lsps: Implement the transport layer for lsps0

For lsps0 we send JSON-RPC messages via custom messages over the
lightning network. This commit adds a basic implementation based
on custom messages.

Author: nepet

Cargo.lock

@@ -4,8 +4,10 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+anyhow = "1.0"
 async-trait = "0.1"
-dashmap = "6.1"
+cln-plugin = { version = "0.4", path = "../" }
+cln-rpc = { version = "0.4", path = "../../cln-rpc" }
 hex = "0.4"
 log = "0.4"
 rand = "0.9"

plugins/lsps-plugin/Cargo.toml

@@ -33,6 +33,8 @@ impl Error {
 
 #[derive(Error, Debug)]
 pub enum TransportError {
+    #[error("Timeout")]
+    Timeout,
     #[error("Other error: {0}")]
     Other(String),
 }

plugins/lsps-plugin/src/jsonrpc/mod.rs

@@ -1 +1,2 @@
 mod jsonrpc;
+mod lsps0;

plugins/lsps-plugin/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod model;
+pub mod transport;

plugins/lsps-plugin/src/lsps0/mod.rs

@@ -0,0 +1,15 @@
+use serde::{Deserialize, Serialize};
+
+use crate::jsonrpc::JsonRpcRequest;
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct Lsps0listProtocolsRequest {}
+
+impl JsonRpcRequest for Lsps0listProtocolsRequest {
+    const METHOD: &'static str = "lsps0.list_protocols";
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct Lsps0listProtocolsResponse {
+    pub protocols: Vec<u8>,
+}