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# frozen_string_literal: true
module Ci
class ResourceGroup < Ci::ApplicationRecord
belongs_to :project, inverse_of: :resource_groups
has_many :resources, class_name: 'Ci::Resource', inverse_of: :resource_group
has_many :processables, class_name: 'Ci::Processable', inverse_of: :resource_group
validates :key,
length: { maximum: 255 },
format: { with: Gitlab::Regex.environment_name_regex,
message: Gitlab::Regex.environment_name_regex_message }
before_create :ensure_resource
enum process_mode: {
unordered: 0,
oldest_first: 1,
newest_first: 2
}
##
# NOTE: This is concurrency-safe method that the subquery in the `UPDATE`
# works as explicit locking.
def assign_resource_to(processable)
resources.free.limit(1).update_all(build_id: processable.id) > 0
end
def release_resource_from(processable)
resources.retained_by(processable).update_all(build_id: nil) > 0
end
def upcoming_processables
if unordered?
processables.waiting_for_resource
elsif oldest_first?
processables.waiting_for_resource_or_upcoming
.order(Arel.sql("commit_id ASC, #{sort_by_job_status}"))
elsif newest_first?
processables.waiting_for_resource_or_upcoming
.order(Arel.sql("commit_id DESC, #{sort_by_job_status}"))
else
Ci::Processable.none
end
end
private
# In order to avoid deadlock, we do NOT specify the job execution order in the same pipeline.
# The system processes wherever ready to transition to `pending` status from `waiting_for_resource`.
# See https://gitlab.com/gitlab-org/gitlab/-/issues/202186 for more information.
def sort_by_job_status
<<~SQL
CASE status
WHEN 'waiting_for_resource' THEN 0
ELSE 1
END ASC
SQL
end
def ensure_resource
# Currently we only support one resource per group, which means
# maximum one build can be set to the resource group, thus builds
# belong to the same resource group are executed once at time.
self.resources.build if self.resources.empty?
end
end
end
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