gitlab-org--gitlab-foss/lib/api/helpers/pagination_strategies.rb

55 lines
1.8 KiB
Ruby

# frozen_string_literal: true
module API
module Helpers
module PaginationStrategies
def paginate_with_strategies(relation, request_scope)
paginator = paginator(relation, request_scope)
yield(paginator.paginate(relation)).tap do |records, _|
paginator.finalize(records)
end
end
def paginator(relation, request_scope = nil)
return keyset_paginator(relation) if keyset_pagination_enabled?
offset_paginator(relation, request_scope)
end
private
def keyset_paginator(relation)
request_context = Gitlab::Pagination::Keyset::RequestContext.new(self)
unless Gitlab::Pagination::Keyset.available?(request_context, relation)
return error!('Keyset pagination is not yet available for this type of request', 405)
end
Gitlab::Pagination::Keyset::Pager.new(request_context)
end
def offset_paginator(relation, request_scope)
offset_limit = limit_for_scope(request_scope)
if Gitlab::Pagination::Keyset.available_for_type?(relation) && offset_limit_exceeded?(offset_limit)
return error!("Offset pagination has a maximum allowed offset of #{offset_limit} " \
"for requests that return objects of type #{relation.klass}. " \
"Remaining records can be retrieved using keyset pagination.", 405)
end
Gitlab::Pagination::OffsetPagination.new(self)
end
def keyset_pagination_enabled?
params[:pagination] == 'keyset'
end
def limit_for_scope(scope)
(scope || Plan.default).actual_limits.offset_pagination_limit
end
def offset_limit_exceeded?(offset_limit)
offset_limit > 0 && params[:page] * params[:per_page] > offset_limit
end
end
end
end