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Merge pull request #17492 from karalabe/eth-miner-threads-defaults

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cmd, eth: clean up miner startup API, drop noop config field
This commit is contained in:
Péter Szilágyi 2018-08-23 14:17:12 +03:00 committed by GitHub
commit 67d6d0bb7d
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 489 additions and 80 deletions
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20
cmd/geth/main.go
View File

@ -336,26 +336,18 @@ func startNode(ctx *cli.Context, stack *node.Node) {
if err := stack.Service(&ethereum); err != nil {
utils.Fatalf("Ethereum service not running: %v", err)
}
// Use a reduced number of threads if requested
threads := ctx.GlobalInt(utils.MinerLegacyThreadsFlag.Name)
if ctx.GlobalIsSet(utils.MinerThreadsFlag.Name) {
threads = ctx.GlobalInt(utils.MinerThreadsFlag.Name)
}
if threads > 0 {
type threaded interface {
SetThreads(threads int)
}
if th, ok := ethereum.Engine().(threaded); ok {
th.SetThreads(threads)
}
}
// Set the gas price to the limits from the CLI and start mining
gasprice := utils.GlobalBig(ctx, utils.MinerLegacyGasPriceFlag.Name)
if ctx.IsSet(utils.MinerGasPriceFlag.Name) {
gasprice = utils.GlobalBig(ctx, utils.MinerGasPriceFlag.Name)
}
ethereum.TxPool().SetGasPrice(gasprice)
if err := ethereum.StartMining(true); err != nil {
threads := ctx.GlobalInt(utils.MinerLegacyThreadsFlag.Name)
if ctx.GlobalIsSet(utils.MinerThreadsFlag.Name) {
threads = ctx.GlobalInt(utils.MinerThreadsFlag.Name)
}
if err := ethereum.StartMining(threads); err != nil {
utils.Fatalf("Failed to start mining: %v", err)
}
}

6
cmd/utils/flags.go
View File

@ -1130,12 +1130,6 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
if ctx.GlobalIsSet(CacheFlag.Name) || ctx.GlobalIsSet(CacheGCFlag.Name) {
cfg.TrieCache = ctx.GlobalInt(CacheFlag.Name) * ctx.GlobalInt(CacheGCFlag.Name) / 100
}
if ctx.GlobalIsSet(MinerLegacyThreadsFlag.Name) {
cfg.MinerThreads = ctx.GlobalInt(MinerLegacyThreadsFlag.Name)
}
if ctx.GlobalIsSet(MinerThreadsFlag.Name) {
cfg.MinerThreads = ctx.GlobalInt(MinerThreadsFlag.Name)
}
if ctx.GlobalIsSet(MinerNotifyFlag.Name) {
cfg.MinerNotify = strings.Split(ctx.GlobalString(MinerNotifyFlag.Name), ",")
}

47
eth/api.go
View File

@ -24,6 +24,7 @@ import (
"io"
"math/big"
"os"
"runtime"
"strings"
"time"
@ -34,7 +35,6 @@ import (
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
@ -94,47 +94,22 @@ func NewPrivateMinerAPI(e *Ethereum) *PrivateMinerAPI {
return &PrivateMinerAPI{e: e}
}
// Start the miner with the given number of threads. If threads is nil the number
// of workers started is equal to the number of logical CPUs that are usable by
// this process. If mining is already running, this method adjust the number of
// threads allowed to use and updates the minimum price required by the transaction
// pool.
// Start starts the miner with the given number of threads. If threads is nil,
// the number of workers started is equal to the number of logical CPUs that are
// usable by this process. If mining is already running, this method adjust the
// number of threads allowed to use and updates the minimum price required by the
// transaction pool.
func (api *PrivateMinerAPI) Start(threads *int) error {
// Set the number of threads if the seal engine supports it
if threads == nil {
threads = new(int)
} else if *threads == 0 {
*threads = -1 // Disable the miner from within
return api.e.StartMining(runtime.NumCPU())
}
type threaded interface {
SetThreads(threads int)
}
if th, ok := api.e.engine.(threaded); ok {
log.Info("Updated mining threads", "threads", *threads)
th.SetThreads(*threads)
}
// Start the miner and return
if !api.e.IsMining() {
// Propagate the initial price point to the transaction pool
api.e.lock.RLock()
price := api.e.gasPrice
api.e.lock.RUnlock()
api.e.txPool.SetGasPrice(price)
return api.e.StartMining(true)
}
return nil
return api.e.StartMining(*threads)
}
// Stop the miner
func (api *PrivateMinerAPI) Stop() bool {
type threaded interface {
SetThreads(threads int)
}
if th, ok := api.e.engine.(threaded); ok {
th.SetThreads(-1)
}
// Stop terminates the miner, both at the consensus engine level as well as at
// the block creation level.
func (api *PrivateMinerAPI) Stop() {
api.e.StopMining()
return true
}
// SetExtra sets the extra data string that is included when this miner mines a block.

76
eth/backend.go
View File

@ -102,12 +102,18 @@ func (s *Ethereum) AddLesServer(ls LesServer) {
// New creates a new Ethereum object (including the
// initialisation of the common Ethereum object)
func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
// Ensure configuration values are compatible and sane
if config.SyncMode == downloader.LightSync {
return nil, errors.New("can't run eth.Ethereum in light sync mode, use les.LightEthereum")
}
if !config.SyncMode.IsValid() {
return nil, fmt.Errorf("invalid sync mode %d", config.SyncMode)
}
if config.MinerGasPrice == nil || config.MinerGasPrice.Cmp(common.Big0) <= 0 {
log.Warn("Sanitizing invalid miner gas price", "provided", config.MinerGasPrice, "updated", DefaultConfig.MinerGasPrice)
config.MinerGasPrice = new(big.Int).Set(DefaultConfig.MinerGasPrice)
}
// Assemble the Ethereum object
chainDb, err := CreateDB(ctx, config, "chaindata")
if err != nil {
return nil, err
@ -333,32 +339,66 @@ func (s *Ethereum) SetEtherbase(etherbase common.Address) {
s.miner.SetEtherbase(etherbase)
}
func (s *Ethereum) StartMining(local bool) error {
eb, err := s.Etherbase()
if err != nil {
log.Error("Cannot start mining without etherbase", "err", err)
return fmt.Errorf("etherbase missing: %v", err)
// StartMining starts the miner with the given number of CPU threads. If mining
// is already running, this method adjust the number of threads allowed to use
// and updates the minimum price required by the transaction pool.
func (s *Ethereum) StartMining(threads int) error {
// Update the thread count within the consensus engine
type threaded interface {
SetThreads(threads int)
}
if clique, ok := s.engine.(*clique.Clique); ok {
wallet, err := s.accountManager.Find(accounts.Account{Address: eb})
if wallet == nil || err != nil {
log.Error("Etherbase account unavailable locally", "err", err)
return fmt.Errorf("signer missing: %v", err)
if th, ok := s.engine.(threaded); ok {
log.Info("Updated mining threads", "threads", threads)
if threads == 0 {
threads = -1 // Disable the miner from within
}
clique.Authorize(eb, wallet.SignHash)
th.SetThreads(threads)
}
if local {
// If local (CPU) mining is started, we can disable the transaction rejection
// mechanism introduced to speed sync times. CPU mining on mainnet is ludicrous
// so none will ever hit this path, whereas marking sync done on CPU mining
// will ensure that private networks work in single miner mode too.
// If the miner was not running, initialize it
if !s.IsMining() {
// Propagate the initial price point to the transaction pool
s.lock.RLock()
price := s.gasPrice
s.lock.RUnlock()
s.txPool.SetGasPrice(price)
// Configure the local mining addess
eb, err := s.Etherbase()
if err != nil {
log.Error("Cannot start mining without etherbase", "err", err)
return fmt.Errorf("etherbase missing: %v", err)
}
if clique, ok := s.engine.(*clique.Clique); ok {
wallet, err := s.accountManager.Find(accounts.Account{Address: eb})
if wallet == nil || err != nil {
log.Error("Etherbase account unavailable locally", "err", err)
return fmt.Errorf("signer missing: %v", err)
}
clique.Authorize(eb, wallet.SignHash)
}
// If mining is started, we can disable the transaction rejection mechanism
// introduced to speed sync times.
atomic.StoreUint32(&s.protocolManager.acceptTxs, 1)
go s.miner.Start(eb)
}
go s.miner.Start(eb)
return nil
}
func (s *Ethereum) StopMining() { s.miner.Stop() }
// StopMining terminates the miner, both at the consensus engine level as well as
// at the block creation level.
func (s *Ethereum) StopMining() {
// Update the thread count within the consensus engine
type threaded interface {
SetThreads(threads int)
}
if th, ok := s.engine.(threaded); ok {
th.SetThreads(-1)
}
// Stop the block creating itself
s.miner.Stop()
}
func (s *Ethereum) IsMining() bool { return s.miner.Mining() }
func (s *Ethereum) Miner() *miner.Miner { return s.miner }

1
eth/config.go
View File

@ -97,7 +97,6 @@ type Config struct {
// Mining-related options
Etherbase common.Address `toml:",omitempty"`
MinerThreads int `toml:",omitempty"`
MinerNotify []string `toml:",omitempty"`
MinerExtraData []byte `toml:",omitempty"`
MinerGasPrice *big.Int

5
eth/gen_config.go
View File

@ -31,7 +31,6 @@ func (c Config) MarshalTOML() (interface{}, error) {
TrieCache int
TrieTimeout time.Duration
Etherbase common.Address `toml:",omitempty"`
MinerThreads int `toml:",omitempty"`
MinerNotify []string `toml:",omitempty"`
MinerExtraData hexutil.Bytes `toml:",omitempty"`
MinerGasPrice *big.Int
@ -55,7 +54,6 @@ func (c Config) MarshalTOML() (interface{}, error) {
enc.TrieCache = c.TrieCache
enc.TrieTimeout = c.TrieTimeout
enc.Etherbase = c.Etherbase
enc.MinerThreads = c.MinerThreads
enc.MinerNotify = c.MinerNotify
enc.MinerExtraData = c.MinerExtraData
enc.MinerGasPrice = c.MinerGasPrice
@ -134,9 +132,6 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
if dec.Etherbase != nil {
c.Etherbase = *dec.Etherbase
}
if dec.MinerThreads != nil {
c.MinerThreads = *dec.MinerThreads
}
if dec.MinerNotify != nil {
c.MinerNotify = dec.MinerNotify
}

217
miner/stress_clique.go Normal file
View File

@ -0,0 +1,217 @@
// Copyright 2018 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/>.
// +build none
// This file contains a miner stress test based on the Clique consensus engine.
package main
import (
"bytes"
"crypto/ecdsa"
"fmt"
"io/ioutil"
"math/big"
"math/rand"
"os"
"time"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/fdlimit"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/params"
)
func main() {
log.Root().SetHandler(log.LvlFilterHandler(log.LvlInfo, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
fdlimit.Raise(2048)
// Generate a batch of accounts to seal and fund with
faucets := make([]*ecdsa.PrivateKey, 128)
for i := 0; i < len(faucets); i++ {
faucets[i], _ = crypto.GenerateKey()
}
sealers := make([]*ecdsa.PrivateKey, 4)
for i := 0; i < len(sealers); i++ {
sealers[i], _ = crypto.GenerateKey()
}
// Create a Clique network based off of the Rinkeby config
genesis := makeGenesis(faucets, sealers)
var (
nodes []*node.Node
enodes []string
)
for _, sealer := range sealers {
// Start the node and wait until it's up
node, err := makeSealer(genesis, enodes)
if err != nil {
panic(err)
}
defer node.Stop()
for node.Server().NodeInfo().Ports.Listener == 0 {
time.Sleep(250 * time.Millisecond)
}
// Connect the node to al the previous ones
for _, enode := range enodes {
enode, err := discover.ParseNode(enode)
if err != nil {
panic(err)
}
node.Server().AddPeer(enode)
}
// Start tracking the node and it's enode url
nodes = append(nodes, node)
enode := fmt.Sprintf("enode://%s@127.0.0.1:%d", node.Server().NodeInfo().ID, node.Server().NodeInfo().Ports.Listener)
enodes = append(enodes, enode)
// Inject the signer key and start sealing with it
store := node.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
signer, err := store.ImportECDSA(sealer, "")
if err != nil {
panic(err)
}
if err := store.Unlock(signer, ""); err != nil {
panic(err)
}
}
// Iterate over all the nodes and start signing with them
time.Sleep(3 * time.Second)
for _, node := range nodes {
var ethereum *eth.Ethereum
if err := node.Service(&ethereum); err != nil {
panic(err)
}
if err := ethereum.StartMining(1); err != nil {
panic(err)
}
}
time.Sleep(3 * time.Second)
// Start injecting transactions from the faucet like crazy
nonces := make([]uint64, len(faucets))
for {
index := rand.Intn(len(faucets))
// Fetch the accessor for the relevant signer
var ethereum *eth.Ethereum
if err := nodes[index%len(nodes)].Service(&ethereum); err != nil {
panic(err)
}
// Create a self transaction and inject into the pool
tx, err := types.SignTx(types.NewTransaction(nonces[index], crypto.PubkeyToAddress(faucets[index].PublicKey), new(big.Int), 21000, big.NewInt(100000000000), nil), types.HomesteadSigner{}, faucets[index])
if err != nil {
panic(err)
}
if err := ethereum.TxPool().AddLocal(tx); err != nil {
panic(err)
}
nonces[index]++
// Wait if we're too saturated
if pend, _ := ethereum.TxPool().Stats(); pend > 2048 {
time.Sleep(100 * time.Millisecond)
}
}
}
// makeGenesis creates a custom Clique genesis block based on some pre-defined
// signer and faucet accounts.
func makeGenesis(faucets []*ecdsa.PrivateKey, sealers []*ecdsa.PrivateKey) *core.Genesis {
// Create a Clique network based off of the Rinkeby config
genesis := core.DefaultRinkebyGenesisBlock()
genesis.GasLimit = 25000000
genesis.Config.ChainID = big.NewInt(18)
genesis.Config.Clique.Period = 1
genesis.Config.EIP150Hash = common.Hash{}
genesis.Alloc = core.GenesisAlloc{}
for _, faucet := range faucets {
genesis.Alloc[crypto.PubkeyToAddress(faucet.PublicKey)] = core.GenesisAccount{
Balance: new(big.Int).Exp(big.NewInt(2), big.NewInt(128), nil),
}
}
// Sort the signers and embed into the extra-data section
signers := make([]common.Address, len(sealers))
for i, sealer := range sealers {
signers[i] = crypto.PubkeyToAddress(sealer.PublicKey)
}
for i := 0; i < len(signers); i++ {
for j := i + 1; j < len(signers); j++ {
if bytes.Compare(signers[i][:], signers[j][:]) > 0 {
signers[i], signers[j] = signers[j], signers[i]
}
}
}
genesis.ExtraData = make([]byte, 32+len(signers)*common.AddressLength+65)
for i, signer := range signers {
copy(genesis.ExtraData[32+i*common.AddressLength:], signer[:])
}
// Return the genesis block for initialization
return genesis
}
func makeSealer(genesis *core.Genesis, nodes []string) (*node.Node, error) {
// Define the basic configurations for the Ethereum node
datadir, _ := ioutil.TempDir("", "")
config := &node.Config{
Name: "geth",
Version: params.Version,
DataDir: datadir,
P2P: p2p.Config{
ListenAddr: "0.0.0.0:0",
NoDiscovery: true,
MaxPeers: 25,
},
NoUSB: true,
}
// Start the node and configure a full Ethereum node on it
stack, err := node.New(config)
if err != nil {
return nil, err
}
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return eth.New(ctx, &eth.Config{
Genesis: genesis,
NetworkId: genesis.Config.ChainID.Uint64(),
SyncMode: downloader.FullSync,
DatabaseCache: 256,
DatabaseHandles: 256,
TxPool: core.DefaultTxPoolConfig,
GPO: eth.DefaultConfig.GPO,
MinerGasPrice: big.NewInt(1),
MinerRecommit: time.Second,
})
}); err != nil {
return nil, err
}
// Start the node and return if successful
return stack, stack.Start()
}

197
miner/stress_ethash.go Normal file
View File

@ -0,0 +1,197 @@
// Copyright 2018 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/>.
// +build none
// This file contains a miner stress test based on the Ethash consensus engine.
package main
import (
"crypto/ecdsa"
"fmt"
"io/ioutil"
"math/big"
"math/rand"
"os"
"path/filepath"
"time"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/fdlimit"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/params"
)
func main() {
log.Root().SetHandler(log.LvlFilterHandler(log.LvlInfo, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
fdlimit.Raise(2048)
// Generate a batch of accounts to seal and fund with
faucets := make([]*ecdsa.PrivateKey, 128)
for i := 0; i < len(faucets); i++ {
faucets[i], _ = crypto.GenerateKey()
}
// Pre-generate the ethash mining DAG so we don't race
ethash.MakeDataset(1, filepath.Join(os.Getenv("HOME"), ".ethash"))
// Create an Ethash network based off of the Ropsten config
genesis := makeGenesis(faucets)
var (
nodes []*node.Node
enodes []string
)
for i := 0; i < 4; i++ {
// Start the node and wait until it's up
node, err := makeMiner(genesis, enodes)
if err != nil {
panic(err)
}
defer node.Stop()
for node.Server().NodeInfo().Ports.Listener == 0 {
time.Sleep(250 * time.Millisecond)
}
// Connect the node to al the previous ones
for _, enode := range enodes {
enode, err := discover.ParseNode(enode)
if err != nil {
panic(err)
}
node.Server().AddPeer(enode)
}
// Start tracking the node and it's enode url
nodes = append(nodes, node)
enode := fmt.Sprintf("enode://%s@127.0.0.1:%d", node.Server().NodeInfo().ID, node.Server().NodeInfo().Ports.Listener)
enodes = append(enodes, enode)
// Inject the signer key and start sealing with it
store := node.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
if _, err := store.NewAccount(""); err != nil {
panic(err)
}
}
// Iterate over all the nodes and start signing with them
time.Sleep(3 * time.Second)
for _, node := range nodes {
var ethereum *eth.Ethereum
if err := node.Service(&ethereum); err != nil {
panic(err)
}
if err := ethereum.StartMining(1); err != nil {
panic(err)
}
}
time.Sleep(3 * time.Second)
// Start injecting transactions from the faucets like crazy
nonces := make([]uint64, len(faucets))
for {
index := rand.Intn(len(faucets))
// Fetch the accessor for the relevant signer
var ethereum *eth.Ethereum
if err := nodes[index%len(nodes)].Service(&ethereum); err != nil {
panic(err)
}
// Create a self transaction and inject into the pool
tx, err := types.SignTx(types.NewTransaction(nonces[index], crypto.PubkeyToAddress(faucets[index].PublicKey), new(big.Int), 21000, big.NewInt(100000000000+rand.Int63n(65536)), nil), types.HomesteadSigner{}, faucets[index])
if err != nil {
panic(err)
}
if err := ethereum.TxPool().AddLocal(tx); err != nil {
panic(err)
}
nonces[index]++
// Wait if we're too saturated
if pend, _ := ethereum.TxPool().Stats(); pend > 2048 {
time.Sleep(100 * time.Millisecond)
}
}
}
// makeGenesis creates a custom Ethash genesis block based on some pre-defined
// faucet accounts.
func makeGenesis(faucets []*ecdsa.PrivateKey) *core.Genesis {
genesis := core.DefaultTestnetGenesisBlock()
genesis.Difficulty = params.MinimumDifficulty
genesis.GasLimit = 25000000
genesis.Config.ChainID = big.NewInt(18)
genesis.Config.EIP150Hash = common.Hash{}
genesis.Alloc = core.GenesisAlloc{}
for _, faucet := range faucets {
genesis.Alloc[crypto.PubkeyToAddress(faucet.PublicKey)] = core.GenesisAccount{
Balance: new(big.Int).Exp(big.NewInt(2), big.NewInt(128), nil),
}
}
return genesis
}
func makeMiner(genesis *core.Genesis, nodes []string) (*node.Node, error) {
// Define the basic configurations for the Ethereum node
datadir, _ := ioutil.TempDir("", "")
config := &node.Config{
Name: "geth",
Version: params.Version,
DataDir: datadir,
P2P: p2p.Config{
ListenAddr: "0.0.0.0:0",
NoDiscovery: true,
MaxPeers: 25,
},
NoUSB: true,
UseLightweightKDF: true,
}
// Start the node and configure a full Ethereum node on it
stack, err := node.New(config)
if err != nil {
return nil, err
}
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return eth.New(ctx, &eth.Config{
Genesis: genesis,
NetworkId: genesis.Config.ChainID.Uint64(),
SyncMode: downloader.FullSync,
DatabaseCache: 256,
DatabaseHandles: 256,
TxPool: core.DefaultTxPoolConfig,
GPO: eth.DefaultConfig.GPO,
Ethash: eth.DefaultConfig.Ethash,
MinerGasPrice: big.NewInt(1),
MinerRecommit: time.Second,
})
}); err != nil {
return nil, err
}
// Start the node and return if successful
return stack, stack.Start()
}