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"""Socket file object."""
import socket
# prefer slower Python-based io module
import _pyio as io
# Write only 16K at a time to sockets
SOCK_WRITE_BLOCKSIZE = 16384
class BufferedWriter(io.BufferedWriter):
"""Faux file object attached to a socket object."""
def write(self, b):
"""Write bytes to buffer."""
self._checkClosed()
if isinstance(b, str):
raise TypeError("can't write str to binary stream")
with self._write_lock:
self._write_buf.extend(b)
self._flush_unlocked()
return len(b)
def _flush_unlocked(self):
self._checkClosed('flush of closed file')
while self._write_buf:
try:
# ssl sockets only except 'bytes', not bytearrays
# so perhaps we should conditionally wrap this for perf?
n = self.raw.write(bytes(self._write_buf))
except io.BlockingIOError as e:
n = e.characters_written
del self._write_buf[:n]
class StreamReader(io.BufferedReader):
"""Socket stream reader."""
def __init__(self, sock, mode='r', bufsize=io.DEFAULT_BUFFER_SIZE):
"""Initialize socket stream reader."""
super().__init__(socket.SocketIO(sock, mode), bufsize)
self.bytes_read = 0
def read(self, *args, **kwargs):
"""Capture bytes read."""
val = super().read(*args, **kwargs)
self.bytes_read += len(val)
return val
def has_data(self):
"""Return true if there is buffered data to read."""
return len(self._read_buf) > self._read_pos
class StreamWriter(BufferedWriter):
"""Socket stream writer."""
def __init__(self, sock, mode='w', bufsize=io.DEFAULT_BUFFER_SIZE):
"""Initialize socket stream writer."""
super().__init__(socket.SocketIO(sock, mode), bufsize)
self.bytes_written = 0
def write(self, val, *args, **kwargs):
"""Capture bytes written."""
res = super().write(val, *args, **kwargs)
self.bytes_written += len(val)
return res
def MakeFile(sock, mode='r', bufsize=io.DEFAULT_BUFFER_SIZE):
"""File object attached to a socket object."""
cls = StreamReader if 'r' in mode else StreamWriter
return cls(sock, mode, bufsize)
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