nats_test.go

// Copyright 2012-2022 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 nats

////////////////////////////////////////////////////////////////////////////////
// Package scoped specific tests here..
////////////////////////////////////////////////////////////////////////////////

import (
	"bufio"
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"net"
	"net/http"
	"net/url"
	"os"
	"reflect"
	"regexp"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/nats-io/nats-server/v2/server"
	natsserver "github.com/nats-io/nats-server/v2/test"
	"github.com/nats-io/nkeys"
)

func TestVersion(t *testing.T) {
	// Semantic versioning
	verRe := regexp.MustCompile(`\d+.\d+.\d+(-\S+)?`)
	if !verRe.MatchString(Version) {
		t.Fatalf("Version not compatible with semantic versioning: %q", Version)
	}
}

// Dumb wait program to sync on callbacks, etc... Will timeout
func Wait(ch chan bool) error {
	return WaitTime(ch, 5*time.Second)
}

func WaitTime(ch chan bool, timeout time.Duration) error {
	select {
	case <-ch:
		return nil
	case <-time.After(timeout):
	}
	return errors.New("timeout")
}

func stackFatalf(t *testing.T, f string, args ...any) {
	lines := make([]string, 0, 32)
	msg := fmt.Sprintf(f, args...)
	lines = append(lines, msg)

	// Generate the Stack of callers: Skip us and verify* frames.
	for i := 1; true; i++ {
		_, file, line, ok := runtime.Caller(i)
		if !ok {
			break
		}
		msg := fmt.Sprintf("%d - %s:%d", i, file, line)
		lines = append(lines, msg)
	}
	t.Fatalf("%s", strings.Join(lines, "\n"))
}

// Check the error channel for an error and if one is present,
// calls t.Fatal(e.Error()). Note that this supports tests that
// send nil to the error channel and so report error only if
// e is != nil.
func checkErrChannel(t *testing.T, errCh chan error) {
	t.Helper()
	select {
	case e := <-errCh:
		if e != nil {
			t.Fatal(e.Error())
		}
	default:
	}
}

func TestVersionMatchesTag(t *testing.T) {
	tag := os.Getenv("TRAVIS_TAG")
	if tag == "" {
		t.SkipNow()
	}
	// We expect a tag of the form vX.Y.Z. If that's not the case,
	// we need someone to have a look. So fail if first letter is not
	// a `v`
	if tag[0] != 'v' {
		t.Fatalf("Expect tag to start with `v`, tag is: %s", tag)
	}
	// Strip the `v` from the tag for the version comparison.
	if Version != tag[1:] {
		t.Fatalf("Version (%s) does not match tag (%s)", Version, tag[1:])
	}
}

func TestExpandPath(t *testing.T) {
	if runtime.GOOS == "windows" {
		origUserProfile := os.Getenv("USERPROFILE")
		origHomeDrive, origHomePath := os.Getenv("HOMEDRIVE"), os.Getenv("HOMEPATH")
		defer func() {
			os.Setenv("USERPROFILE", origUserProfile)
			os.Setenv("HOMEDRIVE", origHomeDrive)
			os.Setenv("HOMEPATH", origHomePath)
		}()

		cases := []struct {
			path        string
			userProfile string
			homeDrive   string
			homePath    string

			wantPath string
			wantErr  bool
		}{
			// Missing HOMEDRIVE and HOMEPATH.
			{path: "/Foo/Bar", userProfile: `C:\Foo\Bar`, wantPath: "/Foo/Bar"},
			{path: "Foo/Bar", userProfile: `C:\Foo\Bar`, wantPath: "Foo/Bar"},
			{path: "~/Fizz", userProfile: `C:\Foo\Bar`, wantPath: `C:\Foo\Bar\Fizz`},

			// Missing USERPROFILE.
			{path: "~/Fizz", homeDrive: "X:", homePath: `\Foo\Bar`, wantPath: `X:\Foo\Bar\Fizz`},

			// Set all environment variables. HOMEDRIVE and HOMEPATH take
			// precedence.
			{path: "~/Fizz", userProfile: `C:\Foo\Bar`,
				homeDrive: "X:", homePath: `\Foo\Bar`, wantPath: `X:\Foo\Bar\Fizz`},

			// Missing all environment variables.
			{path: "~/Fizz", wantErr: true},
		}
		for i, c := range cases {
			t.Run(fmt.Sprintf("windows case %d", i), func(t *testing.T) {
				os.Setenv("USERPROFILE", c.userProfile)
				os.Setenv("HOMEDRIVE", c.homeDrive)
				os.Setenv("HOMEPATH", c.homePath)

				gotPath, err := expandPath(c.path)
				if !c.wantErr && err != nil {
					t.Fatalf("unexpected error: got=%v; want=%v", err, nil)
				} else if c.wantErr && err == nil {
					t.Fatalf("unexpected success: got=%v; want=%v", nil, "err")
				}

				if gotPath != c.wantPath {
					t.Fatalf("unexpected path: got=%v; want=%v", gotPath, c.wantPath)
				}
			})
		}

		return
	}

	// Unix tests

	origHome := os.Getenv("HOME")
	defer os.Setenv("HOME", origHome)

	cases := []struct {
		path    string
		home    string
		testEnv string

		wantPath string
		wantErr  bool
	}{
		{path: "/foo/bar", home: "/fizz/buzz", wantPath: "/foo/bar"},
		{path: "foo/bar", home: "/fizz/buzz", wantPath: "foo/bar"},
		{path: "~/fizz", home: "/foo/bar", wantPath: "/foo/bar/fizz"},
		{path: "$HOME/fizz", home: "/foo/bar", wantPath: "/foo/bar/fizz"},

		// missing HOME env var
		{path: "~/fizz", wantErr: true},
	}
	for i, c := range cases {
		t.Run(fmt.Sprintf("unix case %d", i), func(t *testing.T) {
			os.Setenv("HOME", c.home)

			gotPath, err := expandPath(c.path)
			if !c.wantErr && err != nil {
				t.Fatalf("unexpected error: got=%v; want=%v", err, nil)
			} else if c.wantErr && err == nil {
				t.Fatalf("unexpected success: got=%v; want=%v", nil, "err")
			}

			if gotPath != c.wantPath {
				t.Fatalf("unexpected path: got=%v; want=%v", gotPath, c.wantPath)
			}
		})
	}
}

////////////////////////////////////////////////////////////////////////////////
// Reconnect tests
////////////////////////////////////////////////////////////////////////////////

const TEST_PORT = 8368

var reconnectOpts = Options{
	Url:            fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT),
	AllowReconnect: true,
	MaxReconnect:   10,
	ReconnectWait:  100 * time.Millisecond,
	Timeout:        DefaultTimeout,
}

func RunServerOnPort(port int) *server.Server {
	opts := natsserver.DefaultTestOptions
	opts.Port = port
	return RunServerWithOptions(&opts)
}

func RunServerWithOptions(opts *server.Options) *server.Server {
	return natsserver.RunServer(opts)
}

func TestReconnectServerStats(t *testing.T) {
	ts := RunServerOnPort(TEST_PORT)

	opts := reconnectOpts
	nc, _ := opts.Connect()
	defer nc.Close()
	nc.Flush()

	ts.Shutdown()
	// server is stopped here...

	ts = RunServerOnPort(TEST_PORT)
	defer ts.Shutdown()

	if err := nc.FlushTimeout(5 * time.Second); err != nil {
		t.Fatalf("Error on Flush: %v", err)
	}

	// Make sure the server who is reconnected has the reconnects stats reset.
	nc.mu.Lock()
	_, cur := nc.currentServer()
	nc.mu.Unlock()

	if cur.reconnects != 0 {
		t.Fatalf("Current Server's reconnects should be 0 vs %d\n", cur.reconnects)
	}
}

////////////////////////////////////////////////////////////////////////////////
// ServerPool tests
////////////////////////////////////////////////////////////////////////////////

var testServers = []string{
	"nats://localhost:1222",
	"nats://localhost:1223",
	"nats://localhost:1224",
	"nats://localhost:1225",
	"nats://localhost:1226",
	"nats://localhost:1227",
	"nats://localhost:1228",
}

func TestMaxConnectionsReconnect(t *testing.T) {

	// Start first server
	s1Opts := natsserver.DefaultTestOptions
	s1Opts.Port = -1
	s1Opts.MaxConn = 2
	s1Opts.Cluster = server.ClusterOpts{Name: "test", Host: "127.0.0.1", Port: -1}
	s1 := RunServerWithOptions(&s1Opts)
	defer s1.Shutdown()

	// Start second server
	s2Opts := natsserver.DefaultTestOptions
	s2Opts.Port = -1
	s2Opts.MaxConn = 2
	s2Opts.Cluster = server.ClusterOpts{Name: "test", Host: "127.0.0.1", Port: -1}
	s2Opts.Routes = server.RoutesFromStr(fmt.Sprintf("nats://127.0.0.1:%d", s1Opts.Cluster.Port))
	s2 := RunServerWithOptions(&s2Opts)
	defer s2.Shutdown()

	errCh := make(chan error, 2)
	reconnectCh := make(chan struct{})
	opts := []Option{
		MaxReconnects(2),
		ReconnectWait(10 * time.Millisecond),
		Timeout(200 * time.Millisecond),
		DisconnectErrHandler(func(_ *Conn, err error) {
			if err != nil {
				errCh <- err
			}
		}),
		ReconnectHandler(func(_ *Conn) {
			reconnectCh <- struct{}{}
		}),
	}

	// Create two connections (the current max) to first server
	nc1, _ := Connect(s1.ClientURL(), opts...)
	defer nc1.Close()
	nc1.Flush()

	nc2, _ := Connect(s1.ClientURL(), opts...)
	defer nc2.Close()
	nc2.Flush()

	if s1.NumClients() != 2 {
		t.Fatalf("Expected 2 client connections to first server. Got %d", s1.NumClients())
	}

	if s2.NumClients() > 0 {
		t.Fatalf("Expected 0 client connections to second server. Got %d", s2.NumClients())
	}

	// Kick one of our two server connections off first server. One client should reconnect to second server
	newS1Opts := s1Opts
	newS1Opts.MaxConn = 1
	err := s1.ReloadOptions(&newS1Opts)
	if err != nil {
		t.Fatalf("Unexpected error changing max_connections [%s]", err)
	}

	select {
	case err := <-errCh:
		if err != ErrMaxConnectionsExceeded {
			t.Fatalf("Unexpected error %v", err)
		}
	case <-time.After(2 * time.Second):
		t.Fatal("Timed out waiting for disconnect event")
	}

	select {
	case <-reconnectCh:
	case <-time.After(2 * time.Second):
		t.Fatal("Timed out waiting for reconnect event")
	}

	if s2.NumClients() <= 0 || s1.NumClients() > 1 {
		t.Fatalf("Expected client reconnection to second server")
	}
}

func TestSimplifiedURLs(t *testing.T) {
	for _, test := range []struct {
		name     string
		servers  []string
		expected []string
	}{
		{
			"nats",
			[]string{
				"nats://host1:1234",
				"nats://host2:",
				"nats://host3",
				"host4:1234",
				"host5:",
				"host6",
				"nats://[1:2:3:4]:1234",
				"nats://[5:6:7:8]:",
				"nats://[9:10:11:12]",
				"[13:14:15:16]:",
				"[17:18:19:20]:1234",
			},
			[]string{
				"nats://host1:1234",
				"nats://host2:4222",
				"nats://host3:4222",
				"nats://host4:1234",
				"nats://host5:4222",
				"nats://host6:4222",
				"nats://[1:2:3:4]:1234",
				"nats://[5:6:7:8]:4222",
				"nats://[9:10:11:12]:4222",
				"nats://[13:14:15:16]:4222",
				"nats://[17:18:19:20]:1234",
			},
		},
		{
			"ws",
			[]string{
				"ws://host1:1234",
				"ws://host2:",
				"ws://host3",
				"ws://[1:2:3:4]:1234",
				"ws://[5:6:7:8]:",
				"ws://[9:10:11:12]",
			},
			[]string{
				"ws://host1:1234",
				"ws://host2:80",
				"ws://host3:80",
				"ws://[1:2:3:4]:1234",
				"ws://[5:6:7:8]:80",
				"ws://[9:10:11:12]:80",
			},
		},
		{
			"wss",
			[]string{
				"wss://host1:1234",
				"wss://host2:",
				"wss://host3",
				"wss://[1:2:3:4]:1234",
				"wss://[5:6:7:8]:",
				"wss://[9:10:11:12]",
			},
			[]string{
				"wss://host1:1234",
				"wss://host2:443",
				"wss://host3:443",
				"wss://[1:2:3:4]:1234",
				"wss://[5:6:7:8]:443",
				"wss://[9:10:11:12]:443",
			},
		},
	} {
		t.Run(test.name, func(t *testing.T) {
			opts := GetDefaultOptions()
			opts.NoRandomize = true
			opts.Servers = test.servers

			nc := &Conn{Opts: opts}
			if err := nc.setupServerPool(); err != nil {
				t.Fatalf("Problem setting up Server Pool: %v\n", err)
			}
			// Check server pool directly
			for i, u := range nc.srvPool {
				if u.url.String() != test.expected[i] {
					t.Fatalf("Expected url %q, got %q", test.expected[i], u.url.String())
				}
			}
		})
	}
}

func TestServersRandomize(t *testing.T) {
	opts := GetDefaultOptions()
	opts.Servers = testServers
	nc := &Conn{Opts: opts}
	if err := nc.setupServerPool(); err != nil {
		t.Fatalf("Problem setting up Server Pool: %v\n", err)
	}
	// Build []string from srvPool
	clientServers := []string{}
	for _, s := range nc.srvPool {
		clientServers = append(clientServers, s.url.String())
	}
	// In theory this could happen..
	if reflect.DeepEqual(testServers, clientServers) {
		t.Fatalf("ServerPool list not randomized\n")
	}

	// Now test that we do not randomize if proper flag is set.
	opts = GetDefaultOptions()
	opts.Servers = testServers
	opts.NoRandomize = true
	nc = &Conn{Opts: opts}
	if err := nc.setupServerPool(); err != nil {
		t.Fatalf("Problem setting up Server Pool: %v\n", err)
	}
	// Build []string from srvPool
	clientServers = []string{}
	for _, s := range nc.srvPool {
		clientServers = append(clientServers, s.url.String())
	}
	if !reflect.DeepEqual(testServers, clientServers) {
		t.Fatalf("ServerPool list should not be randomized\n")
	}

	// Although the original intent was that if Opts.Url is
	// set, Opts.Servers is not (and vice versa), the behavior
	// is that Opts.Url is always first, even when randomization
	// is enabled. So make sure that this is still the case.
	opts = GetDefaultOptions()
	opts.Url = DefaultURL
	opts.Servers = testServers
	nc = &Conn{Opts: opts}
	if err := nc.setupServerPool(); err != nil {
		t.Fatalf("Problem setting up Server Pool: %v\n", err)
	}
	// Build []string from srvPool
	clientServers = []string{}
	for _, s := range nc.srvPool {
		clientServers = append(clientServers, s.url.String())
	}
	// In theory this could happen..
	if reflect.DeepEqual(testServers, clientServers) {
		t.Fatalf("ServerPool list not randomized\n")
	}
	if clientServers[0] != DefaultURL {
		t.Fatalf("Options.Url should be first in the array, got %v", clientServers[0])
	}
}

func TestSelectNextServer(t *testing.T) {
	opts := GetDefaultOptions()
	opts.Servers = testServers
	opts.NoRandomize = true
	nc := &Conn{Opts: opts}
	if err := nc.setupServerPool(); err != nil {
		t.Fatalf("Problem setting up Server Pool: %v\n", err)
	}
	if nc.current != nc.srvPool[0] {
		t.Fatalf("Wrong default selection: %v\n", nc.current.url)
	}

	sel, err := nc.selectNextServer()
	if err != nil {
		t.Fatalf("Got an err: %v\n", err)
	}
	// Check that we are now looking at #2, and current is now last.
	if len(nc.srvPool) != len(testServers) {
		t.Fatalf("List is incorrect size: %d vs %d\n", len(nc.srvPool), len(testServers))
	}
	if nc.current.url.String() != testServers[1] {
		t.Fatalf("Selection incorrect: %v vs %v\n", nc.current.url, testServers[1])
	}
	if nc.srvPool[len(nc.srvPool)-1].url.String() != testServers[0] {
		t.Fatalf("Did not push old to last position\n")
	}
	if sel != nc.srvPool[0] {
		t.Fatalf("Did not return correct server: %v vs %v\n", sel.url, nc.srvPool[0].url)
	}

	// Test that we do not keep servers where we have tried to reconnect past our limit.
	nc.srvPool[0].reconnects = int(opts.MaxReconnect)
	if _, err := nc.selectNextServer(); err != nil {
		t.Fatalf("Got an err: %v\n", err)
	}
	// Check that we are now looking at #3, and current is not in the list.
	if len(nc.srvPool) != len(testServers)-1 {
		t.Fatalf("List is incorrect size: %d vs %d\n", len(nc.srvPool), len(testServers)-1)
	}
	if nc.current.url.String() != testServers[2] {
		t.Fatalf("Selection incorrect: %v vs %v\n", nc.current.url, testServers[2])
	}
	if nc.srvPool[len(nc.srvPool)-1].url.String() == testServers[1] {
		t.Fatalf("Did not throw away the last server correctly\n")
	}
}

// This will test that comma separated url strings work properly for
// the Connect() command.
func TestUrlArgument(t *testing.T) {
	check := func(url string, expected []string) {
		if !reflect.DeepEqual(processUrlString(url), expected) {
			t.Fatalf("Got wrong response processing URL: %q, RES: %#v\n", url, processUrlString(url))
		}
	}
	// This is normal case
	oneExpected := []string{"nats://localhost:1222"}

	check("nats://localhost:1222", oneExpected)
	check("nats://localhost:1222 ", oneExpected)
	check(" nats://localhost:1222", oneExpected)
	check(" nats://localhost:1222 ", oneExpected)

	var multiExpected = []string{
		"nats://localhost:1222",
		"nats://localhost:1223",
		"nats://localhost:1224",
	}

	check("nats://localhost:1222,nats://localhost:1223,nats://localhost:1224", multiExpected)
	check("nats://localhost:1222, nats://localhost:1223, nats://localhost:1224", multiExpected)
	check(" nats://localhost:1222, nats://localhost:1223, nats://localhost:1224 ", multiExpected)
	check("nats://localhost:1222,   nats://localhost:1223  ,nats://localhost:1224", multiExpected)
}

func TestParserPing(t *testing.T) {
	c := &Conn{}
	c.newReaderWriter()
	c.bw.switchToPending()

	c.ps = &parseState{}

	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}
	ping := []byte("PING\r\n")
	err := c.parse(ping[:1])
	if err != nil || c.ps.state != OP_P {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping[1:2])
	if err != nil || c.ps.state != OP_PI {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping[2:3])
	if err != nil || c.ps.state != OP_PIN {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping[3:4])
	if err != nil || c.ps.state != OP_PING {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping[4:5])
	if err != nil || c.ps.state != OP_PING {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping[5:6])
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(ping)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	// Should tolerate spaces
	ping = []byte("PING  \r")
	err = c.parse(ping)
	if err != nil || c.ps.state != OP_PING {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	c.ps.state = OP_START
	ping = []byte("PING  \r  \n")
	err = c.parse(ping)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
}

func TestParserErr(t *testing.T) {
	c := &Conn{}
	c.status = CLOSED
	c.newReaderWriter()
	c.bw.switchToPending()

	c.ps = &parseState{}

	// This test focuses on the parser only, not how the error is
	// actually processed by the upper layer.

	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}

	expectedError := "'Any kind of error'"
	errProto := []byte("-ERR  " + expectedError + "\r\n")
	err := c.parse(errProto[:1])
	if err != nil || c.ps.state != OP_MINUS {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[1:2])
	if err != nil || c.ps.state != OP_MINUS_E {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[2:3])
	if err != nil || c.ps.state != OP_MINUS_ER {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[3:4])
	if err != nil || c.ps.state != OP_MINUS_ERR {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[4:5])
	if err != nil || c.ps.state != OP_MINUS_ERR_SPC {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[5:6])
	if err != nil || c.ps.state != OP_MINUS_ERR_SPC {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}

	// Check with split arg buffer
	err = c.parse(errProto[6:7])
	if err != nil || c.ps.state != MINUS_ERR_ARG {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[7:10])
	if err != nil || c.ps.state != MINUS_ERR_ARG {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[10 : len(errProto)-2])
	if err != nil || c.ps.state != MINUS_ERR_ARG {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	if c.ps.argBuf == nil {
		t.Fatal("ArgBuf should not be nil")
	}
	s := string(c.ps.argBuf)
	if s != expectedError {
		t.Fatalf("Expected %v, got %v", expectedError, s)
	}
	err = c.parse(errProto[len(errProto)-2:])
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}

	// Check without split arg buffer
	errProto = []byte("-ERR 'Any error'\r\n")
	err = c.parse(errProto)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
}

func TestParserOK(t *testing.T) {
	c := &Conn{}
	c.ps = &parseState{}

	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}
	errProto := []byte("+OKay\r\n")
	err := c.parse(errProto[:1])
	if err != nil || c.ps.state != OP_PLUS {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[1:2])
	if err != nil || c.ps.state != OP_PLUS_O {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[2:3])
	if err != nil || c.ps.state != OP_PLUS_OK {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(errProto[3:])
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
}

func TestParserShouldFail(t *testing.T) {
	c := &Conn{}
	c.ps = &parseState{}

	if err := c.parse([]byte(" PING")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("POO")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("Px")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("PIx")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("PINx")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	// Stop here because 'PING' protos are tolerant for anything between PING and \n

	c.ps.state = OP_START
	if err := c.parse([]byte("POx")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("PONx")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	// Stop here because 'PONG' protos are tolerant for anything between PONG and \n

	c.ps.state = OP_START
	if err := c.parse([]byte("ZOO")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("Mx\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSx\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSGx\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG  foo\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG \r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG foo 1\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG foo bar 1\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG foo bar 1 baz\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("MSG foo 1 bar baz\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("+x\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("+Ox\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("-x\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("-Ex\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("-ERx\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
	c.ps.state = OP_START
	if err := c.parse([]byte("-ERRx\r\n")); err == nil {
		t.Fatal("Should have received a parse error")
	}
}

func TestParserSplitMsg(t *testing.T) {
	nc := &Conn{}
	nc.ps = &parseState{}

	buf := []byte("MSG a\r\n")
	err := nc.parse(buf)
	if err == nil {
		t.Fatal("Expected an error")
	}
	nc.ps = &parseState{}

	buf = []byte("MSG a b c\r\n")
	err = nc.parse(buf)
	if err == nil {
		t.Fatal("Expected an error")
	}
	nc.ps = &parseState{}

	expectedCount := uint64(1)
	expectedSize := uint64(3)

	buf = []byte("MSG a")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.argBuf == nil {
		t.Fatal("Arg buffer should have been created")
	}

	buf = []byte(" 1 3\r\nf")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.ma.size != 3 {
		t.Fatalf("Wrong msg size: %d instead of 3", nc.ps.ma.size)
	}
	if nc.ps.ma.sid != 1 {
		t.Fatalf("Wrong sid: %d instead of 1", nc.ps.ma.sid)
	}
	if string(nc.ps.ma.subject) != "a" {
		t.Fatalf("Wrong subject: '%s' instead of 'a'", string(nc.ps.ma.subject))
	}
	if nc.ps.msgBuf == nil {
		t.Fatal("Msg buffer should have been created")
	}

	buf = []byte("oo\r\n")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if (nc.Statistics.InMsgs != expectedCount) || (nc.Statistics.InBytes != expectedSize) {
		t.Fatalf("Wrong stats: %d - %d instead of %d - %d", nc.Statistics.InMsgs, nc.Statistics.InBytes, expectedCount, expectedSize)
	}
	if (nc.ps.argBuf != nil) || (nc.ps.msgBuf != nil) {
		t.Fatal("Buffers should be nil now")
	}

	buf = []byte("MSG a 1 3\r\nfo")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.ma.size != 3 {
		t.Fatalf("Wrong msg size: %d instead of 3", nc.ps.ma.size)
	}
	if nc.ps.ma.sid != 1 {
		t.Fatalf("Wrong sid: %d instead of 1", nc.ps.ma.sid)
	}
	if string(nc.ps.ma.subject) != "a" {
		t.Fatalf("Wrong subject: '%s' instead of 'a'", string(nc.ps.ma.subject))
	}
	if nc.ps.argBuf == nil {
		t.Fatal("Arg buffer should have been created")
	}
	if nc.ps.msgBuf == nil {
		t.Fatal("Msg buffer should have been created")
	}

	expectedCount++
	expectedSize += 3

	buf = []byte("o\r\n")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if (nc.Statistics.InMsgs != expectedCount) || (nc.Statistics.InBytes != expectedSize) {
		t.Fatalf("Wrong stats: %d - %d instead of %d - %d", nc.Statistics.InMsgs, nc.Statistics.InBytes, expectedCount, expectedSize)
	}
	if (nc.ps.argBuf != nil) || (nc.ps.msgBuf != nil) {
		t.Fatal("Buffers should be nil now")
	}

	buf = []byte("MSG a 1 6\r\nfo")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.ma.size != 6 {
		t.Fatalf("Wrong msg size: %d instead of 3", nc.ps.ma.size)
	}
	if nc.ps.ma.sid != 1 {
		t.Fatalf("Wrong sid: %d instead of 1", nc.ps.ma.sid)
	}
	if string(nc.ps.ma.subject) != "a" {
		t.Fatalf("Wrong subject: '%s' instead of 'a'", string(nc.ps.ma.subject))
	}
	if nc.ps.argBuf == nil {
		t.Fatal("Arg buffer should have been created")
	}
	if nc.ps.msgBuf == nil {
		t.Fatal("Msg buffer should have been created")
	}

	buf = []byte("ob")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}

	expectedCount++
	expectedSize += 6

	buf = []byte("ar\r\n")
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if (nc.Statistics.InMsgs != expectedCount) || (nc.Statistics.InBytes != expectedSize) {
		t.Fatalf("Wrong stats: %d - %d instead of %d - %d", nc.Statistics.InMsgs, nc.Statistics.InBytes, expectedCount, expectedSize)
	}
	if (nc.ps.argBuf != nil) || (nc.ps.msgBuf != nil) {
		t.Fatal("Buffers should be nil now")
	}

	// Let's have a msg that is bigger than the parser's scratch size.
	// Since we prepopulate the msg with 'foo', adding 3 to the size.
	msgSize := cap(nc.ps.scratch) + 100 + 3
	buf = []byte(fmt.Sprintf("MSG a 1 b %d\r\nfoo", msgSize))
	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.ma.size != msgSize {
		t.Fatalf("Wrong msg size: %d instead of %d", nc.ps.ma.size, msgSize)
	}
	if nc.ps.ma.sid != 1 {
		t.Fatalf("Wrong sid: %d instead of 1", nc.ps.ma.sid)
	}
	if string(nc.ps.ma.subject) != "a" {
		t.Fatalf("Wrong subject: '%s' instead of 'a'", string(nc.ps.ma.subject))
	}
	if string(nc.ps.ma.reply) != "b" {
		t.Fatalf("Wrong reply: '%s' instead of 'b'", string(nc.ps.ma.reply))
	}
	if nc.ps.argBuf == nil {
		t.Fatal("Arg buffer should have been created")
	}
	if nc.ps.msgBuf == nil {
		t.Fatal("Msg buffer should have been created")
	}

	expectedCount++
	expectedSize += uint64(msgSize)

	bufSize := msgSize - 3

	buf = make([]byte, bufSize)
	for i := 0; i < bufSize; i++ {
		buf[i] = byte('a' + (i % 26))
	}

	err = nc.parse(buf)
	if err != nil {
		t.Fatalf("Parser error: %v", err)
	}
	if nc.ps.state != MSG_PAYLOAD {
		t.Fatalf("Wrong state: %v instead of %v", nc.ps.state, MSG_PAYLOAD)
	}
	if nc.ps.ma.size != msgSize {
		t.Fatalf("Wrong (ma) msg size: %d instead of %d", nc.ps.ma.size, msgSize)
	}
	if len(nc.ps.msgBuf) != msgSize {
		t.Fatalf("Wrong msg size: %d instead of %d", len(nc.ps.msgBuf), msgSize)
	}
	// Check content:
	if string(nc.ps.msgBuf[0:3]) != "foo" {
		t.Fatalf("Wrong msg content: %s", string(nc.ps.msgBuf))
	}
	for k := 3; k < nc.ps.ma.size; k++ {
		if nc.ps.msgBuf[k] != byte('a'+((k-3)%26)) {
			t.Fatalf("Wrong msg content: %s", string(nc.ps.msgBuf))
		}
	}

	buf = []byte("\r\n")
	if err := nc.parse(buf); err != nil {
		t.Fatalf("Unexpected error during parsing: %v", err)
	}
	if (nc.Statistics.InMsgs != expectedCount) || (nc.Statistics.InBytes != expectedSize) {
		t.Fatalf("Wrong stats: %d - %d instead of %d - %d", nc.Statistics.InMsgs, nc.Statistics.InBytes, expectedCount, expectedSize)
	}
	if (nc.ps.argBuf != nil) || (nc.ps.msgBuf != nil) {
		t.Fatal("Buffers should be nil now")
	}
	if nc.ps.state != OP_START {
		t.Fatalf("Wrong state: %v", nc.ps.state)
	}
}

func TestNormalizeError(t *testing.T) {
	expected := "Typical Error"
	if s := normalizeErr("-ERR '" + expected + "'"); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}

	expected = "Trim Surrounding Spaces"
	if s := normalizeErr("-ERR    '" + expected + "'   "); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}

	expected = "Trim Surrounding Spaces Without Quotes"
	if s := normalizeErr("-ERR    " + expected + "   "); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}

	expected = "Error Without Quotes"
	if s := normalizeErr("-ERR " + expected); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}

	expected = "Error With Quote Only On Left"
	if s := normalizeErr("-ERR '" + expected); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}

	expected = "Error With Quote Only On Right"
	if s := normalizeErr("-ERR " + expected + "'"); s != expected {
		t.Fatalf("Expected '%s', got '%s'", expected, s)
	}
}

func TestAsyncINFO(t *testing.T) {
	opts := GetDefaultOptions()
	c := &Conn{Opts: opts}

	c.ps = &parseState{}

	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}

	info := []byte("INFO {}\r\n")
	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}
	err := c.parse(info[:1])
	if err != nil || c.ps.state != OP_I {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(info[1:2])
	if err != nil || c.ps.state != OP_IN {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(info[2:3])
	if err != nil || c.ps.state != OP_INF {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(info[3:4])
	if err != nil || c.ps.state != OP_INFO {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(info[4:5])
	if err != nil || c.ps.state != OP_INFO_SPC {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	err = c.parse(info[5:])
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}

	// All at once
	err = c.parse(info)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}

	// Server pool needs to be setup
	c.setupServerPool()

	// Partials requiring argBuf
	expectedServer := serverInfo{
		ID:           "test",
		Host:         "localhost",
		Port:         4222,
		AuthRequired: true,
		TLSRequired:  true,
		MaxPayload:   2 * 1024 * 1024,
		ConnectURLs:  []string{"localhost:5222", "localhost:6222"},
	}
	// Set NoRandomize so that the check with expectedServer info
	// matches.
	c.Opts.NoRandomize = true

	b, _ := json.Marshal(expectedServer)
	info = []byte(fmt.Sprintf("INFO %s\r\n", b))
	if c.ps.state != OP_START {
		t.Fatalf("Expected OP_START vs %d\n", c.ps.state)
	}
	err = c.parse(info[:9])
	if err != nil || c.ps.state != INFO_ARG || c.ps.argBuf == nil {
		t.Fatalf("Unexpected: %d err: %v argBuf: %v\n", c.ps.state, err, c.ps.argBuf)
	}
	err = c.parse(info[9:11])
	if err != nil || c.ps.state != INFO_ARG || c.ps.argBuf == nil {
		t.Fatalf("Unexpected: %d err: %v argBuf: %v\n", c.ps.state, err, c.ps.argBuf)
	}
	err = c.parse(info[11:])
	if err != nil || c.ps.state != OP_START || c.ps.argBuf != nil {
		t.Fatalf("Unexpected: %d err: %v argBuf: %v\n", c.ps.state, err, c.ps.argBuf)
	}
	if !reflect.DeepEqual(c.info, expectedServer) {
		t.Fatalf("Expected server info to be: %v, got: %v", expectedServer, c.info)
	}

	// Good INFOs
	good := []string{"INFO {}\r\n", "INFO  {}\r\n", "INFO {} \r\n", "INFO { \"server_id\": \"test\"  }   \r\n", "INFO {\"connect_urls\":[]}\r\n"}
	for _, gi := range good {
		c.ps = &parseState{}
		err = c.parse([]byte(gi))
		if err != nil || c.ps.state != OP_START {
			t.Fatalf("Protocol %q should be fine. Err=%v state=%v", gi, err, c.ps.state)
		}
	}

	// Wrong INFOs
	wrong := []string{"IxNFO {}\r\n", "INxFO {}\r\n", "INFxO {}\r\n", "INFOx {}\r\n", "INFO{}\r\n", "INFO {}"}
	for _, wi := range wrong {
		c.ps = &parseState{}
		err = c.parse([]byte(wi))
		if err == nil && c.ps.state == OP_START {
			t.Fatalf("Protocol %q should have failed", wi)
		}
	}

	checkPool := func(urls ...string) {
		// Check both pool and urls map
		if len(c.srvPool) != len(urls) {
			stackFatalf(t, "Pool should have %d elements, has %d", len(urls), len(c.srvPool))
		}
		if len(c.urls) != len(urls) {
			stackFatalf(t, "Map should have %d elements, has %d", len(urls), len(c.urls))
		}
		for _, url := range urls {
			if _, present := c.urls[url]; !present {
				stackFatalf(t, "Pool should have %q", url)
			}
		}
	}

	// Now test the decoding of "connect_urls"

	// Reset the pool
	c.setupServerPool()
	// Reinitialize the parser
	c.ps = &parseState{}

	info = []byte("INFO {\"connect_urls\":[\"localhost:4222\", \"localhost:5222\"]}\r\n")
	err = c.parse(info)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	// Pool now should contain 127.0.0.1:4222 (the default URL), localhost:4222 and localhost:5222
	checkPool("127.0.0.1:4222", "localhost:4222", "localhost:5222")

	// Make sure that if client receives the same, it is not added again.
	err = c.parse(info)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	// Pool should still contain 127.0.0.1:4222 (the default URL), localhost:4222 and localhost:5222
	checkPool("127.0.0.1:4222", "localhost:4222", "localhost:5222")

	// Receive a new URL
	info = []byte("INFO {\"connect_urls\":[\"localhost:4222\", \"localhost:5222\", \"localhost:6222\"]}\r\n")
	err = c.parse(info)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	// Pool now should contain 127.0.0.1:4222 (the default URL), localhost:4222, localhost:5222 and localhost:6222
	checkPool("127.0.0.1:4222", "localhost:4222", "localhost:5222", "localhost:6222")

	// Check that pool may be randomized on setup, but new URLs are always
	// added at end of pool.
	c.Opts.NoRandomize = false
	c.Opts.Servers = testServers
	// Reset the pool
	c.setupServerPool()
	// Reinitialize the parser
	c.ps = &parseState{}
	// Capture the pool sequence after randomization
	urlsAfterPoolSetup := make([]string, 0, len(c.srvPool))
	for _, srv := range c.srvPool {
		urlsAfterPoolSetup = append(urlsAfterPoolSetup, srv.url.Host)
	}
	checkNewURLsAddedRandomly := func() {
		t.Helper()
		var ok bool
		for i := 0; i < len(urlsAfterPoolSetup); i++ {
			if c.srvPool[i].url.Host != urlsAfterPoolSetup[i] {
				ok = true
				break
			}
		}
		if !ok {
			t.Fatalf("New URLs were not added randmonly: %q", c.Servers())
		}
	}
	// Add new urls
	newURLs := "\"impA:4222\", \"impB:4222\", \"impC:4222\", " +
		"\"impD:4222\", \"impE:4222\", \"impF:4222\", \"impG:4222\", " +
		"\"impH:4222\", \"impI:4222\", \"impJ:4222\""
	info = []byte("INFO {\"connect_urls\":[" + newURLs + "]}\r\n")
	err = c.parse(info)
	if err != nil || c.ps.state != OP_START {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	checkNewURLsAddedRandomly()
	// Check that we have not moved the first URL
	if u := c.srvPool[0].url.Host; u != urlsAfterPoolSetup[0] {
		t.Fatalf("Expected first URL to be %q, got %q", urlsAfterPoolSetup[0], u)
	}
}

func TestConnServers(t *testing.T) {
	opts := GetDefaultOptions()
	c := &Conn{Opts: opts}
	c.ps = &parseState{}
	c.setupServerPool()

	validateURLs := func(serverUrls []string, expectedUrls ...string) {
		var found bool
		if len(serverUrls) != len(expectedUrls) {
			stackFatalf(t, "Array should have %d elements, has %d", len(expectedUrls), len(serverUrls))
		}

		for _, ev := range expectedUrls {
			found = false
			for _, av := range serverUrls {
				if ev == av {
					found = true
					break
				}
			}
			if !found {
				stackFatalf(t, "array is missing %q in %v", ev, serverUrls)
			}
		}
	}

	// check the default url
	validateURLs(c.Servers(), "nats://127.0.0.1:4222")
	if len(c.DiscoveredServers()) != 0 {
		t.Fatalf("Expected no discovered servers")
	}

	// Add a new URL
	err := c.parse([]byte("INFO {\"connect_urls\":[\"localhost:5222\"]}\r\n"))
	if err != nil {
		t.Fatalf("Unexpected: %d : %v\n", c.ps.state, err)
	}
	// Server list should now contain both the default and the new url.
	validateURLs(c.Servers(), "nats://127.0.0.1:4222", "nats://localhost:5222")
	// Discovered servers should only contain the new url.
	validateURLs(c.DiscoveredServers(), "nats://localhost:5222")

	// verify user credentials are stripped out.
	opts.Servers = []string{"nats://user:pass@localhost:4333", "nats://token@localhost:4444"}
	c = &Conn{Opts: opts}
	c.ps = &parseState{}
	c.setupServerPool()

	validateURLs(c.Servers(), "nats://localhost:4333", "nats://localhost:4444")
}

func TestConnAsyncCBDeadlock(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	ch := make(chan bool)
	o := GetDefaultOptions()
	o.Url = fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)
	o.ClosedCB = func(_ *Conn) {
		ch <- true
	}
	o.AsyncErrorCB = func(nc *Conn, sub *Subscription, err error) {
		// do something with nc that requires locking behind the scenes
		_ = nc.LastError()
	}
	nc, err := o.Connect()
	if err != nil {
		t.Fatalf("Should have connected ok: %v", err)
	}

	total := 300
	wg := &sync.WaitGroup{}
	wg.Add(total)
	for i := 0; i < total; i++ {
		go func() {
			// overwhelm asyncCB with errors
			nc.processErr(AUTHORIZATION_ERR)
			wg.Done()
		}()
	}
	wg.Wait()

	nc.Close()
	if e := Wait(ch); e != nil {
		t.Fatal("Deadlock")
	}
}

func TestPingTimerLeakedOnClose(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	nc.Close()
	// There was a bug (issue #338) that if connection
	// was created and closed quickly, the pinger would
	// be created from a go-routine and would cause the
	// connection object to be retained until the ping
	// timer fired.
	// Wait a little bit and check if the timer is set.
	// With the defect it would be.
	time.Sleep(100 * time.Millisecond)
	nc.mu.Lock()
	pingTimerSet := nc.ptmr != nil
	nc.mu.Unlock()
	if pingTimerSet {
		t.Fatal("Pinger timer should not be set")
	}
}

func TestNoEcho(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	url := fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)

	nc, err := Connect(url, NoEcho())
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	r := int32(0)
	_, err = nc.Subscribe("foo", func(m *Msg) {
		atomic.AddInt32(&r, 1)
	})
	if err != nil {
		t.Fatalf("Error on subscribe: %v", err)
	}

	err = nc.Publish("foo", []byte("Hello World"))
	if err != nil {
		t.Fatalf("Error on publish: %v", err)
	}
	nc.Flush()
	nc.Flush()

	if nr := atomic.LoadInt32(&r); nr != 0 {
		t.Fatalf("Expected no messages echoed back, received %d\n", nr)
	}
}

func TestNoEchoOldServer(t *testing.T) {
	opts := GetDefaultOptions()
	opts.Url = DefaultURL
	opts.NoEcho = true

	nc := &Conn{Opts: opts}
	if err := nc.setupServerPool(); err != nil {
		t.Fatalf("Problem setting up Server Pool: %v\n", err)
	}

	// Old style with no proto, meaning 0. We need Proto:1 for NoEcho support.
	oldInfo := "{\"server_id\":\"22\",\"version\":\"1.1.0\",\"go\":\"go1.10.2\",\"port\":4222,\"max_payload\":1048576}"

	err := nc.processInfo(oldInfo)
	if err != nil {
		t.Fatalf("Error processing old style INFO: %v\n", err)
	}

	// Make sure connectProto generates an error.
	_, err = nc.connectProto()
	if err == nil {
		t.Fatalf("Expected an error but got none\n")
	}
}

// Trust Server Tests

var (
	oSeed = []byte("SOAL7GTNI66CTVVNXBNQMG6V2HTDRWC3HGEP7D2OUTWNWSNYZDXWFOX4SU")
	aSeed = []byte("SAAASUPRY3ONU4GJR7J5RUVYRUFZXG56F4WEXELLLORQ65AEPSMIFTOJGE")
	uSeed = []byte("SUAMK2FG4MI6UE3ACF3FK3OIQBCEIEZV7NSWFFEW63UXMRLFM2XLAXK4GY")

	aJWT = "eyJ0eXAiOiJqd3QiLCJhbGciOiJlZDI1NTE5In0.eyJqdGkiOiJLWjZIUVRXRlY3WkRZSFo3NklRNUhPM0pINDVRNUdJS0JNMzJTSENQVUJNNk5PNkU3TUhRIiwiaWF0IjoxNTQ0MDcxODg5LCJpc3MiOiJPRDJXMkk0TVZSQTVUR1pMWjJBRzZaSEdWTDNPVEtGV1FKRklYNFROQkVSMjNFNlA0NlMzNDVZWSIsInN1YiI6IkFBUFFKUVVQS1ZYR1c1Q1pINUcySEZKVUxZU0tERUxBWlJWV0pBMjZWRFpPN1dTQlVOSVlSRk5RIiwidHlwZSI6ImFjY291bnQiLCJuYXRzIjp7ImxpbWl0cyI6eyJzdWJzIjotMSwiY29ubiI6LTEsImltcG9ydHMiOi0xLCJleHBvcnRzIjotMSwiZGF0YSI6LTEsInBheWxvYWQiOi0xLCJ3aWxkY2FyZHMiOnRydWV9fX0.8o35JPQgvhgFT84Bi2Z-zAeSiLrzzEZn34sgr1DIBEDTwa-EEiMhvTeos9cvXxoZVCCadqZxAWVwS6paAMj8Bg"

	uJWT = "eyJ0eXAiOiJqd3QiLCJhbGciOiJlZDI1NTE5In0.eyJqdGkiOiJBSFQzRzNXRElDS1FWQ1FUWFJUTldPRlVVUFRWNE00RFZQV0JGSFpJQUROWEZIWEpQR0FBIiwiaWF0IjoxNTQ0MDcxODg5LCJpc3MiOiJBQVBRSlFVUEtWWEdXNUNaSDVHMkhGSlVMWVNLREVMQVpSVldKQTI2VkRaTzdXU0JVTklZUkZOUSIsInN1YiI6IlVBVDZCV0NTQ1dMVUtKVDZLNk1CSkpPRU9UWFo1QUpET1lLTkVWUkZDN1ZOTzZPQTQzTjRUUk5PIiwidHlwZSI6InVzZXIiLCJuYXRzIjp7InB1YiI6e30sInN1YiI6e319fQ._8A1XM88Q2kp7XVJZ42bQuO9E3QPsNAGKtVjAkDycj8A5PtRPby9UpqBUZzBwiJQQO3TUcD5GGqSvsMm6X8hCQ"

	chained = `
-----BEGIN NATS USER JWT-----
eyJ0eXAiOiJqd3QiLCJhbGciOiJlZDI1NTE5In0.eyJqdGkiOiJBSFQzRzNXRElDS1FWQ1FUWFJUTldPRlVVUFRWNE00RFZQV0JGSFpJQUROWEZIWEpQR0FBIiwiaWF0IjoxNTQ0MDcxODg5LCJpc3MiOiJBQVBRSlFVUEtWWEdXNUNaSDVHMkhGSlVMWVNLREVMQVpSVldKQTI2VkRaTzdXU0JVTklZUkZOUSIsInN1YiI6IlVBVDZCV0NTQ1dMVUtKVDZLNk1CSkpPRU9UWFo1QUpET1lLTkVWUkZDN1ZOTzZPQTQzTjRUUk5PIiwidHlwZSI6InVzZXIiLCJuYXRzIjp7InB1YiI6e30sInN1YiI6e319fQ._8A1XM88Q2kp7XVJZ42bQuO9E3QPsNAGKtVjAkDycj8A5PtRPby9UpqBUZzBwiJQQO3TUcD5GGqSvsMm6X8hCQ
------END NATS USER JWT------

************************* IMPORTANT *************************
NKEY Seed printed below can be used to sign and prove identity.
NKEYs are sensitive and should be treated as secrets.

-----BEGIN USER NKEY SEED-----
SUAMK2FG4MI6UE3ACF3FK3OIQBCEIEZV7NSWFFEW63UXMRLFM2XLAXK4GY
------END USER NKEY SEED------
`
)

func runTrustServer() *server.Server {
	kp, _ := nkeys.FromSeed(oSeed)
	pub, _ := kp.PublicKey()
	opts := natsserver.DefaultTestOptions
	opts.Port = TEST_PORT
	opts.TrustedKeys = []string{string(pub)}
	s := RunServerWithOptions(&opts)
	mr := &server.MemAccResolver{}
	akp, _ := nkeys.FromSeed(aSeed)
	apub, _ := akp.PublicKey()
	mr.Store(string(apub), aJWT)
	s.SetAccountResolver(mr)
	return s
}

func TestBasicUserJWTAuth(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}
	ts := runTrustServer()
	defer ts.Shutdown()

	url := fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)
	_, err := Connect(url)
	if err == nil {
		t.Fatalf("Expecting an error on connect")
	}

	jwtCB := func() (string, error) {
		return uJWT, nil
	}
	sigCB := func(nonce []byte) ([]byte, error) {
		kp, _ := nkeys.FromSeed(uSeed)
		sig, _ := kp.Sign(nonce)
		return sig, nil
	}

	// Try with user jwt but no sig
	_, err = Connect(url, UserJWT(jwtCB, nil))
	if err == nil {
		t.Fatalf("Expecting an error on connect")
	}

	// Try with user callback
	_, err = Connect(url, UserJWT(nil, sigCB))
	if err == nil {
		t.Fatalf("Expecting an error on connect")
	}

	nc, err := Connect(url, UserJWT(jwtCB, sigCB))
	if err != nil {
		t.Fatalf("Expected to connect, got %v", err)
	}
	nc.Close()
}

func TestUserCredentialsTwoFiles(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}
	ts := runTrustServer()
	defer ts.Shutdown()

	userJWTFile := createTmpFile(t, []byte(uJWT))
	defer os.Remove(userJWTFile)
	userSeedFile := createTmpFile(t, uSeed)
	defer os.Remove(userSeedFile)

	url := fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)
	nc, err := Connect(url, UserCredentials(userJWTFile, userSeedFile))
	if err != nil {
		t.Fatalf("Expected to connect, got %v", err)
	}
	nc.Close()
}

func TestUserCredentialsChainedFile(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}
	ts := runTrustServer()
	defer ts.Shutdown()

	chainedFile := createTmpFile(t, []byte(chained))
	defer os.Remove(chainedFile)

	url := fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)
	nc, err := Connect(url, UserCredentials(chainedFile))
	if err != nil {
		t.Fatalf("Expected to connect, got %v", err)
	}
	nc.Close()

	chainedFile = createTmpFile(t, []byte("invalid content"))
	defer os.Remove(chainedFile)
	nc, err = Connect(url, UserCredentials(chainedFile))
	if err == nil || !strings.Contains(err.Error(),
		"error signing nonce: unable to extract key pair from file") {
		if nc != nil {
			nc.Close()
		}
		t.Fatalf("Expected error about invalid creds file, got %q", err)
	}
}

func TestUserJWTAndSeed(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}
	ts := runTrustServer()
	defer ts.Shutdown()

	url := fmt.Sprintf("nats://127.0.0.1:%d", TEST_PORT)
	nc, err := Connect(url, UserJWTAndSeed(uJWT, string(uSeed)))
	if err != nil {
		t.Fatalf("Expected to connect, got %v", err)
	}
	nc.Close()
}

func TestExpiredAuthentication(t *testing.T) {
	// The goal of these tests was to check how a client with an expiring JWT
	// behaves. It should receive an async -ERR indicating that the auth
	// has expired, which will trigger reconnects. There, the lib should
	// received -ERR for auth violation in response to the CONNECT (instead
	// of the PONG). The library should close the connection after receiving
	// twice the same auth error.
	// If we use an actual JWT that expires, the way the JWT library expires
	// a JWT cause the server to send the async -ERR first but then accepts
	// the CONNECT (since JWT lib does not say that it has expired), but
	// when the server sets up the expire callback, that callback fires right
	// away and so client receives async -ERR again.
	// So for a deterministic test, we won't use an actual NATS Server.
	// Instead, we will use a mock that simply returns appropriate -ERR and
	// ensure the client behaves as expected.
	for _, test := range []struct {
		name          string
		expectedProto string
		expectedErr   error
		ignoreAbort   bool
	}{
		{"expired users credentials", AUTHENTICATION_EXPIRED_ERR, ErrAuthExpired, false},
		{"revoked users credentials", AUTHENTICATION_REVOKED_ERR, ErrAuthRevoked, false},
		{"expired account", ACCOUNT_AUTHENTICATION_EXPIRED_ERR, ErrAccountAuthExpired, false},
		{"expired users credentials", AUTHENTICATION_EXPIRED_ERR, ErrAuthExpired, true},
		{"revoked users credentials", AUTHENTICATION_REVOKED_ERR, ErrAuthRevoked, true},
		{"expired account", ACCOUNT_AUTHENTICATION_EXPIRED_ERR, ErrAccountAuthExpired, true},
	} {
		t.Run(test.name, func(t *testing.T) {
			l, e := net.Listen("tcp", "127.0.0.1:0")
			if e != nil {
				t.Fatal("Could not listen on an ephemeral port")
			}
			tl := l.(*net.TCPListener)
			defer tl.Close()

			addr := tl.Addr().(*net.TCPAddr)

			wg := sync.WaitGroup{}
			wg.Add(1)

			go func() {
				defer wg.Done()
				connect := 0
				for {
					conn, err := l.Accept()
					if err != nil {
						return
					}
					defer conn.Close()

					info := "INFO {\"server_id\":\"foobar\",\"nonce\":\"anonce\"}\r\n"
					conn.Write([]byte(info))

					// Read connect and ping commands sent from the client
					br := bufio.NewReaderSize(conn, 10*1024)
					br.ReadLine()
					br.ReadLine()

					if connect++; connect == 1 {
						conn.Write([]byte(fmt.Sprintf("%s%s", _PONG_OP_, _CRLF_)))
						time.Sleep(300 * time.Millisecond)
						conn.Write([]byte(fmt.Sprintf("-ERR '%s'\r\n", test.expectedProto)))
					} else {
						conn.Write([]byte(fmt.Sprintf("-ERR '%s'\r\n", AUTHORIZATION_ERR)))
					}
					conn.Close()
				}
			}()

			ch := make(chan bool)
			errCh := make(chan error, 10)

			url := fmt.Sprintf("nats://127.0.0.1:%d", addr.Port)
			opts := []Option{
				ReconnectWait(25 * time.Millisecond),
				ReconnectJitter(0, 0),
				MaxReconnects(-1),
				ErrorHandler(func(_ *Conn, _ *Subscription, e error) {
					select {
					case errCh <- e:
					default:
					}
				}),
				ClosedHandler(func(nc *Conn) {
					ch <- true
				}),
			}
			if test.ignoreAbort {
				opts = append(opts, IgnoreAuthErrorAbort())
			}
			nc, err := Connect(url, opts...)
			if err != nil {
				t.Fatalf("Expected to connect, got %v", err)
			}
			defer nc.Close()

			if test.ignoreAbort {
				// We expect more than 3 errors, as the connect attempt should not be aborted after 2 failed attempts.
				for i := 0; i < 4; i++ {
					select {
					case e := <-errCh:
						if i == 0 && e != test.expectedErr {
							t.Fatalf("Expected error %q, got %q", test.expectedErr, e)
						} else if i > 0 && e != ErrAuthorization {
							t.Fatalf("Expected error %q, got %q", ErrAuthorization, e)
						}
					case <-time.After(time.Second):
						if i == 0 {
							t.Fatalf("Missing %q error", test.expectedErr)
						} else {
							t.Fatalf("Missing %q error", ErrAuthorization)
						}
					}
				}
				return
			}
			// We should give up since we get the same error on both tries.
			if err := WaitTime(ch, 2*time.Second); err != nil {
				t.Fatal("Should have closed after multiple failed attempts.")
			}
			if stats := nc.Stats(); stats.Reconnects > 2 {
				t.Fatalf("Expected at most 2 reconnects, got %d", stats.Reconnects)
			}

			// We expect 3 errors, the expired auth/revoke error, then 2 AUTHORIZATION_ERR
			// before the connection is closed.
			for i := 0; i < 3; i++ {
				select {
				case e := <-errCh:
					if i == 0 && e != test.expectedErr {
						t.Fatalf("Expected error %q, got %q", test.expectedErr, e)
					} else if i > 0 && e != ErrAuthorization {
						t.Fatalf("Expected error %q, got %q", ErrAuthorization, e)
					}
				default:
					if i == 0 {
						t.Fatalf("Missing %q error", test.expectedErr)
					} else {
						t.Fatalf("Missing %q error", ErrAuthorization)
					}
				}
			}
			// We should not have any more error
			select {
			case e := <-errCh:
				t.Fatalf("Extra error: %v", e)
			default:
			}
			// Close the listener and wait for go routine to end.
			l.Close()
			wg.Wait()
		})
	}
}

// If we are using TLS and have multiple servers we try to match the IP
// from a discovered server with the expected hostname for certs without IP
// designations. In certain cases where there is a not authorized error and
// we were trying the second server with the IP only and getting an error
// that was hard to understand for the end user. This did require
// Opts.Secure = false, but the fix removed the check on Opts.Secure to decide
// if we need to save off the hostname that we connected to first.
func TestUserCredentialsChainedFileNotFoundError(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}
	// Setup opts for both servers.
	kp, _ := nkeys.FromSeed(oSeed)
	pub, _ := kp.PublicKey()
	opts := natsserver.DefaultTestOptions
	opts.Port = -1
	opts.Cluster.Port = -1
	opts.TrustedKeys = []string{string(pub)}
	tc := &server.TLSConfigOpts{
		CertFile: "./test/configs/certs/server_noip.pem",
		KeyFile:  "./test/configs/certs/key_noip.pem",
	}
	var err error
	if opts.TLSConfig, err = server.GenTLSConfig(tc); err != nil {
		panic("Can't build TLCConfig")
	}

	// copy the opts for the second server.
	opts2 := opts

	sa := RunServerWithOptions(&opts)
	defer sa.Shutdown()

	routeAddr := fmt.Sprintf("nats-route://%s:%d", opts.Cluster.Host, opts.Cluster.Port)
	rurl, _ := url.Parse(routeAddr)
	opts2.Routes = []*url.URL{rurl}

	sb := RunServerWithOptions(&opts2)
	defer sb.Shutdown()

	wait := time.Now().Add(2 * time.Second)
	for time.Now().Before(wait) {
		sanr := sa.NumRoutes()
		sbnr := sb.NumRoutes()
		if sanr == 1 && sbnr == 1 {
			break
		}
		time.Sleep(50 * time.Millisecond)
	}

	// Make sure we get the right error here.
	nc, err := Connect(fmt.Sprintf("nats://localhost:%d", opts.Port),
		RootCAs("./test/configs/certs/ca.pem"),
		UserCredentials("filenotfound.creds"))

	if err == nil {
		nc.Close()
		t.Fatalf("Expected an error on missing credentials file")
	}
	if !strings.Contains(err.Error(), "no such file or directory") &&
		!strings.Contains(err.Error(), "The system cannot find the file specified") {
		t.Fatalf("Expected a missing file error, got %q", err)
	}
}

func TestNkeyAuth(t *testing.T) {
	if server.VERSION[0] == '1' {
		t.Skip()
	}

	seed := []byte("SUAKYRHVIOREXV7EUZTBHUHL7NUMHPMAS7QMDU3GTIUWEI5LDNOXD43IZY")
	kp, _ := nkeys.FromSeed(seed)
	pub, _ := kp.PublicKey()

	sopts := natsserver.DefaultTestOptions
	sopts.Port = TEST_PORT
	sopts.Nkeys = []*server.NkeyUser{{Nkey: string(pub)}}
	ts := RunServerWithOptions(&sopts)
	defer ts.Shutdown()

	opts := reconnectOpts
	if _, err := opts.Connect(); err == nil {
		t.Fatalf("Expected to fail with no nkey auth defined")
	}
	opts.Nkey = string(pub)
	if _, err := opts.Connect(); err != ErrNkeyButNoSigCB {
		t.Fatalf("Expected to fail with nkey defined but no signature callback, got %v", err)
	}
	badSign := func(nonce []byte) ([]byte, error) {
		return []byte("VALID?"), nil
	}
	opts.SignatureCB = badSign
	if _, err := opts.Connect(); err == nil {
		t.Fatalf("Expected to fail with nkey and bad signature callback")
	}
	goodSign := func(nonce []byte) ([]byte, error) {
		sig, err := kp.Sign(nonce)
		if err != nil {
			t.Fatalf("Failed signing nonce: %v", err)
		}
		return sig, nil
	}
	opts.SignatureCB = goodSign
	nc, err := opts.Connect()
	if err != nil {
		t.Fatalf("Expected to succeed but got %v", err)
	}
	defer nc.Close()

	// Now disconnect by killing the server and restarting.
	ts.Shutdown()
	ts = RunServerWithOptions(&sopts)
	defer ts.Shutdown()

	if err := nc.FlushTimeout(5 * time.Second); err != nil {
		t.Fatalf("Error on Flush: %v", err)
	}
}

func createTmpFile(t *testing.T, content []byte) string {
	t.Helper()
	conf, err := os.CreateTemp("", "")
	if err != nil {
		t.Fatalf("Error creating conf file: %v", err)
	}
	fName := conf.Name()
	conf.Close()
	if err := os.WriteFile(fName, content, 0666); err != nil {
		os.Remove(fName)
		t.Fatalf("Error writing conf file: %v", err)
	}
	return fName
}

func TestNKeyOptionFromSeed(t *testing.T) {
	if _, err := NkeyOptionFromSeed("file_that_does_not_exist"); err == nil {
		t.Fatal("Expected error got none")
	}

	seedFile := createTmpFile(t, []byte(`
		# No seed
		THIS_NOT_A_NKEY_SEED
	`))
	defer os.Remove(seedFile)
	if _, err := NkeyOptionFromSeed(seedFile); err == nil || !strings.Contains(err.Error(), "seed found") {
		t.Fatalf("Expected error about seed not found, got %v", err)
	}
	os.Remove(seedFile)

	seedFile = createTmpFile(t, []byte(`
		# Invalid seed
		SUBADSEED
	`))
	// Make sure that we detect SU (trim space) but it still fails because
	// this is not a valid NKey.
	if _, err := NkeyOptionFromSeed(seedFile); err == nil || strings.Contains(err.Error(), "seed found") {
		t.Fatalf("Expected error about invalid key, got %v", err)
	}
	os.Remove(seedFile)

	kp, _ := nkeys.CreateUser()
	seed, _ := kp.Seed()
	seedFile = createTmpFile(t, seed)
	opt, err := NkeyOptionFromSeed(seedFile)
	if err != nil {
		t.Fatalf("Error: %v", err)
	}

	l, e := net.Listen("tcp", "127.0.0.1:0")
	if e != nil {
		t.Fatal("Could not listen on an ephemeral port")
	}
	tl := l.(*net.TCPListener)
	defer tl.Close()

	addr := tl.Addr().(*net.TCPAddr)

	ch := make(chan bool, 1)
	errCh := make(chan error, 1)
	rs := func(ch chan bool) {
		conn, err := l.Accept()
		if err != nil {
			errCh <- fmt.Errorf("error accepting client connection: %v", err)
			return
		}
		defer conn.Close()
		info := "INFO {\"server_id\":\"foobar\",\"nonce\":\"anonce\"}\r\n"
		conn.Write([]byte(info))

		// Read connect and ping commands sent from the client
		br := bufio.NewReaderSize(conn, 10*1024)
		line, _, err := br.ReadLine()
		if err != nil {
			errCh <- fmt.Errorf("expected CONNECT and PING from client, got: %s", err)
			return
		}
		// If client got an error reading the seed, it will not send it
		if bytes.Contains(line, []byte(`"sig":`)) {
			conn.Write([]byte("PONG\r\n"))
		} else {
			conn.Write([]byte(`-ERR go away\r\n`))
			conn.Close()
		}
		// Now wait to be notified that we can finish
		<-ch
		errCh <- nil
	}
	go rs(ch)

	nc, err := Connect(fmt.Sprintf("nats://127.0.0.1:%d", addr.Port), opt)
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	nc.Close()
	close(ch)

	checkErrChannel(t, errCh)

	// Now that option is already created, change content of file
	os.WriteFile(seedFile, []byte(`xxxxx`), 0666)
	ch = make(chan bool, 1)
	go rs(ch)

	if _, err := Connect(fmt.Sprintf("nats://127.0.0.1:%d", addr.Port), opt); err == nil {
		t.Fatal("Expected error, got none")
	}
	close(ch)
	checkErrChannel(t, errCh)
}

func TestLookupHostResultIsRandomized(t *testing.T) {
	orgAddrs, err := net.LookupHost("localhost")
	if err != nil {
		t.Fatalf("Error looking up host: %v", err)
	}

	// We actually want the IPv4 and IPv6 addresses, so lets make sure.
	if !reflect.DeepEqual(orgAddrs, []string{"::1", "127.0.0.1"}) {
		t.Skip("Was looking for IPv4 and IPv6 addresses for localhost to perform test")
	}

	opts := natsserver.DefaultTestOptions
	opts.Host = "127.0.0.1"
	opts.Port = TEST_PORT
	s1 := RunServerWithOptions(&opts)
	defer s1.Shutdown()

	opts.Host = "::1"
	s2 := RunServerWithOptions(&opts)
	defer s2.Shutdown()

	for i := 0; i < 100; i++ {
		nc, err := Connect(fmt.Sprintf("localhost:%d", TEST_PORT))
		if err != nil {
			t.Fatalf("Error on connect: %v", err)
		}
		defer nc.Close()
	}

	if ncls := s1.NumClients(); ncls < 35 || ncls > 65 {
		t.Fatalf("Does not seem balanced between multiple servers: s1:%d, s2:%d", s1.NumClients(), s2.NumClients())
	}
}

func TestLookupHostResultIsNotRandomizedWithNoRandom(t *testing.T) {
	orgAddrs, err := net.LookupHost("localhost")
	if err != nil {
		t.Fatalf("Error looking up host: %v", err)
	}

	// We actually want the IPv4 and IPv6 addresses, so lets make sure.
	if !reflect.DeepEqual(orgAddrs, []string{"::1", "127.0.0.1"}) {
		t.Skip("Was looking for IPv4 and IPv6 addresses for localhost to perform test")
	}

	opts := natsserver.DefaultTestOptions
	opts.Host = orgAddrs[0]
	opts.Port = TEST_PORT
	s1 := RunServerWithOptions(&opts)
	defer s1.Shutdown()

	opts.Host = orgAddrs[1]
	s2 := RunServerWithOptions(&opts)
	defer s2.Shutdown()

	for i := 0; i < 100; i++ {
		nc, err := Connect(fmt.Sprintf("localhost:%d", TEST_PORT), DontRandomize())
		if err != nil {
			t.Fatalf("Error on connect: %v", err)
		}
		defer nc.Close()
	}

	if ncls := s1.NumClients(); ncls != 100 {
		t.Fatalf("Expected all clients on first server, only got %d of 100", ncls)
	}
}

func TestConnectedAddr(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	var nc *Conn
	if addr := nc.ConnectedAddr(); addr != _EMPTY_ {
		t.Fatalf("Expected empty result for nil connection, got %q", addr)
	}
	nc, err := Connect(fmt.Sprintf("localhost:%d", TEST_PORT))
	if err != nil {
		t.Fatalf("Error connecting: %v", err)
	}
	expected := s.Addr().String()
	if addr := nc.ConnectedAddr(); addr != expected {
		t.Fatalf("Expected address %q, got %q", expected, addr)
	}
	nc.Close()
	if addr := nc.ConnectedAddr(); addr != _EMPTY_ {
		t.Fatalf("Expected empty result for closed connection, got %q", addr)
	}
}

func TestSubscribeSyncRace(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("127.0.0.1:%d", TEST_PORT))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	go func() {
		time.Sleep(time.Millisecond)
		nc.Close()
	}()

	subj := "foo.sync.race"
	for i := 0; i < 10000; i++ {
		if _, err := nc.SubscribeSync(subj); err != nil {
			break
		}
		if _, err := nc.QueueSubscribeSync(subj, "gc"); err != nil {
			break
		}
	}
}

func TestBadSubjectsAndQueueNames(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("127.0.0.1:%d", TEST_PORT))
	if err != nil {
		t.Fatalf("Error connecting: %v", err)
	}
	defer nc.Close()

	// Make sure we get errors on bad subjects (spaces, etc)
	// We want the client to protect the user.
	badSubs := []string{"foo bar", "foo..bar", ".foo", "bar.baz.", "baz\t.foo"}
	for _, subj := range badSubs {
		if _, err := nc.SubscribeSync(subj); err != ErrBadSubject {
			t.Fatalf("Expected an error of ErrBadSubject for %q, got %v", subj, err)
		}
	}

	badQueues := []string{"foo group", "group\t1", "g1\r\n2"}
	for _, q := range badQueues {
		if _, err := nc.QueueSubscribeSync("foo", q); err != ErrBadQueueName {
			t.Fatalf("Expected an error of ErrBadQueueName for %q, got %v", q, err)
		}
	}
}

func BenchmarkNextMsgNoTimeout(b *testing.B) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	ncp, err := Connect(fmt.Sprintf("127.0.0.1:%d", TEST_PORT))
	if err != nil {
		b.Fatalf("Error connecting: %v", err)
	}
	ncs, err := Connect(fmt.Sprintf("127.0.0.1:%d", TEST_PORT), SyncQueueLen(b.N))
	if err != nil {
		b.Fatalf("Error connecting: %v", err)
	}

	// Test processing speed so no long subject or payloads.
	subj := "a"

	sub, err := ncs.SubscribeSync(subj)
	if err != nil {
		b.Fatalf("Error subscribing: %v", err)
	}
	ncs.Flush()

	// Set it up so we can internally queue all the messages.
	sub.SetPendingLimits(b.N, b.N*1000)

	for i := 0; i < b.N; i++ {
		ncp.Publish(subj, nil)
	}
	ncp.Flush()

	// Wait for them to all be queued up, testing NextMsg not server here.
	// Only wait at most one second.
	wait := time.Now().Add(time.Second)
	for time.Now().Before(wait) {
		nm, _, err := sub.Pending()
		if err != nil {
			b.Fatalf("Error on Pending() - %v", err)
		}
		if nm >= b.N {
			break
		}
		time.Sleep(10 * time.Millisecond)
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		if _, err := sub.NextMsg(10 * time.Millisecond); err != nil {
			b.Fatalf("Error getting message[%d]: %v", i, err)
		}
	}
}

func TestAuthErrorOnReconnect(t *testing.T) {
	// This is a bit of an artificial test, but it is to demonstrate
	// that if the client is disconnected from a server (not due to an auth error),
	// it will still correctly stop the reconnection logic if it gets twice an
	// auth error from the same server.

	o1 := natsserver.DefaultTestOptions
	o1.Port = -1
	s1 := RunServerWithOptions(&o1)
	defer s1.Shutdown()

	o2 := natsserver.DefaultTestOptions
	o2.Port = -1
	o2.Username = "ivan"
	o2.Password = "pwd"
	s2 := RunServerWithOptions(&o2)
	defer s2.Shutdown()

	dch := make(chan bool)
	cch := make(chan bool)

	urls := fmt.Sprintf("nats://%s:%d, nats://%s:%d", o1.Host, o1.Port, o2.Host, o2.Port)
	nc, err := Connect(urls,
		ReconnectWait(25*time.Millisecond),
		ReconnectJitter(0, 0),
		MaxReconnects(-1),
		DontRandomize(),
		ErrorHandler(func(_ *Conn, _ *Subscription, _ error) {}),
		DisconnectErrHandler(func(_ *Conn, e error) {
			dch <- true
		}),
		ClosedHandler(func(_ *Conn) {
			cch <- true
		}))
	if err != nil {
		t.Fatalf("Expected to connect, got err: %v\n", err)
	}
	defer nc.Close()

	s1.Shutdown()

	// wait for disconnect
	if e := WaitTime(dch, 5*time.Second); e != nil {
		t.Fatal("Did not receive a disconnect callback message")
	}

	// Wait for ClosedCB
	if e := WaitTime(cch, 5*time.Second); e != nil {
		reconnects := nc.Stats().Reconnects
		t.Fatalf("Did not receive a closed callback message, #reconnects: %v", reconnects)
	}

	// We should have stopped after 2 reconnects.
	if reconnects := nc.Stats().Reconnects; reconnects != 2 {
		t.Fatalf("Expected 2 reconnects, got %v", reconnects)
	}

	// Expect connection to be closed...
	if !nc.IsClosed() {
		t.Fatalf("Wrong status: %d\n", nc.Status())
	}
}

func TestStatsRace(t *testing.T) {
	o := natsserver.DefaultTestOptions
	o.Port = -1
	s := RunServerWithOptions(&o)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("nats://%s:%d", o.Host, o.Port))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	wg := sync.WaitGroup{}
	wg.Add(1)
	ch := make(chan bool)
	go func() {
		defer wg.Done()
		for {
			select {
			case <-ch:
				return
			default:
				nc.Stats()
			}
		}
	}()

	nc.Subscribe("foo", func(_ *Msg) {})
	for i := 0; i < 1000; i++ {
		nc.Publish("foo", []byte("hello"))
	}

	close(ch)
	wg.Wait()
}

func TestRequestLeaksMapEntries(t *testing.T) {
	o := natsserver.DefaultTestOptions
	o.Port = -1
	s := RunServerWithOptions(&o)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("nats://%s:%d", o.Host, o.Port))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	response := []byte("I will help you")
	nc.Subscribe("foo", func(m *Msg) {
		nc.Publish(m.Reply, response)
	})

	for i := 0; i < 100; i++ {
		msg, err := nc.Request("foo", nil, 500*time.Millisecond)
		if err != nil {
			t.Fatalf("Received an error on Request test: %s", err)
		}
		if !bytes.Equal(msg.Data, response) {
			t.Fatalf("Received invalid response")
		}
	}
	nc.mu.Lock()
	num := len(nc.respMap)
	nc.mu.Unlock()
	if num != 0 {
		t.Fatalf("Expected 0 entries in response map, got %d", num)
	}
}

func TestRequestMultipleReplies(t *testing.T) {
	o := natsserver.DefaultTestOptions
	o.Port = -1
	s := RunServerWithOptions(&o)
	defer s.Shutdown()

	nc, err := Connect(fmt.Sprintf("nats://%s:%d", o.Host, o.Port))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	response := []byte("I will help you")
	nc.Subscribe("foo", func(m *Msg) {
		m.Respond(response)
		m.Respond(response)
	})
	nc.Flush()

	nc2, err := Connect(fmt.Sprintf("nats://%s:%d", o.Host, o.Port))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc2.Close()

	errCh := make(chan error, 1)
	// Send a request on bar and expect nothing
	go func() {
		if m, err := nc2.Request("bar", nil, 500*time.Millisecond); m != nil || err == nil {
			errCh <- fmt.Errorf("Expected no reply, got m=%+v err=%v", m, err)
			return
		}
		errCh <- nil
	}()

	// Send a request on foo, we use only one of the 2 replies
	if _, err := nc2.Request("foo", nil, time.Second); err != nil {
		t.Fatalf("Received an error on Request test: %s", err)
	}
	if e := <-errCh; e != nil {
		t.Fatal(e.Error())
	}
}

func TestRequestInit(t *testing.T) {
	o := natsserver.DefaultTestOptions
	o.Port = -1
	s := RunServerWithOptions(&o)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL())
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	defer nc.Close()

	if _, err := nc.Subscribe("foo", func(m *Msg) {
		m.Respond([]byte("reply"))
	}); err != nil {
		t.Fatalf("Error on subscribe: %v", err)
	}

	// Artificially change the status to something that would make the internal subscribe
	// call fail. Don't use CLOSED because then there is a risk that the flusher() goes away
	// and so the rest of the test would fail.
	nc.mu.Lock()
	orgStatus := nc.status
	nc.status = DRAINING_SUBS
	nc.mu.Unlock()

	if _, err := nc.Request("foo", []byte("request"), 50*time.Millisecond); err == nil {
		t.Fatal("Expected error, got none")
	}

	nc.mu.Lock()
	nc.status = orgStatus
	nc.mu.Unlock()

	if _, err := nc.Request("foo", []byte("request"), 500*time.Millisecond); err != nil {
		t.Fatalf("Error on request: %v", err)
	}
}

func TestGetRTT(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL(), ReconnectWait(10*time.Millisecond), ReconnectJitter(0, 0))
	if err != nil {
		t.Fatalf("Expected to connect to server, got %v", err)
	}
	defer nc.Close()

	rtt, err := nc.RTT()
	if err != nil {
		t.Fatalf("Unexpected error getting RTT: %v", err)
	}
	if rtt > time.Second {
		t.Fatalf("RTT value too large: %v", rtt)
	}
	// We should not get a value when in any disconnected state.
	s.Shutdown()
	time.Sleep(5 * time.Millisecond)
	if _, err = nc.RTT(); err != ErrDisconnected {
		t.Fatalf("Expected disconnected error getting RTT when disconnected, got %v", err)
	}
}

func TestGetClientIP(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL())
	if err != nil {
		t.Fatalf("Expected to connect to server, got %v", err)
	}
	defer nc.Close()

	ip, err := nc.GetClientIP()
	if err != nil {
		t.Fatalf("Got error looking up IP: %v", err)
	}
	if !ip.IsLoopback() {
		t.Fatalf("Expected a loopback IP, got %v", ip)
	}
	nc.Close()
	if _, err := nc.GetClientIP(); err != ErrConnectionClosed {
		t.Fatalf("Expected a connection closed error, got %v", err)
	}
}

func TestNoPanicOnSrvPoolSizeChanging(t *testing.T) {
	listeners := []net.Listener{}
	ports := []int{}

	for i := 0; i < 3; i++ {
		l, err := net.Listen("tcp", "127.0.0.1:0")
		if err != nil {
			t.Fatalf("Could not listen on an ephemeral port: %v", err)
		}
		defer l.Close()
		tl := l.(*net.TCPListener)
		ports = append(ports, tl.Addr().(*net.TCPAddr).Port)
		listeners = append(listeners, l)
	}

	wg := sync.WaitGroup{}
	wg.Add(len(listeners))

	connect := int32(0)
	srv := func(l net.Listener) {
		defer wg.Done()
		for {
			conn, err := l.Accept()
			if err != nil {
				return
			}
			defer conn.Close()

			var info string

			reject := atomic.AddInt32(&connect, 1) <= 2
			if reject {
				// Sends a list of 3 servers, where the second does not actually run.
				// This server is going to reject the connect (with auth error), so
				// client will move to 2nd, fail, then go to third...
				info = fmt.Sprintf("INFO {\"server_id\":\"foobar\",\"connect_urls\":[\"127.0.0.1:%d\",\"127.0.0.1:%d\",\"127.0.0.1:%d\"]}\r\n",
					ports[0], ports[1], ports[2])
			} else {
				// This third server will return the INFO with only the original server
				// and the third one, which will make the srvPool size shrink down to 2.
				info = fmt.Sprintf("INFO {\"server_id\":\"foobar\",\"connect_urls\":[\"127.0.0.1:%d\",\"127.0.0.1:%d\"]}\r\n",
					ports[0], ports[2])
			}
			conn.Write([]byte(info))

			// Read connect and ping commands sent from the client
			br := bufio.NewReaderSize(conn, 10*1024)
			br.ReadLine()
			br.ReadLine()

			if reject {
				conn.Write([]byte(fmt.Sprintf("-ERR '%s'\r\n", AUTHORIZATION_ERR)))
				conn.Close()
			} else {
				conn.Write([]byte(pongProto))
				br.ReadLine()
			}
		}
	}

	for _, l := range listeners {
		go srv(l)
	}

	time.Sleep(250 * time.Millisecond)

	nc, err := Connect(fmt.Sprintf("nats://127.0.0.1:%d", ports[0]))
	if err != nil {
		t.Fatalf("Error on connect: %v", err)
	}
	nc.Close()
	for _, l := range listeners {
		l.Close()
	}
	wg.Wait()
}

func TestReconnectWaitJitter(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	rch := make(chan time.Time, 1)
	nc, err := Connect(s.ClientURL(),
		ReconnectWait(100*time.Millisecond),
		ReconnectJitter(500*time.Millisecond, 0),
		ReconnectHandler(func(_ *Conn) {
			rch <- time.Now()
		}),
	)
	if err != nil {
		t.Fatalf("Error during connect: %v", err)
	}
	defer nc.Close()

	s.Shutdown()
	start := time.Now()
	// Wait a bit so that the library tries a first time without waiting.
	time.Sleep(50 * time.Millisecond)
	s = RunServerOnPort(TEST_PORT)
	defer s.Shutdown()
	select {
	case end := <-rch:
		dur := end.Sub(start)
		// We should wait at least the reconnect wait + random up to 500ms.
		// Account for a bit of variation since we rely on the reconnect
		// handler which is not invoked in place.
		if dur < 90*time.Millisecond || dur > 800*time.Millisecond {
			t.Fatalf("Wrong wait: %v", dur)
		}
	case <-time.After(5 * time.Second):
		t.Fatalf("Should have reconnected")
	}
	nc.Close()

	// Use a long reconnect wait
	nc, err = Connect(s.ClientURL(), ReconnectWait(10*time.Minute))
	if err != nil {
		t.Fatalf("Error during connect: %v", err)
	}
	defer nc.Close()

	// Cause a disconnect
	s.Shutdown()
	// Wait a bit for the reconnect loop to go into wait mode.
	time.Sleep(50 * time.Millisecond)
	s = RunServerOnPort(TEST_PORT)
	defer s.Shutdown()
	// Now close and expect the reconnect go routine to return..
	nc.Close()
	// Wait a bit to give a chance for the go routine to exit.
	time.Sleep(50 * time.Millisecond)
	buf := make([]byte, 100000)
	n := runtime.Stack(buf, true)
	if strings.Contains(string(buf[:n]), "doReconnect") {
		t.Fatalf("doReconnect go routine still running:\n%s", buf[:n])
	}
}

func TestCustomReconnectDelay(t *testing.T) {
	s := RunServerOnPort(TEST_PORT)
	defer s.Shutdown()

	expectedAttempt := 1
	errCh := make(chan error, 1)
	cCh := make(chan bool, 1)
	nc, err := Connect(s.ClientURL(),
		Timeout(100*time.Millisecond), // Need to lower for Windows tests
		CustomReconnectDelay(func(n int) time.Duration {
			var err error
			var delay time.Duration
			if n != expectedAttempt {
				err = fmt.Errorf("Expected attempt to be %v, got %v", expectedAttempt, n)
			} else {
				expectedAttempt++
				if n <= 4 {
					delay = 100 * time.Millisecond
				}
			}
			if err != nil {
				select {
				case errCh <- err:
				default:
				}
			}
			return delay
		}),
		MaxReconnects(4),
		ClosedHandler(func(_ *Conn) {
			cCh <- true
		}),
	)
	if err != nil {
		t.Fatalf("Error during connect: %v", err)
	}
	defer nc.Close()

	// Cause disconnect
	s.Shutdown()

	// We should be trying to reconnect 4 times
	start := time.Now()

	// Wait on error or completion of test.
	select {
	case e := <-errCh:
		if e != nil {
			t.Fatal(e.Error())
		}
	case <-cCh:
	case <-time.After(2 * time.Second):
		t.Fatalf("No CB invoked")
	}
	// On Windows, a failed connect attempt will last as much as Timeout(),
	// so we need to take that into account.
	max := 500 * time.Millisecond
	if runtime.GOOS == "windows" {
		max = time.Second
	}
	if dur := time.Since(start); dur >= max {
		t.Fatalf("Waited too long on each reconnect: %v", dur)
	}
}

func TestHeaderParser(t *testing.T) {
	shouldErr := func(hdr string) {
		t.Helper()
		if _, err := DecodeHeadersMsg([]byte(hdr)); err == nil {
			t.Fatalf("Expected an error")
		}
	}
	shouldErr("NATS/1.0")
	shouldErr("NATS/1.0\r\n")
	shouldErr("NATS/1.0\r\nk1:v1")
	shouldErr("NATS/1.0\r\nk1:v1\r\n")

	// Check that we can do inline status and descriptions
	checkStatus := func(hdr string, status int, description string) {
		t.Helper()
		hdrs, err := DecodeHeadersMsg([]byte(hdr + "\r\n\r\n"))
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		if code, err := strconv.Atoi(hdrs.Get(statusHdr)); err != nil || code != status {
			t.Fatalf("Expected status of %d, got %s", status, hdrs.Get(statusHdr))
		}
		if len(description) > 0 {
			if descr := hdrs.Get(descrHdr); err != nil || descr != description {
				t.Fatalf("Expected description of %q, got %q", description, descr)
			}
		}
	}

	checkStatus("NATS/1.0 503", 503, "")
	checkStatus("NATS/1.0 503 No Responders", 503, "No Responders")
	checkStatus("NATS/1.0  404   No Messages", 404, "No Messages")
}

func TestHeaderMultiLine(t *testing.T) {
	m := NewMsg("foo")
	m.Header = Header{
		"CorrelationID": []string{"123"},
		"Msg-ID":        []string{"456"},
		"X-NATS-Keys":   []string{"A", "B", "C"},
		"X-Test-Keys":   []string{"D", "E", "F"},
	}
	// Users can opt-in to canonicalize like http.Header does
	// by using http.Header#Set or http.Header#Add.
	http.Header(m.Header).Set("accept-encoding", "json")
	http.Header(m.Header).Add("AUTHORIZATION", "s3cr3t")

	// Multi Value Header becomes represented as multi-lines in the wire
	// since internally using same Write from http stdlib.
	m.Header.Set("X-Test", "First")
	m.Header.Add("X-Test", "Second")
	m.Header.Add("X-Test", "Third")

	b, err := m.headerBytes()
	if err != nil {
		t.Fatal(err)
	}
	result := string(b)

	expectedHeader := `NATS/1.0
Accept-Encoding: json
Authorization: s3cr3t
CorrelationID: 123
Msg-ID: 456
X-NATS-Keys: A
X-NATS-Keys: B
X-NATS-Keys: C
X-Test: First
X-Test: Second
X-Test: Third
X-Test-Keys: D
X-Test-Keys: E
X-Test-Keys: F

`
	if strings.Replace(expectedHeader, "\n", "\r\n", -1) != result {
		t.Fatalf("Expected: %q, got: %q", expectedHeader, result)
	}
}

func TestLameDuckMode(t *testing.T) {
	l, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("Could not listen on an ephemeral port: %v", err)
	}
	tl := l.(*net.TCPListener)
	defer tl.Close()

	addr := tl.Addr().(*net.TCPAddr)

	wg := sync.WaitGroup{}
	wg.Add(1)
	go func() {
		defer wg.Done()
		ldmInfos := []string{"INFO {\"ldm\":true}\r\n", "INFO {\"connect_urls\":[\"127.0.0.1:1234\"],\"ldm\":true}\r\n"}
		for _, ldmInfo := range ldmInfos {
			conn, err := l.Accept()
			if err != nil {
				return
			}
			defer conn.Close()

			info := "INFO {\"server_id\":\"foobar\"}\r\n"
			conn.Write([]byte(info))

			// Read connect and ping commands sent from the client
			br := bufio.NewReaderSize(conn, 10*1024)
			br.ReadLine()
			br.ReadLine()
			conn.Write([]byte(pongProto))

			// Wait a bit and then send a INFO with LDM
			time.Sleep(100 * time.Millisecond)
			conn.Write([]byte(ldmInfo))
			br.ReadLine()
			conn.Close()
		}
	}()

	url := fmt.Sprintf("nats://127.0.0.1:%d", addr.Port)
	time.Sleep(100 * time.Millisecond)

	for _, test := range []struct {
		name  string
		curls bool
	}{
		{"without connect urls", false},
		{"with connect urls", true},
	} {
		t.Run(test.name, func(t *testing.T) {
			ch := make(chan bool, 1)
			errCh := make(chan error, 1)
			nc, err := Connect(url,
				DiscoveredServersHandler(func(nc *Conn) {
					ds := nc.DiscoveredServers()
					if !reflect.DeepEqual(ds, []string{"nats://127.0.0.1:1234"}) {
						errCh <- fmt.Errorf("wrong discovered servers: %q", ds)
					} else {
						errCh <- nil
					}
				}),
				LameDuckModeHandler(func(_ *Conn) {
					ch <- true
				}),
			)
			if err != nil {
				t.Fatalf("Expected to connect, got %v", err)
			}
			defer nc.Close()

			select {
			case <-ch:
			case <-time.After(2 * time.Second):
				t.Fatal("should have been notified of LDM")
			}
			select {
			case e := <-errCh:
				if !test.curls {
					t.Fatal("should not have received connect urls")
				} else if e != nil {
					t.Fatal(e.Error())
				}
			default:
				if test.curls {
					t.Fatal("should have received notification about discovered servers")
				}
			}

			nc.Close()
		})
	}
	wg.Wait()
}

func TestMsg_RespondMsg(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL())
	if err != nil {
		t.Fatalf("Expected to connect to server, got %v", err)
	}
	defer nc.Close()

	sub, err := nc.SubscribeSync(NewInbox())
	if err != nil {
		t.Fatalf("subscribe failed: %s", err)
	}

	nc.PublishMsg(&Msg{Reply: sub.Subject, Subject: sub.Subject, Data: []byte("request")})
	req, err := sub.NextMsg(time.Second)
	if err != nil {
		t.Fatalf("NextMsg failed: %s", err)
	}

	// verifies that RespondMsg sets the reply subject on msg based on req
	err = req.RespondMsg(&Msg{Data: []byte("response")})
	if err != nil {
		t.Fatalf("RespondMsg failed: %s", err)
	}

	resp, err := sub.NextMsg(time.Second)
	if err != nil {
		t.Fatalf("NextMsg failed: %s", err)
	}

	if !bytes.Equal(resp.Data, []byte("response")) {
		t.Fatalf("did not get correct response: %q", resp.Data)
	}
}

func TestCustomInboxPrefix(t *testing.T) {
	opts := &Options{}
	for _, p := range []string{"$BOB.", "$BOB.*", "$BOB.>", ">", ".", "", "BOB.*.X", "BOB.>.X"} {
		err := CustomInboxPrefix(p)(opts)
		if err == nil {
			t.Fatalf("Expeted error for %q", p)
		}
	}

	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL(), CustomInboxPrefix("$BOB"))
	if err != nil {
		t.Fatalf("Expected to connect to server, got %v", err)
	}
	defer nc.Close()

	sub, err := nc.Subscribe(NewInbox(), func(msg *Msg) {
		if !strings.HasPrefix(msg.Reply, "$BOB.") {
			t.Fatalf("invalid inbox subject %q received", msg.Reply)
		}

		if len(strings.Split(msg.Reply, ".")) != 3 {
			t.Fatalf("invalid number tokens in %s", msg.Reply)
		}

		msg.Respond([]byte("ok"))
	})
	if err != nil {
		t.Fatalf("subscribe failed: %s", err)
	}

	resp, err := nc.Request(sub.Subject, nil, time.Second)
	if err != nil {
		t.Fatalf("request failed: %s", err)
	}

	if !bytes.Equal(resp.Data, []byte("ok")) {
		t.Fatalf("did not receive ok: %q", resp.Data)
	}
}

func TestRespInbox(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect(s.ClientURL())
	if err != nil {
		t.Fatalf("Expected to connect to server, got %v", err)
	}
	defer nc.Close()

	if _, err := nc.Subscribe("foo", func(msg *Msg) {
		lastDot := strings.LastIndex(msg.Reply, ".")
		if lastDot == -1 {
			msg.Respond([]byte(fmt.Sprintf("Invalid reply subject: %q", msg.Reply)))
			return
		}
		lastToken := msg.Reply[lastDot+1:]
		if len(lastToken) != replySuffixLen {
			msg.Respond([]byte(fmt.Sprintf("Invalid last token: %q", lastToken)))
			return
		}
		msg.Respond(nil)
	}); err != nil {
		t.Fatalf("subscribe failed: %s", err)
	}
	resp, err := nc.Request("foo", []byte("check inbox"), time.Second)
	if err != nil {
		t.Fatalf("Request failed: %v", err)
	}
	if len(resp.Data) > 0 {
		t.Fatalf("Error: %s", resp.Data)
	}
}

func TestInProcessConn(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	nc, err := Connect("", InProcessServer(s))
	if err != nil {
		t.Fatal(err)
	}

	defer nc.Close()

	// Status should be connected.
	if nc.Status() != CONNECTED {
		t.Fatal("should be status CONNECTED")
	}

	// The server should respond to a request.
	if _, err := nc.RTT(); err != nil {
		t.Fatal(err)
	}
}

func TestServerListWithTrailingComma(t *testing.T) {
	s := RunServerOnPort(-1)
	defer s.Shutdown()

	// Notice the comma at the end of the "list"
	nc, err := Connect(fmt.Sprintf("%s,", s.ClientURL()))
	if err != nil {
		t.Fatalf("Unable to connect: %v", err)
	}
	defer nc.Close()

	// Now check server pool
	nc.mu.Lock()
	l := len(nc.srvPool)
	nc.mu.Unlock()
	if l != 1 {
		t.Fatalf("There should be only 1 URL in the list, got %v", l)
	}
}

func BenchmarkHeaderDecode(b *testing.B) {
	benchmarks := []struct {
		name   string
		header Header
	}{
		{"Small - 25", Header{
			"Msg-ID": []string{"123"}},
		},
		{"Medium - 141", Header{
			"CorrelationID": []string{"123"},
			"Msg-ID":        []string{"456"},
			"X-NATS-Keys":   []string{"A", "B", "C"},
			"X-Test-Keys":   []string{"D", "E", "F"},
		}},
		{"Large - 368", Header{
			"CorrelationID":     []string{"123"},
			"Msg-ID":            []string{"456"},
			"X-NATS-Keys":       []string{"A", "B", "C"},
			"X-Test-Keys":       []string{"D", "E", "F"},
			"X-A-Long-Header-1": []string{strings.Repeat("A", 100)},
			"X-A-Long-Header-2": []string{strings.Repeat("A", 100)},
		}},
	}
	for _, bm := range benchmarks {
		b.Run(bm.name, func(b *testing.B) {
			b.ReportAllocs()

			m := NewMsg("foo")
			m.Header = bm.header
			hdr, err := m.headerBytes()
			if err != nil {
				b.Fatalf("Unexpected error: %v", err)
			}

			for i := 0; i < b.N; i++ {
				if _, err := DecodeHeadersMsg(hdr); err != nil {
					b.Fatalf("Unexpected error: %v", err)
				}
			}
		})
	}
}