Class: Exwiw::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/exwiw/runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(connection_config:, output_dir:, config_dir:, dump_target:, logger:) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/exwiw/runner.rb', line 7

def initialize(
  connection_config:,
  output_dir:,
  config_dir:,
  dump_target:,
  logger:
)
  @connection_config = connection_config
  @output_dir = output_dir
  @config_dir = config_dir
  @dump_target = dump_target
  @logger = logger
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/exwiw/runner.rb', line 21

def run
  adapter = Adapter.build(@connection_config, @logger)
  tables = load_table_config

  @logger.info("Determining table processing order...")
  ordered_table_names = DetermineTableProcessingOrder.run(tables)

  if !Dir.exist?(@output_dir)
    FileUtils.mkdir_p(@output_dir)
  end

  table_by_name = tables.each_with_object({}) { |table, hash| hash[table.name] = table }

  total_size = ordered_table_names.size
  ordered_table_names.each_with_index do |table_name, idx|
    @logger.info("Processing table '#{table_name}'... (#{idx + 1}/#{total_size})")
    table = table_by_name.fetch(table_name)

    query_ast = QueryAstBuilder.run(table.name, table_by_name, @dump_target, @logger)
    results = adapter.execute(query_ast)
    record_num = results.size

    if record_num.zero?
      @logger.info("  No records matched. skip this table.")
      next
    end
    @logger.debug("  Generate INSERT SQL...")

    chunk_size = table.bulk_insert_chunk_size
    chunks = chunk_size ? results.each_slice(chunk_size).to_a : [results]
    insert_sql = chunks.map { |chunk_rows| adapter.to_bulk_insert(chunk_rows, table) }.join("\n")

    @logger.info("  Generated INSERT SQL for #{record_num} records (#{chunks.size} statement(s)).")
    insert_idx = (idx + 1).to_s.rjust(3, '0')
    File.open(File.join(@output_dir, "insert-#{insert_idx}-#{table_name}.sql"), 'w') do |file|
      file.puts(insert_sql)
    end

    @logger.debug("  Generate DELETE SQL...")
    delete_sql = adapter.to_bulk_delete(query_ast, table)
    if @logger.debug?
      @logger.debug("  Generated DELETE SQL:\n#{delete_sql}")
    else
      @logger.info("  Generated DELETE SQL.")
    end
    delete_idx = (total_size - idx).to_s.rjust(3, '0')
    File.open(File.join(@output_dir, "delete-#{delete_idx}-#{table_name}.sql"), 'w') do |file|
      file.puts(delete_sql)
    end
  end
end