shard_route.go

/*
Copyright 2020 The Vitess Authors.

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 engine

import (
	"context"

	"vitess.io/vitess/go/sqltypes"
	querypb "vitess.io/vitess/go/vt/proto/query"
	"vitess.io/vitess/go/vt/srvtopo"
	"vitess.io/vitess/go/vt/vterrors"
)

var _ StreamExecutor = (*shardRoute)(nil)

// shardRoute is an internal primitive used by Route
// for performing merge sorts.
type shardRoute struct {
	query     string
	rs        *srvtopo.ResolvedShard
	bv        map[string]*querypb.BindVariable
	primitive Primitive
}

// StreamExecute performs a streaming exec.
func (sr *shardRoute) StreamExecute(ctx context.Context, vcursor VCursor, _ map[string]*querypb.BindVariable, _ bool, callback func(*sqltypes.Result) error) error {
	// TODO rollback on error and autocommit should probably not be used like this
	errors := vcursor.StreamExecuteMulti(ctx, sr.primitive, sr.query, []*srvtopo.ResolvedShard{sr.rs}, []map[string]*querypb.BindVariable{sr.bv}, false /* rollbackOnError */, false /* autocommit */, callback)
	return vterrors.Aggregate(errors)
}