mirror of
https://github.com/gogrlx/nats-server.git
synced 2026-04-02 11:48:43 -07:00
f0f807f99a
Ivan had the idea of using the CONNECT to establish a first estimate of RTT without additional PING/PONGs. Signed-off-by: Derek Collison <derek@nats.io>
138 lines
3.1 KiB
Go
138 lines
3.1 KiB
Go
// Copyright 2016-2018 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package test
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import (
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"fmt"
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"net"
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"strconv"
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"strings"
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"sync"
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"testing"
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"time"
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"github.com/nats-io/nats-server/v2/server"
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)
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func checkFor(t *testing.T, totalWait, sleepDur time.Duration, f func() error) {
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t.Helper()
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timeout := time.Now().Add(totalWait)
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var err error
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for time.Now().Before(timeout) {
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err = f()
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if err == nil {
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return
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}
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time.Sleep(sleepDur)
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}
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if err != nil {
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t.Fatal(err.Error())
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}
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}
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// Slow Proxy - really crude but works for introducing simple RTT delays.
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type slowProxy struct {
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listener net.Listener
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conns []net.Conn
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}
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func newSlowProxy(latency time.Duration, opts *server.Options) (*slowProxy, *server.Options) {
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saddr := net.JoinHostPort(opts.Host, strconv.Itoa(opts.Port))
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hp := net.JoinHostPort("127.0.0.1", "0")
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l, e := net.Listen("tcp", hp)
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if e != nil {
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panic(fmt.Sprintf("Error listening on port: %s, %q", hp, e))
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}
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port := l.Addr().(*net.TCPAddr).Port
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sp := &slowProxy{listener: l}
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go func() {
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client, err := l.Accept()
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if err != nil {
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return
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}
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server, err := net.DialTimeout("tcp", saddr, time.Second)
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if err != nil {
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panic("Can't connect to server")
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}
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sp.conns = append(sp.conns, client, server)
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go sp.loop(latency, client, server)
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go sp.loop(latency, server, client)
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}()
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sopts := &server.Options{Host: "127.0.0.1", Port: port}
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return sp, sopts
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}
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func (sp *slowProxy) loop(latency time.Duration, r, w net.Conn) {
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delay := latency / 2
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for {
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var buf [1024]byte
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n, err := r.Read(buf[:])
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if err != nil {
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return
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}
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time.Sleep(delay)
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if _, err = w.Write(buf[:n]); err != nil {
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return
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}
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}
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}
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func (sp *slowProxy) Stop() {
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if sp.listener != nil {
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sp.listener.Close()
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sp.listener = nil
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for _, c := range sp.conns {
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c.Close()
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}
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}
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}
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// Dummy Logger
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type dummyLogger struct {
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sync.Mutex
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msg string
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}
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func (d *dummyLogger) Fatalf(format string, args ...interface{}) {
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d.Lock()
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d.msg = fmt.Sprintf(format, args...)
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d.Unlock()
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}
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func (d *dummyLogger) Errorf(format string, args ...interface{}) {
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}
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func (d *dummyLogger) Debugf(format string, args ...interface{}) {
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}
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func (d *dummyLogger) Tracef(format string, args ...interface{}) {
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}
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func (d *dummyLogger) Noticef(format string, args ...interface{}) {
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}
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func (d *dummyLogger) Warnf(format string, args ...interface{}) {
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}
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func TestStackFatal(t *testing.T) {
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d := &dummyLogger{}
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stackFatalf(d, "test stack %d", 1)
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if !strings.HasPrefix(d.msg, "test stack 1") {
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t.Fatalf("Unexpected start of stack: %v", d.msg)
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}
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if !strings.Contains(d.msg, "test_test.go") {
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t.Fatalf("Unexpected stack: %v", d.msg)
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}
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}
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