use lazy_static::lazy_static; use log::*; use serde::{Deserialize, Serialize}; use std::sync::RwLock; // initialize a singleton default configuration lazy_static! { pub static ref SETTINGS: RwLock = RwLock::new(Settings::default()); } #[derive(Debug, Serialize, Deserialize)] #[allow(unused)] pub struct Network { pub port: u16, pub address: String, } // #[derive(Debug, Serialize, Deserialize)] #[allow(unused)] pub struct Options { pub reject_future_seconds: Option, // if defined, reject any events with a timestamp more than X seconds in the future } #[derive(Debug, Serialize, Deserialize)] #[allow(unused)] pub struct Retention { // TODO: implement pub max_events: Option, // max events pub max_bytes: Option, // max size pub persist_days: Option, // oldest message pub whitelist_addresses: Option>, // whitelisted addresses (never delete) } #[derive(Debug, Serialize, Deserialize)] #[allow(unused)] pub struct Limits { pub messages_per_sec: Option, // Artificially slow down event writing to limit disk consumption (averaged over 1 minute) pub max_event_bytes: Option, pub max_ws_message_bytes: Option, pub max_ws_frame_bytes: Option, pub broadcast_buffer: usize, // events to buffer for subscribers (prevents slow readers from consuming memory) pub event_persist_buffer: usize, // events to buffer for database commits (block senders if database writes are too slow) } #[derive(Debug, Serialize, Deserialize)] #[allow(unused)] pub struct Settings { pub network: Network, pub limits: Limits, pub retention: Retention, pub options: Options, } impl Settings { pub fn new() -> Self { let d = Self::default(); // attempt to construct settings with file // Self::new_from_default(&d).unwrap_or(d) let from_file = Self::new_from_default(&d); match from_file { Ok(f) => f, Err(e) => { warn!("Error reading config file ({:?})", e); d } } } fn new_from_default(default: &Settings) -> Result { let config: config::Config = config::Config::new(); let settings: Settings = config // use defaults .with_merged(config::Config::try_from(default).unwrap())? // override with file contents .with_merged(config::File::with_name("config"))? .try_into()?; Ok(settings) } } impl Default for Settings { fn default() -> Self { Settings { network: Network { port: 8080, address: "0.0.0.0".to_owned(), }, limits: Limits { messages_per_sec: None, max_event_bytes: Some(2 << 17), // 128K max_ws_message_bytes: Some(2 << 17), // 128K max_ws_frame_bytes: Some(2 << 17), // 128K broadcast_buffer: 4096, event_persist_buffer: 16, }, retention: Retention { max_events: None, // max events max_bytes: None, // max size persist_days: None, // oldest message whitelist_addresses: None, // whitelisted addresses (never delete) }, options: Options { reject_future_seconds: Some(30 * 60), // Reject events 30min in the future or greater }, } } }