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pub fn server(cache_path: PathBuf, socket_path: &PathBuf, data_dir: PathBuf) -> Result<(), Error> {let server = server::new(cache_path, data_dir)?;server.start(socket_path)?;
pub fn server(cache_dir: PathBuf, socket: PathBuf, data_dir: PathBuf) -> Result<(), Error> {let server = server::builder(cache_dir, data_dir, socket).build()?.run()?;
use super::Server;use crate::store;use crossbeam_utils::sync::WaitGroup;use std::{os::unix::net::UnixDatagram,path::PathBuf,sync::{atomic::AtomicBool,Arc,},};use thiserror::Error;#[derive(Error, Debug)]pub enum Error {#[error("can not open entries database: {0}")]OpenEntriesDb(sled::Error),#[error("no parent directory for socket path")]NoSocketPathParent,#[error("can not create socket parent directory: {0}")]CreateSocketPathParent(std::io::Error),#[error("can not bind to socket: {0}")]BindSocket(std::io::Error),}pub struct Builder {pub(super) cache_dir: PathBuf,pub(super) data_dir: PathBuf,pub(super) socket: PathBuf,}impl Builder {pub fn build(self) -> Result<Server, Error> {let entries = sled::open(self.cache_dir.join("entries")).map_err(Error::OpenEntriesDb)?;let socket_path_parent = self.socket.parent().ok_or(Error::NoSocketPathParent)?;std::fs::create_dir_all(socket_path_parent).map_err(Error::CreateSocketPathParent)?;let socket = UnixDatagram::bind(&self.socket).map_err(Error::BindSocket)?;let store = store::new(self.data_dir);let stopping = Arc::new(AtomicBool::new(false));let wait_group = WaitGroup::new();Ok(Server {entries,socket,socket_path: self.socket,store,stopping,wait_group,})}}
pub mod builder;pub mod server;pub use builder::{Builder,Error as BuilderError,};pub use server::{builder,Error as ServerError,Server,};
use super::Builder;use crate::{client,message::Message,store::Store,};use crossbeam_utils::sync::WaitGroup;use flume::{Receiver,Sender,};use log::warn;use std::{os::unix::net::UnixDatagram,path::PathBuf,sync::{atomic::{AtomicBool,Ordering,},Arc,},thread,};use thiserror::Error;const BUFFER_SIZE: usize = 65_527;#[derive(Error, Debug)]pub enum Error {#[error("can not receive message from socket: {0}")]ReceiveFromSocket(std::io::Error),#[error("can not send received data to processing: {0}")]SendBuffer(flume::SendError<Vec<u8>>),#[error("can not deserialize message: {0}")]DeserializeMessage(bincode::Error),#[error("can not receive data from channel: {0}")]ReceiveData(flume::RecvError),#[error("can not remove socket: {0}")]RemoveSocket(std::io::Error),#[error("can not setup ctrlc handler: {0}")]SetupCtrlHandler(ctrlc::Error),}pub struct Server {pub(super) entries: sled::Db,pub(super) socket: UnixDatagram,pub(super) socket_path: PathBuf,pub(super) store: Store,pub(super) stopping: Arc<AtomicBool>,pub(super) wait_group: WaitGroup,}pub fn builder(cache_dir: PathBuf, data_dir: PathBuf, socket: PathBuf) -> Builder {Builder {cache_dir,data_dir,socket,}}impl Server {pub fn run(self) -> Result<(), Error> {let data_sender =Self::start_processor(Arc::clone(&self.stopping), self.wait_group.clone())?;Self::start_receiver(Arc::clone(&self.stopping),self.wait_group.clone(),self.socket,data_sender,)?;Self::ctrl_c_watcher(self.stopping, self.socket_path.clone())?;self.wait_group.wait();std::fs::remove_file(&self.socket_path).map_err(Error::RemoveSocket)?;Ok(())}fn ctrl_c_watcher(stopping: Arc<AtomicBool>, socket_path: PathBuf) -> Result<(), Error> {ctrlc::set_handler(move || {stopping.store(true, Ordering::SeqCst);let client = client::new(socket_path.clone());if let Err(err) = client.send(&Message::Stop) {warn!("{}", err);}}).map_err(Error::SetupCtrlHandler)?;Ok(())}fn start_receiver(stopping: Arc<AtomicBool>,wait_group: WaitGroup,socket: UnixDatagram,data_sender: Sender<Vec<u8>>,) -> Result<(), Error> {thread::spawn(move || {loop {if dbg!(stopping.load(Ordering::SeqCst)) {dbg!("break loop");break;}if let Err(err) = Self::receive(&socket, &data_sender) {warn!("{}", err)}}drop(wait_group)});Ok(())}fn receive(socket: &UnixDatagram, data_sender: &Sender<Vec<u8>>) -> Result<(), Error> {dbg!("receive");let mut buffer = [0_u8; BUFFER_SIZE];let (written, _) = socket.recv_from(&mut buffer).map_err(Error::ReceiveFromSocket)?;data_sender.send(buffer[0..written].to_vec()).map_err(Error::SendBuffer)?;Ok(())}fn start_processor(stopping: Arc<AtomicBool>,wait_group: WaitGroup,) -> Result<Sender<Vec<u8>>, Error> {let (data_sender, data_receiver) = flume::unbounded();thread::spawn(move || {loop {if dbg!(stopping.load(Ordering::SeqCst)) {break;}if let Err(err) = Self::process(&stopping, &data_receiver) {warn!("{}", err)}}drop(wait_group)});Ok(data_sender)}fn process(stopping: &Arc<AtomicBool>, data_receiver: &Receiver<Vec<u8>>) -> Result<(), Error> {let data = data_receiver.recv().map_err(Error::ReceiveData)?;let message = bincode::deserialize(&data).map_err(Error::DeserializeMessage)?;dbg!(&message);match message {Message::Stop => stopping.store(true, Ordering::SeqCst),_ => todo!(),}Ok(())}}
let (data_sender, data_receiver) = flume::unbounded();let (signal_sender, signal_receiver) = flume::unbounded();let stopping = Arc::new(AtomicBool::new(false));Self::ctrl_c_watcher(signal_sender)?;Self::signal_watcher(signal_receiver, Arc::clone(&stopping));Self::start_processor(data_receiver);
match Self::receive(&socket) {Err(err) => warn!("{}", err),Ok(message) => match self.process(message) {Ok(state) => {if state.is_stop() {break;}}
if stopping.load(Ordering::SeqCst) {break;}
}fn signal_watcher(signal_receiver: Receiver<RunState>, stopping: Arc<AtomicBool>) {thread::spawn(move || loop {match signal_receiver.recv() {Ok(signal) => match signal {RunState::Stop => stopping.store(true, Ordering::SeqCst),RunState::Continue => continue,},Err(err) => warn!("{}", err),}});
Ok(message)
fn start_processor(data_receiver: Receiver<Vec<u8>>) -> Result<(), Error> {loop {let buffer = match data_receiver.recv() {Ok(b) => b,Err(err) => {warn!("{}", err);continue;}};let message = bincode::deserialize(&buffer).map_err(Error::DeserializeMessage)?;}