vitess.io/vitess@v0.16.2/go/vt/vttablet/tabletconntest/fakequeryservice.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 tabletconntest

import (
	"context"
	"errors"
	"fmt"
	"testing"

	"vitess.io/vitess/go/vt/vttablet/queryservice"

	"google.golang.org/protobuf/proto"

	"vitess.io/vitess/go/sqltypes"
	"vitess.io/vitess/go/vt/callerid"

	binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
	querypb "vitess.io/vitess/go/vt/proto/query"
	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
	vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
)

// FakeQueryService implements a programmable fake for the query service
// server side.
type FakeQueryService struct {
	t              testing.TB
	TestingGateway bool

	// these fields are used to simulate and synchronize on errors
	HasError        bool
	HasBeginError   bool
	HasReserveError bool
	TabletError     error
	ErrorWait       chan struct{}

	// these fields are used to simulate and synchronize on panics
	Panics                   bool
	StreamExecutePanicsEarly bool
	PanicWait                chan struct{}

	// ExpectedTransactionID is what transactionID to expect for Execute
	ExpectedTransactionID int64

	// StreamHealthResponse is what we return for StreamHealth.
	// If not set, return TestStreamHealthStreamHealthResponse
	StreamHealthResponse *querypb.StreamHealthResponse
}

var _ queryservice.QueryService = (*FakeQueryService)(nil)

// Close is a no-op.
func (f *FakeQueryService) Close(ctx context.Context) error {
	return nil
}

// HandlePanic is part of the queryservice.QueryService interface
func (f *FakeQueryService) HandlePanic(err *error) {
	if x := recover(); x != nil {
		*err = fmt.Errorf("caught test panic: %v", x)
	}
}

// TestTarget is the target we use for this test
var TestTarget = &querypb.Target{
	Keyspace:   "test_keyspace",
	Shard:      "test_shard",
	TabletType: topodatapb.TabletType_REPLICA,
}

// TestCell is the cell we use for this test (and TestGRPCDiscovery)
var TestCell = "aa"

// TestAlias is the tablet alias we use for this test (and TestGRPCDiscovery)
var TestAlias = &topodatapb.TabletAlias{
	Cell: TestCell,
	Uid:  1,
}

// TestCallerID is a test caller id.
var TestCallerID = &vtrpcpb.CallerID{
	Principal:    "test_principal",
	Component:    "test_component",
	Subcomponent: "test_subcomponent",
}

// TestVTGateCallerID is a test vtgate caller id.
var TestVTGateCallerID = &querypb.VTGateCallerID{
	Username: "test_username",
}

// TestExecuteOptions is a test execute options.
var TestExecuteOptions = &querypb.ExecuteOptions{
	IncludedFields:  querypb.ExecuteOptions_TYPE_ONLY,
	ClientFoundRows: true,
}

// TestAsTransaction is a test 'asTransaction' flag.
const TestAsTransaction bool = true

func (f *FakeQueryService) checkTargetCallerID(ctx context.Context, name string, target *querypb.Target) {
	if !proto.Equal(target, TestTarget) {
		f.t.Errorf("invalid Target for %v: got %#v expected %#v", name, target, TestTarget)
	}

	ef := callerid.EffectiveCallerIDFromContext(ctx)
	if ef == nil {
		f.t.Errorf("no effective caller id for %v", name)
	} else {
		if !proto.Equal(ef, TestCallerID) {
			f.t.Errorf("invalid effective caller id for %v: got %v expected %v", name, ef, TestCallerID)
		}
	}

	im := callerid.ImmediateCallerIDFromContext(ctx)
	if im == nil {
		f.t.Errorf("no immediate caller id for %v", name)
	} else {
		if !proto.Equal(im, TestVTGateCallerID) {
			f.t.Errorf("invalid immediate caller id for %v: got %v expected %v", name, im, TestVTGateCallerID)
		}
	}
}

// beginTransactionID is a test transaction id for Begin.
const beginTransactionID int64 = 9990

// Begin is part of the queryservice.QueryService interface
func (f *FakeQueryService) Begin(ctx context.Context, target *querypb.Target, options *querypb.ExecuteOptions) (queryservice.TransactionState, error) {
	if f.HasBeginError {
		return queryservice.TransactionState{}, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "Begin", target)
	if !proto.Equal(options, TestExecuteOptions) {
		f.t.Errorf("invalid Execute.ExecuteOptions: got %v expected %v", options, TestExecuteOptions)
	}
	return queryservice.TransactionState{TransactionID: beginTransactionID, TabletAlias: TestAlias}, nil
}

// commitTransactionID is a test transaction id for Commit.
const commitTransactionID int64 = 999044

// Commit is part of the queryservice.QueryService interface
func (f *FakeQueryService) Commit(ctx context.Context, target *querypb.Target, transactionID int64) (int64, error) {
	if f.HasError {
		return 0, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "Commit", target)
	if transactionID != commitTransactionID {
		f.t.Errorf("Commit: invalid TransactionId: got %v expected %v", transactionID, commitTransactionID)
	}
	return 0, nil
}

// rollbackTransactionID is a test transactin id for Rollback.
const rollbackTransactionID int64 = 999044

// Rollback is part of the queryservice.QueryService interface
func (f *FakeQueryService) Rollback(ctx context.Context, target *querypb.Target, transactionID int64) (int64, error) {
	if f.HasError {
		return 0, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "Rollback", target)
	if transactionID != rollbackTransactionID {
		f.t.Errorf("Rollback: invalid TransactionId: got %v expected %v", transactionID, rollbackTransactionID)
	}
	return 0, nil
}

// Dtid is a test dtid
const Dtid string = "aa"

// Prepare is part of the queryservice.QueryService interface
func (f *FakeQueryService) Prepare(ctx context.Context, target *querypb.Target, transactionID int64, dtid string) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "Prepare", target)
	if transactionID != commitTransactionID {
		f.t.Errorf("Prepare: invalid TransactionID: got %v expected %v", transactionID, commitTransactionID)
	}
	if dtid != Dtid {
		f.t.Errorf("Prepare: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// CommitPrepared is part of the queryservice.QueryService interface
func (f *FakeQueryService) CommitPrepared(ctx context.Context, target *querypb.Target, dtid string) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "CommitPrepared", target)
	if dtid != Dtid {
		f.t.Errorf("CommitPrepared: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// RollbackPrepared is part of the queryservice.QueryService interface
func (f *FakeQueryService) RollbackPrepared(ctx context.Context, target *querypb.Target, dtid string, originalID int64) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "RollbackPrepared", target)
	if originalID != rollbackTransactionID {
		f.t.Errorf("RollbackPrepared: invalid TransactionID: got %v expected %v", originalID, rollbackTransactionID)
	}
	if dtid != Dtid {
		f.t.Errorf("RollbackPrepared: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// Participants is a test list of 2pc participants.
var Participants = []*querypb.Target{{
	Keyspace: "ks0",
	Shard:    "0",
}, {
	Keyspace: "ks1",
	Shard:    "1",
}}

// TargetsEqual returns true if the targets are equal.
func TargetsEqual(t1, t2 []*querypb.Target) bool {
	if len(t1) != len(t2) {
		return false
	}
	for i, t := range t1 {
		if !proto.Equal(t, t2[i]) {
			return false
		}
	}
	return true
}

// CreateTransaction is part of the queryservice.QueryService interface
func (f *FakeQueryService) CreateTransaction(ctx context.Context, target *querypb.Target, dtid string, participants []*querypb.Target) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "CreateTransaction", target)
	if dtid != Dtid {
		f.t.Errorf("CreateTransaction: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	if !TargetsEqual(participants, Participants) {
		f.t.Errorf("invalid CreateTransaction participants: got %v, expected %v", participants, Participants)
	}
	return nil
}

// StartCommit is part of the queryservice.QueryService interface
func (f *FakeQueryService) StartCommit(ctx context.Context, target *querypb.Target, transactionID int64, dtid string) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "StartCommit", target)
	if transactionID != commitTransactionID {
		f.t.Errorf("StartCommit: invalid TransactionID: got %v expected %v", transactionID, commitTransactionID)
	}
	if dtid != Dtid {
		f.t.Errorf("StartCommit: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// SetRollback is part of the queryservice.QueryService interface
func (f *FakeQueryService) SetRollback(ctx context.Context, target *querypb.Target, dtid string, transactionID int64) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "SetRollback", target)
	if transactionID != commitTransactionID {
		f.t.Errorf("SetRollback: invalid TransactionID: got %v expected %v", transactionID, commitTransactionID)
	}
	if dtid != Dtid {
		f.t.Errorf("SetRollback: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// ConcludeTransaction is part of the queryservice.QueryService interface
func (f *FakeQueryService) ConcludeTransaction(ctx context.Context, target *querypb.Target, dtid string) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "ConcludeTransaction", target)
	if dtid != Dtid {
		f.t.Errorf("ConcludeTransaction: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return nil
}

// Metadata is a test metadata for 2pc transactions.
var Metadata = &querypb.TransactionMetadata{
	Dtid:         "aa",
	State:        querypb.TransactionState_PREPARE,
	TimeCreated:  1,
	Participants: Participants,
}

// ReadTransaction is part of the queryservice.QueryService interface
func (f *FakeQueryService) ReadTransaction(ctx context.Context, target *querypb.Target, dtid string) (metadata *querypb.TransactionMetadata, err error) {
	if f.HasError {
		return nil, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	f.checkTargetCallerID(ctx, "ReadTransaction", target)
	if dtid != Dtid {
		f.t.Errorf("ReadTransaction: invalid dtid: got %s expected %s", dtid, Dtid)
	}
	return Metadata, nil
}

// ExecuteQuery is a fake test query.
const ExecuteQuery = "executeQuery"

// ExecuteBindVars is a test bind var.
var ExecuteBindVars = map[string]*querypb.BindVariable{
	"bind1": sqltypes.Int64BindVariable(1114444),
}

// ExecuteTransactionID is a test transaction id.
const ExecuteTransactionID int64 = 678

// ReserveConnectionID is a test reserved connection id.
const ReserveConnectionID int64 = 933

// ExecuteQueryResult is a test query result.
var ExecuteQueryResult = sqltypes.Result{
	Fields: []*querypb.Field{
		{
			Name: "field1",
			Type: sqltypes.Int8,
		},
		{
			Name: "field2",
			Type: sqltypes.Char,
		},
	},
	RowsAffected: 123,
	InsertID:     72,
	Rows: [][]sqltypes.Value{
		{
			sqltypes.TestValue(sqltypes.Int8, "1"),
			sqltypes.NULL,
		},
		{
			sqltypes.TestValue(sqltypes.Int8, "2"),
			sqltypes.TestValue(sqltypes.Char, "row2 value2"),
		},
	},
}

// Execute is part of the queryservice.QueryService interface
func (f *FakeQueryService) Execute(ctx context.Context, target *querypb.Target, sql string, bindVariables map[string]*querypb.BindVariable, transactionID, reservedID int64, options *querypb.ExecuteOptions) (*sqltypes.Result, error) {
	if f.HasError {
		return nil, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	if sql != ExecuteQuery {
		f.t.Errorf("invalid Execute.Query.Sql: got %v expected %v", sql, ExecuteQuery)
	}
	if !sqltypes.BindVariablesEqual(bindVariables, ExecuteBindVars) {
		f.t.Errorf("invalid Execute.BindVariables: got %v expected %v", bindVariables, ExecuteBindVars)
	}
	if !proto.Equal(options, TestExecuteOptions) {
		f.t.Errorf("invalid Execute.ExecuteOptions: got %v expected %v", options, TestExecuteOptions)
	}
	f.checkTargetCallerID(ctx, "Execute", target)
	if transactionID != f.ExpectedTransactionID {
		f.t.Errorf("invalid Execute.TransactionId: got %v expected %v", transactionID, f.ExpectedTransactionID)
	}
	return &ExecuteQueryResult, nil
}

// StreamExecuteQuery is a fake test query for streaming.
const StreamExecuteQuery = "streamExecuteQuery"

// StreamExecuteBindVars is a test bind var for streaming.
var StreamExecuteBindVars = map[string]*querypb.BindVariable{
	"bind1": sqltypes.Int64BindVariable(93848000),
}

// StreamExecuteQueryResult1 is the first packet of a streaming result.
var StreamExecuteQueryResult1 = sqltypes.Result{
	Fields: []*querypb.Field{
		{
			Name: "field1",
			Type: sqltypes.Int8,
		},
		{
			Name: "field2",
			Type: sqltypes.Char,
		},
	},
}

// StreamExecuteQueryResult2 is the second packet of a streaming result.
var StreamExecuteQueryResult2 = sqltypes.Result{
	Rows: [][]sqltypes.Value{
		{
			sqltypes.TestValue(sqltypes.Int8, "1"),
			sqltypes.TestValue(sqltypes.Char, "row1 value2"),
		},
		{
			sqltypes.TestValue(sqltypes.Int8, "2"),
			sqltypes.TestValue(sqltypes.Char, "row2 value2"),
		},
	},
}

// StreamExecute is part of the queryservice.QueryService interface
func (f *FakeQueryService) StreamExecute(ctx context.Context, target *querypb.Target, sql string, bindVariables map[string]*querypb.BindVariable, transactionID int64, reservedID int64, options *querypb.ExecuteOptions, callback func(*sqltypes.Result) error) error {
	if f.Panics && f.StreamExecutePanicsEarly {
		panic(fmt.Errorf("test-triggered panic early"))
	}
	if sql != StreamExecuteQuery {
		f.t.Errorf("invalid StreamExecute.Sql: got %v expected %v", sql, StreamExecuteQuery)
	}
	if !sqltypes.BindVariablesEqual(bindVariables, StreamExecuteBindVars) {
		f.t.Errorf("invalid StreamExecute.BindVariables: got %v expected %v", bindVariables, StreamExecuteBindVars)
	}
	if !proto.Equal(options, TestExecuteOptions) {
		f.t.Errorf("invalid StreamExecute.ExecuteOptions: got %v expected %v", options, TestExecuteOptions)
	}
	f.checkTargetCallerID(ctx, "StreamExecute", target)
	if err := callback(&StreamExecuteQueryResult1); err != nil {
		f.t.Errorf("callback1 failed: %v", err)
	}
	if f.Panics && !f.StreamExecutePanicsEarly {
		// wait until the client gets the response, then panics
		<-f.PanicWait
		panic(fmt.Errorf("test-triggered panic late"))
	}
	if f.HasError {
		// wait until the client has the response, since all
		// streaming implementation may not send previous
		// messages if an error has been triggered.
		<-f.ErrorWait
		return f.TabletError
	}
	if err := callback(&StreamExecuteQueryResult2); err != nil {
		f.t.Errorf("callback2 failed: %v", err)
	}
	return nil
}

// ExecuteBatchQueries are test queries for batch.
var ExecuteBatchQueries = []*querypb.BoundQuery{
	{
		Sql: "executeBatchQueries1",
		BindVariables: map[string]*querypb.BindVariable{
			"bind1": sqltypes.Int64BindVariable(43),
		},
	},
	{
		Sql: "executeBatchQueries2",
		BindVariables: map[string]*querypb.BindVariable{
			"bind2": sqltypes.Int64BindVariable(72),
		},
	},
}

// ExecuteBatchTransactionID is a test transaction id for batch.
const ExecuteBatchTransactionID int64 = 678

// ExecuteBatchQueryResultList is a list of test query results.
var ExecuteBatchQueryResultList = []sqltypes.Result{
	{
		Fields: []*querypb.Field{
			{
				Name: "field1",
				Type: sqltypes.Int8,
			},
		},
		RowsAffected: 1232,
		InsertID:     712,
		Rows: [][]sqltypes.Value{
			{
				sqltypes.TestValue(sqltypes.Int8, "1"),
			},
			{
				sqltypes.TestValue(sqltypes.Int8, "2"),
			},
		},
	},
	{
		Fields: []*querypb.Field{
			{
				Name: "field1",
				Type: sqltypes.VarBinary,
			},
		},
		RowsAffected: 12333,
		InsertID:     74442,
		Rows: [][]sqltypes.Value{
			{
				sqltypes.NewVarBinary("row1 value1"),
			},
			{
				sqltypes.NewVarBinary("row1 value2"),
			},
		},
	},
}

// BeginExecute combines Begin and Execute.
func (f *FakeQueryService) BeginExecute(ctx context.Context, target *querypb.Target, _ []string, sql string, bindVariables map[string]*querypb.BindVariable, reservedID int64, options *querypb.ExecuteOptions) (queryservice.TransactionState, *sqltypes.Result, error) {
	state, err := f.Begin(ctx, target, options)
	if err != nil {
		return state, nil, err
	}

	// TODO(deepthi): what alias should we actually return here?
	result, err := f.Execute(ctx, target, sql, bindVariables, state.TransactionID, reservedID, options)
	return state, result, err
}

// BeginStreamExecute combines Begin and StreamExecute.
func (f *FakeQueryService) BeginStreamExecute(ctx context.Context, target *querypb.Target, preQueries []string, sql string, bindVariables map[string]*querypb.BindVariable, reservedID int64, options *querypb.ExecuteOptions, callback func(*sqltypes.Result) error) (queryservice.TransactionState, error) {
	state, err := f.Begin(ctx, target, options)
	if err != nil {
		return state, err
	}

	for _, preQuery := range preQueries {
		_, err := f.Execute(ctx, target, preQuery, nil, state.TransactionID, reservedID, options)
		if err != nil {
			return state, err
		}
	}

	err = f.StreamExecute(ctx, target, sql, bindVariables, state.TransactionID, reservedID, options, callback)
	return state, err
}

var (
	// MessageName is a test message name.
	MessageName = "vitess_message"

	// MessageStreamResult is a test stream result.
	MessageStreamResult = &sqltypes.Result{
		Fields: []*querypb.Field{{
			Name: "id",
			Type: sqltypes.VarBinary,
		}, {
			Name: "message",
			Type: sqltypes.VarBinary,
		}},
		Rows: [][]sqltypes.Value{{
			sqltypes.NewVarBinary("1"),
			sqltypes.NewVarBinary("row1 value2"),
		}, {
			sqltypes.NewVarBinary("2"),
			sqltypes.NewVarBinary("row2 value2"),
		}},
	}

	// MessageIDs is a test list of message ids.
	MessageIDs = []*querypb.Value{{
		Type:  sqltypes.VarChar,
		Value: []byte("1"),
	}}
)

// MessageStream is part of the queryservice.QueryService interface
func (f *FakeQueryService) MessageStream(ctx context.Context, target *querypb.Target, name string, callback func(*sqltypes.Result) error) (err error) {
	if f.HasError {
		return f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	if name != MessageName {
		f.t.Errorf("name: %s, want %s", name, MessageName)
	}
	if err := callback(MessageStreamResult); err != nil {
		f.t.Logf("MessageStream callback failed: %v", err)
	}
	return nil
}

// MessageAck is part of the queryservice.QueryService interface
func (f *FakeQueryService) MessageAck(ctx context.Context, target *querypb.Target, name string, ids []*querypb.Value) (count int64, err error) {
	if f.HasError {
		return 0, f.TabletError
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	if name != MessageName {
		f.t.Errorf("name: %s, want %s", name, MessageName)
	}
	if !sqltypes.Proto3ValuesEqual(ids, MessageIDs) {
		f.t.Errorf("ids: %v, want %v", ids, MessageIDs)
	}
	return 1, nil
}

// TestStreamHealthStreamHealthResponse is a test stream health response.
var TestStreamHealthStreamHealthResponse = &querypb.StreamHealthResponse{
	Target: &querypb.Target{
		Keyspace:   "test_keyspace",
		Shard:      "test_shard",
		TabletType: topodatapb.TabletType_RDONLY,
	},
	Serving: true,

	TabletExternallyReparentedTimestamp: 1234589,

	RealtimeStats: &querypb.RealtimeStats{
		CpuUsage:                      1.0,
		HealthError:                   "random error",
		ReplicationLagSeconds:         234,
		BinlogPlayersCount:            1,
		FilteredReplicationLagSeconds: 2,
	},
}

// TestStreamHealthErrorMsg is a test error message for health streaming.
var TestStreamHealthErrorMsg = "to trigger a server error"

// StreamHealth is part of the queryservice.QueryService interface
func (f *FakeQueryService) StreamHealth(ctx context.Context, callback func(*querypb.StreamHealthResponse) error) error {
	if f.HasError {
		return errors.New(TestStreamHealthErrorMsg)
	}
	if f.Panics {
		panic(fmt.Errorf("test-triggered panic"))
	}
	shr := f.StreamHealthResponse
	if shr == nil {
		shr = TestStreamHealthStreamHealthResponse
	}
	if err := callback(shr); err != nil {
		f.t.Logf("StreamHealth callback failed: %v", err)
	}
	return nil
}

// VStream is part of the queryservice.QueryService interface
func (f *FakeQueryService) VStream(ctx context.Context, request *binlogdatapb.VStreamRequest, send func([]*binlogdatapb.VEvent) error) error {
	panic("not implemented")
}

// VStreamRows is part of the QueryService interface.
func (f *FakeQueryService) VStreamRows(ctx context.Context, request *binlogdatapb.VStreamRowsRequest, send func(*binlogdatapb.VStreamRowsResponse) error) error {
	panic("not implemented")
}

// VStreamResults is part of the QueryService interface.
func (f *FakeQueryService) VStreamResults(ctx context.Context, target *querypb.Target, query string, send func(*binlogdatapb.VStreamResultsResponse) error) error {
	panic("not implemented")
}

// QueryServiceByAlias satisfies the Gateway interface
func (f *FakeQueryService) QueryServiceByAlias(_ *topodatapb.TabletAlias, _ *querypb.Target) (queryservice.QueryService, error) {
	panic("not implemented")
}

// ReserveBeginExecute satisfies the Gateway interface
func (f *FakeQueryService) ReserveBeginExecute(ctx context.Context, target *querypb.Target, preQueries []string, postBeginQueries []string, sql string, bindVariables map[string]*querypb.BindVariable, options *querypb.ExecuteOptions) (queryservice.ReservedTransactionState, *sqltypes.Result, error) {
	panic("implement me")
}

// ReserveBeginStreamExecute satisfies the Gateway interface
func (f *FakeQueryService) ReserveBeginStreamExecute(ctx context.Context, target *querypb.Target, preQueries []string, postBeginQueries []string, sql string, bindVariables map[string]*querypb.BindVariable, options *querypb.ExecuteOptions, callback func(*sqltypes.Result) error) (queryservice.ReservedTransactionState, error) {
	panic("implement me")
}

// ReserveExecute implements the QueryService interface
func (f *FakeQueryService) ReserveExecute(ctx context.Context, target *querypb.Target, preQueries []string, sql string, bindVariables map[string]*querypb.BindVariable, transactionID int64, options *querypb.ExecuteOptions) (queryservice.ReservedState, *sqltypes.Result, error) {
	panic("implement me")
}

// ReserveStreamExecute satisfies the Gateway interface
func (f *FakeQueryService) ReserveStreamExecute(ctx context.Context, target *querypb.Target, preQueries []string, sql string, bindVariables map[string]*querypb.BindVariable, transactionID int64, options *querypb.ExecuteOptions, callback func(*sqltypes.Result) error) (queryservice.ReservedState, error) {
	state, err := f.reserve(transactionID)
	if err != nil {
		return state, err
	}
	err = f.StreamExecute(ctx, target, sql, bindVariables, transactionID, state.ReservedID, options, callback)
	return state, err
}

func (f *FakeQueryService) reserve(transactionID int64) (queryservice.ReservedState, error) {
	reserveID := transactionID
	if reserveID == 0 {
		reserveID = beginTransactionID
	}
	if f.HasReserveError {
		return queryservice.ReservedState{}, f.TabletError
	}
	state := queryservice.ReservedState{ReservedID: reserveID, TabletAlias: TestAlias}
	return state, nil
}

// Release implements the QueryService interface
func (f *FakeQueryService) Release(ctx context.Context, target *querypb.Target, transactionID, reservedID int64) error {
	panic("implement me")
}

// GetSchema implements the QueryService interface
func (f *FakeQueryService) GetSchema(ctx context.Context, target *querypb.Target, tableType querypb.SchemaTableType, tableNames []string, callback func(schemaRes *querypb.GetSchemaResponse) error) error {
	panic("implement me")
}

// CreateFakeServer returns the fake server for the tests
func CreateFakeServer(t testing.TB) *FakeQueryService {
	return &FakeQueryService{
		t: t,
	}
}