Network.Ethereum.Web3.Contract

Ethereum contract generalized interface, e.g. event function catch all event depend by given callback function type.

runWeb3 $ do
    event "0x..." $ (MyEvent a b c) ->
        liftIO $ print (a + b * c))

In other case call function used for constant calls (without transaction creation and change state), and sendTx function like a call but return no contract method return but created transaction hash.

runweb3 $ do
  x  <- call "0x.." Latest MySelector
  tx <- sendTx "0x.." nopay $ MySelector2 (x + 2)

Documentation

data EventAction

Event callback control response

Constructors

ContinueEvent

Continue to listen events

TerminateEvent

Terminate event listener

Instances

Eq EventAction

Methods

(==) :: EventAction -> EventAction -> Bool

(/=) :: EventAction -> EventAction -> Bool

Show EventAction

Methods

showsPrec :: Int -> EventAction -> ShowS

show :: EventAction -> String

showList :: [EventAction] -> ShowS

class ABIEncoding a => Method a where

Contract method caller

Methods

sendTx :: (Provider p, Unit b) => Address -> b -> a -> Web3 p TxHash

Send a transaction for given contract Address, value and input data

call :: (Provider p, ABIEncoding b) => Address -> CallMode -> a -> Web3 p b

Constant call given contract Address in mode and given input data

Instances

Method NoMethod

Methods

sendTx :: (Provider p, Unit b) => Address -> b -> NoMethod -> Web3 p TxHash

call :: (Provider p, ABIEncoding b) => Address -> CallMode -> NoMethod -> Web3 p b

class ABIEncoding a => Event a where

Contract event listener

Minimal complete definition

eventFilter

Methods

eventFilter :: a -> Address -> Filter

Event filter structure used by low-level subscription methods

event :: Provider p => Address -> (a -> Web3 p EventAction) -> Web3 p ThreadId

Start an event listener for given contract Address and callback

data NoMethod

Dummy method for sending transaction without method call

Constructors

NoMethod

Instances

ABIEncoding NoMethod

Methods

toDataBuilder :: NoMethod -> Builder

fromDataParser :: Parser NoMethod

toData :: NoMethod -> Text

fromData :: Text -> Maybe NoMethod

Method NoMethod

Methods

sendTx :: (Provider p, Unit b) => Address -> b -> NoMethod -> Web3 p TxHash

call :: (Provider p, ABIEncoding b) => Address -> CallMode -> NoMethod -> Web3 p b

nopay :: Wei

Zero value is used to send transaction without money