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cluster_test.go
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cluster_test.go
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package nats
import (
"math"
"reflect"
"regexp"
"sync"
"testing"
"time"
)
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 TestServersRandomize(t *testing.T) {
opts := DefaultOptions
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 = DefaultOptions
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")
}
}
func TestServersOption(t *testing.T) {
opts := DefaultOptions
opts.NoRandomize = true
_, err := opts.Connect()
if err != ErrNoServers {
t.Fatalf("Wrong error: '%s'\n", err)
}
opts.Servers = testServers
_, err = opts.Connect()
if err == nil || err != ErrNoServers {
t.Fatalf("Did not receive proper error: %v\n", err)
}
// Make sure we can connect to first server if running
s1 := startServer(t, 1222, "")
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Could not connect: %v\n", err)
}
if nc.ConnectedUrl() != "nats://localhost:1222" {
t.Fatalf("Does not report correct connection: %s\n",
nc.ConnectedUrl())
}
nc.Close()
s1.stopServer()
// Make sure we can connect to a non first server if running
s2 := startServer(t, 1223, "")
nc, err = opts.Connect()
if err != nil {
t.Fatalf("Could not connect: %v\n", err)
}
if nc.ConnectedUrl() != "nats://localhost:1223" {
t.Fatalf("Does not report correct connection: %s\n",
nc.ConnectedUrl())
}
nc.Close()
s2.stopServer()
}
func TestAuthServers(t *testing.T) {
var plainServers = []string{
"nats://localhost:1222",
"nats://localhost:1224",
}
as1 := startServer(t, 1222, "--user derek --pass foo")
defer as1.stopServer()
as2 := startServer(t, 1224, "--user derek --pass foo")
defer as2.stopServer()
opts := DefaultOptions
opts.NoRandomize = true
opts.Servers = plainServers
_, err := opts.Connect()
if err == nil {
t.Fatalf("Expect Auth failure, got no error\n")
}
if matched, _ := regexp.Match(`Authorization`, []byte(err.Error())); !matched {
t.Fatalf("Wrong error, wanted Auth failure, got '%s'\n", err)
}
// Test that we can connect to a subsequent correct server.
var authServers = []string{
"nats://localhost:1222",
"nats://derek:foo@localhost:1224",
}
opts.Servers = authServers
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect properly: %v\n", err)
}
if nc.ConnectedUrl() != authServers[1] {
t.Fatalf("Does not report correct connection: %s\n",
nc.ConnectedUrl())
}
}
func TestSelectNextServer(t *testing.T) {
opts := DefaultOptions
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.url != nc.srvPool[0].url {
t.Fatalf("Wrong default selection: %v\n", nc.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.url.String() != testServers[1] {
t.Fatalf("Selection incorrect: %v vs %v\n", nc.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.url.String() != testServers[2] {
t.Fatalf("Selection incorrect: %v vs %v\n", nc.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")
}
}
func TestBasicClusterReconnect(t *testing.T) {
s1 := startServer(t, 1222, "")
s2 := startServer(t, 1224, "")
defer s2.stopServer()
opts := DefaultOptions
opts.Servers = testServers
opts.NoRandomize = true
dch := make(chan bool)
opts.DisconnectedCB = func(_ *Conn) {
dch <- true
}
rch := make(chan bool)
opts.ReconnectedCB = func(_ *Conn) {
rch <- true
}
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
s1.stopServer()
// wait for disconnect
if e := waitTime(dch, 2*time.Second); e != nil {
t.Fatal("Did not receive a disconnect callback message")
}
reconnectTimeStart := time.Now()
// wait for reconnect
if e := waitTime(rch, 2*time.Second); e != nil {
t.Fatal("Did not receive a reconnect callback message")
}
if nc.ConnectedUrl() != testServers[2] {
t.Fatalf("Does not report correct connection: %s\n",
nc.ConnectedUrl())
}
// Make sure we did not wait on reconnect for default time.
// Reconnect should be fast since it will be a switch to the
// second server and not be dependent on server restart time.
reconnectTime := time.Since(reconnectTimeStart)
if reconnectTime > (100 * time.Millisecond) {
t.Fatalf("Took longer than expected to reconnect: %v\n", reconnectTime)
}
}
func TestHotSpotReconnect(t *testing.T) {
s1 := startServer(t, 1222, "")
numClients := 100
clients := []*Conn{}
wg := &sync.WaitGroup{}
wg.Add(numClients)
for i := 0; i < numClients; i++ {
opts := DefaultOptions
opts.Servers = testServers
opts.ReconnectedCB = func(_ *Conn) {
wg.Done()
}
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
if nc.ConnectedUrl() != testServers[0] {
t.Fatalf("Connected to incorrect server: %v\n", nc.ConnectedUrl())
}
clients = append(clients, nc)
}
s2 := startServer(t, 1224, "")
defer s2.stopServer()
s3 := startServer(t, 1226, "")
defer s3.stopServer()
s1.stopServer()
numServers := 2
// Wait on all reconnects
wg.Wait()
// Walk the clients and calculate how many of each..
cs := make(map[string]int)
for _, nc := range clients {
cs[nc.ConnectedUrl()] += 1
nc.Close()
}
if len(cs) != numServers {
t.Fatalf("Wrong number or reported servers: %d vs %d\n", len(cs), numServers)
}
expected := numClients / numServers
v := uint(float32(expected) * 0.30)
// Check that each item is within acceptable range
for s, total := range cs {
delta := uint(math.Abs(float64(expected - total)))
if delta > v {
t.Fatalf("Connected clients to server: %s out of range: %d\n", s, total)
}
}
}
func TestProperReconnectDelay(t *testing.T) {
s1 := startServer(t, 1222, "")
opts := DefaultOptions
opts.Servers = testServers
opts.NoRandomize = true
dcbCalled := false
dch := make(chan bool)
opts.DisconnectedCB = func(_ *Conn) {
dcbCalled = true
dch <- true
}
closedCbCalled := false
opts.ClosedCB = func(_ *Conn) {
closedCbCalled = true
}
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
s1.stopServer()
// wait for disconnect
if e := waitTime(dch, 2*time.Second); e != nil {
t.Fatal("Did not receive a disconnect callback message")
}
// Wait, want to make sure we don't spin on reconnect to non-existant servers.
time.Sleep(1 * time.Second)
// Make sure we are still reconnecting..
if closedCbCalled {
t.Fatal("Closed CB was triggered, should not have been.")
}
if nc.status != RECONNECTING {
t.Fatalf("Wrong status: %d\n", nc.status)
}
}
func TestProperFalloutAfterMaxAttempts(t *testing.T) {
s1 := startServer(t, 1222, "")
opts := DefaultOptions
opts.Servers = testServers
opts.NoRandomize = true
opts.MaxReconnect = 5
opts.ReconnectWait = (10 * time.Millisecond)
dcbCalled := false
dch := make(chan bool)
opts.DisconnectedCB = func(_ *Conn) {
dcbCalled = true
dch <- true
}
closedCbCalled := false
cch := make(chan bool)
opts.ClosedCB = func(_ *Conn) {
closedCbCalled = true
cch <- true
}
nc, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
s1.stopServer()
// wait for disconnect
if e := waitTime(dch, 2*time.Second); e != nil {
t.Fatal("Did not receive a disconnect callback message")
}
// Wait for ClosedCB
if e := waitTime(cch, 1*time.Second); e != nil {
t.Fatal("Did not receive a closed callback message")
}
// Make sure we are still reconnecting..
if !closedCbCalled {
t.Logf("%+v\n", nc)
t.Fatal("Closed CB was not triggered, should have been.")
}
if nc.IsClosed() != true {
t.Fatalf("Wrong status: %d\n", nc.status)
}
}
func TestTimeoutOnNoServers(t *testing.T) {
s1 := startServer(t, 1222, "")
opts := DefaultOptions
opts.Servers = testServers
opts.NoRandomize = true
// 100 milliseconds total time wait
opts.MaxReconnect = 10
opts.ReconnectWait = (10 * time.Millisecond)
dcbCalled := false
dch := make(chan bool)
opts.DisconnectedCB = func(_ *Conn) {
dcbCalled = true
dch <- true
}
cch := make(chan bool)
opts.ClosedCB = func(_ *Conn) {
cch <- true
}
if _, err := opts.Connect(); err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
s1.stopServer()
// wait for disconnect
if e := waitTime(dch, 2*time.Second); e != nil {
t.Fatal("Did not receive a disconnect callback message")
}
startWait := time.Now()
// Wait for ClosedCB
if e := waitTime(cch, 1*time.Second); e != nil {
t.Fatal("Did not receive a closed callback message")
}
timeWait := time.Since(startWait)
// Use 50ms as variable time delta
variable := (50 * time.Millisecond)
expected := (time.Duration(opts.MaxReconnect) * opts.ReconnectWait)
if timeWait > (expected + variable) {
t.Fatalf("Waited too long for Closed state: %d\n", timeWait/time.Millisecond)
}
}
func TestPingReconnect(t *testing.T) {
RECONNECTS := 4
s1 := startServer(t, 1222, "")
defer s1.stopServer()
opts := DefaultOptions
opts.Servers = testServers
opts.NoRandomize = true
opts.ReconnectWait = 200 * time.Millisecond
opts.PingInterval = 50 * time.Millisecond
opts.MaxPingsOut = -1
barrier := make(chan struct{})
rch := make(chan time.Time, RECONNECTS)
dch := make(chan time.Time, RECONNECTS)
opts.DisconnectedCB = func(_ *Conn) {
d := dch
select {
case d <- time.Now():
default:
d = nil
}
}
opts.ReconnectedCB = func(c *Conn) {
r := rch
select {
case r <- time.Now():
default:
r = nil
c.Opts.MaxPingsOut = 500
close(barrier)
}
}
_, err := opts.Connect()
if err != nil {
t.Fatalf("Expected to connect, got err: %v\n", err)
}
<-barrier
s1.stopServer()
<-dch
for i := 0; i < RECONNECTS-1; i++ {
disconnectedAt := <-dch
reconnectAt := <-rch
pingCycle := disconnectedAt.Sub(reconnectAt)
if pingCycle > 2*opts.PingInterval {
t.Fatalf("Reconnect due to ping took %s", pingCycle.String())
}
}
}