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lazy_client.go
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lazy_client.go
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package grpcutil
import (
"context"
"sync/atomic"
"github.com/gogo/protobuf/proto"
"google.golang.org/grpc"
)
var (
lazyCodec = NewLazyCodec()
streamids uint64
)
type LazyClient struct {
cc *grpc.ClientConn
}
type LazyMethodDesc struct {
Name string
ClientStreams bool
ServerStreams bool
}
func NewLazyClient(cc *grpc.ClientConn) *LazyClient {
return &LazyClient{cc: cc}
}
func (lc *LazyClient) InvokeUnary(ctx context.Context, desc *LazyMethodDesc, in *LazyMessage, copts ...grpc.CallOption) (out *LazyMessage, err error) {
out = NewLazyMessage()
err = grpc.Invoke(ctx, desc.Name, in, out, lc.cc, append(copts, grpc.ForceCodec(lazyCodec))...)
return
}
func (lc *LazyClient) InvokeStream(ctx context.Context, desc *LazyMethodDesc, in *LazyMessage, copts ...grpc.CallOption) (*LazyStream, error) {
sdesc := &grpc.StreamDesc{
StreamName: desc.Name,
ServerStreams: desc.ServerStreams,
ClientStreams: desc.ClientStreams,
}
sctx, cancel := context.WithCancel(ctx)
cstream, err := grpc.NewClientStream(sctx, sdesc, lc.cc, desc.Name, append(copts, grpc.ForceCodec(lazyCodec))...)
if err != nil {
cancel()
return nil, err
}
if !desc.ClientStreams && desc.ServerStreams {
if err := cstream.SendMsg(in); err != nil {
cancel()
return nil, err
}
if err := cstream.CloseSend(); err != nil {
cancel()
return nil, err
}
}
return &LazyStream{
id: atomic.AddUint64(&streamids, 1),
ClientStream: cstream,
CancelFunc: cancel,
}, nil
}
type LazyStream struct {
// used to close the stream
context.CancelFunc
grpc.ClientStream
id uint64
}
func (s *LazyStream) SendMsg(in proto.Message) (err error) {
if err = s.ClientStream.SendMsg(in); err != nil {
s.CancelFunc()
}
return
}
func (s *LazyStream) RecvMsg(out proto.Message) (err error) {
if err = s.ClientStream.RecvMsg(out); err != nil {
s.CancelFunc()
}
return
}
func (s *LazyStream) Close() (err error) {
err = s.CloseSend()
s.CancelFunc()
return
}
func (s *LazyStream) ID() uint64 {
return s.id
}