Module apollo_framework::config

Contains the system configuration.

Provides access to the system configuration which is loaded from the config/settings.yml file. Note that we observe this file for changes and reload it once a change is detected. Therefore each user of the config should attach itself to the Config::notifier and re-process the config once a change message is received.

Being an in-memory database framework we want to prevent restarts / downtimes as much as possible.

Note that the Config struct is kind of constant and can be obtained from the Platform once and then kept around. However, when using Config::current() to obtain the current config handle, this should not be stored, as it will not be updated once a new config has been loaded.

Examples

Obtaining and reading the config:

// Create a platform and install the config...
let platform = Platform::new();
let config = config::install(platform.clone(), false).await;

// Fetch the current config document (might be reloaded from time to time) and read the
// selected server port..
let port = config.current().config()["server"]["port"].as_i64().unwrap_or(1234);

Attaching a change listener:

// Create a platform and install the config...
let platform = Platform::new();
let config = config::install(platform.clone(), false);

// Obtain the config...
let config = platform.require::<Config>();
tokio::spawn(async move {
    loop {
        // Wait for a config change. This will most probably be combined with a read from
        // a command queue or another feature using tokio::select!...
        match config.notifier().recv().await {
            Ok(_) => log::info!("Config update received..."),
            _ => return,
        }       
    }
});

Structs

Config	Provides access to the system configuration.
Handle	Represents a handle to the currently loaded configuration.

Functions

install

Creates an installs a Config for the given platform.

Type Definitions

ChangeNotifier

Represents the change listener.