evm-trace: Ethereum Virtual Machine transaction tracing tool
Project description
Quick Start
Ethereum Virtual Machine transaction tracing tool
Dependencies
- python3 version 3.8 or greater, python3-dev
Installation
via pip
You can install the latest release via pip:
pip install evm-trace
via setuptools
You can clone the repository and use setuptools for the most up-to-date version:
git clone https://github.com/ApeWorX/evm-trace.git
cd evm-trace
python3 setup.py install
Quick Usage
Geth Style Traces
If you are using a node that supports the debug_traceTransaction RPC, you can use web3.py to get trace frames:
from web3 import HTTPProvider, Web3
from evm_trace import TraceFrame
web3 = Web3(HTTPProvider("https://path.to.my.node"))
txn_hash = "0x..."
struct_logs = web3.manager.request_blocking("debug_traceTransaction", [txn_hash]).structLogs
for item in struct_logs:
frame = TraceFrame.parse_obj(item)
If you want to get the call-tree node, you can do:
from evm_trace import CallType, get_calltree_from_geth_trace
root_node_kwargs = {
"gas_cost": 10000000,
"gas_limit": 10000000000,
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"calldata": "0x00",
"value": 1000,
"call_type": CallType.CALL,
}
# Where `trace` is a `TraceFrame` (see example above)
calltree = get_calltree_from_geth_trace(trace, **root_node_kwargs)
Parity Style Traces
If you are using a node that supports the trace_transaction RPC, you can use web3.py to get trace objects:
from evm_trace import CallType, ParityTraceList
raw_trace_list = web3.manager.request_blocking("trace_transaction", [txn_hash])
trace_list = ParityTraceList.parse_obj(raw_trace_list)
And to make call-tree nodes, you can do:
from evm_trace import get_calltree_from_parity_trace
tree = get_calltree_from_parity_trace(trace_list)
Gas Reports
If you are using a node that supports creating traces, you can get a gas report.
from evm_trace.gas import get_gas_report
# see examples above for creating a calltree
calltree = get_calltree_from_geth_trace(trace, **root_node_kwargs)
gas_report = get_gas_report(calltree)
For a more custom report, use the merge_reports method to combine a list of reports into a single report.
Pass two or more Dict[Any, Dict[Any, List[int]]] to combine reports where List[int] is the gas used.
Customize the values of Any accordingly:
- The first
Anyrepresents the bytes from the address. - The second
Anyrepresents the method selector.
For example, you may replace addresses with token names or selector bytes with signature call strings.
Import the method like so:
from evm_trace.gas import merge_reports
Development
This project is in development and should be considered a beta. Things might not be in their final state and breaking changes may occur. Comments, questions, criticisms and pull requests are welcomed.
License
This project is licensed under the Apache 2.0.
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