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|
use std::io;
use std::path::Path;
use std::process::exit;
use clap::Parser;
use tokio::net::TcpListener;
use tracing::{debug, error, info};
use crate::arguments::Mode;
use crate::server::SharedConfig;
mod arguments;
mod client;
mod config;
mod server;
fn load_config<P: AsRef<Path>>(file_path: P) -> config::Root {
let content = match std::fs::read_to_string(file_path) {
Ok(s) => s,
Err(why) => {
error!("Failed to read config file: {}", why);
exit(1);
}
};
let cfg: config::Root = match toml::from_str(content.as_str()) {
Ok(c) => c,
Err(why) => {
error!("Failed to parse config file: {}", why);
exit(1);
}
};
cfg
}
fn validate_config(cfg: &config::Root) {
for s in &cfg.service {
if s.name.contains("\r\n") {
error!("Service name contains CRLF: `{}`", &s.name);
exit(1);
}
}
}
#[tokio::main]
async fn main() -> io::Result<()> {
tracing_subscriber::fmt::init();
let args = arguments::Args::parse();
info!("args: {:?}", args);
let cfg = load_config(&args.config);
validate_config(&cfg);
match args.mode {
Mode::SERVER => {
if cfg.server == None {
error!("Config `server` is required in current mode");
exit(1);
}
if cfg.service.is_empty() {
error!("No service is defined");
exit(1);
}
server_main(cfg).await
}
Mode::CLIENT => {
if cfg.client == None {
error!("Config `client` is required in current mode");
exit(1);
}
client_main(cfg).await
}
}
}
async fn server_main(cfg: config::Root) -> io::Result<()> {
let listener = TcpListener::bind(cfg.server.unwrap().listen).await?;
info!("Server listening on {:?}", listener);
let max_srv_name_length = cfg
.service
.iter()
.map(|s| s.name.len())
.max()
.expect("No service was defined in config");
debug!("Max service name length: {}", max_srv_name_length);
// this immutable object lives throughout the entire process lifetime,
// so we use 'static here for simplicity
let shared_config: &'static SharedConfig = Box::leak(Box::new(SharedConfig {
max_srv_name_length,
services: cfg.service,
allow_help: cfg.allow_help,
}));
loop {
let (sock, addr) = listener.accept().await?;
tokio::spawn(server::handle_client(shared_config, sock, addr));
}
}
async fn client_server_main(
upstream_addr: &'static String,
listener: TcpListener,
service_name: &'static String,
) -> io::Result<()> {
loop {
let (sock, addr) = listener.accept().await?;
info!("Client connected: {}", addr);
tokio::spawn(client::handle_client(sock, upstream_addr, service_name));
}
}
async fn client_main(cfg: config::Root) -> io::Result<()> {
let mut fut_servers = Vec::new();
let upstream_addr = Box::leak(Box::new(cfg.client.unwrap().addr));
for s in cfg.service {
let listener = TcpListener::bind(&s.addr).await?;
info!("Server listening on {:?} (service {})", listener, &s.name);
let service_name = Box::leak(Box::new(s.name));
fut_servers.push(tokio::spawn(client_server_main(
upstream_addr,
listener,
service_name,
)));
}
for fut in fut_servers {
if let Err(why) = fut.await {
error!("Failed to join server future: {}", why);
}
}
Ok(())
}
|
