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mux.go
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mux.go
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package mux
import (
"bytes"
"context"
crand "crypto/rand"
"fmt"
"io"
mrand "math/rand"
"net"
"reflect"
"runtime"
"runtime/debug"
"strings"
"sync"
"testing"
"time"
"github.com/libp2p/go-libp2p-testing/ci"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/stretchr/testify/require"
)
var randomness []byte
var Subtests map[string]TransportTest
func init() {
// read 1MB of randomness
randomness = make([]byte, 1<<20)
if _, err := crand.Read(randomness); err != nil {
panic(err)
}
Subtests = make(map[string]TransportTest)
for _, f := range subtests {
Subtests[getFunctionName(f)] = f
}
}
func getFunctionName(i interface{}) string {
return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
}
type peerScope struct {
mx sync.Mutex
memory int
}
func (p *peerScope) ReserveMemory(size int, _ uint8) error {
p.mx.Lock()
p.memory += size
p.mx.Unlock()
return nil
}
func (p *peerScope) ReleaseMemory(size int) {
p.mx.Lock()
defer p.mx.Unlock()
if p.memory < size {
panic(fmt.Sprintf("tried to release too much memory: %d (current: %d)", size, p.memory))
}
p.memory -= size
}
// Check checks that we don't have any more reserved memory.
func (p *peerScope) Check(t *testing.T) {
p.mx.Lock()
defer p.mx.Unlock()
require.Zero(t, p.memory, "expected all reserved memory to have been released")
}
type peerScopeSpan struct {
peerScope
}
func (p *peerScopeSpan) Done() {
p.mx.Lock()
defer p.mx.Unlock()
p.memory = 0
}
func (p *peerScope) Stat() network.ScopeStat { return network.ScopeStat{} }
func (p *peerScope) BeginSpan() (network.ResourceScopeSpan, error) { return &peerScopeSpan{}, nil }
func (p *peerScope) Peer() peer.ID { panic("implement me") }
var _ network.PeerScope = &peerScope{}
type Options struct {
tr network.Multiplexer
connNum int
streamNum int
msgNum int
msgMin int
msgMax int
}
func randBuf(size int) []byte {
n := len(randomness) - size
if size < 1 {
panic(fmt.Errorf("requested too large buffer (%d). max is %d", size, len(randomness)))
}
start := mrand.Intn(n)
return randomness[start : start+size]
}
func checkErr(t *testing.T, err error) {
if err != nil {
debug.PrintStack()
t.Fatal(err)
}
}
func echoStream(s network.MuxedStream) {
defer s.Close()
io.Copy(s, s) // echo everything
}
func GoServe(t *testing.T, tr network.Multiplexer, l net.Listener) (done func()) {
closed := make(chan struct{}, 1)
go func() {
for {
c1, err := l.Accept()
if err != nil {
select {
case <-closed:
return // closed naturally.
default:
checkErr(t, err)
}
}
sc1, err := tr.NewConn(c1, true, nil)
checkErr(t, err)
go func() {
for {
str, err := sc1.AcceptStream()
if err != nil {
break
}
go echoStream(str)
}
}()
}
}()
return func() {
closed <- struct{}{}
}
}
func SubtestSimpleWrite(t *testing.T, tr network.Multiplexer) {
l, err := net.Listen("tcp", "localhost:0")
checkErr(t, err)
done := GoServe(t, tr, l)
defer done()
nc1, err := net.Dial("tcp", l.Addr().String())
checkErr(t, err)
defer nc1.Close()
scope := &peerScope{}
c1, err := tr.NewConn(nc1, false, scope)
checkErr(t, err)
defer func() {
c1.Close()
scope.Check(t)
}()
// serve the outgoing conn, because some muxers assume
// that we _always_ call serve. (this is an error?)
go c1.AcceptStream()
s1, err := c1.OpenStream(context.Background())
checkErr(t, err)
defer s1.Close()
buf1 := randBuf(4096)
_, err = s1.Write(buf1)
checkErr(t, err)
buf2 := make([]byte, len(buf1))
_, err = io.ReadFull(s1, buf2)
checkErr(t, err)
require.Equal(t, buf1, buf2)
}
func SubtestStress(t *testing.T, opt Options) {
msgsize := 1 << 11
errs := make(chan error) // dont block anything.
rateLimitN := 5000 // max of 5k funcs, because -race has 8k max.
rateLimitChan := make(chan struct{}, rateLimitN)
for i := 0; i < rateLimitN; i++ {
rateLimitChan <- struct{}{}
}
rateLimit := func(f func()) {
<-rateLimitChan
f()
rateLimitChan <- struct{}{}
}
writeStream := func(s network.MuxedStream, bufs chan<- []byte) {
for i := 0; i < opt.msgNum; i++ {
buf := randBuf(msgsize)
bufs <- buf
if _, err := s.Write(buf); err != nil {
errs <- fmt.Errorf("s.Write(buf): %s", err)
continue
}
}
}
readStream := func(s network.MuxedStream, bufs <-chan []byte) {
buf2 := make([]byte, msgsize)
for buf1 := range bufs {
if _, err := io.ReadFull(s, buf2); err != nil {
errs <- fmt.Errorf("io.ReadFull(s, buf2): %s", err)
continue
}
if !bytes.Equal(buf1, buf2) {
errs <- fmt.Errorf("buffers not equal (%x != %x)", buf1[:3], buf2[:3])
}
}
}
openStreamAndRW := func(c network.MuxedConn) {
s, err := c.OpenStream(context.Background())
if err != nil {
errs <- fmt.Errorf("failed to create NewStream: %s", err)
return
}
bufs := make(chan []byte, opt.msgNum)
go func() {
writeStream(s, bufs)
close(bufs)
}()
readStream(s, bufs)
s.Close()
}
openConnAndRW := func() {
l, err := net.Listen("tcp", "localhost:0")
checkErr(t, err)
done := GoServe(t, opt.tr, l)
defer done()
nla := l.Addr()
nc, err := net.Dial(nla.Network(), nla.String())
checkErr(t, err)
if err != nil {
t.Fatal(fmt.Errorf("net.Dial(%s, %s): %s", nla.Network(), nla.String(), err))
return
}
scope := &peerScope{}
c, err := opt.tr.NewConn(nc, false, scope)
if err != nil {
t.Fatal(fmt.Errorf("a.AddConn(%s <--> %s): %s", nc.LocalAddr(), nc.RemoteAddr(), err))
return
}
// serve the outgoing conn, because some muxers assume
// that we _always_ call serve. (this is an error?)
go func() {
for {
str, err := c.AcceptStream()
if err != nil {
break
}
go echoStream(str)
}
}()
var wg sync.WaitGroup
for i := 0; i < opt.streamNum; i++ {
wg.Add(1)
go rateLimit(func() {
defer wg.Done()
openStreamAndRW(c)
})
}
wg.Wait()
c.Close()
scope.Check(t)
}
openConnsAndRW := func() {
var wg sync.WaitGroup
for i := 0; i < opt.connNum; i++ {
wg.Add(1)
go rateLimit(func() {
defer wg.Done()
openConnAndRW()
})
}
wg.Wait()
}
go func() {
openConnsAndRW()
close(errs) // done
}()
for err := range errs {
t.Error(err)
}
}
func tcpPipe(t *testing.T) (net.Conn, net.Conn) {
list, err := net.Listen("tcp", "0.0.0.0:0")
if err != nil {
t.Fatal(err)
}
con1, err := net.Dial("tcp", list.Addr().String())
if err != nil {
t.Fatal(err)
}
con2, err := list.Accept()
if err != nil {
t.Fatal(err)
}
return con1, con2
}
func SubtestStreamOpenStress(t *testing.T, tr network.Multiplexer) {
wg := new(sync.WaitGroup)
a, b := tcpPipe(t)
defer a.Close()
defer b.Close()
defer wg.Wait()
wg.Add(1)
count := 10000
workers := 5
go func() {
defer wg.Done()
muxa, err := tr.NewConn(a, true, nil)
if err != nil {
t.Error(err)
return
}
stress := func() {
defer wg.Done()
for i := 0; i < count; i++ {
s, err := muxa.OpenStream(context.Background())
if err != nil {
t.Error(err)
return
}
err = s.CloseWrite()
if err != nil {
t.Error(err)
}
n, err := s.Read([]byte{0})
if n != 0 {
t.Error("expected to read no bytes")
}
if err != io.EOF {
t.Errorf("expected an EOF, got %s", err)
}
}
}
for i := 0; i < workers; i++ {
wg.Add(1)
go stress()
}
}()
scope := &peerScope{}
muxb, err := tr.NewConn(b, false, scope)
if err != nil {
t.Fatal(err)
}
defer func() {
muxb.Close()
scope.Check(t)
}()
time.Sleep(time.Millisecond * 50)
wg.Add(1)
recv := make(chan struct{}, count*workers)
go func() {
defer wg.Done()
for i := 0; i < count*workers; i++ {
str, err := muxb.AcceptStream()
if err != nil {
break
}
wg.Add(1)
go func() {
defer wg.Done()
str.Close()
select {
case recv <- struct{}{}:
default:
t.Error("too many stream")
}
}()
}
}()
timeout := time.Second * 10
if ci.IsRunning() {
timeout *= 10
}
limit := time.After(timeout)
for i := 0; i < count*workers; i++ {
select {
case <-recv:
case <-limit:
t.Fatal("timed out receiving streams")
}
}
wg.Wait()
}
func SubtestStreamReset(t *testing.T, tr network.Multiplexer) {
wg := new(sync.WaitGroup)
defer wg.Wait()
a, b := tcpPipe(t)
defer a.Close()
defer b.Close()
wg.Add(1)
scopea := &peerScope{}
muxa, err := tr.NewConn(a, true, scopea)
if err != nil {
t.Error(err)
return
}
defer func() {
muxa.Close()
scopea.Check(t)
}()
go func() {
defer wg.Done()
s, err := muxa.OpenStream(context.Background())
if err != nil {
t.Error(err)
return
}
time.Sleep(time.Millisecond * 50)
_, err = s.Write([]byte("foo"))
if err != network.ErrReset {
t.Error("should have been stream reset")
}
s.Close()
}()
scopeb := &peerScope{}
muxb, err := tr.NewConn(b, false, scopeb)
if err != nil {
t.Fatal(err)
}
defer func() {
muxb.Close()
scopeb.Check(t)
}()
str, err := muxb.AcceptStream()
checkErr(t, err)
str.Reset()
wg.Wait()
}
// check that Close also closes the underlying net.Conn
func SubtestWriteAfterClose(t *testing.T, tr network.Multiplexer) {
a, b := tcpPipe(t)
scopea := &peerScope{}
muxa, err := tr.NewConn(a, true, scopea)
checkErr(t, err)
scopeb := &peerScope{}
muxb, err := tr.NewConn(b, false, scopeb)
checkErr(t, err)
checkErr(t, muxa.Close())
scopea.Check(t)
checkErr(t, muxb.Close())
scopeb.Check(t)
// make sure the underlying net.Conn was closed
if _, err := a.Write([]byte("foobar")); err == nil || !strings.Contains(err.Error(), "use of closed network connection") {
t.Fatal("write should have failed")
}
if _, err := b.Write([]byte("foobar")); err == nil || !strings.Contains(err.Error(), "use of closed network connection") {
t.Fatal("write should have failed")
}
}
func SubtestStreamLeftOpen(t *testing.T, tr network.Multiplexer) {
a, b := tcpPipe(t)
const numStreams = 10
const dataLen = 50 * 1024
scopea := &peerScope{}
muxa, err := tr.NewConn(a, true, scopea)
checkErr(t, err)
scopeb := &peerScope{}
muxb, err := tr.NewConn(b, false, scopeb)
checkErr(t, err)
var wg sync.WaitGroup
wg.Add(1 + numStreams)
go func() {
defer wg.Done()
for i := 0; i < numStreams; i++ {
stra, err := muxa.OpenStream(context.Background())
checkErr(t, err)
go func() {
defer wg.Done()
_, err = stra.Write(randBuf(dataLen))
checkErr(t, err)
// do NOT close or reset the stream
}()
}
}()
wg.Add(1 + numStreams)
go func() {
defer wg.Done()
for i := 0; i < numStreams; i++ {
str, err := muxb.AcceptStream()
checkErr(t, err)
go func() {
defer wg.Done()
_, err = io.ReadFull(str, make([]byte, dataLen))
checkErr(t, err)
}()
}
}()
// Now we have a bunch of open streams.
// Make sure that their memory is returned when we close the connection.
wg.Wait()
muxa.Close()
scopea.Check(t)
muxb.Close()
scopeb.Check(t)
}
func SubtestStress1Conn1Stream1Msg(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 1,
streamNum: 1,
msgNum: 1,
msgMax: 100,
msgMin: 100,
})
}
func SubtestStress1Conn1Stream100Msg(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 1,
streamNum: 1,
msgNum: 100,
msgMax: 100,
msgMin: 100,
})
}
func SubtestStress1Conn100Stream100Msg(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 1,
streamNum: 100,
msgNum: 100,
msgMax: 100,
msgMin: 100,
})
}
func SubtestStress10Conn10Stream50Msg(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 10,
streamNum: 10,
msgNum: 50,
msgMax: 100,
msgMin: 100,
})
}
func SubtestStress1Conn1000Stream10Msg(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 1,
streamNum: 1000,
msgNum: 10,
msgMax: 100,
msgMin: 100,
})
}
func SubtestStress1Conn100Stream100Msg10MB(t *testing.T, tr network.Multiplexer) {
SubtestStress(t, Options{
tr: tr,
connNum: 1,
streamNum: 100,
msgNum: 100,
msgMax: 10000,
msgMin: 1000,
})
}
// Subtests are all the subtests run by SubtestAll
var subtests = []TransportTest{
SubtestSimpleWrite,
SubtestWriteAfterClose,
SubtestStress1Conn1Stream1Msg,
SubtestStress1Conn1Stream100Msg,
SubtestStress1Conn100Stream100Msg,
SubtestStress10Conn10Stream50Msg,
SubtestStress1Conn1000Stream10Msg,
SubtestStress1Conn100Stream100Msg10MB,
SubtestStreamOpenStress,
SubtestStreamReset,
SubtestStreamLeftOpen,
}
// SubtestAll runs all the stream multiplexer tests against the target
// transport.
func SubtestAll(t *testing.T, tr network.Multiplexer) {
for name, f := range Subtests {
t.Run(name, func(t *testing.T) {
f(t, tr)
})
}
}
// TransportTest is a stream multiplex transport test case
type TransportTest func(t *testing.T, tr network.Multiplexer)