474 lines
14 KiB
Ruby
474 lines
14 KiB
Ruby
require_dependency "db_helper"
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module BackupRestore
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class RestoreDisabledError < RuntimeError; end
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class FilenameMissingError < RuntimeError; end
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class Restorer
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attr_reader :success
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def initialize(user_id, opts={})
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@user_id = user_id
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@client_id = opts[:client_id]
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@filename = opts[:filename]
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@publish_to_message_bus = opts[:publish_to_message_bus] || false
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ensure_restore_is_enabled
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ensure_no_operation_is_running
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ensure_we_have_a_user
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ensure_we_have_a_filename
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initialize_state
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end
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def run
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log "[STARTED]"
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log "'#{@user_info[:username]}' has started the restore!"
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mark_restore_as_running
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listen_for_shutdown_signal
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ensure_directory_exists(@tmp_directory)
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copy_archive_to_tmp_directory
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unzip_archive
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extract_metadata
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validate_metadata
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extract_dump
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restore_dump
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### READ-ONLY / START ###
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enable_readonly_mode
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pause_sidekiq
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wait_for_sidekiq
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switch_schema!
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migrate_database
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reconnect_database
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reload_site_settings
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clear_emoji_cache
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disable_readonly_mode
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### READ-ONLY / END ###
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extract_uploads
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rescue SystemExit
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log "Restore process was cancelled!"
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rollback
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rescue => ex
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log "EXCEPTION: " + ex.message
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log ex.backtrace.join("\n")
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rollback
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else
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@success = true
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ensure
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begin
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notify_user
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clean_up
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rescue => ex
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Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n"))
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end
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@success ? log("[SUCCESS]") : log("[FAILED]")
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end
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protected
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def ensure_restore_is_enabled
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raise BackupRestore::RestoreDisabledError unless Rails.env.development? || SiteSetting.allow_restore?
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end
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def ensure_no_operation_is_running
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raise BackupRestore::OperationRunningError if BackupRestore.is_operation_running?
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end
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def ensure_we_have_a_user
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user = User.find_by(id: @user_id)
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raise Discourse::InvalidParameters.new(:user_id) unless user
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# keep some user data around to check them against the newly restored database
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@user_info = { id: user.id, username: user.username, email: user.email }
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end
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def ensure_we_have_a_filename
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raise BackupRestore::FilenameMissingError if @filename.nil?
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end
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def initialize_state
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@success = false
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@db_was_changed = false
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@current_db = RailsMultisite::ConnectionManagement.current_db
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@current_version = BackupRestore.current_version
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@timestamp = Time.now.strftime("%Y-%m-%d-%H%M%S")
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@tmp_directory = File.join(Rails.root, "tmp", "restores", @current_db, @timestamp)
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@source_filename = File.join(Backup.base_directory, @filename)
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@archive_filename = File.join(@tmp_directory, @filename)
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@tar_filename = @archive_filename[0...-3]
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@meta_filename = File.join(@tmp_directory, BackupRestore::METADATA_FILE)
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@is_archive = !(@filename =~ /.sql.gz$/)
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@logs = []
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@readonly_mode_was_enabled = Discourse.readonly_mode?
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end
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def listen_for_shutdown_signal
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Thread.new do
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while BackupRestore.is_operation_running?
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exit if BackupRestore.should_shutdown?
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sleep 0.1
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end
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end
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end
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def mark_restore_as_running
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log "Marking restore as running..."
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BackupRestore.mark_as_running!
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end
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def enable_readonly_mode
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return if @readonly_mode_was_enabled
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log "Enabling readonly mode..."
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Discourse.enable_readonly_mode
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end
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def pause_sidekiq
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log "Pausing sidekiq..."
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Sidekiq.pause!
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end
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def wait_for_sidekiq
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log "Waiting for sidekiq to finish running jobs..."
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iterations = 1
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while sidekiq_has_running_jobs?
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log "Waiting for sidekiq to finish running jobs... ##{iterations}"
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sleep 5
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iterations += 1
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raise "Sidekiq did not finish running all the jobs in the allowed time!" if iterations > 6
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end
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end
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def sidekiq_has_running_jobs?
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Sidekiq::Workers.new.each do |_, _, worker|
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payload = worker.try(:payload)
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return true if payload.try(:all_sites)
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return true if payload.try(:current_site_id) == @current_db
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end
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false
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end
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def copy_archive_to_tmp_directory
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log "Copying archive to tmp directory..."
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Discourse::Utils.execute_command('cp', @source_filename, @archive_filename, failure_message: "Failed to copy archive to tmp directory.")
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end
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def unzip_archive
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return unless @is_archive
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log "Unzipping archive, this may take a while..."
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FileUtils.cd(@tmp_directory) do
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Discourse::Utils.execute_command('gzip', '--decompress', @archive_filename, failure_message: "Failed to unzip archive.")
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end
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end
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def extract_metadata
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log "Extracting metadata file..."
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@metadata =
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if system('tar', '--list', '--file', @tar_filename, BackupRestore::METADATA_FILE)
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FileUtils.cd(@tmp_directory) do
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Discourse::Utils.execute_command(
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'tar', '--extract', '--file', @tar_filename, BackupRestore::METADATA_FILE,
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failure_message: "Failed to extract metadata file."
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)
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end
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data = Oj.load_file(@meta_filename)
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raise "Failed to load metadata file." if !data
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data
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else
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if @filename =~ /-#{BackupRestore::VERSION_PREFIX}(\d{14})/
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{ "version" => Regexp.last_match[1].to_i }
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else
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raise "Migration version is missing from the filename."
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end
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end
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end
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def validate_metadata
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log "Validating metadata..."
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log " Current version: #{@current_version}"
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raise "Metadata has not been extracted correctly." if !@metadata
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log " Restored version: #{@metadata["version"]}"
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error = "You're trying to restore a more recent version of the schema. You should migrate first!"
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raise error if @metadata["version"] > @current_version
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end
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def extract_dump
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@dump_filename =
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if @is_archive
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# For backwards compatibility
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if system('tar', '--list', '--file', @tar_filename, BackupRestore::OLD_DUMP_FILE)
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File.join(@tmp_directory, BackupRestore::OLD_DUMP_FILE)
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else
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File.join(@tmp_directory, BackupRestore::DUMP_FILE)
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end
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else
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File.join(@tmp_directory, @filename)
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end
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return unless @is_archive
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log "Extracting dump file..."
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FileUtils.cd(@tmp_directory) do
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Discourse::Utils.execute_command(
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'tar', '--extract', '--file', @tar_filename, File.basename(@dump_filename),
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failure_message: "Failed to extract dump file."
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)
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end
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end
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def restore_dump_command
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if File.extname(@dump_filename) == '.gz'
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"gzip -d < #{@dump_filename} | #{sed_command} | #{psql_command} 2>&1"
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else
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"#{psql_command} 2>&1 < #{@dump_filename}"
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end
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end
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def restore_dump
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log "Restoring dump file... (can be quite long)"
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logs = Queue.new
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psql_running = true
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has_error = false
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Thread.new do
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RailsMultisite::ConnectionManagement::establish_connection(db: @current_db)
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while psql_running
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message = logs.pop.strip
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has_error ||= (message =~ /ERROR:/)
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log(message) unless message.blank?
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end
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end
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IO.popen(restore_dump_command) do |pipe|
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begin
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while line = pipe.readline
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logs << line
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end
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rescue EOFError
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# finished reading...
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ensure
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psql_running = false
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logs << ""
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end
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end
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# psql does not return a valid exit code when an error happens
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raise "psql failed" if has_error
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end
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def psql_command
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db_conf = BackupRestore.database_configuration
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password_argument = "PGPASSWORD=#{db_conf.password}" if db_conf.password.present?
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host_argument = "--host=#{db_conf.host}" if db_conf.host.present?
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port_argument = "--port=#{db_conf.port}" if db_conf.port.present?
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username_argument = "--username=#{db_conf.username}" if db_conf.username.present?
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[ password_argument, # pass the password to psql (if any)
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"psql", # the psql command
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"--dbname='#{db_conf.database}'", # connect to database *dbname*
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"--single-transaction", # all or nothing (also runs COPY commands faster)
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host_argument, # the hostname to connect to (if any)
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port_argument, # the port to connect to (if any)
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username_argument # the username to connect as (if any)
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].join(" ")
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end
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def sed_command
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# in order to limit the downtime when restoring as much as possible
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# we force the restoration to happen in the "restore" schema
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# during the restoration, this make sure we
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# - drop the "restore" schema if it exists
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# - create the "restore" schema
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# - prepend the "restore" schema into the search_path
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regexp = "SET search_path = public, pg_catalog;"
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replacement = [ "DROP SCHEMA IF EXISTS restore CASCADE;",
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"CREATE SCHEMA restore;",
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"SET search_path = restore, public, pg_catalog;",
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].join(" ")
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# we only want to replace the VERY first occurence of the search_path command
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expression = "1,/^#{regexp}$/s/#{regexp}/#{replacement}/"
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"sed -e '#{expression}'"
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end
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def switch_schema!
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log "Switching schemas... try reloading the site in 5 minutes, if successful, then reboot and restore is complete."
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sql = [
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"BEGIN;",
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BackupRestore.move_tables_between_schemas_sql("public", "backup"),
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BackupRestore.move_tables_between_schemas_sql("restore", "public"),
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"COMMIT;"
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].join("\n")
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@db_was_changed = true
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User.exec_sql(sql)
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end
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def migrate_database
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log "Migrating the database..."
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Discourse::Application.load_tasks
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ENV["VERSION"] = @current_version.to_s
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User.exec_sql("SET search_path = public, pg_catalog;")
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Rake::Task["db:migrate"].invoke
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end
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def reconnect_database
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log "Reconnecting to the database..."
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RailsMultisite::ConnectionManagement::establish_connection(db: @current_db)
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end
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def reload_site_settings
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log "Reloading site settings..."
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SiteSetting.refresh!
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end
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def clear_emoji_cache
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log "Clearing emoji cache..."
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Emoji.clear_cache
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end
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def extract_uploads
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if system('tar', '--exclude=*/*', '--list', '--file', @tar_filename, 'uploads')
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log "Extracting uploads..."
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FileUtils.cd(@tmp_directory) do
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Discourse::Utils.execute_command(
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'tar', '--extract', '--keep-newer-files', '--file', @tar_filename, 'uploads/',
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failure_message: "Failed to extract uploads."
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)
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end
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public_uploads_path = File.join(Rails.root, "public")
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FileUtils.cd(public_uploads_path) do
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FileUtils.mkdir_p("uploads")
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tmp_uploads_path = Dir.glob(File.join(@tmp_directory, "uploads", "*")).first
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previous_db_name = File.basename(tmp_uploads_path)
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current_db_name = RailsMultisite::ConnectionManagement.current_db
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Discourse::Utils.execute_command(
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'rsync', '-avp', '--safe-links', "#{tmp_uploads_path}/", "uploads/#{current_db_name}/",
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failure_message: "Failed to restore uploads."
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)
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if previous_db_name != current_db_name
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DbHelper.remap("uploads/#{previous_db_name}", "uploads/#{current_db_name}")
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end
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end
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end
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end
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def rollback
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log "Trying to rollback..."
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if @db_was_changed && BackupRestore.can_rollback?
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log "Rolling back..."
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BackupRestore.move_tables_between_schemas("backup", "public")
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else
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log "There was no need to rollback"
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end
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end
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def notify_user
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if user = User.find_by(email: @user_info[:email])
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log "Notifying '#{user.username}' of the end of the restore..."
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status = @success ? :restore_succeeded : :restore_failed
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SystemMessage.create_from_system_user(user, status,
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logs: Discourse::Utils.pretty_logs(@logs)
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)
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else
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log "Could not send notification to '#{@user_info[:username]}' (#{@user_info[:email]}), because the user does not exists..."
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end
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end
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def clean_up
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log "Cleaning stuff up..."
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remove_tmp_directory
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unpause_sidekiq
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disable_readonly_mode if Discourse.readonly_mode?
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mark_restore_as_not_running
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log "Finished!"
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end
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def remove_tmp_directory
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log "Removing tmp '#{@tmp_directory}' directory..."
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FileUtils.rm_rf(@tmp_directory) if Dir[@tmp_directory].present?
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rescue
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log "Something went wrong while removing the following tmp directory: #{@tmp_directory}"
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end
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def unpause_sidekiq
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log "Unpausing sidekiq..."
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Sidekiq.unpause!
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rescue
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log "Something went wrong while unpausing Sidekiq."
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end
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def disable_readonly_mode
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return if @readonly_mode_was_enabled
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log "Disabling readonly mode..."
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Discourse.disable_readonly_mode
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end
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def mark_restore_as_not_running
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log "Marking restore as finished..."
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BackupRestore.mark_as_not_running!
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end
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def ensure_directory_exists(directory)
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log "Making sure #{directory} exists..."
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FileUtils.mkdir_p(directory)
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end
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def log(message)
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timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
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puts(message) rescue nil
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publish_log(message, timestamp) rescue nil
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save_log(message, timestamp)
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end
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def publish_log(message, timestamp)
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return unless @publish_to_message_bus
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data = { timestamp: timestamp, operation: "restore", message: message }
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MessageBus.publish(BackupRestore::LOGS_CHANNEL, data, user_ids: [@user_id], client_ids: [@client_id])
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end
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def save_log(message, timestamp)
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@logs << "[#{timestamp}] #{message}"
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end
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end
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end
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