76 lines
2.5 KiB
Ruby
76 lines
2.5 KiB
Ruby
module Gitlab
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module Diff
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module FileCollection
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class MergeRequestDiff < Base
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def initialize(merge_request_diff, diff_options:)
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@merge_request_diff = merge_request_diff
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super(merge_request_diff,
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project: merge_request_diff.project,
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diff_options: diff_options,
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diff_refs: merge_request_diff.diff_refs)
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end
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def diff_files
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super.tap { |_| store_highlight_cache }
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end
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private
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# Extracted method to highlight in the same iteration to the diff_collection.
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def decorate_diff!(diff)
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diff_file = super
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cache_highlight!(diff_file) if cacheable?(diff_file)
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diff_file
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end
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def highlight_diff_file_from_cache!(diff_file, cache_diff_lines)
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diff_file.highlighted_diff_lines = cache_diff_lines.map do |line|
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Gitlab::Diff::Line.init_from_hash(line)
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end
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end
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#
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# If we find the highlighted diff files lines on the cache we replace existing diff_files lines (no highlighted)
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# for the highlighted ones, so we just skip their execution.
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# If the highlighted diff files lines are not cached we calculate and cache them.
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#
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# The content of the cache is a Hash where the key identifies the file and the values are Arrays of
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# hashes that represent serialized diff lines.
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#
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def cache_highlight!(diff_file)
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item_key = diff_file.file_identifier
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if highlight_cache[item_key]
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highlight_diff_file_from_cache!(diff_file, highlight_cache[item_key])
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else
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highlight_cache[item_key] = diff_file.highlighted_diff_lines.map(&:to_hash)
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end
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end
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def highlight_cache
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return @highlight_cache if defined?(@highlight_cache)
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@highlight_cache = Rails.cache.read(cache_key) || {}
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@highlight_cache_was_empty = @highlight_cache.empty?
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@highlight_cache
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end
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def store_highlight_cache
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Rails.cache.write(cache_key, highlight_cache) if @highlight_cache_was_empty
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end
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def cacheable?(diff_file)
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@merge_request_diff.present? &&
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diff_file.blob &&
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diff_file.blob.text? &&
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@project.repository.diffable?(diff_file.blob)
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end
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def cache_key
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[@merge_request_diff, 'highlighted-diff-files', diff_options]
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end
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end
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end
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end
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end
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