rust is a myth. it doesn't existconfig-toml

author: Melody Horn <melody@boringcactus.com> 2021-12-24 16:25:51 -0700
committer: Melody Horn <melody@boringcactus.com> 2021-12-24 16:25:51 -0700
commit: 3817ec811d76b91d3d4924003a4d48d0cd43a576 (patch)
tree: 93cd9ac73e08c9d4414bb312f7a01f104581a160 /src
parent: c6d12d80babd9f4bd5692cf74ab9d6e9278859d1 (diff)
download: narchttpd-3817ec811d76b91d3d4924003a4d48d0cd43a576.tar.gz
narchttpd-3817ec811d76b91d3d4924003a4d48d0cd43a576.zip
4 files changed, 137 insertions, 163 deletions
diff --git a/src/main.rs b/src/main.rs
index 0951518..f284b75 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,86 +1,87 @@
+use std::collections::HashMap;
 use std::convert::Infallible;
+use std::fs::read_to_string;
 use std::net::SocketAddr;
 use std::path::PathBuf;
-use std::rc::Rc;
 use std::sync::Arc;
 
 use hyper::service::{make_service_fn, service_fn};
 use hyper::{header, Body, Request, Response, Server, StatusCode};
-use rhai::{Dynamic, Engine, FnPtr, Map, NativeCallContext, Scope};
+use serde::Deserialize;
 use structopt::StructOpt;
 
 mod utils;
+use utils::HttpHandler;
 
 #[derive(Debug, StructOpt)]
 struct Opt {
-    #[structopt(long, parse(from_os_str), default_value = "narchttpd.rhai")]
-    config_script: PathBuf,
+    #[structopt(long, parse(from_os_str), default_value = "narchttpd.toml")]
+    config_file: PathBuf,
 }
 
-fn make_engine() -> Engine {
-    let mut engine = Engine::new();
-    engine.register_type_with_name::<Rc<Request<Body>>>("Request");
-    engine.register_type::<utils::serve_static::Params>();
-    engine.register_fn(
-        "handle_request_serve_static",
-        utils::serve_static::handle_request,
-    );
-    engine.register_fn("serve_static", utils::serve_static::serve_static);
-    engine.register_fn(
-        "handle_request_proxy_child",
-        utils::proxy_child::handle_request,
-    );
-    engine.register_fn("proxy_child", utils::proxy_child::proxy_child);
-    engine
+#[derive(Deserialize)]
+#[serde(tag = "mode", rename_all = "kebab-case")]
+enum DomainConfig {
+    Static {
+        root: PathBuf,
+    },
+
+    ProxyChild {
+        command: String,
+        in_dir: Option<PathBuf>,
+        port: u16,
+    },
+}
+
+impl DomainConfig {
+    fn handler(self) -> Box<dyn HttpHandler> {
+        match self {
+            Self::Static { root } => Box::new(utils::serve_static::Params::new(root)),
+            Self::ProxyChild {
+                command,
+                in_dir,
+                port,
+            } => Box::new(utils::proxy_child::ProxyChild::new(command, in_dir, port)),
+        }
+    }
 }
 
-fn get_config_scope(engine: &Engine, opt: &Opt) -> Scope<'static> {
-    let mut ast = engine.compile_file(opt.config_script.clone()).unwrap();
-
-    let mut scope = Scope::new();
-    scope.push("http_ports", [80]);
-    scope.push("https_ports", [443]);
-    scope.push("domains", Map::new());
-    let export_ast = engine
-        .compile("export http_ports, https_ports, domains;")
-        .unwrap();
-    ast.combine(export_ast);
-    let _: () = engine.eval_ast_with_scope(&mut scope, &ast).unwrap();
-    scope
+#[derive(Deserialize)]
+struct Config {
+    http_ports: Vec<u16>,
+    https_ports: Vec<u16>,
+    #[serde(flatten)]
+    domains: HashMap<String, DomainConfig>,
 }
 
 #[tokio::main]
 async fn main() {
-    let opt = Arc::new(Opt::from_args());
+    let opt = Opt::from_args();
 
-    let engine = make_engine();
-    let scope = get_config_scope(&engine, &opt);
+    let config_data = read_to_string(&opt.config_file).expect("Config file not found");
 
-    let http_ports: rhai::Array = scope.get_value("http_ports").unwrap();
-    let http_ports: Vec<u16> = http_ports
-        .into_iter()
-        .map(|x| x.as_int().unwrap() as u16)
-        .collect();
-    let https_ports: rhai::Array = scope.get_value("https_ports").unwrap();
-    let https_ports: Vec<u16> = https_ports
-        .into_iter()
-        .map(|x| x.as_int().unwrap() as u16)
-        .collect();
+    let Config {
+        http_ports,
+        https_ports,
+        domains,
+    } = toml::from_str(&config_data).expect("Config file not valid");
 
     assert!(https_ports.is_empty(), "HTTPS is complicated oops");
 
+    let domains: HashMap<_, _> = domains
+        .into_iter()
+        .map(|(domain, config)| (domain, Arc::new(config.handler())))
+        .collect();
+    let do_response_domains = domains.clone();
+
     // TODO learn hyper
-    let do_response = move |ctx: &NativeCallContext, domains: Map, req: Request<Body>| {
-        for (domain, handler) in &domains {
+    let do_response = move |req: Request<Body>| async move {
+        for (domain, handler) in do_response_domains.clone() {
             let req_domain = req.headers().get(header::HOST).unwrap();
-            if domain.as_str() == req_domain {
+            if &domain == req_domain {
                 eprintln!("request {:?} matched domain {}", req, domain);
                 // matched!
-                let handler: FnPtr = handler.clone_cast();
-                let args = [Dynamic::from(Rc::new(req))];
-                let result = handler.call_dynamic(ctx, None, args).unwrap();
-                let result: Rc<Response<Body>> = result.cast();
-                return Rc::try_unwrap(result).unwrap();
+                return handler.handle(req).await;
             }
         }
         Response::builder()
@@ -96,19 +97,7 @@ async fn main() {
 
     let make_svc = make_service_fn(move |_conn| async move {
         Ok::<_, Infallible>(service_fn(move |req| async move {
-            let handle = tokio::runtime::Handle::current();
-            let response = handle
-                .spawn_blocking(move || {
-                    let opt = Opt::from_args();
-                    let engine = make_engine();
-                    let scope = get_config_scope(&engine, &opt);
-                    let request_handler_context =
-                        NativeCallContext::new(&engine, "handle_request", &[]);
-                    let domains: Map = scope.get_value("domains").unwrap();
-                    do_response(&request_handler_context, domains, req)
-                })
-                .await
-                .unwrap();
+            let response = do_response(req).await;
             Ok::<_, Infallible>(response)
         }))
     });
diff --git a/src/utils.rs b/src/utils.rs
index 0bd5c2e..ebc21f2 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,2 +1,10 @@
+use async_trait::async_trait;
+use hyper::{Body, Request, Response};
+
 pub mod proxy_child;
 pub mod serve_static;
+
+#[async_trait]
+pub trait HttpHandler: Send + Sync {
+    async fn handle(&self, request: Request<Body>) -> Response<Body>;
+}
diff --git a/src/utils/proxy_child.rs b/src/utils/proxy_child.rs
index d7a021d..cc35298 100644
--- a/src/utils/proxy_child.rs
+++ b/src/utils/proxy_child.rs
@@ -1,9 +1,12 @@
+use std::path::PathBuf;
 use std::process::{Child as ChildProcess, Command};
 use std::rc::Rc;
+use std::sync::Arc;
 
 use hyper::http::uri::Scheme;
 use hyper::{header, Body, Client, Request, Response};
-use rhai::{Dynamic, FnPtr, Map};
+
+use super::{async_trait, HttpHandler};
 
 pub struct KillOnDrop(ChildProcess);
 
@@ -15,60 +18,48 @@ impl Drop for KillOnDrop {
 
 #[derive(Clone)]
 pub struct ProxyChild {
-    process: Rc<KillOnDrop>,
+    process: Arc<KillOnDrop>,
     port: u16,
 }
 
 impl ProxyChild {
-    fn new(params: Map) -> Self {
-        let command_line = params["command"].clone().into_immutable_string().unwrap();
-        let port = params["port"].as_int().unwrap();
+    pub fn new(command_line: String, in_dir: Option<PathBuf>, port: u16) -> Self {
         let mut command_line = command_line.split(" ");
         let command = command_line.next().unwrap();
         let mut child = Command::new(command);
         child.args(command_line);
-        if let Some(cwd) = params.get("in_dir") {
-            let cwd = cwd.clone().into_immutable_string().unwrap();
-            let cwd: &str = cwd.as_ref();
+        if let Some(cwd) = in_dir {
             child.current_dir(cwd);
         }
         let child = child.spawn().unwrap();
         Self {
-            process: Rc::new(KillOnDrop(child)),
+            process: Arc::new(KillOnDrop(child)),
             port: port as u16,
         }
     }
 }
 
-pub fn handle_request(child: &mut ProxyChild, request: Rc<Request<Body>>) -> Rc<Response<Body>> {
-    let ProxyChild { port, .. } = child;
-    let mut request_uri = request.uri().clone().into_parts();
-    // TODO ipv6 loopback?
-    request_uri.authority = Some(format!("127.0.0.1:{}", port).parse().unwrap());
-    request_uri.scheme = Some(Scheme::HTTP);
-    let mut proxy_request = Request::builder()
-        .method(request.method())
-        .uri(request_uri)
-        .header(header::HOST, request.headers()[header::HOST].clone());
-    proxy_request.headers_mut().unwrap().extend(
-        request
-            .headers()
-            .iter()
-            .map(|(x, y)| (x.clone(), y.clone())),
-    );
-    // TODO handle nonempty body
-    let proxy_request = proxy_request.body(Body::empty()).unwrap();
-    let response = async {
+#[async_trait]
+impl HttpHandler for ProxyChild {
+    async fn handle(&self, request: Request<Body>) -> Response<Body> {
+        let ProxyChild { port, .. } = self;
+        let mut request_uri = request.uri().clone().into_parts();
+        // TODO ipv6 loopback?
+        request_uri.authority = Some(format!("127.0.0.1:{}", port).parse().unwrap());
+        request_uri.scheme = Some(Scheme::HTTP);
+        let mut proxy_request = Request::builder()
+            .method(request.method())
+            .uri(request_uri)
+            .header(header::HOST, request.headers()[header::HOST].clone());
+        proxy_request.headers_mut().unwrap().extend(
+            request
+                .headers()
+                .iter()
+                .map(|(x, y)| (x.clone(), y.clone())),
+        );
+        // TODO handle nonempty body
+        let proxy_request = proxy_request.body(Body::empty()).unwrap();
         let client = Client::new();
-        Rc::new(client.request(proxy_request).await.unwrap())
-    };
-    let runtime = tokio::runtime::Handle::current();
-    runtime.block_on(response)
-}
-
-pub fn proxy_child(params: Map) -> FnPtr {
-    let child = ProxyChild::new(params);
-    let mut result = FnPtr::new("handle_request_proxy_child").unwrap();
-    result.add_curry(Dynamic::from(child));
-    result
+        client.request(proxy_request).await.unwrap()
+    }
 }
diff --git a/src/utils/serve_static.rs b/src/utils/serve_static.rs
index 2ec0a90..c087c21 100644
--- a/src/utils/serve_static.rs
+++ b/src/utils/serve_static.rs
@@ -1,75 +1,61 @@
 use std::fs::File;
 use std::io::{ErrorKind, Read};
 use std::path::PathBuf;
-use std::rc::Rc;
 
 use hyper::{Body, Request, Response, StatusCode};
-use rhai::{Dynamic, FnPtr, Map};
+
+use super::{async_trait, HttpHandler};
 
 #[derive(Clone, Debug)]
 pub struct Params {
     root: PathBuf,
 }
 
-#[derive(Debug)]
-pub struct KeyError(&'static str);
-
-impl TryFrom<Map> for Params {
-    type Error = KeyError;
-
-    fn try_from(mut value: Map) -> Result<Self, Self::Error> {
-        let root = value
-            .remove("root")
-            .and_then(|value| value.into_immutable_string().ok())
-            .ok_or(KeyError("root"))?;
-        let root: PathBuf = root.parse().unwrap();
+impl Params {
+    pub fn new(root: PathBuf) -> Self {
         let root = root.canonicalize().unwrap();
-        Ok(Self { root })
+        Self { root }
     }
 }
 
-pub fn handle_request(params: &mut Params, request: Rc<Request<Body>>) -> Rc<Response<Body>> {
-    let Params { root } = params;
-    eprintln!("handling request {:?}", request);
-    let request_path = request.uri().path();
-    let request_path = request_path.trim_start_matches("/");
-    let target = root.join(request_path);
-    let target = if target.is_dir() {
-        target.join("index.html")
-    } else {
-        target
-    };
-    eprintln!("target is {}", target.display());
-    let response = if target.ancestors().all(|ancestor| ancestor != root) {
-        // oops! all directory traversal
-        Response::builder()
-            .status(StatusCode::BAD_REQUEST)
-            .body(Body::empty())
-    } else {
-        let file = File::open(target);
-        match file {
-            Ok(mut file) => {
-                let mut result = Vec::new();
-                file.read_to_end(&mut result).unwrap();
-                Response::builder().body(Body::from(result))
-            }
-            Err(err) => {
-                let status_code = match err.kind() {
-                    ErrorKind::NotFound => StatusCode::NOT_FOUND,
-                    _ => StatusCode::BAD_REQUEST,
-                };
-                Response::builder()
-                    .status(status_code)
-                    .body(Body::from(status_code.canonical_reason().unwrap_or("")))
+#[async_trait]
+impl HttpHandler for Params {
+    async fn handle(&self, request: Request<Body>) -> Response<Body> {
+        let Params { root } = self;
+        eprintln!("handling request {:?}", request);
+        let request_path = request.uri().path();
+        let request_path = request_path.trim_start_matches("/");
+        let target = root.join(request_path);
+        let target = if target.is_dir() {
+            target.join("index.html")
+        } else {
+            target
+        };
+        eprintln!("target is {}", target.display());
+        let response = if target.ancestors().all(|ancestor| ancestor != root) {
+            // oops! all directory traversal
+            Response::builder()
+                .status(StatusCode::BAD_REQUEST)
+                .body(Body::empty())
+        } else {
+            let file = File::open(target);
+            match file {
+                Ok(mut file) => {
+                    let mut result = Vec::new();
+                    file.read_to_end(&mut result).unwrap();
+                    Response::builder().body(Body::from(result))
+                }
+                Err(err) => {
+                    let status_code = match err.kind() {
+                        ErrorKind::NotFound => StatusCode::NOT_FOUND,
+                        _ => StatusCode::BAD_REQUEST,
+                    };
+                    Response::builder()
+                        .status(status_code)
+                        .body(Body::from(status_code.canonical_reason().unwrap_or("")))
+                }
             }
-        }
-    };
-    Rc::new(response.unwrap())
-}
-
-pub fn serve_static(params: Map) -> FnPtr {
-    let params: Params = params.try_into().unwrap();
-    let mut result = FnPtr::new("handle_request_serve_static").unwrap();
-    result.add_curry(Dynamic::from(params));
-    result
+        };
+        response.unwrap()
+    }
 }
author	Melody Horn <melody@boringcactus.com>	2021-12-24 16:25:51 -0700
committer	Melody Horn <melody@boringcactus.com>	2021-12-24 16:25:51 -0700
commit	3817ec811d76b91d3d4924003a4d48d0cd43a576 (patch)
tree	93cd9ac73e08c9d4414bb312f7a01f104581a160 /src
parent	c6d12d80babd9f4bd5692cf74ab9d6e9278859d1 (diff)
download	narchttpd-3817ec811d76b91d3d4924003a4d48d0cd43a576.tar.gz narchttpd-3817ec811d76b91d3d4924003a4d48d0cd43a576.zip