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Copy pathlarge_objects_test.go
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265 lines (224 loc) · 4.46 KB
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package pgx_test
import (
"io"
"testing"
"github.com/jackc/pgx"
)
func TestLargeObjects(t *testing.T) {
t.Parallel()
conn, err := pgx.Connect(*defaultConnConfig)
if err != nil {
t.Fatal(err)
}
tx, err := conn.Begin()
if err != nil {
t.Fatal(err)
}
lo, err := tx.LargeObjects()
if err != nil {
t.Fatal(err)
}
id, err := lo.Create(0)
if err != nil {
t.Fatal(err)
}
obj, err := lo.Open(id, pgx.LargeObjectModeRead|pgx.LargeObjectModeWrite)
if err != nil {
t.Fatal(err)
}
n, err := obj.Write([]byte("testing"))
if err != nil {
t.Fatal(err)
}
if n != 7 {
t.Errorf("Expected n to be 7, got %d", n)
}
pos, err := obj.Seek(1, 0)
if err != nil {
t.Fatal(err)
}
if pos != 1 {
t.Errorf("Expected pos to be 1, got %d", pos)
}
res := make([]byte, 6)
n, err = obj.Read(res)
if err != nil {
t.Fatal(err)
}
if string(res) != "esting" {
t.Errorf(`Expected res to be "esting", got %q`, res)
}
if n != 6 {
t.Errorf("Expected n to be 6, got %d", n)
}
n, err = obj.Read(res)
if err != io.EOF {
t.Error("Expected io.EOF, go nil")
}
if n != 0 {
t.Errorf("Expected n to be 0, got %d", n)
}
pos, err = obj.Tell()
if err != nil {
t.Fatal(err)
}
if pos != 7 {
t.Errorf("Expected pos to be 7, got %d", pos)
}
err = obj.Truncate(1)
if err != nil {
t.Fatal(err)
}
pos, err = obj.Seek(-1, 2)
if err != nil {
t.Fatal(err)
}
if pos != 0 {
t.Errorf("Expected pos to be 0, got %d", pos)
}
res = make([]byte, 2)
n, err = obj.Read(res)
if err != io.EOF {
t.Errorf("Expected err to be io.EOF, got %v", err)
}
if n != 1 {
t.Errorf("Expected n to be 1, got %d", n)
}
if res[0] != 't' {
t.Errorf("Expected res[0] to be 't', got %v", res[0])
}
err = obj.Close()
if err != nil {
t.Fatal(err)
}
err = lo.Unlink(id)
if err != nil {
t.Fatal(err)
}
_, err = lo.Open(id, pgx.LargeObjectModeRead)
if e, ok := err.(pgx.PgError); !ok || e.Code != "42704" {
t.Errorf("Expected undefined_object error (42704), got %#v", err)
}
}
func TestLargeObjectsMultipleTransactions(t *testing.T) {
t.Parallel()
conn, err := pgx.Connect(*defaultConnConfig)
if err != nil {
t.Fatal(err)
}
tx, err := conn.Begin()
if err != nil {
t.Fatal(err)
}
lo, err := tx.LargeObjects()
if err != nil {
t.Fatal(err)
}
id, err := lo.Create(0)
if err != nil {
t.Fatal(err)
}
obj, err := lo.Open(id, pgx.LargeObjectModeWrite)
if err != nil {
t.Fatal(err)
}
n, err := obj.Write([]byte("testing"))
if err != nil {
t.Fatal(err)
}
if n != 7 {
t.Errorf("Expected n to be 7, got %d", n)
}
// Commit the first transaction
err = tx.Commit()
if err != nil {
t.Fatal(err)
}
// IMPORTANT: Use the same connection for another query
query := `select n from generate_series(1,10) n`
rows, err := conn.Query(query)
if err != nil {
t.Fatal(err)
}
rows.Close()
// Start a new transaction
tx2, err := conn.Begin()
if err != nil {
t.Fatal(err)
}
lo2, err := tx2.LargeObjects()
if err != nil {
t.Fatal(err)
}
// Reopen the large object in the new transaction
obj2, err := lo2.Open(id, pgx.LargeObjectModeRead|pgx.LargeObjectModeWrite)
if err != nil {
t.Fatal(err)
}
pos, err := obj2.Seek(1, 0)
if err != nil {
t.Fatal(err)
}
if pos != 1 {
t.Errorf("Expected pos to be 1, got %d", pos)
}
res := make([]byte, 6)
n, err = obj2.Read(res)
if err != nil {
t.Fatal(err)
}
if string(res) != "esting" {
t.Errorf(`Expected res to be "esting", got %q`, res)
}
if n != 6 {
t.Errorf("Expected n to be 6, got %d", n)
}
n, err = obj2.Read(res)
if err != io.EOF {
t.Error("Expected io.EOF, go nil")
}
if n != 0 {
t.Errorf("Expected n to be 0, got %d", n)
}
pos, err = obj2.Tell()
if err != nil {
t.Fatal(err)
}
if pos != 7 {
t.Errorf("Expected pos to be 7, got %d", pos)
}
err = obj2.Truncate(1)
if err != nil {
t.Fatal(err)
}
pos, err = obj2.Seek(-1, 2)
if err != nil {
t.Fatal(err)
}
if pos != 0 {
t.Errorf("Expected pos to be 0, got %d", pos)
}
res = make([]byte, 2)
n, err = obj2.Read(res)
if err != io.EOF {
t.Errorf("Expected err to be io.EOF, got %v", err)
}
if n != 1 {
t.Errorf("Expected n to be 1, got %d", n)
}
if res[0] != 't' {
t.Errorf("Expected res[0] to be 't', got %v", res[0])
}
err = obj2.Close()
if err != nil {
t.Fatal(err)
}
err = lo2.Unlink(id)
if err != nil {
t.Fatal(err)
}
_, err = lo2.Open(id, pgx.LargeObjectModeRead)
if e, ok := err.(pgx.PgError); !ok || e.Code != "42704" {
t.Errorf("Expected undefined_object error (42704), got %#v", err)
}
}