cfgio 1.0.2

Unified async JSON/YAML config I/O with routed access for files and in-memory data, featuring atomic saves and thread-offloaded parsing.

ConfigIO ⚙️

configio provides a single, loader‑driven API that can either work on files (FILE mode) or on in‑memory Python documents (DATA mode). Nested access and updates are addressed using pyroute.Route. Parsing and persistence are delegated to lightweight backends (configio.jsonio, configio.yamlio) that perform best‑effort atomic writes.

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Features ✨

• Two loaders, one API: operate on disk (loader=FILE) or on in‑memory objects (loader=DATA) with the same methods.
• Routed access: immutable, hashable paths via Route("a", "b", "c").
• Async I/O: all entry points are async.
• Thread offload: threadsafe=True offloads heavy parse/dump to a worker thread (primarily useful in FILE mode).
• Atomic saves: temp‑file + os.replace(...) pattern under the hood.
• Strict codec: codec is explicit (Codec.JSON or Codec.YAML)—no extension inference.

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Installation 📦

pip install cfgio -U

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Quick Start 🚀

import asyncio
from configio import ConfigIO, Loader, Codec, Route
# Also you can import Route from pyroute package


async def main():
    # --- FILE mode (read from / write to disk) ---
    value = await ConfigIO.get(
        loader=Loader.FILE,
        codec=Codec.YAML,
        path="config.yml",
        route=Route("server", "port"),
    )
    print("server.port:", value)

    updated = await ConfigIO.set(
        loader=Loader.FILE,
        codec=Codec.JSON,
        path="config.json",
        route=Route("features", "beta"),
        value=True,
        overwrite_conflicts=True,  # create/overwrite missing/non-mapping parents as {}
        save=True,  # persist to disk
        threadsafe=True,  # offload parse/dump
    )
    print("updated FILE doc:", updated)

    # --- DATA mode (operate on an in-memory document) ---
    doc = {"app": {"theme": "light", "lang": "en"}}

    # Update in memory only
    doc = await ConfigIO.set(
        loader=Loader.DATA,
        data=doc,
        codec=Codec.YAML,
        route=Route("app", "theme"),
        value="dark",
        save=False,  # do NOT persist
    )

    # Optionally persist DATA mode to disk
    doc = await ConfigIO.set(
        loader=Loader.DATA,
        data=doc,
        codec=Codec.YAML,
        path="app.yml",
        route=Route("app", "lang"),
        value="fa-IR",
        save=True,  # requires path when loader=DATA
    )

    # Delete with drop semantics
    doc = await ConfigIO.delete(
        loader=Loader.DATA,
        data=doc,
        codec=Codec.YAML,
        route=Route("app", "theme"),
        drop=True,  # prune empty parents bottom-up
        save=False,
    )
    print("after delete:", doc)


if __name__ == "__main__":
    asyncio.run(main())

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Routing Cheatsheet 🧭

from pyroute import Route

Route("a")                # ["a"]
Route("a", "b", "c")      # ["a"]["b"]["c"]
# Use hashable keys (strings, ints...) to traverse mapping-only structures.

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Path Types 🛣️

PathType = Union[str, os.PathLike[str]]
At runtime, both plain strings and os.PathLike instances are accepted and validated.

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Example Configs 📄

YAML

server:
  host: 127.0.0.1
  port: 8080
features:
  beta: false

JSON

{
  "server": { "host": "127.0.0.1", "port": 8080 },
  "features": { "beta": false }
}

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License 📝

This project is licensed under the MIT License – see the LICENSE file for details.

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Acknowledgements 🙏

• pyroute for clean route semantics.