implemented net_listening method

rpc/src/v1/impls/net.rs

@@ -42,4 +42,9 @@ impl<S> Net for NetClient<S> where S: SyncProvider + 'static {
 	fn peer_count(&self, _params: Params) -> Result<Value, Error> {
 		Ok(Value::String(format!("0x{:x}", take_weak!(self.sync).status().num_peers as u64).to_owned()))
 	}
+
+	fn is_listening(&self, _: Params) -> Result<Value, Error> {
+		// right now (11 march 2016), we are always listening for incoming connections
+		Ok(Value::Bool(true))
+	}
 }

rpc/src/v1/tests/net.rs

@@ -50,3 +50,19 @@ fn rpc_net_peer_count() {
 
 	assert_eq!(io.handle_request(request), Some(response.to_string()));
 }
+
+#[test]
+fn rpc_net_listening() {
+	let sync = Arc::new(TestSyncProvider::new(Config {
+		protocol_version: 65,
+		num_peers: 120,
+	}));
+	let net = NetClient::new(&sync).to_delegate();
+	let io = IoHandler::new();
+	io.add_delegate(net);
+
+	let request = r#"{"jsonrpc": "2.0", "method": "net_listening", "params": [], "id": 1}"#;
+	let response = r#"{"jsonrpc":"2.0","result":true,"id":1}"#;
+
+	assert_eq!(io.handle_request(request), Some(response.to_string()));
+}