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# frozen_string_literal: true
module Terraform
class State < ApplicationRecord
include UsageStatistics
HEX_REGEXP = %r{\A\h+\z}.freeze
UUID_LENGTH = 32
belongs_to :project
belongs_to :locked_by_user, class_name: 'User'
has_many :versions,
class_name: 'Terraform::StateVersion',
foreign_key: :terraform_state_id,
inverse_of: :terraform_state
has_one :latest_version, -> { ordered_by_version_desc },
class_name: 'Terraform::StateVersion',
foreign_key: :terraform_state_id,
inverse_of: :terraform_state
scope :versioning_not_enabled, -> { where(versioning_enabled: false) }
scope :ordered_by_name, -> { order(:name) }
validates :project_id, presence: true
validates :uuid, presence: true, uniqueness: true, length: { is: UUID_LENGTH },
format: { with: HEX_REGEXP, message: 'only allows hex characters' }
default_value_for(:uuid, allows_nil: false) { SecureRandom.hex(UUID_LENGTH / 2) }
def latest_file
latest_version&.file
end
def locked?
self.lock_xid.present?
end
def update_file!(data, version:, build:)
# This check is required to maintain backwards compatibility with
# states that were created prior to versioning being supported.
# This can be removed in 14.0 when support for these states is dropped.
# See https://gitlab.com/gitlab-org/gitlab/-/issues/258960
if versioning_enabled?
create_new_version!(data: data, version: version, build: build)
else
migrate_legacy_version!(data: data, version: version, build: build)
end
end
private
##
# If a Terraform state was created before versioning support was
# introduced, it will have a single version record whose file
# uses a legacy naming scheme in object storage. To update
# these states and versions to use the new behaviour, we must do
# the following when creating the next version:
#
# * Read the current, non-versioned file from the old location.
# * Update the :versioning_enabled flag, which determines the
# naming scheme
# * Resave the existing file with the updated name and location,
# using a version number one prior to the new version
# * Create the new version as normal
#
# This migration only needs to happen once for each state, from
# then on the state will behave as if it was always versioned.
#
# The code can be removed in the next major version (14.0), after
# which any states that haven't been migrated will need to be
# recreated: https://gitlab.com/gitlab-org/gitlab/-/issues/258960
def migrate_legacy_version!(data:, version:, build:)
current_file = latest_version.file.read
current_version = parse_serial(current_file) || version - 1
update!(versioning_enabled: true)
reload_latest_version.update!(version: current_version, file: CarrierWaveStringFile.new(current_file))
create_new_version!(data: data, version: version, build: build)
end
def create_new_version!(data:, version:, build:)
new_version = versions.build(version: version, created_by_user: locked_by_user, build: build)
new_version.assign_attributes(file: data)
new_version.save!
end
def parse_serial(file)
Gitlab::Json.parse(file)["serial"]
rescue JSON::ParserError
end
end
end
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