Esempio n. 1
0
// GetBalance returns the amount of wei for the given address in the state of the given block number.
// When block number equals rpc.LatestBlockNumber the current block is used.
func (s *PublicBlockChainAPI) GetBalance(address common.Address, blockNr rpc.BlockNumber) (*big.Int, error) {
	block := blockByNumber(s.miner, s.bc, blockNr)
	if block == nil {
		return nil, nil
	}

	state, err := state.New(block.Root(), s.chainDb)
	if err != nil {
		return nil, err
	}
	return state.GetBalance(address), nil
}
Esempio n. 2
0
// validatePool removes invalid and processed transactions from the main pool.
// If a transaction is removed for being invalid (e.g. out of funds), all sub-
// sequent (Still valid) transactions are moved back into the future queue. This
// is important to prevent a drained account from DOSing the network with non
// executable transactions.
func (pool *TxPool) validatePool() {
	state, err := pool.currentState()
	if err != nil {
		glog.V(logger.Info).Infoln("failed to get current state: %v", err)
		return
	}
	balanceCache := make(map[common.Address]*big.Int)

	// Clean up the pending pool, accumulating invalid nonces
	gaps := make(map[common.Address]uint64)

	for hash, tx := range pool.pending {
		sender, _ := tx.From() // err already checked

		// Perform light nonce and balance validation
		balance := balanceCache[sender]
		if balance == nil {
			balance = state.GetBalance(sender)
			balanceCache[sender] = balance
		}
		if past := state.GetNonce(sender) > tx.Nonce(); past || balance.Cmp(tx.Cost()) < 0 {
			// Remove an already past it invalidated transaction
			if glog.V(logger.Core) {
				glog.Infof("removed tx (%v) from pool: low tx nonce or out of funds\n", tx)
			}
			delete(pool.pending, hash)

			// Track the smallest invalid nonce to postpone subsequent transactions
			if !past {
				if prev, ok := gaps[sender]; !ok || tx.Nonce() < prev {
					gaps[sender] = tx.Nonce()
				}
			}
		}
	}
	// Move all transactions after a gap back to the future queue
	if len(gaps) > 0 {
		for hash, tx := range pool.pending {
			sender, _ := tx.From()
			if gap, ok := gaps[sender]; ok && tx.Nonce() >= gap {
				if glog.V(logger.Core) {
					glog.Infof("postponed tx (%v) due to introduced gap\n", tx)
				}
				pool.queueTx(hash, tx)
				delete(pool.pending, hash)
			}
		}
	}
}