Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/urllib3/util/connection.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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0
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1 from __future__ import absolute_import
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2 import socket
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3 from .wait import NoWayToWaitForSocketError, wait_for_read
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4 from ..contrib import _appengine_environ
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5
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6
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7 def is_connection_dropped(conn): # Platform-specific
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8 """
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9 Returns True if the connection is dropped and should be closed.
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10
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11 :param conn:
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12 :class:`httplib.HTTPConnection` object.
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13
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14 Note: For platforms like AppEngine, this will always return ``False`` to
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15 let the platform handle connection recycling transparently for us.
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16 """
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17 sock = getattr(conn, "sock", False)
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18 if sock is False: # Platform-specific: AppEngine
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19 return False
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20 if sock is None: # Connection already closed (such as by httplib).
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21 return True
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22 try:
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23 # Returns True if readable, which here means it's been dropped
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24 return wait_for_read(sock, timeout=0.0)
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25 except NoWayToWaitForSocketError: # Platform-specific: AppEngine
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26 return False
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27
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28
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29 # This function is copied from socket.py in the Python 2.7 standard
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30 # library test suite. Added to its signature is only `socket_options`.
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31 # One additional modification is that we avoid binding to IPv6 servers
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32 # discovered in DNS if the system doesn't have IPv6 functionality.
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33 def create_connection(
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34 address,
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35 timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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36 source_address=None,
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37 socket_options=None,
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38 ):
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39 """Connect to *address* and return the socket object.
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40
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41 Convenience function. Connect to *address* (a 2-tuple ``(host,
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42 port)``) and return the socket object. Passing the optional
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43 *timeout* parameter will set the timeout on the socket instance
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44 before attempting to connect. If no *timeout* is supplied, the
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45 global default timeout setting returned by :func:`getdefaulttimeout`
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46 is used. If *source_address* is set it must be a tuple of (host, port)
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47 for the socket to bind as a source address before making the connection.
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48 An host of '' or port 0 tells the OS to use the default.
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49 """
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50
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51 host, port = address
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52 if host.startswith("["):
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53 host = host.strip("[]")
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54 err = None
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55
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56 # Using the value from allowed_gai_family() in the context of getaddrinfo lets
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57 # us select whether to work with IPv4 DNS records, IPv6 records, or both.
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58 # The original create_connection function always returns all records.
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59 family = allowed_gai_family()
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60
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61 for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
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62 af, socktype, proto, canonname, sa = res
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63 sock = None
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64 try:
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65 sock = socket.socket(af, socktype, proto)
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66
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67 # If provided, set socket level options before connecting.
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68 _set_socket_options(sock, socket_options)
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69
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70 if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:
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71 sock.settimeout(timeout)
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72 if source_address:
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73 sock.bind(source_address)
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74 sock.connect(sa)
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75 return sock
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76
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77 except socket.error as e:
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78 err = e
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79 if sock is not None:
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80 sock.close()
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81 sock = None
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82
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83 if err is not None:
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84 raise err
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85
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86 raise socket.error("getaddrinfo returns an empty list")
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87
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88
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89 def _set_socket_options(sock, options):
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90 if options is None:
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91 return
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92
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93 for opt in options:
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94 sock.setsockopt(*opt)
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95
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96
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97 def allowed_gai_family():
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98 """This function is designed to work in the context of
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99 getaddrinfo, where family=socket.AF_UNSPEC is the default and
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100 will perform a DNS search for both IPv6 and IPv4 records."""
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101
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102 family = socket.AF_INET
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103 if HAS_IPV6:
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104 family = socket.AF_UNSPEC
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105 return family
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106
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107
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108 def _has_ipv6(host):
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109 """ Returns True if the system can bind an IPv6 address. """
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110 sock = None
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111 has_ipv6 = False
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112
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113 # App Engine doesn't support IPV6 sockets and actually has a quota on the
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114 # number of sockets that can be used, so just early out here instead of
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115 # creating a socket needlessly.
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116 # See https://github.com/urllib3/urllib3/issues/1446
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117 if _appengine_environ.is_appengine_sandbox():
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118 return False
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119
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120 if socket.has_ipv6:
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121 # has_ipv6 returns true if cPython was compiled with IPv6 support.
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122 # It does not tell us if the system has IPv6 support enabled. To
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123 # determine that we must bind to an IPv6 address.
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124 # https://github.com/urllib3/urllib3/pull/611
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125 # https://bugs.python.org/issue658327
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126 try:
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127 sock = socket.socket(socket.AF_INET6)
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128 sock.bind((host, 0))
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129 has_ipv6 = True
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130 except Exception:
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131 pass
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132
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133 if sock:
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134 sock.close()
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135 return has_ipv6
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136
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137
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138 HAS_IPV6 = _has_ipv6("::1")