Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

/// @title A contract for sending and logging messages as an abstract data bus
/// @notice This smart contract serves as an abstract data bus, which can be utilized to facilitate lightweight, inter-service communication.
/// @dev The contract uses an anonymous event to broadcast messages with minimalistic implementation and low gas consumption. It does not require support and administration.
contract DataBus {
    /// @notice Emitted when a message is sent through the data bus
    /// @param eventId An arbitrary set of bytes that can encode the name and version; it serves as the unique identifier for each event
    /// @param sender The address of the transaction initiator; it is expected that the receiving side will filter based on known senders without explicit authorization
    /// @param data Arbitrary data encoded as bytes, representing the payload of the message
    event Message(
        bytes32 indexed eventId,
        address indexed sender,
        bytes data
    ) anonymous;

    /// @notice Sends a message with the specified `eventId` and `data`
    /// @dev Emits the `anonymous` event containing the message details; this method can be called by any sender to broadcast information
    /// @param _eventId The unique identifier for the message event
    /// @param _data The payload of the message to be sent
    function sendMessage(bytes32 _eventId, bytes calldata _data) external {
        emit Message(_eventId, msg.sender, _data);
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes32","name":"eventId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Message","type":"event"},{"inputs":[{"internalType":"bytes32","name":"_eventId","type":"bytes32"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"sendMessage","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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