The nanomsg-haskell package

[Tags:library, mit]

This is a Haskell binding for the nanomsg library: http://nanomsg.org/. There's support for blocking send and recv, a non-blocking receive, and for all the socket types and the functions you need to wire them up and tear them down again. Most sockets options are available through accessor and mutator functions. Sockets are typed, transports are not.


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Properties

Versions 0.1.0, 0.1.1, 0.1.2, 0.2.0, 0.2.1.1, 0.2.2, 0.2.3
Dependencies base (==4.*), bytestring (>=0.9.0 && <0.11) [details]
License MIT
Copyright Copyright (c) 2013 the nanomsg-haskell authors
Author See AUTHORS file
Maintainer <ivar.nymoen@gmail.com>
Stability Unknown
Category Network
Home page https://github.com/ivarnymoen/nanomsg-haskell
Source repository head: git clone https://github.com/ivarnymoen/nanomsg-haskell
Uploaded Sat Oct 26 07:29:24 UTC 2013 by inymoen
Distributions NixOS:0.2.3
Downloads 1285 total (15 in the last 30 days)
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Status Docs uploaded by user
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Readme for nanomsg-haskell

Readme for nanomsg-haskell-0.1.0

nanomsg-haskell

This is a Haskell binding for the nanomsg library: http://nanomsg.org/.

There's support for blocking send and recv, a non-blocking receive, and for all the socket types and the functions you need to wire them up and tear them down again.

Most socket options are available through accessor and mutator functions. Sockets are typed, transports are not.

Building

You would normally make sure the nanomsg library is on your system and then install from Hackage using "cabal update && cabal install nanomsg-haskell", but can build from the repository following these steps:

  1. Build and install nanomsg (and zmq3, if you are building benchmarks)
  2. git clone https://github.com/ivarnymoen/nanomsg-haskell
  3. cd nanomsg-haskell && cabal sandbox init
  4. cabal install --dependencies-only [--enable-tests] [--enable-benchmarks]
  5. cabal configure [--enable-tests] [--enable-benchmarks]
  6. cabal build
  7. [cabal test]

Contributing

Just submit a pull request for small stuff, but please get in touch beforehand before sinking a lot of effort into major/API changes.

Remember adding your name to the AUTHORS file.

Usage

Simple Pub/sub example:

Server:

module Main where

import Nanomsg
import qualified Data.ByteString.Char8 as C
import Control.Monad (mapM_)
import Control.Concurrent (threadDelay)

main :: IO ()
main = do
    withSocket Pub $ \s -> do
        _ <- bind s "tcp://*:5560"
        mapM_ (\num -> sendNumber s num) (cycle [1..1000000])
    where
        sendNumber s number = do
            threadDelay 1000        -- let's conserve some cycles
            let numAsString = show number
            send s (C.pack numAsString)

Client:

module Main where

import Nanomsg
import qualified Data.ByteString.Char8 as C
import Control.Monad (forever)

main :: IO ()
main = do
    withSocket Sub $ \s -> do
        _ <- connect s "tcp://localhost:5560"
        subscribe s $ C.pack ""
        forever $ do
            msg <- recv s
            C.putStrLn msg

Nonblocking client:

module Main where

import Nanomsg
import qualified Data.ByteString.Char8 as C
import Control.Monad (forever)
import Control.Concurrent (threadDelay)

main :: IO ()
main =
    withSocket Sub $ \s -> do
        _ <- connect s "tcp://localhost:5560"
        subscribe s $ C.pack ""
        forever $ do
            threadDelay 700           -- let's conserve some cycles
            msg <- recv' s
            C.putStrLn $ case msg of
                Nothing -> C.pack "No message"
                Just s  -> s