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# frozen_string_literal: true
require 'digest/md5'
MESSAGE = <<MARKDOWN
## Reviewer roulette
Changes that require review have been detected! A merge request is normally
reviewed by both a reviewer and a maintainer in its primary category (e.g.
~frontend or ~backend), and by a maintainer in all other categories.
MARKDOWN
CATEGORY_TABLE_HEADER = <<MARKDOWN
To spread load more evenly across eligible reviewers, Danger has randomly picked
a candidate for each review slot. Feel free to override this selection if you
think someone else would be better-suited, or the chosen person is unavailable.
To read more on how to use the reviewer roulette, please take a look at the
[Engineering workflow](https://about.gitlab.com/handbook/engineering/workflow/#basics)
and [code review guidelines](https://docs.gitlab.com/ee/development/code_review.html).
Once you've decided who will review this merge request, mention them as you
normally would! Danger does not (yet?) automatically notify them for you.
| Category | Reviewer | Maintainer |
| -------- | -------- | ---------- |
MARKDOWN
UNKNOWN_FILES_MESSAGE = <<MARKDOWN
These files couldn't be categorised, so Danger was unable to suggest a reviewer.
Please consider creating a merge request to
[add support](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/danger/helper.rb)
for them.
MARKDOWN
NO_REVIEWER = 'No reviewer available'.freeze
NO_MAINTAINER = 'No maintainer available'.freeze
Spin = Struct.new(:reviewer, :maintainer)
def spin_role_for_category(team, role, project, category)
team.select do |member|
member.public_send("#{role}?", project, category, gitlab.mr_labels) # rubocop:disable GitlabSecurity/PublicSend
end
end
def spin_for_category(team, project, category, branch_name)
reviewers, traintainers, maintainers =
%i[reviewer traintainer maintainer].map do |role|
spin_role_for_category(team, role, project, category)
end
# TODO: take CODEOWNERS into account?
# https://gitlab.com/gitlab-org/gitlab/issues/26723
# Make traintainers have triple the chance to be picked as a reviewer
random = roulette.new_random(branch_name)
reviewer = roulette.spin_for_person(reviewers + traintainers + traintainers, random: random)
maintainer = roulette.spin_for_person(maintainers, random: random)
Spin.new(reviewer, maintainer)
end
def markdown_row_for_category(category, reviewer, maintainer)
"| #{helper.label_for_category(category)} | #{reviewer&.markdown_name || NO_REVIEWER} | #{maintainer&.markdown_name || NO_MAINTAINER} |"
end
changes = helper.changes_by_category
# Ignore any files that are known but uncategorized. Prompt for any unknown files
changes.delete(:none)
categories = changes.keys - [:unknown]
# Ensure to spin for database reviewer/maintainer when ~database is applied (e.g. to review SQL queries)
categories << :database if gitlab.mr_labels.include?('database') && !categories.include?(:database)
# CSS Clean up MRs are reviewed using a slightly different process, so we
# disable the review roulette for such MRs.
if changes.any? && !gitlab.mr_labels.include?('CSS cleanup')
# Strip leading and trailing CE/EE markers
canonical_branch_name =
roulette.canonical_branch_name(gitlab.mr_json['source_branch'])
team =
begin
roulette.project_team(helper.project_name)
rescue => err
warn("Reviewer roulette failed to load team data: #{err.message}")
[]
end
project = helper.project_name
unknown = changes.fetch(:unknown, [])
spin_per_category = categories.each_with_object({}) do |category, memo|
memo[category] = spin_for_category(team, project, category, canonical_branch_name)
end
rows = spin_per_category.map do |category, spin|
reviewer = spin.reviewer
maintainer = spin.maintainer
case category
when :test
if reviewer.nil?
# Fetch an already picked backend reviewer, or pick one otherwise
reviewer = spin_per_category[:backend]&.reviewer || spin_for_category(team, project, :backend, canonical_branch_name).reviewer
end
when :engineering_productivity
if maintainer.nil?
# Fetch an already picked backend maintainer, or pick one otherwise
maintainer = spin_per_category[:backend]&.maintainer || spin_for_category(team, project, :backend, canonical_branch_name).maintainer
end
end
markdown_row_for_category(category, reviewer, maintainer)
end
markdown(MESSAGE)
markdown(CATEGORY_TABLE_HEADER + rows.join("\n")) unless rows.empty?
markdown(UNKNOWN_FILES_MESSAGE + helper.markdown_list(unknown)) unless unknown.empty?
end
|
