Crate stratify 

Layered configuration for Rust.

Stack configuration from files, environment variables and Azure App Configuration, merge them by declared precedence, and read the result as typed values.

use stratify::ConfigBuilder;

let store = ConfigBuilder::default()
    .json("config/base.json", 100)
    .yaml("config/override.yaml", 50)
    .env("APP_", "__", 10)
    .build()
    .await?;

let host = store.get_str("database.host");

Precedence

Lower priority number wins. A source at priority 10 overrides one at 100. That is the opposite of treating the number as a weight, and it is deliberate: it lets a more specific source be added later without renumbering the ones already there.

Merging is deep. Nested objects combine key by key rather than the higher-precedence source replacing a whole subtree.

Feature flags

• azure — AzureAppConfigSource, reading from Azure App Configuration. Off by default, because it brings in an HTTP stack that a file-and-environment user should not pay for.

Re-exports

pub use builder::ConfigBuilder;

pub use error::ConfigError;

pub use source::Source;

pub use store::ConfigStore;

Modules

builder

Fluent builder for assembling sources into a ConfigStore.

error

Error type returned by loading and lookup.

source

Built-in configuration sources and the Source trait.

store

The merged, cached configuration store.

Macros

file_source

Macro to generate a file-based configuration source.