// Copyright 2019 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 stream
import (
"context"
"fmt"
"reflect"
"sort"
"sync"
"testing"
"time"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
"github.com/ethereum/go-ethereum/swarm/chunk"
"github.com/ethereum/go-ethereum/swarm/network"
"github.com/ethereum/go-ethereum/swarm/network/simulation"
"github.com/ethereum/go-ethereum/swarm/state"
)
// TestSyncSubscriptionsDiff validates the output of syncSubscriptionsDiff
// function for various arguments.
func TestSyncSubscriptionsDiff(t *testing.T) {
max := network.NewKadParams().MaxProxDisplay
for _, tc := range []struct {
po, prevDepth, newDepth int
subBins, quitBins []int
}{
{
po: 0, prevDepth: -1, newDepth: 0,
subBins: []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 1, prevDepth: -1, newDepth: 0,
subBins: []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 2, prevDepth: -1, newDepth: 0,
subBins: []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 0, prevDepth: -1, newDepth: 1,
subBins: []int{0},
},
{
po: 1, prevDepth: -1, newDepth: 1,
subBins: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 2, prevDepth: -1, newDepth: 2,
subBins: []int{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 3, prevDepth: -1, newDepth: 2,
subBins: []int{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 1, prevDepth: -1, newDepth: 2,
subBins: []int{1},
},
{
po: 0, prevDepth: 0, newDepth: 0, // 0-16 -> 0-16
},
{
po: 1, prevDepth: 0, newDepth: 0, // 0-16 -> 0-16
},
{
po: 0, prevDepth: 0, newDepth: 1, // 0-16 -> 0
quitBins: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 0, prevDepth: 0, newDepth: 2, // 0-16 -> 0
quitBins: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 1, prevDepth: 0, newDepth: 1, // 0-16 -> 1-16
quitBins: []int{0},
},
{
po: 1, prevDepth: 1, newDepth: 0, // 1-16 -> 0-16
subBins: []int{0},
},
{
po: 4, prevDepth: 0, newDepth: 1, // 0-16 -> 1-16
quitBins: []int{0},
},
{
po: 4, prevDepth: 0, newDepth: 4, // 0-16 -> 4-16
quitBins: []int{0, 1, 2, 3},
},
{
po: 4, prevDepth: 0, newDepth: 5, // 0-16 -> 4
quitBins: []int{0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 4, prevDepth: 5, newDepth: 0, // 4 -> 0-16
subBins: []int{0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
},
{
po: 4, prevDepth: 5, newDepth: 6, // 4 -> 4
},
} {
subBins, quitBins := syncSubscriptionsDiff(tc.po, tc.prevDepth, tc.newDepth, max)
if fmt.Sprint(subBins) != fmt.Sprint(tc.subBins) {
t.Errorf("po: %v, prevDepth: %v, newDepth: %v: got subBins %v, want %v", tc.po, tc.prevDepth, tc.newDepth, subBins, tc.subBins)
}
if fmt.Sprint(quitBins) != fmt.Sprint(tc.quitBins) {
t.Errorf("po: %v, prevDepth: %v, newDepth: %v: got quitBins %v, want %v", tc.po, tc.prevDepth, tc.newDepth, quitBins, tc.quitBins)
}
}
}
// TestUpdateSyncingSubscriptions validates that syncing subscriptions are correctly
// made on initial node connections and that subscriptions are correctly changed
// when kademlia neighbourhood depth is changed by connecting more nodes.
func TestUpdateSyncingSubscriptions(t *testing.T) {
sim := simulation.New(map[string]simulation.ServiceFunc{
"streamer": func(ctx *adapters.ServiceContext, bucket *sync.Map) (s node.Service, cleanup func(), err error) {
addr, netStore, delivery, clean, err := newNetStoreAndDelivery(ctx, bucket)
if err != nil {
return nil, nil, err
}
r := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), &RegistryOptions{
SyncUpdateDelay: 100 * time.Millisecond,
Syncing: SyncingAutoSubscribe,
}, nil)
cleanup = func() {
r.Close()
clean()
}
bucket.Store("bzz-address", addr)
return r, cleanup, nil
},
})
defer sim.Close()
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
defer cancel()
result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) (err error) {
// initial nodes, first one as pivot center of the start
ids, err := sim.AddNodesAndConnectStar(10)
if err != nil {
return err
}
// pivot values
pivotRegistryID := ids[0]
pivotRegistry := sim.Service("streamer", pivotRegistryID).(*Registry)
pivotKademlia := pivotRegistry.delivery.kad
// nodes proximities from the pivot node
nodeProximities := make(map[string]int)
for _, id := range ids[1:] {
bzzAddr, ok := sim.NodeItem(id, "bzz-address")
if !ok {
t.Fatal("no bzz address for node")
}
nodeProximities[id.String()] = chunk.Proximity(pivotKademlia.BaseAddr(), bzzAddr.(*network.BzzAddr).Over())
}
// wait until sync subscriptions are done for all nodes
waitForSubscriptions(t, pivotRegistry, ids[1:]...)
// check initial sync streams
err = checkSyncStreamsWithRetry(pivotRegistry, nodeProximities)
if err != nil {
return err
}
// add more nodes until the depth is changed
prevDepth := pivotKademlia.NeighbourhoodDepth()
var noDepthChangeChecked bool // true it there was a check when no depth is changed
for {
ids, err := sim.AddNodes(5)
if err != nil {
return err
}
// add new nodes to sync subscriptions check
for _, id := range ids {
bzzAddr, ok := sim.NodeItem(id, "bzz-address")
if !ok {
t.Fatal("no bzz address for node")
}
nodeProximities[id.String()] = chunk.Proximity(pivotKademlia.BaseAddr(), bzzAddr.(*network.BzzAddr).Over())
}
err = sim.Net.ConnectNodesStar(ids, pivotRegistryID)
if err != nil {
return err
}
waitForSubscriptions(t, pivotRegistry, ids...)
newDepth := pivotKademlia.NeighbourhoodDepth()
// depth is not changed, check if streams are still correct
if newDepth == prevDepth {
err = checkSyncStreamsWithRetry(pivotRegistry, nodeProximities)
if err != nil {
return err
}
noDepthChangeChecked = true
}
// do the final check when depth is changed and
// there has been at least one check
// for the case when depth is not changed
if newDepth != prevDepth && noDepthChangeChecked {
// check sync streams for changed depth
return checkSyncStreamsWithRetry(pivotRegistry, nodeProximities)
}
prevDepth = newDepth
}
})
if result.Error != nil {
t.Fatal(result.Error)
}
}
// waitForSubscriptions is a test helper function that blocks until
// stream server subscriptions are established on the provided registry
// to the nodes with provided IDs.
func waitForSubscriptions(t *testing.T, r *Registry, ids ...enode.ID) {
t.Helper()
for retries := 0; retries < 100; retries++ {
subs := r.api.GetPeerServerSubscriptions()
if allSubscribed(subs, ids) {
return
}
time.Sleep(50 * time.Millisecond)
}
t.Fatalf("missing subscriptions")
}
// allSubscribed returns true if nodes with ids have subscriptions
// in provided subs map.
func allSubscribed(subs map[string][]string, ids []enode.ID) bool {
for _, id := range ids {
if s, ok := subs[id.String()]; !ok || len(s) == 0 {
return false
}
}
return true
}
// checkSyncStreamsWithRetry is calling checkSyncStreams with retries.
func checkSyncStreamsWithRetry(r *Registry, nodeProximities map[string]int) (err error) {
for retries := 0; retries < 5; retries++ {
err = checkSyncStreams(r, nodeProximities)
if err == nil {
return nil
}
time.Sleep(500 * time.Millisecond)
}
return err
}
// checkSyncStreams validates that registry contains expected sync
// subscriptions to nodes with proximities in a map nodeProximities.
func checkSyncStreams(r *Registry, nodeProximities map[string]int) error {
depth := r.delivery.kad.NeighbourhoodDepth()
maxPO := r.delivery.kad.MaxProxDisplay
for id, po := range nodeProximities {
wantStreams := syncStreams(po, depth, maxPO)
gotStreams := nodeStreams(r, id)
if r.getPeer(enode.HexID(id)) == nil {
// ignore removed peer
continue
}
if !reflect.DeepEqual(gotStreams, wantStreams) {
return fmt.Errorf("node %s got streams %v, want %v", id, gotStreams, wantStreams)
}
}
return nil
}
// syncStreams returns expected sync streams that need to be
// established between a node with kademlia neighbourhood depth
// and a node with proximity order po.
func syncStreams(po, depth, maxPO int) (streams []string) {
start, end := syncBins(po, depth, maxPO)
for bin := start; bin < end; bin++ {
streams = append(streams, NewStream("SYNC", FormatSyncBinKey(uint8(bin)), false).String())
streams = append(streams, NewStream("SYNC", FormatSyncBinKey(uint8(bin)), true).String())
}
return streams
}
// nodeStreams returns stream server subscriptions on a registry
// to the peer with provided id.
func nodeStreams(r *Registry, id string) []string {
streams := r.api.GetPeerServerSubscriptions()[id]
sort.Strings(streams)
return streams
}
