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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"
"net"
"strconv"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"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"
)
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"`
}
type timestampEvent string
const (
blockSeen timestampEvent = "blockSeen"
timestampConfirm timestampEvent = "timestampConfirm"
timestampAck timestampEvent = "timestampAck"
)
// TimestampMessage is a struct for peer sending consensus timestamp information
// to server.
type timestampMessage struct {
BlockHash common.Hash `json:"hash"`
Event timestampEvent `json:"event"`
Timestamp time.Time `json:"timestamp"`
}
type infoStatus string
const (
statusInit infoStatus = "init"
statusNormal infoStatus = "normal"
statusShutdown infoStatus = "shutdown"
)
// infoMessage is a struct used by peerServer's /info.
type infoMessage struct {
Status infoStatus `json:"status"`
Peers map[types.ValidatorID]string `json:"peers"`
}
// network implements core.Network interface and other methods for simulation
// based on test.TransportClient.
type network struct {
cfg config.Networking
ctx context.Context
ctxCancel context.CancelFunc
trans test.TransportClient
fromTransport <-chan *test.TransportEnvelope
toConsensus chan interface{}
toValidator chan interface{}
}
// newNetwork setup network stuffs for validators, which provides an
// implementation of core.Network based on test.TransportClient.
func newNetwork(vID types.ValidatorID, cfg config.Networking) (n *network) {
// Construct latency model.
latency := &test.NormalLatencyModel{
Mean: cfg.Mean,
Sigma: cfg.Sigma,
}
// Construct basic network instance.
n = &network{
cfg: cfg,
toValidator: make(chan interface{}, 1000),
toConsensus: make(chan interface{}, 1000),
}
n.ctx, n.ctxCancel = context.WithCancel(context.Background())
// Construct transport layer.
switch cfg.Type {
case config.NetworkTypeTCPLocal:
n.trans = test.NewTCPTransportClient(
vID, latency, &jsonMarshaller{}, true)
case config.NetworkTypeTCP:
n.trans = test.NewTCPTransportClient(
vID, latency, &jsonMarshaller{}, false)
case config.NetworkTypeFake:
n.trans = test.NewFakeTransportClient(vID, latency)
default:
panic(fmt.Errorf("unknown network type: %v", cfg.Type))
}
return
}
// BroadcastVote implements core.Network interface.
func (n *network) BroadcastVote(vote *types.Vote) {
if err := n.trans.Broadcast(vote); err != nil {
panic(err)
}
}
// BroadcastBlock implements core.Network interface.
func (n *network) BroadcastBlock(block *types.Block) {
if err := n.trans.Broadcast(block); err != nil {
panic(err)
}
}
// BroadcastNotaryAck implements core.Network interface.
func (n *network) BroadcastNotaryAck(notaryAck *types.NotaryAck) {
if err := n.trans.Broadcast(notaryAck); err != nil {
panic(err)
}
}
// ReceiveChan implements core.Network interface.
func (n *network) ReceiveChan() <-chan interface{} {
return n.toConsensus
}
// receiveChanForValidator returns a channel for validators' specific
// messages.
func (n *network) receiveChanForValidator() <-chan interface{} {
return n.toValidator
}
// setup transport layer.
func (n *network) setup(serverEndpoint interface{}) (err error) {
// Join the p2p network.
switch n.cfg.Type {
case config.NetworkTypeTCP, config.NetworkTypeTCPLocal:
addr := net.JoinHostPort(n.cfg.PeerServer, strconv.Itoa(peerPort))
n.fromTransport, err = n.trans.Join(addr)
case config.NetworkTypeFake:
n.fromTransport, err = n.trans.Join(serverEndpoint)
default:
err = fmt.Errorf("unknown network type: %v", n.cfg.Type)
}
if err != nil {
return
}
return
}
// run the main loop.
func (n *network) run() {
// The dispatcher declararion:
// to consensus or validator, that's the question.
disp := func(e *test.TransportEnvelope) {
switch e.Msg.(type) {
case *types.Block, *types.Vote, *types.NotaryAck:
n.toConsensus <- e.Msg
default:
n.toValidator <- e.Msg
}
}
MainLoop:
for {
select {
case <-n.ctx.Done():
break MainLoop
default:
}
select {
case <-n.ctx.Done():
break MainLoop
case e, ok := <-n.fromTransport:
if !ok {
break MainLoop
}
disp(e)
}
}
}
// Close stop the network.
func (n *network) Close() (err error) {
n.ctxCancel()
close(n.toConsensus)
n.toConsensus = nil
close(n.toValidator)
n.toValidator = nil
if err = n.trans.Close(); err != nil {
return
}
return
}
// report exports 'Report' method of test.TransportClient.
func (n *network) report(msg interface{}) error {
return n.trans.Report(msg)
}
// peers exports 'Peers' method of test.Transport.
func (n *network) peers() map[types.ValidatorID]struct{} {
return n.trans.Peers()
}
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