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# frozen_string_literal: true
module Prometheus
class ProxyVariableSubstitutionService < BaseService
include Stepable
steps :add_params_to_result, :substitute_ruby_variables
def initialize(environment, params = {})
@environment, @params = environment, params.deep_dup
end
def execute
execute_steps
end
private
def add_params_to_result(result)
result[:params] = params
success(result)
end
def substitute_ruby_variables(result)
return success(result) unless query
# The % operator doesn't replace variables if the hash contains string
# keys.
result[:params][:query] = query % predefined_context.symbolize_keys
success(result)
rescue TypeError, ArgumentError => exception
log_error(exception.message)
Gitlab::Sentry.track_exception(exception, extra: {
template_string: query,
variables: predefined_context
})
error(_('Malformed string'))
end
def predefined_context
@predefined_context ||= Gitlab::Prometheus::QueryVariables.call(@environment)
end
def query
params[:query]
end
end
end
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