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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 (
"time"
"github.com/syndtr/goleveldb/leveldb"
"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 core.Network
app *SimApp
config config.Validator
db *leveldb.DB
msgChannel chan interface{}
ID types.ValidatorID
lattice *core.BlockLattice
compactionChain *core.BlockChain
genesis *types.Block
current *types.Block
}
// NewValidator returns a new empty validator.
func NewValidator(
id types.ValidatorID,
config config.Validator,
network core.Network,
db *leveldb.DB) *Validator {
hash := common.NewRandomHash()
genesis := &types.Block{
ProposerID: id,
ParentHash: hash,
Hash: hash,
Height: 0,
Acks: map[common.Hash]struct{}{},
}
app := NewSimApp(id)
lattice := core.NewBlockLattice(blockdb.NewMemBackedBlockDB(), network, app)
return &Validator{
ID: id,
config: config,
network: network,
app: app,
db: db,
lattice: lattice,
genesis: genesis,
current: genesis,
}
}
// GetID returns the ID of validator.
func (v *Validator) GetID() types.ValidatorID {
return v.ID
}
// Bootstrap bootstraps a validator.
func (v *Validator) Bootstrap(vs []*Validator) {
for _, x := range vs {
v.lattice.AddValidator(x.ID, x.genesis)
}
v.lattice.SetOwner(v.ID)
}
// Run starts the validator.
func (v *Validator) Run() {
v.msgChannel = v.network.Join(v)
go v.MsgServer()
go v.BlockProposer()
// Blocks forever.
select {}
}
// MsgServer listen to the network channel for message and handle it.
func (v *Validator) MsgServer() {
for {
msg := <-v.msgChannel
switch val := msg.(type) {
case *types.Block:
//if val.ProposerID.Equal(v.ID) {
// continue
//}
v.lattice.ProcessBlock(val, true)
}
}
}
// BlockProposer propose blocks to be send to the DEXON network.
func (v *Validator) BlockProposer() {
model := &NormalNetwork{
Sigma: v.config.ProposeIntervalSigma,
Mean: v.config.ProposeIntervalMean,
}
for {
time.Sleep(model.Delay())
block := &types.Block{
ProposerID: v.ID,
ParentHash: v.current.Hash,
Hash: common.NewRandomHash(),
Height: v.current.Height + 1.,
Acks: map[common.Hash]struct{}{},
}
v.current = block
v.lattice.ProposeBlock(block)
}
}
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