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# -*- coding: utf-8 -*-
from __future__ import absolute_import
from io import BytesIO
from thriftpy._compat import CYTHON
from .. import TTransportBase
class TBufferedTransport(TTransportBase):
"""Class that wraps another transport and buffers its I/O.
The implementation uses a (configurable) fixed-size read buffer
but buffers all writes until a flush is performed.
"""
DEFAULT_BUFFER = 4096
def __init__(self, trans, buf_size=DEFAULT_BUFFER):
self._trans = trans
self._wbuf = BytesIO()
self._rbuf = BytesIO(b"")
self._buf_size = buf_size
def is_open(self):
return self._trans.is_open()
def open(self):
return self._trans.open()
def close(self):
return self._trans.close()
def _read(self, sz):
ret = self._rbuf.read(sz)
if len(ret) != 0:
return ret
self._rbuf = BytesIO(self._trans.read(max(sz, self._buf_size)))
return self._rbuf.read(sz)
def write(self, buf):
self._wbuf.write(buf)
def flush(self):
out = self._wbuf.getvalue()
# reset wbuf before write/flush to preserve state on underlying failure
self._wbuf = BytesIO()
self._trans.write(out)
self._trans.flush()
def getvalue(self):
return self._trans.getvalue()
class TBufferedTransportFactory(object):
def get_transport(self, trans):
return TBufferedTransport(trans)
if CYTHON:
from .cybuffered import TCyBufferedTransport, TCyBufferedTransportFactory # noqa
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