106 lines
3.8 KiB
Ruby
106 lines
3.8 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Pagination
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class OffsetPagination < Base
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attr_reader :request_context
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delegate :params, :header, :request, to: :request_context
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def initialize(request_context)
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@request_context = request_context
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end
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def paginate(relation, exclude_total_headers: false)
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paginate_with_limit_optimization(add_default_order(relation)).tap do |data|
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add_pagination_headers(data, exclude_total_headers)
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end
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end
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private
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def paginate_with_limit_optimization(relation)
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# do not paginate relation if it is already paginated
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pagination_data = if relation.respond_to?(:current_page) && relation.current_page == params[:page] && relation.limit_value == params[:per_page]
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relation
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else
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relation.page(params[:page]).per(params[:per_page])
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end
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return pagination_data unless pagination_data.is_a?(ActiveRecord::Relation)
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return pagination_data unless Feature.enabled?(:api_kaminari_count_with_limit, type: :ops)
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limited_total_count = pagination_data.total_count_with_limit
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if limited_total_count > Kaminari::ActiveRecordRelationMethods::MAX_COUNT_LIMIT
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# The call to `total_count_with_limit` memoizes `@arel` because of a call to `references_eager_loaded_tables?`
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# We need to call `reset` because `without_count` relies on `@arel` being unmemoized
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pagination_data.reset.without_count
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else
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pagination_data
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end
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end
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def add_default_order(relation)
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if relation.is_a?(ActiveRecord::Relation) && relation.order_values.empty?
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relation = relation.order(:id) # rubocop: disable CodeReuse/ActiveRecord
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end
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relation
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end
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def add_pagination_headers(paginated_data, exclude_total_headers)
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header 'X-Per-Page', paginated_data.limit_value.to_s
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header 'X-Page', paginated_data.current_page.to_s
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header 'X-Next-Page', paginated_data.next_page.to_s
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header 'X-Prev-Page', paginated_data.prev_page.to_s
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header 'Link', pagination_links(paginated_data)
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return if exclude_total_headers || data_without_counts?(paginated_data)
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header 'X-Total', paginated_data.total_count.to_s
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header 'X-Total-Pages', total_pages(paginated_data).to_s
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end
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def pagination_links(paginated_data)
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[].tap do |links|
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links << %(<#{page_href(page: paginated_data.prev_page)}>; rel="prev") if paginated_data.prev_page
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links << %(<#{page_href(page: paginated_data.next_page)}>; rel="next") if paginated_data.next_page
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links << %(<#{page_href(page: 1)}>; rel="first")
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links << %(<#{page_href(page: total_pages(paginated_data))}>; rel="last") unless data_without_counts?(paginated_data)
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end.join(', ')
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end
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def total_pages(paginated_data)
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# Ensure there is in total at least 1 page
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[paginated_data.total_pages, 1].max
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end
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def data_without_counts?(paginated_data)
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paginated_data.is_a?(Kaminari::PaginatableWithoutCount)
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end
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def base_request_uri
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@base_request_uri ||= URI.parse(request.url).tap do |uri|
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uri.host = Gitlab.config.gitlab.host
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uri.port = Gitlab.config.gitlab.port
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end
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end
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def build_page_url(query_params:)
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base_request_uri.tap do |uri|
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uri.query = query_params
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end.to_s
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end
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def page_href(next_page_params = {})
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query_params = params.merge(**next_page_params, per_page: per_page).to_query
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build_page_url(query_params: query_params)
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end
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def per_page
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@per_page ||= params[:per_page]
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end
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end
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end
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end
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