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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 crate::data::*;
use crate::error::Error;
use crate::membership::System;
use crate::api_server;
use crate::rpc_server;
fn default_block_size() -> usize {
1048576
}
fn default_meta_replication_factor() -> usize {
3
}
#[derive(Deserialize, Debug)]
pub struct Config {
pub metadata_dir: PathBuf,
pub data_dir: PathBuf,
pub api_port: u16,
pub rpc_port: u16,
pub bootstrap_peers: Vec<SocketAddr>,
#[serde(default = "default_block_size")]
pub block_size: usize,
#[serde(default = "default_meta_replication_factor")]
pub meta_replication_factor: usize,
}
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.into())
} else {
let id = gen_uuid();
let mut f = std::fs::File::create(id_file.as_path())?;
f.write_all(id.as_slice())?;
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(())
}
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