view libervia/backend/tools/common/utils.py @ 4306:94e0968987cd

plugin XEP-0033: code modernisation, improve delivery, data validation: - Code has been rewritten using Pydantic models and `async` coroutines for data validation and cleaner element parsing/generation. - Delivery has been completely rewritten. It now works even if server doesn't support multicast, and send to local multicast service first. Delivering to local multicast service first is due to bad support of XEP-0033 in server (notably Prosody which has an incomplete implementation), and the current impossibility to detect if a sub-domain service handles fully multicast or only for local domains. This is a workaround to have a good balance between backward compatilibity and use of bandwith, and to make it work with the incoming email gateway implementation (the gateway will only deliver to entities of its own domain). - disco feature checking now uses `async` corountines. `host` implementation still use Deferred return values for compatibility with legacy code. rel 450
author Goffi <goffi@goffi.org>
date Thu, 26 Sep 2024 16:12:01 +0200 (4 months ago)
parents 0d7bb4df2343
children
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#!/usr/bin/env python3

# Libervia: an XMPP client
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""Misc utils for both backend and frontends"""

import collections.abc

size_units = {
    "b": 1,
    "kb": 1000,
    "mb": 1000**2,
    "gb": 1000**3,
    "tb": 1000**4,
    "pb": 1000**5,
    "eb": 1000**6,
    "zb": 1000**7,
    "yb": 1000**8,
    "o": 1,
    "ko": 1000,
    "mo": 1000**2,
    "go": 1000**3,
    "to": 1000**4,
    "po": 1000**5,
    "eo": 1000**6,
    "zo": 1000**7,
    "yo": 1000**8,
    "kib": 1024,
    "mib": 1024**2,
    "gib": 1024**3,
    "tib": 1024**4,
    "pib": 1024**5,
    "eib": 1024**6,
    "zib": 1024**7,
    "yib": 1024**8,
    "kio": 1024,
    "mio": 1024**2,
    "gio": 1024**3,
    "tio": 1024**4,
    "pio": 1024**5,
    "eio": 1024**6,
    "zio": 1024**7,
    "yio": 1024**8,
}


def per_luminance(red, green, blue):
    """Caculate the perceived luminance of a RGB color

    @param red(int): 0-1 normalized value of red
    @param green(int): 0-1 normalized value of green
    @param blue(int): 0-1 normalized value of blue
    @return (float): 0-1 value of luminance (<0.5 is dark, else it's light)
    """
    # cf. https://stackoverflow.com/a/1855903, thanks Gacek

    return 0.299 * red + 0.587 * green + 0.114 * blue


def recursive_update(ori: dict, update: dict):
    """Recursively update a dictionary"""
    # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli
    for k, v in update.items():
        if isinstance(v, collections.abc.Mapping):
            ori[k] = recursive_update(ori.get(k, {}), v)
        else:
            ori[k] = v
    return ori


class OrderedSet(collections.abc.MutableSet):
    """A mutable sequence which doesn't keep duplicates"""

    # TODO: complete missing set methods

    def __init__(self, values=None):
        self._dict = {}
        if values is not None:
            self.update(values)

    def __len__(self):
        return len(self._dict)

    def __iter__(self):
        return iter(self._dict.keys())

    def __contains__(self, item):
        return item in self._dict

    def add(self, item):
        self._dict[item] = None

    def discard(self, item):
        try:
            del self._dict[item]
        except KeyError:
            pass

    def update(self, items):
        self._dict.update({i: None for i in items})


def parse_size(size):
    """Parse a file size with optional multiple symbole"""
    try:
        return int(size)
    except ValueError:
        number = []
        symbol = []
        try:
            for c in size:
                if c == " ":
                    continue
                if c.isdigit():
                    number.append(c)
                elif c.isalpha():
                    symbol.append(c)
                else:
                    raise ValueError("unexpected char in size: {c!r} (size: {size!r})")
            number = int("".join(number))
            symbol = "".join(symbol)
            if symbol:
                try:
                    multiplier = size_units[symbol.lower()]
                except KeyError:
                    raise ValueError(
                        "unknown size multiplier symbole: {symbol!r} (size: {size!r})"
                    )
                else:
                    return number * multiplier
            return number
        except Exception as e:
            raise ValueError(f"invalid size: {e}")


def get_size_multiplier(size: int | str, suffix="o"):
    """Get multiplier of a file size"""
    size = int(size)
    #  cf. https://stackoverflow.com/a/1094933 (thanks)
    for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
        if abs(size) < 1024.0:
            return size, f"{unit}{suffix}"
        size /= 1024.0
    return size, f"Yi{suffix}"


def get_human_size(size: int | str, suffix: str = "o", sep: str = " ") -> str:
    """Return data size in a human readable format."""
    size, symbol = get_size_multiplier(size, suffix)
    return f"{size:.2f}{sep}{symbol}"