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transformation_window.go
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/
transformation_window.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 dumpers
import (
"context"
"sync"
"golang.org/x/sync/errgroup"
"github.com/greenmaskio/greenmask/internal/db/postgres/entries"
"github.com/greenmaskio/greenmask/internal/db/postgres/transformers/utils"
"github.com/greenmaskio/greenmask/pkg/toolkit"
)
type TransformationWindow struct {
affectedColumns map[string]struct{}
transformers []utils.Transformer
chs []chan struct{}
done chan struct{}
wg *sync.WaitGroup
eg *errgroup.Group
r *toolkit.Record
ctx context.Context
size int
}
func NewTransformationWindow(ctx context.Context, eg *errgroup.Group) *TransformationWindow {
return &TransformationWindow{
affectedColumns: map[string]struct{}{},
done: make(chan struct{}, 1),
wg: &sync.WaitGroup{},
eg: eg,
ctx: ctx,
}
}
func (tw *TransformationWindow) TryAdd(table *entries.Table, t utils.Transformer) bool {
affectedColumn := t.GetAffectedColumns()
if len(affectedColumn) == 0 {
if len(tw.transformers) == 0 {
tw.transformers = append(tw.transformers, t)
for _, c := range table.Columns {
tw.affectedColumns[c.Name] = struct{}{}
}
} else {
return false
}
} else {
for _, name := range affectedColumn {
if _, ok := tw.affectedColumns[name]; ok {
return false
}
}
for _, name := range affectedColumn {
tw.affectedColumns[name] = struct{}{}
}
tw.transformers = append(tw.transformers, t)
}
ch := make(chan struct{}, 1)
tw.chs = append(tw.chs, ch)
tw.size++
return true
}
func (tw *TransformationWindow) Init() {
for idx, t := range tw.transformers {
ch := tw.chs[idx]
func(t utils.Transformer, ch chan struct{}) {
tw.eg.Go(func() error {
for {
select {
case <-tw.ctx.Done():
return tw.ctx.Err()
case <-tw.done:
return nil
case <-ch:
}
_, err := t.Transform(tw.ctx, tw.r)
if err != nil {
tw.wg.Done()
return err
}
tw.wg.Done()
}
})
}(t, ch)
}
}
func (tw *TransformationWindow) Done() {
close(tw.done)
}
func (tw *TransformationWindow) Transform(ctx context.Context, r *toolkit.Record) (*toolkit.Record, error) {
tw.wg.Add(tw.size)
tw.r = r
for _, ch := range tw.chs {
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-tw.ctx.Done():
return nil, tw.ctx.Err()
case ch <- struct{}{}:
}
}
tw.wg.Wait()
return r, nil
}