404 lines
11 KiB
Go
404 lines
11 KiB
Go
package discover
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import (
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"crypto/ecdsa"
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"errors"
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"fmt"
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"math/big"
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"math/rand"
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"net"
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"reflect"
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"testing"
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"testing/quick"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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)
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var (
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quickrand = rand.New(rand.NewSource(time.Now().Unix()))
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quickcfg = &quick.Config{MaxCount: 5000, Rand: quickrand}
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)
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func TestHexID(t *testing.T) {
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ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
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id1 := HexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
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id2 := HexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
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if id1 != ref {
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t.Errorf("wrong id1\ngot %v\nwant %v", id1[:], ref[:])
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}
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if id2 != ref {
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t.Errorf("wrong id2\ngot %v\nwant %v", id2[:], ref[:])
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}
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}
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func TestNodeID_recover(t *testing.T) {
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prv := newkey()
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hash := make([]byte, 32)
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sig, err := crypto.Sign(hash, prv)
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if err != nil {
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t.Fatalf("signing error: %v", err)
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}
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pub := newNodeID(prv)
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recpub, err := recoverNodeID(hash, sig)
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if err != nil {
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t.Fatalf("recovery error: %v", err)
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}
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if pub != recpub {
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t.Errorf("recovered wrong pubkey:\ngot: %v\nwant: %v", recpub, pub)
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}
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}
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func TestNodeID_distcmp(t *testing.T) {
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distcmpBig := func(target, a, b NodeID) int {
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tbig := new(big.Int).SetBytes(target[:])
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abig := new(big.Int).SetBytes(a[:])
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bbig := new(big.Int).SetBytes(b[:])
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return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
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}
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if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg); err != nil {
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t.Error(err)
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}
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}
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// the random tests is likely to miss the case where they're equal.
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func TestNodeID_distcmpEqual(t *testing.T) {
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base := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
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x := NodeID{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
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if distcmp(base, x, x) != 0 {
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t.Errorf("distcmp(base, x, x) != 0")
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}
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}
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func TestNodeID_logdist(t *testing.T) {
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logdistBig := func(a, b NodeID) int {
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abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
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return new(big.Int).Xor(abig, bbig).BitLen()
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}
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if err := quick.CheckEqual(logdist, logdistBig, quickcfg); err != nil {
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t.Error(err)
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}
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}
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// the random tests is likely to miss the case where they're equal.
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func TestNodeID_logdistEqual(t *testing.T) {
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x := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
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if logdist(x, x) != 0 {
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t.Errorf("logdist(x, x) != 0")
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}
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}
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func TestNodeID_randomID(t *testing.T) {
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// we don't use quick.Check here because its output isn't
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// very helpful when the test fails.
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for i := 0; i < quickcfg.MaxCount; i++ {
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a := gen(NodeID{}, quickrand).(NodeID)
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dist := quickrand.Intn(len(NodeID{}) * 8)
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result := randomID(a, dist)
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actualdist := logdist(result, a)
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if dist != actualdist {
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t.Log("a: ", a)
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t.Log("result:", result)
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t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
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}
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}
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}
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func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
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var id NodeID
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m := rand.Intn(len(id))
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for i := len(id) - 1; i > m; i-- {
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id[i] = byte(rand.Uint32())
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}
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return reflect.ValueOf(id)
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}
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func TestTable_bumpOrAddPingReplace(t *testing.T) {
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pingC := make(pingC)
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tab := newTable(pingC, NodeID{}, &net.UDPAddr{})
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last := fillBucket(tab, 200)
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// this bumpOrAdd should not replace the last node
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// because the node replies to ping.
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new := tab.bumpOrAdd(randomID(tab.self.ID, 200), nil)
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pinged := <-pingC
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if pinged != last.ID {
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t.Fatalf("pinged wrong node: %v\nwant %v", pinged, last.ID)
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}
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tab.mutex.Lock()
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defer tab.mutex.Unlock()
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if l := len(tab.buckets[200].entries); l != bucketSize {
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t.Errorf("wrong bucket size after bumpOrAdd: got %d, want %d", bucketSize, l)
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}
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if !contains(tab.buckets[200].entries, last.ID) {
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t.Error("last entry was removed")
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}
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if contains(tab.buckets[200].entries, new.ID) {
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t.Error("new entry was added")
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}
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}
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func TestTable_bumpOrAddPingTimeout(t *testing.T) {
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tab := newTable(pingC(nil), NodeID{}, &net.UDPAddr{})
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last := fillBucket(tab, 200)
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// this bumpOrAdd should replace the last node
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// because the node does not reply to ping.
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new := tab.bumpOrAdd(randomID(tab.self.ID, 200), nil)
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// wait for async bucket update. damn. this needs to go away.
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time.Sleep(2 * time.Millisecond)
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tab.mutex.Lock()
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defer tab.mutex.Unlock()
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if l := len(tab.buckets[200].entries); l != bucketSize {
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t.Errorf("wrong bucket size after bumpOrAdd: got %d, want %d", bucketSize, l)
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}
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if contains(tab.buckets[200].entries, last.ID) {
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t.Error("last entry was not removed")
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}
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if !contains(tab.buckets[200].entries, new.ID) {
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t.Error("new entry was not added")
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}
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}
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func fillBucket(tab *Table, ld int) (last *Node) {
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b := tab.buckets[ld]
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for len(b.entries) < bucketSize {
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b.entries = append(b.entries, &Node{ID: randomID(tab.self.ID, ld)})
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}
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return b.entries[bucketSize-1]
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}
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type pingC chan NodeID
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func (t pingC) findnode(n *Node, target NodeID) ([]*Node, error) {
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panic("findnode called on pingRecorder")
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}
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func (t pingC) close() {
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panic("close called on pingRecorder")
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}
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func (t pingC) ping(n *Node) error {
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if t == nil {
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return errTimeout
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}
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t <- n.ID
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return nil
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}
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func TestTable_bump(t *testing.T) {
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tab := newTable(nil, NodeID{}, &net.UDPAddr{})
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// add an old entry and two recent ones
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oldactive := time.Now().Add(-2 * time.Minute)
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old := &Node{ID: randomID(tab.self.ID, 200), active: oldactive}
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others := []*Node{
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&Node{ID: randomID(tab.self.ID, 200), active: time.Now()},
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&Node{ID: randomID(tab.self.ID, 200), active: time.Now()},
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}
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tab.add(append(others, old))
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if tab.buckets[200].entries[0] == old {
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t.Fatal("old entry is at front of bucket")
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}
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// bumping the old entry should move it to the front
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tab.bump(old.ID)
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if old.active == oldactive {
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t.Error("activity timestamp not updated")
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}
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if tab.buckets[200].entries[0] != old {
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t.Errorf("bumped entry did not move to the front of bucket")
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}
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}
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func TestTable_closest(t *testing.T) {
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t.Parallel()
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test := func(test *closeTest) bool {
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// for any node table, Target and N
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tab := newTable(nil, test.Self, &net.UDPAddr{})
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tab.add(test.All)
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// check that doClosest(Target, N) returns nodes
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result := tab.closest(test.Target, test.N).entries
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if hasDuplicates(result) {
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t.Errorf("result contains duplicates")
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return false
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}
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if !sortedByDistanceTo(test.Target, result) {
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t.Errorf("result is not sorted by distance to target")
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return false
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}
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// check that the number of results is min(N, tablen)
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wantN := test.N
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if tlen := tab.len(); tlen < test.N {
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wantN = tlen
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}
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if len(result) != wantN {
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t.Errorf("wrong number of nodes: got %d, want %d", len(result), wantN)
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return false
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} else if len(result) == 0 {
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return true // no need to check distance
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}
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// check that the result nodes have minimum distance to target.
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for _, b := range tab.buckets {
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for _, n := range b.entries {
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if contains(result, n.ID) {
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continue // don't run the check below for nodes in result
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}
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farthestResult := result[len(result)-1].ID
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if distcmp(test.Target, n.ID, farthestResult) < 0 {
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t.Errorf("table contains node that is closer to target but it's not in result")
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t.Logf(" Target: %v", test.Target)
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t.Logf(" Farthest Result: %v", farthestResult)
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t.Logf(" ID: %v", n.ID)
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return false
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}
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}
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}
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return true
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}
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if err := quick.Check(test, quickcfg); err != nil {
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t.Error(err)
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}
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}
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type closeTest struct {
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Self NodeID
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Target NodeID
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All []*Node
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N int
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}
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func (*closeTest) Generate(rand *rand.Rand, size int) reflect.Value {
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t := &closeTest{
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Self: gen(NodeID{}, rand).(NodeID),
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Target: gen(NodeID{}, rand).(NodeID),
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N: rand.Intn(bucketSize),
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}
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for _, id := range gen([]NodeID{}, rand).([]NodeID) {
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t.All = append(t.All, &Node{ID: id})
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}
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return reflect.ValueOf(t)
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}
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func TestTable_Lookup(t *testing.T) {
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self := gen(NodeID{}, quickrand).(NodeID)
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target := randomID(self, 200)
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transport := findnodeOracle{t, target}
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tab := newTable(transport, self, &net.UDPAddr{})
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// lookup on empty table returns no nodes
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if results := tab.Lookup(target); len(results) > 0 {
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t.Fatalf("lookup on empty table returned %d results: %#v", len(results), results)
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}
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// seed table with initial node (otherwise lookup will terminate immediately)
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tab.bumpOrAdd(randomID(target, 200), &net.UDPAddr{Port: 200})
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results := tab.Lookup(target)
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t.Logf("results:")
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for _, e := range results {
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t.Logf(" ld=%d, %v", logdist(target, e.ID), e.ID)
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}
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if len(results) != bucketSize {
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t.Errorf("wrong number of results: got %d, want %d", len(results), bucketSize)
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}
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if hasDuplicates(results) {
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t.Errorf("result set contains duplicate entries")
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}
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if !sortedByDistanceTo(target, results) {
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t.Errorf("result set not sorted by distance to target")
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}
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if !contains(results, target) {
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t.Errorf("result set does not contain target")
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}
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}
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// findnode on this transport always returns at least one node
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// that is one bucket closer to the target.
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type findnodeOracle struct {
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t *testing.T
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target NodeID
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}
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func (t findnodeOracle) findnode(n *Node, target NodeID) ([]*Node, error) {
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t.t.Logf("findnode query at dist %d", n.Addr.Port)
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// current log distance is encoded in port number
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var result []*Node
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switch port := n.Addr.Port; port {
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case 0:
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panic("query to node at distance 0")
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case 1:
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result = append(result, &Node{ID: t.target, Addr: &net.UDPAddr{Port: 0}})
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default:
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// TODO: add more randomness to distances
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port--
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for i := 0; i < bucketSize; i++ {
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result = append(result, &Node{ID: randomID(t.target, port), Addr: &net.UDPAddr{Port: port}})
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}
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}
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return result, nil
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}
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func (t findnodeOracle) close() {}
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func (t findnodeOracle) ping(n *Node) error {
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return errors.New("ping is not supported by this transport")
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}
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func hasDuplicates(slice []*Node) bool {
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seen := make(map[NodeID]bool)
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for _, e := range slice {
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if seen[e.ID] {
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return true
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}
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seen[e.ID] = true
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}
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return false
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}
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func sortedByDistanceTo(distbase NodeID, slice []*Node) bool {
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var last NodeID
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for i, e := range slice {
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if i > 0 && distcmp(distbase, e.ID, last) < 0 {
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return false
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}
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last = e.ID
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}
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return true
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}
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func contains(ns []*Node, id NodeID) bool {
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for _, n := range ns {
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if n.ID == id {
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return true
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}
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}
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return false
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}
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// gen wraps quick.Value so it's easier to use.
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// it generates a random value of the given value's type.
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func gen(typ interface{}, rand *rand.Rand) interface{} {
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v, ok := quick.Value(reflect.TypeOf(typ), rand)
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if !ok {
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panic(fmt.Sprintf("couldn't generate random value of type %T", typ))
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}
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return v.Interface()
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}
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func newkey() *ecdsa.PrivateKey {
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key, err := crypto.GenerateKey()
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if err != nil {
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panic("couldn't generate key: " + err.Error())
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}
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return key
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}
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