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| from typing import List | |
| import struct | |
| from mlagents_envs.logging_util import get_logger | |
| logger = get_logger(__name__) | |
| class OutgoingMessage: | |
| """ | |
| Utility class for forming the message that is written to a SideChannel. | |
| All data is written in little-endian format using the struct module. | |
| """ | |
| def __init__(self): | |
| """ | |
| Create an OutgoingMessage with an empty buffer. | |
| """ | |
| self.buffer = bytearray() | |
| def write_bool(self, b: bool) -> None: | |
| """ | |
| Append a boolean value. | |
| """ | |
| self.buffer += struct.pack("<?", b) | |
| def write_int32(self, i: int) -> None: | |
| """ | |
| Append an integer value. | |
| """ | |
| self.buffer += struct.pack("<i", i) | |
| def write_float32(self, f: float) -> None: | |
| """ | |
| Append a float value. It will be truncated to 32-bit precision. | |
| """ | |
| self.buffer += struct.pack("<f", f) | |
| def write_float32_list(self, float_list: List[float]) -> None: | |
| """ | |
| Append a list of float values. They will be truncated to 32-bit precision. | |
| """ | |
| self.write_int32(len(float_list)) | |
| for f in float_list: | |
| self.write_float32(f) | |
| def write_string(self, s: str) -> None: | |
| """ | |
| Append a string value. Internally, it will be encoded to ascii, and the | |
| encoded length will also be written to the message. | |
| """ | |
| encoded_key = s.encode("ascii") | |
| self.write_int32(len(encoded_key)) | |
| self.buffer += encoded_key | |
| def set_raw_bytes(self, buffer: bytearray) -> None: | |
| """ | |
| Set the internal buffer to a new bytearray. This will overwrite any existing data. | |
| :param buffer: | |
| :return: | |
| """ | |
| if self.buffer: | |
| logger.warning( | |
| "Called set_raw_bytes but the message already has been written to. This will overwrite data." | |
| ) | |
| self.buffer = bytearray(buffer) | |