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Add compatibility with protobuf 28 #541

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Add compatibility with protobuf 28 #541

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8986a68
Add compatibility with protobuf 28
ramir0-sultanov Sep 19, 2024
ff01a7f
Add message verification after message down casts
ramir0-sultanov Oct 26, 2024
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46 changes: 45 additions & 1 deletion include/gz/transport/RepHandler.hh
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Original file line number Diff line number Diff line change
Expand Up @@ -141,7 +141,12 @@ namespace gz
return false;
}

#if GOOGLE_PROTOBUF_VERSION >= 4022000
#if GOOGLE_PROTOBUF_VERSION >= 5028000
const auto msgReq =
google::protobuf::DynamicCastMessage<Req>(&_msgReq);
auto msgRep =
google::protobuf::DynamicCastMessage<Rep>(&_msgRep);
#elif GOOGLE_PROTOBUF_VERSION >= 4022000
auto msgReq =
google::protobuf::internal::DownCast<const Req*>(&_msgReq);
auto msgRep = google::protobuf::internal::DownCast<Rep*>(&_msgRep);
Expand All @@ -154,6 +159,45 @@ namespace gz
auto msgRep = google::protobuf::internal::down_cast<Rep*>(&_msgRep);
#endif

// Verify the dynamically casted messages are valid
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Does it make sense to move this block of verifications after all the ifdefs? That way we could validate all versions.

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It is me being extra cautious to not break parts of code that already work. After checking the source code of protobuf, I found that google::protobuf::Message::GetDescriptor() and google::protobuf::Descriptor::full_name() functions were in the initial commit. Assuming, they were not removed after that, I think, it is safe to validate messages using the specified block of code. The changes can be found in the corresponding commit.

if (msgReq == nullptr || msgRep == nullptr)
{
if (msgReq == nullptr)
{
if (_msgReq.GetDescriptor() != nullptr)
{
std::cerr << "RepHandler::RunLocalCallback() error: "
<< "Failed to cast the request of the type "
<< _msgReq.GetDescriptor()->full_name()
<< " to the specified type" << '\n';
}
else
{
std::cerr << "RepHandler::RunLocalCallback() error: "
<< "Failed to cast the request of an unknown type"
<< " to the specified type" << '\n';
}
}
if (msgRep == nullptr)
{
if (_msgRep.GetDescriptor() != nullptr)
{
std::cerr << "RepHandler::RunLocalCallback() error: "
<< "Failed to cast the response of the type "
<< _msgRep.GetDescriptor()->full_name()
<< " to the specified type" << '\n';
}
else
{
std::cerr << "RepHandler::RunLocalCallback() error: "
<< "Failed to cast the response of an unknown type"
<< " to the specified type" << '\n';
}
}
std::cerr.flush();
return false;
}

return this->cb(*msgReq, *msgRep);
}

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24 changes: 23 additions & 1 deletion include/gz/transport/SubscriptionHandler.hh
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Original file line number Diff line number Diff line change
Expand Up @@ -214,14 +214,36 @@ namespace gz
if (!this->UpdateThrottling())
return true;

#if GOOGLE_PROTOBUF_VERSION >= 4022000
#if GOOGLE_PROTOBUF_VERSION >= 5028000
auto msgPtr = google::protobuf::DynamicCastMessage<T>(&_msg);
#elif GOOGLE_PROTOBUF_VERSION >= 4022000
auto msgPtr = google::protobuf::internal::DownCast<const T*>(&_msg);
#elif GOOGLE_PROTOBUF_VERSION >= 3000000
auto msgPtr = google::protobuf::down_cast<const T*>(&_msg);
#else
auto msgPtr = google::protobuf::internal::down_cast<const T*>(&_msg);
#endif

// Verify the dynamically casted message is valid
if (msgPtr == nullptr)
{
if (_msg.GetDescriptor() != nullptr)
{
std::cerr << "SubscriptionHandler::RunLocalCallback() error: "
<< "Failed to cast the message of the type "
<< _msg.GetDescriptor()->full_name()
<< " to the specified type" << '\n';
}
else
{
std::cerr << "SubscriptionHandler::RunLocalCallback() error: "
<< "Failed to cast the message of an unknown type"
<< " to the specified type" << '\n';
}
std::cerr.flush();
return false;
}

this->cb(*msgPtr, _info);
return true;
}
Expand Down