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api.go
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api.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 ethapi
import (
"bytes"
"context"
"errors"
"fmt"
"math/big"
"sort"
"strings"
"time"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/consensus/posv"
contractValidator "github.com/ethereum/go-ethereum/contracts/validator/contract"
"github.com/ethereum/go-ethereum/core"
"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/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
)
const (
defaultGasPrice = 50 * params.Shannon
// statuses of candidates
statusMasternode = "MASTERNODE"
statusSlashed = "SLASHED"
statusProposed = "PROPOSED"
fieldStatus = "status"
fieldCapacity = "capacity"
fieldCandidates = "candidates"
fieldSuccess = "success"
fieldEpoch = "epoch"
)
var errEmptyHeader = errors.New("empty header")
// PublicEthereumAPI provides an API to access Ethereum related information.
// It offers only methods that operate on public data that is freely available to anyone.
type PublicEthereumAPI struct {
b Backend
}
// NewPublicEthereumAPI creates a new Ethereum protocol API.
func NewPublicEthereumAPI(b Backend) *PublicEthereumAPI {
return &PublicEthereumAPI{b}
}
// GasPrice returns a suggestion for a gas price.
func (s *PublicEthereumAPI) GasPrice(ctx context.Context) (*big.Int, error) {
return s.b.SuggestPrice(ctx)
}
// ProtocolVersion returns the current Ethereum protocol version this node supports
func (s *PublicEthereumAPI) ProtocolVersion() hexutil.Uint {
return hexutil.Uint(s.b.ProtocolVersion())
}
// Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not
// yet received the latest block headers from its pears. In case it is synchronizing:
// - startingBlock: block number this node started to synchronise from
// - currentBlock: block number this node is currently importing
// - highestBlock: block number of the highest block header this node has received from peers
// - pulledStates: number of state entries processed until now
// - knownStates: number of known state entries that still need to be pulled
func (s *PublicEthereumAPI) Syncing() (interface{}, error) {
progress := s.b.Downloader().Progress()
// Return not syncing if the synchronisation already completed
if progress.CurrentBlock >= progress.HighestBlock {
return false, nil
}
// Otherwise gather the block sync stats
return map[string]interface{}{
"startingBlock": hexutil.Uint64(progress.StartingBlock),
"currentBlock": hexutil.Uint64(progress.CurrentBlock),
"highestBlock": hexutil.Uint64(progress.HighestBlock),
"pulledStates": hexutil.Uint64(progress.PulledStates),
"knownStates": hexutil.Uint64(progress.KnownStates),
}, nil
}
// PublicTxPoolAPI offers and API for the transaction pool. It only operates on data that is non confidential.
type PublicTxPoolAPI struct {
b Backend
}
// NewPublicTxPoolAPI creates a new tx pool service that gives information about the transaction pool.
func NewPublicTxPoolAPI(b Backend) *PublicTxPoolAPI {
return &PublicTxPoolAPI{b}
}
// Content returns the transactions contained within the transaction pool.
func (s *PublicTxPoolAPI) Content() map[string]map[string]map[string]*RPCTransaction {
content := map[string]map[string]map[string]*RPCTransaction{
"pending": make(map[string]map[string]*RPCTransaction),
"queued": make(map[string]map[string]*RPCTransaction),
}
pending, queue := s.b.TxPoolContent()
// Flatten the pending transactions
for account, txs := range pending {
dump := make(map[string]*RPCTransaction)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
}
content["pending"][account.Hex()] = dump
}
// Flatten the queued transactions
for account, txs := range queue {
dump := make(map[string]*RPCTransaction)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
}
content["queued"][account.Hex()] = dump
}
return content
}
// Status returns the number of pending and queued transaction in the pool.
func (s *PublicTxPoolAPI) Status() map[string]hexutil.Uint {
pending, queue := s.b.Stats()
return map[string]hexutil.Uint{
"pending": hexutil.Uint(pending),
"queued": hexutil.Uint(queue),
}
}
// Inspect retrieves the content of the transaction pool and flattens it into an
// easily inspectable list.
func (s *PublicTxPoolAPI) Inspect() map[string]map[string]map[string]string {
content := map[string]map[string]map[string]string{
"pending": make(map[string]map[string]string),
"queued": make(map[string]map[string]string),
}
pending, queue := s.b.TxPoolContent()
// Define a formatter to flatten a transaction into a string
var format = func(tx *types.Transaction) string {
if to := tx.To(); to != nil {
return fmt.Sprintf("%s: %v wei + %v gas × %v wei", tx.To().Hex(), tx.Value(), tx.Gas(), tx.GasPrice())
}
return fmt.Sprintf("contract creation: %v wei + %v gas × %v wei", tx.Value(), tx.Gas(), tx.GasPrice())
}
// Flatten the pending transactions
for account, txs := range pending {
dump := make(map[string]string)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = format(tx)
}
content["pending"][account.Hex()] = dump
}
// Flatten the queued transactions
for account, txs := range queue {
dump := make(map[string]string)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = format(tx)
}
content["queued"][account.Hex()] = dump
}
return content
}
// PublicAccountAPI provides an API to access accounts managed by this node.
// It offers only methods that can retrieve accounts.
type PublicAccountAPI struct {
am *accounts.Manager
}
// NewPublicAccountAPI creates a new PublicAccountAPI.
func NewPublicAccountAPI(am *accounts.Manager) *PublicAccountAPI {
return &PublicAccountAPI{am: am}
}
// Accounts returns the collection of accounts this node manages
func (s *PublicAccountAPI) Accounts() []common.Address {
addresses := make([]common.Address, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
for _, account := range wallet.Accounts() {
addresses = append(addresses, account.Address)
}
}
return addresses
}
// PrivateAccountAPI provides an API to access accounts managed by this node.
// It offers methods to create, (un)lock en list accounts. Some methods accept
// passwords and are therefore considered private by default.
type PrivateAccountAPI struct {
am *accounts.Manager
nonceLock *AddrLocker
b Backend
}
// NewPrivateAccountAPI create a new PrivateAccountAPI.
func NewPrivateAccountAPI(b Backend, nonceLock *AddrLocker) *PrivateAccountAPI {
return &PrivateAccountAPI{
am: b.AccountManager(),
nonceLock: nonceLock,
b: b,
}
}
// ListAccounts will return a list of addresses for accounts this node manages.
func (s *PrivateAccountAPI) ListAccounts() []common.Address {
addresses := make([]common.Address, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
for _, account := range wallet.Accounts() {
addresses = append(addresses, account.Address)
}
}
return addresses
}
// rawWallet is a JSON representation of an accounts.Wallet interface, with its
// data contents extracted into plain fields.
type rawWallet struct {
URL string `json:"url"`
Status string `json:"status"`
Failure string `json:"failure,omitempty"`
Accounts []accounts.Account `json:"accounts,omitempty"`
}
// ListWallets will return a list of wallets this node manages.
func (s *PrivateAccountAPI) ListWallets() []rawWallet {
wallets := make([]rawWallet, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
status, failure := wallet.Status()
raw := rawWallet{
URL: wallet.URL().String(),
Status: status,
Accounts: wallet.Accounts(),
}
if failure != nil {
raw.Failure = failure.Error()
}
wallets = append(wallets, raw)
}
return wallets
}
// OpenWallet initiates a hardware wallet opening procedure, establishing a USB
// connection and attempting to authenticate via the provided passphrase. Note,
// the method may return an extra challenge requiring a second open (e.g. the
// Trezor PIN matrix challenge).
func (s *PrivateAccountAPI) OpenWallet(url string, passphrase *string) error {
wallet, err := s.am.Wallet(url)
if err != nil {
return err
}
pass := ""
if passphrase != nil {
pass = *passphrase
}
return wallet.Open(pass)
}
// DeriveAccount requests a HD wallet to derive a new account, optionally pinning
// it for later reuse.
func (s *PrivateAccountAPI) DeriveAccount(url string, path string, pin *bool) (accounts.Account, error) {
wallet, err := s.am.Wallet(url)
if err != nil {
return accounts.Account{}, err
}
derivPath, err := accounts.ParseDerivationPath(path)
if err != nil {
return accounts.Account{}, err
}
if pin == nil {
pin = new(bool)
}
return wallet.Derive(derivPath, *pin)
}
// NewAccount will create a new account and returns the address for the new account.
func (s *PrivateAccountAPI) NewAccount(password string) (common.Address, error) {
acc, err := fetchKeystore(s.am).NewAccount(password)
if err == nil {
return acc.Address, nil
}
return common.Address{}, err
}
// fetchKeystore retrives the encrypted keystore from the account manager.
func fetchKeystore(am *accounts.Manager) *keystore.KeyStore {
return am.Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
}
// ImportRawKey stores the given hex encoded ECDSA key into the key directory,
// encrypting it with the passphrase.
func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
key, err := crypto.HexToECDSA(privkey)
if err != nil {
return common.Address{}, err
}
acc, err := fetchKeystore(s.am).ImportECDSA(key, password)
return acc.Address, err
}
// UnlockAccount will unlock the account associated with the given address with
// the given password for duration seconds. If duration is nil it will use a
// default of 300 seconds. It returns an indication if the account was unlocked.
func (s *PrivateAccountAPI) UnlockAccount(addr common.Address, password string, duration *uint64) (bool, error) {
const max = uint64(time.Duration(math.MaxInt64) / time.Second)
var d time.Duration
if duration == nil {
d = 300 * time.Second
} else if *duration > max {
return false, errors.New("unlock duration too large")
} else {
d = time.Duration(*duration) * time.Second
}
err := fetchKeystore(s.am).TimedUnlock(accounts.Account{Address: addr}, password, d)
return err == nil, err
}
// LockAccount will lock the account associated with the given address when it's unlocked.
func (s *PrivateAccountAPI) LockAccount(addr common.Address) bool {
return fetchKeystore(s.am).Lock(addr) == nil
}
// signTransactions sets defaults and signs the given transaction
// NOTE: the caller needs to ensure that the nonceLock is held, if applicable,
// and release it after the transaction has been submitted to the tx pool
func (s *PrivateAccountAPI) signTransaction(ctx context.Context, args SendTxArgs, passwd string) (*types.Transaction, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: args.From}
wallet, err := s.am.Find(account)
if err != nil {
return nil, err
}
// Set some sanity defaults and terminate on failure
if err := args.setDefaults(ctx, s.b); err != nil {
return nil, err
}
// Assemble the transaction and sign with the wallet
tx := args.toTransaction()
var chainID *big.Int
if config := s.b.ChainConfig(); config.IsEIP155(s.b.CurrentBlock().Number()) {
chainID = config.ChainId
}
return wallet.SignTxWithPassphrase(account, passwd, tx, chainID)
}
// SendTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given passwd isn't
// able to decrypt the key it fails.
func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {
if args.Nonce == nil {
// Hold the addresse's mutex around signing to prevent concurrent assignment of
// the same nonce to multiple accounts.
s.nonceLock.LockAddr(args.From)
defer s.nonceLock.UnlockAddr(args.From)
}
signed, err := s.signTransaction(ctx, args, passwd)
if err != nil {
return common.Hash{}, err
}
return submitTransaction(ctx, s.b, signed)
}
// SignTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given passwd isn't
// able to decrypt the key it fails. The transaction is returned in RLP-form, not broadcast
// to other nodes
func (s *PrivateAccountAPI) SignTransaction(ctx context.Context, args SendTxArgs, passwd string) (*SignTransactionResult, error) {
// No need to obtain the noncelock mutex, since we won't be sending this
// tx into the transaction pool, but right back to the user
if args.Gas == nil {
return nil, fmt.Errorf("gas not specified")
}
if args.GasPrice == nil {
return nil, fmt.Errorf("gasPrice not specified")
}
if args.Nonce == nil {
return nil, fmt.Errorf("nonce not specified")
}
signed, err := s.signTransaction(ctx, args, passwd)
if err != nil {
return nil, err
}
data, err := rlp.EncodeToBytes(signed)
if err != nil {
return nil, err
}
return &SignTransactionResult{data, signed}, nil
}
// signHash is a helper function that calculates a hash for the given message that can be
// safely used to calculate a signature from.
//
// The hash is calulcated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func signHash(data []byte) []byte {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg))
}
// Sign calculates an Ethereum ECDSA signature for:
// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The key used to calculate the signature is decrypted with the given password.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr common.Address, passwd string) (hexutil.Bytes, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: addr}
wallet, err := s.b.AccountManager().Find(account)
if err != nil {
return nil, err
}
// Assemble sign the data with the wallet
signature, err := wallet.SignHashWithPassphrase(account, passwd, signHash(data))
if err != nil {
return nil, err
}
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
return signature, nil
}
// EcRecover returns the address for the account that was used to create the signature.
// Note, this function is compatible with eth_sign and personal_sign. As such it recovers
// the address of:
// hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message})
// addr = ecrecover(hash, signature)
//
// Note, the signature must conform to the secp256k1 curve R, S and V values, where
// the V value must be be 27 or 28 for legacy reasons.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != 65 {
return common.Address{}, fmt.Errorf("signature must be 65 bytes long")
}
if sig[64] != 27 && sig[64] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.Ecrecover(signHash(data), sig)
if err != nil {
return common.Address{}, err
}
pubKey := crypto.ToECDSAPub(rpk)
recoveredAddr := crypto.PubkeyToAddress(*pubKey)
return recoveredAddr, nil
}
// SignAndSendTransaction was renamed to SendTransaction. This method is deprecated
// and will be removed in the future. It primary goal is to give clients time to update.
func (s *PrivateAccountAPI) SignAndSendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {
return s.SendTransaction(ctx, args, passwd)
}
// PublicBlockChainAPI provides an API to access the Ethereum blockchain.
// It offers only methods that operate on public data that is freely available to anyone.
type PublicBlockChainAPI struct {
b Backend
}
// NewPublicBlockChainAPI creates a new Ethereum blockchain API.
func NewPublicBlockChainAPI(b Backend) *PublicBlockChainAPI {
return &PublicBlockChainAPI{b}
}
// BlockNumber returns the block number of the chain head.
func (s *PublicBlockChainAPI) BlockNumber() *big.Int {
header, _ := s.b.HeaderByNumber(context.Background(), rpc.LatestBlockNumber) // latest header should always be available
return header.Number
}
// BlockNumber returns the block number of the chain head.
func (s *PublicBlockChainAPI) GetRewardByHash(hash common.Hash) map[string]interface{} {
return s.b.GetRewardByHash(hash)
}
// GetBalance returns the amount of wei for the given address in the state of the
// given block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta
// block numbers are also allowed.
func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (*big.Int, error) {
state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
if state == nil || err != nil {
return nil, err
}
b := state.GetBalance(address)
return b, state.Error()
}
// GetBlockByNumber returns the requested block. When blockNr is -1 the chain head is returned. When fullTx is true all
// transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetBlockByNumber(ctx context.Context, blockNr rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
block, err := s.b.BlockByNumber(ctx, blockNr)
if block != nil {
response, err := s.rpcOutputBlock(block, true, fullTx, ctx)
if err == nil && blockNr == rpc.PendingBlockNumber {
// Pending blocks need to nil out a few fields
for _, field := range []string{"hash", "nonce", "miner"} {
response[field] = nil
}
}
return response, err
}
return nil, err
}
// GetBlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
// detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetBlockByHash(ctx context.Context, blockHash common.Hash, fullTx bool) (map[string]interface{}, error) {
block, err := s.b.GetBlock(ctx, blockHash)
if block != nil {
return s.rpcOutputBlock(block, true, fullTx, ctx)
}
return nil, err
}
// GetUncleByBlockNumberAndIndex returns the uncle block for the given block hash and index. When fullTx is true
// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetUncleByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index hexutil.Uint) (map[string]interface{}, error) {
block, err := s.b.BlockByNumber(ctx, blockNr)
if block != nil {
uncles := block.Uncles()
if index >= hexutil.Uint(len(uncles)) {
log.Debug("Requested uncle not found", "number", blockNr, "hash", block.Hash(), "index", index)
return nil, nil
}
block = types.NewBlockWithHeader(uncles[index])
return s.rpcOutputBlock(block, false, false, ctx)
}
return nil, err
}
// GetUncleByBlockHashAndIndex returns the uncle block for the given block hash and index. When fullTx is true
// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
// DEPRECATED SINCE 1.0
func (s *PublicBlockChainAPI) GetUncleByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index hexutil.Uint) (map[string]interface{}, error) {
block, err := s.b.GetBlock(ctx, blockHash)
if block != nil {
uncles := block.Uncles()
if index >= hexutil.Uint(len(uncles)) {
log.Debug("Requested uncle not found", "number", block.Number(), "hash", blockHash, "index", index)
return nil, nil
}
block = types.NewBlockWithHeader(uncles[index])
return s.rpcOutputBlock(block, false, false, ctx)
}
return nil, err
}
// GetUncleCountByBlockNumber returns number of uncles in the block for the given block number
// DEPRECATED SINCE 1.0
func (s *PublicBlockChainAPI) GetUncleCountByBlockNumber(ctx context.Context, blockNr rpc.BlockNumber) *hexutil.Uint {
if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
n := hexutil.Uint(len(block.Uncles()))
return &n
}
return nil
}
// GetUncleCountByBlockHash returns number of uncles in the block for the given block hash
// DEPRECATED SINCE 1.0
func (s *PublicBlockChainAPI) GetUncleCountByBlockHash(ctx context.Context, blockHash common.Hash) *hexutil.Uint {
if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
n := hexutil.Uint(len(block.Uncles()))
return &n
}
return nil
}
// GetCode returns the code stored at the given address in the state for the given block number.
func (s *PublicBlockChainAPI) GetCode(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
if state == nil || err != nil {
return nil, err
}
code := state.GetCode(address)
return code, state.Error()
}
// GetStorageAt returns the storage from the state at the given address, key and
// block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta block
// numbers are also allowed.
func (s *PublicBlockChainAPI) GetStorageAt(ctx context.Context, address common.Address, key string, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
if state == nil || err != nil {
return nil, err
}
res := state.GetState(address, common.HexToHash(key))
return res[:], state.Error()
}
func (s *PublicBlockChainAPI) GetBlockSignersByHash(ctx context.Context, blockHash common.Hash) ([]common.Address, error) {
block, err := s.b.GetBlock(ctx, blockHash)
if err != nil || block == nil {
return []common.Address{}, err
}
masternodes, err := s.GetMasternodes(ctx, block)
if err != nil || len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes))
return []common.Address{}, err
}
return s.rpcOutputBlockSigners(block, ctx, masternodes)
}
func (s *PublicBlockChainAPI) GetBlockSignersByNumber(ctx context.Context, blockNumber rpc.BlockNumber) ([]common.Address, error) {
block, err := s.b.BlockByNumber(ctx, blockNumber)
if err != nil || block == nil {
return []common.Address{}, err
}
masternodes, err := s.GetMasternodes(ctx, block)
if err != nil || len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes))
return []common.Address{}, err
}
return s.rpcOutputBlockSigners(block, ctx, masternodes)
}
func (s *PublicBlockChainAPI) GetBlockFinalityByHash(ctx context.Context, blockHash common.Hash) (uint, error) {
block, err := s.b.GetBlock(ctx, blockHash)
if err != nil || block == nil {
return uint(0), err
}
masternodes, err := s.GetMasternodes(ctx, block)
if err != nil || len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes))
return uint(0), err
}
return s.findFinalityOfBlock(ctx, block, masternodes)
}
func (s *PublicBlockChainAPI) GetBlockFinalityByNumber(ctx context.Context, blockNumber rpc.BlockNumber) (uint, error) {
block, err := s.b.BlockByNumber(ctx, blockNumber)
if err != nil || block == nil {
return uint(0), err
}
masternodes, err := s.GetMasternodes(ctx, block)
if err != nil || len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes))
return uint(0), err
}
return s.findFinalityOfBlock(ctx, block, masternodes)
}
// GetMasternodes returns masternodes set at the starting block of epoch of the given block
func (s *PublicBlockChainAPI) GetMasternodes(ctx context.Context, b *types.Block) ([]common.Address, error) {
var masternodes []common.Address
if b.Number().Int64() >= 0 {
curBlockNumber := b.Number().Uint64()
prevBlockNumber := curBlockNumber + (common.MergeSignRange - (curBlockNumber % common.MergeSignRange))
latestBlockNumber := s.b.CurrentBlock().Number().Uint64()
if prevBlockNumber >= latestBlockNumber || !s.b.ChainConfig().IsTIP2019(b.Number()) {
prevBlockNumber = curBlockNumber
}
if engine, ok := s.b.GetEngine().(*posv.Posv); ok {
// Get block epoc latest.
lastCheckpointNumber := prevBlockNumber - (prevBlockNumber % s.b.ChainConfig().Posv.Epoch)
prevCheckpointBlock, _ := s.b.BlockByNumber(ctx, rpc.BlockNumber(lastCheckpointNumber))
if prevCheckpointBlock != nil {
masternodes = engine.GetMasternodesFromCheckpointHeader(prevCheckpointBlock.Header(), curBlockNumber, s.b.ChainConfig().Posv.Epoch)
}
} else {
log.Error("Undefined POSV consensus engine")
}
}
return masternodes, nil
}
// GetCandidateStatus returns status of the given candidate at a specified epochNumber
func (s *PublicBlockChainAPI) GetCandidateStatus(ctx context.Context, coinbaseAddress common.Address, epoch rpc.EpochNumber) (map[string]interface{}, error) {
var (
block *types.Block
header *types.Header
checkpointNumber rpc.BlockNumber
epochNumber rpc.EpochNumber // if epoch == "latest", print the latest epoch number to epochNumber
masternodes, penaltyList []common.Address
candidates []posv.Masternode
penalties []byte
err error
)
result := map[string]interface{}{
fieldStatus: "",
fieldCapacity: 0,
fieldSuccess: true,
}
epochConfig := s.b.ChainConfig().Posv.Epoch
// checkpoint block
checkpointNumber, epochNumber = s.GetPreviousCheckpointFromEpoch(ctx, epoch)
result[fieldEpoch] = epochNumber.Int64()
block, err = s.b.BlockByNumber(ctx, checkpointNumber)
if err != nil || block == nil { // || checkpointNumber == 0 {
result[fieldSuccess] = false
return result, err
}
header = block.Header()
if header == nil {
log.Error("Empty header at checkpoint ", "num", checkpointNumber)
return result, errEmptyHeader
}
// list of candidates (masternode, slash, propose) at block checkpoint
if epoch == rpc.LatestEpochNumber {
candidates, err = s.getCandidatesFromSmartContract()
} else {
statedb, _, err := s.b.StateAndHeaderByNumber(ctx, checkpointNumber)
if err != nil {
result[fieldSuccess] = false
return result, err
}
candidatesAddresses := state.GetCandidates(statedb)
for _, address := range candidatesAddresses {
v := state.GetCandidateCap(statedb, address)
if address.String() != "0x0000000000000000000000000000000000000000" {
candidates = append(candidates, posv.Masternode{Address: address, Stake: v})
}
}
}
if err != nil || len(candidates) == 0 {
log.Debug("Candidates list cannot be found", "len(candidates)", len(candidates), "err", err)
result[fieldSuccess] = false
return result, err
}
isTopCandidate := false
// check penalties from checkpoint headers and modify status of a node to SLASHED if it's in top 150 candidates
// if it's SLASHED but it's out of top 150, the status should be still PROPOSED
for i := 0; i < len(candidates); i++ {
if coinbaseAddress == candidates[i].Address {
if i < common.MaxMasternodes {
isTopCandidate = true
}
result[fieldStatus] = statusProposed
result[fieldCapacity] = candidates[i].Stake
break
}
}
if !isTopCandidate {
return result, nil
}
// Second, Find candidates that have masternode status
if engine, ok := s.b.GetEngine().(*posv.Posv); ok {
masternodes = engine.GetMasternodesFromCheckpointHeader(header, block.Number().Uint64(), s.b.ChainConfig().Posv.Epoch)
if len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes), "blockNum", header.Number.Uint64())
result[fieldSuccess] = false
return result, err
}
} else {
log.Error("Undefined POSV consensus engine")
}
// Set masternode status
for _, masternode := range masternodes {
if coinbaseAddress == masternode {
result[fieldStatus] = statusMasternode
return result, nil
}
}
// Third, Get penalties list
penalties = append(penalties, header.Penalties...)
// check last 5 epochs to find penalize masternodes
for i := 1; i <= common.LimitPenaltyEpoch; i++ {
if header.Number.Uint64() < epochConfig*uint64(i) {
break
}
blockNum := header.Number.Uint64() - epochConfig*uint64(i)
checkpointHeader, err := s.b.HeaderByNumber(ctx, rpc.BlockNumber(blockNum))
if checkpointHeader == nil || err != nil {
log.Error("Failed to get header by number", "num", blockNum, "err", err)
continue
}
penalties = append(penalties, checkpointHeader.Penalties...)
}
penaltyList = common.ExtractAddressFromBytes(penalties)
// map slashing status
for _, pen := range penaltyList {
if coinbaseAddress == pen {
result[fieldStatus] = statusSlashed
return result, nil
}
}
return result, nil
}
// GetCandidates returns status of all candidates at a specified epochNumber
func (s *PublicBlockChainAPI) GetCandidates(ctx context.Context, epoch rpc.EpochNumber) (map[string]interface{}, error) {
var (
block *types.Block
header *types.Header
checkpointNumber rpc.BlockNumber
epochNumber rpc.EpochNumber
masternodes []common.Address
penaltyList []common.Address
candidates []posv.Masternode
penalties []byte
err error
)
result := map[string]interface{}{
fieldSuccess: true,
}
epochConfig := s.b.ChainConfig().Posv.Epoch
candidatesStatusMap := map[string]map[string]interface{}{}
checkpointNumber, epochNumber = s.GetPreviousCheckpointFromEpoch(ctx, epoch)
result[fieldEpoch] = epochNumber.Int64()
block, err = s.b.BlockByNumber(ctx, checkpointNumber)
if err != nil || block == nil { // || checkpointNumber == 0 {
result[fieldSuccess] = false
return result, err
}
header = block.Header()
if header == nil {
log.Error("Empty header at checkpoint", "num", checkpointNumber)
return result, errEmptyHeader
}
// list of candidates (masternode, slash, propose) at block checkpoint
if epoch == rpc.LatestEpochNumber {
candidates, err = s.getCandidatesFromSmartContract()
} else {
statedb, _, err := s.b.StateAndHeaderByNumber(ctx, checkpointNumber)
if err != nil {
result[fieldSuccess] = false
return result, err
}
candidatesAddresses := state.GetCandidates(statedb)
for _, address := range candidatesAddresses {
v := state.GetCandidateCap(statedb, address)
if address.String() != "0x0000000000000000000000000000000000000000" {
candidates = append(candidates, posv.Masternode{Address: address, Stake: v})
}
}
}
if err != nil || len(candidates) == 0 {
log.Debug("Candidates list cannot be found", "len(candidates)", len(candidates), "err", err)
result[fieldSuccess] = false
return result, err
}
// First, set all candidate to propose
for _, candidate := range candidates {
candidatesStatusMap[candidate.Address.String()] = map[string]interface{}{
fieldStatus: statusProposed,
fieldCapacity: candidate.Stake,
}
}
// Second, Find candidates that have masternode status
if engine, ok := s.b.GetEngine().(*posv.Posv); ok {
masternodes = engine.GetMasternodesFromCheckpointHeader(header, block.Number().Uint64(), s.b.ChainConfig().Posv.Epoch)
if len(masternodes) == 0 {
log.Error("Failed to get masternodes", "err", err, "len(masternodes)", len(masternodes), "blockNum", header.Number.Uint64())
result[fieldSuccess] = false
return result, err
}
} else {
log.Error("Undefined POSV consensus engine")
}
// Set masternode status
for _, masternode := range masternodes {
if candidatesStatusMap[masternode.String()] != nil {
candidatesStatusMap[masternode.String()][fieldStatus] = statusMasternode
}
}
// Third, Get penalties list
penalties = append(penalties, header.Penalties...)
// check last 5 epochs to find penalize masternodes
for i := 1; i <= common.LimitPenaltyEpoch; i++ {
if header.Number.Uint64() < epochConfig*uint64(i) {
break
}
blockNum := header.Number.Uint64() - epochConfig*uint64(i)
checkpointHeader, err := s.b.HeaderByNumber(ctx, rpc.BlockNumber(blockNum))
if checkpointHeader == nil || err != nil {
log.Error("Failed to get header by number", "num", blockNum, "err", err)
continue
}
penalties = append(penalties, checkpointHeader.Penalties...)
}
// map slashing status
if len(penalties) == 0 {
result[fieldCandidates] = candidatesStatusMap
return result, nil
}
penaltyList = common.ExtractAddressFromBytes(penalties)
var topCandidates []posv.Masternode
if len(candidates) > common.MaxMasternodes {
topCandidates = candidates[:common.MaxMasternodes]
} else {
topCandidates = candidates
}
// check penalties from checkpoint headers and modify status of a node to SLASHED if it's in top 150 candidates
// if it's SLASHED but it's out of top 150, the status should be still PROPOSED
for _, pen := range penaltyList {
for _, candidate := range topCandidates {
if candidate.Address == pen && candidatesStatusMap[pen.String()] != nil {
candidatesStatusMap[pen.String()][fieldStatus] = statusSlashed
}
penalties = append(penalties, block.Penalties()...)
}
}
// update result
result[fieldCandidates] = candidatesStatusMap
return result, nil
}
// GetPreviousCheckpointFromEpoch returns header of the previous checkpoint
func (s *PublicBlockChainAPI) GetPreviousCheckpointFromEpoch(ctx context.Context, epochNum rpc.EpochNumber) (rpc.BlockNumber, rpc.EpochNumber) {
var checkpointNumber uint64
epoch := s.b.ChainConfig().Posv.Epoch
if epochNum == rpc.LatestEpochNumber {
blockNumer := s.b.CurrentBlock().Number().Uint64()
diff := blockNumer % epoch
// checkpoint number
checkpointNumber = blockNumer - diff
epochNum = rpc.EpochNumber(checkpointNumber / epoch)
if diff > 0 {
epochNum += 1
}
} else if epochNum < 2 {
checkpointNumber = 0
} else {
checkpointNumber = epoch * (uint64(epochNum) - 1)
}
return rpc.BlockNumber(checkpointNumber), epochNum
}
// getCandidatesFromSmartContract returns all candidates with their capacities at the current time
func (s *PublicBlockChainAPI) getCandidatesFromSmartContract() ([]posv.Masternode, error) {
client, err := s.b.GetIPCClient()
if err != nil {
return []posv.Masternode{}, err
}
addr := common.HexToAddress(common.MasternodeVotingSMC)
validator, err := contractValidator.NewFandomValidator(addr, client)
if err != nil {
return []posv.Masternode{}, err
}
opts := new(bind.CallOpts)
candidates, err := validator.GetCandidates(opts)
if err != nil {
return []posv.Masternode{}, err
}
var candidatesWithStakeInfo []posv.Masternode
for _, candidate := range candidates {
v, err := validator.GetCandidateCap(opts, candidate)
if err != nil {
return []posv.Masternode{}, err