerutils.support import freestyle -# Fields of the records returned by $history? +# Fields of the records returned by both $history and $arresult? # Tuple of pairs of idx and field name -_HISTORY_ENTRY_MAP = ( +_BASE_ENTRY_MAP = ( + (1, 'type'), (2, 'month'), (3, 'day'), (4, 'year'), # 2-digits (5, 'hour'), (6, 'minute'), (7, 'second'), +) + +# Fields of the records returned by $history? +_HISTORY_ENTRY_MAP = _BASE_ENTRY_MAP + ( (13, 'value'), (15, 'errors'), ) +# Fields of the results returned by $arresult? where type = 2 +_ARRESULT_TYPE2_ENTRY_MAP = ( + (9, 'reading-type'), # 0 = sensor, 2 = glucose + (12, 'value'), + (15, 'sport-flag'), + (16, 'medication-flag'), + (17, 'rapid-acting-flag'), # see _ARRESULT_RAPID_INSULIN_ENTRY_MAP + (18, 'long-acting-flag'), + (19, 'custom-comments-bitfield'), + (23, 'double-long-acting-insulin'), + (25, 'food-flag'), + (26, 'food-carbs-grams'), + (28, 'errors'), +) + +# Fields only valid when rapid-acting-flag is "1" +_ARRESULT_RAPID_INSULIN_ENTRY_MAP = ( + (43, 'double-rapid-acting-insulin'), +) + + +def _parse_record(record, entry_map): + """Parses a list of string fields into a dictionary of integers.""" + + if not record: + return {} + + return { + key: int(record[idx]) + for idx, key in entry_map + } + + +def _extract_timestamp(parsed_record): + """Extract the timestamp from a parsed record. + + This leverages the fact that all the records have the same base structure. + """ + + return datetime.datetime( + parsed_record['year'] + 2000, + parsed_record['month'], + parsed_record['day'], + parsed_record['hour'], + parsed_record['minute'], + parsed_record['second']) + + +def _parse_arresult(record): + """Takes an array of string fields as input and parses it into a Reading.""" + + parsed_record = _parse_record(record, _BASE_ENTRY_MAP) + + # There are other record types, but we don't currently need to expose these. + if not parsed_record or parsed_record['type'] != 2: + return None + + parsed_record.update(_parse_record(record, _ARRESULT_TYPE2_ENTRY_MAP)) + + # Check right away if we have rapid insulin + if parsed_record['rapid-acting-flag']: + parsed_record.update( + _parse_record(record, _ARRESULT_RAPID_INSULIN_ENTRY_MAP)) + + if parsed_record['errors']: + return None + + comment_parts = [] + + if parsed_record['reading-type'] == 2: + comment_parts.append('(Scan)') + elif parsed_record['reading-type'] == 0: + comment_parts.append('(Blood)') + else: + # ketone reading + return None + + custom_comments = record[29:35] + for comment_index in range(6): + if parsed_record['custom-comments-bitfield'] & (1 << comment_index): + comment_parts.append(custom_comments[comment_index][1:-1]) + + if parsed_record['sport-flag']: + comment_parts.append('Sport') + + if parsed_record['medication-flag']: + comment_parts.append('Medication') + + if parsed_record['food-flag']: + if parsed_record['food-carbs-grams']: + comment_parts.append( + 'Food (%d g)' % parsed_record['food-carbs-grams']) + else: + comment_parts.append('Food') + + if parsed_record['long-acting-flag']: + if parsed_record['double-long-acting-insulin']: + comment_parts.append( + 'Long-acting insulin (%d)' % + (parsed_record['double-long-acting-insulin']/2)) + else: + comment_parts.append('Long-acting insulin') + + if parsed_record['rapid-acting-flag']: + if parsed_record['double-rapid-acting-insulin']: + comment_parts.append( + 'Rapid-acting insulin (%d)' % + (parsed_record['double-rapid-acting-insulin']/2)) + else: + comment_parts.append('Rapid-acting insulin') + + return common.Reading( + _extract_timestamp(parsed_record), + parsed_record['value'], + comment='; '.join(comment_parts)) class Device(freestyle.FreeStyleHidDevice): """Glucometer driver for FreeStyle Libre devices.""" @@ -48,26 +168,24 @@ class Device(freestyle.FreeStyleHidDevice): return common.UNIT_MGDL def get_readings(self): - for record in self._get_multirecord(b'$history?'): - if not record: - continue - parsed_record = { - key: int(record[idx]) - for idx, key in _HISTORY_ENTRY_MAP - } + # First of all get the usually longer list of sensor readings, and + # convert them to Readings objects. + for record in self._get_multirecord(b'$history?'): + parsed_record = _parse_record(record, _HISTORY_ENTRY_MAP) - if parsed_record['errors'] != 0: + if not parsed_record or parsed_record['errors'] != 0: # The reading is considered invalid, so ignore it. continue - timestamp = datetime.datetime( - parsed_record['year'] + 2000, - parsed_record['month'], - parsed_record['day'], - parsed_record['hour'], - parsed_record['minute'], - parsed_record['second']) + yield common.Reading( + _extract_timestamp(parsed_record), + parsed_record['value'], + comment='(Sensor)') - yield common.Reading(timestamp, parsed_record['value'], - comment='(Sensor)') + # Then get the results of explicit scans and blood tests (and other + # events). + for record in self._get_multirecord(b'$arresult?'): + reading = _parse_arresult(record) + if reading: + yield reading |