Merge pull request 'axum-migration' (#1) from axum-migration into main

Reviewed-on: #1

.gitignore

@@ -19,3 +19,4 @@ Cargo.lock
 # Added by cargo
 
 /target
+.idea

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mirror-server"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2021"
 authors = ["Dorian Pula <dorian.pula@amber-penguin-software.ca>"]
 description = "A simple server for mirror HTTP requests for testing."
@@ -16,6 +16,12 @@ section = "web"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-actix-web = "4"
-clap = { version = "4.0", features = ["derive"] }
+axum = "0.7"
+clap = { version = "4.4", features = ["derive"] }
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tokio = { version = "1.36", features = ["macros", "rt-multi-thread"] }
+tower = "0.4"
+tower-http = { version = "0.5", features = ["trace"] }
+tracing = "0.1"
+tracing-subscriber = "0.3"

README.md

@@ -11,13 +11,14 @@ A simple server for mirroring HTTP requests for testing.
 * Create a DEB package:
   * Install cargo-deb: `cargo install cargo-deb`
   * Create the DEB package: `cargo deb`
+* Faster builds using [cargo-watch](https://watchexec.github.io/#cargo-watch): `cargo watch -x run`
 
 ## Install
 
 Download the DEB file, and install it:
 
 ```bash
-VERSION=0.2.0
+VERSION=0.3.0
 REPO_URL=https://code.birch-tree.net/api/packages/dorian/generic/mirror-server/
 curl "${REPO_URL}/${VERSION}/mirror-server_${VERSION}_amd64.deb"
 sudo dpkg -i "mirror-server-${VERSION}_amd64.deb"
@@ -25,6 +26,8 @@ sudo dpkg -i "mirror-server-${VERSION}_amd64.deb"
 
 ## TODO
 
-* [ ] Add logging to server.
+* [x] Migrate actix to axum for easier maintainability.
+* [x] Add mirroring of JSON request.
+* [x] Add logging to server.
 * [ ] Add convenience path to access logging for a certain date / records.
 * [ ] Dockerize mirror-server for easier distribution.

src/main.rs

@@ -1,7 +1,14 @@
-use actix_web::{web::Json, App, HttpRequest, HttpServer, Responder};
+use axum::{
+    extract::{Host, OriginalUri, Json},
+    http::{header::HeaderMap, Method},
+    Router,
+};
 use clap::Parser;
 use serde::Serialize;
+use serde_json::Value;
 use std::collections::BTreeMap;
+use tower_http::trace;
+use tracing::{Level, info, warn};
 
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
@@ -15,50 +22,69 @@ struct CliArgs {
     ips: String,
 }
 
-#[derive(Serialize)]
-struct EchoHeader {
-    name: String,
-    value: String,
-}
-
 #[derive(Serialize)]
 struct EchoResponse {
     method: String,
     path: String,
     host: String,
     headers: BTreeMap<String, String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    body: Option<Value>,
 }
 
-impl EchoResponse {
-    fn new(req: &HttpRequest) -> Self {
-        let req_uri = req.uri();
-        let mut headers = BTreeMap::new();
-        for (header_name, header_value) in req.headers().iter() {
-            headers.insert(
-                header_name.to_string(),
-                header_value.to_str().unwrap_or("ERROR").to_string(),
-            );
-        }
-        EchoResponse {
-            method: req.method().to_string(),
-            path: req_uri.path().to_string(),
-            host: req_uri.host().unwrap_or("").to_string(),
-            headers,
-        }
-    }
+async fn echo_request(
+    method: Method,
+    original_uri: OriginalUri,
+    host: Host,
+    header_map: HeaderMap,
+    body: Option<Json<Value>>
+) -> Json<EchoResponse> {
+    let method = method.to_string();
+    let host = host.0;
+    let path = original_uri.path().to_string();
+    let headers = header_map
+        .iter()
+        .map(|(name, value)| (name.to_string(), value.to_str().unwrap_or("").to_string()))
+        .collect();
+
+    let json_body = match body {
+        None => {
+            warn!("Received a non-JSON body.");
+            None
+        },
+        Some(Json(value)) => Some(value),
+    };
+    let response = EchoResponse {
+        method,
+        host,
+        path,
+        headers,
+        body: json_body,
+    };
+    Json(response)
 }
 
-async fn echo_request(request: HttpRequest) -> actix_web::Result<impl Responder> {
-    let echo = EchoResponse::new(&request);
-    Ok(Json(echo))
-}
-
-#[actix_web::main]
-async fn main() -> std::io::Result<()> {
+#[tokio::main]
+async fn main() {
     let cli_args = CliArgs::parse();
     let listen_on = (cli_args.ips, cli_args.port);
-    HttpServer::new(|| App::new().default_service(actix_web::web::route().to(echo_request)))
-        .bind(listen_on)?
-        .run()
+    let listen_on = format!("{ip}:{port}", ip = listen_on.0, port = listen_on.1);
+
+    // From https://stackoverflow.com/questions/75009289/how-to-enable-logging-tracing-with-axum
+    tracing_subscriber::fmt()
+        .with_max_level(Level::INFO)
+        .init();
+    let app = Router::new().fallback(echo_request).layer(
+        trace::TraceLayer::new_for_http()
+            .make_span_with(trace::DefaultMakeSpan::new().level(Level::INFO))
+            .on_response(trace::DefaultOnResponse::new().level(Level::INFO)),
+    );
+
+    info!("Starting the mirror-server to listen to {}", listen_on);
+    let listener = tokio::net::TcpListener::bind(&listen_on)
         .await
+        .unwrap_or_else(|_| panic!("Failed to binding to {}", listen_on));
+    axum::serve(listener, app)
+        .await
+        .expect("Server should start");
 }