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module Ci
##
# We call this service everytime we persist a CI/CD job.
#
# In most cases a job should already have a stage assigned, but in cases it
# doesn't have we need to either find existing one or create a brand new
# stage.
#
class EnsureStageService < BaseService
EnsureStageError = Class.new(StandardError)
def execute(build)
@build = build
return if build.stage_id.present?
return if build.invalid?
ensure_stage.tap do |stage|
build.stage_id = stage.id
yield stage if block_given?
end
end
private
def ensure_stage(attempts: 2)
find_stage || create_stage
rescue ActiveRecord::RecordNotUnique
retry if (attempts -= 1) > 0
raise EnsureStageError, <<~EOS
We failed to find or create a unique pipeline stage after 2 retries.
This should never happen and is most likely the result of a bug in
the database load balancing code.
EOS
end
def find_stage
@build.pipeline.stages.find_by(name: @build.stage)
end
def create_stage
Ci::Stage.create!(name: @build.stage,
pipeline: @build.pipeline,
project: @build.project)
end
end
end
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