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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 integration
import (
"fmt"
"math"
"sort"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core"
"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/test"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
type consensusEventType int
const (
evtProposeBlock consensusEventType = iota
evtReceiveBlock
)
type consensusEventPayload struct {
Type consensusEventType
PiggyBack interface{}
}
// NewProposeBlockEvent constructs an test.Event that would trigger
// block proposing.
func NewProposeBlockEvent(nID types.NodeID, when time.Time) *test.Event {
return test.NewEvent(nID, when, &consensusEventPayload{
Type: evtProposeBlock,
})
}
// NewReceiveBlockEvent constructs an test.Event that would trigger
// block received.
func NewReceiveBlockEvent(
nID types.NodeID, when time.Time, block *types.Block) *test.Event {
return test.NewEvent(nID, when, &consensusEventPayload{
Type: evtReceiveBlock,
PiggyBack: block,
})
}
// Node is designed to work with test.Scheduler.
type Node struct {
ID types.NodeID
chainNum uint32
chainID uint32
lattice *core.Lattice
app *test.App
db blockdb.BlockDatabase
broadcastTargets map[types.NodeID]struct{}
networkLatency test.LatencyModel
proposingLatency test.LatencyModel
}
// NewNode constructs an instance of Node.
func NewNode(
app *test.App,
gov core.Governance,
db blockdb.BlockDatabase,
privateKey crypto.PrivateKey,
networkLatency test.LatencyModel,
proposingLatency test.LatencyModel) *Node {
var (
chainID = uint32(math.MaxUint32)
governanceConfig = gov.Configuration(0)
nodeSetKeys = gov.NodeSet(0)
nodeID = types.NewNodeID(privateKey.PublicKey())
)
broadcastTargets := make(map[types.NodeID]struct{})
for _, k := range nodeSetKeys {
broadcastTargets[types.NewNodeID(k)] = struct{}{}
}
hashes := common.Hashes{}
for nID := range broadcastTargets {
hashes = append(hashes, nID.Hash)
}
sort.Sort(hashes)
for i, h := range hashes {
if h == nodeID.Hash {
chainID = uint32(i)
}
}
delete(broadcastTargets, nodeID)
return &Node{
ID: nodeID,
chainID: chainID,
chainNum: governanceConfig.NumChains,
broadcastTargets: broadcastTargets,
networkLatency: networkLatency,
proposingLatency: proposingLatency,
app: app,
db: db,
lattice: core.NewLattice(
governanceConfig,
core.NewAuthenticator(privateKey),
app,
app,
db),
}
}
// Handle implements test.EventHandler interface.
func (n *Node) Handle(e *test.Event) (events []*test.Event) {
payload := e.Payload.(*consensusEventPayload)
switch payload.Type {
case evtProposeBlock:
events, e.ExecError = n.handleProposeBlock(e.Time, payload.PiggyBack)
case evtReceiveBlock:
events, e.ExecError = n.handleReceiveBlock(payload.PiggyBack)
default:
panic(fmt.Errorf("unknown consensus event type: %v", payload.Type))
}
return
}
func (n *Node) handleProposeBlock(when time.Time, _ interface{}) (
events []*test.Event, err error) {
b, err := n.prepareBlock(when)
if err != nil {
return
}
if err = n.processBlock(b); err != nil {
return
}
// Create 'block received' event for each other nodes.
for nID := range n.broadcastTargets {
events = append(events, NewReceiveBlockEvent(
nID, when.Add(n.networkLatency.Delay()), b.Clone()))
}
// Create next 'block proposing' event for this nodes.
events = append(events, NewProposeBlockEvent(
n.ID, when.Add(n.proposingLatency.Delay())))
return
}
func (n *Node) handleReceiveBlock(piggyback interface{}) (
events []*test.Event, err error) {
err = n.processBlock(piggyback.(*types.Block))
if err != nil {
panic(err)
}
return
}
func (n *Node) prepareBlock(when time.Time) (b *types.Block, err error) {
b = &types.Block{
Position: types.Position{
ChainID: n.chainID,
}}
err = n.lattice.PrepareBlock(b, when)
return
}
func (n *Node) processBlock(b *types.Block) (err error) {
// TODO(mission): this segment of code is identical to testLatticeMgr in
// core/lattice_test.go, except the compaction-chain part.
var (
delivered []*types.Block
verified []*types.Block
pendings = []*types.Block{b}
)
if err = n.lattice.SanityCheck(b); err != nil {
if err == core.ErrAckingBlockNotExists {
err = nil
}
return
}
for {
if len(pendings) == 0 {
break
}
b, pendings = pendings[0], pendings[1:]
if verified, delivered, err = n.lattice.ProcessBlock(b); err != nil {
return
}
// Deliver blocks.
for _, b = range delivered {
if err = n.db.Update(*b); err != nil {
return
}
n.app.BlockDelivered(*b)
}
// Update pending blocks for verified block (pass sanity check).
pendings = append(pendings, verified...)
}
return
}
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