laconicd/main.go

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// The implementation below is to be considered highly unstable and a continual
// WIP. It is a means to replicate and test replaying Ethereum transactions
// using the Cosmos SDK and the EVM. The ultimate result will be what is known
// as Ethermint.
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package main
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import (
"bytes"
"encoding/json"
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"flag"
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"fmt"
"io"
"os"
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"runtime/pprof"
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"time"
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"github.com/cosmos/ethermint/core"
"github.com/cosmos/ethermint/state"
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ethcommon "github.com/ethereum/go-ethereum/common"
ethmisc "github.com/ethereum/go-ethereum/consensus/misc"
ethcore "github.com/ethereum/go-ethereum/core"
ethstate "github.com/ethereum/go-ethereum/core/state"
ethtypes "github.com/ethereum/go-ethereum/core/types"
ethvm "github.com/ethereum/go-ethereum/core/vm"
ethparams "github.com/ethereum/go-ethereum/params"
ethrlp "github.com/ethereum/go-ethereum/rlp"
dbm "github.com/tendermint/tendermint/libs/db"
)
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var cpuprofile = flag.String("cpuprofile", "", "write cpu profile `file`")
var blockchain = flag.String("blockchain", "blockchain", "file containing blocks to load")
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var (
// TODO: Document...
miner501 = ethcommon.HexToAddress("0x35e8e5dC5FBd97c5b421A80B596C030a2Be2A04D")
genInvestor = ethcommon.HexToAddress("0x756F45E3FA69347A9A973A725E3C98bC4db0b5a0")
)
// TODO: Document...
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func main() {
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flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
fmt.Printf("could not create CPU profile: %v\n", err)
return
}
if err := pprof.StartCPUProfile(f); err != nil {
fmt.Printf("could not start CPU profile: %v\n", err)
return
}
defer pprof.StopCPUProfile()
}
stateDB := dbm.NewDB("state", dbm.LevelDBBackend, "")
codeDB := dbm.NewDB("code", dbm.LevelDBBackend, "")
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ethermintDB, err := state.NewDatabase(stateDB, codeDB)
if err != nil {
panic(err)
}
// start with empty root hash (i.e. empty state)
gethStateDB, err := ethstate.New(ethcommon.Hash{}, ethermintDB)
if err != nil {
panic(err)
}
genBlock := ethcore.DefaultGenesisBlock()
for addr, account := range genBlock.Alloc {
gethStateDB.AddBalance(addr, account.Balance)
gethStateDB.SetCode(addr, account.Code)
gethStateDB.SetNonce(addr, account.Nonce)
for key, value := range account.Storage {
gethStateDB.SetState(addr, key, value)
}
}
// get balance of one of the genesis account having 200 ETH
b := gethStateDB.GetBalance(genInvestor)
fmt.Printf("balance of %s: %s\n", genInvestor.String(), b)
// commit the geth stateDB with 'false' to delete empty objects
genRoot, err := gethStateDB.Commit(false)
if err != nil {
panic(err)
}
commitID := ethermintDB.Commit()
fmt.Printf("commitID after genesis: %v\n", commitID)
fmt.Printf("genesis state root hash: %x\n", genRoot[:])
// file with blockchain data exported from geth by using "geth exportdb"
// command.
//
// TODO: Allow this to be configurable
input, err := os.Open(*blockchain)
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if err != nil {
panic(err)
}
defer input.Close()
// ethereum mainnet config
chainConfig := ethparams.MainnetChainConfig
// create RLP stream for exported blocks
stream := ethrlp.NewStream(input, 0)
var (
block ethtypes.Block
root500 ethcommon.Hash // root hash after block 500
root501 ethcommon.Hash // root hash after block 501
)
prevRoot := genRoot
ethermintDB.Tracing = true
chainContext := core.NewChainContext()
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vmConfig := ethvm.Config{}
n := 0
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startTime := time.Now()
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for {
if err = stream.Decode(&block); err == io.EOF {
err = nil
break
} else if err != nil {
panic(fmt.Errorf("failed to decode at block %d: %s", block.NumberU64(), err))
}
// don't import first block
if block.NumberU64() == 0 {
continue
}
header := block.Header()
chainContext.Coinbase = header.Coinbase
chainContext.SetHeader(block.NumberU64(), header)
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gethStateDB, err := ethstate.New(prevRoot, ethermintDB)
if err != nil {
panic(fmt.Errorf("failed to instantiate geth state.StateDB at block %d: %v", block.NumberU64(), err))
}
var (
receipts ethtypes.Receipts
usedGas = new(uint64)
allLogs []*ethtypes.Log
gp = new(ethcore.GasPool).AddGas(block.GasLimit())
)
if chainConfig.DAOForkSupport && chainConfig.DAOForkBlock != nil && chainConfig.DAOForkBlock.Cmp(block.Number()) == 0 {
ethmisc.ApplyDAOHardFork(gethStateDB)
}
for i, tx := range block.Transactions() {
gethStateDB.Prepare(tx.Hash(), block.Hash(), i)
txHash := tx.Hash()
// TODO: Why this address?
if bytes.Equal(txHash[:], ethcommon.FromHex("0xc438cfcc3b74a28741bda361032f1c6362c34aa0e1cedff693f31ec7d6a12717")) {
vmConfig.Tracer = ethvm.NewStructLogger(&ethvm.LogConfig{})
vmConfig.Debug = true
}
receipt, _, err := ethcore.ApplyTransaction(chainConfig, chainContext, nil, gp, gethStateDB, header, tx, usedGas, vmConfig)
if vmConfig.Tracer != nil {
w, err := os.Create("structlogs.txt")
if err != nil {
panic(err)
}
encoder := json.NewEncoder(w)
logs := FormatLogs(vmConfig.Tracer.(*ethvm.StructLogger).StructLogs())
if err := encoder.Encode(logs); err != nil {
panic(err)
}
if err := w.Close(); err != nil {
panic(err)
}
vmConfig.Debug = false
vmConfig.Tracer = nil
}
if err != nil {
panic(fmt.Errorf("at block %d, tx %x: %v", block.NumberU64(), tx.Hash(), err))
}
receipts = append(receipts, receipt)
allLogs = append(allLogs, receipt.Logs...)
}
// apply mining rewards to the geth stateDB
accumulateRewards(chainConfig, gethStateDB, header, block.Uncles())
// commit block in geth
prevRoot, err = gethStateDB.Commit(chainConfig.IsEIP158(block.Number()))
if err != nil {
panic(fmt.Errorf("at block %d: %v", block.NumberU64(), err))
}
// commit block in Ethermint
ethermintDB.Commit()
//fmt.Printf("commitID after block %d: %v\n", block.NumberU64(), commitID)
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switch block.NumberU64() {
case 500:
root500 = prevRoot
case 501:
root501 = prevRoot
}
n++
if (n % 10000) == 0 {
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fmt.Printf("processed %d blocks, time so far: %v\n", n, time.Since(startTime))
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}
//if n >= 20000 {
// break
//}
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}
fmt.Printf("processed %d blocks\n", n)
ethermintDB.Tracing = true
genState, err := ethstate.New(genRoot, ethermintDB)
if err != nil {
panic(err)
}
fmt.Printf("balance of one of the genesis investors: %s\n", genState.GetBalance(genInvestor))
// try to create a new geth stateDB from root of the block 500
fmt.Printf("root500: %x\n", root500[:])
state500, err := ethstate.New(root500, ethermintDB)
if err != nil {
panic(err)
}
miner501BalanceAt500 := state500.GetBalance(miner501)
state501, err := ethstate.New(root501, ethermintDB)
if err != nil {
panic(err)
}
miner501BalanceAt501 := state501.GetBalance(miner501)
fmt.Printf("investor's balance after block 500: %d\n", state500.GetBalance(genInvestor))
fmt.Printf("miner of block 501's balance after block 500: %d\n", miner501BalanceAt500)
fmt.Printf("miner of block 501's balance after block 501: %d\n", miner501BalanceAt501)
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}