73 lines
2.1 KiB
Ruby
73 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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# Checks if a set of migrations requires downtime or not.
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class DowntimeCheck
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# The constant containing the boolean that indicates if downtime is needed
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# or not.
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DOWNTIME_CONST = :DOWNTIME
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# The constant that specifies the reason for the migration requiring
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# downtime.
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DOWNTIME_REASON_CONST = :DOWNTIME_REASON
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# Checks the given migration paths and returns an Array of
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# `Gitlab::DowntimeCheck::Message` instances.
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#
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# migrations - The migration file paths to check.
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def check(migrations)
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migrations.map do |path|
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require(path)
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migration_class = class_for_migration_file(path)
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unless migration_class.const_defined?(DOWNTIME_CONST)
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raise "The migration in #{path} does not specify if it requires " \
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"downtime or not"
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end
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if online?(migration_class)
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Message.new(path)
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else
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reason = downtime_reason(migration_class)
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unless reason
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raise "The migration in #{path} requires downtime but no reason " \
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"was given"
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end
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Message.new(path, true, reason)
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end
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end
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end
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# Checks the given migrations and prints the results to STDOUT/STDERR.
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#
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# migrations - The migration file paths to check.
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def check_and_print(migrations)
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check(migrations).each do |message|
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puts message.to_s # rubocop: disable Rails/Output
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end
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end
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# Returns the class for the given migration file path.
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def class_for_migration_file(path)
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File.basename(path, File.extname(path)).split('_', 2).last.camelize
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.constantize
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end
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# Returns true if the given migration can be performed without downtime.
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def online?(migration)
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migration.const_get(DOWNTIME_CONST, false) == false
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end
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# Returns the downtime reason, or nil if none was defined.
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def downtime_reason(migration)
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if migration.const_defined?(DOWNTIME_REASON_CONST)
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migration.const_get(DOWNTIME_REASON_CONST, false)
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else
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nil
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end
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end
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end
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end
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