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|
#![allow(dead_code)]
use std::{
ffi::OsString,
os::unix::ffi::OsStringExt,
path::{Component, Path, PathBuf},
process::ExitCode,
};
use mlua::{Function, Lua, Table};
use tokio::{
io::{self, BufReader, BufWriter},
net::{TcpListener, TcpStream},
};
use crate::{
client::Client,
handler::{Handle, Handler},
request::Request,
response::{Response, Status},
};
mod client;
mod handler;
mod request;
mod response;
macro_rules! exit {
($fmt:literal, $($s:expr),*) => {
{
eprintln!($fmt, $($s),*);
return ::std::process::ExitCode::FAILURE
}
}
}
#[derive(Debug, thiserror::Error)]
enum HandleError {
#[error("error reading handler function: {0}")]
Function(mlua::Error),
#[error("error calling handler: {0}")]
InvokeHandler(mlua::Error),
#[error("handler error: {0}")]
Handler(#[from] handler::Error),
}
#[derive(Debug, thiserror::Error)]
enum ResponseError {
#[error("error reading request: {0}")]
Request(request::Error),
#[error("error sending response: {0}")]
Response(io::Error),
}
#[derive(Debug, thiserror::Error)]
enum InitLuaError {
#[error("failed to create variable: {0}")]
CreateTable(mlua::Error),
#[error("failed to create helper function: {0}")]
Function(mlua::Error),
#[error("failed to set variable {1}: {0}")]
SetVar(mlua::Error, String),
#[error("failed to load variable {1}: {0}")]
LoadVar(mlua::Error, String),
#[error("failed to load config: {0}")]
LoadConfig(std::io::Error),
#[error("failed to eval config: {0}")]
EvalConfig(mlua::Error),
}
async fn handle(handlers: Table, request: Request) -> Result<Response, HandleError> {
let method = request.method().to_string();
let function = handlers
.get::<Function>(method.as_str())
.map_err(HandleError::Function)?;
let handler = function
.call::<Handler>(request.clone())
.map_err(HandleError::InvokeHandler)?;
match handler {
Handler::StaticFile(staticfile) => Ok(staticfile.handle(request).await?),
Handler::Lua(lua_response) => Ok(lua_response.handle(request).await?),
}
}
async fn response(handlers: Table, stream: TcpStream) -> Result<(), ResponseError> {
let mut client = {
let (r, w) = stream.into_split();
Client::new(BufReader::new(r), BufWriter::new(w))
};
while let Some(request) = client
.read_request()
.await
.map_err(ResponseError::Request)?
{
let response = match handle(handlers.clone(), request).await {
Ok(response) => response,
Err(e) => {
eprintln!("failed to handle request: {e:?}");
Response::builder()
.status(Status::InternalServerError)
.body(response::Body::Empty)
}
};
client
.send_response(response)
.await
.map_err(ResponseError::Response)?;
}
Ok(())
}
fn join_path(root: &Path, rest: &Path) -> Result<PathBuf, std::io::Error> {
root.components()
.chain(
rest.components()
.filter(|p| !matches!(p, Component::RootDir)),
)
.filter(|p| !matches!(p, Component::CurDir | Component::ParentDir))
.collect::<PathBuf>()
.canonicalize()
}
fn init_lua(lua: Lua) -> Result<(), InitLuaError> {
let http = lua.create_table().map_err(InitLuaError::CreateTable)?;
lua.globals()
.set("http", http.clone())
.map_err(|e| InitLuaError::SetVar(e, "http".to_string()))?;
http.set(
"join_paths",
lua.create_function(|_, (root, rest): (mlua::String, mlua::String)| {
let a = PathBuf::from(OsString::from_vec(root.as_bytes().to_vec()));
let b = PathBuf::from(OsString::from_vec(rest.as_bytes().to_vec()));
join_path(&a, &b).map_err(|e| mlua::Error::runtime(format!("failed to join path: {e}")))
})
.map_err(InitLuaError::Function)?,
)
.map_err(|e| InitLuaError::SetVar(e, "http.join_paths".to_string()))?;
let chunk = lua.load(std::fs::read_to_string("config.lua").map_err(InitLuaError::LoadConfig)?);
chunk.eval::<()>().map_err(InitLuaError::EvalConfig)?;
Ok(())
}
#[allow(unexpected_cfgs)]
#[tokio::main(flavor = "local")]
async fn main() -> ExitCode {
let lua = Lua::new();
if let Err(e) = init_lua(lua.clone()) {
exit!("failed to init lua: {}", e);
}
let http = match lua.globals().get::<Table>("http") {
Ok(http) => http,
Err(e) => exit!("failed to load table 'http': {}", e),
};
let bind = match http.get::<String>("bind") {
Ok(bind) => bind,
Err(e) => exit!("failed to load string 'http.bind': {}", e),
};
let handlers = match http.get::<Table>("handlers") {
Ok(handlers) => handlers,
Err(e) => exit!("failed to load 'http.handlers': {}", e),
};
let listener = match TcpListener::bind(&bind).await {
Ok(listener) => listener,
Err(e) => exit!("failed to bind to {}: {}", bind, e),
};
loop {
let (stream, addr) = match listener.accept().await {
Ok((stream, addr)) => (stream, addr),
Err(e) => {
eprintln!("failed to accept connection: {e}");
continue;
}
};
eprintln!("accepted connection from {addr}");
let future = response(handlers.clone(), stream);
tokio::task::spawn_local(async {
if let Err(e) = future.await {
eprintln!("response failure: {e:?}");
}
});
}
}
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