Gamma

Database Synchronizer. Transfer data from one database to another easily.

Installation

Add this line to your application's Gemfile:

gem 'gamma'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gamma

Usage

Dryrun

gamma dryrun --settings ./tmp/settings.yml --data ./tmp/data.yml

Apply

gamma apply --settings ./tmp/settings.yml --data ./tmp/data.yml

data.yml Example

- data:
    table:
      - "*"
    table_without:
      - "users"
      - "schema_migrations"
      - "ar_internal_metadata"
    mode: "replace"
    delta_column: "updated_at"
- data:
    table: "users"
    mode: "replace"
    delta_column: "updated_at"
    hooks:
      - column:
          name:
            - "email"
          scripts:
            - "hooks/mask_email.rb"
      - column:
          name:
            - "name"
          scripts:
            - "hooks/mask_name.rb"
      - row:
          scripts:
            - "hooks/image.rb"

Hook Script Example

# $YourDir/hooks/mask_name.rb

class MaskName
  def execute(apply, column, value)
    value = "●●#{value[2..-1]}"
    value
  end
end

# $YourDir/hooks/image.rb

class Image
  def execute(apply, record)
    #
    # Copy image data from one storage to another
    #

    record
  end
end

settings.yml Example

in_database_config:
  adapter: mysql2
  encoding: utf8
  database: real_database
  pool: 5
  host: localhost
  username: root
  password:
out_database_config:
  adapter: mysql2
  encoding: utf8
  database: sync_to_database
  pool: 5
  host: localhost
  username: root
  password:

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update 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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/nishio-dens/gamma. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

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