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service_grpc.go
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service_grpc.go
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package bertybridge
import (
"context"
"fmt"
"strconv"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"berty.tech/berty/v2/go/internal/grpcutil"
"berty.tech/berty/v2/go/pkg/errcode"
)
// ClientInvokeUnary invoke a unary method
func (s *service) ClientInvokeUnary(ctx context.Context, req *ClientInvokeUnary_Request) (*ClientInvokeUnary_Reply, error) {
client, ok := s.getServiceClient(req.MethodDesc)
if !ok {
return nil, fmt.Errorf("unknow or unregister service: `%s", req.GetMethodDesc().GetName())
}
res := &ClientInvokeUnary_Reply{}
if req.MethodDesc == nil {
return res, fmt.Errorf("cannot invoke `ClientInvokeUnary` without a `MethodDesc``")
}
if req.MethodDesc.IsClientStream || req.MethodDesc.IsServerStream {
return res, fmt.Errorf("cannot call stream method with `ClientInvokeUnary`")
}
// inject header into context
uctx := newOutgoingContext(client.rootCtx, req.GetHeader())
desc := &grpcutil.LazyMethodDesc{
Name: req.MethodDesc.Name,
}
// create fake proto message
trailer := metadata.MD{}
in := grpcutil.NewLazyMessage().FromBytes(req.Payload)
out, err := client.lc.InvokeUnary(uctx, desc, in, grpc.Trailer(&trailer))
res.Error = getServiceError(err)
res.Payload = out.Bytes()
res.Trailer = convertMetadata(trailer)
return res, nil
}
// CreateStream create a stream
func (s *service) CreateClientStream(ctx context.Context, req *ClientCreateStream_Request) (*ClientCreateStream_Reply, error) {
client, ok := s.getServiceClient(req.MethodDesc)
if !ok {
return nil, fmt.Errorf("unknow or unregister service: `%s", req.GetMethodDesc().GetName())
}
res := &ClientCreateStream_Reply{}
if req.MethodDesc == nil {
return nil, fmt.Errorf("cannot invoke `CreateClientStream` without a `MethodDesc`")
}
if !req.MethodDesc.IsClientStream && !req.MethodDesc.IsServerStream {
return nil, fmt.Errorf("cannot call a unary method with `CreateClientStream`")
}
desc := &grpcutil.LazyMethodDesc{
Name: req.MethodDesc.Name,
ServerStreams: req.MethodDesc.IsServerStream,
ClientStreams: req.MethodDesc.IsClientStream,
}
sctx := newOutgoingContext(client.rootCtx, req.Header)
in := grpcutil.NewLazyMessage().FromBytes(req.Payload)
cstream, err := client.lc.InvokeStream(sctx, desc, in)
res.Error = getServiceError(err)
if err == nil {
res.StreamId = strconv.FormatUint(cstream.ID(), 16)
s.registerStream(res.StreamId, cstream)
}
return res, nil
}
// Send Message over the given stream
func (s *service) ClientStreamSend(ctx context.Context, req *ClientStreamSend_Request) (*ClientStreamSend_Reply, error) {
id := req.StreamId
cstream, err := s.getSream(id)
if err != nil {
return nil, err
}
res := &ClientStreamSend_Reply{StreamId: id}
in := grpcutil.NewLazyMessage().FromBytes(req.Payload)
err = cstream.SendMsg(in)
res.Error = getServiceError(err)
if err != nil {
res.Trailer = convertMetadata(cstream.Trailer())
s.muStreams.Lock()
delete(s.streams, id)
s.muStreams.Unlock()
}
return res, nil
}
// Recv message over the given stream
func (s *service) ClientStreamRecv(ctx context.Context, req *ClientStreamRecv_Request) (*ClientStreamRecv_Reply, error) {
id := req.StreamId
cstream, err := s.getSream(id)
if err != nil {
return nil, err
}
return s.clientStreamRecv(id, cstream), nil
}
// Close the given stream
func (s *service) ClientStreamClose(ctx context.Context, req *ClientStreamClose_Request) (*ClientStreamClose_Reply, error) {
id := req.StreamId
cstream, err := s.getSream(id)
if err != nil {
return nil, err
}
err = cstream.Close()
if err != nil {
return nil, err
}
return &ClientStreamClose_Reply{
Error: getServiceError(err),
}, nil
}
// Close send on the given stream and return reply
func (s *service) ClientStreamCloseAndRecv(ctx context.Context, req *ClientStreamCloseAndRecv_Request) (*ClientStreamCloseAndRecv_Reply, error) {
id := req.StreamId
cstream, err := s.getSream(id)
if err != nil {
return nil, err
}
if err := cstream.CloseSend(); err != nil {
return nil, err
}
reply := s.clientStreamRecv(id, cstream)
return &ClientStreamCloseAndRecv_Reply{
StreamId: id,
Error: reply.Error,
Payload: reply.Payload,
Trailer: reply.Trailer,
}, nil
}
func (s *service) clientStreamRecv(id string, cstream *grpcutil.LazyStream) *ClientStreamRecv_Reply {
res := &ClientStreamRecv_Reply{StreamId: id}
out := grpcutil.NewLazyMessage()
err := cstream.RecvMsg(out)
if err != nil {
s.muStreams.Lock()
delete(s.streams, id)
s.muStreams.Unlock()
}
res.Error = getServiceError(err)
res.Trailer = convertMetadata(cstream.Trailer())
res.Payload = out.Bytes()
return res
}
func (s *service) getSream(id string) (*grpcutil.LazyStream, error) {
s.muStreams.RLock()
defer s.muStreams.RUnlock()
if cstream, ok := s.streams[id]; ok {
return cstream, nil
}
return nil, fmt.Errorf("invalid stream id")
}
func (s *service) registerStream(id string, cstream *grpcutil.LazyStream) {
s.muStreams.Lock()
s.streams[id] = cstream
s.muStreams.Unlock()
}
func newOutgoingContext(ctx context.Context, md []*Metadata) context.Context {
outmd := make(metadata.MD)
for _, m := range md {
outmd.Append(m.Key, m.Values...)
}
return metadata.NewOutgoingContext(ctx, outmd)
}
func convertMetadata(in metadata.MD) []*Metadata {
out := make([]*Metadata, in.Len())
i := 0
for k, v := range in {
out[i] = &Metadata{
Key: k,
Values: v,
}
i++
}
return out
}
func getServiceError(err error) *Error {
if err == nil {
return &Error{}
}
grpcErrCode := GRPCErrCode_OK
if s := status.Convert(err); s.Code() != codes.OK {
grpcErrCode = GRPCErrCode(s.Code())
}
errCode := errcode.Undefined
errCodes := errcode.Codes(err)
if len(errCodes) > 0 {
errCode = errCodes[0]
}
return &Error{
GrpcErrorCode: grpcErrCode,
ErrorCode: errCode,
ErrorDetails: &errcode.ErrDetails{Codes: errCodes},
Message: err.Error(),
}
}