snapshot of https://github.com/nats-io/nats-server.git (main, 2026-09-15; blobs > 131072B omitted)

test/test_test.go

@@ -0,0 +1,164 @@
+// 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)
+	}
+}