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server.go
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server.go
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// Copyright 2015, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package grpcqueryservice
import (
"sync"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
mproto "github.com/youtube/vitess/go/mysql/proto"
"github.com/youtube/vitess/go/vt/callerid"
"github.com/youtube/vitess/go/vt/callinfo"
"github.com/youtube/vitess/go/vt/servenv"
"github.com/youtube/vitess/go/vt/tabletserver"
"github.com/youtube/vitess/go/vt/tabletserver/proto"
"github.com/youtube/vitess/go/vt/tabletserver/queryservice"
"golang.org/x/net/context"
pb "github.com/youtube/vitess/go/vt/proto/query"
pbs "github.com/youtube/vitess/go/vt/proto/queryservice"
)
// query is the gRPC query service implementation.
// It implements the queryservice.QueryServer interface.
type query struct {
server queryservice.QueryService
}
// GetSessionId is part of the queryservice.QueryServer interface
func (q *query) GetSessionId(ctx context.Context, request *pb.GetSessionIdRequest) (response *pb.GetSessionIdResponse, err error) {
defer q.server.HandlePanic(&err)
sessionInfo := new(proto.SessionInfo)
if err := q.server.GetSessionId(&proto.SessionParams{
Keyspace: request.Keyspace,
Shard: request.Shard,
}, sessionInfo); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.GetSessionIdResponse{
SessionId: sessionInfo.SessionId,
}, nil
}
// Execute is part of the queryservice.QueryServer interface
func (q *query) Execute(ctx context.Context, request *pb.ExecuteRequest) (response *pb.ExecuteResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
reply := new(mproto.QueryResult)
if err := q.server.Execute(ctx, request.Target, &proto.Query{
Sql: string(request.Query.Sql),
BindVariables: proto.Proto3ToBindVariables(request.Query.BindVariables),
SessionId: request.SessionId,
TransactionId: request.TransactionId,
}, reply); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.ExecuteResponse{
Result: mproto.QueryResultToProto3(reply),
}, nil
}
// ExecuteBatch is part of the queryservice.QueryServer interface
func (q *query) ExecuteBatch(ctx context.Context, request *pb.ExecuteBatchRequest) (response *pb.ExecuteBatchResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
reply := new(proto.QueryResultList)
if err := q.server.ExecuteBatch(ctx, request.Target, &proto.QueryList{
Queries: proto.Proto3ToBoundQueryList(request.Queries),
SessionId: request.SessionId,
AsTransaction: request.AsTransaction,
TransactionId: request.TransactionId,
}, reply); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.ExecuteBatchResponse{
Results: proto.QueryResultListToProto3(reply.List),
}, nil
}
// StreamExecute is part of the queryservice.QueryServer interface
func (q *query) StreamExecute(request *pb.StreamExecuteRequest, stream pbs.Query_StreamExecuteServer) (err error) {
defer q.server.HandlePanic(&err)
ctx := callerid.NewContext(callinfo.GRPCCallInfo(stream.Context()),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
if err := q.server.StreamExecute(ctx, request.Target, &proto.Query{
Sql: string(request.Query.Sql),
BindVariables: proto.Proto3ToBindVariables(request.Query.BindVariables),
SessionId: request.SessionId,
}, func(reply *mproto.QueryResult) error {
return stream.Send(&pb.StreamExecuteResponse{
Result: mproto.QueryResultToProto3(reply),
})
}); err != nil {
return grpc.Errorf(codes.Internal, "%v", err)
}
return nil
}
// Begin is part of the queryservice.QueryServer interface
func (q *query) Begin(ctx context.Context, request *pb.BeginRequest) (response *pb.BeginResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
txInfo := new(proto.TransactionInfo)
if err := q.server.Begin(ctx, request.Target, &proto.Session{
SessionId: request.SessionId,
}, txInfo); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.BeginResponse{
TransactionId: txInfo.TransactionId,
}, nil
}
// Commit is part of the queryservice.QueryServer interface
func (q *query) Commit(ctx context.Context, request *pb.CommitRequest) (response *pb.CommitResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
if err := q.server.Commit(ctx, request.Target, &proto.Session{
SessionId: request.SessionId,
TransactionId: request.TransactionId,
}); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.CommitResponse{}, nil
}
// Rollback is part of the queryservice.QueryServer interface
func (q *query) Rollback(ctx context.Context, request *pb.RollbackRequest) (response *pb.RollbackResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
if err := q.server.Rollback(ctx, request.Target, &proto.Session{
SessionId: request.SessionId,
TransactionId: request.TransactionId,
}); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.RollbackResponse{}, nil
}
// SplitQuery is part of the queryservice.QueryServer interface
func (q *query) SplitQuery(ctx context.Context, request *pb.SplitQueryRequest) (response *pb.SplitQueryResponse, err error) {
defer q.server.HandlePanic(&err)
ctx = callerid.NewContext(callinfo.GRPCCallInfo(ctx),
request.EffectiveCallerId,
request.ImmediateCallerId,
)
reply := &proto.SplitQueryResult{}
if err := q.server.SplitQuery(ctx, request.Target, &proto.SplitQueryRequest{
Query: *proto.Proto3ToBoundQuery(request.Query),
SplitColumn: request.SplitColumn,
SplitCount: int(request.SplitCount),
SessionID: request.SessionId,
}, reply); err != nil {
return nil, grpc.Errorf(codes.Internal, "%v", err)
}
return &pb.SplitQueryResponse{
Queries: proto.QuerySplitsToProto3(reply.Queries),
}, nil
}
// StreamHealth is part of the queryservice.QueryServer interface
func (q *query) StreamHealth(request *pb.StreamHealthRequest, stream pbs.Query_StreamHealthServer) (err error) {
defer q.server.HandlePanic(&err)
c := make(chan *pb.StreamHealthResponse, 10)
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
for shr := range c {
// we send until the client disconnects
if err := stream.Send(shr); err != nil {
return
}
}
}()
id, err := q.server.StreamHealthRegister(c)
if err != nil {
close(c)
wg.Wait()
return err
}
wg.Wait()
return q.server.StreamHealthUnregister(id)
}
func init() {
tabletserver.QueryServiceControlRegisterFunctions = append(tabletserver.QueryServiceControlRegisterFunctions, func(qsc tabletserver.QueryServiceControl) {
if servenv.GRPCCheckServiceMap("queryservice") {
pbs.RegisterQueryServer(servenv.GRPCServer, &query{qsc.QueryService()})
}
})
}
// RegisterForTest should only be used by unit tests
func RegisterForTest(s *grpc.Server, server queryservice.QueryService) {
pbs.RegisterQueryServer(s, &query{server})
}