- add: api service gateway to allow website logins

api-service/Cargo.toml

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+[package]
+name = "api-service"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = "0.7.9"
+hyper = { version = "1.5.1", features = ["server"] }
+prost = "0.13.4"
+serde = { version = "1.0.216", features = ["derive"] }
+serde_json = "1.0.133"
+tokio = { version = "1.42.0", features = ["full"] }
+tonic = { version = "0.12.3", features = ["transport", "prost"] }
+tower = "0.5.2"
+log = "0.4.22"
+tracing = "0.1.41"
+tracing-subscriber = "0.3.19"
+utils = { path = "../utils" }
+dotenv = "0.15"
+tower-http = { version = "0.6.2", features = ["cors"] }
+
+[build-dependencies]
+tonic-build = "0.12.3"

api-service/build.rs

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+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::configure()
+        .compile_well_known_types(true)
+        .compile_protos(&["../proto/auth.proto"], &["../proto"])?;
+    Ok(())
+}

api-service/src/axum_gateway.rs

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+use axum::extract::State;
+use axum::{routing::post, Json, Router};
+use serde::{Deserialize, Serialize};
+use std::env;
+use std::sync::Arc;
+use axum::http::Method;
+use tonic::transport::Channel;
+use tower_http::cors::{Any, CorsLayer};
+
+use auth::auth_service_client::AuthServiceClient;
+use auth::LoginRequest;
+use log::error;
+use tokio::sync::Mutex;
+
+pub mod auth {
+    tonic::include_proto!("auth");
+}
+
+#[derive(Serialize, Deserialize)]
+struct RestLoginRequest {
+    username: String,
+    password: String,
+}
+
+#[derive(Serialize, Deserialize)]
+struct RestLoginResponse {
+    token: String,
+}
+
+async fn login_handler(
+    State(grpc_client): State<Arc<Mutex<AuthServiceClient<Channel>>>>,
+    Json(payload): Json<RestLoginRequest>,
+) -> Result<Json<RestLoginResponse>, axum::http::StatusCode> {
+    let request = tonic::Request::new(LoginRequest {
+        username: payload.username.clone(),
+        password: payload.password.clone(),
+    });
+
+    let mut client = grpc_client.lock().await; // Lock the mutex to get mutable access
+    match client.login(request).await {
+        Ok(response) => {
+            let token = response.into_inner().token;
+            Ok(Json(RestLoginResponse { token }))
+        }
+        Err(e) => {
+            error!("gRPC Login call failed: {}", e);
+            Err(axum::http::StatusCode::UNAUTHORIZED)
+        }
+    }
+}
+
+pub async fn serve_rest_api(
+    grpc_client: Arc<Mutex<AuthServiceClient<Channel>>>,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let cors = CorsLayer::new()
+        .allow_origin(Any) // Allow requests from any origin
+        .allow_methods([Method::GET, Method::POST]) // Allow specific methods
+        .allow_headers(Any); // Allow any headers
+
+    let app = Router::new()
+        .route("/api/login", post(login_handler))
+        .with_state(grpc_client)
+        .layer(cors);
+
+    let addr = env::var("LISTEN_ADDR").unwrap_or_else(|_| "127.0.0.1".to_string());
+    let port = env::var("API_SERVICE_PORT").unwrap_or_else(|_| "50050".to_string());
+    let listener = tokio::net::TcpListener::bind(format!("{}:{}", addr, port))
+        .await
+        .unwrap();
+    axum::serve(listener, app.into_make_service())
+        .await
+        .unwrap();
+
+    Ok(())
+}

api-service/src/main.rs

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+use crate::axum_gateway::auth::auth_service_client::AuthServiceClient;
+use dotenv::dotenv;
+use std::collections::HashMap;
+use std::env;
+use std::str::FromStr;
+use std::sync::Arc;
+use tokio::sync::Mutex;
+use tokio::{select, signal};
+use tracing::{info, Level};
+use utils::consul_registration;
+use utils::service_discovery::get_service_address;
+
+mod axum_gateway;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    dotenv().ok();
+    tracing_subscriber::fmt()
+        .with_max_level(
+            Level::from_str(&env::var("LOG_LEVEL").unwrap_or_else(|_| "info".to_string()))
+                .unwrap_or_else(|_| Level::INFO),
+        )
+        .init();
+
+    // Set the gRPC server address
+    let addr = env::var("API_SERVICE_ADDR").unwrap_or_else(|_| "127.0.0.1".to_string());
+    let port = env::var("API_SERVICE_PORT").unwrap_or_else(|_| "50050".to_string());
+    let health_port = env::var("HEALTH_CHECK_PORT").unwrap_or_else(|_| "8079".to_string());
+
+    let consul_url = env::var("CONSUL_URL").unwrap_or_else(|_| "http://127.0.0.1:8500".to_string());
+    let service_name = env::var("SERVICE_NAME").unwrap_or_else(|_| "api-service".to_string());
+    let service_address = addr.as_str();
+    let service_port = port.clone();
+    let health_check_url = format!("http://{}:{}/health", service_address, health_port);
+
+    // Register service with Consul
+    let service_id = consul_registration::generate_service_id();
+    let tags = vec!["version-1.0".to_string()];
+    let meta = HashMap::new();
+    consul_registration::register_service(
+        &consul_url,
+        service_id.as_str(),
+        service_name.as_str(),
+        service_address,
+        service_port.parse().unwrap_or(50050),
+        tags,
+        meta,
+        &health_check_url,
+    )
+    .await?;
+
+    // Start health-check endpoint
+    consul_registration::start_health_check(addr.as_str()).await?;
+
+    let auth_node = get_service_address(&consul_url, "auth-service").await?;
+    let auth_address = auth_node.get(0).unwrap();
+    let auth_service_address = format!(
+        "http://{}:{}",
+        auth_address.ServiceAddress, auth_address.ServicePort
+    );
+
+    // Connect to the gRPC auth-service
+    let grpc_client = AuthServiceClient::connect(auth_service_address.to_string()).await?;
+    let grpc_client = Arc::new(Mutex::new(grpc_client));
+
+    // Start the Axum REST API
+    info!("Starting REST API on 0.0.0.0:8079");
+    axum_gateway::serve_rest_api(grpc_client).await?;
+
+    select! {
+        _ = signal::ctrl_c() => {},
+    }
+
+    consul_registration::deregister_service(&consul_url, service_id.as_str())
+        .await
+        .expect("");
+    info!("service {} deregistered", service_name);
+    Ok(())
+}