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# frozen_string_literal: true
module MergeRequests
class MergeabilityCheckService < ::BaseService
include Gitlab::Utils::StrongMemoize
delegate :project, to: :@merge_request
delegate :repository, to: :project
def initialize(merge_request)
@merge_request = merge_request
end
# Updates the MR merge_status. Whenever it switches to a can_be_merged state,
# the merge-ref is refreshed.
#
# Returns a ServiceResponse indicating merge_status is/became can_be_merged
# and the merge-ref is synced. Success in case of being/becoming mergeable,
# error otherwise.
def execute
return ServiceResponse.error(message: 'Invalid argument') unless merge_request
return ServiceResponse.error(message: 'Unsupported operation') if Gitlab::Database.read_only?
update_merge_status
unless merge_request.can_be_merged?
return ServiceResponse.error(message: 'Merge request is not mergeable')
end
unless payload.fetch(:merge_ref_head)
return ServiceResponse.error(message: 'Merge ref was not found')
end
ServiceResponse.success(payload: payload)
end
private
attr_reader :merge_request
def payload
strong_memoize(:payload) do
{
merge_ref_head: merge_ref_head_payload
}
end
end
def merge_ref_head_payload
commit = merge_request.merge_ref_head
return unless commit
target_id, source_id = commit.parent_ids
{
commit_id: commit.id,
source_id: source_id,
target_id: target_id
}
end
def update_merge_status
return unless merge_request.recheck_merge_status?
if can_git_merge?
merge_to_ref && merge_request.mark_as_mergeable
else
merge_request.mark_as_unmergeable
end
end
def can_git_merge?
!merge_request.broken? && repository.can_be_merged?(merge_request.diff_head_sha, merge_request.target_branch)
end
def merge_to_ref
result = MergeRequests::MergeToRefService.new(project, merge_request.author).execute(merge_request)
result[:status] == :success
end
end
end
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