tests: add failpoint to simulate lack of disk space

Signed-off-by: Marcondes Viana <marju10@gmail.com>

tests/failpoint/db_failpoint_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	bolt "go.etcd.io/bbolt"
+	"go.etcd.io/bbolt/errors"
 	"go.etcd.io/bbolt/internal/btesting"
 	gofail "go.etcd.io/gofail/runtime"
 )
@@ -122,3 +123,35 @@ func TestFailpoint_ResizeFileFail(t *testing.T) {
 
 	require.NoError(t, err)
 }
+
+func TestFailpoint_LackOfDiskSpace(t *testing.T) {
+	db := btesting.MustCreateDB(t)
+
+	err := gofail.Enable("lackOfDiskSpace", `return("grow somehow failed")`)
+	require.NoError(t, err)
+
+	tx, err := db.Begin(true)
+	require.NoError(t, err)
+
+	err = tx.Commit()
+	require.Error(t, err)
+	require.ErrorContains(t, err, "grow somehow failed")
+
+	err = tx.Rollback()
+	require.Error(t, err)
+	require.ErrorIs(t, err, errors.ErrTxClosed)
+
+	// It should work after disabling the failpoint.
+	err = gofail.Disable("lackOfDiskSpace")
+	require.NoError(t, err)
+
+	tx, err = db.Begin(true)
+	require.NoError(t, err)
+
+	err = tx.Commit()
+	require.NoError(t, err)
+
+	err = tx.Rollback()
+	require.Error(t, err)
+	require.ErrorIs(t, err, errors.ErrTxClosed)
+}

tx.go

@@ -1,6 +1,7 @@
 package bbolt
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -10,7 +11,7 @@ import (
 	"time"
 	"unsafe"
 
-	"go.etcd.io/bbolt/errors"
+	berrors "go.etcd.io/bbolt/errors"
 	"go.etcd.io/bbolt/internal/common"
 )
 
@@ -142,9 +143,9 @@ func (tx *Tx) OnCommit(fn func()) {
 func (tx *Tx) Commit() error {
 	common.Assert(!tx.managed, "managed tx commit not allowed")
 	if tx.db == nil {
-		return errors.ErrTxClosed
+		return berrors.ErrTxClosed
 	} else if !tx.writable {
-		return errors.ErrTxNotWritable
+		return berrors.ErrTxNotWritable
 	}
 
 	// TODO(benbjohnson): Use vectorized I/O to write out dirty pages.
@@ -185,6 +186,10 @@ func (tx *Tx) Commit() error {
 
 	// If the high water mark has moved up then attempt to grow the database.
 	if tx.meta.Pgid() > opgid {
+		_ = errors.New("")
+		// gofail: var lackOfDiskSpace string
+		// tx.rollback()
+		// return errors.New(lackOfDiskSpace)
 		if err := tx.db.grow(int(tx.meta.Pgid()+1) * tx.db.pageSize); err != nil {
 			tx.rollback()
 			return err
@@ -254,7 +259,7 @@ func (tx *Tx) commitFreelist() error {
 func (tx *Tx) Rollback() error {
 	common.Assert(!tx.managed, "managed tx rollback not allowed")
 	if tx.db == nil {
-		return errors.ErrTxClosed
+		return berrors.ErrTxClosed
 	}
 	tx.nonPhysicalRollback()
 	return nil
@@ -561,13 +566,13 @@ func (tx *Tx) forEachPageInternal(pgidstack []common.Pgid, fn func(*common.Page,
 // This is only safe for concurrent use when used by a writable transaction.
 func (tx *Tx) Page(id int) (*common.PageInfo, error) {
 	if tx.db == nil {
-		return nil, errors.ErrTxClosed
+		return nil, berrors.ErrTxClosed
 	} else if common.Pgid(id) >= tx.meta.Pgid() {
 		return nil, nil
 	}
 
 	if tx.db.freelist == nil {
-		return nil, errors.ErrFreePagesNotLoaded
+		return nil, berrors.ErrFreePagesNotLoaded
 	}
 
 	// Build the page info.