// Broadcast receives a stream of messages from a client for ordering
func (b *BackendAB) Broadcast(srv ab.AtomicBroadcast_BroadcastServer) error {
for {
envelope, err := srv.Recv()
if err != nil {
return err
}
if envelope.Payload == nil {
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_BAD_REQUEST})
if err != nil {
return err
}
}
req, err := proto.Marshal(envelope)
if err != nil {
panic(err)
}
b.backend.enqueueRequest(req)
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_SUCCESS})
if err != nil {
return err
}
}
}
func (b *broadcaster) queueEnvelopes(srv ab.AtomicBroadcast_BroadcastServer) error {
for {
select {
case <-b.exitChan:
return nil
default:
}
msg, err := srv.Recv()
if err != nil {
return err
}
payload := &cb.Payload{}
err = proto.Unmarshal(msg.Payload, payload)
if payload.Header == nil || payload.Header.ChainHeader == nil || payload.Header.ChainHeader.ChainID == "" {
logger.Debugf("Received malformed message, dropping connection")
return srv.Send(&ab.BroadcastResponse{Status: cb.Status_BAD_REQUEST})
}
support, ok := b.bs.sm.GetChain(payload.Header.ChainHeader.ChainID)
if !ok {
// Chain not found, maybe create one?
if payload.Header.ChainHeader.Type != int32(cb.HeaderType_CONFIGURATION_TRANSACTION) {
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_NOT_FOUND})
} else {
logger.Debugf("Proposing new chain")
err = srv.Send(&ab.BroadcastResponse{Status: b.bs.sm.ProposeChain(msg)})
}
} else {
// Normal transaction for existing chain
_, filterErr := support.Filters().Apply(msg)
if filterErr != nil {
logger.Debugf("Rejecting broadcast message")
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_BAD_REQUEST})
} else {
select {
case b.queue <- &msgAndSupport{msg: msg, support: support}:
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_SUCCESS})
default:
err = srv.Send(&ab.BroadcastResponse{Status: cb.Status_SERVICE_UNAVAILABLE})
}
}
}
if err != nil {
return err
}
}
}