EIP4337 reference modules

Bundler

A basic eip4337 "bundler"

This is a reference implementation for a bundler, implementing the full EIP-4337 RPC calls (both production and debug calls), required to pass the bundler-spec-tests test suite.

Running local node

In order to implement the full spec storage access rules and opcode banning, it must run against a GETH node, which supports debug_traceCall with javascript "tracer" Specifically, hardhat node and ganache do NOT support this API. You can still run the bundler with such nodes, but with --unsafe so it would skip these security checks

If you don't have geth installed locally, you can use docker to run it:

docker run --rm -ti --name geth -p 8545:8545 ethereum/client-go:v1.13.5 \
  --miner.gaslimit 12000000 \
  --http --http.api personal,eth,net,web3,debug \
  --http.vhosts '*,localhost,host.docker.internal' --http.addr "0.0.0.0" \
  --allow-insecure-unlock --rpc.allow-unprotected-txs \
  --dev \
  --verbosity 2 \
  --nodiscover --maxpeers 0 --mine \
  --networkid 1337

Usage:

1. run yarn && yarn preprocess
2. deploy contracts with yarn hardhat-deploy --network localhost
3. run yarn run bundler (or yarn run bundler --unsafe, if working with "hardhat node")

Now your bundler is active on local url http://localhost:3000/rpc

To run a simple test, do yarn run runop --deployFactory --network http://localhost:8545/ --entryPoint 0x0000000071727De22E5E9d8BAf0edAc6f37da032

The runop script:

• deploys a wallet deployer (if not already there)
• creates a random signer (owner for wallet)
• determines the wallet address, and funds it
• sends a transaction (which also creates the wallet)
• sends another transaction, on this existing wallet
• (uses account[0] or mnemonic file for funding, and creating deployer if needed)

NOTE: if running on a testnet, you need to supply the bundler (and runop) the network and mnemonic file, e.g.

yarn run bundler --network localhost --mnemonic file.txt

To run the full test bundler spec test suite, visit https://github.com/eth-infinitism/bundler-spec-tests

sdk

SDK to create and send UserOperations see SDK Readme

utils

internal utility methods/test contracts, used by other packages.