feat(config): add dotenv for environment variables (dev-sys-do#8)

* refactor: remove unused import of E constant

* feat(dependencies): add dotenv crate for environment variable management

* feat(gitignore): add entry to ignore environment variable files

* feat(config): add configuration struct and load from environment variables

Author: jorisvilardell

.env.example

@@ -0,0 +1,3 @@
+FERRIS_BASE_PATH=./public
+FERRIS_PORT=9000
+FERRIS_HOST=0.0.0.0

.gitignore

@@ -26,3 +26,5 @@ target
 /target
 
 public/
+
+.*env

Cargo.lock

@@ -8,6 +8,7 @@ async-trait = "0.1.89"
 clap = { version = "4.5.50", features = ["derive"] }
 tokio = { version = "1", features = ["net", "rt-multi-thread", "rt", "fs", "io-util", "sync", "macros"] }
 anyhow = "1.0"
+dotenv = "0.15.0"
 
 [[bin]]
 name = "cli"

Cargo.toml

@@ -0,0 +1,23 @@
+#[derive(Debug)]
+pub struct Config {
+    pub ferris_base_path: String,
+    pub ferris_port: u16,
+    pub ferris_host: String,
+}
+
+impl Config {
+    pub fn from_env() -> Self {
+        let ferris_base_path =
+            std::env::var("FERRIS_BASE_PATH").unwrap_or_else(|_| "./public".to_string());
+        let ferris_port = std::env::var("FERRIS_PORT")
+            .unwrap_or_else(|_| "9000".to_string())
+            .parse()
+            .expect("FERRIS_PORT must be a valid u16");
+        let ferris_host = std::env::var("FERRIS_HOST").unwrap_or_else(|_| "127.0.0.1".to_string());
+        Config {
+            ferris_base_path,
+            ferris_port,
+            ferris_host,
+        }
+    }
+}

src/application/config.rs

@@ -1 +1,2 @@
+pub mod config;
 pub mod ferrisshare_state;

src/application/mod.rs

@@ -1,4 +1,3 @@
-use std::f32::consts::E;
 use std::io::Error;
 use std::sync::Arc;
 use std::sync::atomic::AtomicBool;

src/core/domain/network/services.rs

@@ -1,8 +1,10 @@
+use dotenv::dotenv;
 use std::sync::Arc;
 
 use tokio::{net::TcpStream, sync::mpsc};
 
 use ferrisshare::{
+    application::config::Config,
     core::domain::{
         command::services::CommandServiceImpl,
         network::{ports::NetworkService as _, services::NetworkServiceImpl},
@@ -12,9 +14,12 @@ use ferrisshare::{
 
 #[tokio::main]
 async fn main() -> tokio::io::Result<()> {
+    dotenv().ok();
+    let cfg: Config = Config::from_env();
+
     let (tx, rx) = mpsc::channel::<TcpStream>(1);
 
-    let storage_repo = FSStorageRepository::new("./public/".into());
+    let storage_repo = FSStorageRepository::new(cfg.ferris_base_path);
 
     let command_service = CommandServiceImpl::new(storage_repo);
     let network_service = NetworkServiceImpl::new(command_service);
@@ -36,7 +41,10 @@ async fn main() -> tokio::io::Result<()> {
 
     if let Err(e) = ferrisshare_state
         .network_service
-        .listener("127.0.0.1:9000", tx)
+        .listener(
+            format!("{}:{}", cfg.ferris_host, cfg.ferris_port).as_str(),
+            tx,
+        )
         .await
     {
         eprintln!("Listener error: {:?}", e);