Class: DohDb::MigrateChecker

Inherits:
Object
  • Object
show all
Defined in:
lib/doh/mysql/migrate_check.rb

Instance Method Summary collapse

Constructor Details

#initialize(database = nil) ⇒ MigrateChecker

Returns a new instance of MigrateChecker.



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# File 'lib/doh/mysql/migrate_check.rb', line 9

def initialize(database = nil)
  @database = database || DohApp::config['primary_database']
  @data_directory = File.join(DohApp::home, 'database', @database)
  @check_database = 'migration_check_database'
  @sql_previous = "/tmp/check_migration_#{@database}_previous.sql"
  @sql_previous_up = "/tmp/check_migration_#{@database}_previous_up.sql"
  @sql_latest = "/tmp/check_migration_#{@database}_latest.sql"
  @sql_latest_down = "/tmp/check_migration_#{@database}_latest_down.sql"
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/doh/mysql/migrate_check.rb', line 19

def run
  svnout = `svn st #@data_directory`
  unless svnout.strip.empty?
    return [false, "svn status shows local changes in #@data_directory -- this needs to be resolved before migration can be checked"]
  end

  @latest_version = DohDb::latest_database_version(@database)
  if @latest_version == 0
    return [true, "no migrations to check, database version is still at 0"]
  end

  @previous_version, @previous_svn_revision = DohDb::locked_version_info(@database)
  if @latest_version == @previous_version
    return [true, "no unlocked migration exists, nothing to check"]
  end

  dbmigrator = DohDb::DatabaseMigrator.new(@check_database, @database)
  if File.exist?(dbmigrator.up_filename(@latest_version + 1))
    puts "multiple unlocked versions exist, should merge into version: #{@latest_version}"
    exit 1
  end
  dohlog.debug("comparing database revisions #@previous_version and #@latest_version")

  dohlog.debug("svn updating to revision #@previous_svn_revision, building database, dumping as #{@sql_previous}")
  execute_cmd("svn up -r#@previous_svn_revision #@data_directory")

  DohDb::DatabaseCreator.new.exclude_scripts.create_database_copy(@check_database, @database, true)
  dump_sql(@sql_previous)

  dohlog.debug("svn updating to current revision, migrating to latest database version, dumping as #{@sql_previous_up}")
  execute_cmd("svn up #@data_directory")
  dbmigrator.update
  dump_sql(@sql_previous_up)

  dohlog.debug("re-creating database from current database files, dumping as #{@sql_latest}")
  begin
    DohDb::DatabaseCreator.new.exclude_scripts.create_database_copy(@check_database, @database, true)
  rescue Errno::ENOENT => e
    puts 'got exception during database creation -- possible view in order.yml that doesn\'t exist?'
    raise e
  end
  dump_sql(@sql_latest)

  dohlog.debug("migrating to previous version, dumping as #{@sql_latest_down}")
  DohDb::DatabaseMigrator.new(@check_database, @database).make_version(@previous_version)

  dump_sql(@sql_latest_down)

  diffstr = diff(@sql_previous, @sql_latest_down)
  return [false, diffstr] unless diffstr.empty?

  diffstr = diff(@sql_previous_up, @sql_latest)
  return [false, diffstr] unless diffstr.empty?

  File.delete(@sql_previous)
  File.delete(@sql_previous_up)
  File.delete(@sql_latest)
  File.delete(@sql_latest_down)

  [true, 'unlocked migration compared successfully']
end