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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 (
"context"
"encoding/json"
"fmt"
"log"
"reflect"
"sync"
"github.com/dexon-foundation/dexon-consensus-core/core/test"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon-consensus-core/simulation/config"
)
// PeerServer is the main object to collect results and monitor simulation.
type PeerServer struct {
peers map[types.NodeID]struct{}
msgChannel chan *test.TransportEnvelope
trans test.TransportServer
peerTotalOrder PeerTotalOrder
peerTotalOrderMu sync.Mutex
verifiedLen uint64
cfg *config.Config
ctx context.Context
ctxCancel context.CancelFunc
}
// NewPeerServer returns a new PeerServer instance.
func NewPeerServer() *PeerServer {
ctx, cancel := context.WithCancel(context.Background())
return &PeerServer{
peers: make(map[types.NodeID]struct{}),
peerTotalOrder: make(PeerTotalOrder),
ctx: ctx,
ctxCancel: cancel,
}
}
// isNode checks if nID is in p.peers. If peer server restarts but
// nodes are not, it will cause panic if nodes send message.
func (p *PeerServer) isNode(nID types.NodeID) bool {
_, exist := p.peers[nID]
return exist
}
// handleBlockList is the handler for messages with BlockList as payload.
func (p *PeerServer) handleBlockList(id types.NodeID, blocks *BlockList) {
p.peerTotalOrderMu.Lock()
defer p.peerTotalOrderMu.Unlock()
readyForVerify := p.peerTotalOrder[id].PushBlocks(*blocks)
if !readyForVerify {
return
}
// Verify the total order result.
go func(id types.NodeID) {
p.peerTotalOrderMu.Lock()
defer p.peerTotalOrderMu.Unlock()
var correct bool
var length int
p.peerTotalOrder, correct, length = VerifyTotalOrder(id, p.peerTotalOrder)
if !correct {
log.Printf("The result of Total Ordering Algorithm has error.\n")
}
p.verifiedLen += uint64(length)
if p.verifiedLen >= p.cfg.Node.MaxBlock {
if err := p.trans.Broadcast(statusShutdown); err != nil {
panic(err)
}
}
}(id)
}
// handleMessage is the handler for messages with Message as payload.
func (p *PeerServer) handleMessage(id types.NodeID, m *message) {
switch m.Type {
case shutdownAck:
delete(p.peers, id)
log.Printf("%v shutdown, %d remains.\n", id, len(p.peers))
if len(p.peers) == 0 {
p.ctxCancel()
}
case blockTimestamp:
msgs := []timestampMessage{}
if err := json.Unmarshal(m.Payload, &msgs); err != nil {
panic(err)
}
for _, msg := range msgs {
if ok := p.peerTotalOrder[id].PushTimestamp(msg); !ok {
panic(fmt.Errorf("unable to push timestamp: %v", m))
}
}
default:
panic(fmt.Errorf("unknown simulation message type: %v", m))
}
}
func (p *PeerServer) mainLoop() {
for {
select {
case <-p.ctx.Done():
return
default:
}
select {
case <-p.ctx.Done():
return
case e := <-p.msgChannel:
if !p.isNode(e.From) {
break
}
// Handle messages based on their type.
switch val := e.Msg.(type) {
case *BlockList:
p.handleBlockList(e.From, val)
case *message:
p.handleMessage(e.From, val)
default:
panic(fmt.Errorf("unknown message: %v", reflect.TypeOf(e.Msg)))
}
}
}
}
// Setup prepares simualtion.
func (p *PeerServer) Setup(
cfg *config.Config) (serverEndpoint interface{}, err error) {
// Setup transport layer.
switch cfg.Networking.Type {
case "tcp", "tcp-local":
p.trans = test.NewTCPTransportServer(&jsonMarshaller{}, peerPort)
case "fake":
p.trans = test.NewFakeTransportServer()
default:
panic(fmt.Errorf("unknown network type: %v", cfg.Networking.Type))
}
p.msgChannel, err = p.trans.Host()
if err != nil {
return
}
p.cfg = cfg
serverEndpoint = p.msgChannel
return
}
// Run the simulation.
func (p *PeerServer) Run() {
if err := p.trans.WaitForPeers(p.cfg.Node.Num); err != nil {
panic(err)
}
// Cache peers' info.
p.peers = p.trans.Peers()
// Initialize total order result cache.
for id := range p.peers {
p.peerTotalOrder[id] = NewTotalOrderResult(id)
}
// Block to handle incoming messages.
p.mainLoop()
// The simulation is done, clean up.
LogStatus(p.peerTotalOrder)
if err := p.trans.Close(); err != nil {
log.Printf("Error shutting down peerServer: %v\n", err)
}
}
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