ceremonyclient/go-libp2p/p2p/net/swarm/limiter_test.go

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package swarm
import (
"context"
"errors"
"fmt"
"math/rand"
"strconv"
"sync"
"testing"
"time"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/test"
"github.com/libp2p/go-libp2p/core/transport"
ma "github.com/multiformats/go-multiaddr"
mafmt "github.com/multiformats/go-multiaddr-fmt"
)
func addrWithPort(p int) ma.Multiaddr {
return ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", p))
}
// in these tests I use addresses with tcp ports over a certain number to
// signify 'good' addresses that will succeed, and addresses below that number
// will fail. This lets us more easily test these different scenarios.
func tcpPortOver(a ma.Multiaddr, n int) bool {
port, err := a.ValueForProtocol(ma.P_TCP)
if err != nil {
panic(err)
}
pnum, err := strconv.Atoi(port)
if err != nil {
panic(err)
}
return pnum > n
}
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func tryDialAddrs(ctx context.Context, l *dialLimiter, p peer.ID, addrs []ma.Multiaddr, res chan transport.DialUpdate) {
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for _, a := range addrs {
l.AddDialJob(&dialJob{
ctx: ctx,
peer: p,
addr: a,
resp: res,
})
}
}
func hangDialFunc(hang chan struct{}) dialfunc {
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return func(ctx context.Context, p peer.ID, a ma.Multiaddr, _ chan<- transport.DialUpdate) (transport.CapableConn, error) {
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if mafmt.UTP.Matches(a) {
return transport.CapableConn(nil), nil
}
_, err := a.ValueForProtocol(ma.P_CIRCUIT)
if err == nil {
return transport.CapableConn(nil), nil
}
if tcpPortOver(a, 10) {
return transport.CapableConn(nil), nil
}
<-hang
return nil, fmt.Errorf("test bad dial")
}
}
func TestLimiterBasicDials(t *testing.T) {
hang := make(chan struct{})
defer close(hang)
l := newDialLimiterWithParams(hangDialFunc(hang), ConcurrentFdDials, 4)
bads := []ma.Multiaddr{addrWithPort(1), addrWithPort(2), addrWithPort(3), addrWithPort(4)}
good := addrWithPort(20)
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resch := make(chan transport.DialUpdate)
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pid := peer.ID("testpeer")
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
tryDialAddrs(ctx, l, pid, bads, resch)
l.AddDialJob(&dialJob{
ctx: ctx,
peer: pid,
addr: good,
resp: resch,
})
select {
case <-resch:
t.Fatal("no dials should have completed!")
case <-time.After(time.Millisecond * 100):
}
// complete a single hung dial
hang <- struct{}{}
select {
case r := <-resch:
if r.Err == nil {
t.Fatal("should have gotten failed dial result")
}
case <-time.After(time.Second):
t.Fatal("timed out waiting for dial completion")
}
select {
case r := <-resch:
if r.Err != nil {
t.Fatal("expected second result to be success!")
}
case <-time.After(time.Second):
}
}
func TestFDLimiting(t *testing.T) {
hang := make(chan struct{})
defer close(hang)
l := newDialLimiterWithParams(hangDialFunc(hang), 16, 5)
bads := []ma.Multiaddr{addrWithPort(1), addrWithPort(2), addrWithPort(3), addrWithPort(4)}
pids := []peer.ID{"testpeer1", "testpeer2", "testpeer3", "testpeer4"}
goodTCP := addrWithPort(20)
ctx := context.Background()
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resch := make(chan transport.DialUpdate)
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// take all fd limit tokens with hang dials
for _, pid := range pids {
tryDialAddrs(ctx, l, pid, bads, resch)
}
// these dials should work normally, but will hang because we have taken
// up all the fd limiting
for _, pid := range pids {
l.AddDialJob(&dialJob{
ctx: ctx,
peer: pid,
addr: goodTCP,
resp: resch,
})
}
select {
case <-resch:
t.Fatal("no dials should have completed!")
case <-time.After(time.Millisecond * 100):
}
pid5 := peer.ID("testpeer5")
utpaddr := ma.StringCast("/ip4/127.0.0.1/udp/7777/utp")
// This should complete immediately since utp addresses arent blocked by fd rate limiting
l.AddDialJob(&dialJob{ctx: ctx, peer: pid5, addr: utpaddr, resp: resch})
select {
case res := <-resch:
if res.Err != nil {
t.Fatal("should have gotten successful response")
}
case <-time.After(time.Second * 5):
t.Fatal("timeout waiting for utp addr success")
}
// A relay address with tcp transport will complete because we do not consume fds for dials
// with relay addresses as the fd will be consumed when we actually dial the relay server.
pid6 := test.RandPeerIDFatal(t)
relayAddr := ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/20/p2p-circuit/p2p/%s", pid6))
l.AddDialJob(&dialJob{ctx: ctx, peer: pid6, addr: relayAddr, resp: resch})
select {
case res := <-resch:
if res.Err != nil {
t.Fatal("should have gotten successful response")
}
case <-time.After(time.Second * 5):
t.Fatal("timeout waiting for relay addr success")
}
}
func TestTokenRedistribution(t *testing.T) {
var lk sync.Mutex
hangchs := make(map[peer.ID]chan struct{})
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df := func(ctx context.Context, p peer.ID, a ma.Multiaddr, _ chan<- transport.DialUpdate) (transport.CapableConn, error) {
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if tcpPortOver(a, 10) {
return (transport.CapableConn)(nil), nil
}
lk.Lock()
ch := hangchs[p]
lk.Unlock()
<-ch
return nil, fmt.Errorf("test bad dial")
}
l := newDialLimiterWithParams(df, 8, 4)
bads := []ma.Multiaddr{addrWithPort(1), addrWithPort(2), addrWithPort(3), addrWithPort(4)}
pids := []peer.ID{"testpeer1", "testpeer2"}
ctx := context.Background()
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resch := make(chan transport.DialUpdate)
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// take all fd limit tokens with hang dials
for _, pid := range pids {
hangchs[pid] = make(chan struct{})
}
for _, pid := range pids {
tryDialAddrs(ctx, l, pid, bads, resch)
}
// add a good dial job for peer 1
l.AddDialJob(&dialJob{
ctx: ctx,
peer: pids[1],
addr: ma.StringCast("/ip4/127.0.0.1/tcp/1001"),
resp: resch,
})
select {
case <-resch:
t.Fatal("no dials should have completed!")
case <-time.After(time.Millisecond * 100):
}
// unblock one dial for peer 0
hangchs[pids[0]] <- struct{}{}
select {
case res := <-resch:
if res.Err == nil {
t.Fatal("should have only been a failure here")
}
case <-time.After(time.Millisecond * 100):
t.Fatal("expected a dial failure here")
}
select {
case <-resch:
t.Fatal("no more dials should have completed!")
case <-time.After(time.Millisecond * 100):
}
// add a bad dial job to peer 0 to fill their rate limiter
// and test that more dials for this peer won't interfere with peer 1's successful dial incoming
l.AddDialJob(&dialJob{
ctx: ctx,
peer: pids[0],
addr: addrWithPort(7),
resp: resch,
})
hangchs[pids[1]] <- struct{}{}
// now one failed dial from peer 1 should get through and fail
// which will in turn unblock the successful dial on peer 1
select {
case res := <-resch:
if res.Err == nil {
t.Fatal("should have only been a failure here")
}
case <-time.After(time.Millisecond * 100):
t.Fatal("expected a dial failure here")
}
select {
case res := <-resch:
if res.Err != nil {
t.Fatal("should have succeeded!")
}
case <-time.After(time.Millisecond * 100):
t.Fatal("should have gotten successful dial")
}
}
func TestStressLimiter(t *testing.T) {
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df := func(ctx context.Context, p peer.ID, a ma.Multiaddr, _ chan<- transport.DialUpdate) (transport.CapableConn, error) {
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if tcpPortOver(a, 1000) {
return transport.CapableConn(nil), nil
}
time.Sleep(time.Millisecond * time.Duration(5+rand.Intn(100)))
return nil, fmt.Errorf("test bad dial")
}
l := newDialLimiterWithParams(df, 20, 5)
var bads []ma.Multiaddr
for i := 0; i < 100; i++ {
bads = append(bads, addrWithPort(i))
}
addresses := append(bads, addrWithPort(2000))
success := make(chan struct{})
for i := 0; i < 20; i++ {
go func(id peer.ID) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
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resp := make(chan transport.DialUpdate)
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time.Sleep(time.Duration(rand.Intn(10)) * time.Millisecond)
for _, i := range rand.Perm(len(addresses)) {
l.AddDialJob(&dialJob{
addr: addresses[i],
ctx: ctx,
peer: id,
resp: resp,
})
}
for res := range resp {
if res.Err == nil {
success <- struct{}{}
return
}
}
}(peer.ID(fmt.Sprintf("testpeer%d", i)))
}
for i := 0; i < 20; i++ {
select {
case <-success:
case <-time.After(time.Minute):
t.Fatal("expected a success within five seconds")
}
}
}
func TestFDLimitUnderflow(t *testing.T) {
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df := func(ctx context.Context, p peer.ID, addr ma.Multiaddr, _ chan<- transport.DialUpdate) (transport.CapableConn, error) {
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select {
case <-ctx.Done():
case <-time.After(5 * time.Second):
}
return nil, fmt.Errorf("df timed out")
}
const fdLimit = 20
l := newDialLimiterWithParams(df, fdLimit, 3)
var addrs []ma.Multiaddr
for i := 0; i <= 1000; i++ {
addrs = append(addrs, addrWithPort(i))
}
wg := sync.WaitGroup{}
const num = 3 * fdLimit
wg.Add(num)
errs := make(chan error, num)
for i := 0; i < num; i++ {
go func(id peer.ID, i int) {
defer wg.Done()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
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resp := make(chan transport.DialUpdate)
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l.AddDialJob(&dialJob{
addr: addrs[i],
ctx: ctx,
peer: id,
resp: resp,
})
for res := range resp {
if res.Err != nil {
return
}
errs <- errors.New("got dial res, but shouldn't")
}
}(peer.ID(fmt.Sprintf("testpeer%d", i%20)), i)
}
go func() {
wg.Wait()
close(errs)
}()
for err := range errs {
t.Fatal(err)
}
l.lk.Lock()
fdConsuming := l.fdConsuming
l.lk.Unlock()
if fdConsuming < 0 {
t.Fatalf("l.fdConsuming < 0")
}
}