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Logging thoughts and approaches on getting (parts of) the Haskell ethereum client running in the browser.

Backends

There are a number of different alternatives. In order of appearance, I estimate the following to languages to need the least amount of porting.

• GHCJS supports full GHC
• Haste is full Haskell but with different libraries
• Fay is a proper subset of Haskell
• Elm is a Haskell-like language
• PureScript is inspired by Haskell

Stages

GHCJS

It can be a bit tricky to set up, it will only get really easy once GHC 7.10 is released on the Haskell Platform. For now I use the GHCJS Docker file, build it there in a sandbox and copy the files back into the host (I can't get GHCJS to build without cabal dependency issues).

• ethereum-rlp is working as-is

• ethereum-leveldb will need a workaround for the dependency of leveldb-haskell, and hence leveldb. It seems that ethereum-leveldb only uses basic functionality of leveldb-haskell (ie open/close/get/put). Possibilities are:

• • use node-levelup with the locket library as a backend for leveldb-haskell. Alternatives are level.js and MemDOWN UNTESTED
• • use locket directly under ethereum-leveldb. UNTESTED
• • use node-levelup with either

• There is also low-level C code for fast nonceNonceFinder:

• • Re-write this in Haskell (already existing?)
• • Re-write in JavaScript
• • Compile C-code with emscripten