capnp: Cap'n Proto for Haskell

[ capnproto, data, library, mit, network, program, rpc, serialization ] [ Propose Tags ]

A native Haskell implementation of the Cap'N Proto cerialization format and RPC protocol.

The library implements serialization and level 1 RPC.

The Capnp.Tutorial module is the best place to start reading; the reference documentation can seem bewildering without that context.


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Versions [RSS] [faq] 0.1.0.0, 0.2.0.0, 0.3.0.0, 0.4.0.0, 0.5.0.0, 0.6.0.0, 0.6.0.1, 0.6.0.2, 0.6.0.3, 0.7.0.0, 0.8.0.0, 0.9.0.0, 0.10.0.0, 0.10.0.1, 0.11.0.0, 0.12.0.0, 0.12.1.0, 0.13.0.0, 0.14.0.0
Change log CHANGELOG.md
Dependencies async (>=2.2.1 && <2.3), base (>=4.14 && <5), bifunctors (>=5.5.8 && <5.6), bytes (>=0.15.4 && <0.18), bytestring (>=0.10 && <0.12), capnp, containers (>=0.5.9 && <0.7), data-default (>=0.7.1 && <0.8), data-default-instances-vector (>=0.0.1 && <0.1), directory (>=1.3.0 && <1.4), exceptions (>=0.10.0 && <0.11), filepath (>=1.4.2 && <1.5), focus (>=1.0.1 && <1.1), ghc-prim (>=0.6.1 && <0.8), hashable (>=1.2.7 && <1.4), lifetimes (==0.1.*), list-t (>=1.0.2 && <1.1), monad-stm (==0.1.*), mtl (>=2.2.2 && <2.3), network (>=3 && <3.2), network-simple (==0.4.*), pretty-show (>=1.9.5 && <1.11), primitive (>=0.6.3 && <0.8), safe-exceptions (>=0.1.7 && <0.2), stm (>=2.5.0 && <2.6), stm-containers (>=1.1.0 && <1.3), supervisors (>=0.2.1 && <0.3), template-haskell (>=2.16.0 && <2.18), text (>=1.2 && <2.0), transformers (>=0.5.2 && <0.7), vector (>=0.12.0 && <0.13), wl-pprint-text (==1.2.*) [details]
License MIT
Copyright 2016-2021 haskell-capnp contributors (see CONTRIBUTORS file).
Author Ian Denhardt
Maintainer ian@zenhack.net
Revised Revision 1 made by isd at 2021-09-08T02:15:17Z
Category Data, Serialization, Network, Rpc
Home page https://github.com/zenhack/haskell-capnp
Bug tracker https://github.com/zenhack/haskell-capnp/issues
Source repo head: git clone https://github.com/zenhack/haskell-capnp.git -b master
Uploaded by isd at 2021-08-15T20:15:11Z
Distributions NixOS:0.14.0.0
Executables capnpc-haskell
Downloads 3924 total (55 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2021-08-15 [all 1 reports]

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Readme for capnp-0.14.0.0

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A Haskell library for the Cap'N Proto Cerialization and RPC protocol.

Getting Started

There is a module Capnp.Tutorial which contains an introduction to the library; users are strongly encouraged to read this first, as the reference documentation can be bewildering without that context.

Status

Serialization support works, with some limitations:

  • We do not support defining custom default values for fields of pointer type; see (#28).
  • We currently do not correctly handle decoding lists of structs from non-composite lists (#27). This means that, contrary to the protocol evolution rules, it is not safe to change a field from type List(T) (where T is any non-struct type) to a list of a struct type.

Level 1 RPC support is implemented and usable, though it should be considered alpha quality for now. Specific things to be aware of:

  • The implementation is not robust against resource exhaustion attacks; for now users are strongly discouraged from using it to do RPC with untrusted peers.

The API is considered unstable. It will likely see changes, for the sake of polish, consistency, etc. as well as to improve performance and accommodate more features as we add them.