Refactor; ability to update network config

src/server.rs

@@ -0,0 +1,98 @@
+use std::io::{Read, Write};
+use std::sync::Arc;
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use futures::channel::oneshot;
+use serde::Deserialize;
+use rand::Rng;
+
+use crate::data::UUID;
+use crate::error::Error;
+use crate::membership::System;
+use crate::api_server;
+use crate::rpc_server;
+
+#[derive(Deserialize, Debug)]
+pub struct Config {
+	pub datacenter: String,
+
+	pub metadata_dir: PathBuf,
+	pub data_dir: PathBuf,
+
+	pub api_port: u16,
+	pub rpc_port: u16,
+
+	pub bootstrap_peers: Vec<SocketAddr>,
+}
+
+fn read_config(config_file: PathBuf) -> Result<Config, Error> {
+	let mut file = std::fs::OpenOptions::new()
+		.read(true)
+		.open(config_file.as_path())?;
+	
+	let mut config = String::new();
+	file.read_to_string(&mut config)?;
+
+	Ok(toml::from_str(&config)?)
+}
+
+fn gen_node_id(metadata_dir: &PathBuf) -> Result<UUID, Error> {
+	let mut id_file = metadata_dir.clone();
+	id_file.push("node_id");
+	if id_file.as_path().exists() {
+		let mut f = std::fs::File::open(id_file.as_path())?;
+		let mut d = vec![];
+		f.read_to_end(&mut d)?;
+		if d.len() != 32 {
+			return Err(Error::Message(format!("Corrupt node_id file")))
+		}
+
+		let mut id = [0u8; 32];
+		id.copy_from_slice(&d[..]);
+		Ok(id)
+	} else {
+		let id = rand::thread_rng().gen::<UUID>();
+
+		let mut f = std::fs::File::create(id_file.as_path())?;
+		f.write_all(&id[..])?;
+		Ok(id)
+	}
+}
+
+async fn shutdown_signal(chans: Vec<oneshot::Sender<()>>) {
+    // Wait for the CTRL+C signal
+    tokio::signal::ctrl_c()
+        .await
+        .expect("failed to install CTRL+C signal handler");
+	println!("Received CTRL+C, shutting down.");
+	for ch in chans {
+		ch.send(()).unwrap();
+	}
+}
+
+async fn wait_from(chan: oneshot::Receiver<()>) -> () {
+	chan.await.unwrap()
+}
+
+pub async fn run_server(config_file: PathBuf) -> Result<(), Error> {
+	let config = read_config(config_file)
+		.expect("Unable to read config file");
+
+	let id = gen_node_id(&config.metadata_dir)
+		.expect("Unable to read or generate node ID");
+	println!("Node ID: {}", hex::encode(id));
+
+	let sys = Arc::new(System::new(config, id));
+
+	let (tx1, rx1) = oneshot::channel();
+	let (tx2, rx2) = oneshot::channel();
+
+	let rpc_server = rpc_server::run_rpc_server(sys.clone(), wait_from(rx1));
+	let api_server = api_server::run_api_server(sys.clone(), wait_from(rx2));
+
+	tokio::spawn(shutdown_signal(vec![tx1, tx2]));
+	tokio::spawn(sys.bootstrap());
+
+	futures::try_join!(rpc_server, api_server)?;
+	Ok(())
+}