commit f06b284b854878f0991ea0fb1cebfc8ee1fefea7
Author: TuDatTr <tuan-dat.tran@tudattr.dev>
Date:   Fri Feb 2 00:10:17 2024 +0100

    Initial commit
    
    Signed-off-by: TuDatTr <tuan-dat.tran@tudattr.dev>

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..3657445
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "echo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.79"
+axum =  {version="0.7.4", features = ["json"]}
+http-body-util = "0.1.0"
+mime = "0.3.17"
+serde = {version ="1.0.195", features = ["derive"]}
+serde_json = "1.0.111"
+tokio = {version = "1.35.1", features = ["full"]}
+tower = "0.4.13"
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..3a26366
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+edition = "2021"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..e0f425c
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,14 @@
+use axum::{
+    routing::{get, post},
+    Router,
+};
+use routes::{echo, root};
+
+pub mod messages;
+pub mod routes;
+
+pub fn app() -> Router {
+    Router::new()
+        .route("/", get(root))
+        .route("/echo", post(echo))
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e1c2b55
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,13 @@
+use anyhow::Error;
+use echo::app;
+use tracing::info;
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    tracing_subscriber::fmt::init();
+    let binding = "0.0.0.0:3000";
+    info!("Creating Axum at: {binding}");
+    let listener = tokio::net::TcpListener::bind(&binding).await?;
+    axum::serve(listener, app()).await?;
+    Ok(())
+}
diff --git a/src/messages.rs b/src/messages.rs
new file mode 100644
index 0000000..af05b4b
--- /dev/null
+++ b/src/messages.rs
@@ -0,0 +1,30 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct EchoRequest {
+    pub src: String,
+    pub dest: String,
+    pub body: BodyRequest,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct BodyRequest {
+    pub r#type: String,
+    pub msg_id: u32,
+    pub echo: String,
+}
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct EchoResponse {
+    pub src: String,
+    pub dest: String,
+    pub body: BodyResponse,
+}
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct BodyResponse {
+    pub r#type: String,
+    pub msg_id: u32,
+    pub in_reply_to: u32,
+    pub echo: String,
+}
diff --git a/src/routes.rs b/src/routes.rs
new file mode 100644
index 0000000..27681c9
--- /dev/null
+++ b/src/routes.rs
@@ -0,0 +1,35 @@
+use axum::{http::StatusCode, Json};
+use tracing::{debug, error};
+
+use crate::messages::{BodyResponse, EchoRequest, EchoResponse};
+
+pub async fn root() -> &'static str {
+    "Hello, World!"
+}
+
+pub async fn echo(Json(payload): Json<EchoRequest>) -> (StatusCode, Json<EchoResponse>) {
+    if payload.body.r#type != "echo" {
+        error!("Error.");
+        return (StatusCode::BAD_REQUEST, Json(EchoResponse::default()));
+    }
+    let response: EchoResponse = {
+        let src = payload.dest;
+        let dest = payload.src;
+        let body = {
+            let r#type = "echo_ok".to_string();
+            let msg_id = payload.body.msg_id;
+            let in_reply_to = payload.body.msg_id;
+            let echo = payload.body.echo;
+            BodyResponse {
+                r#type,
+                msg_id,
+                in_reply_to,
+                echo,
+            }
+        };
+        EchoResponse { src, dest, body }
+    };
+    let json = serde_json::to_string_pretty(&response).unwrap();
+    debug!("Response: {json}");
+    (StatusCode::OK, Json(response))
+}
diff --git a/tests/specification.rs b/tests/specification.rs
new file mode 100644
index 0000000..6b5d130
--- /dev/null
+++ b/tests/specification.rs
@@ -0,0 +1,61 @@
+use axum::http::{self, Request, StatusCode};
+use echo::{
+    app,
+    messages::{BodyRequest, EchoRequest},
+};
+use http_body_util::BodyExt;
+use serde_json::{json, Value};
+use tower::ServiceExt;
+use tracing::info;
+
+#[tokio::test]
+async fn specification() {
+    tracing_subscriber::fmt::init();
+    let request = {
+        let src = "c1".to_string();
+        let dest = "n1".to_string();
+        let r#type = "echo".to_string();
+        let msg_id = 1;
+        let echo = "Please echo 35".to_string();
+        let body = BodyRequest {
+            r#type,
+            msg_id,
+            echo,
+        };
+        EchoRequest { src, dest, body }
+    };
+    let body = serde_json::to_string_pretty(&request).unwrap();
+    info!("Request: {body}");
+
+    let app = app().into_service();
+    let response = app
+        .oneshot(
+            Request::builder()
+                .method(http::Method::POST)
+                .uri("/echo")
+                .header(http::header::CONTENT_TYPE, mime::APPLICATION_JSON.as_ref())
+                .body(serde_json::to_string(&request).unwrap())
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::OK);
+
+    let body = response.into_body().collect().await.unwrap().to_bytes();
+    let body: Value = serde_json::from_slice(&body).unwrap();
+    let expected = json!(
+        {
+            "src": "n1",
+            "dest": "c1",
+            "body": {
+                "type": "echo_ok",
+                "msg_id": 1,
+                "in_reply_to": 1,
+                "echo": "Please echo 35"
+            }
+        }
+    );
+
+    assert_eq!(body, expected);
+}