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package core
import (
"errors"
"fmt"
"sync"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
)
var (
txplogger = logger.NewLogger("TXP")
ErrInvalidSender = errors.New("Invalid sender")
)
const txPoolQueueSize = 50
type TxPoolHook chan *types.Transaction
type TxMsg struct {
Tx *types.Transaction
}
const (
minGasPrice = 1000000
)
type TxProcessor interface {
ProcessTransaction(tx *types.Transaction)
}
// The tx pool a thread safe transaction pool handler. In order to
// guarantee a non blocking pool we use a queue channel which can be
// independently read without needing access to the actual pool.
type TxPool struct {
mu sync.RWMutex
// Queueing channel for reading and writing incoming
// transactions to
queueChan chan *types.Transaction
// Quiting channel
quit chan bool
// The actual pool
//pool *list.List
txs map[string]*types.Transaction
SecondaryProcessor TxProcessor
subscribers []chan TxMsg
eventMux *event.TypeMux
}
func NewTxPool(eventMux *event.TypeMux) *TxPool {
return &TxPool{
txs: make(map[string]*types.Transaction),
queueChan: make(chan *types.Transaction, txPoolQueueSize),
quit: make(chan bool),
eventMux: eventMux,
}
}
func (pool *TxPool) ValidateTransaction(tx *types.Transaction) error {
if len(tx.To()) != 0 && len(tx.To()) != 20 {
return fmt.Errorf("Invalid recipient. len = %d", len(tx.To()))
}
// Validate curve param
v, _, _ := tx.Curve()
if v > 28 || v < 27 {
return fmt.Errorf("tx.v != (28 || 27) => %v", v)
}
// Validate sender address
senderAddr := tx.From()
if senderAddr == nil || len(senderAddr) != 20 {
return ErrInvalidSender
}
/* XXX this kind of validation needs to happen elsewhere in the gui when sending txs.
Other clients should do their own validation. Value transfer could throw error
but doesn't necessarily invalidate the tx. Gas can still be payed for and miner
can still be rewarded for their inclusion and processing.
sender := pool.stateQuery.GetAccount(senderAddr)
totAmount := new(big.Int).Set(tx.Value())
// Make sure there's enough in the sender's account. Having insufficient
// funds won't invalidate this transaction but simple ignores it.
if sender.Balance().Cmp(totAmount) < 0 {
return fmt.Errorf("Insufficient amount in sender's (%x) account", tx.From())
}
*/
return nil
}
func (self *TxPool) addTx(tx *types.Transaction) {
self.txs[string(tx.Hash())] = tx
}
func (self *TxPool) add(tx *types.Transaction) error {
if self.txs[string(tx.Hash())] != nil {
return fmt.Errorf("Known transaction (%x)", tx.Hash()[0:4])
}
err := self.ValidateTransaction(tx)
if err != nil {
return err
}
self.addTx(tx)
var to string
if len(tx.To()) > 0 {
to = common.Bytes2Hex(tx.To()[:4])
} else {
to = "[NEW_CONTRACT]"
}
var from string
if len(tx.From()) > 0 {
from = common.Bytes2Hex(tx.From()[:4])
} else {
return errors.New(fmt.Sprintf("FROM ADDRESS MUST BE POSITIVE (was %v)", tx.From()))
}
txplogger.Debugf("(t) %x => %s (%v) %x\n", from, to, tx.Value, tx.Hash())
// Notify the subscribers
go self.eventMux.Post(TxPreEvent{tx})
return nil
}
func (self *TxPool) Size() int {
return len(self.txs)
}
func (self *TxPool) Add(tx *types.Transaction) error {
self.mu.Lock()
defer self.mu.Unlock()
return self.add(tx)
}
func (self *TxPool) AddTransactions(txs []*types.Transaction) {
self.mu.Lock()
defer self.mu.Unlock()
for _, tx := range txs {
if err := self.add(tx); err != nil {
txplogger.Debugln(err)
} else {
txplogger.Debugf("tx %x\n", tx.Hash()[0:4])
}
}
}
func (self *TxPool) GetTransactions() (txs types.Transactions) {
self.mu.RLock()
defer self.mu.RUnlock()
txs = make(types.Transactions, self.Size())
i := 0
for _, tx := range self.txs {
txs[i] = tx
i++
}
return
}
func (pool *TxPool) RemoveInvalid(query StateQuery) {
pool.mu.Lock()
var removedTxs types.Transactions
for _, tx := range pool.txs {
sender := query.GetAccount(tx.From())
err := pool.ValidateTransaction(tx)
if err != nil || sender.Nonce() >= tx.Nonce() {
removedTxs = append(removedTxs, tx)
}
}
pool.mu.Unlock()
pool.RemoveSet(removedTxs)
}
func (self *TxPool) RemoveSet(txs types.Transactions) {
self.mu.Lock()
defer self.mu.Unlock()
for _, tx := range txs {
delete(self.txs, string(tx.Hash()))
}
}
func (pool *TxPool) Flush() {
pool.txs = make(map[string]*types.Transaction)
}
func (pool *TxPool) Start() {
}
func (pool *TxPool) Stop() {
pool.Flush()
txplogger.Infoln("Stopped")
}
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