lightningd: add json_add_tx helper.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/json.c

@@ -372,6 +372,13 @@ void json_add_hex_talarr(struct json_stream *result,
 	json_add_hex(result, fieldname, data, tal_bytelen(data));
 }
 
+void json_add_tx(struct json_stream *result,
+		 const char *fieldname,
+		 const struct bitcoin_tx *tx)
+{
+	json_add_hex_talarr(result, fieldname, linearize_tx(tmpctx, tx));
+}
+
 void json_add_escaped_string(struct json_stream *result, const char *fieldname,
 			     const struct json_escaped *esc TAKES)
 {

lightningd/json.h

@@ -16,6 +16,7 @@
 #define JSMN_STRICT 1
 # include <external/jsmn/jsmn.h>
 
+struct bitcoin_tx;
 struct bitcoin_txid;
 struct chainparams;
 struct channel_id;
@@ -153,6 +154,10 @@ void json_add_hex(struct json_stream *result, const char *fieldname,
 void json_add_hex_talarr(struct json_stream *result,
 			 const char *fieldname,
 			 const tal_t *data);
+/* '"fieldname" : "010000000001..."' or "010000000001..." if fieldname is NULL */
+void json_add_tx(struct json_stream *result,
+		 const char *fieldname,
+		 const struct bitcoin_tx *tx);
 
 /* Adds both a 'raw' number field and an 'amount_msat' field */
 void json_add_amount_msat_compat(struct json_stream *result,

lightningd/opening_control.c

@@ -758,9 +758,8 @@ openchannel_hook_serialize(struct openchannel_hook_payload *payload,
 	json_add_num(stream, "max_accepted_htlcs", payload->max_accepted_htlcs);
 	json_add_num(stream, "channel_flags", payload->channel_flags);
 	if (tal_count(payload->shutdown_scriptpubkey) != 0)
-		json_add_hex(stream, "shutdown_scriptpubkey",
-			     payload->shutdown_scriptpubkey,
-			     tal_count(payload->shutdown_scriptpubkey));
+		json_add_hex_talarr(stream, "shutdown_scriptpubkey",
+				    payload->shutdown_scriptpubkey);
 	json_object_end(stream); /* .openchannel */
 }
 

lightningd/peer_control.c

@@ -237,13 +237,12 @@ static void
 resolve_one_close_command(struct close_command *cc, bool cooperative)
 {
 	struct json_stream *result = json_stream_success(cc->cmd);
-	u8 *tx = linearize_tx(result, cc->channel->last_tx);
 	struct bitcoin_txid txid;
 
 	bitcoin_txid(cc->channel->last_tx, &txid);
 
 	json_object_start(result, NULL);
-	json_add_hex_talarr(result, "tx", tx);
+	json_add_tx(result, "tx", cc->channel->last_tx);
 	json_add_txid(result, "txid", &txid);
 	if (cooperative)
 		json_add_string(result, "type", "mutual");
@@ -1501,7 +1500,6 @@ static struct command_result *json_sign_last_tx(struct command *cmd,
 	struct node_id *peerid;
 	struct peer *peer;
 	struct json_stream *response;
-	u8 *linear;
 	struct channel *channel;
 
 	if (!param(cmd, buffer, params,
@@ -1523,13 +1521,13 @@ static struct command_result *json_sign_last_tx(struct command *cmd,
 	response = json_stream_success(cmd);
 	log_debug(channel->log, "dev-sign-last-tx: signing tx with %zu outputs",
 		  channel->last_tx->wtx->num_outputs);
-	sign_last_tx(channel);
-	linear = linearize_tx(cmd, channel->last_tx);
-	remove_sig(channel->last_tx);
 
+	sign_last_tx(channel);
 	json_object_start(response, NULL);
-	json_add_hex_talarr(response, "tx", linear);
+	json_add_tx(response, "tx", channel->last_tx);
 	json_object_end(response);
+	remove_sig(channel->last_tx);
+
 	return command_success(cmd, response);
 }
 

lightningd/test/run-invoice-select-inchan.c

@@ -183,6 +183,11 @@ void json_add_short_channel_id(struct json_stream *response UNNEEDED,
 /* Generated stub for json_add_string */
 void json_add_string(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, const char *value UNNEEDED)
 { fprintf(stderr, "json_add_string called!\n"); abort(); }
+/* Generated stub for json_add_tx */
+void json_add_tx(struct json_stream *result UNNEEDED,
+		 const char *fieldname UNNEEDED,
+		 const struct bitcoin_tx *tx UNNEEDED)
+{ fprintf(stderr, "json_add_tx called!\n"); abort(); }
 /* Generated stub for json_add_txid */
 void json_add_txid(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED,
 		   const struct bitcoin_txid *txid UNNEEDED)

wallet/test/run-wallet.c

@@ -266,6 +266,11 @@ void json_add_string(struct json_stream *result UNNEEDED, const char *fieldname
 void json_add_timeabs(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED,
 		      struct timeabs t UNNEEDED)
 { fprintf(stderr, "json_add_timeabs called!\n"); abort(); }
+/* Generated stub for json_add_tx */
+void json_add_tx(struct json_stream *result UNNEEDED,
+		 const char *fieldname UNNEEDED,
+		 const struct bitcoin_tx *tx UNNEEDED)
+{ fprintf(stderr, "json_add_tx called!\n"); abort(); }
 /* Generated stub for json_add_txid */
 void json_add_txid(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED,
 		   const struct bitcoin_txid *txid UNNEEDED)