67 lines
1.9 KiB
Ruby
67 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module BackupRestore
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MetaDataError = Class.new(RuntimeError)
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MigrationRequiredError = Class.new(RuntimeError)
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class MetaDataHandler
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METADATA_FILE = "meta.json"
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delegate :log, to: :@logger, private: true
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def initialize(logger, filename, tmp_directory)
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@logger = logger
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@current_version = BackupRestore.current_version
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@filename = filename
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@tmp_directory = tmp_directory
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end
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def validate
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metadata = extract_metadata
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if !metadata[:version].is_a?(Integer)
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raise MetaDataError.new("Version is not in a valid format.")
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end
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log "Validating metadata..."
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log " Current version: #{@current_version}"
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log " Restored version: #{metadata[:version]}"
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if metadata[:version] > @current_version
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raise MigrationRequiredError.new(
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"You're trying to restore a more recent version of the schema. " \
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"You should migrate first!",
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)
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end
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metadata
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end
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protected
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# Tries to extract the backup version from an existing
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# metadata file (used in Discourse < v1.6) or from the filename.
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def extract_metadata
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metadata_path = File.join(@tmp_directory, METADATA_FILE) if @tmp_directory.present?
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if metadata_path.present? && File.exist?(metadata_path)
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metadata = load_metadata_file(metadata_path)
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elsif @filename =~ /-#{BackupRestore::VERSION_PREFIX}(\d{14})/
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metadata = { version: Regexp.last_match[1].to_i }
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else
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raise MetaDataError.new("Migration version is missing from the filename.")
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end
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metadata
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end
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def load_metadata_file(path)
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metadata = JSON.parse(File.read(path), symbolize_names: true)
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raise MetaDataError.new("Failed to load metadata file.") if metadata.blank?
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metadata
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rescue JSON::ParserError
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raise MetaDataError.new("Failed to parse metadata file.")
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end
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end
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end
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