Mercurial > libervia-backend

annotate libervia/backend/tools/common/utils.py @ 4335:430d5d99a740

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plugin XEP-0358: "Publishing Available Jingle Sessions" implementation: rel 453
author Goffi <goffi@goffi.org>
date Tue, 03 Dec 2024 00:13:07 +0100
parents 0d7bb4df2343
children
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1 #!/usr/bin/env python3
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2
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3 # Libervia: an XMPP client
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """Misc utils for both backend and frontends"""
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20
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21 import collections.abc
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22
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23 size_units = {
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24 "b": 1,
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25 "kb": 1000,
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26 "mb": 1000**2,
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27 "gb": 1000**3,
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28 "tb": 1000**4,
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29 "pb": 1000**5,
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30 "eb": 1000**6,
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31 "zb": 1000**7,
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32 "yb": 1000**8,
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33 "o": 1,
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34 "ko": 1000,
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35 "mo": 1000**2,
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36 "go": 1000**3,
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37 "to": 1000**4,
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38 "po": 1000**5,
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39 "eo": 1000**6,
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40 "zo": 1000**7,
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41 "yo": 1000**8,
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42 "kib": 1024,
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43 "mib": 1024**2,
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44 "gib": 1024**3,
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45 "tib": 1024**4,
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46 "pib": 1024**5,
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47 "eib": 1024**6,
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48 "zib": 1024**7,
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49 "yib": 1024**8,
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50 "kio": 1024,
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51 "mio": 1024**2,
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52 "gio": 1024**3,
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53 "tio": 1024**4,
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54 "pio": 1024**5,
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55 "eio": 1024**6,
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56 "zio": 1024**7,
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57 "yio": 1024**8,
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58 }
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59
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60
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61 def per_luminance(red, green, blue):
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62 """Caculate the perceived luminance of a RGB color
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63
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64 @param red(int): 0-1 normalized value of red
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65 @param green(int): 0-1 normalized value of green
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66 @param blue(int): 0-1 normalized value of blue
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67 @return (float): 0-1 value of luminance (<0.5 is dark, else it's light)
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68 """
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69 # cf. https://stackoverflow.com/a/1855903, thanks Gacek
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70
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71 return 0.299 * red + 0.587 * green + 0.114 * blue
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72
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73
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74 def recursive_update(ori: dict, update: dict):
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75 """Recursively update a dictionary"""
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76 # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli
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77 for k, v in update.items():
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78 if isinstance(v, collections.abc.Mapping):
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79 ori[k] = recursive_update(ori.get(k, {}), v)
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80 else:
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81 ori[k] = v
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82 return ori
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83
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84
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85 class OrderedSet(collections.abc.MutableSet):
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86 """A mutable sequence which doesn't keep duplicates"""
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87
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88 # TODO: complete missing set methods
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89
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90 def __init__(self, values=None):
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91 self._dict = {}
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92 if values is not None:
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93 self.update(values)
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94
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95 def __len__(self):
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96 return len(self._dict)
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97
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98 def __iter__(self):
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99 return iter(self._dict.keys())
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100
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101 def __contains__(self, item):
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102 return item in self._dict
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103
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104 def add(self, item):
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105 self._dict[item] = None
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106
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107 def discard(self, item):
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108 try:
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109 del self._dict[item]
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110 except KeyError:
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111 pass
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112
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113 def update(self, items):
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114 self._dict.update({i: None for i in items})
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115
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116
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117 def parse_size(size):
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118 """Parse a file size with optional multiple symbole"""
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119 try:
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120 return int(size)
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121 except ValueError:
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122 number = []
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123 symbol = []
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124 try:
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125 for c in size:
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126 if c == " ":
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127 continue
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128 if c.isdigit():
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129 number.append(c)
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130 elif c.isalpha():
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131 symbol.append(c)
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132 else:
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133 raise ValueError("unexpected char in size: {c!r} (size: {size!r})")
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134 number = int("".join(number))
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135 symbol = "".join(symbol)
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136 if symbol:
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137 try:
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138 multiplier = size_units[symbol.lower()]
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139 except KeyError:
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140 raise ValueError(
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141 "unknown size multiplier symbole: {symbol!r} (size: {size!r})"
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142 )
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143 else:
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144 return number * multiplier
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145 return number
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146 except Exception as e:
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147 raise ValueError(f"invalid size: {e}")
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148
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149
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150 def get_size_multiplier(size: int | str, suffix="o"):
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151 """Get multiplier of a file size"""
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152 size = int(size)
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153 #  cf. https://stackoverflow.com/a/1094933 (thanks)
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154 for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
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155 if abs(size) < 1024.0:
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156 return size, f"{unit}{suffix}"
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157 size /= 1024.0
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158 return size, f"Yi{suffix}"
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159
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160
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161 def get_human_size(size: int | str, suffix: str = "o", sep: str = " ") -> str:
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162 """Return data size in a human readable format."""
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163 size, symbol = get_size_multiplier(size, suffix)
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164 return f"{size:.2f}{sep}{symbol}"