Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/future/backports/socket.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 # Wrapper module for _socket, providing some additional facilities
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2 # implemented in Python.
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3
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4 """\
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5 This module provides socket operations and some related functions.
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6 On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
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7 On other systems, it only supports IP. Functions specific for a
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8 socket are available as methods of the socket object.
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9
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10 Functions:
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11
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12 socket() -- create a new socket object
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13 socketpair() -- create a pair of new socket objects [*]
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14 fromfd() -- create a socket object from an open file descriptor [*]
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15 fromshare() -- create a socket object from data received from socket.share() [*]
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16 gethostname() -- return the current hostname
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17 gethostbyname() -- map a hostname to its IP number
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18 gethostbyaddr() -- map an IP number or hostname to DNS info
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19 getservbyname() -- map a service name and a protocol name to a port number
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20 getprotobyname() -- map a protocol name (e.g. 'tcp') to a number
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21 ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
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22 htons(), htonl() -- convert 16, 32 bit int from host to network byte order
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23 inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
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24 inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
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25 socket.getdefaulttimeout() -- get the default timeout value
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26 socket.setdefaulttimeout() -- set the default timeout value
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27 create_connection() -- connects to an address, with an optional timeout and
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28 optional source address.
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29
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30 [*] not available on all platforms!
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31
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32 Special objects:
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33
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34 SocketType -- type object for socket objects
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35 error -- exception raised for I/O errors
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36 has_ipv6 -- boolean value indicating if IPv6 is supported
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37
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38 Integer constants:
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39
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40 AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
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41 SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)
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42
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43 Many other constants may be defined; these may be used in calls to
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44 the setsockopt() and getsockopt() methods.
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45 """
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46
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47 from __future__ import unicode_literals
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48 from __future__ import print_function
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49 from __future__ import division
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50 from __future__ import absolute_import
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51 from future.builtins import super
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52
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53 import _socket
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54 from _socket import *
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55
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56 import os, sys, io
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57
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58 try:
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59 import errno
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60 except ImportError:
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61 errno = None
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62 EBADF = getattr(errno, 'EBADF', 9)
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63 EAGAIN = getattr(errno, 'EAGAIN', 11)
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64 EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11)
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65
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66 __all__ = ["getfqdn", "create_connection"]
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67 __all__.extend(os._get_exports_list(_socket))
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68
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69
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70 _realsocket = socket
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71
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72 # WSA error codes
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73 if sys.platform.lower().startswith("win"):
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74 errorTab = {}
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75 errorTab[10004] = "The operation was interrupted."
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76 errorTab[10009] = "A bad file handle was passed."
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77 errorTab[10013] = "Permission denied."
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78 errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
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79 errorTab[10022] = "An invalid operation was attempted."
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80 errorTab[10035] = "The socket operation would block"
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81 errorTab[10036] = "A blocking operation is already in progress."
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82 errorTab[10048] = "The network address is in use."
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83 errorTab[10054] = "The connection has been reset."
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84 errorTab[10058] = "The network has been shut down."
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85 errorTab[10060] = "The operation timed out."
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86 errorTab[10061] = "Connection refused."
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87 errorTab[10063] = "The name is too long."
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88 errorTab[10064] = "The host is down."
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89 errorTab[10065] = "The host is unreachable."
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90 __all__.append("errorTab")
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91
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92
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93 class socket(_socket.socket):
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94
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95 """A subclass of _socket.socket adding the makefile() method."""
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96
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97 __slots__ = ["__weakref__", "_io_refs", "_closed"]
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98
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99 def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
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100 if fileno is None:
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101 _socket.socket.__init__(self, family, type, proto)
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102 else:
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103 _socket.socket.__init__(self, family, type, proto, fileno)
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104 self._io_refs = 0
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105 self._closed = False
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106
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107 def __enter__(self):
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108 return self
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109
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110 def __exit__(self, *args):
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111 if not self._closed:
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112 self.close()
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113
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114 def __repr__(self):
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115 """Wrap __repr__() to reveal the real class name."""
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116 s = _socket.socket.__repr__(self)
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117 if s.startswith("<socket object"):
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118 s = "<%s.%s%s%s" % (self.__class__.__module__,
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119 self.__class__.__name__,
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120 getattr(self, '_closed', False) and " [closed] " or "",
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121 s[7:])
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122 return s
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123
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124 def __getstate__(self):
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125 raise TypeError("Cannot serialize socket object")
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126
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127 def dup(self):
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128 """dup() -> socket object
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129
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130 Return a new socket object connected to the same system resource.
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131 """
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132 fd = dup(self.fileno())
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133 sock = self.__class__(self.family, self.type, self.proto, fileno=fd)
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134 sock.settimeout(self.gettimeout())
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135 return sock
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136
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137 def accept(self):
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138 """accept() -> (socket object, address info)
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139
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140 Wait for an incoming connection. Return a new socket
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141 representing the connection, and the address of the client.
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142 For IP sockets, the address info is a pair (hostaddr, port).
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143 """
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144 fd, addr = self._accept()
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145 sock = socket(self.family, self.type, self.proto, fileno=fd)
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146 # Issue #7995: if no default timeout is set and the listening
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147 # socket had a (non-zero) timeout, force the new socket in blocking
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148 # mode to override platform-specific socket flags inheritance.
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149 if getdefaulttimeout() is None and self.gettimeout():
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150 sock.setblocking(True)
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151 return sock, addr
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152
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153 def makefile(self, mode="r", buffering=None, **_3to2kwargs):
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154 """makefile(...) -> an I/O stream connected to the socket
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155
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156 The arguments are as for io.open() after the filename,
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157 except the only mode characters supported are 'r', 'w' and 'b'.
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158 The semantics are similar too. (XXX refactor to share code?)
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159 """
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160 if 'newline' in _3to2kwargs: newline = _3to2kwargs['newline']; del _3to2kwargs['newline']
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161 else: newline = None
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162 if 'errors' in _3to2kwargs: errors = _3to2kwargs['errors']; del _3to2kwargs['errors']
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163 else: errors = None
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164 if 'encoding' in _3to2kwargs: encoding = _3to2kwargs['encoding']; del _3to2kwargs['encoding']
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165 else: encoding = None
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166 for c in mode:
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167 if c not in ("r", "w", "b"):
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168 raise ValueError("invalid mode %r (only r, w, b allowed)")
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169 writing = "w" in mode
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170 reading = "r" in mode or not writing
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171 assert reading or writing
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172 binary = "b" in mode
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173 rawmode = ""
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174 if reading:
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175 rawmode += "r"
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176 if writing:
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177 rawmode += "w"
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178 raw = SocketIO(self, rawmode)
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179 self._io_refs += 1
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180 if buffering is None:
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181 buffering = -1
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182 if buffering < 0:
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183 buffering = io.DEFAULT_BUFFER_SIZE
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184 if buffering == 0:
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185 if not binary:
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186 raise ValueError("unbuffered streams must be binary")
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187 return raw
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188 if reading and writing:
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189 buffer = io.BufferedRWPair(raw, raw, buffering)
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190 elif reading:
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191 buffer = io.BufferedReader(raw, buffering)
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192 else:
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193 assert writing
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194 buffer = io.BufferedWriter(raw, buffering)
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195 if binary:
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196 return buffer
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197 text = io.TextIOWrapper(buffer, encoding, errors, newline)
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198 text.mode = mode
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199 return text
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200
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201 def _decref_socketios(self):
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202 if self._io_refs > 0:
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203 self._io_refs -= 1
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204 if self._closed:
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205 self.close()
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206
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207 def _real_close(self, _ss=_socket.socket):
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208 # This function should not reference any globals. See issue #808164.
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209 _ss.close(self)
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210
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211 def close(self):
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212 # This function should not reference any globals. See issue #808164.
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213 self._closed = True
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214 if self._io_refs <= 0:
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215 self._real_close()
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216
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217 def detach(self):
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218 """detach() -> file descriptor
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219
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220 Close the socket object without closing the underlying file descriptor.
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221 The object cannot be used after this call, but the file descriptor
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222 can be reused for other purposes. The file descriptor is returned.
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223 """
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224 self._closed = True
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225 return super().detach()
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226
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227 def fromfd(fd, family, type, proto=0):
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228 """ fromfd(fd, family, type[, proto]) -> socket object
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229
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230 Create a socket object from a duplicate of the given file
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231 descriptor. The remaining arguments are the same as for socket().
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232 """
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233 nfd = dup(fd)
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234 return socket(family, type, proto, nfd)
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235
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236 if hasattr(_socket.socket, "share"):
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237 def fromshare(info):
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238 """ fromshare(info) -> socket object
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239
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240 Create a socket object from a the bytes object returned by
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241 socket.share(pid).
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242 """
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243 return socket(0, 0, 0, info)
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244
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245 if hasattr(_socket, "socketpair"):
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246
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247 def socketpair(family=None, type=SOCK_STREAM, proto=0):
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248 """socketpair([family[, type[, proto]]]) -> (socket object, socket object)
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249
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250 Create a pair of socket objects from the sockets returned by the platform
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251 socketpair() function.
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252 The arguments are the same as for socket() except the default family is
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253 AF_UNIX if defined on the platform; otherwise, the default is AF_INET.
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254 """
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255 if family is None:
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256 try:
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257 family = AF_UNIX
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258 except NameError:
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259 family = AF_INET
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260 a, b = _socket.socketpair(family, type, proto)
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261 a = socket(family, type, proto, a.detach())
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262 b = socket(family, type, proto, b.detach())
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263 return a, b
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264
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265
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266 _blocking_errnos = set([EAGAIN, EWOULDBLOCK])
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267
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268 class SocketIO(io.RawIOBase):
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269
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270 """Raw I/O implementation for stream sockets.
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271
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272 This class supports the makefile() method on sockets. It provides
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273 the raw I/O interface on top of a socket object.
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274 """
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275
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276 # One might wonder why not let FileIO do the job instead. There are two
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277 # main reasons why FileIO is not adapted:
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278 # - it wouldn't work under Windows (where you can't used read() and
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279 # write() on a socket handle)
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280 # - it wouldn't work with socket timeouts (FileIO would ignore the
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281 # timeout and consider the socket non-blocking)
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282
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283 # XXX More docs
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284
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285 def __init__(self, sock, mode):
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286 if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
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287 raise ValueError("invalid mode: %r" % mode)
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288 io.RawIOBase.__init__(self)
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289 self._sock = sock
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290 if "b" not in mode:
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291 mode += "b"
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292 self._mode = mode
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293 self._reading = "r" in mode
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294 self._writing = "w" in mode
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295 self._timeout_occurred = False
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296
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297 def readinto(self, b):
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298 """Read up to len(b) bytes into the writable buffer *b* and return
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299 the number of bytes read. If the socket is non-blocking and no bytes
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300 are available, None is returned.
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301
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302 If *b* is non-empty, a 0 return value indicates that the connection
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303 was shutdown at the other end.
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304 """
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305 self._checkClosed()
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306 self._checkReadable()
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307 if self._timeout_occurred:
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308 raise IOError("cannot read from timed out object")
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309 while True:
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310 try:
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311 return self._sock.recv_into(b)
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312 except timeout:
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313 self._timeout_occurred = True
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314 raise
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315 # except InterruptedError:
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316 # continue
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317 except error as e:
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318 if e.args[0] in _blocking_errnos:
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319 return None
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320 raise
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321
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322 def write(self, b):
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323 """Write the given bytes or bytearray object *b* to the socket
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324 and return the number of bytes written. This can be less than
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325 len(b) if not all data could be written. If the socket is
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326 non-blocking and no bytes could be written None is returned.
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327 """
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328 self._checkClosed()
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329 self._checkWritable()
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330 try:
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331 return self._sock.send(b)
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332 except error as e:
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333 # XXX what about EINTR?
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334 if e.args[0] in _blocking_errnos:
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335 return None
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336 raise
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337
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338 def readable(self):
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339 """True if the SocketIO is open for reading.
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340 """
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341 if self.closed:
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342 raise ValueError("I/O operation on closed socket.")
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343 return self._reading
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344
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345 def writable(self):
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346 """True if the SocketIO is open for writing.
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347 """
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348 if self.closed:
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349 raise ValueError("I/O operation on closed socket.")
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350 return self._writing
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351
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352 def seekable(self):
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353 """True if the SocketIO is open for seeking.
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354 """
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355 if self.closed:
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356 raise ValueError("I/O operation on closed socket.")
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357 return super().seekable()
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358
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359 def fileno(self):
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360 """Return the file descriptor of the underlying socket.
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361 """
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362 self._checkClosed()
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363 return self._sock.fileno()
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364
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365 @property
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366 def name(self):
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367 if not self.closed:
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368 return self.fileno()
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369 else:
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370 return -1
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371
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372 @property
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373 def mode(self):
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374 return self._mode
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375
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376 def close(self):
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377 """Close the SocketIO object. This doesn't close the underlying
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diff changeset
378 socket, except if all references to it have disappeared.
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379 """
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380 if self.closed:
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381 return
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382 io.RawIOBase.close(self)
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383 self._sock._decref_socketios()
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384 self._sock = None
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385
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386
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387 def getfqdn(name=''):
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388 """Get fully qualified domain name from name.
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389
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390 An empty argument is interpreted as meaning the local host.
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391
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392 First the hostname returned by gethostbyaddr() is checked, then
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393 possibly existing aliases. In case no FQDN is available, hostname
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394 from gethostname() is returned.
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395 """
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396 name = name.strip()
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397 if not name or name == '0.0.0.0':
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398 name = gethostname()
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399 try:
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400 hostname, aliases, ipaddrs = gethostbyaddr(name)
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401 except error:
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402 pass
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403 else:
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404 aliases.insert(0, hostname)
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405 for name in aliases:
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406 if '.' in name:
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407 break
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408 else:
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409 name = hostname
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410 return name
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411
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412
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413 # Re-use the same sentinel as in the Python stdlib socket module:
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414 from socket import _GLOBAL_DEFAULT_TIMEOUT
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415 # Was: _GLOBAL_DEFAULT_TIMEOUT = object()
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416
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417
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418 def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
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419 source_address=None):
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420 """Connect to *address* and return the socket object.
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421
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422 Convenience function. Connect to *address* (a 2-tuple ``(host,
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423 port)``) and return the socket object. Passing the optional
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424 *timeout* parameter will set the timeout on the socket instance
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425 before attempting to connect. If no *timeout* is supplied, the
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426 global default timeout setting returned by :func:`getdefaulttimeout`
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427 is used. If *source_address* is set it must be a tuple of (host, port)
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428 for the socket to bind as a source address before making the connection.
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429 An host of '' or port 0 tells the OS to use the default.
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430 """
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431
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432 host, port = address
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433 err = None
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434 for res in getaddrinfo(host, port, 0, SOCK_STREAM):
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435 af, socktype, proto, canonname, sa = res
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436 sock = None
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437 try:
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438 sock = socket(af, socktype, proto)
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439 if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
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440 sock.settimeout(timeout)
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441 if source_address:
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442 sock.bind(source_address)
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443 sock.connect(sa)
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444 return sock
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445
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446 except error as _:
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447 err = _
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448 if sock is not None:
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449 sock.close()
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450
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451 if err is not None:
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452 raise err
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453 else:
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454 raise error("getaddrinfo returns an empty list")