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codex.go
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codex.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tabletserver
import (
"bytes"
"fmt"
"github.com/youtube/vitess/go/sqltypes"
"github.com/youtube/vitess/go/vt/schema"
"github.com/youtube/vitess/go/vt/sqlparser"
vtrpcpb "github.com/youtube/vitess/go/vt/proto/vtrpc"
)
// buildValueList builds the set of PK reference rows used to drive the next query.
// It uses the PK values supplied in the original query and bind variables.
// The generated reference rows are validated for type match against the PK of the table.
func buildValueList(tableInfo *TableInfo, pkValues []interface{}, bindVars map[string]interface{}) ([][]sqltypes.Value, error) {
resolved, length, err := resolvePKValues(tableInfo, pkValues, bindVars)
if err != nil {
return nil, err
}
valueList := make([][]sqltypes.Value, length)
for i := 0; i < length; i++ {
valueList[i] = make([]sqltypes.Value, len(resolved))
for j, val := range resolved {
if list, ok := val.([]sqltypes.Value); ok {
valueList[i][j] = list[i]
} else {
valueList[i][j] = val.(sqltypes.Value)
}
}
}
return valueList, nil
}
func resolvePKValues(tableInfo *TableInfo, pkValues []interface{}, bindVars map[string]interface{}) (resolved []interface{}, length int, err error) {
length = -1
setLengthFunc := func(list []sqltypes.Value) error {
if length == -1 {
length = len(list)
} else if len(list) != length {
return NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "mismatched lengths for values %v", pkValues)
}
return nil
}
resolved = make([]interface{}, len(pkValues))
for i, val := range pkValues {
switch val := val.(type) {
case string:
if val[1] != ':' {
resolved[i], err = resolveValue(tableInfo.GetPKColumn(i), val, bindVars)
if err != nil {
return nil, 0, err
}
} else {
list, err := resolveListArg(tableInfo.GetPKColumn(i), val, bindVars)
if err != nil {
return nil, 0, err
}
if err := setLengthFunc(list); err != nil {
return nil, 0, err
}
resolved[i] = list
}
case []interface{}:
list := make([]sqltypes.Value, len(val))
for j, listVal := range val {
list[j], err = resolveValue(tableInfo.GetPKColumn(i), listVal, bindVars)
if err != nil {
return nil, 0, err
}
}
if err := setLengthFunc(list); err != nil {
return nil, 0, err
}
resolved[i] = list
default:
resolved[i], err = resolveValue(tableInfo.GetPKColumn(i), val, nil)
if err != nil {
return nil, 0, err
}
}
}
if length == -1 {
length = 1
}
return resolved, length, nil
}
func resolveListArg(col *schema.TableColumn, key string, bindVars map[string]interface{}) ([]sqltypes.Value, error) {
val, _, err := sqlparser.FetchBindVar(key, bindVars)
if err != nil {
return nil, NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "%v", err)
}
list := val.([]interface{})
resolved := make([]sqltypes.Value, len(list))
for i, v := range list {
sqlval, err := sqltypes.BuildConverted(col.Type, v)
if err != nil {
return nil, NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "%v", err)
}
if err = validateValue(col, sqlval); err != nil {
return nil, err
}
resolved[i] = sqlval
}
return resolved, nil
}
// buildSecondaryList is used for handling ON DUPLICATE DMLs, or those that change the PK.
func buildSecondaryList(tableInfo *TableInfo, pkList [][]sqltypes.Value, secondaryList []interface{}, bindVars map[string]interface{}) ([][]sqltypes.Value, error) {
if secondaryList == nil {
return nil, nil
}
valueList := make([][]sqltypes.Value, len(pkList))
for i, row := range pkList {
valueList[i] = make([]sqltypes.Value, len(row))
for j, cell := range row {
if secondaryList[j] == nil {
valueList[i][j] = cell
} else {
var err error
if valueList[i][j], err = resolveValue(tableInfo.GetPKColumn(j), secondaryList[j], bindVars); err != nil {
return valueList, err
}
}
}
}
return valueList, nil
}
func resolveValue(col *schema.TableColumn, value interface{}, bindVars map[string]interface{}) (result sqltypes.Value, err error) {
if v, ok := value.(string); ok {
value, _, err = sqlparser.FetchBindVar(v, bindVars)
if err != nil {
return result, NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "%v", err)
}
}
result, err = sqltypes.BuildConverted(col.Type, value)
if err != nil {
return result, NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "%v", err)
}
if err = validateValue(col, result); err != nil {
return result, err
}
return result, nil
}
func validateRow(tableInfo *TableInfo, columnNumbers []int, row []sqltypes.Value) error {
if len(row) != len(columnNumbers) {
return NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "data inconsistency %d vs %d", len(row), len(columnNumbers))
}
for j, value := range row {
if err := validateValue(&tableInfo.Columns[columnNumbers[j]], value); err != nil {
return err
}
}
return nil
}
func validateValue(col *schema.TableColumn, value sqltypes.Value) error {
if value.IsNull() {
return nil
}
if sqltypes.IsIntegral(col.Type) {
if !value.IsIntegral() {
return NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "type mismatch, expecting numeric type for %v for column: %v", value, col)
}
} else if col.Type == sqltypes.VarBinary {
if !value.IsQuoted() {
return NewTabletError(vtrpcpb.ErrorCode_BAD_INPUT, "type mismatch, expecting string type for %v for column: %v", value, col)
}
}
return nil
}
func buildStreamComment(tableInfo *TableInfo, pkValueList [][]sqltypes.Value, secondaryList [][]sqltypes.Value) []byte {
buf := bytes.NewBuffer(make([]byte, 0, 256))
fmt.Fprintf(buf, " /* _stream %s (", tableInfo.Name)
// We assume the first index exists, and is the pk
for _, pkName := range tableInfo.Indexes[0].Columns {
buf.WriteString(pkName.Original())
buf.WriteString(" ")
}
buf.WriteString(")")
buildPKValueList(buf, tableInfo, pkValueList)
buildPKValueList(buf, tableInfo, secondaryList)
buf.WriteString("; */")
return buf.Bytes()
}
func buildPKValueList(buf *bytes.Buffer, tableInfo *TableInfo, pkValueList [][]sqltypes.Value) {
for _, pkValues := range pkValueList {
buf.WriteString(" (")
for _, pkValue := range pkValues {
pkValue.EncodeASCII(buf)
buf.WriteString(" ")
}
buf.WriteString(")")
}
}
func applyFilterWithPKDefaults(tableInfo *TableInfo, columnNumbers []int, input []sqltypes.Value) (output []sqltypes.Value) {
output = make([]sqltypes.Value, len(columnNumbers))
for colIndex, colPointer := range columnNumbers {
if colPointer >= 0 {
output[colIndex] = input[colPointer]
} else {
output[colIndex] = tableInfo.GetPKColumn(colIndex).Default
}
}
return output
}
// unicoded returns a valid UTF-8 string that json won't reject
func unicoded(in string) (out string) {
for i, v := range in {
if v == 0xFFFD {
return in[:i]
}
}
return in
}