Add json API for struct route_exclusion

To be able to write a route_exclusion to a json stream.

Changelog-None.

Signed-off-by: Lagrang3 <lagrang3@protonmail.com>

common/json_stream.c

@@ -19,6 +19,7 @@
 #include <common/json_parse.h>
 #include <common/json_stream.h>
 #include <common/node_id.h>
+#include <common/route.h>
 #include <common/wireaddr.h>
 #include <inttypes.h>
 #include <stdio.h>
@@ -494,6 +495,17 @@ void json_add_short_channel_id_dir(struct json_stream *response,
 			 short_channel_id_outnum(scidd.scid), scidd.dir);
 }
 
+void json_add_route_exclusion(struct json_stream *response,
+			      const char *fieldname,
+			      const struct route_exclusion *ex)
+{
+	if (ex->type == EXCLUDE_NODE)
+		json_add_node_id(response, fieldname, &ex->u.node_id);
+	else
+		json_add_short_channel_id_dir(response, fieldname,
+					      ex->u.chan_id);
+}
+
 static void json_add_address_fields(struct json_stream *response,
 				    const struct wireaddr *addr,
 				    const char *typefield)

common/json_stream.h

@@ -36,6 +36,7 @@ struct wally_psbt;
 struct lease_rates;
 struct wireaddr;
 struct wireaddr_internal;
+struct route_exclusion;
 
 struct json_stream {
 	struct json_out *jout;
@@ -301,6 +302,12 @@ void json_add_channel_id(struct json_stream *response,
 			 const char *fieldname,
 			 const struct channel_id *cid);
 
+/* '"fieldname" : <value>' or "<value>" if fieldname is NULL, where <value> is
+ * either a node_id or a short_channel_id_dir. */
+void json_add_route_exclusion(struct json_stream *response,
+			      const char *fieldname,
+			      const struct route_exclusion *ex);
+
 /* '"fieldname" : <hexrev>' or "<hexrev>" if fieldname is NULL */
 void json_add_txid(struct json_stream *result, const char *fieldname,
 		   const struct bitcoin_txid *txid);