// 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 network
import (
"context"
"sync"
"testing"
"time"
"github.com/dexon-foundation/dexon/p2p/enode"
)
var requestedPeerID = enode.HexID("3431c3939e1ee2a6345e976a8234f9870152d64879f30bc272a074f6859e75e8")
var sourcePeerID = enode.HexID("99d8594b52298567d2ca3f4c441a5ba0140ee9245e26460d01102a52773c73b9")
// mockRequester pushes every request to the requestC channel when its doRequest function is called
type mockRequester struct {
// requests []Request
requestC chan *Request // when a request is coming it is pushed to requestC
waitTimes []time.Duration // with waitTimes[i] you can define how much to wait on the ith request (optional)
count int //counts the number of requests
quitC chan struct{}
}
func newMockRequester(waitTimes ...time.Duration) *mockRequester {
return &mockRequester{
requestC: make(chan *Request),
waitTimes: waitTimes,
quitC: make(chan struct{}),
}
}
func (m *mockRequester) doRequest(ctx context.Context, request *Request) (*enode.ID, chan struct{}, error) {
waitTime := time.Duration(0)
if m.count < len(m.waitTimes) {
waitTime = m.waitTimes[m.count]
m.count++
}
time.Sleep(waitTime)
m.requestC <- request
// if there is a Source in the request use that, if not use the global requestedPeerId
source := request.Source
if source == nil {
source = &requestedPeerID
}
return source, m.quitC, nil
}
// TestFetcherSingleRequest creates a Fetcher using mockRequester, and run it with a sample set of peers to skip.
// mockRequester pushes a Request on a channel every time the request function is called. Using
// this channel we test if calling Fetcher.Request calls the request function, and whether it uses
// the correct peers to skip which we provided for the fetcher.run function.
func TestFetcherSingleRequest(t *testing.T) {
requester := newMockRequester()
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peers := []string{"a", "b", "c", "d"}
peersToSkip := &sync.Map{}
for _, p := range peers {
peersToSkip.Store(p, time.Now())
}
go fetcher.run(peersToSkip)
fetcher.Request(0)
select {
case request := <-requester.requestC:
// request should contain all peers from peersToSkip provided to the fetcher
for _, p := range peers {
if _, ok := request.peersToSkip.Load(p); !ok {
t.Fatalf("request.peersToSkip misses peer")
}
}
// source peer should be also added to peersToSkip eventually
time.Sleep(100 * time.Millisecond)
if _, ok := request.peersToSkip.Load(requestedPeerID.String()); !ok {
t.Fatalf("request.peersToSkip does not contain peer returned by the request function")
}
// hopCount in the forwarded request should be incremented
if request.HopCount != 1 {
t.Fatalf("Expected request.HopCount 1 got %v", request.HopCount)
}
// fetch should trigger a request, if it doesn't happen in time, test should fail
case <-time.After(200 * time.Millisecond):
t.Fatalf("fetch timeout")
}
}
// TestCancelStopsFetcher tests that a cancelled fetcher does not initiate further requests even if its fetch function is called
func TestFetcherCancelStopsFetcher(t *testing.T) {
requester := newMockRequester()
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peersToSkip := &sync.Map{}
// we start the fetcher, and then we immediately cancel the context
go fetcher.run(peersToSkip)
cancel()
// we call Request with an active context
fetcher.Request(0)
// fetcher should not initiate request, we can only check by waiting a bit and making sure no request is happening
select {
case <-requester.requestC:
t.Fatalf("cancelled fetcher initiated request")
case <-time.After(200 * time.Millisecond):
}
}
// TestFetchCancelStopsRequest tests that calling a Request function with a cancelled context does not initiate a request
func TestFetcherCancelStopsRequest(t *testing.T) {
t.Skip("since context is now per fetcher, this test is likely redundant")
requester := newMockRequester(100 * time.Millisecond)
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peersToSkip := &sync.Map{}
// we start the fetcher with an active context
go fetcher.run(peersToSkip)
// we call Request with a cancelled context
fetcher.Request(0)
// fetcher should not initiate request, we can only check by waiting a bit and making sure no request is happening
select {
case <-requester.requestC:
t.Fatalf("cancelled fetch function initiated request")
case <-time.After(200 * time.Millisecond):
}
// if there is another Request with active context, there should be a request, because the fetcher itself is not cancelled
fetcher.Request(0)
select {
case <-requester.requestC:
case <-time.After(200 * time.Millisecond):
t.Fatalf("expected request")
}
}
// TestOfferUsesSource tests Fetcher Offer behavior.
// In this case there should be 1 (and only one) request initiated from the source peer, and the
// source nodeid should appear in the peersToSkip map.
func TestFetcherOfferUsesSource(t *testing.T) {
requester := newMockRequester(100 * time.Millisecond)
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peersToSkip := &sync.Map{}
// start the fetcher
go fetcher.run(peersToSkip)
// call the Offer function with the source peer
fetcher.Offer(&sourcePeerID)
// fetcher should not initiate request
select {
case <-requester.requestC:
t.Fatalf("fetcher initiated request")
case <-time.After(200 * time.Millisecond):
}
// call Request after the Offer
fetcher.Request(0)
// there should be exactly 1 request coming from fetcher
var request *Request
select {
case request = <-requester.requestC:
if *request.Source != sourcePeerID {
t.Fatalf("Expected source id %v got %v", sourcePeerID, request.Source)
}
case <-time.After(200 * time.Millisecond):
t.Fatalf("fetcher did not initiate request")
}
select {
case <-requester.requestC:
t.Fatalf("Fetcher number of requests expected 1 got 2")
case <-time.After(200 * time.Millisecond):
}
// source peer should be added to peersToSkip eventually
time.Sleep(100 * time.Millisecond)
if _, ok := request.peersToSkip.Load(sourcePeerID.String()); !ok {
t.Fatalf("SourcePeerId not added to peersToSkip")
}
}
func TestFetcherOfferAfterRequestUsesSourceFromContext(t *testing.T) {
requester := newMockRequester(100 * time.Millisecond)
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peersToSkip := &sync.Map{}
// start the fetcher
go fetcher.run(peersToSkip)
// call Request first
fetcher.Request(0)
// there should be a request coming from fetcher
var request *Request
select {
case request = <-requester.requestC:
if request.Source != nil {
t.Fatalf("Incorrect source peer id, expected nil got %v", request.Source)
}
case <-time.After(200 * time.Millisecond):
t.Fatalf("fetcher did not initiate request")
}
// after the Request call Offer
fetcher.Offer(&sourcePeerID)
// there should be a request coming from fetcher
select {
case request = <-requester.requestC:
if *request.Source != sourcePeerID {
t.Fatalf("Incorrect source peer id, expected %v got %v", sourcePeerID, request.Source)
}
case <-time.After(200 * time.Millisecond):
t.Fatalf("fetcher did not initiate request")
}
// source peer should be added to peersToSkip eventually
time.Sleep(100 * time.Millisecond)
if _, ok := request.peersToSkip.Load(sourcePeerID.String()); !ok {
t.Fatalf("SourcePeerId not added to peersToSkip")
}
}
// TestFetcherRetryOnTimeout tests that fetch retries after searchTimeOut has passed
func TestFetcherRetryOnTimeout(t *testing.T) {
requester := newMockRequester()
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
// set searchTimeOut to low value so the test is quicker
fetcher.searchTimeout = 250 * time.Millisecond
peersToSkip := &sync.Map{}
// start the fetcher
go fetcher.run(peersToSkip)
// call the fetch function with an active context
fetcher.Request(0)
// after 100ms the first request should be initiated
time.Sleep(100 * time.Millisecond)
select {
case <-requester.requestC:
default:
t.Fatalf("fetch did not initiate request")
}
// after another 100ms no new request should be initiated, because search timeout is 250ms
time.Sleep(100 * time.Millisecond)
select {
case <-requester.requestC:
t.Fatalf("unexpected request from fetcher")
default:
}
// after another 300ms search timeout is over, there should be a new request
time.Sleep(300 * time.Millisecond)
select {
case <-requester.requestC:
default:
t.Fatalf("fetch did not retry request")
}
}
// TestFetcherFactory creates a FetcherFactory and checks if the factory really creates and starts
// a Fetcher when it return a fetch function. We test the fetching functionality just by checking if
// a request is initiated when the fetch function is called
func TestFetcherFactory(t *testing.T) {
requester := newMockRequester(100 * time.Millisecond)
addr := make([]byte, 32)
fetcherFactory := NewFetcherFactory(requester.doRequest, false)
peersToSkip := &sync.Map{}
fetcher := fetcherFactory.New(context.Background(), addr, peersToSkip)
fetcher.Request(0)
// check if the created fetchFunction really starts a fetcher and initiates a request
select {
case <-requester.requestC:
case <-time.After(200 * time.Millisecond):
t.Fatalf("fetch timeout")
}
}
func TestFetcherRequestQuitRetriesRequest(t *testing.T) {
requester := newMockRequester()
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
// make sure the searchTimeout is long so it is sure the request is not
// retried because of timeout
fetcher.searchTimeout = 10 * time.Second
peersToSkip := &sync.Map{}
go fetcher.run(peersToSkip)
fetcher.Request(0)
select {
case <-requester.requestC:
case <-time.After(200 * time.Millisecond):
t.Fatalf("request is not initiated")
}
close(requester.quitC)
select {
case <-requester.requestC:
case <-time.After(200 * time.Millisecond):
t.Fatalf("request is not initiated after failed request")
}
}
// TestRequestSkipPeer checks if PeerSkip function will skip provided peer
// and not skip unknown one.
func TestRequestSkipPeer(t *testing.T) {
addr := make([]byte, 32)
peers := []enode.ID{
enode.HexID("3431c3939e1ee2a6345e976a8234f9870152d64879f30bc272a074f6859e75e8"),
enode.HexID("99d8594b52298567d2ca3f4c441a5ba0140ee9245e26460d01102a52773c73b9"),
}
peersToSkip := new(sync.Map)
peersToSkip.Store(peers[0].String(), time.Now())
r := NewRequest(addr, false, peersToSkip)
if !r.SkipPeer(peers[0].String()) {
t.Errorf("peer not skipped")
}
if r.SkipPeer(peers[1].String()) {
t.Errorf("peer skipped")
}
}
// TestRequestSkipPeerExpired checks if a peer to skip is not skipped
// after RequestTimeout has passed.
func TestRequestSkipPeerExpired(t *testing.T) {
addr := make([]byte, 32)
peer := enode.HexID("3431c3939e1ee2a6345e976a8234f9870152d64879f30bc272a074f6859e75e8")
// set RequestTimeout to a low value and reset it after the test
defer func(t time.Duration) { RequestTimeout = t }(RequestTimeout)
RequestTimeout = 250 * time.Millisecond
peersToSkip := new(sync.Map)
peersToSkip.Store(peer.String(), time.Now())
r := NewRequest(addr, false, peersToSkip)
if !r.SkipPeer(peer.String()) {
t.Errorf("peer not skipped")
}
time.Sleep(500 * time.Millisecond)
if r.SkipPeer(peer.String()) {
t.Errorf("peer skipped")
}
}
// TestRequestSkipPeerPermanent checks if a peer to skip is not skipped
// after RequestTimeout is not skipped if it is set for a permanent skipping
// by value to peersToSkip map is not time.Duration.
func TestRequestSkipPeerPermanent(t *testing.T) {
addr := make([]byte, 32)
peer := enode.HexID("3431c3939e1ee2a6345e976a8234f9870152d64879f30bc272a074f6859e75e8")
// set RequestTimeout to a low value and reset it after the test
defer func(t time.Duration) { RequestTimeout = t }(RequestTimeout)
RequestTimeout = 250 * time.Millisecond
peersToSkip := new(sync.Map)
peersToSkip.Store(peer.String(), true)
r := NewRequest(addr, false, peersToSkip)
if !r.SkipPeer(peer.String()) {
t.Errorf("peer not skipped")
}
time.Sleep(500 * time.Millisecond)
if !r.SkipPeer(peer.String()) {
t.Errorf("peer not skipped")
}
}
func TestFetcherMaxHopCount(t *testing.T) {
requester := newMockRequester()
addr := make([]byte, 32)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
fetcher := NewFetcher(ctx, addr, requester.doRequest, true)
peersToSkip := &sync.Map{}
go fetcher.run(peersToSkip)
// if hopCount is already at max no request should be initiated
select {
case <-requester.requestC:
t.Fatalf("cancelled fetcher initiated request")
case <-time.After(200 * time.Millisecond):
}
}