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Copy pathconn_pool_test.go
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982 lines (801 loc) · 23.1 KB
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package pgx_test
import (
"errors"
"fmt"
"net"
"sync"
"testing"
"time"
"github.com/jackc/pgx"
)
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 acquireAllConnections(t *testing.T, pool *pgx.ConnPool, maxConnections int) []*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 connections
}
func releaseAllConnections(pool *pgx.ConnPool, connections []*pgx.Conn) {
for _, c := range connections {
pool.Release(c)
}
}
func acquireWithTimeTaken(pool *pgx.ConnPool) (*pgx.Conn, time.Duration, error) {
startTime := time.Now()
c, err := pool.Acquire()
return c, time.Since(startTime), err
}
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 TestPoolAcquireAndReleaseCycle(t *testing.T) {
t.Parallel()
maxConnections := 2
incrementCount := int32(100)
completeSync := make(chan int)
pool := createConnPool(t, maxConnections)
defer pool.Close()
allConnections := acquireAllConnections(t, pool, maxConnections)
for _, c := range allConnections {
mustExec(t, c, "create temporary table t(counter integer not null)")
mustExec(t, c, "insert into t(counter) values(0);")
}
releaseAllConnections(pool, allConnections)
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 = acquireAllConnections(t, pool, maxConnections)
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")
}
releaseAllConnections(pool, allConnections)
}
func TestPoolNonBlockingConnections(t *testing.T) {
t.Parallel()
var dialCountLock sync.Mutex
dialCount := 0
openTimeout := 1 * time.Second
testDialer := func(network, address string) (net.Conn, error) {
var firstDial bool
dialCountLock.Lock()
dialCount++
firstDial = dialCount == 1
dialCountLock.Unlock()
if firstDial {
return net.Dial(network, address)
} else {
time.Sleep(openTimeout)
return nil, &net.OpError{Op: "dial", Net: "tcp"}
}
}
maxConnections := 3
config := pgx.ConnPoolConfig{
ConnConfig: *defaultConnConfig,
MaxConnections: maxConnections,
}
config.ConnConfig.Dial = testDialer
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Expected NewConnPool not to fail, instead it failed with: %v", err)
}
defer pool.Close()
// NewConnPool establishes an initial connection
// so we need to close that for the rest of the test
if conn, err := pool.Acquire(); err == nil {
conn.Close()
pool.Release(conn)
} else {
t.Fatalf("pool.Acquire unexpectedly failed: %v", err)
}
var wg sync.WaitGroup
wg.Add(maxConnections)
startedAt := time.Now()
for i := 0; i < maxConnections; i++ {
go func() {
_, err := pool.Acquire()
wg.Done()
if err == nil {
t.Fatal("Acquire() expected to fail but it did not")
}
}()
}
wg.Wait()
// Prior to createConnectionUnlocked() use the test took
// maxConnections * openTimeout seconds to complete.
// With createConnectionUnlocked() it takes ~ 1 * openTimeout seconds.
timeTaken := time.Since(startedAt)
if timeTaken > openTimeout+1*time.Second {
t.Fatalf("Expected all Acquire() to run in parallel and take about %v, instead it took '%v'", openTimeout, timeTaken)
}
}
func TestAcquireTimeoutSanity(t *testing.T) {
t.Parallel()
config := pgx.ConnPoolConfig{
ConnConfig: *defaultConnConfig,
MaxConnections: 1,
}
// case 1: default 0 value
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Expected NewConnPool with default config.AcquireTimeout not to fail, instead it failed with '%v'", err)
}
pool.Close()
// case 2: negative value
config.AcquireTimeout = -1 * time.Second
_, err = pgx.NewConnPool(config)
if err == nil {
t.Fatal("Expected NewConnPool with negative config.AcquireTimeout to fail, instead it did not")
}
// case 3: positive value
config.AcquireTimeout = 1 * time.Second
pool, err = pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Expected NewConnPool with positive config.AcquireTimeout not to fail, instead it failed with '%v'", err)
}
defer pool.Close()
}
func TestPoolWithAcquireTimeoutSet(t *testing.T) {
t.Parallel()
connAllocTimeout := 2 * time.Second
config := pgx.ConnPoolConfig{
ConnConfig: *defaultConnConfig,
MaxConnections: 1,
AcquireTimeout: connAllocTimeout,
}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Unable to create connection pool: %v", err)
}
defer pool.Close()
// Consume all connections ...
allConnections := acquireAllConnections(t, pool, config.MaxConnections)
defer releaseAllConnections(pool, allConnections)
// ... then try to consume 1 more. It should fail after a short timeout.
_, timeTaken, err := acquireWithTimeTaken(pool)
if err == nil || err != pgx.ErrAcquireTimeout {
t.Fatalf("Expected error to be pgx.ErrAcquireTimeout, instead it was '%v'", err)
}
if timeTaken < connAllocTimeout {
t.Fatalf("Expected connection allocation time to be at least %v, instead it was '%v'", connAllocTimeout, timeTaken)
}
}
func TestPoolWithoutAcquireTimeoutSet(t *testing.T) {
t.Parallel()
maxConnections := 1
pool := createConnPool(t, maxConnections)
defer pool.Close()
// Consume all connections ...
allConnections := acquireAllConnections(t, pool, maxConnections)
// ... then try to consume 1 more. It should hang forever.
// To unblock it we release the previously taken connection in a goroutine.
stopDeadWaitTimeout := 5 * time.Second
timer := time.AfterFunc(stopDeadWaitTimeout, func() {
releaseAllConnections(pool, allConnections)
})
defer timer.Stop()
conn, timeTaken, err := acquireWithTimeTaken(pool)
if err == nil {
pool.Release(conn)
} else {
t.Fatalf("Expected error to be nil, instead it was '%v'", err)
}
if timeTaken < stopDeadWaitTimeout {
t.Fatalf("Expected connection allocation time to be at least %v, instead it was '%v'", stopDeadWaitTimeout, timeTaken)
}
}
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("selct"); 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, pg_sleep(0.02)")
rows.Close()
pool.Release(c)
}
for i := 0; i < 10; 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 < 10; 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()
// Run timing sensitive test many times
for i := 0; i < 50; i++ {
func() {
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 TestConnPoolResetClosesCheckedOutConnectionsOnRelease(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 5)
defer pool.Close()
inProgressRows := []*pgx.Rows{}
var inProgressPIDs []int32
// Start some queries and reset pool while they are in progress
for i := 0; i < 10; i++ {
rows, err := pool.Query("select pg_backend_pid() union all select 1 union all select 2")
if err != nil {
t.Fatal(err)
}
rows.Next()
var pid int32
rows.Scan(&pid)
inProgressPIDs = append(inProgressPIDs, pid)
inProgressRows = append(inProgressRows, rows)
pool.Reset()
}
// Check that the queries are completed
for _, rows := range inProgressRows {
var expectedN int32
for rows.Next() {
expectedN++
var n int32
err := rows.Scan(&n)
if err != nil {
t.Fatal(err)
}
if expectedN != n {
t.Fatalf("Expected n to be %d, but it was %d", expectedN, n)
}
}
if err := rows.Err(); err != nil {
t.Fatal(err)
}
}
// pool should be in fresh state due to previous reset
stats := pool.Stat()
if stats.CurrentConnections != 0 || stats.AvailableConnections != 0 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
var connCount int
err := pool.QueryRow("select count(*) from pg_stat_activity where pid = any($1::int4[])", inProgressPIDs).Scan(&connCount)
if err != nil {
t.Fatal(err)
}
if connCount != 0 {
t.Fatalf("%d connections not closed", connCount)
}
}
func TestConnPoolResetClosesCheckedInConnections(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 5)
defer pool.Close()
inProgressRows := []*pgx.Rows{}
var inProgressPIDs []int32
// Start some queries and reset pool while they are in progress
for i := 0; i < 5; i++ {
rows, err := pool.Query("select pg_backend_pid()")
if err != nil {
t.Fatal(err)
}
inProgressRows = append(inProgressRows, rows)
}
// Check that the queries are completed
for _, rows := range inProgressRows {
for rows.Next() {
var pid int32
err := rows.Scan(&pid)
if err != nil {
t.Fatal(err)
}
inProgressPIDs = append(inProgressPIDs, pid)
}
if err := rows.Err(); err != nil {
t.Fatal(err)
}
}
// Ensure pool is fully connected and available
stats := pool.Stat()
if stats.CurrentConnections != 5 || stats.AvailableConnections != 5 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
pool.Reset()
// Pool should be empty after reset
stats = pool.Stat()
if stats.CurrentConnections != 0 || stats.AvailableConnections != 0 {
t.Fatalf("Unexpected connection pool stats: %v", stats)
}
var connCount int
err := pool.QueryRow("select count(*) from pg_stat_activity where pid = any($1::int4[])", inProgressPIDs).Scan(&connCount)
if err != nil {
t.Fatal(err)
}
if connCount != 0 {
t.Fatalf("%d connections not closed", connCount)
}
}
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 TestConnPoolBeginRetry(t *testing.T) {
t.Parallel()
// Run timing sensitive test many times
for i := 0; i < 50; i++ {
func() {
pool := createConnPool(t, 2)
defer pool.Close()
killerConn, err := pool.Acquire()
if err != nil {
t.Fatal(err)
}
defer pool.Release(killerConn)
victimConn, err := pool.Acquire()
if err != nil {
t.Fatal(err)
}
pool.Release(victimConn)
// Terminate connection that was released to pool
if _, err = killerConn.Exec("select pg_terminate_backend($1)", victimConn.Pid); err != nil {
t.Fatalf("Unable to kill backend PostgreSQL process: %v", err)
}
// Since victimConn is the only available connection in the pool, pool.Begin should
// try to use it, fail, and allocate another connection
tx, err := pool.Begin()
if err != nil {
t.Fatalf("pool.Begin failed: %v", err)
}
defer tx.Rollback()
var txPid int32
err = tx.QueryRow("select pg_backend_pid()").Scan(&txPid)
if err != nil {
t.Fatalf("tx.QueryRow Scan failed: %v", err)
}
if txPid == victimConn.Pid {
t.Error("Expected txPid to defer from killed conn pid, but it didn't")
}
}()
}
}
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: %v", 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 TestConnPoolQueryConcurrentLoad(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 10)
defer pool.Close()
n := 100
done := make(chan bool)
for i := 0; i < n; i++ {
go func() {
defer func() { done <- true }()
var rowCount int32
rows, err := pool.Query("select generate_series(1,$1)", 1000)
if err != nil {
t.Fatalf("pool.Query failed: %v", err)
}
defer rows.Close()
for rows.Next() {
var n int32
err = rows.Scan(&n)
if err != nil {
t.Fatalf("rows.Scan failed: %v", err)
}
if n != rowCount+1 {
t.Fatalf("Expected n to be %d, but it was %d", rowCount+1, n)
}
rowCount++
}
if rows.Err() != nil {
t.Fatalf("conn.Query failed: %v", rows.Err())
}
if rowCount != 1000 {
t.Error("Select called onDataRow wrong number of times")
}
_, err = pool.Exec("--;")
if err != nil {
t.Fatalf("pool.Exec failed: %v", err)
}
}()
}
for i := 0; i < n; i++ {
<-done
}
}
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)
}
}
func TestConnPoolExec(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
results, err := pool.Exec("create temporary table foo(id integer primary key);")
if err != nil {
t.Fatalf("Unexpected error from pool.Exec: %v", err)
}
if results != "CREATE TABLE" {
t.Errorf("Unexpected results from Exec: %v", results)
}
results, err = pool.Exec("insert into foo(id) values($1)", 1)
if err != nil {
t.Fatalf("Unexpected error from pool.Exec: %v", err)
}
if results != "INSERT 0 1" {
t.Errorf("Unexpected results from Exec: %v", results)
}
results, err = pool.Exec("drop table foo;")
if err != nil {
t.Fatalf("Unexpected error from pool.Exec: %v", err)
}
if results != "DROP TABLE" {
t.Errorf("Unexpected results from Exec: %v", results)
}
}
func TestConnPoolPrepare(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
_, err := pool.Prepare("test", "select $1::varchar")
if err != nil {
t.Fatalf("Unable to prepare statement: %v", err)
}
var s string
err = pool.QueryRow("test", "hello").Scan(&s)
if err != nil {
t.Errorf("Executing prepared statement failed: %v", err)
}
if s != "hello" {
t.Errorf("Prepared statement did not return expected value: %v", s)
}
err = pool.Deallocate("test")
if err != nil {
t.Errorf("Deallocate failed: %v", err)
}
err = pool.QueryRow("test", "hello").Scan(&s)
if err, ok := err.(pgx.PgError); !(ok && err.Code == "42601") {
t.Errorf("Expected error calling deallocated prepared statement, but got: %v", err)
}
}
func TestConnPoolPrepareDeallocatePrepare(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
_, err := pool.Prepare("test", "select $1::varchar")
if err != nil {
t.Fatalf("Unable to prepare statement: %v", err)
}
err = pool.Deallocate("test")
if err != nil {
t.Fatalf("Unable to deallocate statement: %v", err)
}
_, err = pool.Prepare("test", "select $1::varchar")
if err != nil {
t.Fatalf("Unable to prepare statement: %v", err)
}
var s string
err = pool.QueryRow("test", "hello").Scan(&s)
if err != nil {
t.Fatalf("Executing prepared statement failed: %v", err)
}
if s != "hello" {
t.Errorf("Prepared statement did not return expected value: %v", s)
}
}
func TestConnPoolPrepareWhenConnIsAlreadyAcquired(t *testing.T) {
t.Parallel()
pool := createConnPool(t, 2)
defer pool.Close()
testPreparedStatement := func(db queryRower, desc string) {
var s string
err := db.QueryRow("test", "hello").Scan(&s)
if err != nil {
t.Fatalf("%s. Executing prepared statement failed: %v", desc, err)
}
if s != "hello" {
t.Fatalf("%s. Prepared statement did not return expected value: %v", desc, s)
}
}
newReleaseOnce := func(c *pgx.Conn) func() {
var once sync.Once
return func() {
once.Do(func() { pool.Release(c) })
}
}
c1, err := pool.Acquire()
if err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
c1Release := newReleaseOnce(c1)
defer c1Release()
_, err = pool.Prepare("test", "select $1::varchar")
if err != nil {
t.Fatalf("Unable to prepare statement: %v", err)
}
testPreparedStatement(pool, "pool")
c1Release()
c2, err := pool.Acquire()
if err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
c2Release := newReleaseOnce(c2)
defer c2Release()
// This conn will not be available and will be connection at this point
c3, err := pool.Acquire()
if err != nil {
t.Fatalf("Unable to acquire connection: %v", err)
}
c3Release := newReleaseOnce(c3)
defer c3Release()
testPreparedStatement(c2, "c2")
testPreparedStatement(c3, "c3")
c2Release()
c3Release()
err = pool.Deallocate("test")
if err != nil {
t.Errorf("Deallocate failed: %v", err)
}
var s string
err = pool.QueryRow("test", "hello").Scan(&s)
if err, ok := err.(pgx.PgError); !(ok && err.Code == "42601") {
t.Errorf("Expected error calling deallocated prepared statement, but got: %v", err)
}
}