Crate runng

Rust high-level wrapper around NNG (Nanomsg-Next-Gen):

NNG, like its predecessors nanomsg (and to some extent ZeroMQ), is a lightweight, broker-less library, offering a simple API to solve common recurring messaging problems, such as publish/subscribe, RPC-style request/reply, or service discovery. The API frees the programmer from worrying about details like connection management, retries, and other common considerations, so that they can focus on the application instead of the plumbing.

Features:

• Use nng_aio for asynchronous I/O
• Use nng_ctx for advanced protocol handling
• Leverage futures crate for ease of use with tokio and eventual support of async/await

Examples

Simple:

use runng::*;
fn test() -> Result<(), NngFail> {
    const url: &str = "inproc://test";
    let factory = Latest::default();
    let rep = factory.replier_open()?.listen(&url)?;
    let req = factory.requester_open()?.dial(&url)?;
    req.send(msg::NngMsg::create()?)?;
    rep.recv()?;
    Ok(())
}

Asynchronous I/O:

use futures::{
    future::Future,
    stream::Stream,
};
use runng::{
    *,
    asyncio::*,
    protocol::*,
};

fn aio() -> NngReturn {
    const url: &str = "inproc://test";

    let factory = Latest::default();
    let mut rep_ctx = factory
        .replier_open()?
        .listen(&url)?
        .create_async_stream(1)?;

    let mut req_ctx = factory
        .requester_open()?
        .dial(&url)?
        .create_async()?;
    let req_future = req_ctx.send(msg::NngMsg::create()?);
    rep_ctx
        .receive()
        .unwrap()
        .take(1)
        .for_each(|_request| {
            let msg = msg::NngMsg::create().unwrap();
            rep_ctx.reply(msg).wait().unwrap().unwrap();
            Ok(())
        })
        .wait()?;
    req_future.wait().unwrap()?;

    Ok(())
}

Additional examples in examples/ folder.

Re-exports

pub use self::aio::*;

pub use self::ctx::*;

pub use self::factory::*;

pub use self::options::*;

pub use self::result::*;

pub use self::socket::*;

Modules

aio	Asynchronous I/O
asyncio	NNG protocols. See Section 7.
ctx	Protocol contexts
dialer	Dialer
factory
listener	Listener
msg
options	NNG options. See nng_options.
pipe	Pipe
protocol	NNG protocols. See Section 7.
result	Return values and error handling
socket	Socket basics
stats	Runtime statistics
transport	NNG transports. See Section 7.