Ecco

MySQL (5.6 and 5.7) replication binlog parser using mysql-binlog-connector-java.

Installation

Add this line to your application's Gemfile:

gem "ecco"

And then execute:

$ bundle

Or install it yourself as:

$ gem install ecco

Usage

require "ecco"

hostname = "localhost" # Optional
port     = 3306        # Optional
username = "username"
password = "password"

client = Ecco::Client.new(hostname: hostname, port: port, username: username, password: password)

client.on_row_event do |row_event|
  type     = row_event.type
  database = row_event.database
  table    = row_event.table
  rows     = row_event.rows

  next unless database == "FooDatabase"
  next unless table == "FooTable"

  second_column = rows.first[1]

  puts "Row event: #{database} #{table} #{type} #{second_column}"
end

client.on_save_position do |filename, position, event_type_name|
  puts "Saved #{event_type_name} event: #{filename} #{position}"
end

client.on_communication_failure do |client, error|
  puts error.message
end

# Optionally set a starting position
client.set_binlog_filename("mysql-bin.000009")
client.set_binlog_position(276753)

client.start

Development

To download a new version of mysql-binlog-connector-java

rake maven:dependencies

Note: You need Maven to download

brew install maven

Run the tests

bin/specs

For an interactive prompt

bin/console

To install this gem onto your local machine

bundle exec rake install

Integration tests

The integration tests don't run by default. To run all the tests, including integration, use

bin/all_specs

The tests needs a MySQL server with replication enabled.

Ecco includes multiple Docker Compose definitions that can be used for this, one per supported MySQL version.

Start the desired version before running the tests:

# MySQL 5.6
docker-compose -f docker-compose-mysql-base.yml -f docker-compose-mysql-5-6.yml up

# MySQL 5.7
docker-compose -f docker-compose-mysql-base.yml -f docker-compose-mysql-5-7.yml up

# MySQL 8.0
docker-compose -f docker-compose-mysql-base.yml -f docker-compose-mysql-8-0.yml up

Note: Stop any local MySQL server first, otherwise there will be port collisions

Release

To release a new version, make a commit bumping the version number in version.rb, and then run

bundle exec rake release

which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Update the changelog with GitHub Changelog Generator:

github_changelog_generator

Preparations you might have to do:

• gem install github_changelog_generator if you don't have it
• set CHANGELOG_GITHUB_TOKEN to a personal access token to increase your GitHub API rate limit

Make a commit with the changelog changes and push.

License

The gem is available as open source under the terms of the Apache License, Version 2.0.