connexa 0.4.1

High level abtraction of rust-libp2p
Documentation 
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

use async_trait::async_trait;
use bytes::Bytes;
use futures::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
use libp2p::StreamProtocol;

#[derive(Debug, Copy, Clone)]
pub struct Codec {
    max_request_size: usize,
    max_response_size: usize,
}

impl Codec {
    pub fn new(max_request_size: usize, max_response_size: usize) -> Self {
        Self {
            max_response_size,
            max_request_size,
        }
    }
}

#[async_trait]
impl libp2p::request_response::Codec for Codec {
    type Protocol = StreamProtocol;
    type Request = Bytes;
    type Response = Bytes;

    async fn read_request<T>(
        &mut self,
        _: &Self::Protocol,
        io: &mut T,
    ) -> std::io::Result<Self::Request>
    where
        T: AsyncRead + Unpin + Send,
    {
        let mut buffer = Vec::new();
        io.take(self.max_request_size as u64)
            .read_to_end(&mut buffer)
            .await?;

        if buffer.is_empty() {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "request is empty",
            ));
        }
        Ok(Bytes::from(buffer))
    }

    async fn read_response<T>(
        &mut self,
        _: &Self::Protocol,
        io: &mut T,
    ) -> std::io::Result<Self::Response>
    where
        T: AsyncRead + Unpin + Send,
    {
        let mut buffer = Vec::new();
        io.take(self.max_response_size as u64)
            .read_to_end(&mut buffer)
            .await?;

        if buffer.is_empty() {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "response is empty",
            ));
        }
        Ok(Bytes::from(buffer))
    }

    async fn write_request<T>(
        &mut self,
        _: &Self::Protocol,
        io: &mut T,
        req: Self::Request,
    ) -> std::io::Result<()>
    where
        T: AsyncWrite + Unpin + Send,
    {
        if req.is_empty() {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "request is empty",
            ));
        }

        if req.len() > self.max_request_size {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "request exceeds max size",
            ));
        }

        io.write_all(&req).await?;
        Ok(())
    }

    async fn write_response<T>(
        &mut self,
        _: &Self::Protocol,
        io: &mut T,
        res: Self::Response,
    ) -> std::io::Result<()>
    where
        T: AsyncWrite + Unpin + Send,
    {
        if res.is_empty() {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "response is empty",
            ));
        }
        if res.len() > self.max_response_size {
            return Err(std::io::Error::new(
                std::io::ErrorKind::UnexpectedEof,
                "response exceeds max size",
            ));
        }
        io.write_all(&res).await?;
        Ok(())
    }
}