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use crate::{config::Config, error::Result, network::Connection};
use feoxdb::FeoxStore;
use std::net::TcpListener;
use std::os::fd::{AsRawFd, RawFd};
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use std::sync::Arc;
use std::thread;
use tracing::{debug, error, info};
/// High-performance Redis-compatible server
pub struct Server {
config: Config,
store: Arc<FeoxStore>,
shutdown: AtomicBool,
active_connections: AtomicUsize,
}
impl Server {
/// Create a new server with the given configuration
pub fn new(config: Config) -> Result<Self> {
config.validate()?;
// Create a single shared FeoxStore instance
let store = if let Some(ref data_path) = config.data_path {
let mut builder = FeoxStore::builder()
.device_path(data_path.clone())
.max_memory(config.max_memory_per_shard.unwrap_or(1024 * 1024 * 1024))
.enable_ttl(config.enable_ttl);
// Set file size if configured
if let Some(file_size) = config.file_size {
builder = builder.file_size(file_size);
}
Arc::new(builder.build()?)
} else {
Arc::new(
FeoxStore::builder()
.max_memory(config.max_memory_per_shard.unwrap_or(1024 * 1024 * 1024))
.enable_ttl(config.enable_ttl)
.build()?,
)
};
Ok(Self {
config,
store,
shutdown: AtomicBool::new(false),
active_connections: AtomicUsize::new(0),
})
}
/// Run the server, spawning worker threads
///
/// This method blocks until the server is shut down.
pub fn run(self: Arc<Self>) -> Result<()> {
// Create TCP listener
let listener =
TcpListener::bind(format!("{}:{}", self.config.bind_addr, self.config.port))?;
listener.set_nonblocking(true)?;
let listener_fd = listener.as_raw_fd();
info!(
"Server listening on {}:{}",
self.config.bind_addr, self.config.port
);
// Spawn worker threads
let mut handles = Vec::new();
for thread_id in 0..self.config.threads {
let server = Arc::clone(&self);
let store = Arc::clone(&self.store);
let handle = thread::spawn(move || {
if let Err(e) = server.run_worker(thread_id, listener_fd, store) {
error!("Worker {} failed: {}", thread_id, e);
}
});
handles.push(handle);
}
// Wait for all workers to finish
for handle in handles {
let _ = handle.join();
}
Ok(())
}
/// Signal the server to shut down gracefully
pub fn shutdown(&self) {
info!("Initiating server shutdown");
self.shutdown.store(true, Ordering::Release);
}
/// Get the number of active client connections
pub fn active_connections(&self) -> usize {
self.active_connections.load(Ordering::Acquire)
}
fn run_worker(
self: &Arc<Self>,
thread_id: usize,
listener_fd: RawFd,
store: Arc<FeoxStore>,
) -> Result<()> {
use mio::net::{TcpListener as MioTcpListener, TcpStream as MioTcpStream};
use mio::{Events, Interest, Poll, Token};
use std::collections::HashMap;
use std::io::{ErrorKind, Read, Write};
use std::os::fd::FromRawFd;
// Create mio Poll instance
let mut poll = Poll::new()?;
let mut events = Events::with_capacity(1024);
// Convert raw fd to mio listener
let std_listener = unsafe { TcpListener::from_raw_fd(listener_fd) };
std_listener.set_nonblocking(true)?;
let mut listener = MioTcpListener::from_std(std_listener);
// Register listener
const SERVER: Token = Token(0);
poll.registry()
.register(&mut listener, SERVER, Interest::READABLE)?;
// Connection tracking
let mut connections: HashMap<Token, (MioTcpStream, Connection)> = HashMap::new();
let mut next_token = 1usize;
info!("Worker {} started", thread_id);
// Event loop
while !self.shutdown.load(Ordering::Acquire) {
// Poll for events with 100ms timeout
poll.poll(&mut events, Some(std::time::Duration::from_millis(100)))?;
for event in events.iter() {
match event.token() {
SERVER => {
// Accept new connections
loop {
match listener.accept() {
Ok((mut stream, addr)) => {
debug!("New connection from {:?}", addr);
// Configure socket
stream.set_nodelay(self.config.tcp_nodelay)?;
let token = Token(next_token);
next_token += 1;
// Register for read events
poll.registry().register(
&mut stream,
token,
Interest::READABLE,
)?;
let connection = Connection::new(
0, // fd not used in this path
self.config.connection_buffer_size,
Arc::clone(&store),
);
connections.insert(token, (stream, connection));
self.active_connections.fetch_add(1, Ordering::Relaxed);
}
Err(e) if e.kind() == ErrorKind::WouldBlock => break,
Err(e) => {
error!("Error accepting connection: {}", e);
break;
}
}
}
}
token => {
// Handle client connection
let should_close = if let Some((stream, connection)) =
connections.get_mut(&token)
{
let mut should_close = false;
if event.is_readable() {
// Use a simple buffer (optimize with pool later if needed)
let mut buffer = vec![0u8; 8192];
match stream.read(&mut buffer) {
Ok(0) => {
// Connection closed
should_close = true;
}
Ok(n) => {
// Process commands inline
if let Err(e) = connection.process_read(&buffer[..n]) {
error!("Error processing read: {}", e);
should_close = true;
} else {
// Write response immediately
while let Some(response_data) =
connection.pending_writes()
{
let response_len = response_data.len();
match stream.write(response_data) {
Ok(n) => {
connection.consume_writes(n);
if n < response_len {
// Partial write, would block
break;
}
}
Err(e) if e.kind() == ErrorKind::WouldBlock => {
break;
}
Err(e) => {
error!("Error writing: {}", e);
should_close = true;
break;
}
}
}
}
if connection.is_closed() {
should_close = true;
}
}
Err(e) if e.kind() != ErrorKind::WouldBlock => {
if e.kind() != ErrorKind::ConnectionReset {
error!("Error reading: {}", e);
}
should_close = true;
}
Err(_) => {} // WouldBlock - ignore
}
}
should_close
} else {
false
};
if should_close {
if let Some((mut stream, mut connection)) = connections.remove(&token) {
let _ = poll.registry().deregister(&mut stream);
connection.close();
self.active_connections.fetch_sub(1, Ordering::Relaxed);
}
}
}
}
}
}
// Cleanup
for (_, (mut stream, mut connection)) in connections {
let _ = poll.registry().deregister(&mut stream);
connection.close();
}
info!("Worker {} shutting down", thread_id);
Ok(())
}
}