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

use std::io::prelude::*;
use image::RgbImage;

use message::*;

#[derive(Debug)]
pub struct Server<S: Read + Write> {
    messenger: Messenger<S>,
    dimensions: (u32, u32)
}

impl<S: Read + Write> Server<S> {
    pub fn new(stream: S, dimensions: (u32, u32)) -> Result<Server<S>, String> {
        let messenger = Messenger::new(stream);
       
        match messenger.send(&Message::Dimensions(dimensions)) {
            Err(e) => return Err(e),
            Ok(len) => println!("sent {} bytes", len)
        };

        Ok(Server {
            messenger,
            dimensions
        })
    }

    pub fn recv(&self) -> Result<RgbImage, String> {
        let message = match self.messenger.recv() { 
            Ok(m) => m,
            Err(e) => return Err(e)
        };


        match message {
            Message::RgbImage(raw) => {
                let (width, height) = self.dimensions;
                match RgbImage::from_raw(width, height, raw) {
                    Some(image) => Ok(image),
                    None => Err("Couldn't deserialize RgbImage: Mismatched dimensions".to_string())
                }
            },
            _ => Err("Unexpected Message, expected ImageData".to_string())
        }
    }
}


#[cfg(test)]
mod tests {
    use std::net::{TcpStream, TcpListener};
    use std::time;
    use image::Rgb;
    use rand::random;

    use super::*;
    use client::Client;
    
    fn server_client(dimensions: (u32, u32)) -> (Server<TcpStream>, Client<TcpStream>) {
        let server_addr = "127.0.0.1:31415";
        let listener = TcpListener::bind(server_addr).unwrap();
        let client_stream = TcpStream::connect(server_addr).unwrap();
        let (server_stream, _client_addr) = listener.accept().unwrap();

        let server = Server::new(server_stream, dimensions.clone()).unwrap();
        let client = Client::new(client_stream).unwrap();

        (server, client)
    }

    #[test]
    fn dimensions() {
        let dimensions = (64, 32);
        let (_server, client) = server_client(dimensions);
        assert_eq!(dimensions, client.dimensions());

        let (_server, client) = server_client(dimensions);
        let dimensions = (65, 32);
        assert_ne!(dimensions, client.dimensions());
    }

    #[test]
    fn simple_image() {
        let (width, height) = (64, 32);
        let (server, client) = server_client((width, height));
        let image = RgbImage::from_fn(width, height, |x, y| {
            let (x, y) = (x as u8, y as u8);
            if x.wrapping_mul(y) % 5 == 0 {
                Rgb([x, y, x.wrapping_add(y)])
            }
            else {
                Rgb([255u8.wrapping_sub(y), 255u8.wrapping_sub(x.wrapping_mul(y)), x.wrapping_add(y)])
            }
        });
        client.send(image.clone()).unwrap();
        let recieved_image = server.recv().unwrap();
        assert_eq!(image.into_raw(), recieved_image.into_raw());
    }

    fn framerate(minimum: u8) {
        let (width, height) = (64, 32);
        let (server, client) = server_client((width, height));
        let test_duration = time::Duration::new(2, 0);
        let start = time::Instant::now();
        let mut frames = 0;

        let image = RgbImage::from_fn(width, height, |_, _| {
            Rgb([random::<u8>(), random::<u8>(), random::<u8>()])
        });
        let image_raw = image.clone().into_raw();

        while time::Instant::now() - start < test_duration {
            let t0 = time::Instant::now();
            for _ in 0..10 {
                client.send(image.clone()).unwrap();
            }
            let t1 = time::Instant::now();
            for _ in 0..10 {
                let recieved_image = server.recv().unwrap();
                assert_eq!(image_raw, recieved_image.into_raw());
            }
            let t2 = time::Instant::now();
            frames += 10;
            println!("send:   {:?}", t1 - t0);
            println!("recv:   {:?}", t2 - t1);
            println!("total : {:?}", t2 - t0);
            println!("===============");
        }

        let rate = (frames / test_duration.as_secs()) as u8;
        println!("Framerate: {}, minimum: {}", rate, minimum);
        assert!(rate >= minimum);
    }

    #[test]
    fn framerate_20() {
        framerate(20);
    }
    
    #[test]
    fn framerate_40() {
        framerate(40);
    }

    #[test]
    fn framerate_60() {
        framerate(60);
    }
}