tidb copr_handler 源码
tidb copr_handler 代码
文件路径：/store/mockstore/mockcopr/copr_handler.go
// Copyright 2021 PingCAP, 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 mockcopr
import (
"context"
"github.com/pingcap/errors"
"github.com/pingcap/kvproto/pkg/coprocessor"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tipb/go-tipb"
"github.com/tikv/client-go/v2/testutils"
)
type coprHandler struct {
*testutils.RPCSession
}
func (h coprHandler) handleBatchCopRequest(ctx context.Context, req *coprocessor.BatchRequest) (*mockBatchCopDataClient, error) {
client := &mockBatchCopDataClient{}
for _, ri := range req.Regions {
cop := coprocessor.Request{
Tp: kv.ReqTypeDAG,
Data: req.Data,
StartTs: req.StartTs,
Ranges: ri.Ranges,
}
_, exec, dagReq, err := h.buildDAGExecutor(&cop)
if err != nil {
return nil, errors.Trace(err)
}
chunk, err := drainRowsFromExecutor(ctx, exec, dagReq)
if err != nil {
return nil, errors.Trace(err)
}
client.chunks = append(client.chunks, chunk)
}
return client, nil
}
func drainRowsFromExecutor(ctx context.Context, e executor, req *tipb.DAGRequest) (tipb.Chunk, error) {
var chunk tipb.Chunk
for {
row, err := e.Next(ctx)
if err != nil {
return chunk, errors.Trace(err)
}
if row == nil {
return chunk, nil
}
for _, offset := range req.OutputOffsets {
chunk.RowsData = append(chunk.RowsData, row[offset]...)
}
}
}
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