rs: Refine lib.rs checking for server flag

The `cfg-if` macro allows us to organise feature flag related
exports in a more concise way.

Signed-off-by: Peter Neuroth <pet.v.ne@gmail.com>

Author: nepet

Cargo.lock

@@ -15,20 +15,21 @@ server = ["cln-rpc"]
 [dependencies]
 anyhow = "1.0"
 log = "0.4"
-cln-rpc = { path="../cln-rpc/", version = "0.4", optional = true }
+cln-rpc = { path = "../cln-rpc/", version = "0.4", optional = true }
+cfg-if = "1.0"
 serde = { version = "1.0", features = ["derive"] }
 tonic = { version = "0.11", features = ["tls", "transport"] }
 prost = "0.12"
 hex = "0.4.3"
-bitcoin = { version = "0.31", features = [ "serde" ] }
+bitcoin = { version = "0.31", features = ["serde"] }
 tokio-stream = { version = "0.1.14", features = ["sync"] }
 tokio = { version = "1.36.0", features = ["sync"] }
 futures-core = "0.3.30"
 tokio-util = "0.7.10"
 
 [dev-dependencies]
 serde_json = "1.0.72"
-cln-rpc = { path="../cln-rpc/", version = "0.4" }
+cln-rpc = { path = "../cln-rpc/", version = "0.4" }
 
 [build-dependencies]
 tonic-build = "0.11"

cln-grpc/Cargo.toml

@@ -1,15 +1,15 @@
 // Huge json!() macros require lots of recursion
 #![recursion_limit = "1024"]
 
-#[cfg(feature = "server")]
-mod convert;
 pub mod pb;
 
-#[cfg(feature = "server")]
-mod server;
-
-#[cfg(feature = "server")]
-pub use crate::server::Server;
+cfg_if::cfg_if! {
+    if #[cfg(feature = "server")] {
+        mod convert;
+        mod server;
+        pub use server::Server;
+    }
+}
 
 #[cfg(test)]
 mod test;