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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/>.
package simulation
import (
"context"
"sync"
"testing"
"time"
)
// TestPeerEvents creates simulation, adds two nodes,
// register for peer events, connects nodes in a chain
// and waits for the number of connection events to
// be received.
func TestPeerEvents(t *testing.T) {
sim := New(noopServiceFuncMap)
defer sim.Close()
_, err := sim.AddNodes(2)
if err != nil {
t.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
events := sim.PeerEvents(ctx, sim.NodeIDs())
// two nodes -> two connection events
expectedEventCount := 2
var wg sync.WaitGroup
wg.Add(expectedEventCount)
go func() {
for e := range events {
if e.Error != nil {
if e.Error == context.Canceled {
return
}
t.Error(e.Error)
continue
}
wg.Done()
}
}()
err = sim.Net.ConnectNodesChain(sim.NodeIDs())
if err != nil {
t.Fatal(err)
}
wg.Wait()
}
func TestPeerEventsTimeout(t *testing.T) {
sim := New(noopServiceFuncMap)
defer sim.Close()
_, err := sim.AddNodes(2)
if err != nil {
t.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
events := sim.PeerEvents(ctx, sim.NodeIDs())
done := make(chan struct{})
errC := make(chan error)
go func() {
for e := range events {
if e.Error == context.Canceled {
return
}
if e.Error == context.DeadlineExceeded {
close(done)
return
} else {
errC <- e.Error
}
}
}()
select {
case <-time.After(time.Second):
t.Fatal("no context deadline received")
case err := <-errC:
t.Fatal(err)
case <-done:
// all good, context deadline detected
}
}
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