without-configmap

A without behavior source backed by a Kubernetes ConfigMap mount: the first context that actually changes, proving the context-updated-by-a-stream half of the model end to end. Where without-env loads a static value once, this one re-parses on every mount change.

watch_config(mount, parse) is a Stream that yields the parsed config now and a freshly parsed value every time the mount changes. It watches the mount directory, not the file, so it catches the atomic ..data symlink swap that projected ConfigMaps use. Feed the stream through without.sample to read the latest value as a Context:

from pathlib import Path

from pydantic import BaseModel
from without import sample
from without_configmap import read_yaml_file, watch_config


class MyConfig(BaseModel):
    model_config = {"frozen": True}
    default_mode: str
    max_bytes: int


source = watch_config(Path("/etc/config"), read_yaml_file(MyConfig, "config.yaml"))
async with sample(source) as config:
    config.current()       # always the latest reloaded value, never blocks
    await config.updated() # block until the next reload lands, then return it

See the without-configmap guide (with the API reference) for the full surface.