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from mlagents_envs.side_channel import SideChannel, IncomingMessage, OutgoingMessage
import uuid
from typing import Dict, Optional, List
class FloatPropertiesChannel(SideChannel):
"""
This is the SideChannel for float properties shared with Unity.
You can modify the float properties of an environment with the commands
set_property, get_property and list_properties.
"""
def __init__(self, channel_id: uuid.UUID = None) -> None:
self._float_properties: Dict[str, float] = {}
if channel_id is None:
channel_id = uuid.UUID("60ccf7d0-4f7e-11ea-b238-784f4387d1f7")
super().__init__(channel_id)
def on_message_received(self, msg: IncomingMessage) -> None:
"""
Is called by the environment to the side channel. Can be called
multiple times per step if multiple messages are meant for that
SideChannel.
"""
k = msg.read_string()
v = msg.read_float32()
self._float_properties[k] = v
def set_property(self, key: str, value: float) -> None:
"""
Sets a property in the Unity Environment.
:param key: The string identifier of the property.
:param value: The float value of the property.
"""
self._float_properties[key] = value
msg = OutgoingMessage()
msg.write_string(key)
msg.write_float32(value)
super().queue_message_to_send(msg)
def get_property(self, key: str) -> Optional[float]:
"""
Gets a property in the Unity Environment. If the property was not
found, will return None.
:param key: The string identifier of the property.
:return: The float value of the property or None.
"""
return self._float_properties.get(key)
def list_properties(self) -> List[str]:
"""
Returns a list of all the string identifiers of the properties
currently present in the Unity Environment.
"""
return list(self._float_properties.keys())
def get_property_dict_copy(self) -> Dict[str, float]:
"""
Returns a copy of the float properties.
:return:
"""
return dict(self._float_properties)
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