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