From c5b032598ec5d2c45563fe86e829c4cd27e2818e Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Sun, 19 Jun 2022 16:44:11 +0930
Subject: [PATCH] lightningd: fix outgoing IO logging for JSONRPC.

Changelog-Fixed: lightningd: `log-level` `io` shows JSONRPC output, as well as input.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 lightningd/jsonrpc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lightningd/jsonrpc.c b/lightningd/jsonrpc.c
index 0965f193a..4f6761785 100644
--- a/lightningd/jsonrpc.c
+++ b/lightningd/jsonrpc.c
@@ -971,9 +971,14 @@ static struct io_plan *start_json_stream(struct io_conn *conn,
 					 struct json_connection *jcon)
 {
 	/* If something has created an output buffer, start streaming. */
-	if (tal_count(jcon->js_arr))
+	if (tal_count(jcon->js_arr)) {
+		size_t len;
+		const char *p = json_out_contents(jcon->js_arr[0]->jout, &len);
+		if (len)
+			log_io(jcon->log, LOG_IO_OUT, NULL, "", p, len);
 		return json_stream_output(jcon->js_arr[0], conn,
 					  stream_out_complete, jcon);
+	}
 
 	/* Tell reader it can run next command. */
 	io_wake(conn);