Transaction Service

The Transfer Service provides some methods to let the user to send transactions between two addresses, as well as subscribe to listen for transfers and adapt transfers.

The service needs a config object and a service of ethereum transactions, that is included in EthereumClient.

    public EthereumTokenService(HancockConfig config, EthereumTransactionService transactionClient) {
        this.config = config;
        this.transactionClient = transactionClient;
    }

Send

Send a transaction of ether between to accounts to the network according to the specification in the txConfig. Could be signed and then sent, sent to a sign provider before send it to the dlt or sent it assuming that the node has this account unlocked. Internally it call to the send of Transaction service.


  * @param tx       Data of the transaction (sender address, receiver addres, amount of ether, data)
  * @param txConfig Configuration of how the transaction will be send to the network
  * @return The result of the request
  * @throws Exception

ethereumClient.getTransferService().send(tx, txConfig);

Adapt Transfer

Adapt a transaction to get all the info necessary before send it, that is: nonce, gas and gasPrice. Return the transaction ready to be signed.


  * @param txRequest The transaction with the minimum data to be fill (From, To, Value)
  * @return The transaction with all the data fill (Gas, GasPrice, Nonce)
  * @throws Exception

ethereumClient.getTransferService().adaptTransfer(tx, txConfig);

Subscribe

Create a websocket subscription with the broker to watch transactions of type "transfer" in the network.


  * @param addresses An array of address that will be added to the watch list
  * @param consumer  A consumer plugin previously configured in hancock that will handle each received event
  * @return A HancockSocket object which can add new subscriptions and listen incoming message
  * @throws HancockException

ethereumClient.getTransferService().subscribe(addresses, consumer);
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