// Listing 04 code/ch18
int TextListener::play_message (ACE_FILE_Addr &addr)
{
MessageType *type = Util::identify_message (addr);
if (type->is_text ())
{
Command *c = new Command ();
c->command_ = Command::CMD_PLAY_MESSAGE;
c->extra_data_ = &addr;
c = this->command_stream_->execute (c);
return c->numeric_result_;
}
ACE_FILE_Addr temp (ACE_TEXT ("/tmp/outgoing_message.text"));
ACE_FILE_IO *file;
if (type->is_audio ())
file = Util::audio_to_text (addr, temp);
else if (type->is_video ())
file = Util::video_to_text (addr, temp);
else
ACE_ERROR_RETURN
((LM_ERROR, ACE_TEXT ("Invalid message type %d\n"),
type->get_codec ()), -1);
int rval = this->play_message (temp);
file->remove ();
return rval;
}
void IPC::setMessageHeaderID(MessageType& message, const uint64_t id)
{
const auto header_field = message.GetDescriptor()->FindFieldByName("header");
auto reflection = message.GetReflection();
auto header_message = reflection->MutableMessage(&message, header_field);
if (header_message->GetTypeName() != IPC::MessageHeader::default_instance().GetTypeName()) {
throw std::runtime_error("unknown message header type");
}
auto header = reinterpret_cast<IPC::MessageHeader*>(header_message);
header->set_id(id);
}
uint64_t IPC::getMessageHeaderID(const MessageType& message)
{
const auto header_field = message.GetDescriptor()->FindFieldByName("header");
const auto reflection = message.GetReflection();
const auto& header_message = reflection->GetMessage(message, header_field);
if (header_message.GetTypeName() != IPC::MessageHeader::default_instance().GetTypeName()) {
throw std::runtime_error("unknown message header type");
}
const auto header = reinterpret_cast<const IPC::MessageHeader&>(header_message);
return header.id();
}
static bool
parseMessage(ZeroCopyInputStream& stream, MessageType& message)
{
// We need to create a new `CodedInputStream` for each message so that the
// 64MB limit is applied per-message rather than to the whole stream.
CodedInputStream codedStream(&stream);
// Because protobuf messages aren't self-delimiting, we serialize each message
// preceeded by its size in bytes. When deserializing, we read this size and
// then limit reading from the stream to the given byte size. If we didn't,
// then the first message would consume the entire stream.
uint32_t size = 0;
if (NS_WARN_IF(!codedStream.ReadVarint32(&size)))
return false;
auto limit = codedStream.PushLimit(size);
if (NS_WARN_IF(!message.ParseFromCodedStream(&codedStream)) ||
NS_WARN_IF(!codedStream.ConsumedEntireMessage()))
{
return false;
}
codedStream.PopLimit(limit);
return true;
}
static void cb_func(const lcm_recv_buf_t *rbuf, const char *channel,
void *user_data)
{
typedef LCMTypedSubscription<MessageType,ContextClass> SubsClass;
SubsClass *subs = static_cast<SubsClass *> (user_data);
MessageType msg;
int status = msg.decode(rbuf->data, 0, rbuf->data_size);
if (status < 0) {
fprintf (stderr, "error %d decoding %s!!!\n", status,
MessageType::getTypeName());
return;
}
const ReceiveBuffer rb = {
rbuf->data,
rbuf->data_size,
rbuf->recv_utime
};
subs->handler(&rb, channel, &msg, subs->context);
}
static void cb_func(const lcm_recv_buf_t *rbuf, const char *channel,
void *user_data)
{
LCMMHSubscription<MessageType,MessageHandlerClass> *subs =
static_cast<LCMMHSubscription<MessageType,MessageHandlerClass> *>(user_data);
MessageType msg;
int status = msg.decode(rbuf->data, 0, rbuf->data_size);
if (status < 0) {
fprintf (stderr, "error %d decoding %s!!!\n", status,
MessageType::getTypeName());
return;
}
const ReceiveBuffer rb = {
rbuf->data,
rbuf->data_size,
rbuf->recv_utime
};
std::string chan_str(channel);
(subs->handler->*subs->handlerMethod)(&rb, chan_str, &msg);
}
static bool
parseMessage(ZeroCopyInputStream& stream, MessageType& message)
{
// We need to create a new `CodedInputStream` for each message so that the
// 64MB limit is applied per-message rather than to the whole stream.
CodedInputStream codedStream(&stream);
// The protobuf message nesting that core dumps exhibit is dominated by
// allocation stacks' frames. In the most deeply nested case, each frame has
// two messages: a StackFrame message and a StackFrame::Data message. These
// frames are on top of a small constant of other messages. There are a
// MAX_STACK_DEPTH number of frames, so we multiply this by 3 to make room for
// the two messages per frame plus some head room for the constant number of
// non-dominating messages.
codedStream.SetRecursionLimit(HeapSnapshot::MAX_STACK_DEPTH * 3);
// Because protobuf messages aren't self-delimiting, we serialize each message
// preceeded by its size in bytes. When deserializing, we read this size and
// then limit reading from the stream to the given byte size. If we didn't,
// then the first message would consume the entire stream.
uint32_t size = 0;
if (NS_WARN_IF(!codedStream.ReadVarint32(&size)))
return false;
auto limit = codedStream.PushLimit(size);
if (NS_WARN_IF(!message.ParseFromCodedStream(&codedStream)) ||
NS_WARN_IF(!codedStream.ConsumedEntireMessage()) ||
NS_WARN_IF(codedStream.BytesUntilLimit() != 0))
{
return false;
}
codedStream.PopLimit(limit);
return true;
}
inline bool operator==(MessageType const& left, MessageType const& right)
{
return (left.value() == right.value());
}