Function rserver::read_stream

source · 
pub async fn read_stream(
    stream: &mut TcpStream
) -> Result<Vec<u8>, Box<dyn Error + Send + Sync>>
Expand description

Read data from a TcpStream. Data is returned as Vec (bytes).

Examples found in repository?
src/server.rs (line 49)
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async fn handle_client(
    client: &mut TcpStream,
    config: Config,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let request_buffer = read_stream(client).await?;
    println!(
        "******************* Request Received *****************\n{}\n",
        String::from_utf8_lossy(&request_buffer).trim()
    );
    let request = Request::from(request_buffer);
    // println!("request: {:?}", request);
    connect_and_handle_client_request(client, request, &config).await?;
    Ok(())
}

/// Read data from a TcpStream. Data is returned as Vec<u8> (bytes).
pub async fn read_stream(
    stream: &mut TcpStream,
) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
    let mut buffer: Vec<u8> = Vec::new();
    let ready = stream.ready(Interest::READABLE).await?;
    // println!("Stream: {:?}", stream);
    // println!("Ready to read: {:?}", ready);
    if ready.is_readable() {
        let buffer_size: usize = 1024;
        loop {
            let mut fixed_buffer = vec![0; buffer_size];
            match stream.read(&mut fixed_buffer).await {
                Ok(n) if n == 0 => break,
                Ok(n) if n < buffer_size => {
                    buffer.append(&mut fixed_buffer[..n].to_vec());
                    break;
                }
                Ok(_) => {
                    buffer.append(&mut fixed_buffer);
                }
                Err(e) => {
                    println!("Error in reading stram data: {}", e);
                    break;
                }
            }
        }
    }
    Ok(buffer)
}

/// Connect to remote address or proxy & handle client request.
async fn connect_and_handle_client_request(
    client: &mut TcpStream,
    request: Request,
    config: &Config,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    println!("Handling client request....");
    let address = if config.enable_proxy {
        format!("{}:{}", config.proxy_host, config.proxy_port)
    } else {
        format!("{}:{}", request.host, request.port)
    };
    println!("Connecting to the remote host ({})", address);
    let mut remote = TcpStream::connect(address.clone()).await?;
    println!("Connected to the remote host ({})", address);
    match request.method.as_str() {
        "CONNECT" => handle_connect(client, request, &mut remote).await?,
        _ => handle_default(client, request, &mut remote).await?,
    }

    // remote.flush().await?;
    // client.flush().await?;
    // remote.shutdown().await?;
    // client.shutdown().await?;
    println!("******** Complete Response sent to the client ********\n");

    Ok(())
}

/// Handle requests which are not CONNECT, i.e. GET, POST, etc.
async fn handle_default(
    client: &mut TcpStream,
    request: Request,
    remote: &mut TcpStream,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    println!("Handling non-HTTPS request....");
    match remote.write(&request.raw_data).await {
        Ok(n) => println!(
            "Wrote {} bytes and data to remote: {:?}",
            n,
            String::from_utf8_lossy(&request.raw_data)
        ),
        Err(e) => println!("Write error in remote: {}", e),
    }
    match read_stream(remote).await {
        Ok(response) => {
            println!(
                "Read {} bytes and data from server: {:?}",
                response.len(),
                String::from_utf8_lossy(&response)
            );
            match client.write(&response).await {
                Ok(n) => println!(
                    "Wrote {} bytes and data to client: {:?}",
                    n,
                    String::from_utf8_lossy(&response)
                ),
                Err(e) => println!("Write error in client: {}", e),
            }
        }
        Err(e) => println!("Write error in client: {}", e),
    }
    Ok(())
}