discourse/lib/backup_restore/backuper.rb

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require 'disk_space'
module BackupRestore
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class Backuper
attr_reader :success
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def initialize(user_id, opts = {})
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@user_id = user_id
@client_id = opts[:client_id]
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@publish_to_message_bus = opts[:publish_to_message_bus] || false
@with_uploads = opts[:with_uploads].nil? ? true : opts[:with_uploads]
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ensure_no_operation_is_running
ensure_we_have_a_user
initialize_state
end
def run
log "[STARTED]"
log "'#{@user.username}' has started the backup!"
mark_backup_as_running
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listen_for_shutdown_signal
ensure_directory_exists(@tmp_directory)
ensure_directory_exists(@archive_directory)
### READ-ONLY / START ###
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enable_readonly_mode
pause_sidekiq
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wait_for_sidekiq
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dump_public_schema
disable_readonly_mode
### READ-ONLY / END ###
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log "Finalizing backup..."
@with_uploads ? create_archive : move_dump_backup
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after_create_hook
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rescue SystemExit
log "Backup process was cancelled!"
rescue Exception => ex
log "EXCEPTION: " + ex.message
log ex.backtrace.join("\n")
@success = false
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else
@success = true
File.join(@archive_directory, @backup_filename)
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ensure
begin
notify_user
remove_old
clean_up
rescue => ex
Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n"))
end
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@success ? log("[SUCCESS]") : log("[FAILED]")
end
protected
def ensure_no_operation_is_running
raise BackupRestore::OperationRunningError if BackupRestore.is_operation_running?
end
def ensure_we_have_a_user
@user = User.find_by(id: @user_id)
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raise Discourse::InvalidParameters.new(:user_id) unless @user
end
def initialize_state
@success = false
@current_db = RailsMultisite::ConnectionManagement.current_db
@timestamp = Time.now.strftime("%Y-%m-%d-%H%M%S")
@tmp_directory = File.join(Rails.root, "tmp", "backups", @current_db, @timestamp)
@dump_filename = File.join(@tmp_directory, BackupRestore::DUMP_FILE)
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@archive_directory = File.join(Rails.root, "public", "backups", @current_db)
@archive_basename = File.join(@archive_directory, "#{SiteSetting.title.parameterize}-#{@timestamp}-#{BackupRestore::VERSION_PREFIX}#{BackupRestore.current_version}")
@backup_filename =
if @with_uploads
"#{File.basename(@archive_basename)}.tar.gz"
else
"#{File.basename(@archive_basename)}.sql.gz"
end
@logs = []
@readonly_mode_was_enabled = Discourse.readonly_mode? || !SiteSetting.readonly_mode_during_backup
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end
def listen_for_shutdown_signal
Thread.new do
while BackupRestore.is_operation_running?
exit if BackupRestore.should_shutdown?
sleep 0.1
end
end
end
def mark_backup_as_running
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log "Marking backup as running..."
BackupRestore.mark_as_running!
end
def enable_readonly_mode
return if @readonly_mode_was_enabled
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log "Enabling readonly mode..."
Discourse.enable_readonly_mode
end
def pause_sidekiq
log "Pausing sidekiq..."
Sidekiq.pause!
end
def wait_for_sidekiq
log "Waiting for sidekiq to finish running jobs..."
iterations = 1
while sidekiq_has_running_jobs?
log "Waiting for sidekiq to finish running jobs... ##{iterations}"
sleep 5
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iterations += 1
raise "Sidekiq did not finish running all the jobs in the allowed time!" if iterations > 6
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end
end
def sidekiq_has_running_jobs?
Sidekiq::Workers.new.each do |_, _, worker|
payload = worker.try(:payload)
return true if payload.try(:all_sites)
return true if payload.try(:current_site_id) == @current_db
end
false
end
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def dump_public_schema
log "Dumping the public schema of the database..."
logs = Queue.new
pg_dump_running = true
Thread.new do
RailsMultisite::ConnectionManagement::establish_connection(db: @current_db)
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while pg_dump_running
message = logs.pop.strip
log(message) unless message.blank?
end
end
IO.popen("#{pg_dump_command} 2>&1") do |pipe|
begin
while line = pipe.readline
logs << line
end
rescue EOFError
# finished reading...
ensure
pg_dump_running = false
logs << ""
end
end
raise "pg_dump failed" unless $?.success?
end
def pg_dump_command
db_conf = BackupRestore.database_configuration
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password_argument = "PGPASSWORD='#{db_conf.password}'" if db_conf.password.present?
host_argument = "--host=#{db_conf.host}" if db_conf.host.present?
port_argument = "--port=#{db_conf.port}" if db_conf.port.present?
username_argument = "--username=#{db_conf.username}" if db_conf.username.present?
[ password_argument, # pass the password to pg_dump (if any)
"pg_dump", # the pg_dump command
"--schema=public", # only public schema
"--file='#{@dump_filename}'", # output to the dump.sql file
"--no-owner", # do not output commands to set ownership of objects
"--no-privileges", # prevent dumping of access privileges
"--verbose", # specifies verbose mode
"--compress=4", # Compression level of 4
host_argument, # the hostname to connect to (if any)
port_argument, # the port to connect to (if any)
username_argument, # the username to connect as (if any)
db_conf.database # the name of the database to dump
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].join(" ")
end
def move_dump_backup
log "Finalizing database dump file: #{@backup_filename}"
Discourse::Utils.execute_command(
'mv', @dump_filename, File.join(@archive_directory, @backup_filename),
failure_message: "Failed to move database dump file."
)
remove_tmp_directory
end
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def create_archive
log "Creating archive: #{@backup_filename}"
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tar_filename = "#{@archive_basename}.tar"
log "Making sure archive does not already exist..."
Discourse::Utils.execute_command('rm', '-f', tar_filename)
Discourse::Utils.execute_command('rm', '-f', "#{tar_filename}.gz")
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log "Creating empty archive..."
Discourse::Utils.execute_command('tar', '--create', '--file', tar_filename, '--files-from', '/dev/null')
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log "Archiving data dump..."
FileUtils.cd(File.dirname(@dump_filename)) do
Discourse::Utils.execute_command(
'tar', '--append', '--dereference', '--file', tar_filename, File.basename(@dump_filename),
failure_message: "Failed to archive data dump."
)
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end
upload_directory = "uploads/" + @current_db
log "Archiving uploads..."
FileUtils.cd(File.join(Rails.root, "public")) do
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if File.directory?(upload_directory)
Discourse::Utils.execute_command(
'tar', '--append', '--dereference', '--warning=no-file-changed', '--file', tar_filename, upload_directory,
failure_message: "Failed to archive uploads."
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)
else
log "No uploads found, skipping archiving uploads..."
end
end
remove_tmp_directory
log "Gzipping archive, this may take a while..."
Discourse::Utils.execute_command('gzip', '-5', tar_filename, failure_message: "Failed to gzip archive.")
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end
def after_create_hook
log "Executing the after_create_hook for the backup..."
backup = Backup.create_from_filename(@backup_filename)
backup.after_create_hook
end
def remove_old
log "Removing old backups..."
Backup.remove_old
end
def notify_user
log "Notifying '#{@user.username}' of the end of the backup..."
status = @success ? :backup_succeeded : :backup_failed
post = SystemMessage.create_from_system_user(@user, status,
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logs: Discourse::Utils.pretty_logs(@logs)
)
if !@success && @user.id == Discourse::SYSTEM_USER_ID
post.topic.invite_group(@user, Group[:admins])
end
post
end
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def clean_up
log "Cleaning stuff up..."
remove_tar_leftovers
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unpause_sidekiq
disable_readonly_mode if Discourse.readonly_mode?
mark_backup_as_not_running
refresh_disk_space
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log "Finished!"
end
def refresh_disk_space
log "Refreshing disk cache..."
DiskSpace.reset_cached_stats
end
def remove_tar_leftovers
log "Removing '.tar' leftovers..."
Dir["#{@archive_directory}/*.tar"].each { |filename| File.delete(filename) }
end
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def remove_tmp_directory
log "Removing tmp '#{@tmp_directory}' directory..."
FileUtils.rm_rf(@tmp_directory) if Dir[@tmp_directory].present?
rescue
log "Something went wrong while removing the following tmp directory: #{@tmp_directory}"
end
def unpause_sidekiq
log "Unpausing sidekiq..."
Sidekiq.unpause!
rescue
log "Something went wrong while unpausing Sidekiq."
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end
def disable_readonly_mode
return if @readonly_mode_was_enabled
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log "Disabling readonly mode..."
Discourse.disable_readonly_mode
end
def mark_backup_as_not_running
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log "Marking backup as finished..."
BackupRestore.mark_as_not_running!
end
def ensure_directory_exists(directory)
log "Making sure '#{directory}' exists..."
FileUtils.mkdir_p(directory)
end
def log(message)
timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
puts(message)
publish_log(message, timestamp)
save_log(message, timestamp)
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end
def publish_log(message, timestamp)
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return unless @publish_to_message_bus
data = { timestamp: timestamp, operation: "backup", message: message }
MessageBus.publish(BackupRestore::LOGS_CHANNEL, data, user_ids: [@user_id], client_ids: [@client_id])
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end
def save_log(message, timestamp)
@logs << "[#{timestamp}] #{message}"
end
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end
end