kaysoky commented on a change in pull request #326: MESOS-6874: Validate the
match between Type and *Infos in the ContainerInfo.
URL: https://github.com/apache/mesos/pull/326#discussion_r264382919
##########
File path: src/slave/containerizer/composing.cpp
##########
@@ -425,6 +425,28 @@ Future<Containerizer::LaunchResult>
ComposingContainerizerProcess::_launch(
}
+static Try<Nothing> validateContainerInfoType(const ContainerInfo& info)
Review comment:
We use this "protobuf union" trick in tons of different protobufs, like the
`CheckInfo`, `HealthCheck`, `ExecutorInfo`, `Value`,
`Resource::DiskInfo::Source`, `Offer::Operation`, `Environment::Variable`,
`Secret`, `Image`, `Volume::Source`, and `ContainerInfo`.
I wonder if it would be helpful to make this a templated helper function in
`src/common/protobuf_utils.hpp`. Something like this (which I have not tried):
```
template <typename Info>
static Try<Nothing> validateProtobufUnion(const Info& info)
{
const auto* typeDescriptor = Info::Type_descriptor();
const auto* infoDescriptor = Info::descriptor();
...
}
```
With usage like:
```
CHECK_SOME(validateProtobufUnion<ContainerInfo>(info));
```
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