388 lines
14 KiB
Python
388 lines
14 KiB
Python
"""Socket file object."""
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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import socket
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try:
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# prefer slower Python-based io module
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import _pyio as io
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except ImportError:
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# Python 2.6
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import io
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import six
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from . import errors
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class BufferedWriter(io.BufferedWriter):
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"""Faux file object attached to a socket object."""
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def write(self, b):
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"""Write bytes to buffer."""
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self._checkClosed()
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if isinstance(b, str):
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raise TypeError("can't write str to binary stream")
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with self._write_lock:
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self._write_buf.extend(b)
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self._flush_unlocked()
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return len(b)
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def _flush_unlocked(self):
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self._checkClosed('flush of closed file')
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while self._write_buf:
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try:
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# ssl sockets only except 'bytes', not bytearrays
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# so perhaps we should conditionally wrap this for perf?
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n = self.raw.write(bytes(self._write_buf))
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except io.BlockingIOError as e:
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n = e.characters_written
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del self._write_buf[:n]
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def MakeFile_PY3(sock, mode='r', bufsize=io.DEFAULT_BUFFER_SIZE):
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"""File object attached to a socket object."""
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if 'r' in mode:
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return io.BufferedReader(socket.SocketIO(sock, mode), bufsize)
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else:
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return BufferedWriter(socket.SocketIO(sock, mode), bufsize)
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class MakeFile_PY2(getattr(socket, '_fileobject', object)):
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"""Faux file object attached to a socket object."""
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def __init__(self, *args, **kwargs):
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"""Initialize faux file object."""
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self.bytes_read = 0
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self.bytes_written = 0
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socket._fileobject.__init__(self, *args, **kwargs)
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def write(self, data):
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"""Sendall for non-blocking sockets."""
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while data:
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try:
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bytes_sent = self.send(data)
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data = data[bytes_sent:]
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except socket.error as e:
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if e.args[0] not in errors.socket_errors_nonblocking:
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raise
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def send(self, data):
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"""Send some part of message to the socket."""
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bytes_sent = self._sock.send(data)
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self.bytes_written += bytes_sent
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return bytes_sent
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def flush(self):
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"""Write all data from buffer to socket and reset write buffer."""
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if self._wbuf:
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buffer = ''.join(self._wbuf)
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self._wbuf = []
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self.write(buffer)
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def recv(self, size):
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"""Receive message of a size from the socket."""
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while True:
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try:
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data = self._sock.recv(size)
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self.bytes_read += len(data)
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return data
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except socket.error as e:
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what = (
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e.args[0] not in errors.socket_errors_nonblocking
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and e.args[0] not in errors.socket_error_eintr
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)
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if what:
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raise
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class FauxSocket:
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"""Faux socket with the minimal interface required by pypy."""
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def _reuse(self):
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pass
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_fileobject_uses_str_type = six.PY2 and isinstance(
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socket._fileobject(FauxSocket())._rbuf, six.string_types)
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# FauxSocket is no longer needed
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del FauxSocket
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if not _fileobject_uses_str_type:
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def read(self, size=-1):
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"""Read data from the socket to buffer."""
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# Use max, disallow tiny reads in a loop as they are very
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# inefficient.
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# We never leave read() with any leftover data from a new recv()
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# call in our internal buffer.
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rbufsize = max(self._rbufsize, self.default_bufsize)
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# Our use of StringIO rather than lists of string objects returned
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# by recv() minimizes memory usage and fragmentation that occurs
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# when rbufsize is large compared to the typical return value of
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# recv().
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buf = self._rbuf
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buf.seek(0, 2) # seek end
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if size < 0:
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# Read until EOF
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# reset _rbuf. we consume it via buf.
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self._rbuf = io.BytesIO()
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while True:
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data = self.recv(rbufsize)
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if not data:
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break
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buf.write(data)
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return buf.getvalue()
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else:
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# Read until size bytes or EOF seen, whichever comes first
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buf_len = buf.tell()
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if buf_len >= size:
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# Already have size bytes in our buffer? Extract and
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# return.
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buf.seek(0)
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rv = buf.read(size)
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self._rbuf = io.BytesIO()
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self._rbuf.write(buf.read())
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return rv
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# reset _rbuf. we consume it via buf.
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self._rbuf = io.BytesIO()
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while True:
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left = size - buf_len
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# recv() will malloc the amount of memory given as its
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# parameter even though it often returns much less data
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# than that. The returned data string is short lived
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# as we copy it into a StringIO and free it. This avoids
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# fragmentation issues on many platforms.
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data = self.recv(left)
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if not data:
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break
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n = len(data)
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if n == size and not buf_len:
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# Shortcut. Avoid buffer data copies when:
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# - We have no data in our buffer.
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# AND
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# - Our call to recv returned exactly the
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# number of bytes we were asked to read.
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return data
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if n == left:
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buf.write(data)
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del data # explicit free
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break
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assert n <= left, 'recv(%d) returned %d bytes' % (left, n)
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buf.write(data)
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buf_len += n
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del data # explicit free
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# assert buf_len == buf.tell()
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return buf.getvalue()
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def readline(self, size=-1):
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"""Read line from the socket to buffer."""
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buf = self._rbuf
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buf.seek(0, 2) # seek end
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if buf.tell() > 0:
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# check if we already have it in our buffer
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buf.seek(0)
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bline = buf.readline(size)
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if bline.endswith('\n') or len(bline) == size:
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self._rbuf = io.BytesIO()
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self._rbuf.write(buf.read())
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return bline
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del bline
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if size < 0:
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# Read until \n or EOF, whichever comes first
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if self._rbufsize <= 1:
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# Speed up unbuffered case
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buf.seek(0)
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buffers = [buf.read()]
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# reset _rbuf. we consume it via buf.
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self._rbuf = io.BytesIO()
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data = None
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recv = self.recv
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while data != '\n':
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data = recv(1)
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if not data:
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break
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buffers.append(data)
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return ''.join(buffers)
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buf.seek(0, 2) # seek end
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# reset _rbuf. we consume it via buf.
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self._rbuf = io.BytesIO()
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while True:
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data = self.recv(self._rbufsize)
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if not data:
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break
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nl = data.find('\n')
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if nl >= 0:
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nl += 1
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buf.write(data[:nl])
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self._rbuf.write(data[nl:])
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del data
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break
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buf.write(data)
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return buf.getvalue()
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else:
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# Read until size bytes or \n or EOF seen, whichever comes
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# first
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buf.seek(0, 2) # seek end
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buf_len = buf.tell()
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if buf_len >= size:
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buf.seek(0)
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rv = buf.read(size)
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self._rbuf = io.BytesIO()
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self._rbuf.write(buf.read())
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return rv
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# reset _rbuf. we consume it via buf.
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self._rbuf = io.BytesIO()
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while True:
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data = self.recv(self._rbufsize)
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if not data:
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break
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left = size - buf_len
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# did we just receive a newline?
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nl = data.find('\n', 0, left)
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if nl >= 0:
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nl += 1
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# save the excess data to _rbuf
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self._rbuf.write(data[nl:])
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if buf_len:
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buf.write(data[:nl])
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break
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else:
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# Shortcut. Avoid data copy through buf when
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# returning a substring of our first recv().
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return data[:nl]
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n = len(data)
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if n == size and not buf_len:
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# Shortcut. Avoid data copy through buf when
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# returning exactly all of our first recv().
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return data
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if n >= left:
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buf.write(data[:left])
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self._rbuf.write(data[left:])
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break
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buf.write(data)
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buf_len += n
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# assert buf_len == buf.tell()
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return buf.getvalue()
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else:
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def read(self, size=-1):
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"""Read data from the socket to buffer."""
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if size < 0:
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# Read until EOF
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buffers = [self._rbuf]
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self._rbuf = ''
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if self._rbufsize <= 1:
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recv_size = self.default_bufsize
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else:
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recv_size = self._rbufsize
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while True:
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data = self.recv(recv_size)
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if not data:
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break
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buffers.append(data)
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return ''.join(buffers)
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else:
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# Read until size bytes or EOF seen, whichever comes first
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data = self._rbuf
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buf_len = len(data)
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if buf_len >= size:
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self._rbuf = data[size:]
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return data[:size]
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buffers = []
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if data:
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buffers.append(data)
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self._rbuf = ''
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while True:
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left = size - buf_len
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recv_size = max(self._rbufsize, left)
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data = self.recv(recv_size)
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if not data:
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break
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buffers.append(data)
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n = len(data)
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if n >= left:
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self._rbuf = data[left:]
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buffers[-1] = data[:left]
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break
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buf_len += n
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return ''.join(buffers)
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def readline(self, size=-1):
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"""Read line from the socket to buffer."""
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data = self._rbuf
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if size < 0:
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# Read until \n or EOF, whichever comes first
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if self._rbufsize <= 1:
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# Speed up unbuffered case
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assert data == ''
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buffers = []
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while data != '\n':
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data = self.recv(1)
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if not data:
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break
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buffers.append(data)
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return ''.join(buffers)
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nl = data.find('\n')
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if nl >= 0:
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nl += 1
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self._rbuf = data[nl:]
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return data[:nl]
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buffers = []
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if data:
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buffers.append(data)
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self._rbuf = ''
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while True:
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data = self.recv(self._rbufsize)
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if not data:
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break
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buffers.append(data)
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nl = data.find('\n')
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if nl >= 0:
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nl += 1
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self._rbuf = data[nl:]
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buffers[-1] = data[:nl]
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break
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return ''.join(buffers)
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else:
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# Read until size bytes or \n or EOF seen, whichever comes
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# first
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nl = data.find('\n', 0, size)
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if nl >= 0:
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nl += 1
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self._rbuf = data[nl:]
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return data[:nl]
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buf_len = len(data)
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if buf_len >= size:
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self._rbuf = data[size:]
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return data[:size]
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buffers = []
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if data:
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buffers.append(data)
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self._rbuf = ''
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while True:
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data = self.recv(self._rbufsize)
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if not data:
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break
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buffers.append(data)
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left = size - buf_len
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nl = data.find('\n', 0, left)
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if nl >= 0:
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nl += 1
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self._rbuf = data[nl:]
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buffers[-1] = data[:nl]
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break
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n = len(data)
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if n >= left:
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self._rbuf = data[left:]
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buffers[-1] = data[:left]
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break
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buf_len += n
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return ''.join(buffers)
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MakeFile = MakeFile_PY2 if six.PY2 else MakeFile_PY3
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