/
table_editor.go
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/
table_editor.go
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// Copyright 2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package plan
import (
"io"
"sync"
"github.com/dolthub/go-mysql-server/sql"
)
// TableEditorIter wraps the given iterator and calls the Begin and Complete functions on the given table.
type TableEditorIter struct {
once *sync.Once
onceCtx *sql.Context
openerClosers []sql.EditOpenerCloser
inner sql.RowIter
errorEncountered error
}
var _ sql.RowIter = (*TableEditorIter)(nil)
// NewTableEditorIter returns a new *tableEditorIter by wrapping the given iterator. If the
// "statement_boundaries" session variable is set to false, then the original iterator is returned.
// Each of the |openerClosers| specified will be called to begin, complete, and discard statements as
// needed as the |wrappedIter| is processed.
func NewTableEditorIter(wrappedIter sql.RowIter, openerClosers ...sql.EditOpenerCloser) sql.RowIter {
return &TableEditorIter{
once: &sync.Once{},
openerClosers: openerClosers,
inner: wrappedIter,
errorEncountered: nil,
}
}
// Next implements the interface sql.RowIter.
func (s *TableEditorIter) Next(ctx *sql.Context) (sql.Row, error) {
s.once.Do(func() {
for _, openerCloser := range s.openerClosers {
openerCloser.StatementBegin(ctx)
}
})
row, err := s.inner.Next(ctx)
if err != nil && err != io.EOF {
s.errorEncountered = err
return row, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
return row, err
}
// Close implements the interface sql.RowIter.
func (s *TableEditorIter) Close(ctx *sql.Context) error {
err := s.errorEncountered
_, ignoreError := err.(sql.IgnorableError)
if err != nil && !ignoreError {
for _, openerCloser := range s.openerClosers {
tempErr := openerCloser.DiscardChanges(ctx, s.errorEncountered)
if tempErr != nil {
err = tempErr
}
}
} else {
for _, openerCloser := range s.openerClosers {
tempErr := openerCloser.StatementComplete(ctx)
if tempErr != nil {
err = tempErr
}
}
}
if err != nil {
_ = s.inner.Close(ctx)
} else {
err = s.inner.Close(ctx)
}
return err
}
func (s *TableEditorIter) InnerIter() sql.RowIter {
return s.inner
}
type CheckpointingTableEditorIter struct {
editIter sql.EditOpenerCloser
inner sql.RowIter
}
var _ sql.RowIter = (*TableEditorIter)(nil)
// NewCheckpointingTableEditorIter is similar to NewTableEditorIter except that
// it returns an iter that calls BeginStatement and CompleteStatement on |table|
// after every iter of |wrappedIter|. While SLOW, this functionality ensures
// correctness for statements that need to rollback individual statements that
// error such as INSERT IGNORE INTO.
func NewCheckpointingTableEditorIter(wrappedIter sql.RowIter, table sql.EditOpenerCloser) sql.RowIter {
return &CheckpointingTableEditorIter{
editIter: table,
inner: wrappedIter,
}
}
func (c CheckpointingTableEditorIter) Next(ctx *sql.Context) (sql.Row, error) {
c.editIter.StatementBegin(ctx)
row, err := c.inner.Next(ctx)
if err != nil && err != io.EOF {
if dErr := c.editIter.DiscardChanges(ctx, err); dErr != nil {
return nil, dErr
}
return row, err
}
if sErr := c.editIter.StatementComplete(ctx); sErr != nil {
return row, sErr
}
return row, err
}
func (c CheckpointingTableEditorIter) InnerIter() sql.RowIter {
return c.inner
}
func (c CheckpointingTableEditorIter) Close(context *sql.Context) error {
return c.inner.Close(context)
}