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|
# frozen_string_literal: true
module Ci
# Takes in input a Ci::Bridge job and creates a downstream pipeline
# (either multi-project or child pipeline) according to the Ci::Bridge
# specifications.
class CreateDownstreamPipelineService < ::BaseService
include Gitlab::Utils::StrongMemoize
DuplicateDownstreamPipelineError = Class.new(StandardError)
MAX_NESTED_CHILDREN = 2
def execute(bridge)
@bridge = bridge
if bridge.has_downstream_pipeline?
Gitlab::ErrorTracking.track_exception(
DuplicateDownstreamPipelineError.new,
bridge_id: @bridge.id, project_id: @bridge.project_id
)
return error('Already has a downstream pipeline')
end
pipeline_params = @bridge.downstream_pipeline_params
target_ref = pipeline_params.dig(:target_revision, :ref)
return error('Pre-conditions not met') unless ensure_preconditions!(target_ref)
service = ::Ci::CreatePipelineService.new(
pipeline_params.fetch(:project),
current_user,
pipeline_params.fetch(:target_revision))
downstream_pipeline = service
.execute(pipeline_params.fetch(:source), **pipeline_params[:execute_params])
.payload
downstream_pipeline.tap do |pipeline|
update_bridge_status!(@bridge, pipeline)
end
end
private
def update_bridge_status!(bridge, pipeline)
Gitlab::OptimisticLocking.retry_lock(bridge, name: 'create_downstream_pipeline_update_bridge_status') do |subject|
if pipeline.created_successfully?
# If bridge uses `strategy:depend` we leave it running
# and update the status when the downstream pipeline completes.
subject.success! unless subject.dependent?
else
subject.options[:downstream_errors] = pipeline.errors.full_messages
subject.drop!(:downstream_pipeline_creation_failed)
end
end
rescue StateMachines::InvalidTransition => e
Gitlab::ErrorTracking.track_exception(
Ci::Bridge::InvalidTransitionError.new(e.message),
bridge_id: bridge.id,
downstream_pipeline_id: pipeline.id)
end
def ensure_preconditions!(target_ref)
unless downstream_project_accessible?
@bridge.drop!(:downstream_bridge_project_not_found)
return false
end
# TODO: Remove this condition if favour of model validation
# https://gitlab.com/gitlab-org/gitlab/issues/38338
if downstream_project == project && !@bridge.triggers_child_pipeline?
@bridge.drop!(:invalid_bridge_trigger)
return false
end
# TODO: Remove this condition if favour of model validation
# https://gitlab.com/gitlab-org/gitlab/issues/38338
# only applies to parent-child pipelines not multi-project
if has_max_nested_children?
@bridge.drop!(:reached_max_descendant_pipelines_depth)
return false
end
unless can_create_downstream_pipeline?(target_ref)
@bridge.drop!(:insufficient_bridge_permissions)
return false
end
if has_cyclic_dependency?
@bridge.drop!(:pipeline_loop_detected)
return false
end
true
end
def downstream_project_accessible?
downstream_project.present? &&
can?(current_user, :read_project, downstream_project)
end
def can_create_downstream_pipeline?(target_ref)
can?(current_user, :update_pipeline, project) &&
can?(current_user, :create_pipeline, downstream_project) &&
can_update_branch?(target_ref)
end
def can_update_branch?(target_ref)
::Gitlab::UserAccess.new(current_user, container: downstream_project).can_update_branch?(target_ref)
end
def downstream_project
strong_memoize(:downstream_project) do
@bridge.downstream_project
end
end
def has_cyclic_dependency?
return false if @bridge.triggers_child_pipeline?
pipeline_checksums = @bridge.pipeline.self_and_upstreams.filter_map do |pipeline|
config_checksum(pipeline) unless pipeline.child?
end
# To avoid false positives we allow 1 cycle in the ancestry and
# fail when 2 cycles are detected: A -> B -> A -> B -> A
pipeline_checksums.tally.any? { |_checksum, occurrences| occurrences > 2 }
end
def has_max_nested_children?
return false unless @bridge.triggers_child_pipeline?
# only applies to parent-child pipelines not multi-project
ancestors_of_new_child = @bridge.pipeline.self_and_ancestors
ancestors_of_new_child.count > MAX_NESTED_CHILDREN
end
def config_checksum(pipeline)
[pipeline.project_id, pipeline.ref, pipeline.source].hash
end
end
end
|
