class OpenStack::Exception

OpenStack::Exception

Public Class Methods

raise_exception(response) click to toggle source

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

Private Class Methods

deal_with_faulty_error(response, parse_error) click to toggle source

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