/
conn_pool_test.go
433 lines (352 loc) · 9.93 KB
/
conn_pool_test.go
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package pgx_test
import (
"errors"
"fmt"
"github.com/jackc/pgx"
"sync"
"testing"
)
func createConnPool(t *testing.T, maxConnections int) *pgx.ConnPool {
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: maxConnections}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Unable to create connection pool: %v", err)
}
return pool
}
func TestNewConnPool(t *testing.T) {
t.Parallel()
var numCallbacks int
afterConnect := func(c *pgx.Conn) error {
numCallbacks++
return nil
}
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 2, AfterConnect: afterConnect}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatal("Unable to establish connection pool")
}
defer pool.Close()
// It initially connects once
stat := pool.Stat()
if stat.CurrentConnections != 1 {
t.Errorf("Expected 1 connection to be established immediately, but %v were", numCallbacks)
}
// Pool creation returns an error if any AfterConnect callback does
errAfterConnect := errors.New("Some error")
afterConnect = func(c *pgx.Conn) error {
return errAfterConnect
}
config = pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 2, AfterConnect: afterConnect}
pool, err = pgx.NewConnPool(config)
if err != errAfterConnect {
t.Errorf("Expected errAfterConnect but received unexpected: %v", err)
}
}
func TestNewConnPoolDefaultsTo5MaxConnections(t *testing.T) {
t.Parallel()
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatal("Unable to establish connection pool")
}
defer pool.Close()
if n := pool.Stat().MaxConnections; n != 5 {
t.Fatalf("Expected pool to default to 5 max connections, but it was %d", n)
}
}
func TestNewConnPoolMaxConnectionsCannotBeLessThan2(t *testing.T) {
t.Parallel()
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 1}
pool, err := pgx.NewConnPool(config)
if err == nil {
pool.Close()
t.Fatal(`Expected NewConnPool to fail with "MaxConnections must be at least 2" error, but it succeeded`)
}
if err.Error() != "MaxConnections must be at least 2" {
t.Fatalf(`Expected NewConnPool to fail with "MaxConnections must be at least 2" error, but it failed with %v`, err)
}
}
func TestPoolAcquireAndReleaseCycle(t *testing.T) {
t.Parallel()
maxConnections := 2
incrementCount := int32(100)
completeSync := make(chan int)
pool := createConnPool(t, maxConnections)
defer pool.Close()
acquireAll := func() (connections []*pgx.Conn) {
connections = make([]*pgx.Conn, maxConnections)
for i := 0; i < maxConnections; i++ {
var err error
if connections[i], err = pool.Acquire(); err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
}
return
}
allConnections := acquireAll()
for _, c := range allConnections {
mustExec(t, c, "create temporary table t(counter integer not null)")
mustExec(t, c, "insert into t(counter) values(0);")
}
for _, c := range allConnections {
pool.Release(c)
}
f := func() {
conn, err := pool.Acquire()
if err != nil {
t.Fatal("Unable to acquire connection")
}
defer pool.Release(conn)
// Increment counter...
mustExec(t, conn, "update t set counter = counter + 1")
completeSync <- 0
}
for i := int32(0); i < incrementCount; i++ {
go f()
}
// Wait for all f() to complete
for i := int32(0); i < incrementCount; i++ {
<-completeSync
}
// Check that temp table in each connection has been incremented some number of times
actualCount := int32(0)
allConnections = acquireAll()
for _, c := range allConnections {
var n int32
c.QueryRow("select counter from t").Scan(&n)
if n == 0 {
t.Error("A connection was never used")
}
actualCount += n
}
if actualCount != incrementCount {
fmt.Println(actualCount)
t.Error("Wrong number of increments")
}
for _, c := range allConnections {
pool.Release(c)
}
}
func TestPoolReleaseWithTransactions(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
conn, err := pool.Acquire()
if err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
mustExec(t, conn, "begin")
if _, err = conn.Exec("select"); err == nil {
t.Fatal("Did not receive expected error")
}
if conn.TxStatus != 'E' {
t.Fatalf("Expected TxStatus to be 'E', instead it was '%c'", conn.TxStatus)
}
pool.Release(conn)
if conn.TxStatus != 'I' {
t.Fatalf("Expected release to rollback errored transaction, but it did not: '%c'", conn.TxStatus)
}
conn, err = pool.Acquire()
if err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
mustExec(t, conn, "begin")
if conn.TxStatus != 'T' {
t.Fatalf("Expected txStatus to be 'T', instead it was '%c'", conn.TxStatus)
}
pool.Release(conn)
if conn.TxStatus != 'I' {
t.Fatalf("Expected release to rollback uncommitted transaction, but it did not: '%c'", conn.TxStatus)
}
}
func TestPoolAcquireAndReleaseCycleAutoConnect(t *testing.T) {
t.Parallel()
maxConnections := 3
pool := createConnPool(t, maxConnections)
defer pool.Close()
doSomething := func() {
c, err := pool.Acquire()
if err != nil {
t.Fatalf("Unable to Acquire: %v", err)
}
rows, _ := c.Query("select 1")
rows.Close()
pool.Release(c)
}
for i := 0; i < 1000; i++ {
doSomething()
}
stat := pool.Stat()
if stat.CurrentConnections != 1 {
t.Fatalf("Pool shouldn't have established more connections when no contention: %v", stat.CurrentConnections)
}
var wg sync.WaitGroup
for i := 0; i < 1000; i++ {
wg.Add(1)
go func() {
defer wg.Done()
doSomething()
}()
}
wg.Wait()
stat = pool.Stat()
if stat.CurrentConnections != stat.MaxConnections {
t.Fatalf("Pool should have used all possible connections: %v", stat.CurrentConnections)
}
}
func TestPoolReleaseDiscardsDeadConnections(t *testing.T) {
t.Parallel()
maxConnections := 3
pool := createConnPool(t, maxConnections)
defer pool.Close()
var c1, c2 *pgx.Conn
var err error
var stat pgx.ConnPoolStat
if c1, err = pool.Acquire(); err != nil {
t.Fatalf("Unexpected error acquiring connection: %v", err)
}
defer func() {
if c1 != nil {
pool.Release(c1)
}
}()
if c2, err = pool.Acquire(); err != nil {
t.Fatalf("Unexpected error acquiring connection: %v", err)
}
defer func() {
if c2 != nil {
pool.Release(c2)
}
}()
if _, err = c2.Exec("select pg_terminate_backend($1)", c1.Pid); err != nil {
t.Fatalf("Unable to kill backend PostgreSQL process: %v", err)
}
// do something with the connection so it knows it's dead
rows, _ := c1.Query("select 1")
rows.Close()
if rows.Err() == nil {
t.Fatal("Expected error but none occurred")
}
if c1.IsAlive() {
t.Fatal("Expected connection to be dead but it wasn't")
}
stat = pool.Stat()
if stat.CurrentConnections != 2 {
t.Fatalf("Unexpected CurrentConnections: %v", stat.CurrentConnections)
}
if stat.AvailableConnections != 0 {
t.Fatalf("Unexpected AvailableConnections: %v", stat.CurrentConnections)
}
pool.Release(c1)
c1 = nil // so it doesn't get released again by the defer
stat = pool.Stat()
if stat.CurrentConnections != 1 {
t.Fatalf("Unexpected CurrentConnections: %v", stat.CurrentConnections)
}
if stat.AvailableConnections != 0 {
t.Fatalf("Unexpected AvailableConnections: %v", stat.CurrentConnections)
}
}
func TestConnPoolTransaction(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
stats := pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 1 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
tx, err := pool.Begin()
if err != nil {
t.Fatalf("pool.Begin failed: %v", err)
}
defer tx.Rollback()
var n int32
err = tx.QueryRow("select 40+$1", 2).Scan(&n)
if err != nil {
t.Fatalf("tx.QueryRow Scan failed: %v", err)
}
if n != 42 {
t.Errorf("Expected 42, got %d", n)
}
stats = pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 0 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
err = tx.Rollback()
if err != nil {
t.Fatalf("tx.Rollback failed: %v", err)
}
stats = pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 1 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
}
func TestConnPoolTransactionIso(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
tx, err := pool.BeginIso(pgx.Serializable)
if err != nil {
t.Fatalf("pool.Begin failed: %v", err)
}
defer tx.Rollback()
var level string
err = tx.QueryRow("select current_setting('transaction_isolation')").Scan(&level)
if err != nil {
t.Fatalf("tx.QueryRow failed: %v", level)
}
if level != "serializable" {
t.Errorf("Expected to be in isolation level %v but was %v", "serializable", level)
}
}
func TestConnPoolQuery(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
var sum, rowCount int32
rows, err := pool.Query("select generate_series(1,$1)", 10)
if err != nil {
t.Fatalf("pool.Query failed: %v", err)
}
stats := pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 0 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
for rows.Next() {
var n int32
rows.Scan(&n)
sum += n
rowCount++
}
if rows.Err() != nil {
t.Fatalf("conn.Query failed: ", err)
}
if rowCount != 10 {
t.Error("Select called onDataRow wrong number of times")
}
if sum != 55 {
t.Error("Wrong values returned")
}
stats = pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 1 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
}
func TestConnPoolQueryRow(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
var n int32
err := pool.QueryRow("select 40+$1", 2).Scan(&n)
if err != nil {
t.Fatalf("pool.QueryRow Scan failed: %v", err)
}
if n != 42 {
t.Errorf("Expected 42, got %d", n)
}
stats := pool.Stat()
if stats.CurrentConnections != 1 || stats.AvailableConnections != 1 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
}