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# frozen_string_literal: true
module Banzai
# Extract references to issuables from multiple documents
# This populates RequestStore cache used in Banzai::ReferenceParser::IssueParser
# and Banzai::ReferenceParser::MergeRequestParser
# Populating the cache should happen before processing documents one-by-one
# so we can avoid N+1 queries problem
class IssuableExtractor
attr_reader :context
ISSUE_REFERENCE_TYPE = '@data-reference-type="issue"'
WORK_ITEM_REFERENCE_TYPE = '@data-reference-type="work_item"'
MERGE_REQUEST_REFERENCE_TYPE = '@data-reference-type="merge_request"'
# context - An instance of Banzai::RenderContext.
def initialize(context)
@context = context
end
# Returns Hash in the form { node => issuable_instance }
def extract(documents)
nodes = documents.flat_map do |document|
document.xpath(query)
end
# The project or group for the issuable might be pending for deletion!
# Filter them out because we don't care about them.
issuables_for_nodes(nodes).select { |node, issuable| issuable.resource_parent }
end
private
def issuables_for_nodes(nodes)
parsers.each_with_object({}) do |parser, result|
result.merge!(parser.records_for_nodes(nodes))
end
end
def parsers
[
Banzai::ReferenceParser::IssueParser.new(context),
Banzai::ReferenceParser::WorkItemParser.new(context),
Banzai::ReferenceParser::MergeRequestParser.new(context)
]
end
def query
%(
descendant-or-self::a[contains(concat(" ", @class, " "), " gfm ")]
[#{reference_types.join(' or ')}]
)
end
def reference_types
[ISSUE_REFERENCE_TYPE, WORK_ITEM_REFERENCE_TYPE, MERGE_REQUEST_REFERENCE_TYPE]
end
end
end
Banzai::IssuableExtractor.prepend_mod_with('Banzai::IssuableExtractor')
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