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module Ci
# This class responsible for assigning
# proper pending build to runner on runner API request
class RegisterBuildService
def execute(current_runner)
builds = Ci::Build.pending.unstarted
builds =
if current_runner.shared?
builds.
# don't run projects which have not enabled shared runners
joins(:project).where(projects: { builds_enabled: true, shared_runners_enabled: true }).
# 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')
else
# do run projects which are only assigned to this runner (FIFO)
builds.where(project: current_runner.projects.where(builds_enabled: true)).order('created_at ASC')
end
build = builds.find do |build|
current_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 in run! method.
build.with_lock do
build.runner_id = current_runner.id
build.save!
build.run!
end
end
build
rescue StateMachines::InvalidTransition
nil
end
private
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
end
end
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