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// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
use std::{
fs, io,
path::{Path, PathBuf},
process,
time::Duration,
};
use rumqttc::{Client, Connection, MqttOptions};
use serde::Deserialize;
use crate::PROGRAM;
#[derive(Deserialize)]
pub struct Credentials {
pub username: String,
pub password: String,
}
fn default_root() -> PathBuf {
option_env!("DEFAULT_ROOT")
.unwrap_or(&format!("/var/run/{PROGRAM}"))
.into()
}
fn default_host() -> String {
"localhost".to_string()
}
fn default_port() -> u16 {
1883
}
fn default_id() -> String {
PROGRAM.to_string()
}
#[derive(Deserialize)]
pub struct Config {
#[serde(default = "default_root")]
pub root: PathBuf,
#[serde(default = "default_host")]
pub host: String,
#[serde(default = "default_port")]
pub port: u16,
pub credentials: Option<Credentials>,
#[serde(default = "default_id")]
pub id: String,
}
impl Config {
pub fn mqtt_client(&self) -> (Client, Connection) {
let client_id = format!("{}_{}", self.id, process::id());
let mut options = MqttOptions::new(client_id, &self.host, self.port);
if let Some(credentials) = &self.credentials {
options.set_credentials(&credentials.username, &credentials.password);
}
options.set_keep_alive(Duration::from_secs(5));
options.set_max_packet_size(10 * 1024 * 1024, 10 * 1024 * 1024);
Client::new(options, 10)
}
}
pub fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Config> {
let config = match fs::read_to_string(&path) {
Ok(s) => Ok(s),
Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(String::new()),
Err(e) => Err(e),
}?;
Ok(toml::from_str(&config)?)
}
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