Export the BoxedZebraService type alias.

This gives API consumers a convenient name, and makes the Rustdoc output
significantly cleaner (because `init` can return a `BoxedZebraService`, not a
`Box<dyn ...ManyTypeConstraints.......>`.

zebra-network/src/lib.rs

@@ -56,7 +56,7 @@ mod timestamp_collector;
 pub use config::Config;
 pub use meta_addr::MetaAddr;
 pub use network::Network;
-pub use peer_set::init;
+pub use peer_set::{init, BoxedZebraService};
 pub use protocol::internal::{Request, Response};
 pub use timestamp_collector::TimestampCollector;
 

zebra-network/src/peer_set.rs

@@ -36,7 +36,8 @@ use crate::{
     BoxedStdError,
 };
 
-type BoxedZebraService = Box<
+/// A type alias for a boxed [`tower::Service`] used to process [`Request`]s into [`Response`]s.
+pub type BoxedZebraService = Box<
     dyn Service<
             Request,
             Response = Response,