Module: Switchman::RSpecHelper

Defined in:
lib/switchman/r_spec_helper.rb

Overview

including this module in your specs will give you several shards to work with during specs:

* Shard.default - the test database itself
* @shard1 - a shard possibly using the same connection as Shard.default
* @shard2 - a shard using a dedicated connection
* @shard3 - a shard using the same connection as @shard1 (this might
            be Shard.default if they already share a connection, or
            a separate shard)

Constant Summary collapse

@@keep_the_shards = 
false
@@shard1 = 
nil

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/switchman/r_spec_helper.rb', line 16

def self.included(klass)
  # our before handlers have already been configured from a parent group; don't add them again
  return if klass.parent_groups[1..-1].any? { |group| group.included_modules.include?(self) }

  ::RSpec.configure do |config|
    block = proc do
      if @@shard1
        # some specs are mean, and blow away our shards
        begin
          @@shard1.reload
          @@shard2.reload
          @@shard3.reload if @@shard3
        rescue ::ActiveRecord::RecordNotFound
          Shard.default.clone.save!
          Shard.default(true)
          @@shard1 = @@shard1.clone
          @@shard1.save!
          @@shard2 = @@shard2.clone
          @@shard2.save!
          if @@shard3
            @@shard3 = @@shard3.clone
            @@shard3.save!
          end
        end
      end
    end
    # this module will be included multiple times, but we don't want to run this global hook multiple times
    if config.hooks[:before][:all].all? { |hook| hook.block.source_location != block.source_location }
      config.before(:all, &block)
    end
  end

  klass.before(:all) do
    unless @@shard1
      puts "Setting up sharding for all specs..."
      @@shard1, @@shard2 = TestHelper.recreate_persistent_test_shards
      if @@shard1.is_a?(Shard)
        @@keep_the_shards = true
        @@shard3 = nil
      else # @@shard1.is_a?(DatabaseServer)
        @@shard1 = @@shard1.create_new_shard
        @@shard2 = @@shard2.create_new_shard
        if @@shard1.database_server == Shard.default.database_server
          @@shard3 = nil
        else
          @@shard3 = @@shard1.database_server.create_new_shard
        end
      end
      puts "Done!"

      at_exit do
        # preserve rspec's exit status
        status= $!.is_a?(::SystemExit) ? $!.status : nil
        puts "Tearing down sharding for all specs"
        @@shard1.database_server.destroy unless @@shard1.database_server == Shard.default.database_server
        unless @@keep_the_shards
          @@shard1.drop_database
          @@shard1.destroy
          @@shard2.drop_database
          @@shard2.destroy
          if @@shard3
            @@shard3.drop_database
            @@shard3.destroy
          end
        end
        @@shard2.database_server.destroy
        exit status if status
      end
    end
    @shard1, @shard2 = @@shard1, @@shard2
    @shard3 = @@shard3 ? @@shard3 : Shard.default
  end

  klass.before do
    Shard.clear_cache
    if use_transactional_fixtures
      Shard.default(true)
      @shard1 = Shard.find(@shard1)
      @shard2 = Shard.find(@shard2)
      shards = [@shard2]
      shards << @shard1 unless @shard1.database_server == Shard.default.database_server
      shards.each do |shard|
        shard.activate do
          # this is how AR does it in fixtures.rb
          ::ActiveRecord::Base.connection.increment_open_transactions
          ::ActiveRecord::Base.connection.transaction_joinable = false
          ::ActiveRecord::Base.connection.begin_db_transaction
        end
      end
    end
  end

  klass.after do
    if use_transactional_fixtures
      shards = [@shard2]
      shards << @shard1 unless @shard1.database_server == Shard.default.database_server
      shards.each do |shard|
        shard.activate do
          if ::ActiveRecord::Base.connection.open_transactions != 0
            ::ActiveRecord::Base.connection.rollback_db_transaction
            ::ActiveRecord::Base.connection.decrement_open_transactions
          end
        end
      end
    end
  end
end