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Archipelago/Utils.py

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from __future__ import annotations
import asyncio
import json
import typing
import builtins
import os
import subprocess
import sys
import pickle
import functools
import io
import collections
import importlib
import logging
from typing import BinaryIO, Coroutine, Optional, Set, Dict, Any, Union
from yaml import load, load_all, dump, SafeLoader
try:
from yaml import CLoader as UnsafeLoader
from yaml import CDumper as Dumper
except ImportError:
from yaml import Loader as UnsafeLoader
from yaml import Dumper
if typing.TYPE_CHECKING:
import tkinter
import pathlib
def tuplize_version(version: str) -> Version:
return Version(*(int(piece, 10) for piece in version.split(".")))
class Version(typing.NamedTuple):
major: int
minor: int
build: int
def as_simple_string(self) -> str:
return ".".join(str(item) for item in self)
__version__ = "0.4.1"
version_tuple = tuplize_version(__version__)
is_linux = sys.platform.startswith("linux")
is_macos = sys.platform == "darwin"
is_windows = sys.platform in ("win32", "cygwin", "msys")
def int16_as_bytes(value: int) -> typing.List[int]:
value = value & 0xFFFF
return [value & 0xFF, (value >> 8) & 0xFF]
def int32_as_bytes(value: int) -> typing.List[int]:
value = value & 0xFFFFFFFF
return [value & 0xFF, (value >> 8) & 0xFF, (value >> 16) & 0xFF, (value >> 24) & 0xFF]
def pc_to_snes(value: int) -> int:
return ((value << 1) & 0x7F0000) | (value & 0x7FFF) | 0x8000
def snes_to_pc(value: int) -> int:
return ((value & 0x7F0000) >> 1) | (value & 0x7FFF)
RetType = typing.TypeVar("RetType")
def cache_argsless(function: typing.Callable[[], RetType]) -> typing.Callable[[], RetType]:
assert not function.__code__.co_argcount, "Can only cache 0 argument functions with this cache."
sentinel = object()
result: typing.Union[object, RetType] = sentinel
def _wrap() -> RetType:
nonlocal result
if result is sentinel:
result = function()
return typing.cast(RetType, result)
return _wrap
def is_frozen() -> bool:
return typing.cast(bool, getattr(sys, 'frozen', False))
def local_path(*path: str) -> str:
"""
Returns path to a file in the local Archipelago installation or source.
This might be read-only and user_path should be used instead for ROMs, configuration, etc.
"""
if hasattr(local_path, 'cached_path'):
pass
elif is_frozen():
if hasattr(sys, "_MEIPASS"):
# we are running in a PyInstaller bundle
local_path.cached_path = sys._MEIPASS # pylint: disable=protected-access,no-member
else:
# cx_Freeze
local_path.cached_path = os.path.dirname(os.path.abspath(sys.argv[0]))
else:
import __main__
if hasattr(__main__, "__file__") and os.path.isfile(__main__.__file__):
# we are running in a normal Python environment
local_path.cached_path = os.path.dirname(os.path.abspath(__main__.__file__))
else:
# pray
local_path.cached_path = os.path.abspath(".")
return os.path.join(local_path.cached_path, *path)
def home_path(*path: str) -> str:
"""Returns path to a file in the user home's Archipelago directory."""
if hasattr(home_path, 'cached_path'):
pass
elif sys.platform.startswith('linux'):
home_path.cached_path = os.path.expanduser('~/Archipelago')
os.makedirs(home_path.cached_path, 0o700, exist_ok=True)
else:
# not implemented
home_path.cached_path = local_path() # this will generate the same exceptions we got previously
return os.path.join(home_path.cached_path, *path)
def user_path(*path: str) -> str:
"""Returns either local_path or home_path based on write permissions."""
if hasattr(user_path, "cached_path"):
pass
elif os.access(local_path(), os.W_OK):
user_path.cached_path = local_path()
else:
user_path.cached_path = home_path()
# populate home from local - TODO: upgrade feature
if user_path.cached_path != local_path() and not os.path.exists(user_path("host.yaml")):
import shutil
for dn in ("Players", "data/sprites"):
shutil.copytree(local_path(dn), user_path(dn), dirs_exist_ok=True)
for fn in ("manifest.json", "host.yaml"):
shutil.copy2(local_path(fn), user_path(fn))
return os.path.join(user_path.cached_path, *path)
def cache_path(*path: str) -> str:
"""Returns path to a file in the user's Archipelago cache directory."""
if hasattr(cache_path, "cached_path"):
pass
else:
import platformdirs
cache_path.cached_path = platformdirs.user_cache_dir("Archipelago", False)
return os.path.join(cache_path.cached_path, *path)
def output_path(*path: str) -> str:
if hasattr(output_path, 'cached_path'):
return os.path.join(output_path.cached_path, *path)
output_path.cached_path = user_path(get_options()["general_options"]["output_path"])
path = os.path.join(output_path.cached_path, *path)
os.makedirs(os.path.dirname(path), exist_ok=True)
return path
def open_file(filename: typing.Union[str, "pathlib.Path"]) -> None:
if is_windows:
os.startfile(filename)
else:
from shutil import which
open_command = which("open") if is_macos else (which("xdg-open") or which("gnome-open") or which("kde-open"))
subprocess.call([open_command, filename])
# from https://gist.github.com/pypt/94d747fe5180851196eb#gistcomment-4015118 with some changes
class UniqueKeyLoader(SafeLoader):
def construct_mapping(self, node, deep=False):
mapping = set()
for key_node, value_node in node.value:
key = self.construct_object(key_node, deep=deep)
if key in mapping:
logging.error(f"YAML duplicates sanity check failed{key_node.start_mark}")
raise KeyError(f"Duplicate key {key} found in YAML. Already found keys: {mapping}.")
mapping.add(key)
return super().construct_mapping(node, deep)
parse_yaml = functools.partial(load, Loader=UniqueKeyLoader)
parse_yamls = functools.partial(load_all, Loader=UniqueKeyLoader)
unsafe_parse_yaml = functools.partial(load, Loader=UnsafeLoader)
del load, load_all # should not be used. don't leak their names
def get_cert_none_ssl_context():
import ssl
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
return ctx
@cache_argsless
def get_public_ipv4() -> str:
import socket
import urllib.request
ip = socket.gethostbyname(socket.gethostname())
ctx = get_cert_none_ssl_context()
try:
ip = urllib.request.urlopen("https://checkip.amazonaws.com/", context=ctx, timeout=10).read().decode("utf8").strip()
except Exception as e:
# noinspection PyBroadException
try:
ip = urllib.request.urlopen("https://v4.ident.me", context=ctx, timeout=10).read().decode("utf8").strip()
except Exception:
logging.exception(e)
pass # we could be offline, in a local game, so no point in erroring out
return ip
@cache_argsless
def get_public_ipv6() -> str:
import socket
import urllib.request
ip = socket.gethostbyname(socket.gethostname())
ctx = get_cert_none_ssl_context()
try:
ip = urllib.request.urlopen("https://v6.ident.me", context=ctx, timeout=10).read().decode("utf8").strip()
except Exception as e:
logging.exception(e)
pass # we could be offline, in a local game, or ipv6 may not be available
return ip
OptionsType = typing.Dict[str, typing.Dict[str, typing.Any]]
@cache_argsless
def get_default_options() -> OptionsType:
# Refer to host.yaml for comments as to what all these options mean.
options = {
"general_options": {
"output_path": "output",
},
"factorio_options": {
"executable": os.path.join("factorio", "bin", "x64", "factorio"),
"filter_item_sends": False,
"bridge_chat_out": True,
},
"sni_options": {
"sni_path": "SNI",
"snes_rom_start": True,
},
"sm_options": {
"rom_file": "Super Metroid (JU).sfc",
},
"soe_options": {
"rom_file": "Secret of Evermore (USA).sfc",
},
"lttp_options": {
"rom_file": "Zelda no Densetsu - Kamigami no Triforce (Japan).sfc",
},
"ladx_options": {
"rom_file": "Legend of Zelda, The - Link's Awakening DX (USA, Europe) (SGB Enhanced).gbc",
},
"server_options": {
"host": None,
"port": 38281,
"password": None,
"multidata": None,
"savefile": None,
"disable_save": False,
"loglevel": "info",
"server_password": None,
"disable_item_cheat": False,
"location_check_points": 1,
"hint_cost": 10,
"release_mode": "goal",
"collect_mode": "disabled",
"remaining_mode": "goal",
"auto_shutdown": 0,
"compatibility": 2,
"log_network": 0
},
"generator": {
"enemizer_path": os.path.join("EnemizerCLI", "EnemizerCLI.Core"),
"player_files_path": "Players",
"players": 0,
"weights_file_path": "weights.yaml",
"meta_file_path": "meta.yaml",
"spoiler": 3,
"glitch_triforce_room": 1,
"race": 0,
"plando_options": "bosses",
},
"minecraft_options": {
"forge_directory": "Minecraft Forge server",
"max_heap_size": "2G",
"release_channel": "release"
},
"oot_options": {
"rom_file": "The Legend of Zelda - Ocarina of Time.z64",
"rom_start": True
},
"dkc3_options": {
"rom_file": "Donkey Kong Country 3 - Dixie Kong's Double Trouble! (USA) (En,Fr).sfc",
},
"smw_options": {
"rom_file": "Super Mario World (USA).sfc",
},
"zillion_options": {
"rom_file": "Zillion (UE) [!].sms",
# RetroArch doesn't make it easy to launch a game from the command line.
# You have to know the path to the emulator core library on the user's computer.
"rom_start": "retroarch",
},
"pokemon_rb_options": {
"red_rom_file": "Pokemon Red (UE) [S][!].gb",
"blue_rom_file": "Pokemon Blue (UE) [S][!].gb",
"rom_start": True
},
"ffr_options": {
"display_msgs": True,
},
"lufia2ac_options": {
"rom_file": "Lufia II - Rise of the Sinistrals (USA).sfc",
},
"tloz_options": {
"rom_file": "Legend of Zelda, The (U) (PRG0) [!].nes",
"rom_start": True,
"display_msgs": True,
},
"wargroove_options": {
"root_directory": "C:/Program Files (x86)/Steam/steamapps/common/Wargroove"
},
"adventure_options": {
"rom_file": "ADVNTURE.BIN",
"display_msgs": True,
"rom_start": True,
"rom_args": ""
},
}
return options
def update_options(src: dict, dest: dict, filename: str, keys: list) -> OptionsType:
for key, value in src.items():
new_keys = keys.copy()
new_keys.append(key)
option_name = '.'.join(new_keys)
if key not in dest:
dest[key] = value
if filename.endswith("options.yaml"):
logging.info(f"Warning: {filename} is missing {option_name}")
elif isinstance(value, dict):
if not isinstance(dest.get(key, None), dict):
if filename.endswith("options.yaml"):
logging.info(f"Warning: {filename} has {option_name}, but it is not a dictionary. overwriting.")
dest[key] = value
else:
dest[key] = update_options(value, dest[key], filename, new_keys)
return dest
@cache_argsless
def get_options() -> OptionsType:
filenames = ("options.yaml", "host.yaml")
locations: typing.List[str] = []
if os.path.join(os.getcwd()) != local_path():
locations += filenames # use files from cwd only if it's not the local_path
locations += [user_path(filename) for filename in filenames]
for location in locations:
if os.path.exists(location):
with open(location) as f:
options = parse_yaml(f.read())
return update_options(get_default_options(), options, location, list())
raise FileNotFoundError(f"Could not find {filenames[1]} to load options.")
def persistent_store(category: str, key: typing.Any, value: typing.Any):
path = user_path("_persistent_storage.yaml")
storage: dict = persistent_load()
category = storage.setdefault(category, {})
category[key] = value
with open(path, "wt") as f:
f.write(dump(storage, Dumper=Dumper))
def persistent_load() -> typing.Dict[str, dict]:
storage = getattr(persistent_load, "storage", None)
if storage:
return storage
path = user_path("_persistent_storage.yaml")
storage: dict = {}
if os.path.exists(path):
try:
with open(path, "r") as f:
storage = unsafe_parse_yaml(f.read())
except Exception as e:
logging.debug(f"Could not read store: {e}")
if storage is None:
storage = {}
persistent_load.storage = storage
return storage
def get_file_safe_name(name: str) -> str:
return "".join(c for c in name if c not in '<>:"/\\|?*')
def load_data_package_for_checksum(game: str, checksum: typing.Optional[str]) -> Dict[str, Any]:
if checksum and game:
if checksum != get_file_safe_name(checksum):
raise ValueError(f"Bad symbols in checksum: {checksum}")
path = cache_path("datapackage", get_file_safe_name(game), f"{checksum}.json")
if os.path.exists(path):
try:
with open(path, "r", encoding="utf-8-sig") as f:
return json.load(f)
except Exception as e:
logging.debug(f"Could not load data package: {e}")
# fall back to old cache
cache = persistent_load().get("datapackage", {}).get("games", {}).get(game, {})
if cache.get("checksum") == checksum:
return cache
# cache does not match
return {}
def store_data_package_for_checksum(game: str, data: typing.Dict[str, Any]) -> None:
checksum = data.get("checksum")
if checksum and game:
if checksum != get_file_safe_name(checksum):
raise ValueError(f"Bad symbols in checksum: {checksum}")
game_folder = cache_path("datapackage", get_file_safe_name(game))
os.makedirs(game_folder, exist_ok=True)
try:
with open(os.path.join(game_folder, f"{checksum}.json"), "w", encoding="utf-8-sig") as f:
json.dump(data, f, ensure_ascii=False, separators=(",", ":"))
except Exception as e:
logging.debug(f"Could not store data package: {e}")
def get_adjuster_settings(game_name: str) -> typing.Dict[str, typing.Any]:
adjuster_settings = persistent_load().get("adjuster", {}).get(game_name, {})
return adjuster_settings
@cache_argsless
def get_unique_identifier():
uuid = persistent_load().get("client", {}).get("uuid", None)
if uuid:
return uuid
import uuid
uuid = uuid.getnode()
persistent_store("client", "uuid", uuid)
return uuid
safe_builtins = frozenset((
'set',
'frozenset',
))
class RestrictedUnpickler(pickle.Unpickler):
def __init__(self, *args, **kwargs):
super(RestrictedUnpickler, self).__init__(*args, **kwargs)
self.options_module = importlib.import_module("Options")
self.net_utils_module = importlib.import_module("NetUtils")
self.generic_properties_module = importlib.import_module("worlds.generic")
def find_class(self, module, name):
if module == "builtins" and name in safe_builtins:
return getattr(builtins, name)
# used by MultiServer -> savegame/multidata
if module == "NetUtils" and name in {"NetworkItem", "ClientStatus", "Hint", "SlotType", "NetworkSlot"}:
return getattr(self.net_utils_module, name)
# Options and Plando are unpickled by WebHost -> Generate
if module == "worlds.generic" and name in {"PlandoItem", "PlandoConnection"}:
return getattr(self.generic_properties_module, name)
# pep 8 specifies that modules should have "all-lowercase names" (options, not Options)
if module.lower().endswith("options"):
if module == "Options":
mod = self.options_module
else:
mod = importlib.import_module(module)
obj = getattr(mod, name)
if issubclass(obj, self.options_module.Option):
return obj
# Forbid everything else.
raise pickle.UnpicklingError(f"global '{module}.{name}' is forbidden")
def restricted_loads(s):
"""Helper function analogous to pickle.loads()."""
return RestrictedUnpickler(io.BytesIO(s)).load()
class ByValue:
"""
Mixin for enums to pickle value instead of name (restores pre-3.11 behavior). Use as left-most parent.
See https://github.com/python/cpython/pull/26658 for why this exists.
"""
def __reduce_ex__(self, prot):
return self.__class__, (self._value_, )
class KeyedDefaultDict(collections.defaultdict):
"""defaultdict variant that uses the missing key as argument to default_factory"""
default_factory: typing.Callable[[typing.Any], typing.Any]
def __missing__(self, key):
self[key] = value = self.default_factory(key)
return value
def get_text_between(text: str, start: str, end: str) -> str:
return text[text.index(start) + len(start): text.rindex(end)]
def get_text_after(text: str, start: str) -> str:
return text[text.index(start) + len(start):]
loglevel_mapping = {'error': logging.ERROR, 'info': logging.INFO, 'warning': logging.WARNING, 'debug': logging.DEBUG}
def init_logging(name: str, loglevel: typing.Union[str, int] = logging.INFO, write_mode: str = "w",
log_format: str = "[%(name)s at %(asctime)s]: %(message)s",
exception_logger: typing.Optional[str] = None):
import datetime
loglevel: int = loglevel_mapping.get(loglevel, loglevel)
log_folder = user_path("logs")
os.makedirs(log_folder, exist_ok=True)
root_logger = logging.getLogger()
for handler in root_logger.handlers[:]:
root_logger.removeHandler(handler)
handler.close()
root_logger.setLevel(loglevel)
logging.getLogger("websockets").setLevel(loglevel) # make sure level is applied for websockets
if "a" not in write_mode:
name += f"_{datetime.datetime.now().strftime('%Y_%m_%d_%H_%M_%S')}"
file_handler = logging.FileHandler(
os.path.join(log_folder, f"{name}.txt"),
write_mode,
encoding="utf-8-sig")
file_handler.setFormatter(logging.Formatter(log_format))
root_logger.addHandler(file_handler)
if sys.stdout:
root_logger.addHandler(
logging.StreamHandler(sys.stdout)
)
# Relay unhandled exceptions to logger.
if not getattr(sys.excepthook, "_wrapped", False): # skip if already modified
orig_hook = sys.excepthook
def handle_exception(exc_type, exc_value, exc_traceback):
if issubclass(exc_type, KeyboardInterrupt):
sys.__excepthook__(exc_type, exc_value, exc_traceback)
return
logging.getLogger(exception_logger).exception("Uncaught exception",
exc_info=(exc_type, exc_value, exc_traceback))
return orig_hook(exc_type, exc_value, exc_traceback)
handle_exception._wrapped = True
sys.excepthook = handle_exception
def _cleanup():
for file in os.scandir(log_folder):
if file.name.endswith(".txt"):
last_change = datetime.datetime.fromtimestamp(file.stat().st_mtime)
if datetime.datetime.now() - last_change > datetime.timedelta(days=7):
try:
os.unlink(file.path)
except Exception as e:
logging.exception(e)
else:
logging.debug(f"Deleted old logfile {file.path}")
import threading
threading.Thread(target=_cleanup, name="LogCleaner").start()
import platform
logging.info(
f"Archipelago ({__version__}) logging initialized"
f" on {platform.platform()}"
f" running Python {sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}"
)
def stream_input(stream, queue):
def queuer():
while 1:
try:
text = stream.readline().strip()
except UnicodeDecodeError as e:
logging.exception(e)
else:
if text:
queue.put_nowait(text)
from threading import Thread
thread = Thread(target=queuer, name=f"Stream handler for {stream.name}", daemon=True)
thread.start()
return thread
def tkinter_center_window(window: "tkinter.Tk") -> None:
window.update()
x = int(window.winfo_screenwidth() / 2 - window.winfo_reqwidth() / 2)
y = int(window.winfo_screenheight() / 2 - window.winfo_reqheight() / 2)
window.geometry(f"+{x}+{y}")
class VersionException(Exception):
pass
def chaining_prefix(index: int, labels: typing.Tuple[str]) -> str:
text = ""
max_label = len(labels) - 1
while index > max_label:
text += labels[-1]
index -= max_label
return labels[index] + text
# noinspection PyPep8Naming
def format_SI_prefix(value, power=1000, power_labels=("", "k", "M", "G", "T", "P", "E", "Z", "Y")) -> str:
"""Formats a value into a value + metric/si prefix. More info at https://en.wikipedia.org/wiki/Metric_prefix"""
import decimal
n = 0
value = decimal.Decimal(value)
limit = power - decimal.Decimal("0.005")
while value >= limit:
value /= power
n += 1
return f"{value.quantize(decimal.Decimal('1.00'))} {chaining_prefix(n, power_labels)}"
def get_fuzzy_results(input_word: str, wordlist: typing.Sequence[str], limit: typing.Optional[int] = None) \
-> typing.List[typing.Tuple[str, int]]:
import jellyfish
def get_fuzzy_ratio(word1: str, word2: str) -> float:
return (1 - jellyfish.damerau_levenshtein_distance(word1.lower(), word2.lower())
/ max(len(word1), len(word2)))
limit: int = limit if limit else len(wordlist)
return list(
map(
lambda container: (container[0], int(container[1]*100)), # convert up to limit to int %
sorted(
map(lambda candidate:
(candidate, get_fuzzy_ratio(input_word, candidate)),
wordlist),
key=lambda element: element[1],
reverse=True)[0:limit]
)
)
def open_filename(title: str, filetypes: typing.Sequence[typing.Tuple[str, typing.Sequence[str]]]) \
-> typing.Optional[str]:
def run(*args: str):
return subprocess.run(args, capture_output=True, text=True).stdout.split("\n", 1)[0] or None
if is_linux:
# prefer native dialog
from shutil import which
kdialog = which("kdialog")
if kdialog:
k_filters = '|'.join((f'{text} (*{" *".join(ext)})' for (text, ext) in filetypes))
return run(kdialog, f"--title={title}", "--getopenfilename", ".", k_filters)
zenity = which("zenity")
if zenity:
z_filters = (f'--file-filter={text} ({", ".join(ext)}) | *{" *".join(ext)}' for (text, ext) in filetypes)
return run(zenity, f"--title={title}", "--file-selection", *z_filters)
# fall back to tk
try:
import tkinter
import tkinter.filedialog
except Exception as e:
logging.error('Could not load tkinter, which is likely not installed. '
f'This attempt was made because open_filename was used for "{title}".')
raise e
else:
root = tkinter.Tk()
root.withdraw()
return tkinter.filedialog.askopenfilename(title=title, filetypes=((t[0], ' '.join(t[1])) for t in filetypes))
def messagebox(title: str, text: str, error: bool = False) -> None:
def run(*args: str):
return subprocess.run(args, capture_output=True, text=True).stdout.split("\n", 1)[0] or None
def is_kivy_running():
if "kivy" in sys.modules:
from kivy.app import App
return App.get_running_app() is not None
return False
if is_kivy_running():
from kvui import MessageBox
MessageBox(title, text, error).open()
return
if is_linux and "tkinter" not in sys.modules:
# prefer native dialog
from shutil import which
kdialog = which("kdialog")
if kdialog:
return run(kdialog, f"--title={title}", "--error" if error else "--msgbox", text)
zenity = which("zenity")
if zenity:
return run(zenity, f"--title={title}", f"--text={text}", "--error" if error else "--info")
# fall back to tk
try:
import tkinter
from tkinter.messagebox import showerror, showinfo
except Exception as e:
logging.error('Could not load tkinter, which is likely not installed. '
f'This attempt was made because messagebox was used for "{title}".')
raise e
else:
root = tkinter.Tk()
root.withdraw()
showerror(title, text) if error else showinfo(title, text)
root.update()
def title_sorted(data: typing.Sequence, key=None, ignore: typing.Set = frozenset(("a", "the"))):
"""Sorts a sequence of text ignoring typical articles like "a" or "the" in the beginning."""
def sorter(element: Union[str, Dict[str, Any]]) -> str:
if (not isinstance(element, str)):
element = element["title"]
parts = element.split(maxsplit=1)
if parts[0].lower() in ignore:
return parts[1].lower()
else:
return element.lower()
return sorted(data, key=lambda i: sorter(key(i)) if key else sorter(i))
def read_snes_rom(stream: BinaryIO, strip_header: bool = True) -> bytearray:
"""Reads rom into bytearray and optionally strips off any smc header"""
buffer = bytearray(stream.read())
if strip_header and len(buffer) % 0x400 == 0x200:
return buffer[0x200:]
return buffer
_faf_tasks: "Set[asyncio.Task[None]]" = set()
def async_start(co: Coroutine[typing.Any, typing.Any, bool], name: Optional[str] = None) -> None:
"""
Use this to start a task when you don't keep a reference to it or immediately await it,
to prevent early garbage collection. "fire-and-forget"
"""
# https://docs.python.org/3.10/library/asyncio-task.html#asyncio.create_task
# Python docs:
# ```
# Important: Save a reference to the result of [asyncio.create_task],
# to avoid a task disappearing mid-execution.
# ```
# This implementation follows the pattern given in that documentation.
task = asyncio.create_task(co, name=name)
_faf_tasks.add(task)
task.add_done_callback(_faf_tasks.discard)
def deprecate(message: str):
if __debug__:
raise Exception(message)
import warnings
warnings.warn(message)
def _extend_freeze_support() -> None:
"""Extend multiprocessing.freeze_support() to also work on Non-Windows for spawn."""
# upstream issue: https://github.com/python/cpython/issues/76327
# code based on https://github.com/pyinstaller/pyinstaller/blob/develop/PyInstaller/hooks/rthooks/pyi_rth_multiprocessing.py#L26
import multiprocessing
import multiprocessing.spawn
def _freeze_support() -> None:
"""Minimal freeze_support. Only apply this if frozen."""
from subprocess import _args_from_interpreter_flags
# Prevent `spawn` from trying to read `__main__` in from the main script
multiprocessing.process.ORIGINAL_DIR = None
# Handle the first process that MP will create
if (
len(sys.argv) >= 2 and sys.argv[-2] == '-c' and sys.argv[-1].startswith((
'from multiprocessing.semaphore_tracker import main', # Py<3.8
'from multiprocessing.resource_tracker import main', # Py>=3.8
'from multiprocessing.forkserver import main'
)) and set(sys.argv[1:-2]) == set(_args_from_interpreter_flags())
):
exec(sys.argv[-1])
sys.exit()
# Handle the second process that MP will create
if multiprocessing.spawn.is_forking(sys.argv):
kwargs = {}
for arg in sys.argv[2:]:
name, value = arg.split('=')
if value == 'None':
kwargs[name] = None
else:
kwargs[name] = int(value)
multiprocessing.spawn.spawn_main(**kwargs)
sys.exit()
if not is_windows and is_frozen():
multiprocessing.freeze_support = multiprocessing.spawn.freeze_support = _freeze_support
def freeze_support() -> None:
"""This behaves like multiprocessing.freeze_support but also works on Non-Windows."""
import multiprocessing
_extend_freeze_support()
multiprocessing.freeze_support()
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