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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// +build withserver
package stream
import (
"context"
"fmt"
"testing"
"time"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/simulations"
"github.com/ethereum/go-ethereum/swarm/log"
"github.com/ethereum/go-ethereum/swarm/network/simulation"
"github.com/ethereum/go-ethereum/swarm/storage"
)
/*
The tests in this file need to be executed with
-tags=withserver
Also, they will stall if executed stand-alone, because they wait
for the visualization frontend to send a POST /runsim message.
*/
//setup the sim, evaluate nodeCount and chunkCount and create the sim
func setupSim(serviceMap map[string]simulation.ServiceFunc) (int, int, *simulation.Simulation) {
nodeCount := *nodes
chunkCount := *chunks
if nodeCount == 0 || chunkCount == 0 {
nodeCount = 32
chunkCount = 1
}
//setup the simulation with server, which means the sim won't run
//until it receives a POST /runsim from the frontend
sim := simulation.New(serviceMap).WithServer(":8888")
return nodeCount, chunkCount, sim
}
//watch for disconnections and wait for healthy
func watchSim(sim *simulation.Simulation) (context.Context, context.CancelFunc) {
ctx, cancelSimRun := context.WithTimeout(context.Background(), 1*time.Minute)
if _, err := sim.WaitTillHealthy(ctx, 2); err != nil {
panic(err)
}
disconnections := sim.PeerEvents(
context.Background(),
sim.NodeIDs(),
simulation.NewPeerEventsFilter().Type(p2p.PeerEventTypeDrop),
)
go func() {
for d := range disconnections {
log.Error("peer drop", "node", d.NodeID, "peer", d.Event.Peer)
panic("unexpected disconnect")
cancelSimRun()
}
}()
return ctx, cancelSimRun
}
//This test requests bogus hashes into the network
func TestNonExistingHashesWithServer(t *testing.T) {
nodeCount, _, sim := setupSim(retrievalSimServiceMap)
defer sim.Close()
err := sim.UploadSnapshot(fmt.Sprintf("testing/snapshot_%d.json", nodeCount))
if err != nil {
panic(err)
}
ctx, cancelSimRun := watchSim(sim)
defer cancelSimRun()
//in order to get some meaningful visualization, it is beneficial
//to define a minimum duration of this test
testDuration := 20 * time.Second
result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) error {
//check on the node's FileStore (netstore)
id := sim.RandomUpNode().ID
item, ok := sim.NodeItem(id, bucketKeyFileStore)
if !ok {
t.Fatalf("No filestore")
}
fileStore := item.(*storage.FileStore)
//create a bogus hash
fakeHash := storage.GenerateRandomChunk(1000).Address()
//try to retrieve it - will propagate RetrieveRequestMsg into the network
reader, _ := fileStore.Retrieve(context.TODO(), fakeHash)
if _, err := reader.Size(ctx, nil); err != nil {
log.Debug("expected error for non-existing chunk")
}
//sleep so that the frontend can have something to display
time.Sleep(testDuration)
return nil
})
if result.Error != nil {
sendSimTerminatedEvent(sim)
t.Fatal(result.Error)
}
sendSimTerminatedEvent(sim)
}
//send a termination event to the frontend
func sendSimTerminatedEvent(sim *simulation.Simulation) {
evt := &simulations.Event{
Type: EventTypeSimTerminated,
Control: false,
}
sim.Net.Events().Send(evt)
}
//This test is the same as the snapshot sync test,
//but with a HTTP server
//It also sends some custom events so that the frontend
//can visualize messages like SendOfferedMsg, WantedHashesMsg, DeliveryMsg
func TestSnapshotSyncWithServer(t *testing.T) {
nodeCount, chunkCount, sim := setupSim(simServiceMap)
defer sim.Close()
log.Info("Initializing test config")
conf := &synctestConfig{}
//map of discover ID to indexes of chunks expected at that ID
conf.idToChunksMap = make(map[discover.NodeID][]int)
//map of overlay address to discover ID
conf.addrToIDMap = make(map[string]discover.NodeID)
//array where the generated chunk hashes will be stored
conf.hashes = make([]storage.Address, 0)
err := sim.UploadSnapshot(fmt.Sprintf("testing/snapshot_%d.json", nodeCount))
if err != nil {
panic(err)
}
ctx, cancelSimRun := watchSim(sim)
defer cancelSimRun()
//setup filters in the event feed
offeredHashesFilter := simulation.NewPeerEventsFilter().Type(p2p.PeerEventTypeMsgRecv).Protocol("stream").MsgCode(1)
wantedFilter := simulation.NewPeerEventsFilter().Type(p2p.PeerEventTypeMsgRecv).Protocol("stream").MsgCode(2)
deliveryFilter := simulation.NewPeerEventsFilter().Type(p2p.PeerEventTypeMsgRecv).Protocol("stream").MsgCode(6)
eventC := sim.PeerEvents(ctx, sim.UpNodeIDs(), offeredHashesFilter, wantedFilter, deliveryFilter)
quit := make(chan struct{})
go func() {
for e := range eventC {
select {
case <-quit:
fmt.Println("quitting event loop")
return
default:
}
if e.Error != nil {
t.Fatal(e.Error)
}
if *e.Event.MsgCode == uint64(1) {
evt := &simulations.Event{
Type: EventTypeChunkOffered,
Node: sim.Net.GetNode(e.NodeID),
Control: false,
}
sim.Net.Events().Send(evt)
} else if *e.Event.MsgCode == uint64(2) {
evt := &simulations.Event{
Type: EventTypeChunkWanted,
Node: sim.Net.GetNode(e.NodeID),
Control: false,
}
sim.Net.Events().Send(evt)
} else if *e.Event.MsgCode == uint64(6) {
evt := &simulations.Event{
Type: EventTypeChunkDelivered,
Node: sim.Net.GetNode(e.NodeID),
Control: false,
}
sim.Net.Events().Send(evt)
}
}
}()
//run the sim
result := runSim(conf, ctx, sim, chunkCount)
//send terminated event
evt := &simulations.Event{
Type: EventTypeSimTerminated,
Control: false,
}
sim.Net.Events().Send(evt)
if result.Error != nil {
panic(result.Error)
}
close(quit)
log.Info("Simulation ended")
}
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