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annotate lib/python3.8/site-packages/pip/_internal/utils/ui.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 # The following comment should be removed at some point in the future.
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2 # mypy: strict-optional=False
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3 # mypy: disallow-untyped-defs=False
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4
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5 from __future__ import absolute_import, division
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6
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7 import contextlib
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8 import itertools
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9 import logging
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10 import sys
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11 import time
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12 from signal import SIGINT, default_int_handler, signal
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13
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14 from pip._vendor import six
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15 from pip._vendor.progress import HIDE_CURSOR, SHOW_CURSOR
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16 from pip._vendor.progress.bar import Bar, FillingCirclesBar, IncrementalBar
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17 from pip._vendor.progress.spinner import Spinner
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18
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19 from pip._internal.utils.compat import WINDOWS
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20 from pip._internal.utils.logging import get_indentation
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21 from pip._internal.utils.misc import format_size
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22 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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23
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24 if MYPY_CHECK_RUNNING:
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25 from typing import Any, Iterator, IO
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26
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27 try:
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28 from pip._vendor import colorama
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29 # Lots of different errors can come from this, including SystemError and
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30 # ImportError.
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31 except Exception:
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32 colorama = None
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33
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34 logger = logging.getLogger(__name__)
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35
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36
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37 def _select_progress_class(preferred, fallback):
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38 encoding = getattr(preferred.file, "encoding", None)
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39
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40 # If we don't know what encoding this file is in, then we'll just assume
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41 # that it doesn't support unicode and use the ASCII bar.
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42 if not encoding:
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43 return fallback
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44
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45 # Collect all of the possible characters we want to use with the preferred
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46 # bar.
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47 characters = [
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48 getattr(preferred, "empty_fill", six.text_type()),
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49 getattr(preferred, "fill", six.text_type()),
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50 ]
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51 characters += list(getattr(preferred, "phases", []))
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52
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53 # Try to decode the characters we're using for the bar using the encoding
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54 # of the given file, if this works then we'll assume that we can use the
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55 # fancier bar and if not we'll fall back to the plaintext bar.
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56 try:
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57 six.text_type().join(characters).encode(encoding)
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58 except UnicodeEncodeError:
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59 return fallback
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60 else:
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61 return preferred
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62
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63
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64 _BaseBar = _select_progress_class(IncrementalBar, Bar) # type: Any
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65
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66
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67 class InterruptibleMixin(object):
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68 """
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69 Helper to ensure that self.finish() gets called on keyboard interrupt.
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70
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71 This allows downloads to be interrupted without leaving temporary state
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72 (like hidden cursors) behind.
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73
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74 This class is similar to the progress library's existing SigIntMixin
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75 helper, but as of version 1.2, that helper has the following problems:
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76
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77 1. It calls sys.exit().
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78 2. It discards the existing SIGINT handler completely.
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79 3. It leaves its own handler in place even after an uninterrupted finish,
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80 which will have unexpected delayed effects if the user triggers an
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81 unrelated keyboard interrupt some time after a progress-displaying
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82 download has already completed, for example.
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83 """
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84
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85 def __init__(self, *args, **kwargs):
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86 """
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87 Save the original SIGINT handler for later.
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88 """
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89 super(InterruptibleMixin, self).__init__(*args, **kwargs)
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90
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91 self.original_handler = signal(SIGINT, self.handle_sigint)
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92
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93 # If signal() returns None, the previous handler was not installed from
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94 # Python, and we cannot restore it. This probably should not happen,
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95 # but if it does, we must restore something sensible instead, at least.
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96 # The least bad option should be Python's default SIGINT handler, which
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97 # just raises KeyboardInterrupt.
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98 if self.original_handler is None:
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99 self.original_handler = default_int_handler
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100
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101 def finish(self):
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102 """
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103 Restore the original SIGINT handler after finishing.
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104
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105 This should happen regardless of whether the progress display finishes
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106 normally, or gets interrupted.
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107 """
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108 super(InterruptibleMixin, self).finish()
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109 signal(SIGINT, self.original_handler)
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110
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111 def handle_sigint(self, signum, frame):
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112 """
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113 Call self.finish() before delegating to the original SIGINT handler.
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114
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115 This handler should only be in place while the progress display is
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116 active.
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117 """
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118 self.finish()
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119 self.original_handler(signum, frame)
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120
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121
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122 class SilentBar(Bar):
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123
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124 def update(self):
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125 pass
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126
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127
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128 class BlueEmojiBar(IncrementalBar):
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129
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130 suffix = "%(percent)d%%"
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131 bar_prefix = " "
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132 bar_suffix = " "
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133 phases = (u"\U0001F539", u"\U0001F537", u"\U0001F535") # type: Any
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134
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135
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136 class DownloadProgressMixin(object):
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137
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138 def __init__(self, *args, **kwargs):
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139 super(DownloadProgressMixin, self).__init__(*args, **kwargs)
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140 self.message = (" " * (get_indentation() + 2)) + self.message
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141
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142 @property
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143 def downloaded(self):
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144 return format_size(self.index)
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145
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146 @property
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147 def download_speed(self):
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148 # Avoid zero division errors...
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149 if self.avg == 0.0:
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150 return "..."
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151 return format_size(1 / self.avg) + "/s"
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152
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153 @property
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154 def pretty_eta(self):
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155 if self.eta:
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156 return "eta %s" % self.eta_td
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157 return ""
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158
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159 def iter(self, it):
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160 for x in it:
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161 yield x
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162 self.next(len(x))
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163 self.finish()
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164
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165
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166 class WindowsMixin(object):
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167
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168 def __init__(self, *args, **kwargs):
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169 # The Windows terminal does not support the hide/show cursor ANSI codes
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170 # even with colorama. So we'll ensure that hide_cursor is False on
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171 # Windows.
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172 # This call needs to go before the super() call, so that hide_cursor
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173 # is set in time. The base progress bar class writes the "hide cursor"
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174 # code to the terminal in its init, so if we don't set this soon
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175 # enough, we get a "hide" with no corresponding "show"...
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176 if WINDOWS and self.hide_cursor:
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177 self.hide_cursor = False
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178
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179 super(WindowsMixin, self).__init__(*args, **kwargs)
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180
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181 # Check if we are running on Windows and we have the colorama module,
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182 # if we do then wrap our file with it.
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183 if WINDOWS and colorama:
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184 self.file = colorama.AnsiToWin32(self.file)
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185 # The progress code expects to be able to call self.file.isatty()
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186 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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187 # add it.
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188 self.file.isatty = lambda: self.file.wrapped.isatty()
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189 # The progress code expects to be able to call self.file.flush()
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190 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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191 # add it.
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192 self.file.flush = lambda: self.file.wrapped.flush()
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193
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194
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195 class BaseDownloadProgressBar(WindowsMixin, InterruptibleMixin,
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196 DownloadProgressMixin):
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197
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198 file = sys.stdout
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199 message = "%(percent)d%%"
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200 suffix = "%(downloaded)s %(download_speed)s %(pretty_eta)s"
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201
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202 # NOTE: The "type: ignore" comments on the following classes are there to
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203 # work around https://github.com/python/typing/issues/241
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204
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205
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206 class DefaultDownloadProgressBar(BaseDownloadProgressBar,
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207 _BaseBar):
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208 pass
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209
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210
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211 class DownloadSilentBar(BaseDownloadProgressBar, SilentBar): # type: ignore
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212 pass
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213
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214
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215 class DownloadBar(BaseDownloadProgressBar, # type: ignore
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216 Bar):
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217 pass
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218
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219
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220 class DownloadFillingCirclesBar(BaseDownloadProgressBar, # type: ignore
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221 FillingCirclesBar):
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222 pass
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223
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224
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225 class DownloadBlueEmojiProgressBar(BaseDownloadProgressBar, # type: ignore
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226 BlueEmojiBar):
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227 pass
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228
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229
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230 class DownloadProgressSpinner(WindowsMixin, InterruptibleMixin,
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231 DownloadProgressMixin, Spinner):
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232
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233 file = sys.stdout
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234 suffix = "%(downloaded)s %(download_speed)s"
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235
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236 def next_phase(self):
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237 if not hasattr(self, "_phaser"):
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238 self._phaser = itertools.cycle(self.phases)
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239 return next(self._phaser)
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240
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241 def update(self):
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242 message = self.message % self
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243 phase = self.next_phase()
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244 suffix = self.suffix % self
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245 line = ''.join([
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246 message,
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247 " " if message else "",
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248 phase,
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249 " " if suffix else "",
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250 suffix,
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251 ])
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252
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253 self.writeln(line)
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254
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255
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256 BAR_TYPES = {
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257 "off": (DownloadSilentBar, DownloadSilentBar),
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258 "on": (DefaultDownloadProgressBar, DownloadProgressSpinner),
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259 "ascii": (DownloadBar, DownloadProgressSpinner),
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260 "pretty": (DownloadFillingCirclesBar, DownloadProgressSpinner),
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261 "emoji": (DownloadBlueEmojiProgressBar, DownloadProgressSpinner)
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262 }
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263
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264
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265 def DownloadProgressProvider(progress_bar, max=None):
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266 if max is None or max == 0:
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267 return BAR_TYPES[progress_bar][1]().iter
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268 else:
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269 return BAR_TYPES[progress_bar][0](max=max).iter
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270
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271
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272 ################################################################
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273 # Generic "something is happening" spinners
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274 #
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275 # We don't even try using progress.spinner.Spinner here because it's actually
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276 # simpler to reimplement from scratch than to coerce their code into doing
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277 # what we need.
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278 ################################################################
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279
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280 @contextlib.contextmanager
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281 def hidden_cursor(file):
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282 # type: (IO[Any]) -> Iterator[None]
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283 # The Windows terminal does not support the hide/show cursor ANSI codes,
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284 # even via colorama. So don't even try.
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285 if WINDOWS:
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286 yield
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287 # We don't want to clutter the output with control characters if we're
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288 # writing to a file, or if the user is running with --quiet.
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289 # See https://github.com/pypa/pip/issues/3418
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290 elif not file.isatty() or logger.getEffectiveLevel() > logging.INFO:
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291 yield
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292 else:
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293 file.write(HIDE_CURSOR)
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294 try:
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295 yield
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296 finally:
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297 file.write(SHOW_CURSOR)
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298
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299
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300 class RateLimiter(object):
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301 def __init__(self, min_update_interval_seconds):
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302 # type: (float) -> None
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303 self._min_update_interval_seconds = min_update_interval_seconds
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304 self._last_update = 0 # type: float
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305
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306 def ready(self):
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307 # type: () -> bool
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308 now = time.time()
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309 delta = now - self._last_update
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310 return delta >= self._min_update_interval_seconds
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311
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312 def reset(self):
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313 # type: () -> None
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314 self._last_update = time.time()
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315
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316
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317 class SpinnerInterface(object):
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318 def spin(self):
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319 # type: () -> None
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320 raise NotImplementedError()
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321
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322 def finish(self, final_status):
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323 # type: (str) -> None
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324 raise NotImplementedError()
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325
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326
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327 class InteractiveSpinner(SpinnerInterface):
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328 def __init__(self, message, file=None, spin_chars="-\\|/",
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329 # Empirically, 8 updates/second looks nice
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330 min_update_interval_seconds=0.125):
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331 self._message = message
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332 if file is None:
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333 file = sys.stdout
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334 self._file = file
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335 self._rate_limiter = RateLimiter(min_update_interval_seconds)
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336 self._finished = False
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337
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338 self._spin_cycle = itertools.cycle(spin_chars)
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339
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340 self._file.write(" " * get_indentation() + self._message + " ... ")
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341 self._width = 0
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342
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343 def _write(self, status):
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344 assert not self._finished
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345 # Erase what we wrote before by backspacing to the beginning, writing
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346 # spaces to overwrite the old text, and then backspacing again
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347 backup = "\b" * self._width
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348 self._file.write(backup + " " * self._width + backup)
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349 # Now we have a blank slate to add our status
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350 self._file.write(status)
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351 self._width = len(status)
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352 self._file.flush()
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353 self._rate_limiter.reset()
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354
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355 def spin(self):
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356 # type: () -> None
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357 if self._finished:
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358 return
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359 if not self._rate_limiter.ready():
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360 return
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361 self._write(next(self._spin_cycle))
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362
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363 def finish(self, final_status):
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364 # type: (str) -> None
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365 if self._finished:
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366 return
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367 self._write(final_status)
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368 self._file.write("\n")
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369 self._file.flush()
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370 self._finished = True
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371
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372
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373 # Used for dumb terminals, non-interactive installs (no tty), etc.
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374 # We still print updates occasionally (once every 60 seconds by default) to
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375 # act as a keep-alive for systems like Travis-CI that take lack-of-output as
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376 # an indication that a task has frozen.
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377 class NonInteractiveSpinner(SpinnerInterface):
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378 def __init__(self, message, min_update_interval_seconds=60):
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379 # type: (str, float) -> None
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380 self._message = message
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381 self._finished = False
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382 self._rate_limiter = RateLimiter(min_update_interval_seconds)
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383 self._update("started")
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384
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385 def _update(self, status):
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386 assert not self._finished
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387 self._rate_limiter.reset()
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388 logger.info("%s: %s", self._message, status)
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389
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390 def spin(self):
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391 # type: () -> None
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392 if self._finished:
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393 return
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394 if not self._rate_limiter.ready():
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395 return
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396 self._update("still running...")
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397
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398 def finish(self, final_status):
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399 # type: (str) -> None
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400 if self._finished:
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401 return
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402 self._update("finished with status '%s'" % (final_status,))
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403 self._finished = True
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404
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405
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406 @contextlib.contextmanager
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407 def open_spinner(message):
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408 # type: (str) -> Iterator[SpinnerInterface]
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409 # Interactive spinner goes directly to sys.stdout rather than being routed
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410 # through the logging system, but it acts like it has level INFO,
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411 # i.e. it's only displayed if we're at level INFO or better.
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412 # Non-interactive spinner goes through the logging system, so it is always
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413 # in sync with logging configuration.
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414 if sys.stdout.isatty() and logger.getEffectiveLevel() <= logging.INFO:
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415 spinner = InteractiveSpinner(message) # type: SpinnerInterface
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416 else:
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417 spinner = NonInteractiveSpinner(message)
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418 try:
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419 with hidden_cursor(sys.stdout):
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420 yield spinner
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421 except KeyboardInterrupt:
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422 spinner.finish("canceled")
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423 raise
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424 except Exception:
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425 spinner.finish("error")
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426 raise
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427 else:
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428 spinner.finish("done")