terminal.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 services

import (
	"context"
	"errors"
	"fmt"

	"vitess.io/vitess/go/vt/vtgate/vtgateservice"

	"vitess.io/vitess/go/sqltypes"
	"vitess.io/vitess/go/tb"
	"vitess.io/vitess/go/vt/log"

	binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
	querypb "vitess.io/vitess/go/vt/proto/query"
	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
	vtgatepb "vitess.io/vitess/go/vt/proto/vtgate"
)

var errTerminal = errors.New("vtgate test client, errTerminal")

// terminalClient implements vtgateservice.VTGateService.
// It is the last client in the chain, and returns a well known error.
type terminalClient struct{}

func newTerminalClient() *terminalClient {
	return &terminalClient{}
}

func (c *terminalClient) Execute(ctx context.Context, mysqlCtx vtgateservice.MySQLConnection, session *vtgatepb.Session, sql string, bindVariables map[string]*querypb.BindVariable) (*vtgatepb.Session, *sqltypes.Result, error) {
	if sql == "quit://" {
		log.Fatal("Received quit:// query. Going down.")
	}
	return session, nil, errTerminal
}

func (c *terminalClient) ExecuteBatch(ctx context.Context, session *vtgatepb.Session, sqlList []string, bindVariablesList []map[string]*querypb.BindVariable) (*vtgatepb.Session, []sqltypes.QueryResponse, error) {
	if len(sqlList) == 1 {
		if sqlList[0] == "quit://" {
			log.Fatal("Received quit:// query. Going down.")
		}
	}
	return session, nil, errTerminal
}

func (c *terminalClient) StreamExecute(ctx context.Context, mysqlCtx vtgateservice.MySQLConnection, session *vtgatepb.Session, sql string, bindVariables map[string]*querypb.BindVariable, callback func(*sqltypes.Result) error) (*vtgatepb.Session, error) {
	return session, errTerminal
}

func (c *terminalClient) Prepare(ctx context.Context, session *vtgatepb.Session, sql string, bindVariables map[string]*querypb.BindVariable) (*vtgatepb.Session, []*querypb.Field, error) {
	return session, nil, errTerminal
}

func (c *terminalClient) CloseSession(ctx context.Context, session *vtgatepb.Session) error {
	return errTerminal
}

func (c *terminalClient) ResolveTransaction(ctx context.Context, dtid string) error {
	return errTerminal
}

func (c *terminalClient) VStream(ctx context.Context, tabletType topodatapb.TabletType, vgtid *binlogdatapb.VGtid, filter *binlogdatapb.Filter, flags *vtgatepb.VStreamFlags, send func([]*binlogdatapb.VEvent) error) error {
	return errTerminal
}

func (c *terminalClient) HandlePanic(err *error) {
	if x := recover(); x != nil {
		log.Errorf("Uncaught panic:\n%v\n%s", x, tb.Stack(4))
		*err = fmt.Errorf("uncaught panic: %v", x)
	}
}