tokio is hard work

Cargo.toml

@@ -18,8 +18,8 @@ clap = "4.4.18"
 clap-num = "1.0.2"
 clap-verbosity-flag = "2.1.2"
 libpt = { version = "0.3.10", features = ["net"] }
-mio = { version = "0.8.10", features = ["net", "os-poll"] }
 threadpool = { version = "1.8.1", optional = true }
+tokio = { version = "1.35.1", features = ["net", "rt", "macros"] }
 
 [features]
 default = ["server"]

src/common/conf.rs

@@ -1,6 +1,9 @@
 use crate::common::args::Cli;
 use clap::ValueEnum;
-use std::fmt::Display;
+use std::{fmt::Display, time::Duration};
+
+const DEFAULT_TIMEOUT_LEN: u64 = 2000; // ms
+
 #[derive(Debug, Clone, Copy)]
 pub enum Mode {
     Tcp,
@@ -41,6 +44,7 @@ pub struct Config {
     pub addr: std::net::SocketAddr,
     pub mode: Mode,
     pub threads: usize,
+    pub timeout: Duration,
 }
 
 impl Config {
@@ -49,6 +53,7 @@ impl Config {
             addr: cli.addr.clone(),
             mode: cli.mode.clone(),
             threads: cli.threads,
+            timeout: Duration::from_millis(DEFAULT_TIMEOUT_LEN)
         }
     }
 }

src/main.rs

@@ -5,6 +5,7 @@
 
 use anyhow::Result;
 use libpt::log::*;
+use tokio;
 
 mod client;
 mod common;
@@ -14,7 +15,8 @@ use common::{args::Cli, conf::*};
 
 use crate::server::Server;
 
-fn main() -> Result<()> {
+#[tokio::main]
+async fn main() -> Result<()> {
     let cli = Cli::cli_parse();
     debug!("dumping cli args:\n{:#?}", cli);
 
@@ -23,8 +25,7 @@ fn main() -> Result<()> {
     #[cfg(feature = "server")]
     if cli.server {
         info!("starting server");
-        Server::build(cfg)?.run()?;
-        return Ok(());
+        return Server::build(cfg).await?.run().await
     }
     // implicit else, so we can work without the server feature
     info!("starting client");

src/server/mod.rs

@@ -1,69 +1,106 @@
 #![cfg(feature = "server")]
-use anyhow::Result;
-use libpt::log::{error, info};
-use mio::{self, event::Event, net::TcpListener, Events, Interest, Poll, Token};
-use std::time::Duration;
+use std::{net::SocketAddr, time::Duration};
+
+use anyhow::{Result, anyhow};
+use libpt::{
+    bintols::display::humanbytes,
+    log::{error, info, trace, warn, debug},
+};
 use threadpool::ThreadPool;
+use tokio::{
+    io::{AsyncBufRead, AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader, Interest},
+    net::{self, TcpListener, TcpSocket, TcpStream},
+    select,
+    time::timeout,
+};
 
 use crate::common::conf::Config;
 
 pub mod listener;
 
-const EVENT_CAPACITY: usize = 128;
-const SERVER: Token = Token(0);
-
 pub struct Server {
     cfg: Config,
-    work: Poll,
-    events: Events,
     pool: ThreadPool,
     pub timeout: Option<Duration>,
     server: TcpListener,
 }
 
 impl Server {
-    pub fn build(cfg: Config) -> Result<Self> {
-        let mut server = TcpListener::bind(cfg.addr)?;
-        let poll: Poll = Poll::new()?;
-        poll.registry()
-            .register(&mut server, SERVER, Interest::READABLE | Interest::WRITABLE);
-        let events: Events = Events::with_capacity(EVENT_CAPACITY);
+    pub async fn build(cfg: Config) -> Result<Self> {
+        let server = TcpListener::bind(cfg.addr).await?;
         let pool = ThreadPool::new(cfg.threads);
         let timeout = Some(Duration::from_secs(5));
         Ok(Server {
             cfg,
-            work: poll,
-            events,
             pool,
             timeout,
             server,
         })
     }
-    pub fn run(&mut self) -> Result<()> {
+    pub async fn run(self) -> Result<()> {
         loop {
-            self.work.poll(&mut self.events, self.timeout)?;
-            for event in self.events.iter() {
-                let result = self.handle_event(event);
-                if let Err(err) = result {
-                    error!("Error while handling server event {:?}: {:?}", event, err);
-                }
-            }
+            let stream = self.server.accept().await?;
+            self.handle_stream(stream).await?;
         }
     }
 
-    fn handle_event(&self, event: &Event) -> Result<()> {
-        dbg!(event);
-        let connection = match self.server.accept() {
-            Ok(c) => c,
-            Err(err) => {
-                error!("error while handling connection: {:?}", err);
-                return Err(err.into());
+    async fn handle_stream(&self, mut stream: (TcpStream, SocketAddr)) -> Result<()> {
+        info!("start handling stream {:?}", stream.1);
+        let mut buf = Vec::new();
+        let mut reader = BufReader::new(stream.0);
+        let mut len;
+        loop {
+            trace!("reading anew");
+            len = self.read(&mut reader, &mut buf).await?;
+            trace!("did read");
+            if len == 0 {
+                break;
+            } else {
+                info!(
+                    "< {}\t({})\n{}",
+                    stream.1,
+                    humanbytes(len),
+                    self.decode(&buf)?
+                );
+                buf.clear();
             }
-        };
-        self.pool.execute(move|| {
-            dbg!(connection);
-            info!("received a connection!");
-        });
+        }
+        info!("stop handling stream {:?}", stream.1);
         Ok(())
     }
+
+    #[inline]
+    fn decode(&self, buf: &Vec<u8>) -> Result<String> {
+        Ok(String::from_utf8(buf.clone())?)
+    }
+
+    async fn read(&self, reader: &mut BufReader<TcpStream>, buf: &mut Vec<u8>) -> Result<usize> {
+        let mut len: usize;
+        let mut failsafe: u8 = 0;
+        while failsafe < u8::MAX {
+            trace!("loop");
+            len = match timeout(self.cfg.timeout, reader.read(buf)).await {
+                Ok(inner) => {
+                    trace!("Read for len: {inner:?}"); 0
+                },
+                Err(err) => {
+                    error!("timeout while reading: {err}");
+                    return Err(err.into());
+                }
+            };
+            if self.should_end(&buf) {
+                return Ok(len);
+            }
+            else {
+                // ?????????
+                failsafe += 1;
+            }
+        }
+        Err(anyhow!("read too often, so the failsafe activated"))
+    }
+
+    fn should_end(&self, buf: &Vec<u8>) -> bool {
+        debug!("eval should end: {:?}", buf);
+        buf.contains(&0x00)
+    }
 }