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processor.go
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/
processor.go
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// Copyright 2018 The Fractal Team Authors
// This file is part of the fractal project.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package dpos
import (
"fmt"
"math/big"
"strings"
"github.com/fractalplatform/fractal/accountmanager"
"github.com/fractalplatform/fractal/utils/rlp"
"github.com/fractalplatform/fractal/params"
"github.com/fractalplatform/fractal/state"
"github.com/fractalplatform/fractal/types"
)
// RegisterCandidate candidate info
type RegisterCandidate struct {
URL string
}
// UpdateCandidate candidate info
type UpdateCandidate struct {
URL string
}
// VoteCandidate vote info
type VoteCandidate struct {
Candidate string
Stake *big.Int
}
// KickedCandidate kicked info
type KickedCandidate struct {
Candidates []string
}
// ProcessAction exec action
func (dpos *Dpos) ProcessAction(height uint64, chainCfg *params.ChainConfig, state *state.StateDB, action *types.Action) ([]*types.InternalAction, error) {
snap := state.Snapshot()
internalLogs, err := dpos.processAction(height, chainCfg, state, action)
if err != nil {
state.RevertToSnapshot(snap)
}
return internalLogs, err
}
func (dpos *Dpos) processAction(height uint64, chainCfg *params.ChainConfig, state *state.StateDB, action *types.Action) ([]*types.InternalAction, error) {
if err := action.CheckValid(chainCfg); err != nil {
return nil, err
}
sys := NewSystem(state, dpos.config)
if action.Value().Cmp(big.NewInt(0)) > 0 {
accountDB, err := accountmanager.NewAccountManager(state)
if err != nil {
return nil, err
}
if err := accountDB.TransferAsset(action.Sender(), action.Recipient(), action.AssetID(), action.Value()); err != nil {
return nil, err
}
}
epcho, err := sys.GetLastestEpcho()
if err != nil {
return nil, err
}
switch action.Type() {
case types.RegCandidate:
arg := &RegisterCandidate{}
if err := rlp.DecodeBytes(action.Data(), &arg); err != nil {
return nil, err
}
if err := sys.RegCandidate(epcho, action.Sender().String(), arg.URL, action.Value(), height); err != nil {
return nil, err
}
case types.UpdateCandidate:
arg := &UpdateCandidate{}
if err := rlp.DecodeBytes(action.Data(), &arg); err != nil {
return nil, err
}
if err := sys.UpdateCandidate(epcho, action.Sender().String(), arg.URL, action.Value(), height); err != nil {
return nil, err
}
case types.UnregCandidate:
err := sys.UnregCandidate(epcho, action.Sender().String(), height)
if err != nil {
return nil, err
}
case types.RefundCandidate:
err := sys.RefundCandidate(epcho, action.Sender().String(), height)
if err != nil {
return nil, err
}
case types.VoteCandidate:
arg := &VoteCandidate{}
if err := rlp.DecodeBytes(action.Data(), &arg); err != nil {
return nil, err
}
if err := sys.VoteCandidate(epcho, action.Sender().String(), arg.Candidate, arg.Stake, height); err != nil {
return nil, err
}
case types.KickedCandidate:
if strings.Compare(action.Sender().String(), dpos.config.SystemName) != 0 {
return nil, fmt.Errorf("no permission for kicking candidates")
}
arg := &KickedCandidate{}
if err := rlp.DecodeBytes(action.Data(), &arg); err != nil {
return nil, err
}
for _, cadicate := range arg.Candidates {
if err := sys.KickedCandidate(epcho, cadicate, height); err != nil {
return nil, err
}
}
case types.ExitTakeOver:
if strings.Compare(action.Sender().String(), dpos.config.SystemName) != 0 {
return nil, fmt.Errorf("no permission for exit take over")
}
if err := sys.ExitTakeOver(epcho); err != nil {
return nil, err
}
default:
return nil, accountmanager.ErrUnkownTxType
}
return sys.internalActions, nil
}