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CONTRIBUTING.md

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Contributing to sqlite3-ruby

This document is a work-in-progress.

This doc is a short introduction on how to modify and maintain the sqlite3-ruby gem.

Architecture notes

Garbage collection

All statements keep pointers back to their respective database connections. The @connection instance variable on the Statement handle keeps the database connection alive. Memory allocated for a statement handler will be freed in two cases:

  1. #close is called on the statement
  2. The SQLite3::Database object gets garbage collected

We can't free the memory for the statement in the garbage collection function for the statement handler. The reason is because there exists a race condition. We cannot guarantee the order in which objects will be garbage collected. So, it is possible that a connection and a statement are up for garbage collection. If the database connection were to be free'd before the statement, then boom. Instead we'll be conservative and free unclosed statements when the connection is terminated.

Building gems

As a prerequisite please make sure you have docker correctly installed, so that you're able to cross-compile the native gems.

Run bin/build-gems which will package gems for all supported platforms, and run some basic sanity tests on those packages using bin/test-gem-set and bin/test-gem-file-contents.

Updating the version of libsqlite3

Update /dependencies.yml to reflect:

  • the version of libsqlite3
  • the URL from which to download
  • the checksum of the file, which will need to be verified manually (see comments in that file)

Making a release

A quick checklist:

  • make sure CI is green!
  • update CHANGELOG.md and lib/sqlite3/version.rb
  • run bin/build-gems and make sure it completes and all the tests pass
  • create a git tag using a format that matches the pattern v\d+\.\d+\.\d+, e.g. v1.3.13
  • git push && git push --tags
  • for g in gems/*.gem ; do gem push $g ; done
  • create a release at https:/sparklemotion/sqlite3-ruby/releases and include sha2 checksums