lsps: Add client implementation of LSPS0

We want a working client to run some integration tests.

Changelog-Added: lsps-plugin: lsps0 client support

plugins/.gitignore

@@ -20,4 +20,4 @@ cln-askrene
 recklessrpc
 exposesecret
 cln-xpay
-cln-lsps
+cln-lsps-client

plugins/Makefile

@@ -147,8 +147,10 @@ plugins/cln-grpc: target/${RUST_PROFILE}/cln-grpc
 	@cp $< $@
 plugins/clnrest: target/${RUST_PROFILE}/clnrest
 	@cp $< $@
+plugins/cln-lsps-client: target/${RUST_PROFILE}/cln-lsps-client
+	@cp $< $@
 
-PLUGINS += plugins/cln-grpc plugins/clnrest plugins/cln-lsps
+PLUGINS += plugins/cln-grpc plugins/clnrest plugins/cln-lsps-client
 endif
 
 PLUGIN_COMMON_OBJS :=				\
@@ -306,10 +308,12 @@ target/${RUST_PROFILE}/cln-grpc: ${CLN_PLUGIN_SRC} ${CLN_GRPC_PLUGIN_SRC} $(MSGG
 	cargo build ${CARGO_OPTS} --bin cln-grpc
 target/${RUST_PROFILE}/clnrest: ${CLN_REST_PLUGIN_SRC}
 	cargo build ${CARGO_OPTS} --bin clnrest
+target/${RUST_PROFILE}/cln-lsps-client: ${CLN_LSPS_PLUGIN_SRC}
+	cargo build ${CARGO_OPTS} --bin cln-lsps-client
 
 ifneq ($(RUST),0)
 include plugins/rest-plugin/Makefile
-DEFAULT_TARGETS += $(CLN_PLUGIN_EXAMPLES) plugins/cln-grpc plugins/clnrest
+DEFAULT_TARGETS += $(CLN_PLUGIN_EXAMPLES) plugins/cln-grpc plugins/clnrest plugins/cln-lsps-client
 endif
 
 clean: plugins-clean

plugins/lsps-plugin/Cargo.toml

@@ -3,6 +3,10 @@ name = "cln-lsps"
 version = "0.1.0"
 edition = "2021"
 
+[[bin]]
+name = "cln-lsps-client"
+path = "src/client.rs"
+
 [dependencies]
 anyhow = "1.0"
 async-trait = "0.1"

plugins/lsps-plugin/src/client.rs

@@ -0,0 +1,64 @@
+use cln_lsps::jsonrpc::client::JsonRpcClient;
+use cln_lsps::lsps0::{
+    self,
+    transport::{Bolt8Transport, CustomMessageHookManager, WithCustomMessageHookManager},
+};
+use serde::Deserialize;
+use std::path::Path;
+
+#[derive(Clone)]
+struct State {
+    hook_manager: CustomMessageHookManager,
+}
+
+impl WithCustomMessageHookManager for State {
+    fn get_custommsg_hook_manager(&self) -> &CustomMessageHookManager {
+        &self.hook_manager
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), anyhow::Error> {
+    let hook_manager = CustomMessageHookManager::new();
+    let state = State { hook_manager };
+
+    if let Some(plugin) = cln_plugin::Builder::new(tokio::io::stdin(), tokio::io::stdout())
+        .hook("custommsg", CustomMessageHookManager::on_custommsg::<State>)
+        .rpcmethod(
+            "lsps-listprotocols",
+            "list protocols supported by lsp",
+            on_lsps_listprotocols,
+        )
+        .start(state)
+        .await?
+    {
+        plugin.join().await
+    } else {
+        Ok(())
+    }
+}
+
+async fn on_lsps_listprotocols(
+    p: cln_plugin::Plugin<State>,
+    v: serde_json::Value,
+) -> Result<serde_json::Value, anyhow::Error> {
+    #[derive(Deserialize)]
+    struct Request {
+        peer: String,
+    }
+    let dir = p.configuration().lightning_dir;
+    let rpc_path = Path::new(&dir).join(&p.configuration().rpc_file);
+
+    let req: Request = serde_json::from_value(v).unwrap();
+
+    let client = JsonRpcClient::new(Bolt8Transport::new(
+        &req.peer,
+        rpc_path,
+        p.state().hook_manager.clone(),
+        None,
+    )?);
+    let res: lsps0::model::Lsps0listProtocolsResponse = client
+        .call_typed(lsps0::model::Lsps0listProtocolsRequest {})
+        .await?;
+    Ok(serde_json::to_value(res)?)
+}

plugins/lsps-plugin/src/lib.rs

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

plugins/lsps-plugin/src/main.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}