Add support for environment files

central_backend/Cargo.lock

@@ -670,6 +670,7 @@ dependencies = [
  "bincode",
  "chrono",
  "clap",
+ "dotenvy",
  "env_logger",
  "foreign-types-shared",
  "fs4",
@@ -997,6 +998,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
 [[package]]
 name = "encode_unicode"
 version = "1.0.0"

central_backend/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 log = "0.4.22"
 env_logger = "0.11.5"
 lazy_static = "1.5.0"
+dotenvy = "0.15.7"
 clap = { version = "4.5.20", features = ["derive", "env"] }
 anyhow = "1.0.89"
 thiserror = "1.0.64"

central_backend/src/app_config.rs

@@ -48,6 +48,10 @@ pub enum ConsumptionBackend {
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 pub struct AppConfig {
+    /// Read arguments from env file
+    #[clap(short, long, env)]
+    pub config: Option<String>,
+
     /// Proxy IP, might end with a star "*"
     #[clap(short, long, env)]
     pub proxy_ip: Option<String>,
@@ -114,6 +118,21 @@ lazy_static::lazy_static! {
 }
 
 impl AppConfig {
+    /// Parse environment variables from file, if requedst
+    pub fn parse_env_file() -> anyhow::Result<()> {
+        if let Some(c) = Self::parse().config {
+            log::info!("Load additional environment variables from {c}");
+            let conf_file = Path::new(&c);
+
+            if !conf_file.is_file() {
+                panic!("Specified configuration is not a file!");
+            }
+            dotenvy::from_path(conf_file)?;
+        }
+
+        Ok(())
+    }
+
     /// Get parsed command line arguments
     pub fn get() -> &'static AppConfig {
         &ARGS

central_backend/src/main.rs

@@ -9,6 +9,9 @@ use tokio_schedule::{every, Job};
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
+    // Load additional config from file, if requested
+    AppConfig::parse_env_file().expect("Failed to parse environment file!");
+
     // Initialize OpenSSL
     openssl_sys::init();