wehub-resource-sync
101 lines
2.1 KiB
Go
101 lines
2.1 KiB
Go
// Copyright 2022 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mvdata
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import (
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"context"
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"io"
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"github.com/dolthub/go-mysql-server/sql"
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"golang.org/x/sync/errgroup"
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"github.com/dolthub/dolt/go/libraries/doltcore/table"
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)
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// DataMoverPipeline is an errgroup based pipeline that reads rows from a reader and writes them to a destination with
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// a writer.
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type DataMoverPipeline struct {
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g *errgroup.Group
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ctx context.Context
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sqlCtx *sql.Context
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rd table.SqlRowReader
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wr table.SqlRowWriter
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}
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func NewDataMoverPipeline(sqlCtx *sql.Context, rd table.SqlRowReader, wr table.SqlRowWriter) *DataMoverPipeline {
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g, ctx := errgroup.WithContext(sqlCtx)
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return &DataMoverPipeline{
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g: g,
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ctx: ctx,
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sqlCtx: sqlCtx,
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rd: rd,
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wr: wr,
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}
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}
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func (e *DataMoverPipeline) Execute() error {
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parsedRowChan := make(chan sql.Row)
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e.g.Go(func() (err error) {
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defer func() {
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close(parsedRowChan)
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if cerr := e.rd.Close(e.ctx); cerr != nil {
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err = cerr
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}
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}()
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for {
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row, err := e.rd.ReadSqlRow(e.ctx)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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select {
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case <-e.ctx.Done():
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return e.ctx.Err()
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case parsedRowChan <- row:
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}
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}
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})
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e.g.Go(func() (err error) {
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defer func() {
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if cerr := e.wr.Close(e.ctx); cerr != nil {
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err = cerr
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}
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}()
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for r := range parsedRowChan {
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select {
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case <-e.ctx.Done():
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return e.ctx.Err()
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default:
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err := e.wr.WriteSqlRow(e.sqlCtx, r)
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if err != nil {
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return err
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}
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}
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}
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return nil
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})
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return e.g.Wait()
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}
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