Class: Makitzo::Migrations::Migrator

Inherits:
Object
  • Object
show all
Includes:
ApplicationAware, Paths, SSH::Multi
Defined in:
lib/makitzo/migrations/migrator.rb

Instance Method Summary collapse

Methods included from Paths

#local_migration_path

Methods included from SSH::Multi

#multi_connect, #multi_session, #multi_ssh, #ssh_context_class

Methods included from ApplicationAware

#app, #config, #logger, #store

Constructor Details

#initialize(app) ⇒ Migrator

Returns a new instance of Migrator.



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# File 'lib/makitzo/migrations/migrator.rb', line 7

def initialize(app)
  @app = app
end

Instance Method Details

#migrate(target_hosts) ⇒ Object 



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# File 'lib/makitzo/migrations/migrator.rb', line 11

def migrate(target_hosts)
  all_migrations = migrations
  return if all_migrations.empty?
  
  # start with a query matching all hosts and reduce to set of hosts
  # affected by existing migrations
  migration_hosts_query = World::Query.all
  all_migrations.each { |m| migration_hosts_query.merge!(m.query) }
  
  # get list of hosts and intersect with hosts specified on command-line
  migration_hosts = migration_hosts_query.exec(config)
  migration_hosts &= target_hosts
  
  # finally, remove any hosts with no pending migrations
  applied_migrations = store.applied_migrations_for_all_hosts
  migration_hosts.delete_if { |host|
    all_migrations.all? { |m|
      (applied_migrations[host.to_s] || []).include?(m.timestamp) || !m.query.includes?(host)
    }
  }
  
  multi_ssh(migration_hosts) do |host, conn, error|
    logger.with_host(host) do
      if error
        # log connection error
      else
        begin
          overseer_session = ssh_context_class.new(host, conn)
          overseer_session.makitzo_install_check!
      
          # then select the appropriate migrations, create session classes and run
          all_migrations.each do |migration_klass|
            next if (applied_migrations[host.to_s] || []).include?(migration_klass.timestamp)
            next unless migration_klass.query.includes?(host)
            migration = migration_klass.new(host, conn)
            migration.exec!("mkdir -p #{migration.x(migration.remote_directory)}")
            migration.up
            host.mark_migration_as_applied(migration)
            logger.success "Migration #{migration_klass.timestamp} applied"
          end
        rescue SSH::CommandFailed => e
          logger.error "Migration failed"
        end
      end
    end
  end
end