Tcp-Handler

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Description

More conveniently use tokio::net::TcpStream to transfer bytes::Bytes data chunks.

You may use extra crate to read and write data, such as serde, postcard and variable-len-reader.

See tcp-server and tcp-client for conveniently building your tcp application.

Features

Based on tokio and bytes.
Support ReadHalf and WriteHalf of tokio::net::TcpStream. (In fact anything impl AsyncRead/AsyncWrite and Unpin can be used.)
Support bytes::Buf. So you can send discontinuous data chunks by calling chain.
Support encryption (rsa and aes).
Support compression (flate2).
Complete API document and data model.

Usage

Add this to your Cargo.toml:

[dependencies]
tcp-handler = "^1.0"

Note

If client_init using encryption mode is extremely slow in debug mode, please add this to your Cargo.toml in client side:

[profile.dev.package.num-bigint-dig]
opt-level = 3 # Speed up rsa key gen.

This is an issue in rsa crate.

Example

With TcpHandler, you can use all the protocols in a similar way.

use anyhow::{Error, Result};
use bytes::{Buf, BufMut, BytesMut};
use tcp_handler::raw::*;
use tokio::{spawn, try_join};
use tokio::net::{TcpListener, TcpStream};
use variable_len_reader::{VariableReader, VariableWriter};

#[tokio::main]
async fn main() -> Result<()> {
    // Create tcp stream.
    let server = TcpListener::bind("localhost:0").await?;
    let mut client = TcpStream::connect(server.local_addr()?).await?;
    let (mut server, _) = server.accept().await?;
    
    let client = spawn(async move {
        let mut client = TcpClientHandlerRaw::from_stream(client, "YourApplication", "1.0.0").await?;

        // Send.
        let mut writer = BytesMut::new().writer();
        writer.write_string("hello server.")?;
        client.send(&mut writer.into_inner()).await?;
      
        Ok::<_, Error>(())
    });
    let server = spawn(async move {
        let mut server = TcpServerHandlerRaw::from_stream(server, "YourApplication", |v| v == "1.0.0", "1.0.0").await?;
        assert_eq!(server.get_client_version(), "1.0.0");

        // Receive.
        let mut reader = server.recv().await?.reader();
        let res = reader.read_string()?;
        assert_eq!(res, "hello server.");

        Ok::<_, Error>(())
    });
    try_join!(client, server)?;
    Ok(())
}

Protocol Version

The protocol version code used internally. Note only when the server and client sides have the same code, they can connect normally.

crate version	protocol version
>=0.6.0	1
<0.6.0	0

License

Licensed under either of

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

tcp-handler 1.0.1