From 065f82a8cc30ac88b4e1516741051da51224475f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= Date: Fri, 12 Jan 2024 15:58:49 +0200 Subject: [PATCH] accounts, ethclient: minor tweaks on the new simulated backend (#28799) * accounts, ethclient: minor tweaks on the new simulated backend * ethclient/simulated: add an initial batch of gas options * accounts, ethclient: remove mandatory gasLimit constructor param * accounts, ethclient: minor option naming tweaks --- accounts/abi/bind/backends/simulated.go | 2 +- accounts/abi/bind/util_test.go | 6 +- ethclient/simulated/backend.go | 79 ++++++++++++------------- ethclient/simulated/backend_test.go | 10 ++-- ethclient/simulated/options.go | 39 ++++++++++++ ethclient/simulated/options_test.go | 73 +++++++++++++++++++++++ 6 files changed, 158 insertions(+), 51 deletions(-) create mode 100644 ethclient/simulated/options.go create mode 100644 ethclient/simulated/options_test.go diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go index 927156669..756a9d355 100644 --- a/accounts/abi/bind/backends/simulated.go +++ b/accounts/abi/bind/backends/simulated.go @@ -44,7 +44,7 @@ func (b *SimulatedBackend) Fork(ctx context.Context, parentHash common.Hash) err // Deprecated: please use simulated.Backend from package // github.com/ethereum/go-ethereum/ethclient/simulated instead. func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend { - b := simulated.New(alloc, gasLimit) + b := simulated.NewBackend(alloc, simulated.WithBlockGasLimit(gasLimit)) return &SimulatedBackend{ Backend: b, Client: b.Client(), diff --git a/accounts/abi/bind/util_test.go b/accounts/abi/bind/util_test.go index 244eeebdd..9fd919a29 100644 --- a/accounts/abi/bind/util_test.go +++ b/accounts/abi/bind/util_test.go @@ -56,11 +56,10 @@ var waitDeployedTests = map[string]struct { func TestWaitDeployed(t *testing.T) { t.Parallel() for name, test := range waitDeployedTests { - backend := simulated.New( + backend := simulated.NewBackend( core.GenesisAlloc{ crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000000000)}, }, - 10000000, ) defer backend.Close() @@ -102,11 +101,10 @@ func TestWaitDeployed(t *testing.T) { } func TestWaitDeployedCornerCases(t *testing.T) { - backend := simulated.New( + backend := simulated.NewBackend( core.GenesisAlloc{ crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000000000)}, }, - 10000000, ) defer backend.Close() diff --git a/ethclient/simulated/backend.go b/ethclient/simulated/backend.go index 54675b6dd..6169dde61 100644 --- a/ethclient/simulated/backend.go +++ b/ethclient/simulated/backend.go @@ -34,20 +34,6 @@ import ( "github.com/ethereum/go-ethereum/rpc" ) -// Backend is a simulated blockchain. You can use it to test your contracts or -// other code that interacts with the Ethereum chain. -type Backend struct { - eth *eth.Ethereum - beacon *catalyst.SimulatedBeacon - client simClient -} - -// simClient wraps ethclient. This exists to prevent extracting ethclient.Client -// from the Client interface returned by Backend. -type simClient struct { - *ethclient.Client -} - // Client exposes the methods provided by the Ethereum RPC client. type Client interface { ethereum.BlockNumberReader @@ -66,70 +52,81 @@ type Client interface { ethereum.ChainIDReader } -// New creates a new binding backend using a simulated blockchain -// for testing purposes. +// simClient wraps ethclient. This exists to prevent extracting ethclient.Client +// from the Client interface returned by Backend. +type simClient struct { + *ethclient.Client +} + +// Backend is a simulated blockchain. You can use it to test your contracts or +// other code that interacts with the Ethereum chain. +type Backend struct { + eth *eth.Ethereum + beacon *catalyst.SimulatedBeacon + client simClient +} + +// NewBackend creates a new simulated blockchain that can be used as a backend for +// contract bindings in unit tests. +// // A simulated backend always uses chainID 1337. -func New(alloc core.GenesisAlloc, gasLimit uint64) *Backend { - // Setup the node object +func NewBackend(alloc core.GenesisAlloc, options ...func(nodeConf *node.Config, ethConf *ethconfig.Config)) *Backend { + // Create the default configurations for the outer node shell and the Ethereum + // service to mutate with the options afterwards nodeConf := node.DefaultConfig nodeConf.DataDir = "" nodeConf.P2P = p2p.Config{NoDiscovery: true} - stack, err := node.New(&nodeConf) - if err != nil { - // This should never happen, if it does, please open an issue - panic(err) - } - // Setup ethereum - genesis := core.Genesis{ + ethConf := ethconfig.Defaults + ethConf.Genesis = &core.Genesis{ Config: params.AllDevChainProtocolChanges, - GasLimit: gasLimit, + GasLimit: ethconfig.Defaults.Miner.GasCeil, Alloc: alloc, } - conf := ethconfig.Defaults - conf.Genesis = &genesis - conf.SyncMode = downloader.FullSync - conf.TxPool.NoLocals = true - sim, err := newWithNode(stack, &conf, 0) + ethConf.SyncMode = downloader.FullSync + ethConf.TxPool.NoLocals = true + + for _, option := range options { + option(&nodeConf, ðConf) + } + // Assemble the Ethereum stack to run the chain with + stack, err := node.New(&nodeConf) if err != nil { - // This should never happen, if it does, please open an issue - panic(err) + panic(err) // this should never happen + } + sim, err := newWithNode(stack, ðConf, 0) + if err != nil { + panic(err) // this should never happen } return sim } -// newWithNode sets up a simulated backend on an existing node -// this allows users to do persistent simulations. -// The provided node must not be started and will be started by newWithNode +// newWithNode sets up a simulated backend on an existing node. The provided node +// must not be started and will be started by this method. func newWithNode(stack *node.Node, conf *eth.Config, blockPeriod uint64) (*Backend, error) { backend, err := eth.New(stack, conf) if err != nil { return nil, err } - // Register the filter system filterSystem := filters.NewFilterSystem(backend.APIBackend, filters.Config{}) stack.RegisterAPIs([]rpc.API{{ Namespace: "eth", Service: filters.NewFilterAPI(filterSystem, false), }}) - // Start the node if err := stack.Start(); err != nil { return nil, err } - // Set up the simulated beacon beacon, err := catalyst.NewSimulatedBeacon(blockPeriod, backend) if err != nil { return nil, err } - // Reorg our chain back to genesis if err := beacon.Fork(backend.BlockChain().GetCanonicalHash(0)); err != nil { return nil, err } - return &Backend{ eth: backend, beacon: beacon, diff --git a/ethclient/simulated/backend_test.go b/ethclient/simulated/backend_test.go index 16a2acdf4..a9a8accfe 100644 --- a/ethclient/simulated/backend_test.go +++ b/ethclient/simulated/backend_test.go @@ -40,10 +40,10 @@ var ( ) func simTestBackend(testAddr common.Address) *Backend { - return New( + return NewBackend( core.GenesisAlloc{ testAddr: {Balance: big.NewInt(10000000000000000)}, - }, 10000000, + }, ) } @@ -70,8 +70,8 @@ func newTx(sim *Backend, key *ecdsa.PrivateKey) (*types.Transaction, error) { return types.SignTx(tx, types.LatestSignerForChainID(chainid), key) } -func TestNewSim(t *testing.T) { - sim := New(core.GenesisAlloc{}, 30_000_000) +func TestNewBackend(t *testing.T) { + sim := NewBackend(core.GenesisAlloc{}) defer sim.Close() client := sim.Client() @@ -94,7 +94,7 @@ func TestNewSim(t *testing.T) { } func TestAdjustTime(t *testing.T) { - sim := New(core.GenesisAlloc{}, 10_000_000) + sim := NewBackend(core.GenesisAlloc{}) defer sim.Close() client := sim.Client() diff --git a/ethclient/simulated/options.go b/ethclient/simulated/options.go new file mode 100644 index 000000000..1b2f4c090 --- /dev/null +++ b/ethclient/simulated/options.go @@ -0,0 +1,39 @@ +// Copyright 2024 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see . + +package simulated + +import ( + "github.com/ethereum/go-ethereum/eth/ethconfig" + "github.com/ethereum/go-ethereum/node" +) + +// WithBlockGasLimit configures the simulated backend to target a specific gas limit +// when producing blocks. +func WithBlockGasLimit(gaslimit uint64) func(nodeConf *node.Config, ethConf *ethconfig.Config) { + return func(nodeConf *node.Config, ethConf *ethconfig.Config) { + ethConf.Genesis.GasLimit = gaslimit + ethConf.Miner.GasCeil = gaslimit + } +} + +// WithCallGasLimit configures the simulated backend to cap eth_calls to a specific +// gas limit when running client operations. +func WithCallGasLimit(gaslimit uint64) func(nodeConf *node.Config, ethConf *ethconfig.Config) { + return func(nodeConf *node.Config, ethConf *ethconfig.Config) { + ethConf.RPCGasCap = gaslimit + } +} diff --git a/ethclient/simulated/options_test.go b/ethclient/simulated/options_test.go new file mode 100644 index 000000000..d9ff3b428 --- /dev/null +++ b/ethclient/simulated/options_test.go @@ -0,0 +1,73 @@ +// Copyright 2024 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see . + +package simulated + +import ( + "context" + "math/big" + "strings" + "testing" + + "github.com/ethereum/go-ethereum" + "github.com/ethereum/go-ethereum/core" + "github.com/ethereum/go-ethereum/params" +) + +// Tests that the simulator starts with the initial gas limit in the genesis block, +// and that it keeps the same target value. +func TestWithBlockGasLimitOption(t *testing.T) { + // Construct a simulator, targeting a different gas limit + sim := NewBackend(core.GenesisAlloc{}, WithBlockGasLimit(12_345_678)) + defer sim.Close() + + client := sim.Client() + genesis, err := client.BlockByNumber(context.Background(), big.NewInt(0)) + if err != nil { + t.Fatalf("failed to retrieve genesis block: %v", err) + } + if genesis.GasLimit() != 12_345_678 { + t.Errorf("genesis gas limit mismatch: have %v, want %v", genesis.GasLimit(), 12_345_678) + } + // Produce a number of blocks and verify the locked in gas target + sim.Commit() + head, err := client.BlockByNumber(context.Background(), big.NewInt(1)) + if err != nil { + t.Fatalf("failed to retrieve head block: %v", err) + } + if head.GasLimit() != 12_345_678 { + t.Errorf("head gas limit mismatch: have %v, want %v", head.GasLimit(), 12_345_678) + } +} + +// Tests that the simulator honors the RPC call caps set by the options. +func TestWithCallGasLimitOption(t *testing.T) { + // Construct a simulator, targeting a different gas limit + sim := NewBackend(core.GenesisAlloc{ + testAddr: {Balance: big.NewInt(10000000000000000)}, + }, WithCallGasLimit(params.TxGas-1)) + defer sim.Close() + + client := sim.Client() + _, err := client.CallContract(context.Background(), ethereum.CallMsg{ + From: testAddr, + To: &testAddr, + Gas: 21000, + }, nil) + if !strings.Contains(err.Error(), core.ErrIntrinsicGas.Error()) { + t.Fatalf("error mismatch: have %v, want %v", err, core.ErrIntrinsicGas) + } +}