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# frozen_string_literal: true
module Mastodon
module MigrationWarning
WARNING_SECONDS = 10
DEFAULT_WARNING = <<~WARNING_MESSAGE
WARNING: This migration may take a *long* time for large instances.
It will *not* lock tables for any significant time, but it may run
for a very long time. We will pause for #{WARNING_SECONDS} seconds to allow you to
interrupt this migration if you are not ready.
WARNING_MESSAGE
def migration_duration_warning(explanation = nil)
return unless valid_environment?
announce_warning(explanation)
announce_countdown
end
private
def announce_countdown
WARNING_SECONDS.downto(1) do |i|
say "Continuing in #{i} second#{i == 1 ? '' : 's'}...", true
sleep 1
end
end
def valid_environment?
$stdout.isatty && Rails.env.production?
end
def announce_warning(explanation)
announce_message prepare_message(explanation)
end
def announce_message(text)
say ''
text.each_line do |line|
say(line)
end
say ''
end
def prepare_message(explanation)
if explanation.blank?
DEFAULT_WARNING
else
DEFAULT_WARNING + "\n#{explanation}"
end
end
end
end
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