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// Copyright 2019 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 integration
import (
"context"
"fmt"
"sync"
"testing"
"time"
"github.com/dexon-foundation/dexon-consensus/common"
"github.com/dexon-foundation/dexon-consensus/core"
"github.com/dexon-foundation/dexon-consensus/core/crypto"
"github.com/dexon-foundation/dexon-consensus/core/db"
"github.com/dexon-foundation/dexon-consensus/core/test"
"github.com/dexon-foundation/dexon-consensus/core/types"
"github.com/dexon-foundation/dexon-consensus/core/utils"
"github.com/stretchr/testify/suite"
)
// There is no scheduler in these tests, we need to wait a long period to make
// sure these tests are ok.
type ByzantineTestSuite struct {
suite.Suite
directLatencyModel map[types.NodeID]test.LatencyModel
}
func (s *ByzantineTestSuite) SetupTest() {
s.directLatencyModel = make(map[types.NodeID]test.LatencyModel)
}
func (s *ByzantineTestSuite) setupNodes(
dMoment time.Time,
prvKeys []crypto.PrivateKey,
seedGov *test.Governance) map[types.NodeID]*node {
var (
wg sync.WaitGroup
)
// Setup peer server at transport layer.
server := test.NewFakeTransportServer()
serverChannel, err := server.Host()
s.Require().NoError(err)
// setup nodes.
nodes := make(map[types.NodeID]*node)
wg.Add(len(prvKeys))
for _, k := range prvKeys {
dbInst, err := db.NewMemBackedDB()
s.Require().NoError(err)
nID := types.NewNodeID(k.PublicKey())
// Prepare essential modules: app, gov, db.
var directLatencyModel test.LatencyModel
if model, exist := s.directLatencyModel[nID]; exist {
directLatencyModel = model
} else {
directLatencyModel = &test.FixedLatencyModel{}
}
networkModule := test.NewNetwork(k.PublicKey(), test.NetworkConfig{
Type: test.NetworkTypeFake,
DirectLatency: directLatencyModel,
GossipLatency: &test.FixedLatencyModel{},
Marshaller: test.NewDefaultMarshaller(nil)},
)
gov := seedGov.Clone()
gov.SwitchToRemoteMode(networkModule)
gov.NotifyRound(0)
networkModule.AddNodeSetCache(utils.NewNodeSetCache(gov))
app := test.NewApp(1, gov, nil)
nodes[nID] = &node{nID, nil, app, gov, dbInst, networkModule}
go func() {
defer wg.Done()
s.Require().NoError(networkModule.Setup(serverChannel))
go networkModule.Run()
}()
}
// Make sure transport layer is ready.
s.Require().NoError(server.WaitForPeers(uint32(len(prvKeys))))
wg.Wait()
for _, k := range prvKeys {
node := nodes[types.NewNodeID(k.PublicKey())]
// Now is the consensus module.
node.con = core.NewConsensus(
dMoment,
node.app,
node.gov,
node.db,
node.network,
k,
&common.NullLogger{},
)
}
return nodes
}
func (s *ByzantineTestSuite) verifyNodes(nodes map[types.NodeID]*node) {
for ID, node := range nodes {
s.Require().NoError(test.VerifyDB(node.db))
s.Require().NoError(node.app.Verify())
for otherID, otherNode := range nodes {
if ID == otherID {
continue
}
s.Require().NoError(node.app.Compare(otherNode.app))
}
}
}
func (s *ByzantineTestSuite) TestOneSlowNodeOneDeadNode() {
// 4 nodes setup with one slow node and one dead node.
// The network of slow node is very slow.
var (
req = s.Require()
peerCount = 4
dMoment = time.Now().UTC()
untilRound = uint64(3)
)
if testing.Short() {
untilRound = 1
}
prvKeys, pubKeys, err := test.NewKeys(peerCount)
req.NoError(err)
// Setup seed governance instance. Give a short latency to make this test
// run faster.
lambda := 100 * time.Millisecond
seedGov, err := test.NewGovernance(
test.NewState(core.DKGDelayRound,
pubKeys, lambda, &common.NullLogger{}, true),
core.ConfigRoundShift)
req.NoError(err)
req.NoError(seedGov.State().RequestChange(
test.StateChangeRoundLength, uint64(60)))
slowNodeID := types.NewNodeID(pubKeys[0])
deadNodeID := types.NewNodeID(pubKeys[1])
s.directLatencyModel[slowNodeID] = &test.FixedLatencyModel{
Latency: lambda.Seconds() * 1000 * 2,
}
nodes := s.setupNodes(dMoment, prvKeys, seedGov)
for _, n := range nodes {
if n.ID == deadNodeID {
continue
}
go n.con.Run()
defer n.con.Stop()
}
// Clean deadNode's network receive channel, or it might exceed the limit
// and block other go routines.
dummyReceiverCtxCancel, _ := utils.LaunchDummyReceiver(
context.Background(), nodes[deadNodeID].network.ReceiveChan(), nil)
defer dummyReceiverCtxCancel()
Loop:
for {
<-time.After(5 * time.Second)
fmt.Println("check latest position delivered by each node")
for _, n := range nodes {
if n.ID == deadNodeID {
continue
}
latestPos := n.app.GetLatestDeliveredPosition()
fmt.Println("latestPos", n.ID, &latestPos)
if latestPos.Round < untilRound {
continue Loop
}
}
// Oh ya.
break
}
delete(nodes, deadNodeID)
s.verifyNodes(nodes)
}
func TestByzantine(t *testing.T) {
suite.Run(t, new(ByzantineTestSuite))
}
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