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bitcoind: getoutput so we can check short_channel_ids.
It would be nice if bitcoind had an RPC to do this in one, but that's a bit much to ask for. We could also hand around proofs, for lite nodes. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
Christian Decker
parent
61be62ddb7
commit
2b1eb6a677
@ -20,6 +20,7 @@
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#include <common/utils.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <lightningd/chaintopology.h>
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#define BITCOIN_CLI "bitcoin-cli"
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@ -413,6 +414,172 @@ void bitcoind_getblockcount_(struct bitcoind *bitcoind,
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"getblockcount", NULL);
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}
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struct get_output {
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unsigned int blocknum, txnum, outnum;
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/* The real callback arg */
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void *cbarg;
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};
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static void process_gettxout(struct bitcoin_cli *bcli)
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{
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_tx_output *output,
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void *arg) = bcli->cb;
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const struct get_output *go = bcli->cb_arg;
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void *cbarg = go->cbarg;
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const jsmntok_t *tokens, *valuetok, *scriptpubkeytok, *hextok;
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struct bitcoin_tx_output out;
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bool valid;
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if (*bcli->exitstatus != 0) {
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log_debug(bcli->bitcoind->log, "%s: not unspent output?",
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bcli_args(bcli));
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tal_free(go);
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cb(bcli->bitcoind, NULL, cbarg);
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return;
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}
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tokens = json_parse_input(bcli->output, bcli->output_bytes, &valid);
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if (!tokens)
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fatal("%s: %s response",
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bcli_args(bcli), valid ? "partial" : "invalid");
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if (tokens[0].type != JSMN_OBJECT)
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fatal("%s: gave non-object (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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valuetok = json_get_member(bcli->output, tokens, "value");
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if (!valuetok)
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fatal("%s: had no value member (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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if (!json_tok_bitcoin_amount(bcli->output, valuetok, &out.amount))
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fatal("%s: had bad value (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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scriptpubkeytok = json_get_member(bcli->output, tokens, "scriptPubKey");
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if (!scriptpubkeytok)
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fatal("%s: had no scriptPubKey member (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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hextok = json_get_member(bcli->output, scriptpubkeytok, "hex");
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if (!hextok)
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fatal("%s: had no scriptPubKey->hex member (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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out.script = tal_hexdata(bcli, bcli->output + hextok->start,
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hextok->end - hextok->start);
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if (!out.script)
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fatal("%s: scriptPubKey->hex invalid hex (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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tal_free(go);
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cb(bcli->bitcoind, &out, cbarg);
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}
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static void process_getblock(struct bitcoin_cli *bcli)
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{
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_tx_output *output,
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void *arg) = bcli->cb;
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struct get_output *go = bcli->cb_arg;
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const jsmntok_t *tokens, *txstok, *txidtok;
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struct bitcoin_txid txid;
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bool valid;
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tokens = json_parse_input(bcli->output, bcli->output_bytes, &valid);
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if (!tokens)
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fatal("%s: %s response",
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bcli_args(bcli), valid ? "partial" : "invalid");
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if (tokens[0].type != JSMN_OBJECT)
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fatal("%s: gave non-object (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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/* "tx": [
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"1a7bb0f58a5d235d232deb61d9e2208dabe69848883677abe78e9291a00638e8",
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"56a7e3468c16a4e21a4722370b41f522ad9dd8006c0e4e73c7d1c47f80eced94",
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...
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*/
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txstok = json_get_member(bcli->output, tokens, "tx");
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if (!txstok)
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fatal("%s: had no tx member (%.*s)?",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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/* Now, this can certainly happen, if txnum too large. */
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txidtok = json_get_arr(txstok, go->txnum);
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if (!txidtok) {
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void *cbarg = go->cbarg;
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log_debug(bcli->bitcoind->log, "%s: no txnum %u",
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bcli_args(bcli), go->txnum);
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tal_free(go);
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cb(bcli->bitcoind, NULL, cbarg);
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return;
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}
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if (!bitcoin_txid_from_hex(bcli->output + txidtok->start,
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txidtok->end - txidtok->start,
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&txid))
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fatal("%s: had bad txid (%.*s)?",
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bcli_args(bcli),
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txidtok->end - txidtok->start,
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bcli->output + txidtok->start);
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/* Now get the raw tx output. */
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start_bitcoin_cli(bcli->bitcoind, NULL,
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process_gettxout, true, cb, go,
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"gettxout",
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take(type_to_string(go, struct bitcoin_txid, &txid)),
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take(tal_fmt(go, "%u", go->outnum)),
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NULL);
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}
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static void process_getblockhash_for_txout(struct bitcoin_cli *bcli)
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{
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_tx_output *output,
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void *arg) = bcli->cb;
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struct get_output *go = bcli->cb_arg;
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if (*bcli->exitstatus != 0) {
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void *cbarg = go->cbarg;
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log_debug(bcli->bitcoind->log, "%s: invalid blocknum?",
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bcli_args(bcli));
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tal_free(go);
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cb(bcli->bitcoind, NULL, cbarg);
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return;
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}
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start_bitcoin_cli(bcli->bitcoind, NULL, process_getblock, false, cb, go,
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"getblock",
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take(tal_strndup(go, bcli->output,bcli->output_bytes)),
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NULL);
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}
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void bitcoind_getoutput_(struct bitcoind *bitcoind,
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unsigned int blocknum, unsigned int txnum,
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unsigned int outnum,
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_tx_output *output,
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void *arg),
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void *arg)
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{
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struct get_output *go = tal(bitcoind, struct get_output);
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go->blocknum = blocknum;
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go->txnum = txnum;
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go->outnum = outnum;
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go->cbarg = arg;
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/* We may not have topology ourselves that far back, so ask bitcoind */
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start_bitcoin_cli(bitcoind, NULL, process_getblockhash_for_txout,
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true, cb, go,
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"getblockhash", take(tal_fmt(go, "%u", blocknum)),
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NULL);
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/* Looks like a leak, but we free it in process_getblock */
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notleak(go);
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}
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static void process_getblockhash(struct bitcoin_cli *bcli)
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{
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struct bitcoin_blkid blkid;
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@ -10,6 +10,8 @@
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#include <stdbool.h>
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struct bitcoin_blkid;
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struct bitcoin_tx_output;
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struct block;
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struct lightningd;
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struct ripemd160;
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struct bitcoin_tx;
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@ -127,4 +129,20 @@ void bitcoind_getrawblock_(struct bitcoind *bitcoind,
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struct bitcoind *, \
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struct bitcoin_block *), \
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(arg))
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void bitcoind_getoutput_(struct bitcoind *bitcoind,
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unsigned int blocknum, unsigned int txnum,
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unsigned int outnum,
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_tx_output *output,
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void *arg),
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void *arg);
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#define bitcoind_getoutput(bitcoind_, blocknum, txnum, outnum, cb, arg) \
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bitcoind_getoutput_((bitcoind_), (blocknum), (txnum), (outnum), \
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typesafe_cb_preargs(void, void *, \
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(cb), (arg), \
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struct bitcoind *, \
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const struct bitcoin_tx_output*), \
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(arg))
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#endif /* LIGHTNING_LIGHTNINGD_BITCOIND_H */
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