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Added adaptive compression to Buffer class

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This commit is contained in:
Mark Qvist 2023-09-18 00:39:27 +02:00
parent ffcc5560dc
commit 481062fca1
1 changed files with 36 additions and 13 deletions
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49
RNS/Buffer.py
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@ -29,7 +29,7 @@ class StreamDataMessage(MessageBase):
calculcated based on the value of OVERHEAD
"""
def __init__(self, stream_id: int = None, data: bytes = None, eof: bool = False):
def __init__(self, stream_id: int = None, data: bytes = None, eof: bool = False, compressed: bool = False):
"""
This class is used to encapsulate binary stream
data to be sent over a ``Channel``.
@ -42,7 +42,7 @@ class StreamDataMessage(MessageBase):
if stream_id is not None and stream_id > self.STREAM_ID_MAX:
raise ValueError("stream_id must be 0-16383")
self.stream_id = stream_id
self.compressed = False
self.compressed = compressed
self.data = data or bytes()
self.eof = eof
@ -50,13 +50,6 @@ class StreamDataMessage(MessageBase):
if self.stream_id is None:
raise ValueError("stream_id")
compressed_data = bz2.compress(self.data)
saved = len(self.data)-len(compressed_data)
if saved > 0:
self.data = compressed_data
self.compressed = True
header_val = (0x3fff & self.stream_id) | (0x8000 if self.eof else 0x0000) | (0x4000 if self.compressed > 0 else 0x0000)
return bytes(struct.pack(">H", header_val) + (self.data if self.data else bytes()))
@ -133,7 +126,7 @@ class RawChannelReader(RawIOBase, AbstractContextManager):
try:
threading.Thread(target=listener, name="Message Callback", args=[len(self._buffer)], daemon=True).start()
except Exception as ex:
RNS.log("Error calling RawChannelReader(" + str(self._stream_id) + ") callback: " + str(ex))
RNS.log("Error calling RawChannelReader(" + str(self._stream_id) + ") callback: " + str(ex), RNS.LOG_ERROR)
return True
return False
@ -186,6 +179,10 @@ class RawChannelWriter(RawIOBase, AbstractContextManager):
object, see the Python documentation for
``RawIOBase``.
"""
MAX_CHUNK_LEN = 1024*16
COMPRESSION_TRIES = 4
def __init__(self, stream_id: int, channel: Channel):
"""
Create a raw channel writer.
@ -199,10 +196,36 @@ class RawChannelWriter(RawIOBase, AbstractContextManager):
def write(self, __b: bytes) -> int | None:
try:
chunk = bytes(__b[:StreamDataMessage.MAX_DATA_LEN])
message = StreamDataMessage(self._stream_id, chunk, self._eof)
comp_tries = RawChannelWriter.COMPRESSION_TRIES
comp_try = 1
comp_success = False
chunk_len = len(__b)
if chunk_len > RawChannelWriter.MAX_CHUNK_LEN:
chunk_len = RawChannelWriter.MAX_CHUNK_LEN
__b = __b[:RawChannelWriter.MAX_CHUNK_LEN]
chunk_segment = None
while chunk_len > 32 and comp_try < comp_tries:
chunk_segment_length = int(chunk_len/comp_try)
compressed_chunk = bz2.compress(__b[:chunk_segment_length])
compressed_length = len(compressed_chunk)
if compressed_length < StreamDataMessage.MAX_DATA_LEN and compressed_length < chunk_segment_length:
comp_success = True
break
else:
comp_try += 1
if comp_success:
chunk = compressed_chunk
processed_length = chunk_segment_length
else:
chunk = bytes(__b[:StreamDataMessage.MAX_DATA_LEN])
processed_length = len(chunk)
message = StreamDataMessage(self._stream_id, chunk, self._eof, comp_success)
self._channel.send(message)
return len(chunk)
return processed_length
except RNS.Channel.ChannelException as cex:
if cex.type != RNS.Channel.CEType.ME_LINK_NOT_READY:
raise