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bitcoind.c
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/* Code for talking to bitcoind. We use bitcoin-cli. */
#include "bitcoin/base58.h"
#include "bitcoin/block.h"
#include "bitcoin/feerate.h"
#include "bitcoin/script.h"
#include "bitcoin/shadouble.h"
#include "bitcoind.h"
#include "lightningd.h"
#include "log.h"
#include <ccan/cast/cast.h>
#include <ccan/io/io.h>
#include <ccan/pipecmd/pipecmd.h>
#include <ccan/str/hex/hex.h>
#include <ccan/take/take.h>
#include <ccan/tal/grab_file/grab_file.h>
#include <ccan/tal/path/path.h>
#include <ccan/tal/str/str.h>
#include <common/json_helpers.h>
#include <common/memleak.h>
#include <common/timeout.h>
#include <common/utils.h>
#include <errno.h>
#include <inttypes.h>
#include <lightningd/chaintopology.h>
/* Bitcoind's web server has a default of 4 threads, with queue depth 16.
* It will *fail* rather than queue beyond that, so we must not stress it!
*
* This is how many request for each priority level we have.
*/
#define BITCOIND_MAX_PARALLEL 4
/* Add the n'th arg to *args, incrementing n and keeping args of size n+1 */
static void add_arg(const char ***args, const char *arg)
{
tal_arr_expand(args, arg);
}
static const char **gather_args(const struct bitcoind *bitcoind,
const tal_t *ctx, const char *cmd, va_list ap)
{
const char **args = tal_arr(ctx, const char *, 1);
const char *arg;
args[0] = bitcoind->cli ? bitcoind->cli : chainparams->cli;
if (chainparams->cli_args)
add_arg(&args, chainparams->cli_args);
if (bitcoind->datadir)
add_arg(&args, tal_fmt(args, "-datadir=%s", bitcoind->datadir));
if (bitcoind->rpcconnect)
add_arg(&args,
tal_fmt(args, "-rpcconnect=%s", bitcoind->rpcconnect));
if (bitcoind->rpcport)
add_arg(&args,
tal_fmt(args, "-rpcport=%s", bitcoind->rpcport));
if (bitcoind->rpcuser)
add_arg(&args, tal_fmt(args, "-rpcuser=%s", bitcoind->rpcuser));
if (bitcoind->rpcpass)
add_arg(&args,
tal_fmt(args, "-rpcpassword=%s", bitcoind->rpcpass));
add_arg(&args, cmd);
while ((arg = va_arg(ap, const char *)) != NULL)
add_arg(&args, tal_strdup(args, arg));
add_arg(&args, NULL);
return args;
}
struct bitcoin_cli {
struct list_node list;
struct bitcoind *bitcoind;
int fd;
int *exitstatus;
pid_t pid;
const char **args;
struct timeabs start;
enum bitcoind_prio prio;
char *output;
size_t output_bytes;
size_t new_output;
bool (*process)(struct bitcoin_cli *);
void *cb;
void *cb_arg;
struct bitcoin_cli **stopper;
};
static struct io_plan *read_more(struct io_conn *conn, struct bitcoin_cli *bcli)
{
bcli->output_bytes += bcli->new_output;
if (bcli->output_bytes == tal_count(bcli->output))
tal_resize(&bcli->output, bcli->output_bytes * 2);
return io_read_partial(conn, bcli->output + bcli->output_bytes,
tal_count(bcli->output) - bcli->output_bytes,
&bcli->new_output, read_more, bcli);
}
static struct io_plan *output_init(struct io_conn *conn, struct bitcoin_cli *bcli)
{
bcli->output_bytes = bcli->new_output = 0;
bcli->output = tal_arr(bcli, char, 100);
return read_more(conn, bcli);
}
static void next_bcli(struct bitcoind *bitcoind, enum bitcoind_prio prio);
/* For printing: simple string of args (no secrets!) */
static char *args_string(const tal_t *ctx, const char **args)
{
size_t i;
char *ret = tal_strdup(ctx, args[0]);
for (i = 1; args[i]; i++) {
ret = tal_strcat(ctx, take(ret), " ");
if (strstarts(args[i], "-rpcpassword")) {
ret = tal_strcat(ctx, take(ret), "-rpcpassword=...");
} else if (strstarts(args[i], "-rpcuser")) {
ret = tal_strcat(ctx, take(ret), "-rpcuser=...");
} else {
ret = tal_strcat(ctx, take(ret), args[i]);
}
}
return ret;
}
static char *bcli_args(const tal_t *ctx, struct bitcoin_cli *bcli)
{
return args_string(ctx, bcli->args);
}
static void retry_bcli(struct bitcoin_cli *bcli)
{
list_add_tail(&bcli->bitcoind->pending[bcli->prio], &bcli->list);
next_bcli(bcli->bitcoind, bcli->prio);
}
/* We allow 60 seconds of spurious errors, eg. reorg. */
static void bcli_failure(struct bitcoind *bitcoind,
struct bitcoin_cli *bcli,
int exitstatus)
{
struct timerel t;
if (!bitcoind->error_count)
bitcoind->first_error_time = time_mono();
t = timemono_between(time_mono(), bitcoind->first_error_time);
if (time_greater(t, time_from_sec(bitcoind->retry_timeout)))
fatal("%s exited %u (after %u other errors) '%.*s'; "
"we have been retrying command for "
"--bitcoin-retry-timeout=%"PRIu64" seconds; "
"bitcoind setup or our --bitcoin-* configs broken?",
bcli_args(tmpctx, bcli),
exitstatus,
bitcoind->error_count,
(int)bcli->output_bytes,
bcli->output,
bitcoind->retry_timeout);
log_unusual(bitcoind->log,
"%s exited with status %u",
bcli_args(tmpctx, bcli), exitstatus);
bitcoind->error_count++;
/* Retry in 1 second (not a leak!) */
new_reltimer(bitcoind->ld->timers, notleak(bcli), time_from_sec(1),
retry_bcli, bcli);
}
static void bcli_finished(struct io_conn *conn UNUSED, struct bitcoin_cli *bcli)
{
int ret, status;
struct bitcoind *bitcoind = bcli->bitcoind;
enum bitcoind_prio prio = bcli->prio;
bool ok;
u64 msec = time_to_msec(time_between(time_now(), bcli->start));
/* If it took over 10 seconds, that's rather strange. */
if (msec > 10000)
log_unusual(bitcoind->log,
"bitcoin-cli: finished %s (%"PRIu64" ms)",
bcli_args(tmpctx, bcli), msec);
assert(bitcoind->num_requests[prio] > 0);
/* FIXME: If we waited for SIGCHILD, this could never hang! */
while ((ret = waitpid(bcli->pid, &status, 0)) < 0 && errno == EINTR);
if (ret != bcli->pid)
fatal("%s %s", bcli_args(tmpctx, bcli),
ret == 0 ? "not exited?" : strerror(errno));
if (!WIFEXITED(status))
fatal("%s died with signal %i",
bcli_args(tmpctx, bcli),
WTERMSIG(status));
if (!bcli->exitstatus) {
if (WEXITSTATUS(status) != 0) {
bcli_failure(bitcoind, bcli, WEXITSTATUS(status));
bitcoind->num_requests[prio]--;
goto done;
}
} else
*bcli->exitstatus = WEXITSTATUS(status);
if (WEXITSTATUS(status) == 0)
bitcoind->error_count = 0;
bitcoind->num_requests[bcli->prio]--;
/* Don't continue if were only here because we were freed for shutdown */
if (bitcoind->shutdown)
return;
db_begin_transaction(bitcoind->ld->wallet->db);
ok = bcli->process(bcli);
db_commit_transaction(bitcoind->ld->wallet->db);
if (!ok)
bcli_failure(bitcoind, bcli, WEXITSTATUS(status));
else
tal_free(bcli);
done:
next_bcli(bitcoind, prio);
}
static void next_bcli(struct bitcoind *bitcoind, enum bitcoind_prio prio)
{
struct bitcoin_cli *bcli;
struct io_conn *conn;
if (bitcoind->num_requests[prio] >= BITCOIND_MAX_PARALLEL)
return;
bcli = list_pop(&bitcoind->pending[prio], struct bitcoin_cli, list);
if (!bcli)
return;
bcli->pid = pipecmdarr(NULL, &bcli->fd, &bcli->fd,
cast_const2(char **, bcli->args));
if (bcli->pid < 0)
fatal("%s exec failed: %s", bcli->args[0], strerror(errno));
bcli->start = time_now();
bitcoind->num_requests[prio]++;
/* This lifetime is attached to bitcoind command fd */
conn = notleak(io_new_conn(bitcoind, bcli->fd, output_init, bcli));
io_set_finish(conn, bcli_finished, bcli);
}
static bool process_donothing(struct bitcoin_cli *bcli UNUSED)
{
return true;
}
/* If stopper gets freed first, set process() to a noop. */
static void stop_process_bcli(struct bitcoin_cli **stopper)
{
(*stopper)->process = process_donothing;
(*stopper)->stopper = NULL;
}
/* It command finishes first, free stopper. */
static void remove_stopper(struct bitcoin_cli *bcli)
{
/* Calls stop_process_bcli, but we don't care. */
tal_free(bcli->stopper);
}
/* If ctx is non-NULL, and is freed before we return, we don't call process().
* process returns false() if it's a spurious error, and we should retry. */
static void
start_bitcoin_cli(struct bitcoind *bitcoind,
const tal_t *ctx,
bool (*process)(struct bitcoin_cli *),
bool nonzero_exit_ok,
enum bitcoind_prio prio,
void *cb, void *cb_arg,
char *cmd, ...)
{
va_list ap;
struct bitcoin_cli *bcli = tal(bitcoind, struct bitcoin_cli);
bcli->bitcoind = bitcoind;
bcli->process = process;
bcli->prio = prio;
bcli->cb = cb;
bcli->cb_arg = cb_arg;
if (ctx) {
/* Create child whose destructor will stop us calling */
bcli->stopper = tal(ctx, struct bitcoin_cli *);
*bcli->stopper = bcli;
tal_add_destructor(bcli->stopper, stop_process_bcli);
tal_add_destructor(bcli, remove_stopper);
} else
bcli->stopper = NULL;
if (nonzero_exit_ok)
bcli->exitstatus = tal(bcli, int);
else
bcli->exitstatus = NULL;
va_start(ap, cmd);
bcli->args = gather_args(bitcoind, bcli, cmd, ap);
va_end(ap);
list_add_tail(&bitcoind->pending[bcli->prio], &bcli->list);
next_bcli(bitcoind, bcli->prio);
}
static bool extract_feerate(struct bitcoin_cli *bcli,
const char *output, size_t output_bytes,
u64 *feerate)
{
const jsmntok_t *tokens, *feeratetok;
bool valid;
tokens = json_parse_input(output, output, output_bytes, &valid);
if (!tokens)
fatal("%s: %s response",
bcli_args(tmpctx, bcli),
valid ? "partial" : "invalid");
if (tokens[0].type != JSMN_OBJECT) {
log_unusual(bcli->bitcoind->log,
"%s: gave non-object (%.*s)?",
bcli_args(tmpctx, bcli),
(int)output_bytes, output);
return false;
}
feeratetok = json_get_member(output, tokens, "feerate");
if (!feeratetok)
return false;
return json_to_bitcoin_amount(output, feeratetok, feerate);
}
struct estimatefee {
size_t i;
const u32 *blocks;
const char **estmode;
void (*cb)(struct bitcoind *bitcoind, const u32 satoshi_per_kw[],
void *);
void *arg;
u32 *satoshi_per_kw;
};
static void do_one_estimatefee(struct bitcoind *bitcoind,
struct estimatefee *efee);
static bool process_estimatefee(struct bitcoin_cli *bcli)
{
u64 feerate;
struct estimatefee *efee = bcli->cb_arg;
/* FIXME: We could trawl recent blocks for median fee... */
if (!extract_feerate(bcli, bcli->output, bcli->output_bytes, &feerate)) {
log_unusual(bcli->bitcoind->log, "Unable to estimate %s/%u fee",
efee->estmode[efee->i], efee->blocks[efee->i]);
#if DEVELOPER
/* This is needed to test for failed feerate estimates
* in DEVELOPER mode */
efee->satoshi_per_kw[efee->i] = 0;
#else
/* If we are in testnet mode we want to allow payments
* with the minimal fee even if the estimate didn't
* work out. This is less disruptive than erring out
* all the time. */
if (chainparams->testnet)
efee->satoshi_per_kw[efee->i] = FEERATE_FLOOR;
else
efee->satoshi_per_kw[efee->i] = 0;
#endif
} else
/* Rate in satoshi per kw. */
efee->satoshi_per_kw[efee->i]
= feerate_from_style(feerate, FEERATE_PER_KBYTE);
efee->i++;
if (efee->i == tal_count(efee->satoshi_per_kw)) {
efee->cb(bcli->bitcoind, efee->satoshi_per_kw, efee->arg);
tal_free(efee);
} else {
/* Next */
do_one_estimatefee(bcli->bitcoind, efee);
}
return true;
}
static void do_one_estimatefee(struct bitcoind *bitcoind,
struct estimatefee *efee)
{
char blockstr[STR_MAX_CHARS(u32)];
snprintf(blockstr, sizeof(blockstr), "%u", efee->blocks[efee->i]);
start_bitcoin_cli(bitcoind, NULL, process_estimatefee, false,
BITCOIND_LOW_PRIO,
NULL, efee,
"estimatesmartfee", blockstr, efee->estmode[efee->i],
NULL);
}
void bitcoind_estimate_fees_(struct bitcoind *bitcoind,
const u32 blocks[], const char *estmode[],
size_t num_estimates,
void (*cb)(struct bitcoind *bitcoind,
const u32 satoshi_per_kw[], void *),
void *arg)
{
struct estimatefee *efee = tal(bitcoind, struct estimatefee);
efee->i = 0;
efee->blocks = tal_dup_arr(efee, u32, blocks, num_estimates, 0);
efee->estmode = tal_dup_arr(efee, const char *, estmode, num_estimates,
0);
efee->cb = cb;
efee->arg = arg;
efee->satoshi_per_kw = tal_arr(efee, u32, num_estimates);
do_one_estimatefee(bitcoind, efee);
}
static bool process_sendrawtx(struct bitcoin_cli *bcli)
{
void (*cb)(struct bitcoind *bitcoind,
int, const char *msg, void *) = bcli->cb;
const char *msg = tal_strndup(bcli, bcli->output,
bcli->output_bytes);
log_debug(bcli->bitcoind->log, "sendrawtx exit %u, gave %s",
*bcli->exitstatus, msg);
cb(bcli->bitcoind, *bcli->exitstatus, msg, bcli->cb_arg);
return true;
}
void bitcoind_sendrawtx_(struct bitcoind *bitcoind,
const char *hextx,
void (*cb)(struct bitcoind *bitcoind,
int exitstatus, const char *msg, void *),
void *arg)
{
log_debug(bitcoind->log, "sendrawtransaction: %s", hextx);
start_bitcoin_cli(bitcoind, NULL, process_sendrawtx, true,
BITCOIND_HIGH_PRIO,
cb, arg,
"sendrawtransaction", hextx, NULL);
}
static bool process_rawblock(struct bitcoin_cli *bcli)
{
struct bitcoin_block *blk;
void (*cb)(struct bitcoind *bitcoind,
struct bitcoin_block *blk,
void *arg) = bcli->cb;
blk = bitcoin_block_from_hex(bcli, chainparams,
bcli->output, bcli->output_bytes);
if (!blk)
fatal("%s: bad block '%.*s'?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
cb(bcli->bitcoind, blk, bcli->cb_arg);
return true;
}
void bitcoind_getrawblock_(struct bitcoind *bitcoind,
const struct bitcoin_blkid *blockid,
void (*cb)(struct bitcoind *bitcoind,
struct bitcoin_block *blk,
void *arg),
void *arg)
{
char hex[hex_str_size(sizeof(*blockid))];
bitcoin_blkid_to_hex(blockid, hex, sizeof(hex));
start_bitcoin_cli(bitcoind, NULL, process_rawblock, false,
BITCOIND_HIGH_PRIO,
cb, arg,
"getblock", hex, "false", NULL);
}
static bool process_getblockcount(struct bitcoin_cli *bcli)
{
u32 blockcount;
char *p, *end;
void (*cb)(struct bitcoind *bitcoind,
u32 blockcount,
void *arg) = bcli->cb;
p = tal_strndup(bcli, bcli->output, bcli->output_bytes);
blockcount = strtol(p, &end, 10);
if (end == p || *end != '\n')
fatal("%s: gave non-numeric blockcount %s",
bcli_args(tmpctx, bcli), p);
cb(bcli->bitcoind, blockcount, bcli->cb_arg);
return true;
}
void bitcoind_getblockcount_(struct bitcoind *bitcoind,
void (*cb)(struct bitcoind *bitcoind,
u32 blockcount,
void *arg),
void *arg)
{
start_bitcoin_cli(bitcoind, NULL, process_getblockcount, false,
BITCOIND_HIGH_PRIO,
cb, arg,
"getblockcount", NULL);
}
struct get_output {
unsigned int blocknum, txnum, outnum;
/* The real callback */
void (*cb)(struct bitcoind *bitcoind, const struct bitcoin_tx_output *txout, void *arg);
/* The real callback arg */
void *cbarg;
};
static void process_get_output(struct bitcoind *bitcoind, const struct bitcoin_tx_output *txout, void *arg)
{
struct get_output *go = arg;
go->cb(bitcoind, txout, go->cbarg);
}
static bool process_gettxout(struct bitcoin_cli *bcli)
{
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;
/* 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;
}
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");
if (tokens[0].type != JSMN_OBJECT)
fatal("%s: gave non-object (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
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;
}
/**
* process_getblock -- Retrieve a block from bitcoind
*
* Used to resolve a `txoutput` after identifying the blockhash, and
* before extracting the outpoint from the UTXO.
*/
static bool process_getblock(struct bitcoin_cli *bcli)
{
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *output,
void *arg) = bcli->cb;
struct get_output *go = bcli->cb_arg;
void *cbarg = go->cbarg;
const jsmntok_t *tokens, *txstok, *txidtok;
struct bitcoin_txid txid;
bool valid;
tokens = json_parse_input(bcli->output, bcli->output, bcli->output_bytes,
&valid);
if (!tokens) {
/* Most likely we are running on a pruned node, call
* the callback with NULL to indicate failure */
log_debug(bcli->bitcoind->log,
"%s: returned invalid block, is this a pruned node?",
bcli_args(tmpctx, bcli));
cb(bcli->bitcoind, NULL, cbarg);
tal_free(go);
return true;
}
if (tokens[0].type != JSMN_OBJECT)
fatal("%s: gave non-object (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
/* "tx": [
"1a7bb0f58a5d235d232deb61d9e2208dabe69848883677abe78e9291a00638e8",
"56a7e3468c16a4e21a4722370b41f522ad9dd8006c0e4e73c7d1c47f80eced94",
...
*/
txstok = json_get_member(bcli->output, tokens, "tx");
if (!txstok)
fatal("%s: had no tx member (%.*s)?",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
/* Now, this can certainly happen, if txnum too large. */
txidtok = json_get_arr(txstok, go->txnum);
if (!txidtok) {
log_debug(bcli->bitcoind->log, "%s: no txnum %u",
bcli_args(tmpctx, bcli), go->txnum);
cb(bcli->bitcoind, NULL, cbarg);
tal_free(go);
return true;
}
if (!bitcoin_txid_from_hex(bcli->output + txidtok->start,
txidtok->end - txidtok->start,
&txid))
fatal("%s: had bad txid (%.*s)?",
bcli_args(tmpctx, bcli),
json_tok_full_len(txidtok),
json_tok_full(bcli->output, txidtok));
go->cb = cb;
/* Now get the raw tx output. */
bitcoind_gettxout(bcli->bitcoind, &txid, go->outnum, process_get_output, go);
return true;
}
static bool process_getblockhash_for_txout(struct bitcoin_cli *bcli)
{
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *output,
void *arg) = bcli->cb;
struct get_output *go = bcli->cb_arg;
char *blockhash;
if (*bcli->exitstatus != 0) {
void *cbarg = go->cbarg;
log_debug(bcli->bitcoind->log, "%s: invalid blocknum?",
bcli_args(tmpctx, bcli));
tal_free(go);
cb(bcli->bitcoind, NULL, cbarg);
return true;
}
/* Strip the newline at the end of the previous output */
blockhash = tal_strndup(NULL, bcli->output, bcli->output_bytes-1);
start_bitcoin_cli(bcli->bitcoind, NULL, process_getblock, true,
BITCOIND_LOW_PRIO,
cb, go,
"getblock", take(blockhash), NULL);
return true;
}
void bitcoind_getoutput_(struct bitcoind *bitcoind,
unsigned int blocknum, unsigned int txnum,
unsigned int outnum,
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *output,
void *arg),
void *arg)
{
struct get_output *go = tal(bitcoind, struct get_output);
go->blocknum = blocknum;
go->txnum = txnum;
go->outnum = outnum;
go->cbarg = arg;
/* We may not have topology ourselves that far back, so ask bitcoind */
start_bitcoin_cli(bitcoind, NULL, process_getblockhash_for_txout,
true, BITCOIND_LOW_PRIO, cb, go,
"getblockhash", take(tal_fmt(NULL, "%u", blocknum)),
NULL);
/* Looks like a leak, but we free it in process_getblock */
notleak(go);
}
static bool process_getblockhash(struct bitcoin_cli *bcli)
{
struct bitcoin_blkid blkid;
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_blkid *blkid,
void *arg) = bcli->cb;
/* If it failed with error 8, call with NULL block. */
if (*bcli->exitstatus != 0) {
/* Other error means we have to retry. */
if (*bcli->exitstatus != 8)
return false;
cb(bcli->bitcoind, NULL, bcli->cb_arg);
return true;
}
if (bcli->output_bytes == 0
|| !bitcoin_blkid_from_hex(bcli->output, bcli->output_bytes-1,
&blkid)) {
fatal("%s: bad blockid '%.*s'",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes, bcli->output);
}
cb(bcli->bitcoind, &blkid, bcli->cb_arg);
return true;
}
void bitcoind_getblockhash_(struct bitcoind *bitcoind,
u32 height,
void (*cb)(struct bitcoind *bitcoind,
const struct bitcoin_blkid *blkid,
void *arg),
void *arg)
{
char str[STR_MAX_CHARS(height)];
snprintf(str, sizeof(str), "%u", height);
start_bitcoin_cli(bitcoind, NULL, process_getblockhash, true,
BITCOIND_HIGH_PRIO,
cb, arg,
"getblockhash", str, NULL);
}
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)
{
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);
}
/* Context for the getfilteredblock call. Wraps the actual arguments while we
* process the various steps. */
struct filteredblock_call {
struct list_node list;
void (*cb)(struct bitcoind *bitcoind, const struct filteredblock *fb,
void *arg);
void *arg;
struct filteredblock *result;
struct filteredblock_outpoint **outpoints;
size_t current_outpoint;
struct timeabs start_time;
u32 height;
};
/* Declaration for recursion in process_getfilteredblock_step1 */
static void
process_getfiltered_block_final(struct bitcoind *bitcoind,
const struct filteredblock_call *call);
static void
process_getfilteredblock_step3(struct bitcoind *bitcoind,
const struct bitcoin_tx_output *output,
void *arg)
{
struct filteredblock_call *call = (struct filteredblock_call *)arg;
struct filteredblock_outpoint *o = call->outpoints[call->current_outpoint];
/* If this output is unspent, add it to the filteredblock result. */
if (output)
tal_arr_expand(&call->result->outpoints, tal_steal(call->result, o));
call->current_outpoint++;
if (call->current_outpoint < tal_count(call->outpoints)) {
o = call->outpoints[call->current_outpoint];
bitcoind_gettxout(bitcoind, &o->txid, o->outnum,
process_getfilteredblock_step3, call);
} else {
/* If there were no more outpoints to check, we call the callback. */
process_getfiltered_block_final(bitcoind, call);
}
}
static void process_getfilteredblock_step2(struct bitcoind *bitcoind,
struct bitcoin_block *block,
struct filteredblock_call *call)
{
struct filteredblock_outpoint *o;
struct bitcoin_tx *tx;
/* If for some reason we couldn't get the block, just report a
* failure. */
if (block == NULL)
return process_getfiltered_block_final(bitcoind, call);
call->result->prev_hash = block->hdr.prev_hash;
/* Allocate an array containing all the potentially interesting
* outpoints. We will later copy the ones we're interested in into the
* call->result if they are unspent. */
call->outpoints = tal_arr(call, struct filteredblock_outpoint *, 0);
for (size_t i = 0; i < tal_count(block->tx); i++) {
tx = block->tx[i];
for (size_t j = 0; j < tx->wtx->num_outputs; j++) {
const u8 *script = bitcoin_tx_output_get_script(NULL, tx, j);
struct amount_asset amount = bitcoin_tx_output_get_amount(tx, j);
if (amount_asset_is_main(&amount) && is_p2wsh(script, NULL)) {
/* This is an interesting output, remember it. */
o = tal(call->outpoints, struct filteredblock_outpoint);
bitcoin_txid(tx, &o->txid);
o->amount = amount_asset_to_sat(&amount);
o->txindex = i;
o->outnum = j;
o->scriptPubKey = tal_steal(o, script);
tal_arr_expand(&call->outpoints, o);
} else {
tal_free(script);
}
}
}
if (tal_count(call->outpoints) == 0) {
/* If there were no outpoints to check, we can short-circuit
* and just call the callback. */
process_getfiltered_block_final(bitcoind, call);
} else {
/* Otherwise we start iterating through call->outpoints and
* store the one's that are unspent in
* call->result->outpoints. */
o = call->outpoints[call->current_outpoint];
bitcoind_gettxout(bitcoind, &o->txid, o->outnum,
process_getfilteredblock_step3, call);
}
}
static void process_getfilteredblock_step1(struct bitcoind *bitcoind,
const struct bitcoin_blkid *blkid,
struct filteredblock_call *call)
{
/* If we were unable to fetch the block hash (bitcoind doesn't know
* about a block at that height), we can short-circuit and just call
* the callback. */
if (!blkid)
return process_getfiltered_block_final(bitcoind, call);
/* So we have the first piece of the puzzle, the block hash */
call->result = tal(call, struct filteredblock);
call->result->height = call->height;
call->result->outpoints = tal_arr(call->result, struct filteredblock_outpoint *, 0);
call->result->id = *blkid;
/* Now get the raw block to get all outpoints that were created in
* this block. */
bitcoind_getrawblock(bitcoind, blkid, process_getfilteredblock_step2, call);
}
/* Takes a call, dispatches it to all queued requests that match the same
* height, and then kicks off the next call. */
static void
process_getfiltered_block_final(struct bitcoind *bitcoind,
const struct filteredblock_call *call)
{
struct filteredblock_call *c, *next;
u32 height = call->height;
if (call->result == NULL)
goto next;
/* Need to steal so we don't accidentally free it while iterating through the list below. */
struct filteredblock *fb = tal_steal(NULL, call->result);
list_for_each_safe(&bitcoind->pending_getfilteredblock, c, next, list) {
if (c->height == height) {
c->cb(bitcoind, fb, c->arg);
list_del(&c->list);
tal_free(c);
}
}
tal_free(fb);
next:
/* Nothing to free here, since `*call` was already deleted during the
* iteration above. It was also removed from the list, so no need to
* pop here. */
if (!list_empty(&bitcoind->pending_getfilteredblock)) {
c = list_top(&bitcoind->pending_getfilteredblock, struct filteredblock_call, list);
bitcoind_getblockhash(bitcoind, c->height, process_getfilteredblock_step1, c);
}
}
void bitcoind_getfilteredblock_(struct bitcoind *bitcoind, u32 height,
void (*cb)(struct bitcoind *bitcoind,
const struct filteredblock *fb,
void *arg),
void *arg)
{
/* Stash the call context for when we need to call the callback after
* all the bitcoind calls we need to perform. */
struct filteredblock_call *call = tal(bitcoind, struct filteredblock_call);
/* If this is the first request, we should start processing it. */
bool start = list_empty(&bitcoind->pending_getfilteredblock);
call->cb = cb;
call->arg = arg;
call->height = height;
assert(call->cb != NULL);
call->start_time = time_now();
call->result = NULL;
call->current_outpoint = 0;
list_add_tail(&bitcoind->pending_getfilteredblock, &call->list);
if (start)
bitcoind_getblockhash(bitcoind, height, process_getfilteredblock_step1, call);
}
static bool extract_numeric_version(struct bitcoin_cli *bcli,
const char *output, size_t output_bytes,
u64 *version)
{
const jsmntok_t *tokens, *versiontok;
bool valid;
tokens = json_parse_input(output, output, output_bytes, &valid);
if (!tokens)
fatal("%s: %s response",
bcli_args(tmpctx, bcli),
valid ? "partial" : "invalid");
if (tokens[0].type != JSMN_OBJECT) {
log_unusual(bcli->bitcoind->log,
"%s: gave non-object (%.*s)?",
bcli_args(tmpctx, bcli),
(int)output_bytes, output);
return false;
}
versiontok = json_get_member(output, tokens, "version");
if (!versiontok)
return false;
return json_to_u64(output, versiontok, version);
}
static bool process_getclientversion(struct bitcoin_cli *bcli)
{
u64 version;
u64 min_version = chainparams->cli_min_supported_version;
if (!extract_numeric_version(bcli, bcli->output,
bcli->output_bytes,
&version)) {
fatal("%s: Unable to getclientversion (%.*s)",
bcli_args(tmpctx, bcli),
(int)bcli->output_bytes,
bcli->output);
}
if (version < min_version)