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"""Socket file object."""
from __future__ import absolute_import, division, print_function
__metaclass__ = type
import socket
try:
# prefer slower Python-based io module
import _pyio as io
except ImportError:
# Python 2.6
import io
import six
from . import errors
from ._compat import extract_bytes, memoryview
# 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 MakeFile_PY2(getattr(socket, '_fileobject', object)):
"""Faux file object attached to a socket object."""
def __init__(self, *args, **kwargs):
"""Initialize faux file object."""
self.bytes_read = 0
self.bytes_written = 0
socket._fileobject.__init__(self, *args, **kwargs)
self._refcount = 0
def _reuse(self):
self._refcount += 1
def _drop(self):
if self._refcount < 0:
self.close()
else:
self._refcount -= 1
def write(self, data):
"""Sendall for non-blocking sockets."""
bytes_sent = 0
data_mv = memoryview(data)
payload_size = len(data_mv)
while bytes_sent < payload_size:
try:
bytes_sent += self.send(
data_mv[bytes_sent:bytes_sent + SOCK_WRITE_BLOCKSIZE]
)
except socket.error as e:
if e.args[0] not in errors.socket_errors_nonblocking:
raise
def send(self, data):
"""Send some part of message to the socket."""
bytes_sent = self._sock.send(extract_bytes(data))
self.bytes_written += bytes_sent
return bytes_sent
def flush(self):
"""Write all data from buffer to socket and reset write buffer."""
if self._wbuf:
buffer = ''.join(self._wbuf)
self._wbuf = []
self.write(buffer)
def recv(self, size):
"""Receive message of a size from the socket."""
while True:
try:
data = self._sock.recv(size)
self.bytes_read += len(data)
return data
except socket.error as e:
what = (
e.args[0] not in errors.socket_errors_nonblocking
and e.args[0] not in errors.socket_error_eintr
)
if what:
raise
class FauxSocket:
"""Faux socket with the minimal interface required by pypy."""
def _reuse(self):
pass
_fileobject_uses_str_type = six.PY2 and isinstance(
socket._fileobject(FauxSocket())._rbuf, six.string_types)
# FauxSocket is no longer needed
del FauxSocket
if not _fileobject_uses_str_type:
def read(self, size=-1):
"""Read data from the socket to buffer."""
# Use max, disallow tiny reads in a loop as they are very
# inefficient.
# We never leave read() with any leftover data from a new recv()
# call in our internal buffer.
rbufsize = max(self._rbufsize, self.default_bufsize)
# Our use of StringIO rather than lists of string objects returned
# by recv() minimizes memory usage and fragmentation that occurs
# when rbufsize is large compared to the typical return value of
# recv().
buf = self._rbuf
buf.seek(0, 2) # seek end
if size < 0:
# Read until EOF
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(rbufsize)
if not data:
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or EOF seen, whichever comes first
buf_len = buf.tell()
if buf_len >= size:
# Already have size bytes in our buffer? Extract and
# return.
buf.seek(0)
rv = buf.read(size)
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return rv
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
left = size - buf_len
# recv() will malloc the amount of memory given as its
# parameter even though it often returns much less data
# than that. The returned data string is short lived
# as we copy it into a StringIO and free it. This avoids
# fragmentation issues on many platforms.
data = self.recv(left)
if not data:
break
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid buffer data copies when:
# - We have no data in our buffer.
# AND
# - Our call to recv returned exactly the
# number of bytes we were asked to read.
return data
if n == left:
buf.write(data)
del data # explicit free
break
assert n <= left, 'recv(%d) returned %d bytes' % (left, n)
buf.write(data)
buf_len += n
del data # explicit free
# assert buf_len == buf.tell()
return buf.getvalue()
def readline(self, size=-1):
"""Read line from the socket to buffer."""
buf = self._rbuf
buf.seek(0, 2) # seek end
if buf.tell() > 0:
# check if we already have it in our buffer
buf.seek(0)
bline = buf.readline(size)
if bline.endswith('\n') or len(bline) == size:
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return bline
del bline
if size < 0:
# Read until \n or EOF, whichever comes first
if self._rbufsize <= 1:
# Speed up unbuffered case
buf.seek(0)
buffers = [buf.read()]
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
data = None
recv = self.recv
while data != '\n':
data = recv(1)
if not data:
break
buffers.append(data)
return ''.join(buffers)
buf.seek(0, 2) # seek end
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(self._rbufsize)
if not data:
break
nl = data.find('\n')
if nl >= 0:
nl += 1
buf.write(data[:nl])
self._rbuf.write(data[nl:])
del data
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or \n or EOF seen, whichever comes
# first
buf.seek(0, 2) # seek end
buf_len = buf.tell()
if buf_len >= size:
buf.seek(0)
rv = buf.read(size)
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return rv
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(self._rbufsize)
if not data:
break
left = size - buf_len
# did we just receive a newline?
nl = data.find('\n', 0, left)
if nl >= 0:
nl += 1
# save the excess data to _rbuf
self._rbuf.write(data[nl:])
if buf_len:
buf.write(data[:nl])
break
else:
# Shortcut. Avoid data copy through buf when
# returning a substring of our first recv().
return data[:nl]
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid data copy through buf when
# returning exactly all of our first recv().
return data
if n >= left:
buf.write(data[:left])
self._rbuf.write(data[left:])
break
buf.write(data)
buf_len += n
# assert buf_len == buf.tell()
return buf.getvalue()
else:
def read(self, size=-1):
"""Read data from the socket to buffer."""
if size < 0:
# Read until EOF
buffers = [self._rbuf]
self._rbuf = ''
if self._rbufsize <= 1:
recv_size = self.default_bufsize
else:
recv_size = self._rbufsize
while True:
data = self.recv(recv_size)
if not data:
break
buffers.append(data)
return ''.join(buffers)
else:
# Read until size bytes or EOF seen, whichever comes first
data = self._rbuf
buf_len = len(data)
if buf_len >= size:
self._rbuf = data[size:]
return data[:size]
buffers = []
if data:
buffers.append(data)
self._rbuf = ''
while True:
left = size - buf_len
recv_size = max(self._rbufsize, left)
data = self.recv(recv_size)
if not data:
break
buffers.append(data)
n = len(data)
if n >= left:
self._rbuf = data[left:]
buffers[-1] = data[:left]
break
buf_len += n
return ''.join(buffers)
def readline(self, size=-1):
"""Read line from the socket to buffer."""
data = self._rbuf
if size < 0:
# Read until \n or EOF, whichever comes first
if self._rbufsize <= 1:
# Speed up unbuffered case
assert data == ''
buffers = []
while data != '\n':
data = self.recv(1)
if not data:
break
buffers.append(data)
return ''.join(buffers)
nl = data.find('\n')
if nl >= 0:
nl += 1
self._rbuf = data[nl:]
return data[:nl]
buffers = []
if data:
buffers.append(data)
self._rbuf = ''
while True:
data = self.recv(self._rbufsize)
if not data:
break
buffers.append(data)
nl = data.find('\n')
if nl >= 0:
nl += 1
self._rbuf = data[nl:]
buffers[-1] = data[:nl]
break
return ''.join(buffers)
else:
# Read until size bytes or \n or EOF seen, whichever comes
# first
nl = data.find('\n', 0, size)
if nl >= 0:
nl += 1
self._rbuf = data[nl:]
return data[:nl]
buf_len = len(data)
if buf_len >= size:
self._rbuf = data[size:]
return data[:size]
buffers = []
if data:
buffers.append(data)
self._rbuf = ''
while True:
data = self.recv(self._rbufsize)
if not data:
break
buffers.append(data)
left = size - buf_len
nl = data.find('\n', 0, left)
if nl >= 0:
nl += 1
self._rbuf = data[nl:]
buffers[-1] = data[:nl]
break
n = len(data)
if n >= left:
self._rbuf = data[left:]
buffers[-1] = data[:left]
break
buf_len += n
return ''.join(buffers)
if six.PY3:
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)
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)
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)
else:
StreamReader = StreamWriter = MakeFile = MakeFile_PY2
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