open-coroutine-core 0.7.0

The open-coroutine is a simple, efficient and generic coroutine library.
Documentation
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use crate::net::operator::Operator;
use io_uring::{opcode, squeue, types, IoUring, SubmissionQueue};
use slab::Slab;
use std::collections::VecDeque;
use std::io::{BufRead, BufReader, Write};
use std::net::{IpAddr, Ipv4Addr, SocketAddr, TcpListener, TcpStream};
use std::os::unix::io::{AsRawFd, RawFd};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::time::Duration;
use std::{io, ptr};

#[derive(Clone, Debug)]
enum Token {
    Accept,
    Read {
        fd: RawFd,
        buf_index: usize,
    },
    Write {
        fd: RawFd,
        buf_index: usize,
        offset: usize,
        len: usize,
    },
}

struct AcceptCount {
    entry: squeue::Entry,
    count: usize,
}

impl AcceptCount {
    fn new(fd: RawFd, token: usize, count: usize) -> AcceptCount {
        AcceptCount {
            entry: opcode::Accept::new(types::Fd(fd), ptr::null_mut(), ptr::null_mut())
                .flags(libc::SOCK_CLOEXEC)
                .build()
                .user_data(token as _),
            count,
        }
    }

    fn push_to(&mut self, sq: &mut SubmissionQueue<'_>) {
        while self.count > 0 {
            unsafe {
                match sq.push(&self.entry) {
                    Ok(_) => self.count -= 1,
                    Err(_) => break,
                }
            }
        }

        sq.sync();
    }
}

fn crate_server(port: u16, server_started: Arc<AtomicBool>) -> anyhow::Result<()> {
    let mut ring: IoUring = IoUring::builder()
        .setup_sqpoll(1000)
        .setup_sqpoll_cpu(0)
        .build(1024)?;
    let listener = TcpListener::bind(("127.0.0.1", port))?;

    let mut backlog = VecDeque::new();
    let mut bufpool = Vec::with_capacity(64);
    let mut buf_alloc = Slab::with_capacity(64);
    let mut token_alloc = Slab::with_capacity(64);

    println!("listen {}", listener.local_addr()?);
    server_started.store(true, Ordering::Release);

    let (submitter, mut sq, mut cq) = ring.split();

    let mut accept = AcceptCount::new(listener.as_raw_fd(), token_alloc.insert(Token::Accept), 1);

    accept.push_to(&mut sq);

    loop {
        match submitter.submit_and_wait(1) {
            Ok(_) => (),
            Err(ref err) if err.raw_os_error() == Some(libc::EBUSY) => (),
            Err(err) => return Err(err.into()),
        }
        cq.sync();

        // clean backlog
        loop {
            if sq.is_full() {
                match submitter.submit() {
                    Ok(_) => (),
                    Err(ref err) if err.raw_os_error() == Some(libc::EBUSY) => break,
                    Err(err) => return Err(err.into()),
                }
            }
            sq.sync();

            match backlog.pop_front() {
                Some(sqe) => unsafe {
                    let _ = sq.push(&sqe);
                },
                None => break,
            }
        }

        accept.push_to(&mut sq);

        for cqe in &mut cq {
            let ret = cqe.result();
            let token_index = cqe.user_data() as usize;

            if ret < 0 {
                eprintln!(
                    "token {:?} error: {:?}",
                    token_alloc.get(token_index),
                    io::Error::from_raw_os_error(-ret)
                );
                continue;
            }

            let token = &mut token_alloc[token_index];
            match token.clone() {
                Token::Accept => {
                    println!("accept");

                    accept.count += 1;

                    let fd = ret;
                    let (buf_index, buf) = match bufpool.pop() {
                        Some(buf_index) => (buf_index, &mut buf_alloc[buf_index]),
                        None => {
                            let buf = vec![0u8; 2048].into_boxed_slice();
                            let buf_entry = buf_alloc.vacant_entry();
                            let buf_index = buf_entry.key();
                            (buf_index, buf_entry.insert(buf))
                        }
                    };

                    *token = Token::Read { fd, buf_index };

                    let read_e = opcode::Recv::new(types::Fd(fd), buf.as_mut_ptr(), buf.len() as _)
                        .build()
                        .user_data(token_index as _);

                    unsafe {
                        if sq.push(&read_e).is_err() {
                            backlog.push_back(read_e);
                        }
                    }
                }
                Token::Read { fd, buf_index } => {
                    if ret == 0 {
                        bufpool.push(buf_index);
                        _ = token_alloc.remove(token_index);
                        println!("shutdown connection");
                        unsafe { _ = libc::close(fd) };

                        println!("Server closed");
                        return Ok(());
                    } else {
                        let len = ret as usize;
                        let buf = &buf_alloc[buf_index];

                        *token = Token::Write {
                            fd,
                            buf_index,
                            len,
                            offset: 0,
                        };

                        let write_e = opcode::Send::new(types::Fd(fd), buf.as_ptr(), len as _)
                            .build()
                            .user_data(token_index as _);

                        unsafe {
                            if sq.push(&write_e).is_err() {
                                backlog.push_back(write_e);
                            }
                        }
                    }
                }
                Token::Write {
                    fd,
                    buf_index,
                    offset,
                    len,
                } => {
                    let write_len = ret as usize;

                    let entry = if offset + write_len >= len {
                        bufpool.push(buf_index);

                        let (buf_index, buf) = match bufpool.pop() {
                            Some(buf_index) => (buf_index, &mut buf_alloc[buf_index]),
                            None => {
                                let buf = vec![0u8; 2048].into_boxed_slice();
                                let buf_entry = buf_alloc.vacant_entry();
                                let buf_index = buf_entry.key();
                                (buf_index, buf_entry.insert(buf))
                            }
                        };

                        *token = Token::Read { fd, buf_index };

                        opcode::Recv::new(types::Fd(fd), buf.as_mut_ptr(), buf.len() as _)
                            .build()
                            .user_data(token_index as _)
                    } else {
                        let offset = offset + write_len;
                        let len = len - offset;

                        let buf = &buf_alloc[buf_index][offset..];

                        *token = Token::Write {
                            fd,
                            buf_index,
                            offset,
                            len,
                        };

                        opcode::Write::new(types::Fd(fd), buf.as_ptr(), len as _)
                            .build()
                            .user_data(token_index as _)
                    };

                    unsafe {
                        if sq.push(&entry).is_err() {
                            backlog.push_back(entry);
                        }
                    }
                }
            }
        }
    }
}

fn crate_client(port: u16, server_started: Arc<AtomicBool>) {
    //等服务端起来
    while !server_started.load(Ordering::Acquire) {}
    let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), port);
    let mut stream = TcpStream::connect_timeout(&socket, Duration::from_secs(3))
        .unwrap_or_else(|_| panic!("connect to 127.0.0.1:{port} failed !"));
    let mut data: [u8; 512] = [b'1'; 512];
    data[511] = b'\n';
    let mut buffer: Vec<u8> = Vec::with_capacity(512);
    for _ in 0..3 {
        //写入stream流,如果写入失败,提示"写入失败"
        assert_eq!(512, stream.write(&data).expect("Failed to write!"));
        print!("Client Send: {}", String::from_utf8_lossy(&data[..]));

        let mut reader = BufReader::new(&stream);
        //一直读到换行为止(b'\n'中的b表示字节),读到buffer里面
        assert_eq!(
            512,
            reader
                .read_until(b'\n', &mut buffer)
                .expect("Failed to read into buffer")
        );
        print!("Client Received: {}", String::from_utf8_lossy(&buffer[..]));
        assert_eq!(&data, &buffer as &[u8]);
        buffer.clear();
    }
    //发送终止符
    assert_eq!(1, stream.write(&[b'e']).expect("Failed to write!"));
    println!("client closed");
}

#[test]
fn original() -> anyhow::Result<()> {
    let port = 7060;
    let server_started = Arc::new(AtomicBool::new(false));
    let clone = server_started.clone();
    let handle = std::thread::spawn(move || crate_server(port, clone));
    std::thread::spawn(move || crate_client(port, server_started))
        .join()
        .expect("client has error");
    handle.join().expect("server has error")
}

fn crate_server2(port: u16, server_started: Arc<AtomicBool>) -> anyhow::Result<()> {
    let operator = Operator::new(0)?;
    let listener = TcpListener::bind(("127.0.0.1", port))?;

    let mut bufpool = Vec::with_capacity(64);
    let mut buf_alloc = Slab::with_capacity(64);
    let mut token_alloc = Slab::with_capacity(64);

    println!("listen {}", listener.local_addr()?);
    server_started.store(true, Ordering::Release);

    operator.accept4(
        token_alloc.insert(Token::Accept),
        listener.as_raw_fd(),
        ptr::null_mut(),
        ptr::null_mut(),
        libc::SOCK_CLOEXEC,
    )?;

    loop {
        let (_, mut cq, _) = operator.select(None, 1)?;

        for cqe in &mut cq {
            let ret = cqe.result();
            let token_index = cqe.user_data() as usize;

            if ret < 0 {
                eprintln!(
                    "token {:?} error: {:?}",
                    token_alloc.get(token_index),
                    io::Error::from_raw_os_error(-ret)
                );
                continue;
            }

            let token = &mut token_alloc[token_index];
            match token.clone() {
                Token::Accept => {
                    println!("accept");

                    let fd = ret;
                    let (buf_index, buf) = match bufpool.pop() {
                        Some(buf_index) => (buf_index, &mut buf_alloc[buf_index]),
                        None => {
                            let buf = vec![0u8; 2048].into_boxed_slice();
                            let buf_entry = buf_alloc.vacant_entry();
                            let buf_index = buf_entry.key();
                            (buf_index, buf_entry.insert(buf))
                        }
                    };

                    *token = Token::Read { fd, buf_index };

                    operator.recv(token_index, fd, buf.as_mut_ptr() as _, buf.len(), 0)?;
                }
                Token::Read { fd, buf_index } => {
                    if ret == 0 {
                        bufpool.push(buf_index);
                        _ = token_alloc.remove(token_index);
                        println!("shutdown connection");
                        unsafe { _ = libc::close(fd) };

                        println!("Server closed");
                        return Ok(());
                    } else {
                        let len = ret as usize;
                        let buf = &buf_alloc[buf_index];

                        *token = Token::Write {
                            fd,
                            buf_index,
                            len,
                            offset: 0,
                        };

                        operator.send(token_index, fd, buf.as_ptr() as _, len, 0)?;
                    }
                }
                Token::Write {
                    fd,
                    buf_index,
                    offset,
                    len,
                } => {
                    let write_len = ret as usize;

                    if offset + write_len >= len {
                        bufpool.push(buf_index);

                        let (buf_index, buf) = match bufpool.pop() {
                            Some(buf_index) => (buf_index, &mut buf_alloc[buf_index]),
                            None => {
                                let buf = vec![0u8; 2048].into_boxed_slice();
                                let buf_entry = buf_alloc.vacant_entry();
                                let buf_index = buf_entry.key();
                                (buf_index, buf_entry.insert(buf))
                            }
                        };

                        *token = Token::Read { fd, buf_index };

                        operator.recv(token_index, fd, buf.as_mut_ptr() as _, buf.len(), 0)?;
                    } else {
                        let offset = offset + write_len;
                        let len = len - offset;

                        let buf = &buf_alloc[buf_index][offset..];

                        *token = Token::Write {
                            fd,
                            buf_index,
                            offset,
                            len,
                        };

                        operator.write(token_index, fd, buf.as_ptr() as _, len)?;
                    };
                }
            }
        }
    }
}

#[test]
fn framework() -> anyhow::Result<()> {
    let port = 7061;
    let server_started = Arc::new(AtomicBool::new(false));
    let clone = server_started.clone();
    let handle = std::thread::spawn(move || crate_server2(port, clone));
    std::thread::spawn(move || crate_client(port, server_started))
        .join()
        .expect("client has error");
    handle.join().expect("server has error")
}