go-pulse/p2p/discover/table_test.go
2015-04-24 11:23:20 +03:00

324 lines
8.5 KiB
Go

package discover
import (
"crypto/ecdsa"
"fmt"
"math/rand"
"net"
"reflect"
"testing"
"testing/quick"
"github.com/ethereum/go-ethereum/crypto"
)
func TestTable_pingReplace(t *testing.T) {
doit := func(newNodeIsResponding, lastInBucketIsResponding bool) {
transport := newPingRecorder()
tab := newTable(transport, NodeID{}, &net.UDPAddr{}, "")
last := fillBucket(tab, 200)
pingSender := randomID(tab.self.ID, 200)
// this gotPing should replace the last node
// if the last node is not responding.
transport.responding[last.ID] = lastInBucketIsResponding
transport.responding[pingSender] = newNodeIsResponding
tab.bond(true, pingSender, &net.UDPAddr{}, 0)
// first ping goes to sender (bonding pingback)
if !transport.pinged[pingSender] {
t.Error("table did not ping back sender")
}
if newNodeIsResponding {
// second ping goes to oldest node in bucket
// to see whether it is still alive.
if !transport.pinged[last.ID] {
t.Error("table did not ping last node in bucket")
}
}
tab.mutex.Lock()
defer tab.mutex.Unlock()
if l := len(tab.buckets[200].entries); l != bucketSize {
t.Errorf("wrong bucket size after gotPing: got %d, want %d", bucketSize, l)
}
if lastInBucketIsResponding || !newNodeIsResponding {
if !contains(tab.buckets[200].entries, last.ID) {
t.Error("last entry was removed")
}
if contains(tab.buckets[200].entries, pingSender) {
t.Error("new entry was added")
}
} else {
if contains(tab.buckets[200].entries, last.ID) {
t.Error("last entry was not removed")
}
if !contains(tab.buckets[200].entries, pingSender) {
t.Error("new entry was not added")
}
}
}
doit(true, true)
doit(false, true)
doit(false, true)
doit(false, false)
}
func TestBucket_bumpNoDuplicates(t *testing.T) {
t.Parallel()
cfg := &quick.Config{
MaxCount: 1000,
Rand: quickrand,
Values: func(args []reflect.Value, rand *rand.Rand) {
// generate a random list of nodes. this will be the content of the bucket.
n := rand.Intn(bucketSize-1) + 1
nodes := make([]*Node, n)
for i := range nodes {
nodes[i] = &Node{ID: randomID(NodeID{}, 200)}
}
args[0] = reflect.ValueOf(nodes)
// generate random bump positions.
bumps := make([]int, rand.Intn(100))
for i := range bumps {
bumps[i] = rand.Intn(len(nodes))
}
args[1] = reflect.ValueOf(bumps)
},
}
prop := func(nodes []*Node, bumps []int) (ok bool) {
b := &bucket{entries: make([]*Node, len(nodes))}
copy(b.entries, nodes)
for i, pos := range bumps {
b.bump(b.entries[pos])
if hasDuplicates(b.entries) {
t.Logf("bucket has duplicates after %d/%d bumps:", i+1, len(bumps))
for _, n := range b.entries {
t.Logf(" %p", n)
}
return false
}
}
return true
}
if err := quick.Check(prop, cfg); err != nil {
t.Error(err)
}
}
func fillBucket(tab *Table, ld int) (last *Node) {
b := tab.buckets[ld]
for len(b.entries) < bucketSize {
b.entries = append(b.entries, &Node{ID: randomID(tab.self.ID, ld)})
}
return b.entries[bucketSize-1]
}
type pingRecorder struct{ responding, pinged map[NodeID]bool }
func newPingRecorder() *pingRecorder {
return &pingRecorder{make(map[NodeID]bool), make(map[NodeID]bool)}
}
func (t *pingRecorder) findnode(toid NodeID, toaddr *net.UDPAddr, target NodeID) ([]*Node, error) {
panic("findnode called on pingRecorder")
}
func (t *pingRecorder) close() {
panic("close called on pingRecorder")
}
func (t *pingRecorder) waitping(from NodeID) error {
return nil // remote always pings
}
func (t *pingRecorder) ping(toid NodeID, toaddr *net.UDPAddr) error {
t.pinged[toid] = true
if t.responding[toid] {
return nil
} else {
return errTimeout
}
}
func TestTable_closest(t *testing.T) {
t.Parallel()
test := func(test *closeTest) bool {
// for any node table, Target and N
tab := newTable(nil, test.Self, &net.UDPAddr{}, "")
tab.add(test.All)
// check that doClosest(Target, N) returns nodes
result := tab.closest(test.Target, test.N).entries
if hasDuplicates(result) {
t.Errorf("result contains duplicates")
return false
}
if !sortedByDistanceTo(test.Target, result) {
t.Errorf("result is not sorted by distance to target")
return false
}
// check that the number of results is min(N, tablen)
wantN := test.N
if tlen := tab.len(); tlen < test.N {
wantN = tlen
}
if len(result) != wantN {
t.Errorf("wrong number of nodes: got %d, want %d", len(result), wantN)
return false
} else if len(result) == 0 {
return true // no need to check distance
}
// check that the result nodes have minimum distance to target.
for _, b := range tab.buckets {
for _, n := range b.entries {
if contains(result, n.ID) {
continue // don't run the check below for nodes in result
}
farthestResult := result[len(result)-1].ID
if distcmp(test.Target, n.ID, farthestResult) < 0 {
t.Errorf("table contains node that is closer to target but it's not in result")
t.Logf(" Target: %v", test.Target)
t.Logf(" Farthest Result: %v", farthestResult)
t.Logf(" ID: %v", n.ID)
return false
}
}
}
return true
}
if err := quick.Check(test, quickcfg); err != nil {
t.Error(err)
}
}
type closeTest struct {
Self NodeID
Target NodeID
All []*Node
N int
}
func (*closeTest) Generate(rand *rand.Rand, size int) reflect.Value {
t := &closeTest{
Self: gen(NodeID{}, rand).(NodeID),
Target: gen(NodeID{}, rand).(NodeID),
N: rand.Intn(bucketSize),
}
for _, id := range gen([]NodeID{}, rand).([]NodeID) {
t.All = append(t.All, &Node{ID: id})
}
return reflect.ValueOf(t)
}
func TestTable_Lookup(t *testing.T) {
self := gen(NodeID{}, quickrand).(NodeID)
target := randomID(self, 200)
transport := findnodeOracle{t, target}
tab := newTable(transport, self, &net.UDPAddr{}, "")
// lookup on empty table returns no nodes
if results := tab.Lookup(target); len(results) > 0 {
t.Fatalf("lookup on empty table returned %d results: %#v", len(results), results)
}
// seed table with initial node (otherwise lookup will terminate immediately)
tab.add([]*Node{newNode(randomID(target, 200), &net.UDPAddr{Port: 200})})
results := tab.Lookup(target)
t.Logf("results:")
for _, e := range results {
t.Logf(" ld=%d, %v", logdist(target, e.ID), e.ID)
}
if len(results) != bucketSize {
t.Errorf("wrong number of results: got %d, want %d", len(results), bucketSize)
}
if hasDuplicates(results) {
t.Errorf("result set contains duplicate entries")
}
if !sortedByDistanceTo(target, results) {
t.Errorf("result set not sorted by distance to target")
}
if !contains(results, target) {
t.Errorf("result set does not contain target")
}
}
// findnode on this transport always returns at least one node
// that is one bucket closer to the target.
type findnodeOracle struct {
t *testing.T
target NodeID
}
func (t findnodeOracle) findnode(toid NodeID, toaddr *net.UDPAddr, target NodeID) ([]*Node, error) {
t.t.Logf("findnode query at dist %d", toaddr.Port)
// current log distance is encoded in port number
var result []*Node
switch toaddr.Port {
case 0:
panic("query to node at distance 0")
default:
// TODO: add more randomness to distances
next := toaddr.Port - 1
for i := 0; i < bucketSize; i++ {
result = append(result, &Node{ID: randomID(t.target, next), DiscPort: next})
}
}
return result, nil
}
func (t findnodeOracle) close() {}
func (t findnodeOracle) waitping(from NodeID) error { return nil }
func (t findnodeOracle) ping(toid NodeID, toaddr *net.UDPAddr) error { return nil }
func hasDuplicates(slice []*Node) bool {
seen := make(map[NodeID]bool)
for _, e := range slice {
if seen[e.ID] {
return true
}
seen[e.ID] = true
}
return false
}
func sortedByDistanceTo(distbase NodeID, slice []*Node) bool {
var last NodeID
for i, e := range slice {
if i > 0 && distcmp(distbase, e.ID, last) < 0 {
return false
}
last = e.ID
}
return true
}
func contains(ns []*Node, id NodeID) bool {
for _, n := range ns {
if n.ID == id {
return true
}
}
return false
}
// gen wraps quick.Value so it's easier to use.
// it generates a random value of the given value's type.
func gen(typ interface{}, rand *rand.Rand) interface{} {
v, ok := quick.Value(reflect.TypeOf(typ), rand)
if !ok {
panic(fmt.Sprintf("couldn't generate random value of type %T", typ))
}
return v.Interface()
}
func newkey() *ecdsa.PrivateKey {
key, err := crypto.GenerateKey()
if err != nil {
panic("couldn't generate key: " + err.Error())
}
return key
}