Genro-Toolbox

Essential utilities for the Genro ecosystem

Part of Genro Kyō ecosystem.

A lightweight, zero-dependency Python library providing core utilities that can be used across all Genro projects.

📚 Full Documentation

Installation

pip install genro-toolbox

Features

• extract_kwargs - Decorator to group kwargs by prefix
• metadata - Decorator to stamp keyword arguments as attributes on functions or classes
• dictExtract - Extract dict items by key prefix
• smartsplit - Split strings honoring escaped separators
• get_uuid - Sortable 22-char unique identifiers for distributed systems
• sign / verify - HMAC-signed payloads with optional expiry, for data that leaves the server and comes back
• smartasync - Unified sync/async API with automatic context detection
• safe_is_instance - isinstance() without importing the class
• tags_match - Boolean expression matcher for tag-based filtering
• dates.parse_period - Natural-language date periods ("mese scorso", "from Q1 to Q2") to a start/end date pair, multilingual

Examples

extract_kwargs Decorator

from genro_toolbox import extract_kwargs

@extract_kwargs(logging=True, cache=True)
def my_function(name, logging_kwargs=None, cache_kwargs=None, **kwargs):
    print(f"logging: {logging_kwargs}")
    print(f"cache: {cache_kwargs}")

my_function(
    "test",
    logging_level="INFO",
    logging_format="json",
    cache_ttl=300,
)
# logging: {'level': 'INFO', 'format': 'json'}
# cache: {'ttl': 300}

metadata Decorator

Stamp keyword arguments as attributes on a function or class:

from genro_toolbox import metadata

@metadata(mixin_order=10)
class Core:
    pass

Core.mixin_order        # 10

@metadata(prefix="rpc", public=True)
def handler():
    pass

handler.rpc_public      # True

safe_is_instance

from genro_toolbox import safe_is_instance

# Check type without importing
safe_is_instance(42, "builtins.int")              # True
safe_is_instance(my_obj, "mypackage.BaseClass")   # True (includes subclasses)

tags_match

from genro_toolbox import tags_match

# Simple tag check
tags_match("admin", {"admin", "user"})  # True

# OR (comma, pipe, or keyword)
tags_match("admin,public", {"public"})  # True
tags_match("admin or public", {"admin"})  # True

# AND (ampersand or keyword)
tags_match("admin&internal", {"admin", "internal"})  # True
tags_match("admin and internal", {"admin"})  # False

# NOT (exclamation or keyword)
tags_match("!admin", {"public"})  # True
tags_match("not admin", {"admin"})  # False

# Complex expressions
tags_match("(admin|public)&!internal", {"admin"})  # True
tags_match("(admin or public) and not internal", {"admin", "internal"})  # False

get_uuid

from genro_toolbox import get_uuid

# Generate sortable unique identifiers
uid = get_uuid()  # e.g., "Z00005KmLxHj7F9aGbCd3e"

len(uid)      # 22 characters
uid[0]        # 'Z' (version marker, sorts after legacy UUIDs)
uid.isalnum() # True (URL-safe)

# IDs are lexicographically sortable by creation time
ids = [get_uuid() for _ in range(3)]
sorted(ids) == ids  # True (already sorted)

sign / verify

Authenticate data that leaves the server and comes back — a payload handed to a client, put in a URL or a cookie, then returned to be acted upon. The key stays server-side: sign on the way out, verify on the way in.

from genro_toolbox import sign, verify, SignatureError, SignatureExpired

token = sign("/srv/data", key=SECRET, expires_in=300)
# 'L3Nydi9kYXRh.MTc4NTMyMzIyMQ.FmMftICRb9MQVrFUwoo9qPCg-R5SYVpKmXA2oXQdmLg'

verify(token, key=SECRET)   # '/srv/data'

Tampering and expiry are both rejected:

try:
    path = verify(token_from_client, key=SECRET)
except SignatureExpired:
    ...   # signature was valid, the token is just too old
except SignatureError:
    ...   # forged, altered, or signed with another key

The token is three base64url fields joined by ., so the payload round-trips byte for byte whatever it contains — separators, unicode, XML-unsafe characters:

payload = '{"exclude": "*.tmp;*.bak"}'
verify(sign(payload, key=SECRET), key=SECRET) == payload  # True

The expiry sits inside the signed area, so it cannot be stripped or extended. Omit expires_in for a token that never expires.

smartasync

from genro_toolbox import smartasync

class DataManager:
    @smartasync
    async def fetch_data(self, url: str):
        async with httpx.AsyncClient() as client:
            return await client.get(url).json()

manager = DataManager()

# Sync context - no await needed!
data = manager.fetch_data("https://api.example.com")

# Async context - use await
async def main():
    data = await manager.fetch_data("https://api.example.com")

# Also works with sync methods in async context (offloaded to thread)
class LegacyProcessor:
    @smartasync
    def cpu_intensive(self, data):
        return process(data)  # Blocking operation

async def main():
    proc = LegacyProcessor()
    result = await proc.cpu_intensive(data)  # Won't block event loop

smartsplit

from genro_toolbox import smartsplit

smartsplit("a.b.c", ".")          # ['a', 'b', 'c']
smartsplit(r"a\.b.c", ".")        # ['a\\.b', 'c']  (escaped separator preserved)
smartsplit("one , two , three", ",")  # ['one', 'two', 'three']  (strips whitespace)

dictExtract

from genro_toolbox import dictExtract

kwargs = {"logging_level": "INFO", "logging_format": "json", "cache_ttl": 300}
dictExtract(kwargs, "logging_")  # {'level': 'INFO', 'format': 'json'}

dates.parse_period

Parses a period written in natural language into a start and an end date, relative to a workdate. Either bound may be None (open period); both None means no filter. Unrecognized text raises PeriodError (a ValueError) carrying value and locale.

from datetime import date
from genro_toolbox.dates import parse_period

wd = date(2026, 4, 15)
parse_period("mese scorso", wd, "it")          # 2026-03-01 .. 2026-03-31
parse_period("oggi-30;", wd, "it")             # 2026-03-16 .. None
parse_period("from january to march", wd, "en")
parse_period("ottobre scorso", wd, "it")       # 2025-10-01 .. 2025-10-31
parse_period("Q1 2024", wd, "en")              # 2024-01-01 .. 2024-03-31
parse_period("10/1/26", wd, "it")              # 2026-01-10 .. 2026-01-10

Supported forms: years, today/oggi with +n/-n, this/last/next week and month, quarters, months with year or last/next, weekdays, ISO and locale dates, ranges with ; or from ... to / dal ... al. The full rules are in the genro_toolbox.dates.period_parser module docstring. Two-digit years use a window around the workdate set by pivot_year (default 20).

Languages live in JSON files (genro_toolbox/dates/locales/it.json, en.json). To add one, write <language>.json with the same keys; pass locale_dir= to load it from your own folder. A missing file or key raises PeriodLocaleError.

Philosophy

If you write a generic helper that could be useful elsewhere, put it in genro-toolbox.

This library serves as the foundation for utilities shared across:

• genro-asgi
• genro-routes
• genro-api
• Other Genro Kyō projects

License

Apache License 2.0 - See LICENSE for details.

Copyright 2025 Softwell S.r.l.