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transfer.go
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transfer.go
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// Copyright (c) 2018 IoTeX
// This is an alpha (internal) release and is not suitable for production. This source code is provided 'as is' and no
// warranties are given as to title or non-infringement, merchantability or fitness for purpose and, to the extent
// permitted by law, all liability for your use of the code is disclaimed. This source code is governed by Apache
// License 2.0 that can be found in the LICENSE file.
package account
import (
"context"
"math/big"
"github.com/pkg/errors"
"github.com/iotexproject/iotex-address/address"
"github.com/iotexproject/iotex-core/action"
"github.com/iotexproject/iotex-core/action/protocol"
accountutil "github.com/iotexproject/iotex-core/action/protocol/account/util"
"github.com/iotexproject/iotex-core/action/protocol/rewarding"
"github.com/iotexproject/iotex-core/action/protocol/vote/candidatesutil"
"github.com/iotexproject/iotex-core/pkg/hash"
"github.com/iotexproject/iotex-core/state"
)
// TransferSizeLimit is the maximum size of transfer allowed
const TransferSizeLimit = 32 * 1024
// handleTransfer handles a transfer
func (p *Protocol) handleTransfer(ctx context.Context, act action.Action, sm protocol.StateManager) (*action.Receipt, error) {
raCtx := protocol.MustGetRunActionsCtx(ctx)
tsf, ok := act.(*action.Transfer)
if !ok {
return nil, nil
}
// check sender
sender, err := accountutil.LoadOrCreateAccount(sm, raCtx.Caller.String(), big.NewInt(0))
if err != nil {
return nil, errors.Wrapf(err, "failed to load or create the account of sender %s", raCtx.Caller.String())
}
if raCtx.GasLimit < raCtx.IntrinsicGas {
return nil, action.ErrHitGasLimit
}
gasFee := big.NewInt(0).Mul(tsf.GasPrice(), big.NewInt(0).SetUint64(raCtx.IntrinsicGas))
if big.NewInt(0).Add(tsf.Amount(), gasFee).Cmp(sender.Balance) == 1 {
return nil, errors.Wrapf(
state.ErrNotEnoughBalance,
"sender %s balance %s, required amount %s",
raCtx.Caller.String(),
sender.Balance,
big.NewInt(0).Add(tsf.Amount(), gasFee),
)
}
// charge sender gas
if err := sender.SubBalance(gasFee); err != nil {
return nil, errors.Wrapf(err, "failed to charge the gas for sender %s", raCtx.Caller.String())
}
if err := rewarding.DepositGas(ctx, sm, gasFee, raCtx.Registry); err != nil {
return nil, err
}
recipientAddr, err := address.FromString(tsf.Recipient())
if err != nil {
return nil, errors.Wrapf(err, "failed to decode recipient address %s", tsf.Recipient())
}
recipientAcct, err := accountutil.LoadAccount(sm, hash.BytesToHash160(recipientAddr.Bytes()))
if err == nil && recipientAcct.IsContract() {
// update sender Nonce
accountutil.SetNonce(tsf, sender)
// put updated sender's state to trie
if err := accountutil.StoreAccount(sm, raCtx.Caller.String(), sender); err != nil {
return nil, errors.Wrap(err, "failed to update pending account changes to trie")
}
return &action.Receipt{
Status: action.FailureReceiptStatus,
BlockHeight: raCtx.BlockHeight,
ActionHash: raCtx.ActionHash,
GasConsumed: raCtx.IntrinsicGas,
ContractAddress: p.addr.String(),
}, nil
}
if tsf.Amount().Cmp(sender.Balance) == 1 {
return nil, errors.Wrapf(
state.ErrNotEnoughBalance,
"failed to verify the Balance of sender %s",
raCtx.Caller.String(),
)
}
// update sender Balance
if err := sender.SubBalance(tsf.Amount()); err != nil {
return nil, errors.Wrapf(err, "failed to update the Balance of sender %s", raCtx.Caller.String())
}
// update sender Nonce
accountutil.SetNonce(tsf, sender)
// put updated sender's state to trie
if err := accountutil.StoreAccount(sm, raCtx.Caller.String(), sender); err != nil {
return nil, errors.Wrap(err, "failed to update pending account changes to trie")
}
// Update sender votes
if len(sender.Votee) > 0 {
// sender already voted to a different person
voteeOfSender, err := accountutil.LoadOrCreateAccount(sm, sender.Votee, big.NewInt(0))
if err != nil {
return nil, errors.Wrapf(err, "failed to load or create the account of sender's votee %s", sender.Votee)
}
voteeOfSender.VotingWeight.Sub(voteeOfSender.VotingWeight, tsf.Amount())
// put updated state of sender's votee to trie
if err := accountutil.StoreAccount(sm, sender.Votee, voteeOfSender); err != nil {
return nil, errors.Wrap(err, "failed to update pending account changes to trie")
}
// Update candidate
if voteeOfSender.IsCandidate {
if err := candidatesutil.LoadAndUpdateCandidates(sm, raCtx.BlockHeight, sender.Votee, voteeOfSender.VotingWeight); err != nil {
return nil, errors.Wrap(err, "failed to load and update candidates")
}
}
}
// check recipient
recipient, err := accountutil.LoadOrCreateAccount(sm, tsf.Recipient(), big.NewInt(0))
if err != nil {
return nil, errors.Wrapf(err, "failed to load or create the account of recipient %s", tsf.Recipient())
}
if err := recipient.AddBalance(tsf.Amount()); err != nil {
return nil, errors.Wrapf(err, "failed to update the Balance of recipient %s", tsf.Recipient())
}
// put updated recipient's state to trie
if err := accountutil.StoreAccount(sm, tsf.Recipient(), recipient); err != nil {
return nil, errors.Wrap(err, "failed to update pending account changes to trie")
}
// Update recipient votes
if len(recipient.Votee) > 0 {
// recipient already voted to a different person
voteeOfRecipient, err := accountutil.LoadOrCreateAccount(sm, recipient.Votee, big.NewInt(0))
if err != nil {
return nil, errors.Wrapf(err, "failed to load or create the account of recipient's votee %s", recipient.Votee)
}
voteeOfRecipient.VotingWeight.Add(voteeOfRecipient.VotingWeight, tsf.Amount())
// put updated state of recipient's votee to trie
if err := accountutil.StoreAccount(sm, recipient.Votee, voteeOfRecipient); err != nil {
return nil, errors.Wrap(err, "failed to update pending account changes to trie")
}
if voteeOfRecipient.IsCandidate {
if err := candidatesutil.LoadAndUpdateCandidates(sm, raCtx.BlockHeight, recipient.Votee, voteeOfRecipient.VotingWeight); err != nil {
return nil, errors.Wrap(err, "failed to load and update candidates")
}
}
}
return &action.Receipt{
Status: action.SuccessReceiptStatus,
BlockHeight: raCtx.BlockHeight,
ActionHash: raCtx.ActionHash,
GasConsumed: raCtx.IntrinsicGas,
ContractAddress: p.addr.String(),
}, nil
}
// validateTransfer validates a transfer
func (p *Protocol) validateTransfer(_ context.Context, act action.Action) error {
tsf, ok := act.(*action.Transfer)
if !ok {
return nil
}
// Reject oversized transfer
if tsf.TotalSize() > TransferSizeLimit {
return errors.Wrap(action.ErrActPool, "oversized data")
}
// Reject transfer of negative amount
if tsf.Amount().Sign() < 0 {
return errors.Wrap(action.ErrBalance, "negative value")
}
// Reject transfer of negative gas price
if tsf.GasPrice().Sign() < 0 {
return errors.Wrap(action.ErrGasPrice, "negative value")
}
// check if recipient's address is valid
if _, err := address.FromString(tsf.Recipient()); err != nil {
return errors.Wrapf(err, "error when validating recipient's address %s", tsf.Recipient())
}
return nil
}