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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 test
import (
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus/core/crypto"
"github.com/dexon-foundation/dexon-consensus/core/types"
)
type fakePeerRecord struct {
sendChannel chan<- *TransportEnvelope
pubKey crypto.PublicKey
}
type fakeHandshake struct {
dMoment time.Time
peers map[types.NodeID]fakePeerRecord
}
// FakeTransport implement TransportServer and TransportClient interface
// by using golang channel.
type FakeTransport struct {
peerType TransportPeerType
nID types.NodeID
pubKey crypto.PublicKey
recvChannel chan *TransportEnvelope
serverChannel chan<- *TransportEnvelope
peers map[types.NodeID]fakePeerRecord
dMoment time.Time
}
// NewFakeTransportServer constructs FakeTransport instance for peer server.
func NewFakeTransportServer() TransportServer {
return &FakeTransport{
peerType: TransportPeerServer,
recvChannel: make(chan *TransportEnvelope, 1000),
}
}
// NewFakeTransportClient constructs FakeTransport instance for peer.
func NewFakeTransportClient(pubKey crypto.PublicKey) TransportClient {
return &FakeTransport{
peerType: TransportPeer,
recvChannel: make(chan *TransportEnvelope, 1000),
nID: types.NewNodeID(pubKey),
pubKey: pubKey,
}
}
// Disconnect implements Transport.Disconnect method.
func (t *FakeTransport) Disconnect(endpoint types.NodeID) {
delete(t.peers, endpoint)
}
// Send implements Transport.Send method.
func (t *FakeTransport) Send(
endpoint types.NodeID, msg interface{}) (err error) {
rec, exists := t.peers[endpoint]
if !exists {
err = fmt.Errorf("the endpoint does not exists: %v", endpoint)
return
}
go func(ch chan<- *TransportEnvelope) {
ch <- &TransportEnvelope{
PeerType: t.peerType,
From: t.nID,
Msg: msg,
}
}(rec.sendChannel)
return
}
// Report implements Transport.Report method.
func (t *FakeTransport) Report(msg interface{}) (err error) {
go func() {
t.serverChannel <- &TransportEnvelope{
PeerType: TransportPeer,
From: t.nID,
Msg: msg,
}
}()
return
}
// Broadcast implements Transport.Broadcast method.
func (t *FakeTransport) Broadcast(endpoints map[types.NodeID]struct{},
latency LatencyModel, msg interface{}) (err error) {
for ID := range endpoints {
if ID == t.nID {
continue
}
go func(nID types.NodeID) {
time.Sleep(latency.Delay())
// #nosec G104
t.Send(nID, msg)
}(ID)
}
return
}
// Close implements Transport.Close method.
func (t *FakeTransport) Close() (err error) {
close(t.recvChannel)
return
}
// Peers implements Transport.Peers method.
func (t *FakeTransport) Peers() (peers []crypto.PublicKey) {
for _, rec := range t.peers {
peers = append(peers, rec.pubKey)
}
return
}
// Join implements TransportClient.Join method.
func (t *FakeTransport) Join(
serverEndpoint interface{}) (<-chan *TransportEnvelope, error) {
var (
envelopes = []*TransportEnvelope{}
ok bool
)
if t.serverChannel, ok = serverEndpoint.(chan *TransportEnvelope); !ok {
return nil, fmt.Errorf("accept channel of *TransportEnvelope when join")
}
if err := t.Report(t); err != nil {
panic(err)
}
// Wait for peers info.
for {
envelope := <-t.recvChannel
if envelope.PeerType != TransportPeerServer {
envelopes = append(envelopes, envelope)
continue
}
if handShake, ok := envelope.Msg.(fakeHandshake); ok {
t.dMoment = handShake.dMoment
t.peers = handShake.peers
} else {
envelopes = append(envelopes, envelope)
continue
}
for _, envelope := range envelopes {
t.recvChannel <- envelope
}
break
}
return t.recvChannel, nil
}
// DMoment implments TrnansportClient.DMoment method.
func (t *FakeTransport) DMoment() time.Time {
return t.dMoment
}
// Host implements TransportServer.Host method.
func (t *FakeTransport) Host() (chan *TransportEnvelope, error) {
return t.recvChannel, nil
}
// SetDMoment implements TransportServer.SetDMoment method.
func (t *FakeTransport) SetDMoment(dMoment time.Time) {
t.dMoment = dMoment
}
// WaitForPeers implements TransportServer.WaitForPeers method.
func (t *FakeTransport) WaitForPeers(numPeers uint32) (err error) {
t.peers = make(map[types.NodeID]fakePeerRecord)
for {
envelope := <-t.recvChannel
// Panic here if some peer send other stuffs before
// receiving peer lists.
newPeer := envelope.Msg.(*FakeTransport)
t.peers[envelope.From] = fakePeerRecord{
sendChannel: newPeer.recvChannel,
pubKey: newPeer.pubKey,
}
if uint32(len(t.peers)) == numPeers {
break
}
}
// The collected peer channels are shared for all peers.
peers := make(map[types.NodeID]struct{})
for ID := range t.peers {
peers[ID] = struct{}{}
}
handShake := fakeHandshake{
dMoment: t.dMoment,
peers: t.peers,
}
if err = t.Broadcast(peers, &FixedLatencyModel{}, handShake); err != nil {
return
}
return
}
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