In the event of a non-200 HTTP status code, this method takes the HTTP response, parses the JSON from the body to get more information about the exception, then raises the proper error. Note that all exceptions are scoped in the OpenStack::Compute::Exception namespace.
# File lib/openstack/connection.rb, line 456 def self.raise_exception(response) return if response.code =~ /^20.$/ begin fault = nil info = nil if response.body.nil? && response.code == "404" #HEAD ops no body returned exception_class = self.const_get("ItemNotFound") raise exception_class.new("The resource could not be found", "404", "") else JSON.parse(response.body).each_pair do |key, val| fault=key info=val end exception_class = self.const_get(fault[0,1].capitalize+fault[1,fault.length]) raise exception_class.new(info["message"], response.code, response.body) end rescue JSON::ParserError => parse_error deal_with_faulty_error(response, parse_error) rescue NameError raise OpenStack::Exception::Other.new("The server returned status #{response.code}", response.code, response.body) end end
e.g. os.delete(“non-existant”) ==> response.body is:
"404 Not Found\n\nThe resource could not be found.\n\n " which doesn't parse. Deal with such cases here if possible (JSON::ParserError)
# File lib/openstack/connection.rb, line 484 def self.deal_with_faulty_error(response, parse_error) case response.code when "404" klass = self.const_get("ItemNotFound") msg = "The resource could not be found" when "409" klass = self.const_get("ResourceStateConflict") msg = "There was a conflict with the state of the resource" else klass = self.const_get("Other") msg = "Oops - not sure what happened: #{parse_error}" end raise klass.new(msg, response.code.to_s, response.body) end