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de3369f2ca
Have SocketIO objects update their reference count in the underlying socket object on close() so that the underlying socket object is closed immediately when the last user is done rather than at an unknown later time when garbage collection can do it.
308 lines
9.6 KiB
Python
308 lines
9.6 KiB
Python
# Wrapper module for _socket, providing some additional facilities
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# implemented in Python.
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"""\
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This module provides socket operations and some related functions.
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On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
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On other systems, it only supports IP. Functions specific for a
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socket are available as methods of the socket object.
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Functions:
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socket() -- create a new socket object
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socketpair() -- create a pair of new socket objects [*]
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fromfd() -- create a socket object from an open file descriptor [*]
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gethostname() -- return the current hostname
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gethostbyname() -- map a hostname to its IP number
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gethostbyaddr() -- map an IP number or hostname to DNS info
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getservbyname() -- map a service name and a protocol name to a port number
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getprotobyname() -- mape a protocol name (e.g. 'tcp') to a number
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ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
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htons(), htonl() -- convert 16, 32 bit int from host to network byte order
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inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
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inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
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socket.getdefaulttimeout() -- get the default timeout value
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socket.setdefaulttimeout() -- set the default timeout value
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create_connection() -- connects to an address, with an optional timeout
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[*] not available on all platforms!
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Special objects:
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SocketType -- type object for socket objects
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error -- exception raised for I/O errors
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has_ipv6 -- boolean value indicating if IPv6 is supported
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Integer constants:
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AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
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SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)
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Many other constants may be defined; these may be used in calls to
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the setsockopt() and getsockopt() methods.
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"""
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import _socket
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from _socket import *
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import os, sys, io
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try:
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from errno import EBADF
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except ImportError:
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EBADF = 9
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__all__ = ["getfqdn"]
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__all__.extend(os._get_exports_list(_socket))
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_realsocket = socket
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# WSA error codes
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if sys.platform.lower().startswith("win"):
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errorTab = {}
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errorTab[10004] = "The operation was interrupted."
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errorTab[10009] = "A bad file handle was passed."
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errorTab[10013] = "Permission denied."
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errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
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errorTab[10022] = "An invalid operation was attempted."
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errorTab[10035] = "The socket operation would block"
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errorTab[10036] = "A blocking operation is already in progress."
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errorTab[10048] = "The network address is in use."
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errorTab[10054] = "The connection has been reset."
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errorTab[10058] = "The network has been shut down."
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errorTab[10060] = "The operation timed out."
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errorTab[10061] = "Connection refused."
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errorTab[10063] = "The name is too long."
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errorTab[10064] = "The host is down."
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errorTab[10065] = "The host is unreachable."
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__all__.append("errorTab")
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class socket(_socket.socket):
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"""A subclass of _socket.socket adding the makefile() method."""
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__slots__ = ["__weakref__", "_io_refs", "_closed"]
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def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
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_socket.socket.__init__(self, family, type, proto, fileno)
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self._io_refs = 0
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self._closed = False
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def __repr__(self):
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"""Wrap __repr__() to reveal the real class name."""
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s = _socket.socket.__repr__(self)
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if s.startswith("<socket object"):
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s = "<%s.%s%s%s" % (self.__class__.__module__,
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self.__class__.__name__,
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(self._closed and " [closed] ") or "",
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s[7:])
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return s
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def dup(self):
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"""dup() -> socket object
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Return a new socket object connected to the same system resource.
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"""
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fd = dup(self.fileno())
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sock = self.__class__(self.family, self.type, self.proto, fileno=fd)
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sock.settimeout(self.gettimeout())
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return sock
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def accept(self):
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"""accept() -> (socket object, address info)
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Wait for an incoming connection. Return a new socket
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representing the connection, and the address of the client.
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For IP sockets, the address info is a pair (hostaddr, port).
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"""
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fd, addr = self._accept()
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return socket(self.family, self.type, self.proto, fileno=fd), addr
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def makefile(self, mode="r", buffering=None, *,
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encoding=None, newline=None):
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"""makefile(...) -> an I/O stream connected to the socket
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The arguments are as for io.open() after the filename,
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except the only mode characters supported are 'r', 'w' and 'b'.
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The semantics are similar too. (XXX refactor to share code?)
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"""
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for c in mode:
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if c not in {"r", "w", "b"}:
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raise ValueError("invalid mode %r (only r, w, b allowed)")
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writing = "w" in mode
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reading = "r" in mode or not writing
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assert reading or writing
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binary = "b" in mode
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rawmode = ""
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if reading:
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rawmode += "r"
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if writing:
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rawmode += "w"
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raw = SocketIO(self, rawmode)
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self._io_refs += 1
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if buffering is None:
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buffering = -1
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if buffering < 0:
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buffering = io.DEFAULT_BUFFER_SIZE
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if buffering == 0:
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if not binary:
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raise ValueError("unbuffered streams must be binary")
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return raw
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if reading and writing:
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buffer = io.BufferedRWPair(raw, raw, buffering)
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elif reading:
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buffer = io.BufferedReader(raw, buffering)
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else:
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assert writing
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buffer = io.BufferedWriter(raw, buffering)
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if binary:
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return buffer
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text = io.TextIOWrapper(buffer, encoding, newline)
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text.mode = mode
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return text
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def _decref_socketios(self):
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if self._io_refs > 0:
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self._io_refs -= 1
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if self._closed:
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self.close()
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def _real_close(self):
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_socket.socket.close(self)
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def close(self):
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self._closed = True
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if self._io_refs <= 0:
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self._real_close()
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def fromfd(fd, family, type, proto=0):
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""" fromfd(fd, family, type[, proto]) -> socket object
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Create a socket object from a duplicate of the given file
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descriptor. The remaining arguments are the same as for socket().
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"""
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nfd = dup(fd)
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return socket(family, type, proto, nfd)
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class SocketIO(io.RawIOBase):
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"""Raw I/O implementation for stream sockets.
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This class supports the makefile() method on sockets. It provides
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the raw I/O interface on top of a socket object.
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"""
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# XXX More docs
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def __init__(self, sock, mode):
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if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
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raise ValueError("invalid mode: %r" % mode)
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io.RawIOBase.__init__(self)
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self._sock = sock
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if "b" not in mode:
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mode += "b"
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self._mode = mode
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self._reading = "r" in mode
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self._writing = "w" in mode
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def readinto(self, b):
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self._checkClosed()
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self._checkReadable()
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return self._sock.recv_into(b)
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def write(self, b):
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self._checkClosed()
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self._checkWritable()
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return self._sock.send(b)
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def readable(self):
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return self._reading and not self.closed
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def writable(self):
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return self._writing and not self.closed
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def fileno(self):
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self._checkClosed()
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return self._sock.fileno()
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@property
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def name(self):
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return self.fileno()
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@property
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def mode(self):
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return self._mode
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def close(self):
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if self.closed:
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return
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io.RawIOBase.close(self)
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self._sock._decref_socketios()
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self._sock = None
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def __del__(self):
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if not self.closed:
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self._sock._decref_socketios()
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def getfqdn(name=''):
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"""Get fully qualified domain name from name.
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An empty argument is interpreted as meaning the local host.
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First the hostname returned by gethostbyaddr() is checked, then
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possibly existing aliases. In case no FQDN is available, hostname
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from gethostname() is returned.
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"""
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name = name.strip()
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if not name or name == '0.0.0.0':
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name = gethostname()
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try:
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hostname, aliases, ipaddrs = gethostbyaddr(name)
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except error:
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pass
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else:
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aliases.insert(0, hostname)
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for name in aliases:
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if '.' in name:
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break
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else:
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name = hostname
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return name
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_GLOBAL_DEFAULT_TIMEOUT = object()
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def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT):
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"""Connect to *address* and return the socket object.
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Convenience function. Connect to *address* (a 2-tuple ``(host,
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port)``) and return the socket object. Passing the optional
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*timeout* parameter will set the timeout on the socket instance
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before attempting to connect. If no *timeout* is supplied, the
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global default timeout setting returned by :func:`getdefaulttimeout`
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is used.
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"""
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msg = "getaddrinfo returns an empty list"
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host, port = address
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for res in getaddrinfo(host, port, 0, SOCK_STREAM):
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af, socktype, proto, canonname, sa = res
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sock = None
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try:
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sock = socket(af, socktype, proto)
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if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
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sock.settimeout(timeout)
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sock.connect(sa)
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return sock
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except error as err:
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msg = err
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if sock is not None:
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sock.close()
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raise error(msg)
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