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// Copyright 2016-2025 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"context"
"fmt"
"net"
"strconv"
"strings"
"sync"
"testing"
"time"
"github.com/nats-io/nats-server/v2/server"
"golang.org/x/time/rate"
)
func checkFor(t testing.TB, totalWait, sleepDur time.Duration, f func() error) {
t.Helper()
timeout := time.Now().Add(totalWait)
var err error
for time.Now().Before(timeout) {
err = f()
if err == nil {
return
}
time.Sleep(sleepDur)
}
if err != nil {
t.Fatal(err.Error())
}
}
// Slow Proxy - For introducing RTT and BW constraints.
type slowProxy struct {
listener net.Listener
conns []net.Conn
o *server.Options
u string
}
func newSlowProxy(rtt time.Duration, up, down int, opts *server.Options) *slowProxy {
saddr := net.JoinHostPort(opts.Host, strconv.Itoa(opts.Port))
hp := net.JoinHostPort("127.0.0.1", "0")
l, e := net.Listen("tcp", hp)
if e != nil {
panic(fmt.Sprintf("Error listening on port: %s, %q", hp, e))
}
port := l.Addr().(*net.TCPAddr).Port
sp := &slowProxy{listener: l}
go func() {
client, err := l.Accept()
if err != nil {
return
}
server, err := net.DialTimeout("tcp", saddr, time.Second)
if err != nil {
panic("Can't connect to server")
}
sp.conns = append(sp.conns, client, server)
go sp.loop(rtt, up, client, server)
go sp.loop(rtt, down, server, client)
}()
sp.o = &server.Options{Host: "127.0.0.1", Port: port}
sp.u = fmt.Sprintf("nats://%s:%d", sp.o.Host, sp.o.Port)
return sp
}
func (sp *slowProxy) opts() *server.Options {
return sp.o
}
//lint:ignore U1000 Referenced in norace_test.go
func (sp *slowProxy) clientURL() string {
return sp.u
}
func (sp *slowProxy) loop(rtt time.Duration, tbw int, r, w net.Conn) {
delay := rtt / 2
const rbl = 1024
var buf [rbl]byte
ctx := context.Background()
rl := rate.NewLimiter(rate.Limit(tbw), rbl)
for fr := true; ; {
sr := time.Now()
n, err := r.Read(buf[:])
if err != nil {
return
}
// RTT delays
if fr || time.Since(sr) > 2*time.Millisecond {
fr = false
time.Sleep(delay)
}
if err := rl.WaitN(ctx, n); err != nil {
return
}
if _, err = w.Write(buf[:n]); err != nil {
return
}
}
}
func (sp *slowProxy) stop() {
if sp.listener != nil {
sp.listener.Close()
sp.listener = nil
for _, c := range sp.conns {
c.Close()
}
}
}
// Dummy Logger
type dummyLogger struct {
sync.Mutex
msg string
}
func (d *dummyLogger) Fatalf(format string, args ...any) {
d.Lock()
d.msg = fmt.Sprintf(format, args...)
d.Unlock()
}
func (d *dummyLogger) Errorf(format string, args ...any) {
}
func (d *dummyLogger) Debugf(format string, args ...any) {
}
func (d *dummyLogger) Tracef(format string, args ...any) {
}
func (d *dummyLogger) Noticef(format string, args ...any) {
}
func (d *dummyLogger) Warnf(format string, args ...any) {
}
func TestStackFatal(t *testing.T) {
d := &dummyLogger{}
stackFatalf(d, "test stack %d", 1)
if !strings.HasPrefix(d.msg, "test stack 1") {
t.Fatalf("Unexpected start of stack: %v", d.msg)
}
if !strings.Contains(d.msg, "test_test.go") {
t.Fatalf("Unexpected stack: %v", d.msg)
}
}
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