roboto.domain.topics.mcap_topic_reader

Module Contents

class roboto.domain.topics.mcap_topic_reader.McapTopicReader(roboto_client, cache_dir)

Bases: roboto.domain.topics.topic_reader.TopicReader

Private interface for retrieving topic data stored in MCAP files.

Note

This is not intended as a public API. To access topic data, prefer the get_data or get_data_as_df methods on Topic, MessagePath, or Event.

Parameters:

• roboto_client (roboto.http.RobotoClient)

• cache_dir (pathlib.Path)

static accepts(message_paths_to_representations)

Parameters:

message_paths_to_representations (collections.abc.Iterable[roboto.domain.topics.operations.MessagePathRepresentationMapping])

Return type:

bool

get_data(message_paths_to_representations, log_time_attr_name, log_time_unit=TimeUnit.Nanoseconds, start_time=None, end_time=None, timestamp_message_path_representation_mapping=None)

Parameters:

• message_paths_to_representations (collections.abc.Iterable[roboto.domain.topics.operations.MessagePathRepresentationMapping])

• log_time_attr_name (str)

• log_time_unit (roboto.time.TimeUnit)

• start_time (Optional[int])

• end_time (Optional[int])

• timestamp_message_path_representation_mapping (Optional[roboto.domain.topics.operations.MessagePathRepresentationMapping])

Return type:

collections.abc.Generator[dict[str, Any], None, None]

get_data_as_df(message_paths_to_representations, log_time_attr_name, log_time_unit=TimeUnit.Nanoseconds, start_time=None, end_time=None, timestamp_message_path_representation_mapping=None)

Parameters:

• message_paths_to_representations (collections.abc.Iterable[roboto.domain.topics.operations.MessagePathRepresentationMapping])

• log_time_attr_name (str)

• log_time_unit (roboto.time.TimeUnit)

• start_time (Optional[int])

• end_time (Optional[int])

• timestamp_message_path_representation_mapping (Optional[roboto.domain.topics.operations.MessagePathRepresentationMapping])

Return type:

pandas.DataFrame

roboto.domain.topics.mcap_topic_reader.OUTFILE_NAME_PATTERN = '{repr_id}_{file_id}.mcap'

roboto.domain.topics.mcap_topic_reader.garbage_collect_old_topic_data(cache_dir, expire_after=datetime.timedelta(days=7))

Parameters:

• cache_dir (pathlib.Path)

• expire_after (datetime.timedelta)

roboto.domain.topics.mcap_topic_reader.logger