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api_backend.go
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/
api_backend.go
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// Copyright 2015 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 eth
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/ethereum/go-ethereum/tomox"
"io/ioutil"
"math/big"
"path/filepath"
"github.com/ethereum/go-ethereum/consensus/posv"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/contracts"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/bloombits"
"github.com/ethereum/go-ethereum/core/state"
stateDatabase "github.com/ethereum/go-ethereum/core/state"
"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/eth/gasprice"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
)
// EthApiBackend implements ethapi.Backend for full nodes
type EthApiBackend struct {
eth *Ethereum
gpo *gasprice.Oracle
}
func (b *EthApiBackend) ChainConfig() *params.ChainConfig {
return b.eth.chainConfig
}
func (b *EthApiBackend) CurrentBlock() *types.Block {
return b.eth.blockchain.CurrentBlock()
}
func (b *EthApiBackend) SetHead(number uint64) {
b.eth.protocolManager.downloader.Cancel()
b.eth.blockchain.SetHead(number)
}
func (b *EthApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
// Pending block is only known by the miner
if blockNr == rpc.PendingBlockNumber {
block := b.eth.miner.PendingBlock()
return block.Header(), nil
}
// Otherwise resolve and return the block
if blockNr == rpc.LatestBlockNumber {
return b.eth.blockchain.CurrentBlock().Header(), nil
}
return b.eth.blockchain.GetHeaderByNumber(uint64(blockNr)), nil
}
func (b *EthApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
// Pending block is only known by the miner
if blockNr == rpc.PendingBlockNumber {
block := b.eth.miner.PendingBlock()
return block, nil
}
// Otherwise resolve and return the block
if blockNr == rpc.LatestBlockNumber {
return b.eth.blockchain.CurrentBlock(), nil
}
return b.eth.blockchain.GetBlockByNumber(uint64(blockNr)), nil
}
func (b *EthApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
// Pending state is only known by the miner
if blockNr == rpc.PendingBlockNumber {
block, state := b.eth.miner.Pending()
return state, block.Header(), nil
}
// Otherwise resolve the block number and return its state
header, err := b.HeaderByNumber(ctx, blockNr)
if header == nil || err != nil {
return nil, nil, err
}
stateDb, err := b.eth.BlockChain().StateAt(header.Root)
return stateDb, header, err
}
func (b *EthApiBackend) GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error) {
return b.eth.blockchain.GetBlockByHash(blockHash), nil
}
func (b *EthApiBackend) GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error) {
return core.GetBlockReceipts(b.eth.chainDb, blockHash, core.GetBlockNumber(b.eth.chainDb, blockHash)), nil
}
func (b *EthApiBackend) GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error) {
receipts := core.GetBlockReceipts(b.eth.chainDb, blockHash, core.GetBlockNumber(b.eth.chainDb, blockHash))
if receipts == nil {
return nil, nil
}
logs := make([][]*types.Log, len(receipts))
for i, receipt := range receipts {
logs[i] = receipt.Logs
}
return logs, nil
}
func (b *EthApiBackend) GetTd(blockHash common.Hash) *big.Int {
return b.eth.blockchain.GetTdByHash(blockHash)
}
func (b *EthApiBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header, vmCfg vm.Config) (*vm.EVM, func() error, error) {
state.SetBalance(msg.From(), math.MaxBig256)
vmError := func() error { return nil }
context := core.NewEVMContext(msg, header, b.eth.BlockChain(), nil)
return vm.NewEVM(context, state, b.eth.chainConfig, vmCfg), vmError, nil
}
func (b *EthApiBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
return b.eth.BlockChain().SubscribeRemovedLogsEvent(ch)
}
func (b *EthApiBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
return b.eth.BlockChain().SubscribeChainEvent(ch)
}
func (b *EthApiBackend) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
return b.eth.BlockChain().SubscribeChainHeadEvent(ch)
}
func (b *EthApiBackend) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription {
return b.eth.BlockChain().SubscribeChainSideEvent(ch)
}
func (b *EthApiBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
return b.eth.BlockChain().SubscribeLogsEvent(ch)
}
func (b *EthApiBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
return b.eth.txPool.AddLocal(signedTx)
}
// SendOrderTx send order via backend
func (b *EthApiBackend) SendOrderTx(ctx context.Context, signedTx *types.OrderTransaction) error {
return b.eth.orderPool.AddLocal(signedTx)
}
func (b *EthApiBackend) GetPoolTransactions() (types.Transactions, error) {
pending, err := b.eth.txPool.Pending()
if err != nil {
return nil, err
}
var txs types.Transactions
for _, batch := range pending {
txs = append(txs, batch...)
}
return txs, nil
}
func (b *EthApiBackend) GetPoolTransaction(hash common.Hash) *types.Transaction {
return b.eth.txPool.Get(hash)
}
func (b *EthApiBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
return b.eth.txPool.State().GetNonce(addr), nil
}
func (b *EthApiBackend) Stats() (pending int, queued int) {
return b.eth.txPool.Stats()
}
func (b *EthApiBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
return b.eth.TxPool().Content()
}
func (b *EthApiBackend) SubscribeTxPreEvent(ch chan<- core.TxPreEvent) event.Subscription {
return b.eth.TxPool().SubscribeTxPreEvent(ch)
}
func (b *EthApiBackend) Downloader() *downloader.Downloader {
return b.eth.Downloader()
}
func (b *EthApiBackend) ProtocolVersion() int {
return b.eth.EthVersion()
}
func (b *EthApiBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
return b.gpo.SuggestPrice(ctx)
}
func (b *EthApiBackend) ChainDb() ethdb.Database {
return b.eth.ChainDb()
}
func (b *EthApiBackend) EventMux() *event.TypeMux {
return b.eth.EventMux()
}
func (b *EthApiBackend) AccountManager() *accounts.Manager {
return b.eth.AccountManager()
}
func (b *EthApiBackend) BloomStatus() (uint64, uint64) {
sections, _, _ := b.eth.bloomIndexer.Sections()
return params.BloomBitsBlocks, sections
}
func (b *EthApiBackend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession) {
for i := 0; i < bloomFilterThreads; i++ {
go session.Multiplex(bloomRetrievalBatch, bloomRetrievalWait, b.eth.bloomRequests)
}
}
func (b *EthApiBackend) GetIPCClient() (*ethclient.Client, error) {
client, err := b.eth.blockchain.GetClient()
if err != nil {
return nil, err
}
return client, nil
}
func (b *EthApiBackend) GetEngine() consensus.Engine {
return b.eth.engine
}
func (s *EthApiBackend) GetRewardByHash(hash common.Hash) map[string]interface{} {
header := s.eth.blockchain.GetHeaderByHash(hash)
if header != nil {
data, err := ioutil.ReadFile(filepath.Join(common.StoreRewardFolder, header.Number.String()+"."+header.Hash().Hex()))
if err == nil {
rewards := make(map[string]interface{})
err = json.Unmarshal(data, &rewards)
if err == nil {
return rewards
}
} else {
data, err = ioutil.ReadFile(filepath.Join(common.StoreRewardFolder, header.Number.String()+"."+header.HashNoValidator().Hex()))
if err == nil {
rewards := make(map[string]interface{})
err = json.Unmarshal(data, &rewards)
if err == nil {
return rewards
}
}
}
}
return make(map[string]interface{})
}
// GetVotersRewards return a map of voters of snapshot at given block hash
// there is a function engine.HookReward nearly does the same thing but
// it does change the stateDB too - so can't use it here
// Steps:
// 1. Checking back to state of last checkpoint
// 2. Get list signers + reward at that checkpoint
// 3. Find out the list signers_reward for input masternode's reward
// 4. Calculate voters's rewards for input masternode
func (b *EthApiBackend) GetVotersRewards(masternodeAddr common.Address) map[common.Address]*big.Int {
chain := b.eth.blockchain
block := chain.CurrentBlock()
number := block.Number().Uint64()
engine := b.GetEngine().(*posv.Posv)
foundationWalletAddr := chain.Config().Posv.FoudationWalletAddr
lastCheckpointNumber := number - (number % b.ChainConfig().Posv.Epoch) - b.ChainConfig().Posv.Epoch // calculate for 2 epochs ago
lastCheckpointBlock := chain.GetBlockByNumber(lastCheckpointNumber)
rCheckpoint := chain.Config().Posv.RewardCheckpoint
state, err := chain.StateAt(lastCheckpointBlock.Root())
if err != nil {
fmt.Println("ERROR Trying to getting state at", lastCheckpointNumber, " Error ", err)
return nil
}
if foundationWalletAddr == (common.Address{}) {
log.Error("Foundation Wallet Address is empty", "error", foundationWalletAddr)
return nil
}
if lastCheckpointNumber <= 0 || lastCheckpointNumber-rCheckpoint <= 0 || foundationWalletAddr == (common.Address{}) {
return nil
}
// Get signers in blockSigner smartcontract.
// Get reward inflation.
chainReward := new(big.Int).Mul(new(big.Int).SetUint64(chain.Config().Posv.Reward), new(big.Int).SetUint64(params.Ether))
chainReward = rewardInflation(chainReward, lastCheckpointNumber, common.BlocksPerYear)
totalSigner := new(uint64)
signers, err := contracts.GetRewardForCheckpoint(engine, chain, lastCheckpointBlock.Header(), rCheckpoint, totalSigner)
if err != nil {
log.Crit("Fail to get signers for reward checkpoint", "error", err)
return nil
}
rewardSigners, err := contracts.CalculateRewardForSigner(chainReward, signers, *totalSigner)
if err != nil {
log.Crit("Fail to calculate reward for signers", "error", err)
return nil
}
if len(signers) <= 0 {
return nil
}
// Add reward for coin voters of input masternode.
var voterResults map[common.Address]*big.Int
for signer, calcReward := range rewardSigners {
if signer == masternodeAddr {
err, rewards := contracts.CalculateRewardForHolders(foundationWalletAddr, state, masternodeAddr, calcReward, number)
if err != nil {
log.Crit("Fail to calculate reward for holders.", "error", err)
return nil
}
voterResults = rewards
break
}
}
return voterResults
}
// GetVotersCap return all voters's capability at a checkpoint
func (b *EthApiBackend) GetVotersCap(checkpoint *big.Int, masterAddr common.Address, voters []common.Address) map[common.Address]*big.Int {
chain := b.eth.blockchain
checkpointBlock := chain.GetBlockByNumber(checkpoint.Uint64())
state, err := chain.StateAt(checkpointBlock.Root())
if err != nil {
fmt.Println("ERROR Trying to getting state at", checkpoint, " Error ", err)
return nil
}
voterCaps := make(map[common.Address]*big.Int)
for _, voteAddr := range voters {
voterCap := stateDatabase.GetVoterCap(state, masterAddr, voteAddr)
voterCaps[voteAddr] = voterCap
}
return voterCaps
}
// GetEpochDuration return latest generating velocity epoch by minute
// ie 30min for each epoch
func (b *EthApiBackend) GetEpochDuration() *big.Int {
chain := b.eth.blockchain
block := chain.CurrentBlock()
number := block.Number().Uint64()
lastCheckpointNumber := number - (number % b.ChainConfig().Posv.Epoch)
lastCheckpointBlockTime := chain.GetBlockByNumber(lastCheckpointNumber).Time()
secondToLastCheckpointNumber := lastCheckpointNumber - b.ChainConfig().Posv.Epoch
secondToLastCheckpointBlockTime := chain.GetBlockByNumber(secondToLastCheckpointNumber).Time()
return secondToLastCheckpointBlockTime.Add(secondToLastCheckpointBlockTime, lastCheckpointBlockTime.Mul(lastCheckpointBlockTime, new(big.Int).SetInt64(-1)))
}
// GetMasternodesCap return a cap of all masternode at a checkpoint
func (b *EthApiBackend) GetMasternodesCap(checkpoint uint64) map[common.Address]*big.Int {
checkpointBlock := b.eth.blockchain.GetBlockByNumber(checkpoint)
state, err := b.eth.blockchain.StateAt(checkpointBlock.Root())
if err != nil {
fmt.Println("ERROR Trying to getting state at", checkpoint, " Error ", err)
return nil
}
candicates := stateDatabase.GetCandidates(state)
masternodesCap := map[common.Address]*big.Int{}
for _, candicate := range candicates {
masternodesCap[candicate] = stateDatabase.GetCandidateCap(state, candicate)
}
return masternodesCap
}
func (b *EthApiBackend) GetBlocksHashCache(blockNr uint64) []common.Hash {
return b.eth.blockchain.GetBlocksHashCache(blockNr)
}
func (b *EthApiBackend) AreTwoBlockSamePath(bh1 common.Hash, bh2 common.Hash) bool {
return b.eth.blockchain.AreTwoBlockSamePath(bh1, bh2)
}
// GetOrderNonce get order nonce
func (b *EthApiBackend) GetOrderNonce(address common.Hash) (uint64, error) {
tomoxService := b.eth.GetTomoX()
if tomoxService != nil {
tomoxState, err := tomoxService.GetTomoxState(b.CurrentBlock())
if err != nil {
return 0, err
}
return tomoxState.GetNonce(address), nil
}
return 0, errors.New("cannot find tomox service")
}
func (b *EthApiBackend) TomoxService() *tomox.TomoX {
return b.eth.TomoX
}