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drain_test.go
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drain_test.go
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// Copyright 2018-2020 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"fmt"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/nats-io/nats.go"
)
// Drain can be very useful for graceful shutdown of subscribers.
// Especially queue subscribers.
func TestDrain(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
nc := NewDefaultConnection(t)
defer nc.Close()
done := make(chan bool)
received := int32(0)
expected := int32(100)
cb := func(_ *nats.Msg) {
// Allow this to back up.
time.Sleep(time.Millisecond)
rcvd := atomic.AddInt32(&received, 1)
if rcvd >= expected {
done <- true
}
}
sub, err := nc.Subscribe("foo", cb)
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
for i := int32(0); i < expected; i++ {
nc.Publish("foo", []byte("Don't forget about me"))
}
// Drain it and make sure we receive all messages.
sub.Drain()
select {
case <-done:
break
case <-time.After(2 * time.Second):
r := atomic.LoadInt32(&received)
if r != expected {
t.Fatalf("Did not receive all messages: %d of %d", r, expected)
}
}
}
func TestDrainQueueSub(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
nc := NewDefaultConnection(t)
defer nc.Close()
done := make(chan bool)
received := int32(0)
expected := int32(4096)
numSubs := int32(32)
checkDone := func() int32 {
rcvd := atomic.AddInt32(&received, 1)
if rcvd >= expected {
done <- true
}
return rcvd
}
callback := func(m *nats.Msg) {
rcvd := checkDone()
// Randomly replace this sub from time to time.
if rcvd%3 == 0 {
m.Sub.Drain()
// Create a new one that we will not drain.
nc.QueueSubscribe("foo", "bar", func(m *nats.Msg) { checkDone() })
}
}
for i := int32(0); i < numSubs; i++ {
_, err := nc.QueueSubscribe("foo", "bar", callback)
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
}
for i := int32(0); i < expected; i++ {
nc.Publish("foo", []byte("Don't forget about me"))
}
select {
case <-done:
break
case <-time.After(5 * time.Second):
r := atomic.LoadInt32(&received)
if r != expected {
t.Fatalf("Did not receive all messages: %d of %d", r, expected)
}
}
}
func waitFor(t *testing.T, totalWait, sleepDur time.Duration, f func() error) {
t.Helper()
timeout := time.Now().Add(totalWait)
var err error
for time.Now().Before(timeout) {
err = f()
if err == nil {
return
}
time.Sleep(sleepDur)
}
if err != nil {
t.Fatal(err.Error())
}
}
func TestDrainUnSubs(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
nc := NewDefaultConnection(t)
defer nc.Close()
num := 100
subs := make([]*nats.Subscription, num)
// Normal Unsubscribe
for i := 0; i < num; i++ {
sub, err := nc.Subscribe("foo", func(_ *nats.Msg) {})
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
subs[i] = sub
}
if numSubs := nc.NumSubscriptions(); numSubs != num {
t.Fatalf("Expected %d subscriptions, got %d", num, numSubs)
}
for i := 0; i < num; i++ {
subs[i].Unsubscribe()
}
if numSubs := nc.NumSubscriptions(); numSubs != 0 {
t.Fatalf("Expected no subscriptions, got %d", numSubs)
}
// Drain version
for i := 0; i < num; i++ {
sub, err := nc.Subscribe("foo", func(_ *nats.Msg) {})
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
subs[i] = sub
}
if numSubs := nc.NumSubscriptions(); numSubs != num {
t.Fatalf("Expected %d subscriptions, got %d", num, numSubs)
}
for i := 0; i < num; i++ {
subs[i].Drain()
}
// Should happen quickly that we get to zero, so do not need to wait long.
waitFor(t, 2*time.Second, 10*time.Millisecond, func() error {
if numSubs := nc.NumSubscriptions(); numSubs != 0 {
return fmt.Errorf("Expected no subscriptions, got %d", numSubs)
}
return nil
})
}
func TestDrainSlowSubscriber(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
nc := NewDefaultConnection(t)
defer nc.Close()
received := int32(0)
sub, err := nc.Subscribe("foo", func(_ *nats.Msg) {
atomic.AddInt32(&received, 1)
time.Sleep(100 * time.Millisecond)
})
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
total := 10
for i := 0; i < total; i++ {
nc.Publish("foo", []byte("Slow Slow"))
}
nc.Flush()
pmsgs, _, _ := sub.Pending()
if pmsgs != total && pmsgs != total-1 {
t.Fatalf("Expected most messages to be pending, but got %d vs %d", pmsgs, total)
}
sub.Drain()
// Should take a second or so to drain away.
waitFor(t, 2*time.Second, 100*time.Millisecond, func() error {
// Wait for it to become invalid. Once drained it is unsubscribed.
_, _, err := sub.Pending()
if err != nats.ErrBadSubscription {
return fmt.Errorf("Still valid")
}
r := int(atomic.LoadInt32(&received))
if r != total {
t.Fatalf("Did not receive all messages, got %d vs %d", r, total)
}
return nil
})
}
func TestDrainConnection(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
done := make(chan bool)
rdone := make(chan bool)
closed := func(nc *nats.Conn) {
done <- true
}
url := fmt.Sprintf("nats://127.0.0.1:%d", nats.DefaultPort)
nc, err := nats.Connect(url, nats.ClosedHandler(closed))
if err != nil {
t.Fatalf("Failed to create default connection: %v", err)
}
defer nc.Close()
nc2, err := nats.Connect(url)
if err != nil {
t.Fatalf("Failed to create default connection: %v", err)
}
defer nc2.Close()
received := int32(0)
responses := int32(0)
expected := int32(50)
sleep := 10 * time.Millisecond
// Create the listner for responses on "bar"
_, err = nc2.Subscribe("bar", func(_ *nats.Msg) {
r := atomic.AddInt32(&responses, 1)
if r == expected {
rdone <- true
}
})
if err != nil {
t.Fatalf("Error creating subscription for responses: %v", err)
}
// Create a slow subscriber for the responder
sub, err := nc.Subscribe("foo", func(m *nats.Msg) {
time.Sleep(sleep)
atomic.AddInt32(&received, 1)
err := nc.Publish(m.Reply, []byte("Stop bugging me"))
if err != nil {
t.Errorf("Publisher received an error sending response: %v\n", err)
}
})
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
// Publish some messages
for i := int32(0); i < expected; i++ {
nc.PublishRequest("foo", "bar", []byte("Slow Slow"))
}
drainStart := time.Now()
nc.Drain()
// Sub should be disabled immediately
if err := sub.Unsubscribe(); err == nil {
t.Fatalf("Expected to receive an error on Unsubscribe after drain")
}
// Also can not create any new subs
if _, err := nc.Subscribe("foo", func(_ *nats.Msg) {}); err == nil {
t.Fatalf("Expected to receive an error on new Subscription after drain")
}
// Make sure we can still publish, this is for any responses.
if err := nc.Publish("baz", []byte("Slow Slow")); err != nil {
t.Fatalf("Expected to not receive an error on Publish after drain, got %v", err)
}
// Wait for the closed state from nc
select {
case <-done:
if time.Since(drainStart) < (sleep * time.Duration(expected)) {
t.Fatalf("Drain exited too soon\n")
}
r := atomic.LoadInt32(&received)
if r != expected {
t.Fatalf("Did not receive all messages from Drain, %d vs %d", r, expected)
}
break
case <-time.After(2 * time.Second):
t.Fatalf("Timeout waiting for closed state for connection")
}
// Now make sure all responses were received.
select {
case <-rdone:
r := atomic.LoadInt32(&responses)
if r != expected {
t.Fatalf("Did not receive all responses, %d vs %d", r, expected)
}
break
case <-time.After(2 * time.Second):
t.Fatalf("Timeout waiting for all the responses")
}
}
func TestDrainConnectionAutoUnsub(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
errors := int32(0)
received := int32(0)
expected := int32(10)
done := make(chan bool)
closed := func(nc *nats.Conn) {
done <- true
}
errCb := func(nc *nats.Conn, s *nats.Subscription, err error) {
atomic.AddInt32(&errors, 1)
}
url := fmt.Sprintf("nats://127.0.0.1:%d", nats.DefaultPort)
nc, err := nats.Connect(url, nats.ErrorHandler(errCb), nats.ClosedHandler(closed))
if err != nil {
t.Fatalf("Failed to create default connection: %v", err)
}
defer nc.Close()
sub, err := nc.Subscribe("foo", func(_ *nats.Msg) {
// So they back up a bit in client and allow drain to do its thing.
time.Sleep(10 * time.Millisecond)
atomic.AddInt32(&received, 1)
})
if err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
sub.AutoUnsubscribe(int(expected))
// Publish some messages
for i := 0; i < 50; i++ {
nc.Publish("foo", []byte("Only 10 please!"))
}
// Flush here so messages coming back into client.
nc.Flush()
// Now add drain state.
time.Sleep(10 * time.Millisecond)
nc.Drain()
// Wait for the closed state from nc
select {
case <-done:
errs := atomic.LoadInt32(&errors)
if errs > 0 {
t.Fatalf("Did not expect any errors, got %d", errs)
}
r := atomic.LoadInt32(&received)
if r != expected {
t.Fatalf("Did not receive all messages from Drain, %d vs %d", r, expected)
}
break
case <-time.After(2 * time.Second):
t.Fatalf("Timeout waiting for closed state for connection")
}
}
func TestDrainConnLastError(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
done := make(chan bool, 1)
closedCb := func(nc *nats.Conn) {
done <- true
}
nc, err := nats.Connect(nats.DefaultURL,
nats.ClosedHandler(closedCb),
nats.DrainTimeout(time.Millisecond))
if err != nil {
t.Fatalf("Failed to create default connection: %v", err)
}
defer nc.Close()
// Override default handler for test.
nc.SetErrorHandler(func(_ *nats.Conn, _ *nats.Subscription, _ error) {})
wg := sync.WaitGroup{}
wg.Add(1)
if _, err := nc.Subscribe("foo", func(_ *nats.Msg) {
// So they back up a bit in client to make drain timeout
time.Sleep(100 * time.Millisecond)
wg.Done()
}); err != nil {
t.Fatalf("Error creating subscription; %v", err)
}
if err := nc.Publish("foo", []byte("msg")); err != nil {
t.Fatalf("Error on publish: %v", err)
}
if err := nc.Drain(); err != nil {
t.Fatalf("Error on drain: %v", err)
}
select {
case <-done:
if e := nc.LastError(); e == nil || e != nats.ErrDrainTimeout {
t.Fatalf("Expected last error to be set to %v, got %v", nats.ErrDrainTimeout, e)
}
case <-time.After(2 * time.Second):
t.Fatalf("Timeout waiting for closed state for connection")
}
// Wait for subscription callback to return
wg.Wait()
}
func TestDrainConnDuringReconnect(t *testing.T) {
s := RunDefaultServer()
defer s.Shutdown()
done := make(chan bool, 1)
closedCb := func(nc *nats.Conn) {
done <- true
}
nc, err := nats.Connect(nats.DefaultURL,
nats.ClosedHandler(closedCb),
nats.DrainTimeout(20*time.Millisecond))
if err != nil {
t.Fatalf("Failed to create default connection: %v", err)
}
defer nc.Close()
// Shutdown the server.
s.Shutdown()
waitFor(t, time.Second, 10*time.Millisecond, func() error {
if nc.IsReconnecting() {
return nil
}
return fmt.Errorf("Not reconnecting yet")
})
// This should work correctly.
if err := nc.Drain(); err != nats.ErrConnectionReconnecting {
t.Fatalf("Unexpected error on drain: %v", err)
}
// Closed should still fire.
select {
case <-done:
case <-time.After(2 * time.Second):
t.Fatalf("Timeout waiting for closed state for connection")
}
}