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module Ci
# This class responsible for assigning
# proper pending build to runner on runner API request
class RegisterBuildService
include Gitlab::CurrentSettings
attr_reader :runner
Result = Struct.new(:build, :valid?)
def initialize(runner)
@runner = runner
end
def execute
builds =
if runner.shared?
builds_for_shared_runner
else
builds_for_specific_runner
end
build = builds.find do |build|
runner.can_pick?(build)
end
if build
# In case when 2 runners try to assign the same build, second runner will be declined
# with StateMachines::InvalidTransition or StaleObjectError when doing run! or save method.
build.runner_id = runner.id
build.run!
end
Result.new(build, true)
rescue StateMachines::InvalidTransition, ActiveRecord::StaleObjectError
Result.new(build, false)
end
private
def builds_for_shared_runner
new_builds.
# don't run projects which have not enabled shared runners and builds
joins(:project).where(projects: { shared_runners_enabled: true }).
joins('LEFT JOIN project_features ON ci_builds.gl_project_id = project_features.project_id').
where('project_features.builds_access_level IS NULL or project_features.builds_access_level > 0').
# Implement fair scheduling
# this returns builds that are ordered by number of running builds
# we prefer projects that don't use shared runners at all
joins("LEFT JOIN (#{running_builds_for_shared_runners.to_sql}) AS project_builds ON ci_builds.gl_project_id=project_builds.gl_project_id").
order('COALESCE(project_builds.running_builds, 0) ASC', 'ci_builds.id ASC')
end
def builds_for_specific_runner
new_builds.where(project: runner.projects.with_builds_enabled).order('created_at ASC')
end
def running_builds_for_shared_runners
Ci::Build.running.where(runner: Ci::Runner.shared).
group(:gl_project_id).select(:gl_project_id, 'count(*) AS running_builds')
end
def new_builds
Ci::Build.pending.unstarted
end
def shared_runner_build_limits_feature_enabled?
ENV['DISABLE_SHARED_RUNNER_BUILD_MINUTES_LIMIT'].to_s != 'true'
end
end
end
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