Add convenient GossipSync variant constructors

These constructors fill in the missing types for each variant so that
users don't have to turbofish them manually.

diff --git a/lightning-background-processor/src/lib.rs b/lightning-background-processor/src/lib.rs
index 11dca44bbab3d7b5c91585835ddc02ccf4baa393..484439b3907b364dddc3dc2c13bb6c078be2ad0c 100644 (file)
--- a/lightning-background-processor/src/lib.rs
+++ b/lightning-background-processor/src/lib.rs
@@ -137,6 +137,55 @@ where A::Target: chain::Access, L::Target: Logger {
        }
 }
 
+/// (C-not exported) as the bindings concretize everything and have constructors for us
+impl<P: Deref<Target = P2PGossipSync<G, A, L>>, G: Deref<Target = NetworkGraph<L>>, A: Deref, L: Deref>
+       GossipSync<P, &RapidGossipSync<G, L>, G, A, L>
+where
+       A::Target: chain::Access,
+       L::Target: Logger,
+{
+       /// Initializes a new [`GossipSync::P2P`] variant.
+       pub fn p2p(gossip_sync: P) -> Self {
+               GossipSync::P2P(gossip_sync)
+       }
+}
+
+/// (C-not exported) as the bindings concretize everything and have constructors for us
+impl<'a, R: Deref<Target = RapidGossipSync<G, L>>, G: Deref<Target = NetworkGraph<L>>, L: Deref>
+       GossipSync<
+               &P2PGossipSync<G, &'a (dyn chain::Access + Send + Sync), L>,
+               R,
+               G,
+               &'a (dyn chain::Access + Send + Sync),
+               L,
+       >
+where
+       L::Target: Logger,
+{
+       /// Initializes a new [`GossipSync::Rapid`] variant.
+       pub fn rapid(gossip_sync: R) -> Self {
+               GossipSync::Rapid(gossip_sync)
+       }
+}
+
+/// (C-not exported) as the bindings concretize everything and have constructors for us
+impl<'a, L: Deref>
+       GossipSync<
+               &P2PGossipSync<&'a NetworkGraph<L>, &'a (dyn chain::Access + Send + Sync), L>,
+               &RapidGossipSync<&'a NetworkGraph<L>, L>,
+               &'a NetworkGraph<L>,
+               &'a (dyn chain::Access + Send + Sync),
+               L,
+       >
+where
+       L::Target: Logger,
+{
+       /// Initializes a new [`GossipSync::None`] variant.
+       pub fn none() -> Self {
+               GossipSync::None
+       }
+}
+
 /// Decorates an [`EventHandler`] with common functionality provided by standard [`EventHandler`]s.
 struct DecoratingEventHandler<
        'a,