75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
import io
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from libp2p.crypto.keys import PrivateKey
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from libp2p.io.abc import EncryptedMsgReadWriter
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from libp2p.peer.id import ID
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from libp2p.security.base_session import BaseSession
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class SecureSession(BaseSession):
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buf: io.BytesIO
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low_watermark: int
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high_watermark: int
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def __init__(
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self,
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local_peer: ID,
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local_private_key: PrivateKey,
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remote_peer: ID,
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conn: EncryptedMsgReadWriter,
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is_initiator: bool,
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) -> None:
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super().__init__(local_peer, local_private_key, is_initiator, remote_peer)
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self.conn = conn
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self._reset_internal_buffer()
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def _reset_internal_buffer(self) -> None:
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self.buf = io.BytesIO()
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self.low_watermark = 0
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self.high_watermark = 0
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def _drain(self, n: int) -> bytes:
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if self.low_watermark == self.high_watermark:
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return bytes()
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data = self.buf.getbuffer()[self.low_watermark : self.high_watermark]
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if n is None:
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n = len(data)
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result = data[:n].tobytes()
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self.low_watermark += len(result)
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if self.low_watermark == self.high_watermark:
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del data # free the memoryview so we can free the underlying BytesIO
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self.buf.close()
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self._reset_internal_buffer()
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return result
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def _fill(self, msg: bytes) -> None:
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self.buf.write(msg)
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self.low_watermark = 0
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self.high_watermark = len(msg)
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async def read(self, n: int = None) -> bytes:
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if n == 0:
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return bytes()
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data_from_buffer = self._drain(n)
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if len(data_from_buffer) > 0:
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return data_from_buffer
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msg = await self.conn.read_msg()
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if n < len(msg):
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self._fill(msg)
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return self._drain(n)
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else:
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return msg
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async def write(self, data: bytes) -> None:
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await self.conn.write_msg(data)
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async def close(self) -> None:
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await self.conn.close()
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