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module Gitlab
module ImportExport
class ProjectTreeRestorer
def initialize(user:, shared:, project:)
@path = File.join(shared.export_path, 'project.json')
@user = user
@shared = shared
@project = project
end
def restore
begin
json = IO.read(@path)
@tree_hash = ActiveSupport::JSON.decode(json)
rescue => e
Rails.logger.error("Import/Export error: #{e.message}")
raise Gitlab::ImportExport::Error.new('Incorrect JSON format')
end
@project_members = @tree_hash.delete('project_members')
ActiveRecord::Base.no_touching do
create_relations
end
rescue => e
@shared.error(e)
false
end
def restored_project
@restored_project ||= restore_project
end
private
def members_mapper
@members_mapper ||= Gitlab::ImportExport::MembersMapper.new(exported_members: @project_members,
user: @user,
project: restored_project)
end
# Loops through the tree of models defined in import_export.yml and
# finds them in the imported JSON so they can be instantiated and saved
# in the DB. The structure and relationships between models are guessed from
# the configuration yaml file too.
# Finally, it updates each attribute in the newly imported project.
def create_relations
saved = []
default_relation_list.each do |relation|
next unless relation.is_a?(Hash) || @tree_hash[relation.to_s].present?
create_sub_relations(relation, @tree_hash) if relation.is_a?(Hash)
relation_key = relation.is_a?(Hash) ? relation.keys.first : relation
relation_hash_list = @tree_hash[relation_key.to_s]
next unless relation_hash_list
relation_hash = create_relation(relation_key, relation_hash_list)
saved << restored_project.append_or_update_attribute(relation_key, relation_hash)
end
saved.all?
end
def default_relation_list
Gitlab::ImportExport::Reader.new(shared: @shared).tree.reject do |model|
model.is_a?(Hash) && model[:project_members]
end
end
def restore_project
return @project unless @tree_hash
@project.update(project_params)
@project
end
def project_params
@tree_hash.reject do |key, value|
# return params that are not 1 to many or 1 to 1 relations
value.is_a?(Array) || key == key.singularize
end
end
# Given a relation hash containing one or more models and its relationships,
# loops through each model and each object from a model type and
# and assigns its correspondent attributes hash from +tree_hash+
# Example:
# +relation_key+ issues, loops through the list of *issues* and for each individual
# issue, finds any subrelations such as notes, creates them and assign them back to the hash
#
# Recursively calls this method if the sub-relation is a hash containing more sub-relations
def create_sub_relations(relation, tree_hash)
relation_key = relation.keys.first.to_s
return if tree_hash[relation_key].blank?
[tree_hash[relation_key]].flatten.each do |relation_item|
relation.values.flatten.each do |sub_relation|
# We just use author to get the user ID, do not attempt to create an instance.
next if sub_relation == :author
create_sub_relations(sub_relation, relation_item) if sub_relation.is_a?(Hash)
relation_hash, sub_relation = assign_relation_hash(relation_item, sub_relation)
relation_item[sub_relation.to_s] = create_relation(sub_relation, relation_hash) unless relation_hash.blank?
end
end
end
def assign_relation_hash(relation_item, sub_relation)
if sub_relation.is_a?(Hash)
relation_hash = relation_item[sub_relation.keys.first.to_s]
sub_relation = sub_relation.keys.first
else
relation_hash = relation_item[sub_relation.to_s]
end
[relation_hash, sub_relation]
end
def create_relation(relation, relation_hash_list)
relation_array = [relation_hash_list].flatten.map do |relation_hash|
Gitlab::ImportExport::RelationFactory.create(relation_sym: relation.to_sym,
relation_hash: parsed_relation_hash(relation_hash),
members_mapper: members_mapper,
user: @user,
project: restored_project)
end.compact
relation_hash_list.is_a?(Array) ? relation_array : relation_array.first
end
def parsed_relation_hash(relation_hash)
relation_hash.merge!('group_id' => restored_project.group.try(:id), 'project_id' => restored_project.id)
end
end
end
end
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