Exception handling

When using the Python SDK, you should be prepared to handle the following exceptions:

• Any response received by the SDK with a non-2xx HTTP status will be thrown as a ServiceError
• A ValueError will be thrown if you provide invalid parameters to a method call or when setting an attribute. For example:
  • When setting an attribute on a model and that attribute has a constrained set of values, such as lifetime on CreatePublicIpDetails
  • When passing a blank string as the identifier for a get_ operation, such as passing a nil instance_id to get_instance()
• ClientError and its subclasses. These exceptions are raised when there is an error with your configuration file or when using the wait_until() function
  • ConfigFileNotFound
  • InvalidConfig
  • InvalidPrivateKey
  • MissingPrivateKeyPassphrase
  • ProfileNotFound
  • WaitUntilNotSupported
  • MaximumWaitTimeExceeded
• If you use the UploadManager then you should also catch MultipartUploadError
• If you use any of the CompositeOperation classes in the SDK (e.g. ComputeClientCompositeOperations) then you should also catch CompositeOperationError
• The Python SDK uses the Requests library to make calls to Oracle Cloud Infrastructure services but it does not mask or wrap any of the errors originating from this library, so you should also account for these in your code. The exception reference for Requests can be found here and here

Handling HTTP 3xx responses

As a result of the SDK treating responses with a non-2xx HTTP status as a ServiceError the SDK will throw a ServiceError on 3xx responses. This can impact operations which support conditional GETs, such as get_object() and head_object() methods as these can return responses with a HTTP status code of 304 if passed an if_none_match which corresponds to the curent etag of the object or bucket.

In order to account for this, you should catch ServiceError and check its status attribute for the HTTP status code. For example:

import oci

config = oci.config.from_file()
client = oci.object_storage.ObjectStorageClient(config)

try:
    get_object_response = client.get_object('my_namespace', 'my_bucket', 'my_object', if_none_match='some_etag_value')
except oci.exceptions.ServiceError as e:
    if e.status == 304:
        # Object exists but has not been modified (based on the etag value)
        pass
    else:
        raise