/
replace.go
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/
replace.go
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// Copyright 2023 Greenmask
//
// 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 transformers
import (
"context"
"fmt"
"github.com/greenmaskio/greenmask/internal/db/postgres/transformers/utils"
"github.com/greenmaskio/greenmask/pkg/toolkit"
)
var ReplaceTransformerDefinition = utils.NewDefinition(
utils.NewTransformerProperties(
"Replace",
"Replace column value to the provided",
),
NewReplaceTransformer,
toolkit.MustNewParameter(
"column",
"column name",
).SetIsColumn(toolkit.NewColumnProperties().
SetAffected(true),
).SetRequired(true),
toolkit.MustNewParameter(
"value",
"value to replace",
).SetRequired(true).
SetLinkParameter("column"),
toolkit.MustNewParameter(
"keep_null",
"indicates that NULL values must not be replaced with transformed values",
).SetDefaultValue(toolkit.ParamsValue("true")),
toolkit.MustNewParameter(
"validate",
"validate the value via driver decoding procedure",
).SetDefaultValue(toolkit.ParamsValue("true")),
)
type ReplaceTransformer struct {
columnName string
columnIdx int
keepNull bool
value any
rawValue *toolkit.RawValue
affectedColumns map[int]string
}
func NewReplaceTransformer(ctx context.Context, driver *toolkit.Driver, parameters map[string]*toolkit.Parameter) (utils.Transformer, toolkit.ValidationWarnings, error) {
var columnName string
var keepNull, validate bool
p := parameters["column"]
if _, err := p.Scan(&columnName); err != nil {
return nil, nil, fmt.Errorf(`unable to scan "column" param: %w`, err)
}
idx, c, ok := driver.GetColumnByName(columnName)
if !ok {
return nil, nil, fmt.Errorf(`column with name "%s" is not found`, columnName)
}
affectedColumns := make(map[int]string)
affectedColumns[idx] = columnName
p = parameters["validate"]
if _, err := p.Scan(&validate); err != nil {
return nil, nil, fmt.Errorf(`unable to scan "validate" param: %w`, err)
}
value := parameters["value"].RawValue()
if validate {
_, err := driver.DecodeValueByTypeOid(uint32(c.TypeOid), value)
if err != nil {
return nil, toolkit.ValidationWarnings{
toolkit.NewValidationWarning().
SetSeverity(toolkit.ErrorValidationSeverity).
SetMsg("error decoding \"value\" parameter from raw string to type").
AddMeta("TypeName", c.TypeName).
AddMeta("ParameterName", "value").
AddMeta("ParameterValue", string(value)).
AddMeta("Error", err.Error()),
}, nil
}
}
p = parameters["keep_null"]
if _, err := p.Scan(&keepNull); err != nil {
return nil, nil, fmt.Errorf(`unable to scan "keep_null" param: %w`, err)
}
return &ReplaceTransformer{
columnName: columnName,
keepNull: keepNull,
value: value,
affectedColumns: affectedColumns,
rawValue: toolkit.NewRawValue(value, false),
columnIdx: idx,
}, nil, nil
}
func (rt *ReplaceTransformer) GetAffectedColumns() map[int]string {
return rt.affectedColumns
}
func (rt *ReplaceTransformer) Init(ctx context.Context) error {
return nil
}
func (rt *ReplaceTransformer) Done(ctx context.Context) error {
return nil
}
func (rt *ReplaceTransformer) Transform(ctx context.Context, r *toolkit.Record) (*toolkit.Record, error) {
val, err := r.GetRawColumnValueByIdx(rt.columnIdx)
if err != nil {
return nil, fmt.Errorf("unable to scan value: %w", err)
}
if val.IsNull && rt.keepNull {
return r, nil
}
if err := r.SetRawColumnValueByIdx(rt.columnIdx, rt.rawValue); err != nil {
return nil, fmt.Errorf("unable to set new value: %w", err)
}
return r, nil
}
func init() {
utils.DefaultTransformerRegistry.MustRegister(ReplaceTransformerDefinition)
}