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module Ci
# This class responsible for assigning
# proper pending build to runner on runner API request
class RegisterJobService
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
valid = true
builds.find do |build|
next unless runner.can_pick?(build)
begin
# 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!
return Result.new(build, true)
rescue StateMachines::InvalidTransition, ActiveRecord::StaleObjectError
# We are looping to find another build that is not conflicting
# It also indicates that this build can be picked and passed to runner.
# If we don't do it, basically a bunch of runners would be competing for a build
# and thus we will generate a lot of 409. This will increase
# the number of generated requests, also will reduce significantly
# how many builds can be picked by runner in a unit of time.
# In case we hit the concurrency-access lock,
# we still have to return 409 in the end,
# to make sure that this is properly handled by runner.
valid = false
end
end
Result.new(nil, valid)
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.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.project_id=project_builds.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(:project_id).select(: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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