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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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 dexon-consensus-core 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 dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package simulation
import (
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus-core/blockdb"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon-consensus-core/simulation/config"
)
// Validator represents a validator in DexCon.
type Validator struct {
network Network
app *SimApp
gov *simGov
db blockdb.BlockDatabase
config config.Validator
msgChannel chan interface{}
isFinished chan struct{}
ID types.ValidatorID
consensus *core.Consensus
compactionChain *core.BlockChain
genesis *types.Block
current *types.Block
}
// NewValidator returns a new empty validator.
func NewValidator(
id types.ValidatorID,
config config.Validator,
network Network) *Validator {
db, err := blockdb.NewMemBackedBlockDB(
id.String() + ".blockdb")
if err != nil {
panic(err)
}
return &Validator{
ID: id,
config: config,
network: network,
app: NewSimApp(id, network),
gov: newSimGov(config.Num),
db: db,
isFinished: make(chan struct{}),
}
}
// GetID returns the ID of validator.
func (v *Validator) GetID() types.ValidatorID {
return v.ID
}
// Run starts the validator.
func (v *Validator) Run() {
v.msgChannel = v.network.Join(v)
isStopped := make(chan struct{})
isShutdown := make(chan struct{})
v.BroadcastGenesisBlock()
go v.MsgServer()
go v.CheckServerInfo(isShutdown)
go v.BlockProposer(isStopped, isShutdown)
// Blocks forever.
<-isStopped
if err := v.db.Close(); err != nil {
fmt.Println(err)
}
v.network.NotifyServer(Message{
Type: shutdownAck,
})
v.isFinished <- struct{}{}
}
// Wait for the validator to stop (if peerServer told it to).
func (v *Validator) Wait() {
<-v.isFinished
}
// CheckServerInfo will check the info from the peerServer and update
// validator's status if needed.
func (v *Validator) CheckServerInfo(isShutdown chan struct{}) {
for {
infoMsg := v.network.GetServerInfo()
if infoMsg.Status == statusShutdown {
isShutdown <- struct{}{}
break
}
time.Sleep(250 * time.Millisecond)
}
}
// MsgServer listen to the network channel for message and handle it.
func (v *Validator) MsgServer() {
var pendingBlocks []*types.Block
for {
msg := <-v.msgChannel
switch val := msg.(type) {
case *types.Block:
if v.consensus != nil {
if err := v.consensus.ProcessBlock(val); err != nil {
fmt.Println(err)
//panic(err)
}
} else {
pendingBlocks = append(pendingBlocks, val)
if val.ParentHash == val.Hash {
v.gov.addValidator(val.ProposerID)
}
validatorSet := v.gov.GetValidatorSet()
if len(validatorSet) != v.config.Num {
// We don't collect all validators yet.
break
}
v.consensus = core.NewConsensus(v.app, v.gov, v.db)
for _, b := range pendingBlocks {
if err := v.consensus.ProcessBlock(b); err != nil {
fmt.Println(err)
//panic(err)
}
}
pendingBlocks = pendingBlocks[:0]
}
}
}
}
// BroadcastGenesisBlock broadcasts genesis block to all peers.
func (v *Validator) BroadcastGenesisBlock() {
// Wait until all peer joined the network.
for v.network.NumPeers() != v.config.Num {
time.Sleep(time.Second)
}
hash := common.NewRandomHash()
b := &types.Block{
ProposerID: v.ID,
ParentHash: hash,
Hash: hash,
Height: 0,
Acks: map[common.Hash]struct{}{},
Timestamps: map[types.ValidatorID]time.Time{
v.ID: time.Now().UTC(),
},
}
v.network.BroadcastBlock(b)
}
// BlockProposer propose blocks to be send to the DEXON network.
func (v *Validator) BlockProposer(isStopped, isShutdown chan struct{}) {
// Wait until all genesis blocks are received.
for v.consensus == nil {
time.Sleep(time.Second)
}
model := &NormalNetwork{
Sigma: v.config.ProposeIntervalSigma,
Mean: v.config.ProposeIntervalMean,
}
ProposingBlockLoop:
for {
time.Sleep(model.Delay())
block := &types.Block{
ProposerID: v.ID,
Hash: common.NewRandomHash(),
}
if err := v.consensus.PrepareBlock(block); err != nil {
panic(err)
}
if err := v.consensus.ProcessBlock(block); err != nil {
fmt.Println(err)
//panic(err)
}
v.network.BroadcastBlock(block)
select {
case <-isShutdown:
isStopped <- struct{}{}
break ProposingBlockLoop
default:
break
}
}
}
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