pytest: Test the rust bindings from cln-rpc

Makefile

@@ -422,7 +422,7 @@ else
 endif
 endif
 
-pytest: $(ALL_PROGRAMS) $(ALL_TEST_PROGRAMS)
+pytest: $(ALL_PROGRAMS) $(DEFAULT_TARGETS) $(ALL_TEST_PROGRAMS)
 ifeq ($(PYTEST),)
 	@echo "py.test is required to run the integration tests, please install using 'pip3 install -r requirements.txt', and rerun 'configure'."
 	exit 1

cln-rpc/Cargo.toml

@@ -3,6 +3,10 @@ name = "cln-rpc"
 version = "0.1.0"
 edition = "2021"
 
+[[example]]
+name = "cln-rpc-getinfo"
+path = "examples/getinfo.rs"
+
 [dependencies]
 anyhow = "1.0.51"
 bytes = "1.1.0"

cln-rpc/Makefile

@@ -1,7 +1,7 @@
 cln-rpc-wrongdir:
 	$(MAKE) -C .. cln-rpc-all
 
-CLN_RPC_EXAMPLES :=
+CLN_RPC_EXAMPLES := target/debug/examples/cln-rpc-getinfo
 CLN_RPC_GENALL = cln-rpc/src/model.rs
 CLN_RPC_SOURCES = $(shell find cln-rpc -name *.rs) ${CLN_RPC_GENALL}
 JSON_SCHEMA = doc/schemas/*.schema.json

cln-rpc/examples/getinfo.rs

@@ -0,0 +1,18 @@
+use anyhow::Context;
+use cln_rpc::{model::GetinfoRequest, ClnRpc, Request};
+use log::info;
+use std::env::args;
+use std::path::Path;
+use tokio;
+
+#[tokio::main]
+async fn main() -> Result<(), anyhow::Error> {
+    env_logger::init();
+    let rpc_path = args().nth(1).context("missing argument: socket path")?;
+    let p = Path::new(&rpc_path);
+
+    let mut rpc = ClnRpc::new(p).await?;
+    let response = rpc.call(Request::Getinfo(GetinfoRequest {})).await?;
+    info!("{}", serde_json::to_string_pretty(&response)?);
+    Ok(())
+}

tests/test_cln_rs.py

@@ -0,0 +1,23 @@
+from fixtures import *  # noqa: F401,F403
+from pathlib import Path
+from pyln.testing.utils import env, TEST_NETWORK
+import subprocess
+import os
+import pytest
+
+
+# Skip the entire module if we don't have Rust.
+pytestmark = pytest.mark.skipif(
+    env('RUST') != '1',
+    reason='RUST is not enabled, skipping rust-dependent tests'
+)
+
+os.environ['RUST_LOG'] = "trace"
+
+
+def test_rpc_client(node_factory):
+    l1 = node_factory.get_node()
+    bin_path = Path.cwd() / "target" / "debug" / "examples" / "cln-rpc-getinfo"
+    rpc_path = Path(l1.daemon.lightning_dir) / TEST_NETWORK / "lightning-rpc"
+    out = subprocess.check_output([bin_path, rpc_path], stderr=subprocess.STDOUT)
+    assert(b'0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518' in out)