flv-future-aio 1.1.0

I/O futures for Fluvio project
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

use std::io::Error as IoError;
use std::fmt;

#[cfg(unix)]
use std::os::unix::io::AsRawFd;

use nix::sys::sendfile::sendfile;
use nix::Error as NixError;
use async_trait::async_trait;

use crate::task::spawn_blocking;
use crate::net::TcpStream;


use crate::fs::AsyncFileSlice;

#[derive(Debug)]
pub enum SendFileError {
    IoError(IoError),
    NixError(NixError),
}

impl fmt::Display for SendFileError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Self::IoError(err) => write!(f, "{}", err),
            Self::NixError(err) => write!(f, "{}", err),
        }
    }
}

impl From<IoError> for SendFileError {
    fn from(error: IoError) -> Self {
        SendFileError::IoError(error)
    }
}

impl From<NixError> for SendFileError {
    fn from(error: NixError) -> Self {
        SendFileError::NixError(error)
    }
}

/// zero copy write
#[async_trait]
pub trait ZeroCopyWrite: AsRawFd {
    async fn zero_copy_write(&mut self, source: &AsyncFileSlice) -> Result<usize, SendFileError> {
        let size = source.len();
        let target_fd = self.as_raw_fd();
        let source_fd = source.fd();

        #[cfg(target_os = "linux")]
        let ft = {
            let mut offset = source.position() as i64;
            spawn_blocking(move || {
                sendfile(target_fd, source_fd, Some(&mut offset), size as usize)
                    .map_err(|err| err.into())
            })
        };

        #[cfg(target_os = "macos")]
        let ft = {
            let offset = source.position();
            spawn_blocking(move || {
                log::trace!(
                    "mac zero copy source fd: {} offset: {} len: {}, target: fd{}",
                    source_fd,
                    offset,
                    size,
                    target_fd
                );
                let (res, len) = sendfile(
                    source_fd,
                    target_fd,
                    offset as i64,
                    Some(size as i64),
                    None,
                    None,
                );
                match res {
                    Ok(_) => {
                        log::trace!("mac zero copy bytes transferred: {}", len);
                        Ok(len as usize)
                    }
                    Err(err) => {
                        log::error!("error sendfile: {}", err);
                        Err(err.into())
                    }
                }
            })
        };

        ft.await
    }
}

#[async_trait]
impl ZeroCopyWrite for TcpStream {}

#[cfg(test)]
mod tests {

    use std::net::SocketAddr;
    use std::time;

    use log::debug;
    use futures::stream::StreamExt;    
    use futures::future::join;

    use crate::net::TcpStream;
    use crate::net::TcpListener;
    use crate::io::AsyncReadExt;
    use crate::fs::util as file_util;
    use crate::zero_copy::ZeroCopyWrite;
    use crate::fs::AsyncFile;
    use crate::timer::sleep;
    use crate::test_async;

    use super::SendFileError;

    #[test_async]
    async fn test_zero_copy_from_fs_to_socket() -> Result<(), SendFileError> {
        // spawn tcp client and check contents
        let server = async {

            #[allow(unused_mut)]
            let mut listener = TcpListener::bind("127.0.0.1:9999").await?;
            
            debug!("server: listening");
            let mut incoming = listener.incoming();
            if let Some(stream) = incoming.next().await {
                debug!("server: got connection. waiting");
                let mut tcp_stream = stream?;
                let mut buf = [0; 30];
                let len = tcp_stream.read(&mut buf).await?;
                assert_eq!(len, 30);
            } else {
                assert!(false, "client should connect");
            }
            Ok(()) as Result<(), SendFileError>
        };

        let client = async {
            let file = file_util::open("test-data/apirequest.bin").await?;
            sleep(time::Duration::from_millis(100)).await;
            let addr = "127.0.0.1:9999".parse::<SocketAddr>().expect("parse");
            debug!("client: file loaded");
            let mut stream = TcpStream::connect(&addr).await?;
            debug!("client: connected to server");
            let f_slice = file.as_slice(0, None).await?;
            debug!("client: send back file using zero copy");
            stream.zero_copy_write(&f_slice).await?;
            Ok(()) as Result<(), SendFileError>
        };

        // read file and zero copy to tcp stream

        let _rt = join(client, server).await;
        Ok(())
    }
}