Cache results of wrapped function, returning the last known-good result, if available. Configurable expiration times may be set, with a default of one-day. The recorded items have an identity key derived from: - function name - function arguments - function keyword arguments All arguments to the wrapped function must be representable via repr(). The arguments must be represented in an uniquely identifiable and repeatable manner to ensure accuracy and prevent collisions. Note that this current implementation is not optimized for performance. The database is opened and closed on-demand which carries a cost. It could be updated to keep the database open across the lifetime of the process, but that may complicate usage with multiple processes (e.g. snapcraftctl). For our current use cases, this is the safe and appropriate default. Signed-off-by: Chris Patterson <chris.patterson@canonical.com> - [ ] Have you followed the [guidelines for contributing](https://github.com/snapcore/snapcraft/blob/master/CONTRIBUTING.md)? - [ ] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [ ] Have you successfully run `./runtests.sh static`? - [ ] Have you successfully run `./runtests.sh tests/unit`? -----