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package pex
import (
"encoding/hex"
"fmt"
"io/ioutil"
"math"
"net"
"os"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/libs/log"
tmmath "github.com/tendermint/tendermint/libs/math"
tmrand "github.com/tendermint/tendermint/libs/rand"
"github.com/tendermint/tendermint/p2p"
)
// FIXME These tests should not rely on .(*addrBook) assertions
func TestAddrBookPickAddress(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
// 0 addresses
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
assert.Zero(t, book.Size())
addr := book.PickAddress(50)
assert.Nil(t, addr, "expected no address")
randAddrs := randNetAddressPairs(t, 1)
addrSrc := randAddrs[0]
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
// pick an address when we only have new address
addr = book.PickAddress(0)
assert.NotNil(t, addr, "expected an address")
addr = book.PickAddress(50)
assert.NotNil(t, addr, "expected an address")
addr = book.PickAddress(100)
assert.NotNil(t, addr, "expected an address")
// pick an address when we only have old address
book.MarkGood(addrSrc.addr.ID)
addr = book.PickAddress(0)
assert.NotNil(t, addr, "expected an address")
addr = book.PickAddress(50)
assert.NotNil(t, addr, "expected an address")
// in this case, nNew==0 but we biased 100% to new, so we return nil
addr = book.PickAddress(100)
assert.Nil(t, addr, "did not expected an address")
}
func TestAddrBookSaveLoad(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
// 0 addresses
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
book.Save()
book = NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
err := book.Start()
require.NoError(t, err)
assert.True(t, book.Empty())
// 100 addresses
randAddrs := randNetAddressPairs(t, 100)
for _, addrSrc := range randAddrs {
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
}
assert.Equal(t, 100, book.Size())
book.Save()
book = NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
err = book.Start()
require.NoError(t, err)
assert.Equal(t, 100, book.Size())
}
func TestAddrBookLookup(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
randAddrs := randNetAddressPairs(t, 100)
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
for _, addrSrc := range randAddrs {
addr := addrSrc.addr
src := addrSrc.src
err := book.AddAddress(addr, src)
require.NoError(t, err)
ka := book.HasAddress(addr)
assert.True(t, ka, "Expected to find KnownAddress %v but wasn't there.", addr)
}
}
func TestAddrBookPromoteToOld(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
randAddrs := randNetAddressPairs(t, 100)
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
for _, addrSrc := range randAddrs {
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
}
// Attempt all addresses.
for _, addrSrc := range randAddrs {
book.MarkAttempt(addrSrc.addr)
}
// Promote half of them
for i, addrSrc := range randAddrs {
if i%2 == 0 {
book.MarkGood(addrSrc.addr.ID)
}
}
// TODO: do more testing :)
selection := book.GetSelection()
t.Logf("selection: %v", selection)
if len(selection) > book.Size() {
t.Errorf("selection could not be bigger than the book")
}
selection = book.GetSelectionWithBias(30)
t.Logf("selection: %v", selection)
if len(selection) > book.Size() {
t.Errorf("selection with bias could not be bigger than the book")
}
assert.Equal(t, book.Size(), 100, "expecting book size to be 100")
}
func TestAddrBookHandlesDuplicates(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
randAddrs := randNetAddressPairs(t, 100)
differentSrc := randIPv4Address(t)
for _, addrSrc := range randAddrs {
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
err = book.AddAddress(addrSrc.addr, addrSrc.src) // duplicate
require.NoError(t, err)
err = book.AddAddress(addrSrc.addr, differentSrc) // different src
require.NoError(t, err)
}
assert.Equal(t, 100, book.Size())
}
type netAddressPair struct {
addr *p2p.NetAddress
src *p2p.NetAddress
}
func randNetAddressPairs(t *testing.T, n int) []netAddressPair {
randAddrs := make([]netAddressPair, n)
for i := 0; i < n; i++ {
randAddrs[i] = netAddressPair{addr: randIPv4Address(t), src: randIPv4Address(t)}
}
return randAddrs
}
func randIPv4Address(t *testing.T) *p2p.NetAddress {
for {
ip := fmt.Sprintf("%v.%v.%v.%v",
tmrand.Intn(254)+1,
tmrand.Intn(255),
tmrand.Intn(255),
tmrand.Intn(255),
)
port := tmrand.Intn(65535-1) + 1
id := p2p.ID(hex.EncodeToString(tmrand.Bytes(p2p.IDByteLength)))
idAddr := p2p.IDAddressString(id, fmt.Sprintf("%v:%v", ip, port))
addr, err := p2p.NewNetAddressString(idAddr)
assert.Nil(t, err, "error generating rand network address")
if addr.Routable() {
return addr
}
}
}
func TestAddrBookRemoveAddress(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
addr := randIPv4Address(t)
err := book.AddAddress(addr, addr)
require.NoError(t, err)
assert.Equal(t, 1, book.Size())
book.RemoveAddress(addr)
assert.Equal(t, 0, book.Size())
nonExistingAddr := randIPv4Address(t)
book.RemoveAddress(nonExistingAddr)
assert.Equal(t, 0, book.Size())
}
func TestAddrBookGetSelectionWithOneMarkedGood(t *testing.T) {
// create a book with 10 addresses, 1 good/old and 9 new
book, _ := createAddrBookWithMOldAndNNewAddrs(t, 1, 9)
addrs := book.GetSelectionWithBias(biasToSelectNewPeers)
assert.NotNil(t, addrs)
assertMOldAndNNewAddrsInSelection(t, 1, 9, addrs, book)
}
func TestAddrBookGetSelectionWithOneNotMarkedGood(t *testing.T) {
// create a book with 10 addresses, 9 good/old and 1 new
book, _ := createAddrBookWithMOldAndNNewAddrs(t, 9, 1)
addrs := book.GetSelectionWithBias(biasToSelectNewPeers)
assert.NotNil(t, addrs)
assertMOldAndNNewAddrsInSelection(t, 9, 1, addrs, book)
}
func TestAddrBookGetSelectionReturnsNilWhenAddrBookIsEmpty(t *testing.T) {
book, _ := createAddrBookWithMOldAndNNewAddrs(t, 0, 0)
addrs := book.GetSelectionWithBias(biasToSelectNewPeers)
assert.Nil(t, addrs)
}
func TestAddrBookGetSelection(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
// 1) empty book
assert.Empty(t, book.GetSelection())
// 2) add one address
addr := randIPv4Address(t)
err := book.AddAddress(addr, addr)
require.NoError(t, err)
assert.Equal(t, 1, len(book.GetSelection()))
assert.Equal(t, addr, book.GetSelection()[0])
// 3) add a bunch of addresses
randAddrs := randNetAddressPairs(t, 100)
for _, addrSrc := range randAddrs {
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
}
// check there is no duplicates
addrs := make(map[string]*p2p.NetAddress)
selection := book.GetSelection()
for _, addr := range selection {
if dup, ok := addrs[addr.String()]; ok {
t.Fatalf("selection %v contains duplicates %v", selection, dup)
}
addrs[addr.String()] = addr
}
if len(selection) > book.Size() {
t.Errorf("selection %v could not be bigger than the book", selection)
}
}
func TestAddrBookGetSelectionWithBias(t *testing.T) {
const biasTowardsNewAddrs = 30
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
// 1) empty book
selection := book.GetSelectionWithBias(biasTowardsNewAddrs)
assert.Empty(t, selection)
// 2) add one address
addr := randIPv4Address(t)
err := book.AddAddress(addr, addr)
require.NoError(t, err)
selection = book.GetSelectionWithBias(biasTowardsNewAddrs)
assert.Equal(t, 1, len(selection))
assert.Equal(t, addr, selection[0])
// 3) add a bunch of addresses
randAddrs := randNetAddressPairs(t, 100)
for _, addrSrc := range randAddrs {
err := book.AddAddress(addrSrc.addr, addrSrc.src)
require.NoError(t, err)
}
// check there is no duplicates
addrs := make(map[string]*p2p.NetAddress)
selection = book.GetSelectionWithBias(biasTowardsNewAddrs)
for _, addr := range selection {
if dup, ok := addrs[addr.String()]; ok {
t.Fatalf("selection %v contains duplicates %v", selection, dup)
}
addrs[addr.String()] = addr
}
if len(selection) > book.Size() {
t.Fatalf("selection %v could not be bigger than the book", selection)
}
// 4) mark 80% of the addresses as good
randAddrsLen := len(randAddrs)
for i, addrSrc := range randAddrs {
if int((float64(i)/float64(randAddrsLen))*100) >= 20 {
book.MarkGood(addrSrc.addr.ID)
}
}
selection = book.GetSelectionWithBias(biasTowardsNewAddrs)
// check that ~70% of addresses returned are good
good := 0
for _, addr := range selection {
if book.IsGood(addr) {
good++
}
}
got, expected := int((float64(good)/float64(len(selection)))*100), 100-biasTowardsNewAddrs
// compute some slack to protect against small differences due to rounding:
slack := int(math.Round(float64(100) / float64(len(selection))))
if got > expected+slack {
t.Fatalf(
"got more good peers (%% got: %d, %% expected: %d, number of good addrs: %d, total: %d)",
got,
expected,
good,
len(selection),
)
}
if got < expected-slack {
t.Fatalf(
"got fewer good peers (%% got: %d, %% expected: %d, number of good addrs: %d, total: %d)",
got,
expected,
good,
len(selection),
)
}
}
func TestAddrBookHasAddress(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
addr := randIPv4Address(t)
err := book.AddAddress(addr, addr)
require.NoError(t, err)
assert.True(t, book.HasAddress(addr))
book.RemoveAddress(addr)
assert.False(t, book.HasAddress(addr))
}
func testCreatePrivateAddrs(t *testing.T, numAddrs int) ([]*p2p.NetAddress, []string) {
t.Helper()
addrs := make([]*p2p.NetAddress, numAddrs)
for i := 0; i < numAddrs; i++ {
addrs[i] = randIPv4Address(t)
}
private := make([]string, numAddrs)
for i, addr := range addrs {
private[i] = string(addr.ID)
}
return addrs, private
}
func TestBanBadPeers(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
addr := randIPv4Address(t)
_ = book.AddAddress(addr, addr)
book.MarkBad(addr, 1*time.Second)
// addr should not reachable
assert.False(t, book.HasAddress(addr))
assert.True(t, book.IsBanned(addr))
err := book.AddAddress(addr, addr)
// book should not add address from the blacklist
assert.Error(t, err)
time.Sleep(1 * time.Second)
book.ReinstateBadPeers()
// address should be reinstated in the new bucket
assert.EqualValues(t, 1, book.Size())
assert.True(t, book.HasAddress(addr))
assert.False(t, book.IsGood(addr))
}
func TestAddrBookEmpty(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
// Check that empty book is empty
require.True(t, book.Empty())
// Check that book with our address is empty
book.AddOurAddress(randIPv4Address(t))
require.True(t, book.Empty())
// Check that book with private addrs is empty
_, privateIds := testCreatePrivateAddrs(t, 5)
book.AddPrivateIDs(privateIds)
require.True(t, book.Empty())
// Check that book with address is not empty
err := book.AddAddress(randIPv4Address(t), randIPv4Address(t))
require.NoError(t, err)
require.False(t, book.Empty())
}
func TestPrivatePeers(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
addrs, private := testCreatePrivateAddrs(t, 10)
book.AddPrivateIDs(private)
// private addrs must not be added
for _, addr := range addrs {
err := book.AddAddress(addr, addr)
if assert.Error(t, err) {
_, ok := err.(ErrAddrBookPrivate)
assert.True(t, ok)
}
}
// addrs coming from private peers must not be added
err := book.AddAddress(randIPv4Address(t), addrs[0])
if assert.Error(t, err) {
_, ok := err.(ErrAddrBookPrivateSrc)
assert.True(t, ok)
}
}
func testAddrBookAddressSelection(t *testing.T, bookSize int) {
// generate all combinations of old (m) and new addresses
for nBookOld := 0; nBookOld <= bookSize; nBookOld++ {
nBookNew := bookSize - nBookOld
dbgStr := fmt.Sprintf("book of size %d (new %d, old %d)", bookSize, nBookNew, nBookOld)
// create book and get selection
book, _ := createAddrBookWithMOldAndNNewAddrs(t, nBookOld, nBookNew)
addrs := book.GetSelectionWithBias(biasToSelectNewPeers)
assert.NotNil(t, addrs, "%s - expected a non-nil selection", dbgStr)
nAddrs := len(addrs)
assert.NotZero(t, nAddrs, "%s - expected at least one address in selection", dbgStr)
// check there's no nil addresses
for _, addr := range addrs {
if addr == nil {
t.Fatalf("%s - got nil address in selection %v", dbgStr, addrs)
}
}
// XXX: shadowing
nOld, nNew := countOldAndNewAddrsInSelection(addrs, book)
// Given:
// n - num new addrs, m - num old addrs
// k - num new addrs expected in the beginning (based on bias %)
// i=min(n, max(k,r-m)), aka expNew
// j=min(m, r-i), aka expOld
//
// We expect this layout:
// indices: 0...i-1 i...i+j-1
// addresses: N0..Ni-1 O0..Oj-1
//
// There is at least one partition and at most three.
var (
k = percentageOfNum(biasToSelectNewPeers, nAddrs)
expNew = tmmath.MinInt(nNew, tmmath.MaxInt(k, nAddrs-nBookOld))
expOld = tmmath.MinInt(nOld, nAddrs-expNew)
)
// Verify that the number of old and new addresses are as expected
if nNew != expNew {
t.Fatalf("%s - expected new addrs %d, got %d", dbgStr, expNew, nNew)
}
if nOld != expOld {
t.Fatalf("%s - expected old addrs %d, got %d", dbgStr, expOld, nOld)
}
// Verify that the order of addresses is as expected
// Get the sequence types and lengths of the selection
seqLens, seqTypes, err := analyseSelectionLayout(book, addrs)
assert.NoError(t, err, "%s", dbgStr)
// Build a list with the expected lengths of partitions and another with the expected types, e.g.:
// expSeqLens = [10, 22], expSeqTypes = [1, 2]
// means we expect 10 new (type 1) addresses followed by 22 old (type 2) addresses.
var expSeqLens []int
var expSeqTypes []int
switch {
case expOld == 0: // all new addresses
expSeqLens = []int{nAddrs}
expSeqTypes = []int{1}
case expNew == 0: // all old addresses
expSeqLens = []int{nAddrs}
expSeqTypes = []int{2}
case nAddrs-expNew-expOld == 0: // new addresses, old addresses
expSeqLens = []int{expNew, expOld}
expSeqTypes = []int{1, 2}
}
assert.Equal(t, expSeqLens, seqLens,
"%s - expected sequence lengths of old/new %v, got %v",
dbgStr, expSeqLens, seqLens)
assert.Equal(t, expSeqTypes, seqTypes,
"%s - expected sequence types (1-new, 2-old) was %v, got %v",
dbgStr, expSeqTypes, seqTypes)
}
}
func TestMultipleAddrBookAddressSelection(t *testing.T) {
// test books with smaller size, < N
const N = 32
for bookSize := 1; bookSize < N; bookSize++ {
testAddrBookAddressSelection(t, bookSize)
}
// Test for two books with sizes from following ranges
ranges := [...][]int{{33, 100}, {100, 175}}
bookSizes := make([]int, 0, len(ranges))
for _, r := range ranges {
bookSizes = append(bookSizes, tmrand.Intn(r[1]-r[0])+r[0])
}
t.Logf("Testing address selection for the following book sizes %v\n", bookSizes)
for _, bookSize := range bookSizes {
testAddrBookAddressSelection(t, bookSize)
}
}
func TestAddrBookAddDoesNotOverwriteOldIP(t *testing.T) {
fname := createTempFileName(t, "addrbook_test")
// This test creates adds a peer to the address book and marks it good
// It then attempts to override the peer's IP, by adding a peer with the same ID
// but different IP. We distinguish the IP's by "RealIP" and "OverrideAttemptIP"
peerID := "678503e6c8f50db7279c7da3cb9b072aac4bc0d5"
peerRealIP := "1.1.1.1:26656"
peerOverrideAttemptIP := "2.2.2.2:26656"
SrcAddr := "b0dd378c3fbc4c156cd6d302a799f0d2e4227201@159.89.121.174:26656"
// There is a chance that AddAddress will ignore the new peer its given.
// So we repeat trying to override the peer several times,
// to ensure we aren't in a case that got probabilistically ignored
numOverrideAttempts := 10
peerRealAddr, err := p2p.NewNetAddressString(peerID + "@" + peerRealIP)
require.Nil(t, err)
peerOverrideAttemptAddr, err := p2p.NewNetAddressString(peerID + "@" + peerOverrideAttemptIP)
require.Nil(t, err)
src, err := p2p.NewNetAddressString(SrcAddr)
require.Nil(t, err)
book := NewAddrBook(fname, true)
book.SetLogger(log.TestingLogger())
err = book.AddAddress(peerRealAddr, src)
require.Nil(t, err)
book.MarkAttempt(peerRealAddr)
book.MarkGood(peerRealAddr.ID)
// Double check that adding a peer again doesn't error
err = book.AddAddress(peerRealAddr, src)
require.Nil(t, err)
// Try changing ip but keeping the same node id. (change 1.1.1.1 to 2.2.2.2)
// This should just be ignored, and not error.
for i := 0; i < numOverrideAttempts; i++ {
err = book.AddAddress(peerOverrideAttemptAddr, src)
require.Nil(t, err)
}
// Now check that the IP was not overridden.
// This is done by sampling several peers from addr book
// and ensuring they all have the correct IP.
// In the expected functionality, this test should only have 1 Peer, hence will pass.
for i := 0; i < numOverrideAttempts; i++ {
selection := book.GetSelection()
for _, addr := range selection {
require.Equal(t, addr.IP, peerRealAddr.IP)
}
}
}
func TestAddrBookGroupKey(t *testing.T) {
// non-strict routability
testCases := []struct {
name string
ip string
expKey string
}{
// IPv4 normal.
{"ipv4 normal class a", "12.1.2.3", "12.1.0.0"},
{"ipv4 normal class b", "173.1.2.3", "173.1.0.0"},
{"ipv4 normal class c", "196.1.2.3", "196.1.0.0"},
// IPv6/IPv4 translations.
{"ipv6 rfc3964 with ipv4 encap", "2002:0c01:0203::", "12.1.0.0"},
{"ipv6 rfc4380 toredo ipv4", "2001:0:1234::f3fe:fdfc", "12.1.0.0"},
{"ipv6 rfc6052 well-known prefix with ipv4", "64:ff9b::0c01:0203", "12.1.0.0"},
{"ipv6 rfc6145 translated ipv4", "::ffff:0:0c01:0203", "12.1.0.0"},
// Tor.
{"ipv6 tor onioncat", "fd87:d87e:eb43:1234::5678", "tor:2"},
{"ipv6 tor onioncat 2", "fd87:d87e:eb43:1245::6789", "tor:2"},
{"ipv6 tor onioncat 3", "fd87:d87e:eb43:1345::6789", "tor:3"},
// IPv6 normal.
{"ipv6 normal", "2602:100::1", "2602:100::"},
{"ipv6 normal 2", "2602:0100::1234", "2602:100::"},
{"ipv6 hurricane electric", "2001:470:1f10:a1::2", "2001:470:1000::"},
{"ipv6 hurricane electric 2", "2001:0470:1f10:a1::2", "2001:470:1000::"},
}
for i, tc := range testCases {
nip := net.ParseIP(tc.ip)
key := groupKeyFor(p2p.NewNetAddressIPPort(nip, 26656), false)
assert.Equal(t, tc.expKey, key, "#%d", i)
}
// strict routability
testCases = []struct {
name string
ip string
expKey string
}{
// Local addresses.
{"ipv4 localhost", "127.0.0.1", "local"},
{"ipv6 localhost", "::1", "local"},
{"ipv4 zero", "0.0.0.0", "local"},
{"ipv4 first octet zero", "0.1.2.3", "local"},
// Unroutable addresses.
{"ipv4 invalid bcast", "255.255.255.255", "unroutable"},
{"ipv4 rfc1918 10/8", "10.1.2.3", "unroutable"},
{"ipv4 rfc1918 172.16/12", "172.16.1.2", "unroutable"},
{"ipv4 rfc1918 192.168/16", "192.168.1.2", "unroutable"},
{"ipv6 rfc3849 2001:db8::/32", "2001:db8::1234", "unroutable"},
{"ipv4 rfc3927 169.254/16", "169.254.1.2", "unroutable"},
{"ipv6 rfc4193 fc00::/7", "fc00::1234", "unroutable"},
{"ipv6 rfc4843 2001:10::/28", "2001:10::1234", "unroutable"},
{"ipv6 rfc4862 fe80::/64", "fe80::1234", "unroutable"},
}
for i, tc := range testCases {
nip := net.ParseIP(tc.ip)
key := groupKeyFor(p2p.NewNetAddressIPPort(nip, 26656), true)
assert.Equal(t, tc.expKey, key, "#%d", i)
}
}
func assertMOldAndNNewAddrsInSelection(t *testing.T, m, n int, addrs []*p2p.NetAddress, book *addrBook) {
nOld, nNew := countOldAndNewAddrsInSelection(addrs, book)
assert.Equal(t, m, nOld, "old addresses")
assert.Equal(t, n, nNew, "new addresses")
}
func createTempFileName(t *testing.T, prefix string) string {
t.Helper()
f, err := ioutil.TempFile("", prefix)
if err != nil {
panic(err)
}
fname := f.Name()
if err := f.Close(); err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = os.Remove(fname) })
return fname
}
func createAddrBookWithMOldAndNNewAddrs(t *testing.T, nOld, nNew int) (book *addrBook, fname string) {
t.Helper()
fname = createTempFileName(t, "addrbook_test")
book = NewAddrBook(fname, true).(*addrBook)
book.SetLogger(log.TestingLogger())
assert.Zero(t, book.Size())
randAddrs := randNetAddressPairs(t, nOld)
for _, addr := range randAddrs {
err := book.AddAddress(addr.addr, addr.src)
require.NoError(t, err)
book.MarkGood(addr.addr.ID)
}
randAddrs = randNetAddressPairs(t, nNew)
for _, addr := range randAddrs {
err := book.AddAddress(addr.addr, addr.src)
require.NoError(t, err)
}
return
}
func countOldAndNewAddrsInSelection(addrs []*p2p.NetAddress, book *addrBook) (nOld, nNew int) {
for _, addr := range addrs {
if book.IsGood(addr) {
nOld++
} else {
nNew++
}
}
return
}
// Analyse the layout of the selection specified by 'addrs'
// Returns:
// - seqLens - the lengths of the sequences of addresses of same type
// - seqTypes - the types of sequences in selection
func analyseSelectionLayout(book *addrBook, addrs []*p2p.NetAddress) (seqLens, seqTypes []int, err error) {
// address types are: 0 - nil, 1 - new, 2 - old
var (
prevType = 0
currentSeqLen = 0
)
for _, addr := range addrs {
addrType := 0
if book.IsGood(addr) {
addrType = 2
} else {
addrType = 1
}
if addrType != prevType && prevType != 0 {
seqLens = append(seqLens, currentSeqLen)
seqTypes = append(seqTypes, prevType)
currentSeqLen = 0
}
currentSeqLen++
prevType = addrType
}
seqLens = append(seqLens, currentSeqLen)
seqTypes = append(seqTypes, prevType)
return
}