Data Buffer

Client for the data-buffer service.

This allows client code to log the following to the robot’s data buffer: text-messages, operator comments, blobs, signal ticks, and protobuf messages.

exception bosdyn.client.data_buffer.InvalidArgument

Bases: Error

A given argument could not be used.

bosdyn.client.data_buffer.log_event(robot, event_type, level, description, start_timestamp_secs, end_timestamp_secs=None, id_str=None, parameters=None, log_preserve_hint=1)

Add an Event to the Data Buffer.

Parameters

• robot – A Robot object.

• event_type (string) – The type of event.

• level (bosdyn.api.Event.Level) – The relative importance of the event.

• description (string) – A human-readable description of the event.

• start_timestamp_secs (float) – Start of the event, in local time.

• end_timestamp_secs (float) – End of the event. start_timestamp_secs is used if None.

• id_str (string) – Unique id for event. A uuid is generated if None.

• parameters ([bosdyn.api.Parameter]) – Parameters to attach to the event.

• log_preserve_hint (bosdyn.api.LogPreserveHint) – Whether event should try to preserve log data.

bosdyn.client.data_buffer.make_parameter(label, value, units='', notes='')

Create a parameter proto from a label and the parameter value.

class bosdyn.client.data_buffer.DataBufferClient

Bases: BaseClient

A client for adding to robot data buffer.

default_service_name = 'data-buffer'

service_type = 'bosdyn.api.DataBufferService'

update_from(other)

Adopt key objects like processors, logger, and wallet from other.

add_text_messages(text_messages, **kwargs)

Log text messages to the robot.

Parameters

text_messages (List[TextMessage]) – Sequence of TextMessage protos.

Raises

RpcError – Problem communicating with the robot.

add_text_messages_async(text_messages, **kwargs)

Async version of add_text_messages.

add_operator_comment(msg, robot_timestamp=None, **kwargs)

Add an operator comment to the robot log.

Parameters

• msg (string) – Text of user comment to log.

• robot_timestamp (google.protobuf.Timestamp) – Time of messages, in robot time. If not set, timestamp will be when the robot receives the message.

Raises

RpcError – Problem communicating with the robot.

add_operator_comment_async(msg, robot_timestamp=None, **kwargs)

Async version of add_operator_comment.

add_blob(data, type_id, channel=None, robot_timestamp=None, write_sync=False, **kwargs)

Log blob messages to the data buffer.

Parameters

• data (bytes) – Binary data of one blob.

• type_id (string) – Type of binary data of blob. For example, this could be the full name of a protobuf message type.

• channel (string) – The name by which messages are typically queried: often the same as type_id, or of the form ‘{prefix}/{type_id}’.

• robot_timestamp (google.protobuf.Timestamp) – Time of messages, in robot time.

Raises

RpcError – Problem communicating with the robot.

add_blob_async(data, type_id, channel=None, robot_timestamp=None, write_sync=False, **kwargs)

Async version of add_blob.

add_protobuf(proto, channel=None, robot_timestamp=None, write_sync=False)

Log protobuf messages to the data buffer.

Parameters

• proto (Protobuf message) – Serializable protobuf to log.

• channel (string) – Name of channel for data. If not set defaults to proto type name.

• robot_timestamp (google.protobuf.Timestamp) – Time of proto, in robot time.

Raises

RpcError – Problem communicating with the robot.

add_protobuf_async(proto, channel=None, robot_timestamp=None, write_sync=False)

Async version of add_protobuf.

add_events(events, **kwargs)

Log event messages to the robot.

Parameters

events (List[Event]) – Sequence of Event protos.

Raises

RpcError – Problem communicating with the robot.

add_events_async(events, **kwargs)

Async version of add_events.

register_signal_schema(variables, schema_name, **kwargs)

Log signal schema to the robot.

Parameters

• variables (List[SignalSchema.Variable]) – List of SignalSchema variables defining what is in tick.

• schema_name (string) – Name of schema (defined previously by client).

Raises

RpcError – Problem communicating with the robot.

register_signal_schema_async(variables, schema_name, **kwargs)

Async version of register_signal_schema

add_signal_tick(data, schema_id, encoding=1, sequence_id=0, source='client', **kwargs)

Log signal data to the robot data buffer.

Schema should be sent before any ticks.

Parameters

• data (bytes) – Single hunk of binary data.

• schema_id (int) – ID name of schema (obtained from a previous schema registration)

• encoding (SignalTick.Encoding) – Encoding of the data

• sequence_id (int) – Index of which sequence tick this is

• source (string) – String name representing client

Raises

• RpcError – Problem communicating with the robot.

• LookupError – The schema_id is unknown (not previously registered by this client)

add_signal_tick_async(data, schema_id, encoding=1, sequence_id=0, source='client', **kwargs)

Async version of add_signal_tick.

now_in_robot_basis(msg_type=None, proto=None)

Get current time in robot clock basis if possible, None otherwise.

class bosdyn.client.data_buffer.LoggingHandler(service, data_buffer_client, level=0, time_sync_endpoint=None, rpc_timeout=1, msg_num_limit=10, msg_age_limit=1)

Bases: Handler

A logging system Handler that will publish text to a the data-buffer service.

Parameters

• service – Name of the service. See LogAnnotationTextMessage.

• data_buffer_client – API client that will send log messages.

• level – Python logging level. Defaults to NOTSET.

• time_sync_endpoint – A TimeSyncEndpoint, already synchronized to the remote clock.

• rpc_timeout – Timeout on RPCs made by data_buffer_client.

• msg_num_limit – If number of messages reaches this number, send data with data_buffer_client.

• msg_age_limit – If messages have been sitting locally for this many seconds, send data with data_buffer_client.

Raises

log_annotation.InvalidArgument – The TimeSyncEndpoint is not valid.

emit(record)

Do whatever it takes to actually log the specified logging record.

This version is intended to be implemented by subclasses and so raises a NotImplementedError.

flush()

Ensure all logging output has been flushed.

This version does nothing and is intended to be implemented by subclasses.

close()

Tidy up any resources used by the handler.

This version removes the handler from an internal map of handlers, _handlers, which is used for handler lookup by name. Subclasses should ensure that this gets called from overridden close() methods.

is_thread_alive()

Return true if send-thread is running.

restart(data_buffer_client)

Restart the send thread.

Raises

AssertionError if send thread is still alive. –

static fallback_log(msg)

Handle log messages that were failed to be sent by printing to the console.

record_to_msg(record)

Convert logging record to TextMessage proto.

static record_level_to_proto_level(record_level)

Convert logging record level to TextMessage proto level.