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lightningd/bitcoind: use the Bitcoin plugin for getutxout

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This commit is contained in:
darosior
2020-01-09 16:38:12 +01:00
committed by Rusty Russell
parent 78cb921b80
commit c79ab0f1b0
8 changed files with 137 additions and 131 deletions
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139
lightningd/bitcoind.c
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@@ -781,89 +781,88 @@ void bitcoind_getchaininfo_(struct bitcoind *bitcoind,
req);
}
struct get_output {
/* `getutxout`
*
* Get informations about an UTXO. If the TXO is spent, the plugin will set
* all fields to `null`.
* {
* "amount": <The output's amount in *sats*>,
* "script": "The output's scriptPubKey",
* }
*/
struct getutxout_call {
struct bitcoind *bitcoind;
unsigned int blocknum, txnum, outnum;
/* The real callback */
void (*cb)(struct bitcoind *bitcoind, const struct bitcoin_tx_output *txout, void *arg);
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *txout, void *arg);
/* The real callback arg */
void *cbarg;
void *cb_arg;
};
static bool process_gettxout(struct bitcoin_cli *bcli)
static void getutxout_callback(const char *buf, const jsmntok_t *toks,
const jsmntok_t *idtok,
struct getutxout_call *call)
{
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *output,
void *arg) = bcli->cb;
const jsmntok_t *tokens, *valuetok, *scriptpubkeytok, *hextok;
struct bitcoin_tx_output out;
bool valid;
const jsmntok_t *resulttok, *amounttok, *scripttok;
struct bitcoin_tx_output txout;
/* As of at least v0.15.1.0, bitcoind returns "success" but an empty
string on a spent gettxout */
if (*bcli->exitstatus != 0 || bcli->output_bytes == 0) {
cb(bcli->bitcoind, NULL, bcli->cb_arg);
return true;
resulttok = json_get_member(buf, toks, "result");
if (!resulttok)
bitcoin_plugin_error(call->bitcoind, buf, toks, "getutxout",
"bad 'result' field");
scripttok = json_get_member(buf, resulttok, "script");
if (!scripttok)
bitcoin_plugin_error(call->bitcoind, buf, toks, "getutxout",
"bad 'script' field");
if (json_tok_is_null(buf, scripttok)) {
db_begin_transaction(call->bitcoind->ld->wallet->db);
call->cb(call->bitcoind, NULL, call->cb_arg);
db_commit_transaction(call->bitcoind->ld->wallet->db);
goto clean;
}
txout.script = json_tok_bin_from_hex(tmpctx, buf, scripttok);
tokens = json_parse_input(bcli->output, bcli->output, bcli->output_bytes,
&valid);
if (!tokens)
fatal("%s: %s response",
bcli_args(tmpctx, bcli), valid ? "partial" : "invalid");
amounttok = json_get_member(buf, resulttok, "amount");
if (!amounttok)
bitcoin_plugin_error(call->bitcoind, buf, toks, "getutxout",
"bad 'amount' field");
if (!json_to_sat(buf, amounttok, &txout.amount))
bitcoin_plugin_error(call->bitcoind, buf, toks, "getutxout",
"bad sats amount");
if (tokens[0].type != JSMN_OBJECT)
fatal("%s: gave non-object (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
db_begin_transaction(call->bitcoind->ld->wallet->db);
call->cb(call->bitcoind, &txout, call->cb_arg);
db_commit_transaction(call->bitcoind->ld->wallet->db);
valuetok = json_get_member(bcli->output, tokens, "value");
if (!valuetok)
fatal("%s: had no value member (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
if (!json_to_bitcoin_amount(bcli->output, valuetok, &out.amount.satoshis)) /* Raw: talking to bitcoind */
fatal("%s: had bad value (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
scriptpubkeytok = json_get_member(bcli->output, tokens, "scriptPubKey");
if (!scriptpubkeytok)
fatal("%s: had no scriptPubKey member (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
hextok = json_get_member(bcli->output, scriptpubkeytok, "hex");
if (!hextok)
fatal("%s: had no scriptPubKey->hex member (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
out.script = tal_hexdata(bcli, bcli->output + hextok->start,
hextok->end - hextok->start);
if (!out.script)
fatal("%s: scriptPubKey->hex invalid hex (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
cb(bcli->bitcoind, &out, bcli->cb_arg);
return true;
clean:
tal_free(call);
}
void bitcoind_gettxout(struct bitcoind *bitcoind,
const struct bitcoin_txid *txid, const u32 outnum,
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *txout,
void *arg),
void *arg)
void bitcoind_getutxout_(struct bitcoind *bitcoind,
const struct bitcoin_txid *txid, const u32 outnum,
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *txout,
void *arg),
void *cb_arg)
{
start_bitcoin_cli(bitcoind, NULL,
process_gettxout, true, BITCOIND_LOW_PRIO, cb, arg,
"gettxout",
take(type_to_string(NULL, struct bitcoin_txid, txid)),
take(tal_fmt(NULL, "%u", outnum)),
NULL);
struct jsonrpc_request *req;
struct getutxout_call *call = tal(bitcoind, struct getutxout_call);
call->bitcoind = bitcoind;
call->cb = cb;
call->cb_arg = cb_arg;
req = jsonrpc_request_start(bitcoind, "getutxout", bitcoind->log,
getutxout_callback, call);
json_add_txid(req->stream, "txid", txid);
json_add_num(req->stream, "vout", outnum);
jsonrpc_request_end(req);
plugin_request_send(strmap_get(&bitcoind->pluginsmap, "getutxout"),
req);
}
/* Context for the getfilteredblock call. Wraps the actual arguments while we
@@ -901,7 +900,7 @@ process_getfilteredblock_step2(struct bitcoind *bitcoind,
call->current_outpoint++;
if (call->current_outpoint < tal_count(call->outpoints)) {
o = call->outpoints[call->current_outpoint];
bitcoind_gettxout(bitcoind, &o->txid, o->outnum,
bitcoind_getutxout(bitcoind, &o->txid, o->outnum,
process_getfilteredblock_step2, call);
} else {
/* If there were no more outpoints to check, we call the callback. */
@@ -969,7 +968,7 @@ static void process_getfilteredblock_step1(struct bitcoind *bitcoind,
* store the one's that are unspent in
* call->result->outpoints. */
o = call->outpoints[call->current_outpoint];
bitcoind_gettxout(bitcoind, &o->txid, o->outnum,
bitcoind_getutxout(bitcoind, &o->txid, o->outnum,
process_getfilteredblock_step2, call);
}
}