func Annotate(err error, msg string) error
Annotate prepends msg to the error message in err, attempting to preserve other information in err, like an error code.
Annotate panics if err is nil.
Annotate knows about these error types: - "google.golang.org/grpc/status".Status - "google.golang.org/api/googleapi".Error If the error is not one of these types, Annotate behaves like
fmt.Errorf("%s: %v", msg, err)
func Annotatef(err error, format string, args ...interface{}) error
Annotatef uses format and args to format a string, then calls Annotate.
func Retry(ctx context.Context, bo gax.Backoff, f func() (stop bool, err error)) error
Retry calls the supplied function f repeatedly according to the provided backoff parameters. It returns when one of the following occurs: When f's first return value is true, Retry immediately returns with f's second return value. When the provided context is done, Retry returns with an error that includes both ctx.Error() and the last error returned by f.
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