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google-protobuf-lib-update.md

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The google protobuf gem has not been updated for jruby in a while and is currently only available in version 3.5.0.pre whereas the official protobuf version is 3.18+. If you want to use a newer library version then please follow these instructions on how to manually build the google-protobuf.gem.

  1. Get the protobuf sources:
git clone https://github.com/protocolbuffers/protobuf.git;
cd protobuf;
git checkout $VERSION_YOU_WANT_TO_BUILD
  1. Check your compiler version. It needs to be at least the version that you want to build for. protoc --version

If your compiler is too old, build it from the repo:

git submodule update --init --recursive
./autogen.sh
./configure
make
make check
sudo make install

(instructions taken from their src/README.md - check for updates in there!)

  1. Build the gem: cd ruby; rake build && gem build *.gemspec

(Instructions taken from protocolbuffers/protobuf#1594 (comment))

  1. Change the dependency in the protobuf codec:

Step 3.a: clone this repo. git clone git@github.com:logstash-plugins/logstash-codec-protobuf.git

Step 3.b: edit the dependency in the gemspec to the version that you built in step 2.

Step 3.c: set the codec version in the gemspec to a number that is not available on rubygems.

Step 3.d: build the codec. rake build && gem build logstash-codec-protobuf.gemspec

  1. Install both gems in your Logstash (in this order):
logstash-plugin install --no-verify google-protobuf-$PROTOBUF_GEM_VERSION-java.gem
logstash-plugin install logstash-codec-protobuf-$PROTOBUF_INPUT_PLUGIN_VERSION.gem

Notes

We experimented with both the >= and the ~> operators in the dependency specification, such as s.add_runtime_dependency 'google-protobuf', '>= 3.5.0.pre but it would always lead to the ruby version of the protobuf gem to be pulled. Hints / PRs for pinning this to the Java/Jruby version would be appreciated and would render the steps in section 3 and parts of step 4 unnecessary.