Add Gerrit host support

app/models/hosts/gerrit.rb

@@ -0,0 +1,117 @@
+module Hosts
+  class Gerrit < Base
+    IGNORABLE_EXCEPTIONS = [Faraday::ResourceNotFound, Faraday::ConnectionFailed, Faraday::TimeoutError]
+
+    def self.api_missing_error_class
+      Faraday::ResourceNotFound
+    end
+
+    def icon
+      'git'
+    end
+
+    def url(repository)
+      "#{@host.url.to_s.chomp('/')}/plugins/gitiles/#{CGI.escape(repository.full_name)}"
+    end
+
+    def html_url(repository)
+      url(repository)
+    end
+
+    def raw_url(repository, sha = nil)
+      sha ||= repository.default_branch.presence || 'HEAD'
+      "#{url(repository)}/+/#{CGI.escape(sha)}/"
+    end
+
+    def blob_url(repository, sha = nil)
+      raw_url(repository, sha)
+    end
+
+    def download_url(repository, branch = nil, kind = 'branch')
+      ref = branch.presence || repository.default_branch.presence || 'HEAD'
+      "#{url(repository)}/+archive/#{CGI.escape(ref)}.tar.gz"
+    end
+
+    def fetch_repository(id_or_name, _token = nil)
+      name = id_or_name.to_s
+      resp = api_client.get("/projects/#{CGI.escape(name)}")
+      return nil unless resp.success?
+
+      map_repository_data(gerrit_json(resp.body))
+    rescue *IGNORABLE_EXCEPTIONS
+      nil
+    end
+
+    def map_repository_data(data)
+      {
+        uuid: data['id'] || data['name'],
+        full_name: data['name'] || data['id'],
+        owner: data['parent'],
+        description: data['description'],
+        default_branch: data['branches']&.dig('HEAD') || 'master',
+        fork: false,
+        archived: data['state'] == 'READ_ONLY',
+        private: false,
+        scm: 'git',
+        has_issues: false,
+        has_wiki: false,
+        pull_requests_enabled: false,
+        topics: [],
+        created_at: nil,
+        updated_at: nil,
+        pushed_at: nil,
+        metadata: {
+          state: data['state'],
+          parent: data['parent'],
+          web_links: data['web_links']
+        }.compact
+      }
+    end
+
+    def load_repo_names(limit = 100, prefix = nil)
+      params = { n: limit }
+      params[:p] = prefix if prefix.present?
+      resp = api_client.get('/projects/', params)
+      return [] unless resp.success?
+
+      gerrit_json(resp.body).keys
+    rescue *IGNORABLE_EXCEPTIONS
+      []
+    end
+
+    def crawl_repositories
+      load_repo_names.each { |name| @host.sync_repository(name) }
+    end
+
+    def crawl_repositories_async
+      load_repo_names.each { |name| @host.sync_repository_async(name) }
+    end
+
+    def download_tags(repository)
+      nil
+    end
+
+    def download_releases(repository)
+      nil
+    end
+
+    def host_version
+      resp = api_client.get('/config/server/version')
+      return gerrit_json(resp.body) if resp.success?
+    rescue
+      nil
+    end
+
+    def api_client
+      Faraday.new(@host.url, request: { timeout: 30 }) do |conn|
+        conn.response :raise_error
+      end
+    end
+
+    private
+
+    def gerrit_json(body)
+      JSON.parse(body.to_s.sub(/\A\)\]\}'\n?/, ''))
+    end
+  end
+end

db/seeds.rb

@@ -1,4 +1,8 @@
 default_hosts = [
+  {name: 'gerrit.osmocom.org', url: 'https://gerrit.osmocom.org', kind: 'gerrit'},
+  {name: 'gerrit.cloudera.org', url: 'https://gerrit.cloudera.org', kind: 'gerrit'},
+  {name: 'gerrit.rockbox.org', url: 'https://gerrit.rockbox.org', kind: 'gerrit'},
+  {name: 'review.coreboot.org', url: 'https://review.coreboot.org', kind: 'gerrit'},
   {name: 'GitHub', url: 'https://github.com', kind: 'github'},
   {name: 'GitLab.com', url: 'https://gitlab.com', kind: 'gitlab'},
   {name: 'Bitbucket.org', url: 'https://bitbucket.org', kind: 'bitbucket'},

test/models/gerrit_test.rb

@@ -0,0 +1,40 @@
+require "test_helper"
+
+class GerritTest < ActiveSupport::TestCase
+  setup do
+    @host = Host.new(name: 'Coreboot Gerrit', url: 'https://review.coreboot.org', kind: 'gerrit')
+    @gerrit = Hosts::Gerrit.new(@host)
+  end
+
+  test 'maps gerrit project data to repository attributes' do
+    data = {
+      'id' => 'coreboot',
+      'name' => 'coreboot',
+      'parent' => 'All-Projects',
+      'description' => 'coreboot main repository',
+      'state' => 'ACTIVE',
+      'branches' => { 'HEAD' => 'main' },
+      'web_links' => [{ 'name' => 'gitweb', 'url' => 'https://review.coreboot.org/plugins/gitiles/coreboot' }]
+    }
+
+    mapped = @gerrit.map_repository_data(data)
+
+    assert_equal 'coreboot', mapped[:uuid]
+    assert_equal 'coreboot', mapped[:full_name]
+    assert_equal 'All-Projects', mapped[:owner]
+    assert_equal 'coreboot main repository', mapped[:description]
+    assert_equal 'main', mapped[:default_branch]
+    assert_equal 'git', mapped[:scm]
+    assert_equal false, mapped[:has_issues]
+    assert_equal [], mapped[:topics]
+    assert_equal 'ACTIVE', mapped[:metadata][:state]
+  end
+
+  test 'builds gerrit gitiles URLs' do
+    repository = Repository.new(host: @host, full_name: 'coreboot', default_branch: 'main')
+
+    assert_equal 'https://review.coreboot.org/plugins/gitiles/coreboot', @gerrit.url(repository)
+    assert_equal 'https://review.coreboot.org/plugins/gitiles/coreboot/+/main/', @gerrit.raw_url(repository)
+    assert_equal 'https://review.coreboot.org/plugins/gitiles/coreboot/+archive/main.tar.gz', @gerrit.download_url(repository)
+  end
+end