From e681eb91cd8293cefed983e2a877ab99813ae1c5 Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Sat, 25 Dec 2021 20:30:09 +0100
Subject: implement webserver backend

---
 planetwars-localdev/README.md      |   1 +
 planetwars-localdev/src/lib.rs     |  14 +++++
 planetwars-localdev/src/web/mod.rs | 123 +++++++++++++++++++++++++++++++++++++
 3 files changed, 138 insertions(+)
 create mode 100644 planetwars-localdev/src/web/mod.rs

diff --git a/planetwars-localdev/README.md b/planetwars-localdev/README.md
index 3263508..72572d2 100644
--- a/planetwars-localdev/README.md
+++ b/planetwars-localdev/README.md
@@ -7,3 +7,4 @@ Tools for developping planetwars bots locally.
 1. Initialize your project directory: `pwcli init-project my_project`
 2. Enter your fresh project: `cd my_project`
 3. Run an example match: `pwcli run-match hex simplebot simplebot`
+4. View your match in the web UI: `pwcli serve`
diff --git a/planetwars-localdev/src/lib.rs b/planetwars-localdev/src/lib.rs
index 562e9a6..c64fb55 100644
--- a/planetwars-localdev/src/lib.rs
+++ b/planetwars-localdev/src/lib.rs
@@ -26,6 +26,8 @@ enum Commands {
     InitProject(InitProjectCommand),
     /// Run a match
     RunMatch(RunMatchCommand),
+    /// Host local webserver
+    Serve(ServeCommand),
 }
 
 #[derive(Parser)]
@@ -42,6 +44,9 @@ struct InitProjectCommand {
     path: String,
 }
 
+#[derive(Parser)]
+struct ServeCommand;
+
 #[derive(Serialize, Deserialize, Debug)]
 struct ProjectConfig {
     bots: HashMap<String, BotConfig>,
@@ -58,6 +63,7 @@ pub async fn run() {
     let res = match matches.command {
         Commands::RunMatch(command) => run_match(command).await,
         Commands::InitProject(command) => init_project(command),
+        Commands::Serve(_) => run_webserver().await,
     };
     if let Err(err) = res {
         eprintln!("{}", err);
@@ -139,3 +145,11 @@ fn init_project(command: InitProjectCommand) -> io::Result<()> {
 
     Ok(())
 }
+
+mod web;
+async fn run_webserver() -> io::Result<()> {
+    let project_dir = env::current_dir().unwrap();
+
+    web::run(project_dir).await;
+    Ok(())
+}
diff --git a/planetwars-localdev/src/web/mod.rs b/planetwars-localdev/src/web/mod.rs
new file mode 100644
index 0000000..a5d0989
--- /dev/null
+++ b/planetwars-localdev/src/web/mod.rs
@@ -0,0 +1,123 @@
+use axum::{
+    body::{boxed, Full},
+    extract::{Extension, Path},
+    handler::Handler,
+    http::{header, StatusCode, Uri},
+    response::{IntoResponse, Response},
+    routing::{get, Router},
+    AddExtensionLayer, Json,
+};
+use mime_guess;
+use rust_embed::RustEmbed;
+use serde::{Deserialize, Serialize};
+use std::{
+    net::SocketAddr,
+    path::{self, PathBuf},
+    sync::Arc,
+};
+
+struct State {
+    project_root: PathBuf,
+}
+
+impl State {
+    fn new(project_root: PathBuf) -> Self {
+        Self { project_root }
+    }
+}
+
+pub async fn run(project_root: PathBuf) {
+    let shared_state = Arc::new(State::new(project_root));
+
+    // build our application with a route
+    let app = Router::new()
+        .route("/", get(index_handler))
+        .route("/api/matches", get(list_matches))
+        .route("/api/matches/:match_id", get(get_match))
+        .fallback(static_handler.into_service())
+        .layer(AddExtensionLayer::new(shared_state));
+
+    // run it
+    let addr = SocketAddr::from(([127, 0, 0, 1], 5000));
+    println!("serving at http://{}", addr);
+    axum::Server::bind(&addr)
+        .serve(app.into_make_service())
+        .await
+        .unwrap();
+}
+
+#[derive(Serialize, Deserialize)]
+struct Match {
+    name: String,
+}
+
+async fn list_matches(Extension(state): Extension<Arc<State>>) -> Json<Vec<Match>> {
+    let matches = state
+        .project_root
+        .join("matches")
+        .read_dir()
+        .unwrap()
+        .filter_map(|entry| {
+            let entry = entry.unwrap();
+            extract_match_name(entry).map(|name| Match { name })
+        })
+        .collect::<Vec<_>>();
+    Json(matches)
+}
+
+// extracts 'filename' if the entry matches'$filename.log'.
+fn extract_match_name(entry: std::fs::DirEntry) -> Option<String> {
+    let file_name = entry.file_name();
+    let path = path::Path::new(&file_name);
+    if path.extension() == Some("log".as_ref()) {
+        path.file_stem()
+            .and_then(|name| name.to_str())
+            .map(|name| name.to_string())
+    } else {
+        None
+    }
+}
+
+async fn get_match(Extension(state): Extension<Arc<State>>, Path(id): Path<String>) -> String {
+    let mut match_path = state.project_root.join("matches").join(id);
+    match_path.set_extension("log");
+    std::fs::read_to_string(match_path).unwrap()
+}
+
+async fn index_handler() -> impl IntoResponse {
+    static_handler("/index.html".parse::<Uri>().unwrap()).await
+}
+
+// static_handler is a handler that serves static files from the
+async fn static_handler(uri: Uri) -> impl IntoResponse {
+    let path = uri.path().trim_start_matches('/').to_string();
+    StaticFile(path)
+}
+
+#[derive(RustEmbed)]
+#[folder = "../web/pw-frontend/dist/"]
+struct Asset;
+pub struct StaticFile<T>(pub T);
+
+impl<T> IntoResponse for StaticFile<T>
+where
+    T: Into<String>,
+{
+    fn into_response(self) -> Response {
+        let path = self.0.into();
+        match Asset::get(path.as_str()) {
+            Some(content) => {
+                let body = boxed(Full::from(content.data));
+                let mime = mime_guess::from_path(path).first_or_octet_stream();
+                Response::builder()
+                    .header(header::CONTENT_TYPE, mime.as_ref())
+                    .body(body)
+                    .unwrap()
+            }
+            None => Response::builder()
+                .status(StatusCode::NOT_FOUND)
+                .body(boxed(Full::from("404")))
+                .unwrap(),
+        }
+    }
+}
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