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dex/vendor/github.com/lib/pq/notify_test.go

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2016-09-19 15:47:53 +00:00
package pq
import (
"errors"
"fmt"
"io"
"os"
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
var errNilNotification = errors.New("nil notification")
func expectNotification(t *testing.T, ch <-chan *Notification, relname string, extra string) error {
select {
case n := <-ch:
if n == nil {
return errNilNotification
}
if n.Channel != relname || n.Extra != extra {
return fmt.Errorf("unexpected notification %v", n)
}
return nil
case <-time.After(1500 * time.Millisecond):
return fmt.Errorf("timeout")
}
}
func expectNoNotification(t *testing.T, ch <-chan *Notification) error {
select {
case n := <-ch:
return fmt.Errorf("unexpected notification %v", n)
case <-time.After(100 * time.Millisecond):
return nil
}
}
func expectEvent(t *testing.T, eventch <-chan ListenerEventType, et ListenerEventType) error {
select {
case e := <-eventch:
if e != et {
return fmt.Errorf("unexpected event %v", e)
}
return nil
case <-time.After(1500 * time.Millisecond):
panic("expectEvent timeout")
}
}
func expectNoEvent(t *testing.T, eventch <-chan ListenerEventType) error {
select {
case e := <-eventch:
return fmt.Errorf("unexpected event %v", e)
case <-time.After(100 * time.Millisecond):
return nil
}
}
func newTestListenerConn(t *testing.T) (*ListenerConn, <-chan *Notification) {
datname := os.Getenv("PGDATABASE")
sslmode := os.Getenv("PGSSLMODE")
if datname == "" {
os.Setenv("PGDATABASE", "pqgotest")
}
if sslmode == "" {
os.Setenv("PGSSLMODE", "disable")
}
notificationChan := make(chan *Notification)
l, err := NewListenerConn("", notificationChan)
if err != nil {
t.Fatal(err)
}
return l, notificationChan
}
func TestNewListenerConn(t *testing.T) {
l, _ := newTestListenerConn(t)
defer l.Close()
}
func TestConnListen(t *testing.T) {
l, channel := newTestListenerConn(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
ok, err := l.Listen("notify_test")
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, channel, "notify_test", "")
if err != nil {
t.Fatal(err)
}
}
func TestConnUnlisten(t *testing.T) {
l, channel := newTestListenerConn(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
ok, err := l.Listen("notify_test")
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test")
err = expectNotification(t, channel, "notify_test", "")
if err != nil {
t.Fatal(err)
}
ok, err = l.Unlisten("notify_test")
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test")
if err != nil {
t.Fatal(err)
}
err = expectNoNotification(t, channel)
if err != nil {
t.Fatal(err)
}
}
func TestConnUnlistenAll(t *testing.T) {
l, channel := newTestListenerConn(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
ok, err := l.Listen("notify_test")
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test")
err = expectNotification(t, channel, "notify_test", "")
if err != nil {
t.Fatal(err)
}
ok, err = l.UnlistenAll()
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test")
if err != nil {
t.Fatal(err)
}
err = expectNoNotification(t, channel)
if err != nil {
t.Fatal(err)
}
}
func TestConnClose(t *testing.T) {
l, _ := newTestListenerConn(t)
defer l.Close()
err := l.Close()
if err != nil {
t.Fatal(err)
}
err = l.Close()
if err != errListenerConnClosed {
t.Fatalf("expected errListenerConnClosed; got %v", err)
}
}
func TestConnPing(t *testing.T) {
l, _ := newTestListenerConn(t)
defer l.Close()
err := l.Ping()
if err != nil {
t.Fatal(err)
}
err = l.Close()
if err != nil {
t.Fatal(err)
}
err = l.Ping()
if err != errListenerConnClosed {
t.Fatalf("expected errListenerConnClosed; got %v", err)
}
}
// Test for deadlock where a query fails while another one is queued
func TestConnExecDeadlock(t *testing.T) {
l, _ := newTestListenerConn(t)
defer l.Close()
var wg sync.WaitGroup
wg.Add(2)
go func() {
l.ExecSimpleQuery("SELECT pg_sleep(60)")
wg.Done()
}()
runtime.Gosched()
go func() {
l.ExecSimpleQuery("SELECT 1")
wg.Done()
}()
// give the two goroutines some time to get into position
runtime.Gosched()
// calls Close on the net.Conn; equivalent to a network failure
l.Close()
var done int32 = 0
go func() {
time.Sleep(10 * time.Second)
if atomic.LoadInt32(&done) != 1 {
panic("timed out")
}
}()
wg.Wait()
atomic.StoreInt32(&done, 1)
}
// Test for ListenerConn being closed while a slow query is executing
func TestListenerConnCloseWhileQueryIsExecuting(t *testing.T) {
l, _ := newTestListenerConn(t)
defer l.Close()
var wg sync.WaitGroup
wg.Add(1)
go func() {
sent, err := l.ExecSimpleQuery("SELECT pg_sleep(60)")
if sent {
panic("expected sent=false")
}
// could be any of a number of errors
if err == nil {
panic("expected error")
}
wg.Done()
}()
// give the above goroutine some time to get into position
runtime.Gosched()
err := l.Close()
if err != nil {
t.Fatal(err)
}
var done int32 = 0
go func() {
time.Sleep(10 * time.Second)
if atomic.LoadInt32(&done) != 1 {
panic("timed out")
}
}()
wg.Wait()
atomic.StoreInt32(&done, 1)
}
func TestNotifyExtra(t *testing.T) {
db := openTestConn(t)
defer db.Close()
if getServerVersion(t, db) < 90000 {
t.Skip("skipping NOTIFY payload test since the server does not appear to support it")
}
l, channel := newTestListenerConn(t)
defer l.Close()
ok, err := l.Listen("notify_test")
if !ok || err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_test, 'something'")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, channel, "notify_test", "something")
if err != nil {
t.Fatal(err)
}
}
// create a new test listener and also set the timeouts
func newTestListenerTimeout(t *testing.T, min time.Duration, max time.Duration) (*Listener, <-chan ListenerEventType) {
datname := os.Getenv("PGDATABASE")
sslmode := os.Getenv("PGSSLMODE")
if datname == "" {
os.Setenv("PGDATABASE", "pqgotest")
}
if sslmode == "" {
os.Setenv("PGSSLMODE", "disable")
}
eventch := make(chan ListenerEventType, 16)
l := NewListener("", min, max, func(t ListenerEventType, err error) { eventch <- t })
err := expectEvent(t, eventch, ListenerEventConnected)
if err != nil {
t.Fatal(err)
}
return l, eventch
}
func newTestListener(t *testing.T) (*Listener, <-chan ListenerEventType) {
return newTestListenerTimeout(t, time.Hour, time.Hour)
}
func TestListenerListen(t *testing.T) {
l, _ := newTestListener(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
err := l.Listen("notify_listen_test")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
}
func TestListenerUnlisten(t *testing.T) {
l, _ := newTestListener(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
err := l.Listen("notify_listen_test")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = l.Unlisten("notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNoNotification(t, l.Notify)
if err != nil {
t.Fatal(err)
}
}
func TestListenerUnlistenAll(t *testing.T) {
l, _ := newTestListener(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
err := l.Listen("notify_listen_test")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = l.UnlistenAll()
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNoNotification(t, l.Notify)
if err != nil {
t.Fatal(err)
}
}
func TestListenerFailedQuery(t *testing.T) {
l, eventch := newTestListener(t)
defer l.Close()
db := openTestConn(t)
defer db.Close()
err := l.Listen("notify_listen_test")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
// shouldn't cause a disconnect
ok, err := l.cn.ExecSimpleQuery("SELECT error")
if !ok {
t.Fatalf("could not send query to server: %v", err)
}
_, ok = err.(PGError)
if !ok {
t.Fatalf("unexpected error %v", err)
}
err = expectNoEvent(t, eventch)
if err != nil {
t.Fatal(err)
}
// should still work
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
}
func TestListenerReconnect(t *testing.T) {
l, eventch := newTestListenerTimeout(t, 20*time.Millisecond, time.Hour)
defer l.Close()
db := openTestConn(t)
defer db.Close()
err := l.Listen("notify_listen_test")
if err != nil {
t.Fatal(err)
}
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
// kill the connection and make sure it comes back up
ok, err := l.cn.ExecSimpleQuery("SELECT pg_terminate_backend(pg_backend_pid())")
if ok {
t.Fatalf("could not kill the connection: %v", err)
}
if err != io.EOF {
t.Fatalf("unexpected error %v", err)
}
err = expectEvent(t, eventch, ListenerEventDisconnected)
if err != nil {
t.Fatal(err)
}
err = expectEvent(t, eventch, ListenerEventReconnected)
if err != nil {
t.Fatal(err)
}
// should still work
_, err = db.Exec("NOTIFY notify_listen_test")
if err != nil {
t.Fatal(err)
}
// should get nil after Reconnected
err = expectNotification(t, l.Notify, "", "")
if err != errNilNotification {
t.Fatal(err)
}
err = expectNotification(t, l.Notify, "notify_listen_test", "")
if err != nil {
t.Fatal(err)
}
}
func TestListenerClose(t *testing.T) {
l, _ := newTestListenerTimeout(t, 20*time.Millisecond, time.Hour)
defer l.Close()
err := l.Close()
if err != nil {
t.Fatal(err)
}
err = l.Close()
if err != errListenerClosed {
t.Fatalf("expected errListenerClosed; got %v", err)
}
}
func TestListenerPing(t *testing.T) {
l, _ := newTestListenerTimeout(t, 20*time.Millisecond, time.Hour)
defer l.Close()
err := l.Ping()
if err != nil {
t.Fatal(err)
}
err = l.Close()
if err != nil {
t.Fatal(err)
}
err = l.Ping()
if err != errListenerClosed {
t.Fatalf("expected errListenerClosed; got %v", err)
}
}