nftables-async

An async version of the helper to run nftables in the nftables crate. Simply add both nftables-async and nftables to your crate, then use the nftables_async::apply_ruleset or nftables_async::get_current_ruleset to perform manipulations. Everything is compatible with the sync helper, even the error types, the functions, however, return "true" async futures.

To provide the asynchronous I/O, an implementation of the Process trait in the crate is needed. Two implementations are provided built-in behind feature gates:

1. TokioProcess using the Tokio stack, enabled via tokio-process feature
2. AsyncProcess using the async-process crate (Smol stack), enabled via async-process feature.

Why not the async helpers in nftables >0.6?

nftables 0.6.0 introduced tokio and async-process features that are mostly equivalent to this crate, however, these have some disadvantages that make nftables-async still relevant:

1. The support in nftables is not implemented via a trait (like nftables_async::Process), meaning third-party extensions for async platforms other than Tokio or the async-* stack are not easily possible.
2. The two features are mutually exclusive, making it impossible to compile an nftables that has both enabled. This breaks the use-case of fcnet, that needs both when enabling multiple runtime features, and is generally inconvenient.