func mustExec(t testing.TB, conn *pgx.Conn, sql string, arguments ...interface{}) (commandTag pgx.CommandTag) {
var err error
if commandTag, err = conn.Exec(sql, arguments...); err != nil {
t.Fatalf("Exec unexpectedly failed with %v: %v", sql, err)
}
return
}
func unlistenAndRelease(pool *pgx.ConnPool, conn *pgx.Conn, channel string) {
_, err := conn.Exec(fmt.Sprintf(sqlUnlisten, channel))
if err != nil {
conn.Close()
return
}
pool.Release(conn)
}
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 insertRow(c *C, conn *pgx.Conn, n int) {
_, err := conn.Exec("INSERT INTO test (id) VALUES ($1)", n)
c.Assert(err, IsNil)
}
func createTable(c *C, conn *pgx.Conn) {
_, err := conn.Exec("CREATE TABLE test (id bigint PRIMARY KEY)")
c.Assert(err, IsNil)
insertRow(c, conn, 1)
}