`dbx-tools-core`

Dependency-free Python configuration and identity helpers shared by dbx-tools packages.

Install from PyPI:

pip install dbx-tools-core

To install the current main branch directly from the repository instead:

pip install "dbx-tools-core @ git+https://github.com/reggie-db/dbx-tools.git@main#subdirectory=packages/py/core"

Key features

config.text() resolves scoped keys from the process environment, then the nearest project .env file, then the single App's config.env in validated Databricks bundle JSON. Root bundle variables are not a config source: they are authoring inputs interpolated into the bundle's own targets, resources, and paths, so reading one as a process setting resolves names the deployed App never sees. Reference a variable from config.env to make it one.
.env.<NODE_ENV> wins over .env, with production/prod and development/dev treated as aliases.
Bundle validation stays lazy: the Databricks CLI runs only after environment and dotenv lookup miss. Dotenv files and bundle results are each loaded once per resolved working-directory context.
Deployed Databricks Apps skip local files and bundle validation because the platform has already populated real environment variables.
DBX_TOOLS_DATABRICKS_APP_ENV=true or false forces Databricks App runtime detection; absent or unrecognized values retain automatic detection.
DBX_TOOLS_CONFIG_DOTENV and DBX_TOOLS_CONFIG_BUNDLE independently force each local source on or off, overriding the usual deployed-App skip.
Bundle reads default off when NODE_ENV=production unless DBX_TOOLS_CONFIG_BUNDLE=true explicitly enables them.
String, boolean, positive-number, positive-integer, and list helpers use the same loose configuration coercions as @dbx-tools/core.
Stable-key, FNV hash, and identifier functions preserve deterministic Node and Python identity contracts.

Quick start

from dbx_tools.core import config

host = config.text("HOST", {"prefix": "SMTP"})
port = config.positive_int(None, "PORT", 587, {"prefix": "SMTP"})

The default key order for HOST with prefix SMTP is DBX_TOOLS_SMTP_HOST, SMTP_HOST, then HOST. Pass config.ENV_ONLY when a caller must read the exact process environment without local file fallbacks. config.is_databricks_app_env() validates the App name, HTTP(S) workspace host, and TCP port unless config.DATABRICKS_APP_ENV_KEY names a recognized boolean override in the environment. config.CONFIG_DOTENV_KEY and config.CONFIG_BUNDLE_KEY name the equivalent per-source overrides. Recognized booleans win; absent or unrecognized values read files outside a Databricks App and skip them inside one. Bundle validation also stays off by default in production.

Modules

config — layered environment, dotenv, and Databricks bundle configuration;
hash.fnv_hash() — the single-string subset of TypeScript fnvHashWithOptions, including UTF-16 code-unit hashing and base-32 output;
object.to_stable_key() — strict structured identity canonicalization;
string.to_identifier() — readable identifier tokenization, with the same hyphen default as TypeScript and an explicit delimiter override for consumers such as the underscore-delimited Postgres bus channel.

The identity functions exist so Python packages do not copy the TypeScript algorithms locally and silently drift. Their shared behavior is tested from packages/test/polyglot/fixtures/core/fixture.json. Configuration precedence, dotenv discovery/parsing, bundle fallback, laziness, and cache behavior are shared fixtures under packages/test/polyglot/fixtures/core/config.

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