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Ethereum: Client: How transactions are cleaned from transaction pool as they’re included into blocks (where in client codebase?)

Published by Terlumun Aondover on February 4th, 2025.

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How Ethereum Transactions Are Purged from the Client Codebase Event Pool

As we delve into the intricacies of Ethereum client codebases, particularly Geth, cpp-Ethereum, and OpenEthereum, it is important to understand how transactions are processed on the blockchain. One critical part of the client is the transaction pool processing, where incoming transactions are added to blocks for verification and validation.

In this article, we will focus on purging transactions from the client codebase event pool and highlight specific functions and their roles.

Client Codebase Overview

Ethereum client codebases provide a comprehensive implementation of the Ethereum Virtual Machine (EVM) architecture. They are responsible for:

Transaction Management: Processing incoming transactions, including confirmation and validation.

Block Management: Creating new blocks, updating existing ones, and deleting them from the blockchain.

Purging Transactions from the Transaction Pool

Let’s dive into how transactions are handled in the client codebase.

Ethereum: Client: How transactions are cleaned from transaction pool as they're included into blocks (where in client codebase?)

commitWork

commitWork is a function in the eth_blockstore module that commits a job to a block. It takes three arguments:

data: The data for the new block, including transaction IDs and values.

index: The index of the first unused input (UI) of the transaction.

gas_price: The gas price used to confirm the transaction.

The function purges transactions from the pool by removing them if they do not have enough funds to cover their costs. Specifically, it calls two functions:

“fillTransactions()”: This function is responsible for filling the transaction pool with new transactions that can be added to blocks.

“checkFees()” and “fillFee()”: These functions are used to check transaction fees and fill the remaining balance with gas.

fillTransactions()

“fillTransactions()” is a critical function when purging transactions from the pool. It takes three arguments:

txs: A list of transactions to add to the block.

“balance”: The current balance of the Ethereum account.

“gasPrice”: The gas price used to confirm the transaction.

The function iterates through each transaction and calculates its cost and available funds. If a transaction does not have enough funds or does not have enough interface to cover the cost, it is removed from the pool.

checkFees()

“checkFees()” is called after “fillTransactions()” to calculate the total transaction fees. It returns an array of fee ranges, allowing the client to decide which transactions to add to blocks based on the available balance and fees.

fillFee():

“fillFee()” calculates the remaining balance of the Ethereum account after adding new transactions to the pool. It is used to determine whether or not more transactions can be added.

In the client codebase

In Geth, cpp-Ethereum, and OpenEthereum, these operations are implemented as follows:

“Geth”: In the “eth_blockstore” module (“src/main.rs”), “commitWork()” is called directly from the “fillTransactions()” function.

cpp-Ethereum: There is a similar implementation in the src/main.cpp file for cleaning transactions.

OpenEthereum: The OpenEthereum codebase provides an even more detailed explanation of these operations in its source code (src/main.rs) and implementation (src/eth_blockstore.rs).

In summary, the client codebases perform different steps to clean transactions from the pool: