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server: export ServerTransportStreamFromContext for unary interceptors to control headers/trailers #2019

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merged 1 commit into from
Apr 27, 2018
Merged

server: export ServerTransportStreamFromContext for unary interceptors to control headers/trailers #2019

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18 changes: 10 additions & 8 deletions server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1298,10 +1298,12 @@ type ServerTransportStream interface {
SetTrailer(md metadata.MD) error
}

// serverStreamFromContext returns the server stream saved in ctx. Returns
// nil if the given context has no stream associated with it (which implies
// it is not an RPC invocation context).
func serverTransportStreamFromContext(ctx context.Context) ServerTransportStream {
// ServerTransportStreamFromContext returns the ServerTransportStream saved in
// ctx. Returns nil if the given context has no stream associated with it
// (which implies it is not an RPC invocation context).
//
// This API is EXPERIMENTAL.
func ServerTransportStreamFromContext(ctx context.Context) ServerTransportStream {
s, _ := ctx.Value(streamKey{}).(ServerTransportStream)
return s
}
Expand Down Expand Up @@ -1438,7 +1440,7 @@ func SetHeader(ctx context.Context, md metadata.MD) error {
if md.Len() == 0 {
return nil
}
stream := serverTransportStreamFromContext(ctx)
stream := ServerTransportStreamFromContext(ctx)
if stream == nil {
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
Expand All @@ -1448,7 +1450,7 @@ func SetHeader(ctx context.Context, md metadata.MD) error {
// SendHeader sends header metadata. It may be called at most once.
// The provided md and headers set by SetHeader() will be sent.
func SendHeader(ctx context.Context, md metadata.MD) error {
stream := serverTransportStreamFromContext(ctx)
stream := ServerTransportStreamFromContext(ctx)
if stream == nil {
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
Expand All @@ -1464,7 +1466,7 @@ func SetTrailer(ctx context.Context, md metadata.MD) error {
if md.Len() == 0 {
return nil
}
stream := serverTransportStreamFromContext(ctx)
stream := ServerTransportStreamFromContext(ctx)
if stream == nil {
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
Expand All @@ -1474,7 +1476,7 @@ func SetTrailer(ctx context.Context, md metadata.MD) error {
// Method returns the method string for the server context. The returned
// string is in the format of "/service/method".
func Method(ctx context.Context) (string, bool) {
s := serverTransportStreamFromContext(ctx)
s := ServerTransportStreamFromContext(ctx)
if s == nil {
return "", false
}
Expand Down
2 changes: 1 addition & 1 deletion server_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -128,7 +128,7 @@ func TestGetServiceInfo(t *testing.T) {
func TestStreamContext(t *testing.T) {
expectedStream := &transport.Stream{}
ctx := NewContextWithServerTransportStream(context.Background(), expectedStream)
s := serverTransportStreamFromContext(ctx)
s := ServerTransportStreamFromContext(ctx)
stream, ok := s.(*transport.Stream)
if !ok || expectedStream != stream {
t.Fatalf("GetStreamFromContext(%v) = %v, %t, want: %v, true", ctx, stream, ok, expectedStream)
Expand Down