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// Copyright 2020 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 <http://www.gnu.org/licenses/>.
// Package miner implements Ethereum block creation and mining.
package miner
import (
"errors"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus/clique"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/txpool"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/trie"
)
type mockBackend struct {
bc *core.BlockChain
txPool *txpool.TxPool
}
func NewMockBackend(bc *core.BlockChain, txPool *txpool.TxPool) *mockBackend {
return &mockBackend{
bc: bc,
txPool: txPool,
}
}
func (m *mockBackend) BlockChain() *core.BlockChain {
return m.bc
}
func (m *mockBackend) TxPool() *txpool.TxPool {
return m.txPool
}
func (m *mockBackend) StateAtBlock(block *types.Block, reexec uint64, base *state.StateDB, checkLive bool, preferDisk bool) (statedb *state.StateDB, err error) {
return nil, errors.New("not supported")
}
type testBlockChain struct {
statedb *state.StateDB
gasLimit uint64
chainHeadFeed *event.Feed
}
func (bc *testBlockChain) CurrentBlock() *types.Block {
return types.NewBlock(&types.Header{
GasLimit: bc.gasLimit,
}, nil, nil, nil, trie.NewStackTrie(nil))
}
func (bc *testBlockChain) GetBlock(hash common.Hash, number uint64) *types.Block {
return bc.CurrentBlock()
}
func (bc *testBlockChain) StateAt(common.Hash) (*state.StateDB, error) {
return bc.statedb, nil
}
func (bc *testBlockChain) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
return bc.chainHeadFeed.Subscribe(ch)
}
func TestMiner(t *testing.T) {
miner, mux, cleanup := createMiner(t)
defer cleanup(false)
miner.Start()
waitForMiningState(t, miner, true)
// Start the downloader
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Stop the downloader and wait for the update loop to run
mux.Post(downloader.DoneEvent{})
waitForMiningState(t, miner, true)
// Subsequent downloader events after a successful DoneEvent should not cause the
// miner to start or stop. This prevents a security vulnerability
// that would allow entities to present fake high blocks that would
// stop mining operations by causing a downloader sync
// until it was discovered they were invalid, whereon mining would resume.
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, true)
mux.Post(downloader.FailedEvent{})
waitForMiningState(t, miner, true)
}
// TestMinerDownloaderFirstFails tests that mining is only
// permitted to run indefinitely once the downloader sees a DoneEvent (success).
// An initial FailedEvent should allow mining to stop on a subsequent
// downloader StartEvent.
func TestMinerDownloaderFirstFails(t *testing.T) {
miner, mux, cleanup := createMiner(t)
defer cleanup(false)
miner.Start()
waitForMiningState(t, miner, true)
// Start the downloader
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Stop the downloader and wait for the update loop to run
mux.Post(downloader.FailedEvent{})
waitForMiningState(t, miner, true)
// Since the downloader hasn't yet emitted a successful DoneEvent,
// we expect the miner to stop on next StartEvent.
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Downloader finally succeeds.
mux.Post(downloader.DoneEvent{})
waitForMiningState(t, miner, true)
// Downloader starts again.
// Since it has achieved a DoneEvent once, we expect miner
// state to be unchanged.
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, true)
mux.Post(downloader.FailedEvent{})
waitForMiningState(t, miner, true)
}
func TestMinerStartStopAfterDownloaderEvents(t *testing.T) {
miner, mux, cleanup := createMiner(t)
defer cleanup(false)
miner.Start()
waitForMiningState(t, miner, true)
// Start the downloader
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Downloader finally succeeds.
mux.Post(downloader.DoneEvent{})
waitForMiningState(t, miner, true)
miner.Stop()
waitForMiningState(t, miner, false)
miner.Start()
waitForMiningState(t, miner, true)
miner.Stop()
waitForMiningState(t, miner, false)
}
func TestStartWhileDownload(t *testing.T) {
miner, mux, cleanup := createMiner(t)
defer cleanup(false)
waitForMiningState(t, miner, false)
miner.Start()
waitForMiningState(t, miner, true)
// Stop the downloader and wait for the update loop to run
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Starting the miner after the downloader should not work
miner.Start()
waitForMiningState(t, miner, false)
}
func TestStartStopMiner(t *testing.T) {
miner, _, cleanup := createMiner(t)
defer cleanup(false)
waitForMiningState(t, miner, false)
miner.Start()
waitForMiningState(t, miner, true)
miner.Stop()
waitForMiningState(t, miner, false)
}
func TestCloseMiner(t *testing.T) {
miner, _, cleanup := createMiner(t)
defer cleanup(true)
waitForMiningState(t, miner, false)
miner.Start()
waitForMiningState(t, miner, true)
// Terminate the miner and wait for the update loop to run
miner.Close()
waitForMiningState(t, miner, false)
}
// TestMinerSetEtherbase checks that etherbase becomes set even if mining isn't
// possible at the moment
func TestMinerSetEtherbase(t *testing.T) {
miner, mux, cleanup := createMiner(t)
defer cleanup(false)
miner.Start()
waitForMiningState(t, miner, true)
// Start the downloader
mux.Post(downloader.StartEvent{})
waitForMiningState(t, miner, false)
// Now user tries to configure proper mining address
miner.Start()
// Stop the downloader and wait for the update loop to run
mux.Post(downloader.DoneEvent{})
waitForMiningState(t, miner, true)
coinbase := common.HexToAddress("0xdeedbeef")
miner.SetEtherbase(coinbase)
if addr := miner.worker.etherbase(); addr != coinbase {
t.Fatalf("Unexpected etherbase want %x got %x", coinbase, addr)
}
}
// waitForMiningState waits until either
// * the desired mining state was reached
// * a timeout was reached which fails the test
func waitForMiningState(t *testing.T, m *Miner, mining bool) {
t.Helper()
var state bool
for i := 0; i < 100; i++ {
time.Sleep(10 * time.Millisecond)
if state = m.Mining(); state == mining {
return
}
}
t.Fatalf("Mining() == %t, want %t", state, mining)
}
func createMiner(t *testing.T) (*Miner, *event.TypeMux, func(skipMiner bool)) {
// Create Ethash config
config := Config{
Etherbase: common.HexToAddress("123456789"),
}
// Create chainConfig
chainDB := rawdb.NewMemoryDatabase()
genesis := core.DeveloperGenesisBlock(15, 11_500_000, common.HexToAddress("12345"))
chainConfig, _, err := core.SetupGenesisBlock(chainDB, trie.NewDatabase(chainDB), genesis)
if err != nil {
t.Fatalf("can't create new chain config: %v", err)
}
// Create consensus engine
engine := clique.New(chainConfig.Clique, chainDB)
// Create Ethereum backend
bc, err := core.NewBlockChain(chainDB, nil, genesis, nil, engine, vm.Config{}, nil, nil)
if err != nil {
t.Fatalf("can't create new chain %v", err)
}
statedb, _ := state.New(common.Hash{}, state.NewDatabase(chainDB), nil)
blockchain := &testBlockChain{statedb, 10000000, new(event.Feed)}
pool := txpool.NewTxPool(testTxPoolConfig, chainConfig, blockchain)
backend := NewMockBackend(bc, pool)
// Create event Mux
mux := new(event.TypeMux)
// Create Miner
miner := New(backend, &config, chainConfig, mux, engine, nil)
cleanup := func(skipMiner bool) {
bc.Stop()
engine.Close()
pool.Stop()
if !skipMiner {
miner.Close()
}
}
return miner, mux, cleanup
}