90 lines
2.9 KiB
Ruby
90 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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# Projects::BranchesByModeService uses Gitaly page-token pagination
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# in order to optimally fetch branches.
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# The drawback of the page-token pagination is that it doesn't provide
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# an option of going to the previous page of the collection.
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# That's why we need to fall back to offset pagination when previous page
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# is requested.
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class Projects::BranchesByModeService
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include Gitlab::Routing
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attr_reader :project, :params
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def initialize(project, params = {})
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@project = project
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@params = params
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end
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def execute
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return fetch_branches_via_gitaly_pagination if use_gitaly_pagination?
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fetch_branches_via_offset_pagination
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end
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private
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def mode
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params[:mode]
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end
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def by_mode(branches)
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return branches unless %w[active stale].include?(mode)
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branches.select { |b| b.state.to_s == mode }
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end
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def use_gitaly_pagination?
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return false if params[:page].present? || params[:search].present?
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Feature.enabled?(:branch_list_keyset_pagination, project)
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end
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def fetch_branches_via_offset_pagination
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branches = BranchesFinder.new(project.repository, params).execute
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branches = Kaminari.paginate_array(by_mode(branches)).page(params[:page])
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branches_with_links(branches, last_page: branches.last_page?)
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end
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def fetch_branches_via_gitaly_pagination
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per_page = Kaminari.config.default_per_page
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options = params.merge(per_page: per_page + 1, page_token: params[:page_token])
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branches = BranchesFinder.new(project.repository, options).execute(gitaly_pagination: true)
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# Branch is stale if it hasn't been updated for 3 months
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# This logic is specified in Gitlab Rails and isn't specified in Gitaly
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# To display stale branches we fetch branches sorted as most-stale-at-the-top
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# If the result contains active branches we filter them out and define that no more stale branches left
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# Same logic applies to fetching active branches
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branches = by_mode(branches)
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last_page = branches.size <= per_page
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branches = branches.take(per_page) # rubocop:disable CodeReuse/ActiveRecord
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branches_with_links(branches, last_page: last_page)
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end
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def branches_with_links(branches, last_page:)
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# To fall back to offset pagination we need to track current page via offset param
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# And increase it whenever we go to the next page
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previous_offset = params[:offset].to_i
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previous_path = nil
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next_path = nil
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return [branches, previous_path, next_path] if branches.blank?
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unless last_page
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next_path = project_branches_filtered_path(project, state: mode, page_token: branches.last.name, sort: params[:sort], offset: previous_offset + 1)
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end
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if previous_offset > 0
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previous_path = project_branches_filtered_path(project, state: mode, sort: params[:sort], page: previous_offset, offset: previous_offset - 1)
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end
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[branches, previous_path, next_path]
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end
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end
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