Minor Description
libcloud.common.base.Response constructor is handling failures of provider operations, this way
if not self.success():
raise Exception(self.parse_error())
for eg., in ec2 driver the parse_error method is overridden to handle specific cases like invalid credentials, malformed responses but all other error cases produced by ec2 will be raised as Exception. Its too generic and we need a classification (ProviderError) to capture all the errors generated by a cloud provider.
- libcloud.common.base.Response can use it
if not self.success():
raise ProviderError(self.parse_error())
- specific errors of providers can be derived from it
class InvalidCredsError(ProviderError):
Also drivers that are having provider specific error types (eg., SoftLayerException, LinodeException, HostVirtualException) can be extended from ProviderError. Currently its extending LibcloudError and since LibcloudError is inclusive of all internal stuffs, having a separate type for errors occured at provider side would simplify error handling for libcloud clients.