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/compute/exception.rb, line 69 def self.raise_exception(response) return if response.code =~ %r^20.$/ begin fault = nil info = nil 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) rescue NameError raise OpenStack::Compute::Exception::Other.new("The server returned status #{response.code}", response.code, response.body) end end