#Ethereum Common

The packages contains two launch files: erc20.launch and signer.launch. The last one is included in Robonomics Liability.

Below is the description for erc20 node which contains utils for convenient work with Ethereum accounts and XRT token.

#ROS Parameters

#~web3_http_provider

Web3 HTTP provider address. The type is string, defaults to http://127.0.0.1:8545

#~erc20_token

ERC20 token to work with. Type is string, defaults to xrt.5.robonomics.eth

#~factory_contract

The name of the liability factory. The type is string, defaults to factory.5.robonomics.eth

#~ens_contract

The checksumed address of ENS registry. The type is string, defaults to ""

#~keyfile

Path to keyfile. The type is string, defaults to "". Required parameter

#~keyfile_password_file

Path to a file with password for the keyfile. The type is string, defaults to "". Required parameter

#Published topics

#/eth/event/transfer (ethereum_common/TransferEvent)

The event ethereum_common/TransferEvent is emitted after the transfer of tokens was made

#/eth/event/approval (ethereum_common/ApprovalEvent)

The event ethereum_common/ApprovalEvent is emitted after the approval of tokens was made

#Services

#/eth/accounts (ethereum_common/Accounts)

List of available Ethereum accounts. See ethereum_common/Accounts

#/eth/account_eth_balance (ethereum_common/AccountBalance)

Returns the balance of the given address in Wei. See ethereum_common/AccountBalance

#/eth/eth_balance (ethereum_common/Balance)

Returns the balance of the default address. See :ref:Ethereum-common-Balance.srv

#/eth/current_block (ethereum_common/BlockNumber)

Returns current block number. See :ref:Ethereum-common-BlockNumber.srv

#/eth/transfer (ethereum_common/Transfer)

Transfers tokens from the default account to a given one. See :ref:Ethereum-common-Transfer.srv

#/eth/transfer_from (ethereum_common/TransferFrom)

Transfers tokens from a given account to another one. See :ref:Ethereum-common-TransferFrom.srv

#/eth/approve (ethereum_common/Approve)

Approves tokens from the default account to a given one. See :ref:Ethereum-common-Approve.srv

#/eth/account_xrt_balance (ethereum_common/AccountBalance)

Returns the XRT balance of a given account. See :ref:Ethereum-common-AccountBalance.srv

#/eth/xrt_balance (ethereum_common/Balance)

Return the XRT balance of the default account. See :ref:Ethereum-common-Balance.srv

#/eth/account_xrt_allowance (ethereum_common/AccountToAddressAllowance)

Returns how much one account is allowed to spend from another account. See :ref:Ethereum-common-AccountToAddressAllowance.srv

#/eth/xrt_allowance (ethereum_common/Allowance)

Returns how much the Factory is allowed to spend from the default account. See :ref:Ethereum-common-Allowance.srv