echosrv 0.3.0

A high-performance set of async echo server library built with Tokio for testing and development environments
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
123
124
125
126
127
128
129
130
131
132
133
134
135

use crate::Result;
use crate::common::EchoClient;
use crate::unix::datagram_protocol::{UnixDatagramExt, UnixDatagramProtocol};
use crate::unix::stream_protocol::{ManagedUnixStream, Protocol, StreamExt};
use async_trait::async_trait;
use std::path::PathBuf;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio::net::UnixDatagram;

/// Unix domain stream echo client
///
/// This client connects to Unix domain stream servers and can send
/// data to be echoed back. It's optimized for inter-process communication
/// on Unix-like systems.
///
/// # Examples
///
/// ```no_run
/// use echosrv::unix::UnixStreamEchoClient;
/// use echosrv::common::EchoClient;
/// use std::path::PathBuf;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
///     let socket_path = PathBuf::from("/tmp/echo.sock");
///     let mut client = UnixStreamEchoClient::connect(socket_path).await?;
///     
///     let response = client.echo_string("Hello, Unix Stream Server!").await?;
///     println!("Server echoed: {}", response);
///     Ok(())
/// }
/// ```
pub struct UnixStreamEchoClient {
    stream: ManagedUnixStream,
}

impl UnixStreamEchoClient {
    /// Connects to a Unix domain stream echo server at the given socket path
    pub async fn connect(socket_path: PathBuf) -> Result<Self> {
        let stream = Protocol::connect_unix(&socket_path).await?;
        Ok(Self { stream })
    }
}

#[async_trait]
impl EchoClient for UnixStreamEchoClient {
    async fn echo(&mut self, data: &[u8]) -> Result<Vec<u8>> {
        // Send the data
        self.stream
            .write_all(data)
            .await
            .map_err(crate::EchoError::Unix)?;
        self.stream.flush().await.map_err(crate::EchoError::Unix)?;

        // Read the echoed response
        let mut buffer = vec![0u8; data.len()];
        let mut response = Vec::new();
        let mut total_read = 0;

        while total_read < data.len() {
            let n = self
                .stream
                .read(&mut buffer)
                .await
                .map_err(crate::EchoError::Unix)?;
            if n == 0 {
                break; // Connection closed
            }
            response.extend_from_slice(&buffer[..n]);
            total_read += n;
        }

        Ok(response)
    }
}

/// Unix domain datagram echo client
///
/// This client connects to Unix domain datagram servers and can send
/// data to be echoed back. It's optimized for connectionless inter-process
/// communication on Unix-like systems.
///
/// # Examples
///
/// ```no_run
/// use echosrv::unix::UnixDatagramEchoClient;
/// use echosrv::common::EchoClient;
/// use std::path::PathBuf;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
///     let socket_path = PathBuf::from("/tmp/echo_dgram.sock");
///     let mut client = UnixDatagramEchoClient::connect(socket_path).await?;
///     
///     let response = client.echo_string("Hello, Unix Datagram Server!").await?;
///     println!("Server echoed: {}", response);
///     Ok(())
/// }
/// ```
pub struct UnixDatagramEchoClient {
    socket: UnixDatagram,
    server_path: PathBuf,
}

impl UnixDatagramEchoClient {
    /// Connects to a Unix domain datagram echo server at the given socket path
    pub async fn connect(server_path: PathBuf) -> Result<Self> {
        let socket = UnixDatagramProtocol::connect_unix(&server_path).await?;
        Ok(Self {
            socket,
            server_path,
        })
    }
}

#[async_trait]
impl EchoClient for UnixDatagramEchoClient {
    async fn echo(&mut self, data: &[u8]) -> Result<Vec<u8>> {
        // Send the data to the server
        self.socket
            .send_to(data, &self.server_path)
            .await
            .map_err(crate::EchoError::Unix)?;

        // Receive the echoed response
        let mut buffer = vec![0u8; data.len()];
        let (len, _) = self
            .socket
            .recv_from(&mut buffer)
            .await
            .map_err(crate::EchoError::Unix)?;

        Ok(buffer[..len].to_vec())
    }
}