@ethereumjs/blockchain
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A module to store and interact with blocks. |
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Note: this README
reflects the state of the library from v5.0.0
onwards. See README
from the standalone repository for an introduction on the last preceding release.
INSTALL
npm install @ethereumjs/blockchain
USAGE
Introduction
The following is an example to iterate through an existing Geth DB (needs level
to be installed separately).
This module performs write operations. Making a backup of your data before trying it is recommended. Otherwise, you can end up with a compromised DB state.
import Blockchain from '@ethereumjs/blockchain'
import Common, { Chain } from '@ethereumjs/common'
const level = require('level')
const gethDbPath = './chaindata'
const common = new Common({ chain: Chain.Ropsten })
const db = level(gethDbPath)
const blockchain = Blockchain.create({ common, db })
blockchain.iterator('i', (block) => {
const blockNumber = block.header.number.toString()
const blockHash = block.hash().toString('hex')
console.log(`Block ${blockNumber}: ${blockHash}`)
})
WARNING: Since @ethereumjs/blockchain
is also doing write operations on the DB for safety reasons only run this on a copy of your database, otherwise this might lead to a compromised DB state.
EIP-1559 Support
This library supports the handling of EIP-1559
blocks and transactions starting with the v5.3.0
release.
API
Documentation
DEVELOPER
For debugging blockchain control flows the debug library is used and can be activated on the CL with DEBUG=[Logger Selection] node [Your Script to Run].js
.
The following initial logger is currently available:
Logger | Description |
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blockchain:clique | Clique operations like updating the vote and/or signer list |
The following is an example for a logger run:
Run with the clique logger:
DEBUG=blockchain:clique ts-node test.ts
EthereumJS
See our organizational documentation for an introduction to EthereumJS
as well as information on current standards and best practices.
If you want to join for work or do improvements on the libraries have a look at our contribution guidelines.