tools/generate_wire.py: make bitcoin_tx a varlen structs

Now it allocates naturally.

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

lightningd/peer_control.c

@@ -1150,8 +1150,7 @@ static void handle_onchain_broadcast_tx(struct peer *peer, const u8 *msg)
 {
 	struct bitcoin_tx *tx;
 
-	tx = tal(msg, struct bitcoin_tx);
-	if (!fromwire_onchain_broadcast_tx(msg, NULL, tx)) {
+	if (!fromwire_onchain_broadcast_tx(msg, msg, NULL, &tx)) {
 		peer_internal_error(peer, "Invalid onchain_broadcast_tx");
 		return;
 	}
@@ -1581,12 +1580,12 @@ static void opening_got_hsm_funding_sig(struct funding_channel *fc,
 					const struct crypto_state *cs,
 					u64 gossip_index)
 {
-	struct bitcoin_tx *tx = tal(fc, struct bitcoin_tx);
+	struct bitcoin_tx *tx;
 	u8 *linear;
 	u64 change_satoshi;
 	struct json_result *response = new_json_result(fc->cmd);
 
-	if (!fromwire_hsm_sign_funding_reply(resp, NULL, tx))
+	if (!fromwire_hsm_sign_funding_reply(fc, resp, NULL, &tx))
 		fatal("HSM gave bad sign_funding_reply %s",
 		      tal_hex(fc, resp));
 
@@ -1788,9 +1787,9 @@ static bool better_closing_fee(struct peer *peer, const struct bitcoin_tx *tx)
 static void peer_received_closing_signature(struct peer *peer, const u8 *msg)
 {
 	secp256k1_ecdsa_signature sig;
-	struct bitcoin_tx *tx = tal(msg, struct bitcoin_tx);
+	struct bitcoin_tx *tx;
 
-	if (!fromwire_closing_received_signature(msg, NULL, &sig, tx)) {
+	if (!fromwire_closing_received_signature(msg, msg, NULL, &sig, &tx)) {
 		peer_internal_error(peer, "Bad closing_received_signature %s",
 				    tal_hex(peer, msg));
 		return;
@@ -2220,14 +2219,13 @@ static void opening_funder_finished(struct subd *opening, const u8 *resp,
 	/* At this point, we care about peer */
 	fc->peer->channel_info = channel_info
 		= tal(fc->peer, struct channel_info);
-	remote_commit = tal(resp, struct bitcoin_tx);
 
 	/* This is a new channel_info->their_config so set its ID to 0 */
 	fc->peer->channel_info->their_config.id = 0;
 
-	if (!fromwire_opening_funder_reply(resp, NULL,
+	if (!fromwire_opening_funder_reply(resp, resp, NULL,
 					   &channel_info->their_config,
-					   remote_commit,
+					   &remote_commit,
 					   &remote_commit_sig,
 					   &cs,
 					   &gossip_index,
@@ -2340,8 +2338,6 @@ static void opening_fundee_finished(struct subd *opening,
 	log_debug(peer->log, "Got opening_fundee_finish_response");
 	assert(tal_count(fds) == 2);
 
-	remote_commit = tal(reply, struct bitcoin_tx);
-
 	/* At this point, we care about peer */
 	peer->channel_info = channel_info = tal(peer, struct channel_info);
 	/* This is a new channel_info->their_config, set its ID to 0 */
@@ -2350,7 +2346,7 @@ static void opening_fundee_finished(struct subd *opening,
 	peer->funding_txid = tal(peer, struct bitcoin_txid);
 	if (!fromwire_opening_fundee_reply(tmpctx, reply, NULL,
 					   &channel_info->their_config,
-					   remote_commit,
+					   &remote_commit,
 					   &remote_commit_sig,
 					   &cs,
 					   &gossip_index,

lightningd/peer_htlcs.c

@@ -1081,7 +1081,7 @@ void peer_got_commitsig(struct peer *peer, const u8 *msg)
 	struct fulfilled_htlc *fulfilled;
 	struct failed_htlc **failed;
 	struct changed_htlc *changed;
-	struct bitcoin_tx *tx = tal(msg, struct bitcoin_tx);
+	struct bitcoin_tx *tx;
 	size_t i;
 
 	if (!fromwire_channel_got_commitsig(msg, msg, NULL,
@@ -1094,7 +1094,7 @@ void peer_got_commitsig(struct peer *peer, const u8 *msg)
 					    &fulfilled,
 					    &failed,
 					    &changed,
-					    tx)) {
+					    &tx)) {
 		peer_internal_error(peer,
 				    "bad fromwire_channel_got_commitsig %s",
 				    tal_hex(peer, msg));

onchaind/onchain.c

@@ -943,7 +943,7 @@ static void wait_for_resolved(struct tracked_output **outs)
 	while (!all_irrevocably_resolved(outs)) {
 		u8 *msg = wire_sync_read(outs, REQ_FD);
 		struct bitcoin_txid txid;
-		struct bitcoin_tx *tx = tal(msg, struct bitcoin_tx);
+		struct bitcoin_tx *tx;
 		u32 input_num, depth, tx_blockheight;
 		struct preimage preimage;
 
@@ -952,7 +952,7 @@ static void wait_for_resolved(struct tracked_output **outs)
 
 		if (fromwire_onchain_depth(msg, NULL, &txid, &depth))
 			tx_new_depth(outs, &txid, depth);
-		else if (fromwire_onchain_spent(msg, NULL, tx, &input_num,
+		else if (fromwire_onchain_spent(msg, msg, NULL, &tx, &input_num,
 						&tx_blockheight))
 			output_spent(&outs, tx, input_num, tx_blockheight);
 		else if (fromwire_onchain_known_preimage(msg, NULL, &preimage))
@@ -1982,7 +1982,6 @@ int main(int argc, char *argv[])
 	missing_htlc_msgs = tal_arr(ctx, u8 *, 0);
 
 	msg = wire_sync_read(ctx, REQ_FD);
-	tx = tal(ctx, struct bitcoin_tx);
 	if (!fromwire_onchain_init(ctx, msg, NULL,
 				   &seed, &shachain,
 				   &funding_amount_satoshi,
@@ -2001,7 +2000,7 @@ int main(int argc, char *argv[])
 				   &remote_payment_basepoint,
 				   &remote_htlc_basepoint,
 				   &remote_delayed_payment_basepoint,
-				   tx,
+				   &tx,
 				   &tx_blockheight,
 				   &reasonable_depth,
 				   &remote_htlc_sigs,

tools/generate-wire.py

@@ -32,6 +32,7 @@ varlen_structs = [
     'gossip_getnodes_entry',
     'failed_htlc',
     'utxo',
+    'bitcoin_tx',
 ]
 
 class FieldType(object):

wallet/walletrpc.c

@@ -289,9 +289,7 @@ static void json_withdraw(struct command *cmd,
 
 	msg = hsm_sync_read(cmd, cmd->ld);
 
-	tx = tal(withdraw, struct bitcoin_tx);
-
-	if (!fromwire_hsm_sign_withdrawal_reply(msg, NULL, tx))
+	if (!fromwire_hsm_sign_withdrawal_reply(msg, msg, NULL, &tx))
 		fatal("HSM gave bad sign_withdrawal_reply %s",
 		      tal_hex(withdraw, msg));
 

wire/fromwire.c

@@ -225,7 +225,9 @@ void derive_channel_id(struct channel_id *channel_id,
 	channel_id->id[sizeof(*channel_id)-1] ^= txout;
 }
 
-void fromwire_bitcoin_tx(const u8 **cursor, size_t *max, struct bitcoin_tx *tx)
+/* FIXME: Simply rename pull_bitcoin_tx, remove pull_bitcoin_tx_onto */
+struct bitcoin_tx *fromwire_bitcoin_tx(const tal_t *ctx,
+				       const u8 **cursor, size_t *max)
 {
-	pull_bitcoin_tx_onto(tx, cursor, max, tx);
+	return pull_bitcoin_tx(ctx, cursor, max);
 }

wire/wire.h

@@ -87,5 +87,6 @@ void fromwire_pad(const u8 **cursor, size_t *max, size_t num);
 
 void fromwire_u8_array(const u8 **cursor, size_t *max, u8 *arr, size_t num);
 
-void fromwire_bitcoin_tx(const u8 **cursor, size_t *max, struct bitcoin_tx *tx);
+struct bitcoin_tx *fromwire_bitcoin_tx(const tal_t *ctx,
+				       const u8 **cursor, size_t *max);
 #endif /* LIGHTNING_WIRE_WIRE_H */