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fork.yaml
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title: "op-geth - go-ethereum fork diff overview"
footer: |
Fork-diff overview of [`op-geth`](https://github.com/ethereum-optimism/op-geth), a fork of [`go-ethereum`](https://github.com/ethereum/go-ethereum).
and execution-engine of the [OP-stack](https://github.com/ethereum-optimism/optimism).
base:
name: go-ethereum
url: https://github.com/ethereum/go-ethereum
hash: a9523b6428238a762e1a1e55e46ead47630c3a23 # v1.14.8
fork:
name: op-geth
url: https://github.com/ethereum-optimism/op-geth
ref: refs/heads/optimism
def:
title: "op-geth"
description: |
This is an overview of the changes in [`op-geth`](https://github.com/ethereum-optimism/op-geth),
a fork of [`go-ethereum`](https://github.com/ethereum/go-ethereum), part of the OP-stack.
The OP-stack architecture is modular, following the Consensus/Execution split of post-Merge Ethereum L1:
- [`op-node`](https://github.com/ethereum-optimism/optimism/tree/develop/op-node) implements most rollup-specific functionality as Consensus-Layer, similar to a L1 beacon-node.
- [`op-geth`](https://github.com/ethereum-optimism/op-geth) implements the Execution-Layer, with **minimal changes** for a secure Ethereum-equivalent application environment.
Related [op-stack specifications](https://github.com/ethereum-optimism/optimism/tree/develop/specs):
- [L2 Execution Engine spec](https://github.com/ethereum-optimism/optimism/blob/develop/specs/exec-engine.md)
- [Deposit Transaction spec](https://github.com/ethereum-optimism/optimism/blob/develop/specs/deposits.md)
sub:
- title: "Core modifications"
sub:
- title: "State-transition modifications"
description: ""
sub:
- title: "Deposit Transaction type"
description: |
The Bedrock upgrade introduces a `Deposit` transaction-type (`0x7E`) to enable both users and the
rollup system itself to change the L2 state based on L1 events and system rules as
[specified](https://github.com/ethereum-optimism/optimism/blob/develop/specs/deposits.md).
globs:
- "core/types/deposit_tx.go"
- "core/types/transaction_marshalling.go"
- "core/types/transaction_signing.go"
- title: "Transaction properties"
description: |
The `Transaction` type now exposes the deposit-transaction and L1-cost properties required for the rollup.
globs:
- "core/types/transaction.go"
- "core/types/tx_access_list.go"
- "core/types/tx_dynamic_fee.go"
- "core/types/tx_legacy.go"
- "core/types/tx_blob.go"
- title: "EVM enhancements"
description: |
Apply L1 cost computation, and add EVM configuration for tooling and more:
- Disable bytecode size-limits (for large test/script contracts).
- Prank (solidity test terminology) the EVM-call message-sender.
- Override precompiles, to insert tooling precompiles and optimize precompile proving.
globs:
- "core/vm/evm.go"
- "core/vm/interpreter.go"
- "core/vm/gas_table.go"
- title: "L1 cost computation"
description: |
Transactions must pay an additional L1 cost based on the amount of rollup-data-gas they consume,
estimated based on gas-price-oracle information and encoded tx size."
globs:
- "core/evm.go"
- "core/types/rollup_cost.go"
- "core/state_processor.go"
- "core/state_prefetcher.go"
- title: Transaction processing
description: |
Deposit transactions have special processing rules: gas is pre-paid on L1,
and deposits with EVM-failure are included with rolled back changes (except mint).
For regular transactions, at the end of the transition, the 1559 burn and L1 cost are routed to vaults.
globs:
- "core/state_transition.go"
- title: "Core Error definitions"
globs:
- "core/error.go"
- title: "Gaslimit"
description: |
The gaslimit is free to be set by the Engine API caller, instead of enforcing adjustments of the
gaslimit in increments of 1/1024 of the previous gaslimit.
The gaslimit is changed (and limited) through the `SystemConfig` contract.
globs:
- "consensus/misc/eip1559/eip1559.go"
- title: "Consensus tweaks"
description: |
The Engine API is activated at the Merge transition, with a Total Terminal Difficulty (TTD).
The rollup starts post-merge, and thus sets the TTD to 0.
The TTD is always "reached" starting at the bedrock block.
globs:
- "consensus/beacon/consensus.go"
- title: "Legacy OP-mainnet / OP-goerli header-verification support"
description: |
Pre-Bedrock OP-mainnet and OP-Goerli had differently formatted block-headers, loosely compatible with the geth types (since it was based on Clique).
However, due to differences like the extra-data length (97+ bytes), these legacy block-headers need special verification.
The pre-merge "consensus" fallback is set to this custom but basic verifier, to accept these headers when syncing a pre-bedrock part of the chain,
independent of any clique code or configuration (which may be removed from geth at a later point).
All the custom verifier has to do is accept the headers, as the headers are already verified by block-hash through the reverse-header-sync.
globs:
- "consensus/beacon/oplegacy.go"
- title: "Engine API modifications"
description: |
The Engine API is extended to insert transactions into the block and optionally exclude the tx-pool,
to reproduce the exact block of the sequencer from just the inputs, as derived from L1 by the rollup-node.
See [L2 execution engine specs](https://github.com/ethereum-optimism/optimism/blob/develop/specs/exec-engine.md).
globs:
- "beacon/engine/types.go"
- "beacon/engine/gen_blockparams.go"
- "eth/catalyst/api.go"
- title: "Block-building modifications"
description: |
The block-building code (in the "miner" package because of Proof-Of-Work legacy of ethereum) implements the
changes to support the transaction-inclusion, tx-pool toggle and gaslimit parameters of the Engine API.
globs:
- "miner/*"
- title: "Tx-pool tx cost updates"
description: |
Transaction queueing and inclusion needs to account for the L1 cost component.
globs:
- "core/txpool/**/*"
- "core/txpool/legacypool/*"
- title: "RIP-7212"
description: ""
globs:
- "core/vm/contracts.go"
- "crypto/secp256r1/publickey.go"
- "crypto/secp256r1/verifier.go"
- title: "Chain Configuration"
sub:
- title: "Chain config"
description: |
The rollup functionality is enabled with the `optimism` field in the chain config.
The EIP-1559 parameters are configurable to adjust for faster more frequent and smaller blocks.
The parameters can be overriden for testing.
globs:
- "params/config.go"
- "params/protocol_params.go"
- "core/genesis.go"
- title: "Chain config cleanup"
description: |
The optimism Goerli testnet used clique-config data to make geth internals accept blocks.
Post-bedrock the beacon-consensus (i.e. follow Engine API) is now used, and the clique config is removed.
globs:
- "core/rawdb/accessors_metadata.go"
- title: Genesis loading
globs:
- "core/gen_genesis.go"
- title: "Superchain config"
description: Testing of the superchain configuration
globs:
- "core/superchain.go"
- "params/superchain.go"
- title: "Node modifications"
description: Changes to the node configuration and services.
sub:
- title: "CLI"
sub:
- title: "Flags"
description: |
Flag changes:
- Transactions can be forwarded to an RPC for sequencing.
- Historical calls can be forwarded to a legacy node.
- The tx pool propagation can be enabled/disabled.
- The Optimism bedrock fork activation can be changed for testing.
globs:
- "cmd/utils/flags.go"
- "cmd/geth/main.go"
- "internal/flags/categories.go"
- "cmd/geth/config.go"
- title: "Versioning"
description: List the op-geth and upstream go-ethereum versions.
globs:
- "cmd/geth/misccmd.go"
- "params/version.go"
- "build/ci.go"
- title: Node config
globs:
- "eth/ethconfig/config.go"
- title: Tx gossip disable option
globs:
- "eth/handler.go"
- "eth/handler_eth.go"
- title: Warn on missing hardfork data
globs:
- "core/blockchain.go"
- title: Optional Engine API extensions
globs:
- "eth/catalyst/superchain.go"
- title: Support legacy DBs when snap-syncing
description: Snap-sync does not serve unprefixed code by default.
globs:
- "core/blockchain_reader.go"
- "eth/protocols/snap/handler.go"
- title: Historical data for Snap-sync
description: Snap-sync has access to trusted Deposit Transaction Nonce Data.
globs:
- "eth/downloader/downloader.go"
- "eth/downloader/receiptreference.go"
- title: Discv5 node discovery
description: Fix discv5 option to allow discv5 to be an active source for node-discovery.
globs:
- "p2p/server.go"
- title: Bootnodes
description: Discovery bootnode addresses.
globs:
- "params/bootnodes.go"
- title: Generated TOML config update
globs:
- "eth/ethconfig/gen_config.go"
- title: "TrieDB PathDB-journal migration"
description: |
From version 1.13.15 to 1.14.0 upstream go-ethereum changed the PathDB journal version, without migration path.
For a better experience when updating op-geth, to not roll back any journaled stage changes,
op-geth implements backward-compatibility with the old journal version.
See upstream Geth PR 28940, and op-geth PR 368 for details.
globs:
- "triedb/pathdb/journal.go"
- title: "Single threaded execution"
description: |
The cannon fault proofs virtual machine does not support the creation of threads. To ensure compatibility,
thread creation is avoided when only a single CPU is available.
globs:
- "core/state/workers.go"
- "trie/hasher.go"
- title: "User API enhancements"
description: "Encode the Deposit Tx properties, the L1 costs, and daisy-chain RPC-calls for pre-Bedrock historical data"
sub:
- title: "Receipts metadata"
description: |
Pre-Bedrock L1-cost receipt data is loaded from the database if available, and post-Bedrock the L1-cost
metadata is hydrated on-the-fly based on the L1 fee information in the corresponding block.
globs:
- "core/types/receipt.go"
- "core/types/gen_receipt_json.go"
- "core/rawdb/accessors_chain.go"
- title: "API Backend"
description: |
Forward transactions to the sequencer if configured.
globs:
- "eth/api_backend.go"
- "eth/backend.go"
- "internal/ethapi/backend.go"
- title: "Apply L1 cost in API responses"
globs:
- "eth/state_accessor.go"
- title: API frontend
description: Format deposit and L1-cost data in transaction responses. Add `debug_chainConfig` API.
globs:
- "internal/ethapi/api.go"
- "rpc/errors.go"
- title: Tracer RPC daisy-chain
description: Forward pre-bedrock tracing calls to legacy node.
globs:
- "eth/tracers/api.go"
- title: "Daisy Chain tests"
ignore:
- "internal/ethapi/transaction_args_test.go"
- "ethclient/ethclient_test.go"
- "eth/tracers/api_test.go"
- title: Debug API
description: Fix Debug API block marshaling to include deposits
globs:
- "eth/api_debug.go"
- title: Eth gasprice suggestions
description: gasprice suggestion adjustments to accommodate faster L2 blocks and lower fees.
globs:
- "eth/gasprice/gasprice.go"
- "eth/gasprice/optimism-gasprice.go"
- title: API testvector fix
description: |
Upstream test of broken behavior; in Optimism, a zero signature is valid (pre-bedrock for deposit-txs),
and the chain ID formula on signature data must not be used, or an underflow happens.
globs:
- "internal/ethapi/testdata/eth_getBlockByNumber-tag-pending-fullTx.json"
- title: "Geth extras"
description: Extend the tools available in geth to improve external testing and tooling.
sub:
- title: Simulated Backend
globs:
- "accounts/abi/bind/backends/simulated.go"
- "ethclient/simulated/backend.go"
- title: Live tracer update
description: |
Track L1-deposited native currency that is coming into the L2 supply.
The balance delta is considered to be a "withdrawal" from L1,
similar to a withdrawal of the Beacon-chain into the Ethereum L1 execution chain.
globs:
- "eth/tracers/live/supply.go"
- title: "Hardware wallet support"
description: Extend Ledger wallet support for newer devices on Macos
sub:
- title: Fix Ledger discoverability
# upstream PR: https://github.com/ethereum/go-ethereum/pull/28863/
globs:
- "accounts/usbwallet/hub.go"
- title: "Testing"
description: Additional or modified tests, not already captured by the above diff
ignore:
- "**/*_test.go"
# ignored globally, does not count towards line count
ignore:
- ".circleci/*"
- "*.sum"
- "go.mod"
- "fork.yaml"
- "Makefile"
- ".golangci.yml"
- ".github/**"
- "**/*.gob" # data asset, not code
- "core/vm/testdata/precompiles/p256Verify.json" # data asset, not code
- "eth/tracers/internal/tracetest/testdata/**/*.json"