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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"
"errors"
"flag"
"sync"
"testing"
"time"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
"github.com/ethereum/go-ethereum/rpc"
colorable "github.com/mattn/go-colorable"
)
var (
loglevel = flag.Int("loglevel", 2, "verbosity of logs")
)
func init() {
flag.Parse()
log.PrintOrigins(true)
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(*loglevel), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true))))
}
// TestRun tests if Run method calls RunFunc and if it handles context properly.
func TestRun(t *testing.T) {
sim := New(noopServiceFuncMap)
defer sim.Close()
t.Run("call", func(t *testing.T) {
expect := "something"
var got string
r := sim.Run(context.Background(), func(ctx context.Context, sim *Simulation) error {
got = expect
return nil
})
if r.Error != nil {
t.Errorf("unexpected error: %v", r.Error)
}
if got != expect {
t.Errorf("expected %q, got %q", expect, got)
}
})
t.Run("cancellation", func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
defer cancel()
r := sim.Run(ctx, func(ctx context.Context, sim *Simulation) error {
time.Sleep(time.Second)
return nil
})
if r.Error != context.DeadlineExceeded {
t.Errorf("unexpected error: %v", r.Error)
}
})
t.Run("context value and duration", func(t *testing.T) {
ctx := context.WithValue(context.Background(), "hey", "there")
sleep := 50 * time.Millisecond
r := sim.Run(ctx, func(ctx context.Context, sim *Simulation) error {
if ctx.Value("hey") != "there" {
return errors.New("expected context value not passed")
}
time.Sleep(sleep)
return nil
})
if r.Error != nil {
t.Errorf("unexpected error: %v", r.Error)
}
if r.Duration < sleep {
t.Errorf("reported run duration less then expected: %s", r.Duration)
}
})
}
// TestClose tests are Close method triggers all close functions and are all nodes not up anymore.
func TestClose(t *testing.T) {
var mu sync.Mutex
var cleanupCount int
sleep := 50 * time.Millisecond
sim := New(map[string]ServiceFunc{
"noop": func(ctx *adapters.ServiceContext, b *sync.Map) (node.Service, func(), error) {
return newNoopService(), func() {
time.Sleep(sleep)
mu.Lock()
defer mu.Unlock()
cleanupCount++
}, nil
},
})
nodeCount := 30
_, err := sim.AddNodes(nodeCount)
if err != nil {
t.Fatal(err)
}
var upNodeCount int
for _, n := range sim.Net.GetNodes() {
if n.Up {
upNodeCount++
}
}
if upNodeCount != nodeCount {
t.Errorf("all nodes should be up, insted only %v are up", upNodeCount)
}
sim.Close()
if cleanupCount != nodeCount {
t.Errorf("number of cleanups expected %v, got %v", nodeCount, cleanupCount)
}
upNodeCount = 0
for _, n := range sim.Net.GetNodes() {
if n.Up {
upNodeCount++
}
}
if upNodeCount != 0 {
t.Errorf("all nodes should be down, insted %v are up", upNodeCount)
}
}
// TestDone checks if Close method triggers the closing of done channel.
func TestDone(t *testing.T) {
sim := New(noopServiceFuncMap)
sleep := 50 * time.Millisecond
timeout := 2 * time.Second
start := time.Now()
go func() {
time.Sleep(sleep)
sim.Close()
}()
select {
case <-time.After(timeout):
t.Error("done channel closing timed out")
case <-sim.Done():
if d := time.Since(start); d < sleep {
t.Errorf("done channel closed sooner then expected: %s", d)
}
}
}
// a helper map for usual services that do not do anything
var noopServiceFuncMap = map[string]ServiceFunc{
"noop": noopServiceFunc,
}
// a helper function for most basic noop service
func noopServiceFunc(ctx *adapters.ServiceContext, b *sync.Map) (node.Service, func(), error) {
return newNoopService(), nil, nil
}
// noopService is the service that does not do anything
// but implements node.Service interface.
type noopService struct{}
func newNoopService() node.Service {
return &noopService{}
}
func (t *noopService) Protocols() []p2p.Protocol {
return []p2p.Protocol{}
}
func (t *noopService) APIs() []rpc.API {
return []rpc.API{}
}
func (t *noopService) Start(server *p2p.Server) error {
return nil
}
func (t *noopService) Stop() error {
return nil
}
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