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81 行
3.5 KiB
81 行
3.5 KiB
import uuid
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import struct
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from typing import Dict, Optional, List
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from mlagents_envs.side_channel import SideChannel, IncomingMessage
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from mlagents_envs.exception import UnityEnvironmentException
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from mlagents_envs.logging_util import get_logger
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class SideChannelManager:
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def __init__(self, side_channels=Optional[List[SideChannel]]):
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self._side_channels_dict = self._get_side_channels_dict(side_channels)
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def process_side_channel_message(self, data: bytes) -> None:
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"""
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Separates the data received from Python into individual messages for each
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registered side channel and calls on_message_received on them.
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:param data: The packed message sent by Unity
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"""
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offset = 0
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while offset < len(data):
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try:
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channel_id = uuid.UUID(bytes_le=bytes(data[offset : offset + 16]))
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offset += 16
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message_len, = struct.unpack_from("<i", data, offset)
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offset = offset + 4
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message_data = data[offset : offset + message_len]
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offset = offset + message_len
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except (struct.error, ValueError, IndexError):
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raise UnityEnvironmentException(
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"There was a problem reading a message in a SideChannel. "
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"Please make sure the version of MLAgents in Unity is "
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"compatible with the Python version."
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)
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if len(message_data) != message_len:
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raise UnityEnvironmentException(
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"The message received by the side channel {0} was "
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"unexpectedly short. Make sure your Unity Environment "
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"sending side channel data properly.".format(channel_id)
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)
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if channel_id in self._side_channels_dict:
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incoming_message = IncomingMessage(message_data)
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self._side_channels_dict[channel_id].on_message_received(
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incoming_message
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)
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else:
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get_logger(__name__).warning(
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f"Unknown side channel data received. Channel type: {channel_id}."
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)
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def generate_side_channel_messages(self) -> bytearray:
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"""
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Gathers the messages that the registered side channels will send to Unity
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and combines them into a single message ready to be sent.
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"""
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result = bytearray()
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for channel_id, channel in self._side_channels_dict.items():
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for message in channel.message_queue:
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result += channel_id.bytes_le
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result += struct.pack("<i", len(message))
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result += message
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channel.message_queue = []
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return result
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@staticmethod
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def _get_side_channels_dict(
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side_channels: Optional[List[SideChannel]]
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) -> Dict[uuid.UUID, SideChannel]:
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"""
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Converts a list of side channels into a dictionary of channel_id to SideChannel
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:param side_channels: The list of side channels.
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"""
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side_channels_dict: Dict[uuid.UUID, SideChannel] = {}
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if side_channels is not None:
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for _sc in side_channels:
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if _sc.channel_id in side_channels_dict:
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raise UnityEnvironmentException(
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f"There cannot be two side channels with "
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f"the same channel id {_sc.channel_id}."
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)
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side_channels_dict[_sc.channel_id] = _sc
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return side_channels_dict
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