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module Gitlab
module Prometheus
module AdditionalMetricsParser
CONFIG_ROOT = 'config/prometheus'.freeze
MUTEX = Mutex.new
extend self
def load_groups_from_yaml(file_name = 'additional_metrics.yml')
yaml_metrics_raw(file_name).map(&method(:group_from_entry))
end
private
def validate!(obj)
raise ParsingError.new(obj.errors.full_messages.join('\n')) unless obj.valid?
end
def group_from_entry(entry)
entry[:name] = entry.delete(:group)
entry[:metrics]&.map! do |entry|
Metric.new(entry).tap(&method(:validate!))
end
MetricGroup.new(entry).tap(&method(:validate!))
end
def yaml_metrics_raw(file_name)
load_yaml_file(file_name)&.map(&:deep_symbolize_keys).freeze
end
# rubocop:disable Gitlab/ModuleWithInstanceVariables
def load_yaml_file(file_name)
return YAML.load_file(Rails.root.join(CONFIG_ROOT, file_name)) if Rails.env.development?
MUTEX.synchronize do
@loaded_yaml_cache ||= {}
@loaded_yaml_cache[file_name] ||= YAML.load_file(Rails.root.join(CONFIG_ROOT, file_name))
end
end
# rubocop:enable Gitlab/ModuleWithInstanceVariables
end
end
end
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