Adding more functions for retrieving onchain data to the EthereumService

[Gerson2102]

Feature: Core Ethereum Blockchain Data Retrieval Functions

This pull request introduces several new functions, each designed to retrieve specific blockchain information, and utilizes a structured request format.

Key Implemented Features:

• EthereumNodeRequest Structure:

  • Defines the input parameters for service calls, including:
    • node_url: String (Target Ethereum node)
    • block_number: Option<u64> (Optional block number, used by get_block, get_block_transactions, and get_account_balance)
    • transaction_hash: String (Used by get_transaction)
    • account_address: String (Used by get_account_balance)
  • The block_number is Option<u64>, allowing flexibility for functions like get_account_balance to default to the latest block if no number is provided.

• Service Functions Added:

  • get_block():
    • Retrieves and formats details for a specific block identified by request.block_number.
    • (Note: Currently uses request.block_number.unwrap(), assuming a block number will always be provided for this call.)
  • get_transaction():
    • Fetches detailed information for a transaction specified by request.transaction_hash.
    • Includes parsing the string hash to H256.
    • Formats output to show hash, sender, receiver, value, block number (or "Pending"), gas price, and gas limit.
  • get_block_transactions():
    • Lists transactions within a block specified by request.block_number.
    • Uses provider.get_block_with_txs() to retrieve full transaction objects.
    • Currently displays the first 10 transactions (.take(10)) from the block.
    • (Note: Currently uses request.block_number.unwrap(), assuming a block number will always be provided.)
  • get_account_balance():
    • Retrieves the ETH balance for request.account_address.
    • If request.block_number is Some(bn), fetches the balance at that specific block.
    • If request.block_number is None, fetches the balance at the latest block.
    • Converts the balance from Wei to ETH using ethers::utils::format_ether.
    • Parses the string address to ethers::types::Address.

How to Test:

The implemented functionalities can be invoked via the rmcp service layer:

• Call get_latest_block with a node URL.
• Call get_block with a node URL and a block number.
• Call get_transaction with a node URL and a transaction hash.
• Call get_block_transactions with a node URL and a block number.
• Call get_account_balance with a node URL, an account address, and optionally a block number.

[Gerson2102]

cc: @therustmonk