feat(backend): add .env support and configuration priority

Cargo.lock

@@ -250,6 +250,7 @@ dependencies = [
  "axum",
  "bytes",
  "clap",
+ "dotenvy",
  "futures",
  "mime_guess",
  "quick-xml",
@@ -257,6 +258,7 @@ dependencies = [
  "serde",
  "serde_json",
  "shared",
+ "thiserror 2.0.18",
  "tokio",
  "tokio-stream",
  "tokio-util",
@@ -616,6 +618,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
 [[package]]
 name = "drain_filter_polyfill"
 version = "0.1.3"
@@ -835,7 +843,7 @@ dependencies = [
  "pin-project",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 1.0.69",
  "wasm-bindgen",
  "wasm-bindgen-futures",
  "web-sys",
@@ -856,7 +864,7 @@ dependencies = [
  "pin-project",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 1.0.69",
  "wasm-bindgen",
  "wasm-bindgen-futures",
  "web-sys",
@@ -1239,7 +1247,7 @@ dependencies = [
  "config",
  "regex",
  "serde",
- "thiserror",
+ "thiserror 1.0.69",
  "typed-builder",
 ]
 
@@ -1334,7 +1342,7 @@ dependencies = [
  "serde-wasm-bindgen",
  "serde_json",
  "slotmap",
- "thiserror",
+ "thiserror 1.0.69",
  "tracing",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -1360,7 +1368,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_qs 0.13.0",
- "thiserror",
+ "thiserror 1.0.69",
  "tracing",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -1379,7 +1387,7 @@ dependencies = [
  "leptos_reactive",
  "serde",
  "server_fn",
- "thiserror",
+ "thiserror 1.0.69",
  "tracing",
 ]
 
@@ -1542,7 +1550,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c51ebcefb2f0b9a5e0bea115532c8ae4215d1b01eff176d0f4ba4192895c2708"
 dependencies = [
  "serde",
- "thiserror",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -1884,7 +1892,7 @@ dependencies = [
  "quote",
  "syn",
  "syn_derive",
- "thiserror",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -2042,7 +2050,7 @@ checksum = "0431a35568651e363364210c91983c1da5eb29404d9f0928b67d4ebcfa7d330c"
 dependencies = [
  "percent-encoding",
  "serde",
- "thiserror",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -2053,7 +2061,7 @@ checksum = "cd34f36fe4c5ba9654417139a9b3a20d2e1de6012ee678ad14d240c22c78d8d6"
 dependencies = [
  "percent-encoding",
  "serde",
- "thiserror",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -2106,7 +2114,7 @@ dependencies = [
  "serde_json",
  "serde_qs 0.12.0",
  "server_fn_macro_default",
- "thiserror",
+ "thiserror 1.0.69",
  "url",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -2298,7 +2306,16 @@ version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 1.0.69",
+]
+
+[[package]]
+name = "thiserror"
+version = "2.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
+dependencies = [
+ "thiserror-impl 2.0.18",
 ]
 
 [[package]]
@@ -2312,6 +2329,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "thiserror-impl"
+version = "2.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.9"
@@ -2583,7 +2611,7 @@ dependencies = [
  "log",
  "rand",
  "sha1",
- "thiserror",
+ "thiserror 1.0.69",
  "utf-8",
 ]
 

backend/.env.example

@@ -0,0 +1,5 @@
+# rTorrent SCGI Socket Path
+RTORRENT_SOCKET=/tmp/rtorrent.sock
+
+# Backend Listen Port
+PORT=3000

backend/Cargo.toml

@@ -23,3 +23,4 @@ rust-embed = "8.2"
 mime_guess = "2.0"
 shared = { path = "../shared" }
 thiserror = "2.0.18"
+dotenvy = "0.15.7"

backend/src/main.rs

@@ -10,6 +10,7 @@ use axum::{
     Router,
 };
 use clap::Parser;
+use dotenvy::dotenv;
 use shared::{AppEvent, Torrent};
 use std::net::SocketAddr;
 use std::sync::Arc;
@@ -33,16 +34,24 @@ pub struct AppState {
 #[command(author, version, about, long_about = None)]
 struct Args {
     /// Path to rTorrent SCGI socket
-    #[arg(short, long, default_value = "/tmp/rtorrent.sock")]
+    #[arg(
+        short,
+        long,
+        env = "RTORRENT_SOCKET",
+        default_value = "/tmp/rtorrent.sock"
+    )]
     socket: String,
 
     /// Port to listen on
-    #[arg(short, long, default_value_t = 3000)]
+    #[arg(short, long, env = "PORT", default_value_t = 3000)]
     port: u16,
 }
 
 #[tokio::main]
 async fn main() {
+    // Load .env file
+    let _ = dotenv();
+
     // initialize tracing with env filter (default to info)
     tracing_subscriber::fmt()
         .with_env_filter(