mirror of
https://github.com/discourse/discourse.git
synced 2024-11-23 03:59:50 +08:00
120 lines
3.7 KiB
Ruby
120 lines
3.7 KiB
Ruby
require_dependency 'export/json_encoder'
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require_dependency 'export/export'
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require_dependency 'import/import'
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module Jobs
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class Exporter < Jobs::Base
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sidekiq_options :retry => false
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def execute(args)
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raise Import::ImportInProgressError if Import::is_import_running?
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raise Export::ExportInProgressError if Export::is_export_running?
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@format = args[:format] || :json
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@output_base_filename = File.absolute_path( args[:filename] || File.join( Rails.root, 'tmp', "export-#{Time.now.strftime('%Y-%m-%d-%H%M%S')}" ) )
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@output_base_filename = @output_base_filename[0...-3] if @output_base_filename[-3..-1] == '.gz'
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@output_base_filename = @output_base_filename[0...-4] if @output_base_filename[-4..-1] == '.tar'
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@user = args[:user_id] ? User.where(id: args[:user_id].to_i).first : nil
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start_export
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@encoder.write_schema_info( source: 'discourse', version: Export.current_schema_version )
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ordered_models_for_export.each do |model|
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log " #{model.table_name}"
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column_info = model.columns
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order_col = column_info.map(&:name).find {|x| x == 'id'} || order_columns_for(model)
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@encoder.write_table(model.table_name, column_info) do |num_rows_written|
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if order_col
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model.connection.select_rows("select * from #{model.table_name} order by #{order_col} limit #{batch_size} offset #{num_rows_written}")
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else
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# Take the rows in the order the database returns them
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log "WARNING: no order by clause is being used for #{model.name} (#{model.table_name}). Please update Jobs::Exporter order_columns_for for #{model.name}."
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model.connection.select_rows("select * from #{model.table_name} limit #{batch_size} offset #{num_rows_written}")
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end
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end
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end
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"#{@output_base_filename}.tar.gz"
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ensure
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finish_export
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end
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def ordered_models_for_export
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Export.models_included_in_export
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end
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def order_columns_for(model)
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@order_columns_for_hash ||= {
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'CategoryFeaturedTopic' => 'category_id, topic_id',
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'PostOneboxRender' => 'post_id, onebox_render_id',
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'PostReply' => 'post_id, reply_id',
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'PostTiming' => 'topic_id, post_number, user_id',
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'TopicUser' => 'topic_id, user_id',
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'View' => 'parent_id, parent_type, ip, viewed_at'
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}
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@order_columns_for_hash[model.name]
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end
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def batch_size
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1000
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end
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def start_export
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if @format == :json
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@encoder = Export::JsonEncoder.new
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else
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raise Export::FormatInvalidError
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end
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Export.set_export_started
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Discourse.enable_maintenance_mode
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end
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def finish_export
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if @encoder
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@encoder.finish
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create_tar_file
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@encoder.cleanup_temp
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end
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ensure
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Export.set_export_is_not_running
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Discourse.disable_maintenance_mode
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send_notification
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end
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def create_tar_file
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filenames = @encoder.filenames
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FileUtils.cd( File.dirname(filenames.first) ) do
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`tar cvf #{@output_base_filename}.tar #{File.basename(filenames.first)}`
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end
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FileUtils.cd( File.join(Rails.root, 'public') ) do
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Upload.find_each do |upload|
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`tar rvf #{@output_base_filename}.tar #{upload.url[1..-1]}` unless upload.url[0,4] == 'http'
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end
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end
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`gzip #{@output_base_filename}.tar`
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true
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end
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def send_notification
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SystemMessage.new(@user).create('export_succeeded') if @user
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true
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end
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def log(*args)
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puts args
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args.each do |arg|
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Rails.logger.info "#{Time.now.to_formatted_s(:db)}: [EXPORTER] #{arg}"
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end
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true
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end
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end
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end
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