fake_dbclient.go

/*
Copyright 2019 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 binlogplayer

import (
	"fmt"
	"strings"

	"vitess.io/vitess/go/sqltypes"
)

type fakeDBClient struct {
}

// NewFakeDBClient returns a fake DBClient. Its functions return
// preset responses to requests.
func NewFakeDBClient() DBClient {
	return &fakeDBClient{}
}

func (dc *fakeDBClient) DBName() string {
	return "db"
}

func (dc *fakeDBClient) Connect() error {
	return nil
}

func (dc *fakeDBClient) Begin() error {
	return nil
}

func (dc *fakeDBClient) Commit() error {
	return nil
}

func (dc *fakeDBClient) Rollback() error {
	return nil
}

func (dc *fakeDBClient) Close() {
}

func (dc *fakeDBClient) ExecuteFetch(query string, maxrows int) (qr *sqltypes.Result, err error) {
	query = strings.ToLower(query)
	switch {
	case strings.HasPrefix(query, "insert"):
		return &sqltypes.Result{InsertID: 1}, nil
	case strings.HasPrefix(query, "update"):
		return &sqltypes.Result{RowsAffected: 1}, nil
	case strings.HasPrefix(query, "delete"):
		return &sqltypes.Result{RowsAffected: 1}, nil
	case strings.HasPrefix(query, "select"):
		if strings.Contains(query, "where") {
			return sqltypes.MakeTestResult(
				sqltypes.MakeTestFields(
					"id|state|source|message",
					"int64|varchar|varchar|varchar",
				),
				`1|Running|keyspace:"ks" shard:"0" key_range:<end:"\200" > |`,
			), nil
		}
		return &sqltypes.Result{}, nil
	case strings.HasPrefix(query, "use"):
		return &sqltypes.Result{}, nil
	}
	return nil, fmt.Errorf("unexpected: %v", query)
}