web3
Ethereum API for Haskell
https://github.com/airalab/hs-web3#readme
| Version on this page: | 0.8.3.1 |
| LTS Haskell 14.27: | 0.8.3.2 |
| Stackage Nightly 2019-09-21: | 0.8.3.2 |
| Latest on Hackage: | 1.0.0.0 |
Maintained by mail@akru.me
This version can be pinned in stack with:
web3-0.8.3.1@sha256:741d357ee3db48babf1d395f0e59843dd69c48d04c353802b7b613f62af6c3b4,14487Module documentation for 0.8.3.1
- Crypto
- Data
- Data.ByteArray
- Data.Solidity
- Data.String
- Language
- Language.Solidity
- Network
- Network.Ethereum
- Network.JsonRpc
Depends on 28 packages(full list with versions):
aeson, async, base, basement, bytestring, cereal, cryptonite, data-default, exceptions, generics-sop, http-client, http-client-tls, machines, memory, microlens, microlens-aeson, microlens-mtl, microlens-th, mtl, OneTuple, parsec, relapse, tagged, template-haskell, text, transformers, uuid-types, vinyl
Ethereum API for Haskell
The Haskell Ethereum API which implements the Generic JSON RPC.
Install
stack install web3
Usage
{-# LANGUAGE OverloadedStrings #-}
module Main where
-- Basic imports
import Network.Ethereum.Web3
-- Eth API support
import qualified Network.Ethereum.Api.Eth as Eth
import Network.Ethereum.Api.Types
-- ENS support
import qualified Network.Ethereum.Ens as Ens
-- Lens to simple param setting
import Lens.Micro ((.~))
main :: IO ()
main = do
-- Use default provider on http://localhost:8545
ret <- runWeb3 $ do
-- Get address of default account
me <- head <$> Eth.accounts
-- Get balance of default account on latest block
myBalance <- Eth.getBalance me Latest
-- Get half of balance
let halfBalance = fromWei (myBalance / 2)
-- Use default account
withAccount () $ do
-- Get Ethereum address via ENS
alice <- Ens.resolve "alice.address.on.eth"
bob <- Ens.resolve "bob.address.on.eth"
-- Send transaction with value
withParam (value .~ halfBalance) $ do
-- Send transaction to alice account
withParam (to .~ alice) $ send ()
-- Send transaction to bob account
withParam (to .~ bob) $ send ()
-- Return sended value
return halfBalance
-- Web3 error handling
case ret of
Left e -> error $ show e
Right v -> print (v :: Ether) -- Print returned value in ethers
Read more in the documentation on ReadTheDocs.