feat: add print default config cmd

src/main.rs

@@ -1,8 +1,8 @@
 use crate::middleware::auth;
 use axum::{http::Method, Router};
 use clap::Parser;
-use sea_orm::{Database, DatabaseConnection};
-use serde::Deserialize;
+use sea_orm::{Database, DatabaseConnection, Iden};
+use serde::{Deserialize, Serialize};
 use tower::ServiceBuilder;
 use tower_http::cors::{Any, CorsLayer};
 use tower_http::trace::TraceLayer;
@@ -18,7 +18,7 @@ mod query;
 
 #[tokio::main]
 async fn main() {
-    dotenvy::dotenv().unwrap();
+    // dotenvy::dotenv().unwrap();
     // initialize tracing
     tracing_subscriber::registry()
         .with(tracing_subscriber::fmt::layer())
@@ -35,6 +35,9 @@ async fn main() {
                 eprintln!("Failed to load config from {}", config_path);
             }
         }
+        Command::PrintExampleConfig {}=>{
+            print_default_config().await;
+        }
     }
 }
 
@@ -43,23 +46,23 @@ struct AppState {
     conn: DatabaseConnection,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize,Serialize)]
 struct Key {
     jwt: String,
     user: String,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize,Serialize)]
 struct DatabaseConf {
     connection: String,
 }
-#[derive(Deserialize)]
+#[derive(Deserialize,Serialize)]
 struct ServiceConf {
     host: String,
     port: u32,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize,Serialize)]
 struct Config {
     service: ServiceConf,
     database: DatabaseConf,
@@ -78,6 +81,7 @@ enum Command {
         #[arg(long = "conf")]
         config_path: String,
     },
+    PrintExampleConfig {},
 }
 async fn load_config(path: &str) -> Result<Config, Box<dyn std::error::Error>> {
     let content = tokio::fs::read_to_string(path).await?;
@@ -118,3 +122,22 @@ async fn start_server(config: &Config) {
         .await
         .expect("Service panic happened");
 }
+
+async fn print_default_config() {
+    let example_conf = Config{
+        service: ServiceConf {
+            host: "localhost".to_string(),
+            port: 8080,
+        },
+        database: DatabaseConf {
+            connection: "postgres://postgres:postgres@localhost/test_db".to_string(),
+        },
+        keys: Key {
+            jwt: "THIS_IS_TEST_CONFIG".to_string(),
+            user: "test_user".to_string(),
+        },
+    };
+    // 序列化为 TOML 字符串
+    let toml_string = toml::to_string(&example_conf);
+    println!("#This is an example config.\n{}", toml_string.unwrap());
+}