GetCausePermanentError returns cause of a permanent error.

Permanent makes the given error a permanent failure that stops the Retry loop immediately.

Retry the given operation until it succeeds, has a permanent failure or times out.

RetryWithContext retries the given operation until it succeeds, has a permanent failure or times out.

WithTimeoutContext retries the given operation with exponential backoff until it succeeds.

WithTimeoutContextAndInterval acts the same as WithTimeoutContext but with constant backoff.

Func is a function to be performed with retry logic.