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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

pub mod mux;
mod packet;
mod sink;
mod stream;

pub use packet::*;
pub use sink::*;
pub use stream::*;

use core::future::Future;
use core::pin::Pin;

type PinFut<O> = Pin<Box<dyn Future<Output = O> + 'static>>;

#[cfg(test)]
mod tests {
    use super::*;
    use byteorder::{BigEndian, ByteOrder};
    use futures::executor::block_on;
    use futures::io::AsyncReadExt;
    use futures::stream::StreamExt;
    use futures::{future::join, stream::iter, SinkExt, TryStreamExt};

    #[test]
    fn encode() {
        let mut p = Packet::new(IsStream::Yes, IsEnd::No, BodyType::Json, 123, vec![0; 25]);

        let expected_head: [u8; 9] = [0b0000_1010, 0, 0, 0, 25, 0, 0, 0, 123];
        assert_eq!(p.flags(), expected_head[0]);
        assert_eq!(p.header(), expected_head);

        p.end = IsEnd::Yes;
        p.stream = IsStream::No;
        p.body_type = BodyType::Binary;
        assert_eq!(p.flags(), 0b0000_0100);
    }

    #[test]
    fn decode() {
        let head: [u8; 9] = [0b0000_1101, 0, 0, 0, 25, 0, 0, 0, 200];
        let body_len = BigEndian::read_u32(&head[1..5]);
        let id = BigEndian::read_i32(&head[5..]);

        assert_eq!(body_len, 25);
        assert_eq!(id, 200);

        let p = Packet::new(
            head[0].into(),
            head[0].into(),
            head[0].into(),
            id,
            vec![0; body_len as usize],
        );

        assert_eq!(p.header(), head);
    }

    #[test]
    fn sink_stream() {
        let msgs = vec![
            Packet::new(
                IsStream::Yes,
                IsEnd::No,
                BodyType::Binary,
                10,
                vec![1, 2, 3, 4, 5],
            ),
            Packet::new(
                IsStream::No,
                IsEnd::Yes,
                BodyType::Utf8,
                2002,
                (0..50).collect(),
            ),
            Packet::new(
                IsStream::Yes,
                IsEnd::Yes,
                BodyType::Json,
                12345,
                (0..100).collect(),
            ),
        ];

        let msgs_clone = msgs.clone();

        let (w, r) = async_ringbuffer::ring_buffer(1024);

        let mut sink = PacketSink::new(w);
        let stream = PacketStream::new(r);

        let send = async {
            let mut items = iter(msgs).map(|m| Ok(m));
            sink.send_all(&mut items).await.unwrap();
            sink.close().await.unwrap();
        };

        let recv = async {
            let r: Vec<Packet> = stream.try_collect().await.unwrap();
            r
        };

        let (_, received) = block_on(async { join(send, recv).await });

        for (i, msg) in received.iter().enumerate() {
            assert_eq!(msg, &msgs_clone[i]);
        }
    }

    #[test]
    fn close() {
        let (w, r) = async_ringbuffer::ring_buffer(64);

        let mut sink = PacketSink::new(w);
        let mut stream = PacketStream::new(r);

        block_on(async {
            sink.send(Packet::new(
                IsStream::Yes,
                IsEnd::No,
                BodyType::Utf8,
                10,
                vec![1, 2, 3, 4, 5],
            ))
            .await
            .unwrap();

            let p = stream.try_next().await.unwrap().unwrap();
            assert!(p.is_stream());
            assert!(!p.is_end());
            assert_eq!(p.body_type, BodyType::Utf8);
            assert_eq!(p.id, 10);
            assert_eq!(&p.body, &[1, 2, 3, 4, 5]);

            sink.close().await.unwrap();

            let w = sink.into_inner();
            assert!(w.is_closed());

            let p = stream.try_next().await.unwrap();
            assert!(p.is_none());
            assert!(stream.is_closed());
        });
    }

    #[test]
    fn goodbye() {
        let (w, mut r) = async_ringbuffer::ring_buffer(64);

        let mut sink = PacketSink::new(w);

        block_on(async {
            sink.send(Packet::new(
                IsStream::Yes,
                IsEnd::No,
                BodyType::Utf8,
                10,
                vec![1, 2, 3, 4, 5],
            ))
            .await
            .unwrap();

            sink.close().await.unwrap();

            let mut tmp = [0; 14];
            let n = r.read(&mut tmp).await.unwrap();
            assert_eq!(n, 14);

            assert_eq!(&tmp, &[0b0000_1001, 0, 0, 0, 5, 0, 0, 0, 10, 1, 2, 3, 4, 5]);

            let mut head = [0; 9];
            let n = r.read(&mut head).await.unwrap();
            assert_eq!(n, 9);
            // goodbye header is 9 zeros
            assert_eq!(&head, &[0; 9]);

            let n = r.read(&mut head).await.unwrap();
            assert_eq!(n, 0);
        });
    }
}