⚠️ Given Lambda Containers are a thing now... and coupled with the fact that there are no AWS provided Amazon Linux 2 / Lambda containers higher than Ruby 2.7, I'd like to consider this project deprecated in favor of using custom images with the RIC installed. This is really easy to do and I outlined it here for those curious. rails-lambda/lamby-cookiecutter#21

Mysql2 Lambda Gem

Very simple Mysql2 gem precompiled for Amazon Linux 1 & 2 (Ruby 2.5 & 2.7) with statically linked libmysqlclient ready for any AWS Lambda usage, including Rails. Add it to your Gemfile:

# When using Rails.
gem 'mysql2-lambda'

# When NOT using Rails.
gem 'mysql2-lambda', require: 'mysql2'

Part of a suite of open source projects from Lamby: Simple Rails & AWS Lambda Integration using Rack. Details include:

• Tested on Ruby 2.5.x & 2.7.x
• Small Size! Only 5 Megabytes. No Lambda Layers needed!
• Works with any MySQL connection. Including RDS Proxy.

Methodology

We used the amazon/aws-sam-cli-build-image-ruby2.5 Docker image from the SAM CLI project to build the MySQL Connector/C's libmysqlclient. From there we ensure the Mysql2 gem statically includes that library. The resulting packaged gem and mysql2.so file looks something like this.

$ ldd mysql2.so
  linux-vdso.so.1 =>  (0x00007ffcb15d4000)
  libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007fa8ebd21000)
  librt.so.1 => /lib64/librt.so.1 (0x00007fa8ebb19000)
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fa8eb8fd000)
  libgmp.so.10 => /usr/lib64/libgmp.so.10 (0x00007fa8eb687000)
  libdl.so.2 => /lib64/libdl.so.2 (0x00007fa8eb483000)
  libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fa8eb24c000)
  libm.so.6 => /lib64/libm.so.6 (0x00007fa8eaf4a000)
  libc.so.6 => /lib64/libc.so.6 (0x00007fa8eab7c000)
  libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fa8ea966000)
  /lib64/ld-linux-x86-64.so.2 (0x00007fa8ec72e000)
  libfreebl3.so => /lib64/libfreebl3.so (0x00007fa8ea764000)

Development

Clone or fork this repository, make sure you have Docker installed, then run the following commands.

./bin/setup
./bin/build

You will now have a packaged gem in the root of your project. Simple tests to make sure it works.

./bin/test 2.5
./bin/test 2.7

License

Thanks to all the contributors of the Mysql2 (https://github.com/brianmario/mysql2) gem. The license here is the same as that. MIT.

Code of Conduct

Everyone interacting in the Mysql2 Lambda project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.