`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 validated Databricks bundle JSON.
.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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