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annotate planemo/lib/python3.7/site-packages/urllib3/util/wait.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 import errno
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2 from functools import partial
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3 import select
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4 import sys
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5
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6 try:
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7 from time import monotonic
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8 except ImportError:
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9 from time import time as monotonic
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10
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11 __all__ = ["NoWayToWaitForSocketError", "wait_for_read", "wait_for_write"]
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12
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13
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14 class NoWayToWaitForSocketError(Exception):
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15 pass
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16
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17
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18 # How should we wait on sockets?
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19 #
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20 # There are two types of APIs you can use for waiting on sockets: the fancy
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21 # modern stateful APIs like epoll/kqueue, and the older stateless APIs like
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22 # select/poll. The stateful APIs are more efficient when you have a lots of
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23 # sockets to keep track of, because you can set them up once and then use them
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24 # lots of times. But we only ever want to wait on a single socket at a time
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25 # and don't want to keep track of state, so the stateless APIs are actually
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26 # more efficient. So we want to use select() or poll().
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27 #
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28 # Now, how do we choose between select() and poll()? On traditional Unixes,
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29 # select() has a strange calling convention that makes it slow, or fail
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30 # altogether, for high-numbered file descriptors. The point of poll() is to fix
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31 # that, so on Unixes, we prefer poll().
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32 #
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33 # On Windows, there is no poll() (or at least Python doesn't provide a wrapper
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34 # for it), but that's OK, because on Windows, select() doesn't have this
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35 # strange calling convention; plain select() works fine.
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36 #
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37 # So: on Windows we use select(), and everywhere else we use poll(). We also
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38 # fall back to select() in case poll() is somehow broken or missing.
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39
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40 if sys.version_info >= (3, 5):
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41 # Modern Python, that retries syscalls by default
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42 def _retry_on_intr(fn, timeout):
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43 return fn(timeout)
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44
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45
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46 else:
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47 # Old and broken Pythons.
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48 def _retry_on_intr(fn, timeout):
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49 if timeout is None:
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50 deadline = float("inf")
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51 else:
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52 deadline = monotonic() + timeout
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53
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54 while True:
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55 try:
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56 return fn(timeout)
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57 # OSError for 3 <= pyver < 3.5, select.error for pyver <= 2.7
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58 except (OSError, select.error) as e:
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59 # 'e.args[0]' incantation works for both OSError and select.error
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60 if e.args[0] != errno.EINTR:
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61 raise
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62 else:
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63 timeout = deadline - monotonic()
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64 if timeout < 0:
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65 timeout = 0
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66 if timeout == float("inf"):
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67 timeout = None
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68 continue
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69
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70
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71 def select_wait_for_socket(sock, read=False, write=False, timeout=None):
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72 if not read and not write:
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73 raise RuntimeError("must specify at least one of read=True, write=True")
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74 rcheck = []
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75 wcheck = []
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76 if read:
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77 rcheck.append(sock)
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78 if write:
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79 wcheck.append(sock)
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80 # When doing a non-blocking connect, most systems signal success by
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81 # marking the socket writable. Windows, though, signals success by marked
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82 # it as "exceptional". We paper over the difference by checking the write
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83 # sockets for both conditions. (The stdlib selectors module does the same
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84 # thing.)
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85 fn = partial(select.select, rcheck, wcheck, wcheck)
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86 rready, wready, xready = _retry_on_intr(fn, timeout)
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87 return bool(rready or wready or xready)
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88
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89
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90 def poll_wait_for_socket(sock, read=False, write=False, timeout=None):
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91 if not read and not write:
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92 raise RuntimeError("must specify at least one of read=True, write=True")
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93 mask = 0
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94 if read:
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95 mask |= select.POLLIN
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96 if write:
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97 mask |= select.POLLOUT
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98 poll_obj = select.poll()
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99 poll_obj.register(sock, mask)
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100
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101 # For some reason, poll() takes timeout in milliseconds
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102 def do_poll(t):
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103 if t is not None:
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104 t *= 1000
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105 return poll_obj.poll(t)
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106
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107 return bool(_retry_on_intr(do_poll, timeout))
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108
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109
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110 def null_wait_for_socket(*args, **kwargs):
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111 raise NoWayToWaitForSocketError("no select-equivalent available")
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112
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113
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114 def _have_working_poll():
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115 # Apparently some systems have a select.poll that fails as soon as you try
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116 # to use it, either due to strange configuration or broken monkeypatching
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117 # from libraries like eventlet/greenlet.
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118 try:
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119 poll_obj = select.poll()
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120 _retry_on_intr(poll_obj.poll, 0)
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121 except (AttributeError, OSError):
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122 return False
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123 else:
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124 return True
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125
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126
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127 def wait_for_socket(*args, **kwargs):
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128 # We delay choosing which implementation to use until the first time we're
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129 # called. We could do it at import time, but then we might make the wrong
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130 # decision if someone goes wild with monkeypatching select.poll after
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131 # we're imported.
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132 global wait_for_socket
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133 if _have_working_poll():
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134 wait_for_socket = poll_wait_for_socket
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135 elif hasattr(select, "select"):
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136 wait_for_socket = select_wait_for_socket
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137 else: # Platform-specific: Appengine.
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138 wait_for_socket = null_wait_for_socket
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139 return wait_for_socket(*args, **kwargs)
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140
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141
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142 def wait_for_read(sock, timeout=None):
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143 """ Waits for reading to be available on a given socket.
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144 Returns True if the socket is readable, or False if the timeout expired.
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145 """
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146 return wait_for_socket(sock, read=True, timeout=timeout)
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147
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148
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149 def wait_for_write(sock, timeout=None):
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150 """ Waits for writing to be available on a given socket.
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151 Returns True if the socket is readable, or False if the timeout expired.
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152 """
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153 return wait_for_socket(sock, write=True, timeout=timeout)