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swarm-derive: Add prelude configuration option to NetworkBehaviour macro (#3055)

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Currently, our `NetworkBehaviour` derive macro depends on the `libp2p` crate to be in scope. This prevents standalone usage which forces us to depend on `libp2p` in all our tests where we want to derive a `NetworkBehaviour`.

This PR introduces a `prelude` option that - by default - points to `libp2p::swarm::derive_prelude`, a new module added to `libp2p_swarm`. With this config option, users of `libp2p_swarm` can now refer to the macro without depending on `libp2p`, breaking the circular dependency in our workspace. For consistency with the ecosystem, the macro is now also re-exported by `libp2p_swarm` instead of `libp2p` at the same position as the trait that it implements.

Lastly, we introduce an off-by-default `macros` feature flag that shrinks the dependency tree for users that don't need the derive macro.
This commit is contained in:
Thomas Eizinger
2022-11-13 10:59:14 +11:00
committed by GitHub
parent c32f03c317
commit afb777e937
31 changed files with 211 additions and 132 deletions
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4
examples/ping.rs
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@ -41,8 +41,8 @@
//! and begin pinging each other.
use futures::prelude::*;
use libp2p::swarm::{Swarm, SwarmEvent};
use libp2p::{identity, ping, Multiaddr, NetworkBehaviour, PeerId};
use libp2p::swarm::{NetworkBehaviour, Swarm, SwarmEvent};
use libp2p::{identity, ping, Multiaddr, PeerId};
use libp2p_swarm::keep_alive;
use std::error::Error;