EthTx transaction decoder.


License
Apache-2.0
Install
pip install EthTx==0.3.1

Documentation

EthTx - Ethereum transactions decoder

Python Black OpenSource Apache

Live version

Live version of EthTx is available here https://EthTx.info, with source code released here https://github.com/ethtx/ethtx

Installation

pip install ethtx

Requirements

The package needs a few external resources, defined in EthTxConfig object:

  1. Erigon/Geth node - required to have access to the raw Ethereum data; it must be a full archive node with the debug option ON
  2. Etherscan API key - required to get the source code and ABI for smart contracts used in transaction
  3. (Optional) MongoDB database - required to store smart contracts' ABI and semantics used in the decoding process. If you don't want to setup permanent database, you can enter mongomock://localhost, then in-memory mongo will be set up that discards all data with every run.

Getting started

from ethtx import EthTx, EthTxConfig
from ethtx.models.decoded_model import DecodedTransaction


ethtx_config = EthTxConfig(
    mongo_connection_string="mongomock://localhost" ##MongoDB connection string,
    mongo_database="" ##MongoDB database,
    etherscan_api_key="" ##Etherscan API key,
    web3nodes={
        "mainnet": {
            "hook": "_Geth_archive_node_URL_",
            "poa": _POA_chain_indicator_ # represented by bool value
        }
    },
    default_chain="mainnet",
    etherscan_urls={
        "mainnet": "https://api.etherscan.io/api",
    },
)

ethtx = EthTx.initialize(ethtx_config)
transaction: DecodedTransaction = ethtx.decoders.decode_transaction('0x50051e0a6f216ab9484c2080001c7e12d5138250acee1f4b7c725b8fb6bb922d')

Features

EthTx most important functions:

  1. Raw node data access:
ethtx = EthTx.initialize(ethtx_config)
web3provider = ethtx.providers.web3provider

from ethtx.models.w3_model import W3Transaction, W3Block, W3Receipt, W3CallTree

# read raw transaction data directly from the node
w3transaction: W3Transaction = web3provider.get_transaction('0x50051e0a6f216ab9484c2080001c7e12d5138250acee1f4b7c725b8fb6bb922d')
w3block: W3Block = web3provider.get_block(w3transaction.blockNumber)
w3receipt: W3Receipt = web3provider.get_receipt(w3transaction.hash.hex())
w3calls: W3CallTree = web3provider.get_calls(w3transaction.hash.hex()
  1. ABI decoding:
from ethtx.models.objects_model import Transaction, Event, Call
from ethtx.models.decoded_model import DecodedEvent, DecodedCall, DecodedTransfer, DecodedBalance

# read the raw transaction from the node
transaction: Transaction = web3provider.get_full_transaction('0x50051e0a6f216ab9484c2080001c7e12d5138250acee1f4b7c725b8fb6bb922d')

# decode transaction components
abi_decoded_events: List[Event] = ethtx.decoders.abi_decoder.decode_events(transaction.events, transaction.metadata)
abi_decoded_calls: DecodedCall = ethtx.decoders.abi_decoder.decode_calls(transaction.root_call, transaction.metadata)
abi_decoded_transfers: List[DecodedTransfer] = ethtx.decoders.abi_decoder.decode_transfers(abi_decoded_calls, abi_decoded_events)
abi_decoded_balances: List[DecodedBalance] = ethtx.decoders.abi_decoder.decode_balances(abi_decoded_transfers)

# decode a single event
raw_event: Event = transaction.events[3]
abi_decoded_event: DecodedEvent = ethtx.decoders.abi_decoder.decode_event(raw_event, transaction.metadata)

# decode a single call
raw_call: Call = transaction.root_call.subcalls[3].subcalls[2]
abi_decoded_call: DecodedCall = ethtx.decoders.abi_decoder.decode_call(raw_call, transaction.metadata)
  1. Semantic decoding:
from ethtx.models.decoded_model import DecodedTransactionMetadata

# get proxies used in the transaction
proxies = ethtx.decoders.get_proxies(transaction.root_call, chain_id)

# semantically decode transaction components
decoded_metadata: DecodedTransactionMetadata = ethtx.decoders.semantic_decoder.decode_metadata(block.metadata, transaction.metadata, chain_id)
decoded_events: List[DecodedEvent] = ethtx.decoders.semantic_decoder.decode_events(abi_decoded_events, decoded_metadata, proxies)
decoded_calls: Call = ethtx.decoders.semantic_decoder.decode_calls(abi_decoded_calls, decoded_metadata, proxies)
decoded_transfers: List[DecodedTransfer] = ethtx.decoders.semantic_decoder.decode_transfers(abi_decoded_transfers)
decoded_balances: List[DecodedBalance] = ethtx.decoders.semantic_decoder.decode_balances(abi_decoded_balances)

# semantically decode a single event
decoded_event: DecodedEvent = ethtx.decoders.semantic_decoder.decode_event(abi_decoded_events[0], decoded_metadata, proxies)
# semantically decode a single call
decoded_call: Call = ethtx.decoders.semantic_decoder.decode_call(abi_decoded_calls.subcalls[2].subcalls[0], decoded_metadata, proxies)