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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 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 library. If not, see
// <http://www.gnu.org/licenses/>.
package simulation
import (
"encoding/json"
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus/common"
"github.com/dexon-foundation/dexon-consensus/core"
"github.com/dexon-foundation/dexon-consensus/core/blockdb"
"github.com/dexon-foundation/dexon-consensus/core/crypto"
"github.com/dexon-foundation/dexon-consensus/core/test"
"github.com/dexon-foundation/dexon-consensus/core/types"
"github.com/dexon-foundation/dexon-consensus/simulation/config"
)
type infoStatus string
const (
statusInit infoStatus = "init"
statusNormal infoStatus = "normal"
statusShutdown infoStatus = "shutdown"
)
type messageType string
const (
shutdownAck messageType = "shutdownAck"
blockTimestamp messageType = "blockTimestamps"
)
// message is a struct for peer sending message to server.
type message struct {
Type messageType `json:"type"`
Payload json.RawMessage `json:"payload"`
}
// node represents a node in DexCon.
type node struct {
app core.Application
db blockdb.BlockDatabase
gov *test.Governance
netModule *test.Network
ID types.NodeID
prvKey crypto.PrivateKey
consensus *core.Consensus
}
// newNode returns a new empty node.
func newNode(
prvKey crypto.PrivateKey,
config config.Config) *node {
pubKey := prvKey.PublicKey()
netModule := test.NewNetwork(
pubKey,
&test.NormalLatencyModel{
Mean: config.Networking.Mean,
Sigma: config.Networking.Sigma,
},
test.NewDefaultMarshaller(&jsonMarshaller{}),
test.NetworkConfig{
Type: config.Networking.Type,
PeerServer: config.Networking.PeerServer,
PeerPort: peerPort,
})
id := types.NewNodeID(pubKey)
db, err := blockdb.NewMemBackedBlockDB(id.String() + ".blockdb")
if err != nil {
panic(err)
}
// Sync config to state in governance.
cConfig := config.Node.Consensus
gov, err := test.NewGovernance([]crypto.PublicKey{pubKey}, time.Millisecond)
if err != nil {
panic(err)
}
gov.State().RequestChange(test.StateChangeK, cConfig.K)
gov.State().RequestChange(test.StateChangePhiRatio, cConfig.PhiRatio)
gov.State().RequestChange(test.StateChangeNumChains, cConfig.ChainNum)
gov.State().RequestChange(
test.StateChangeNotarySetSize, cConfig.NotarySetSize)
gov.State().RequestChange(test.StateChangeDKGSetSize, cConfig.DKGSetSize)
gov.State().RequestChange(test.StateChangeLambdaBA, time.Duration(
cConfig.LambdaBA)*time.Millisecond)
gov.State().RequestChange(test.StateChangeLambdaDKG, time.Duration(
cConfig.LambdaDKG)*time.Millisecond)
gov.State().RequestChange(test.StateChangeRoundInterval, time.Duration(
cConfig.RoundInterval)*time.Millisecond)
gov.State().RequestChange(
test.StateChangeMinBlockInterval,
3*time.Duration(cConfig.LambdaBA)*time.Millisecond)
gov.State().ProposeCRS(0, crypto.Keccak256Hash([]byte(cConfig.GenesisCRS)))
return &node{
ID: id,
prvKey: prvKey,
app: newSimApp(id, netModule, gov.State()),
gov: gov,
db: db,
netModule: netModule,
}
}
// GetID returns the ID of node.
func (n *node) GetID() types.NodeID {
return n.ID
}
// run starts the node.
func (n *node) run(serverEndpoint interface{}, dMoment time.Time) {
// Run network.
if err := n.netModule.Setup(serverEndpoint); err != nil {
panic(err)
}
msgChannel := n.netModule.ReceiveChanForNode()
peers := n.netModule.Peers()
go n.netModule.Run()
// Run consensus.
hashes := make(common.Hashes, 0, len(peers))
for _, pubKey := range peers {
nID := types.NewNodeID(pubKey)
n.gov.State().RequestChange(test.StateAddNode, pubKey)
hashes = append(hashes, nID.Hash)
}
// Setup of governance is ready, can be switched to remote mode.
n.gov.SwitchToRemoteMode(n.netModule)
// Setup Consensus.
n.consensus = core.NewConsensus(
dMoment,
n.app,
n.gov,
n.db,
n.netModule,
n.prvKey,
&common.SimpleLogger{})
go n.consensus.Run(&types.Block{})
// Blocks forever.
MainLoop:
for {
msg := <-msgChannel
switch val := msg.(type) {
case infoStatus:
if val == statusShutdown {
break MainLoop
}
default:
panic(fmt.Errorf("unexpected message from server: %v", val))
}
}
// Cleanup.
n.consensus.Stop()
if err := n.db.Close(); err != nil {
fmt.Println(err)
}
n.netModule.Report(&message{
Type: shutdownAck,
})
// TODO(mission): once we have a way to know if consensus is stopped, stop
// the network module.
return
}
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