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720 lines
19 KiB
720 lines
19 KiB
/* Code for talking to bitcoind. We use bitcoin-cli. */
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#include "bitcoin/base58.h"
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#include "bitcoin/block.h"
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#include "bitcoin/shadouble.h"
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#include "bitcoin/tx.h"
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#include "bitcoind.h"
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#include "lightningd.h"
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#include "log.h"
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#include <ccan/cast/cast.h>
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#include <ccan/io/io.h>
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#include <ccan/pipecmd/pipecmd.h>
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#include <ccan/str/hex/hex.h>
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#include <ccan/take/take.h>
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#include <ccan/tal/grab_file/grab_file.h>
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#include <ccan/tal/path/path.h>
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#include <ccan/tal/str/str.h>
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#include <ccan/tal/tal.h>
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#include <common/json.h>
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#include <common/memleak.h>
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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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char *bitcoin_datadir;
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static char **gather_args(const struct bitcoind *bitcoind,
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const tal_t *ctx, const char *cmd, va_list ap)
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{
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size_t n = 0;
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char **args = tal_arr(ctx, char *, 2);
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args[n++] = cast_const(char *, bitcoind->chainparams->cli);
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if (bitcoind->chainparams->cli_args) {
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args[n++] = cast_const(char *, bitcoind->chainparams->cli_args);
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tal_resize(&args, n + 1);
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}
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if (bitcoind->datadir) {
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args[n++] = tal_fmt(args, "-datadir=%s", bitcoind->datadir);
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tal_resize(&args, n + 1);
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}
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args[n++] = cast_const(char *, cmd);
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tal_resize(&args, n + 1);
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while ((args[n] = va_arg(ap, char *)) != NULL) {
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args[n] = tal_strdup(args, args[n]);
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n++;
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tal_resize(&args, n + 1);
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}
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return args;
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}
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struct bitcoin_cli {
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struct list_node list;
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struct bitcoind *bitcoind;
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int fd;
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int *exitstatus;
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pid_t pid;
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char **args;
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char *output;
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size_t output_bytes;
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size_t new_output;
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void (*process)(struct bitcoin_cli *);
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void *cb;
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void *cb_arg;
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struct bitcoin_cli **stopper;
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};
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static struct io_plan *read_more(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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bcli->output_bytes += bcli->new_output;
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if (bcli->output_bytes == tal_count(bcli->output))
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tal_resize(&bcli->output, bcli->output_bytes * 2);
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return io_read_partial(conn, bcli->output + bcli->output_bytes,
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tal_count(bcli->output) - bcli->output_bytes,
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&bcli->new_output, read_more, bcli);
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}
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static struct io_plan *output_init(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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bcli->output_bytes = bcli->new_output = 0;
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bcli->output = tal_arr(bcli, char, 100);
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return read_more(conn, bcli);
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}
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static void next_bcli(struct bitcoind *bitcoind);
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/* For printing: simple string of args. */
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static char *bcli_args(struct bitcoin_cli *bcli)
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{
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size_t i;
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char *ret = tal_strdup(bcli, bcli->args[0]);
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for (i = 1; bcli->args[i]; i++) {
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ret = tal_strcat(bcli, take(ret), " ");
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ret = tal_strcat(bcli, take(ret), bcli->args[i]);
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}
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return ret;
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}
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static void bcli_finished(struct io_conn *conn, struct bitcoin_cli *bcli)
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{
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int ret, status;
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struct bitcoind *bitcoind = bcli->bitcoind;
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/* FIXME: If we waited for SIGCHILD, this could never hang! */
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ret = waitpid(bcli->pid, &status, 0);
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if (ret != bcli->pid)
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fatal("%s %s", bcli_args(bcli),
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ret == 0 ? "not exited?" : strerror(errno));
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if (!WIFEXITED(status))
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fatal("%s died with signal %i",
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bcli_args(bcli),
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WTERMSIG(status));
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if (!bcli->exitstatus) {
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if (WEXITSTATUS(status) != 0) {
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/* Allow 60 seconds of spurious errors, eg. reorg. */
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struct timerel t;
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log_unusual(bcli->bitcoind->log,
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"%s exited with status %u",
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bcli_args(bcli),
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WEXITSTATUS(status));
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if (!bitcoind->error_count)
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bitcoind->first_error_time = time_mono();
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t = timemono_between(time_mono(),
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bitcoind->first_error_time);
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if (time_greater(t, time_from_sec(60)))
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fatal("%s exited %u (after %u other errors) '%.*s'",
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bcli_args(bcli),
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WEXITSTATUS(status),
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bitcoind->error_count,
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(int)bcli->output_bytes,
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bcli->output);
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bitcoind->error_count++;
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goto done;
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}
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} else
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*bcli->exitstatus = WEXITSTATUS(status);
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if (WEXITSTATUS(status) == 0)
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bitcoind->error_count = 0;
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bitcoind->req_running = false;
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/* Don't continue if were only here because we were freed for shutdown */
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if (bitcoind->shutdown)
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return;
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db_begin_transaction(bitcoind->ld->wallet->db);
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bcli->process(bcli);
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db_commit_transaction(bitcoind->ld->wallet->db);
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done:
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tal_free(bcli);
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next_bcli(bitcoind);
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}
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static void next_bcli(struct bitcoind *bitcoind)
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{
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struct bitcoin_cli *bcli;
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struct io_conn *conn;
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if (bitcoind->req_running)
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return;
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bcli = list_pop(&bitcoind->pending, struct bitcoin_cli, list);
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if (!bcli)
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return;
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bcli->pid = pipecmdarr(&bcli->fd, NULL, &bcli->fd, bcli->args);
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if (bcli->pid < 0)
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fatal("%s exec failed: %s", bcli->args[0], strerror(errno));
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bitcoind->req_running = true;
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/* This lifetime is attached to bitcoind command fd */
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conn = notleak(io_new_conn(bitcoind, bcli->fd, output_init, bcli));
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io_set_finish(conn, bcli_finished, bcli);
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}
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static void process_donothing(struct bitcoin_cli *bcli)
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{
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}
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/* If stopper gets freed first, set process() to a noop. */
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static void stop_process_bcli(struct bitcoin_cli **stopper)
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{
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(*stopper)->process = process_donothing;
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(*stopper)->stopper = NULL;
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}
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/* It command finishes first, free stopper. */
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static void remove_stopper(struct bitcoin_cli *bcli)
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{
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/* Calls stop_process_bcli, but we don't care. */
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tal_free(bcli->stopper);
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}
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/* If ctx is non-NULL, and is freed before we return, we don't call process() */
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static void
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start_bitcoin_cli(struct bitcoind *bitcoind,
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const tal_t *ctx,
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void (*process)(struct bitcoin_cli *),
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bool nonzero_exit_ok,
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void *cb, void *cb_arg,
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char *cmd, ...)
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{
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va_list ap;
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struct bitcoin_cli *bcli = tal(bitcoind, struct bitcoin_cli);
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bcli->bitcoind = bitcoind;
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bcli->process = process;
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bcli->cb = cb;
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bcli->cb_arg = cb_arg;
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if (ctx) {
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/* Create child whose destructor will stop us calling */
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bcli->stopper = tal(ctx, struct bitcoin_cli *);
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*bcli->stopper = bcli;
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tal_add_destructor(bcli->stopper, stop_process_bcli);
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tal_add_destructor(bcli, remove_stopper);
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} else
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bcli->stopper = NULL;
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if (nonzero_exit_ok)
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bcli->exitstatus = tal(bcli, int);
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else
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bcli->exitstatus = NULL;
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va_start(ap, cmd);
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bcli->args = gather_args(bitcoind, bcli, cmd, ap);
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va_end(ap);
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list_add_tail(&bitcoind->pending, &bcli->list);
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next_bcli(bitcoind);
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}
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static bool extract_feerate(struct bitcoin_cli *bcli,
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const char *output, size_t output_bytes,
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double *feerate)
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{
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const jsmntok_t *tokens, *feeratetok;
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bool valid;
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tokens = json_parse_input(output, output_bytes, &valid);
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if (!tokens)
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fatal("%s: %s response",
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bcli_args(bcli),
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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),
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(int)output_bytes, output);
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feeratetok = json_get_member(output, tokens, "feerate");
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if (!feeratetok)
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return false;
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return json_tok_double(output, feeratetok, feerate);
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}
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struct estimatefee {
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size_t i;
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const u32 *blocks;
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const char **estmode;
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void (*cb)(struct bitcoind *bitcoind, const u32 satoshi_per_kw[],
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void *);
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void *arg;
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u32 *satoshi_per_kw;
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};
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static void do_one_estimatefee(struct bitcoind *bitcoind,
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struct estimatefee *efee);
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static void process_estimatefee(struct bitcoin_cli *bcli)
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{
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double feerate;
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struct estimatefee *efee = bcli->cb_arg;
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/* FIXME: We could trawl recent blocks for median fee... */
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if (!extract_feerate(bcli, bcli->output, bcli->output_bytes, &feerate)) {
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log_unusual(bcli->bitcoind->log, "Unable to estimate %s/%u fee",
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efee->estmode[efee->i], efee->blocks[efee->i]);
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efee->satoshi_per_kw[efee->i] = 0;
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} else
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/* Rate in satoshi per kw. */
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efee->satoshi_per_kw[efee->i] = feerate * 100000000 / 4;
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efee->i++;
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if (efee->i == tal_count(efee->satoshi_per_kw)) {
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efee->cb(bcli->bitcoind, efee->satoshi_per_kw, efee->arg);
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tal_free(efee);
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} else {
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/* Next */
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do_one_estimatefee(bcli->bitcoind, efee);
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}
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}
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static void do_one_estimatefee(struct bitcoind *bitcoind,
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struct estimatefee *efee)
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{
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char blockstr[STR_MAX_CHARS(u32)];
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sprintf(blockstr, "%u", efee->blocks[efee->i]);
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start_bitcoin_cli(bitcoind, NULL, process_estimatefee, false, NULL, efee,
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"estimatesmartfee", blockstr, efee->estmode[efee->i],
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NULL);
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}
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void bitcoind_estimate_fees_(struct bitcoind *bitcoind,
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const u32 blocks[], const char *estmode[],
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size_t num_estimates,
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void (*cb)(struct bitcoind *bitcoind,
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const u32 satoshi_per_kw[], void *),
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void *arg)
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{
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struct estimatefee *efee = tal(bitcoind, struct estimatefee);
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efee->i = 0;
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efee->blocks = tal_dup_arr(efee, u32, blocks, num_estimates, 0);
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efee->estmode = tal_dup_arr(efee, const char *, estmode, num_estimates,
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0);
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efee->cb = cb;
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efee->arg = arg;
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efee->satoshi_per_kw = tal_arr(efee, u32, num_estimates);
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do_one_estimatefee(bitcoind, efee);
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}
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static void process_sendrawtx(struct bitcoin_cli *bcli)
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{
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void (*cb)(struct bitcoind *bitcoind,
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int, const char *msg, void *) = bcli->cb;
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const char *msg = tal_strndup(bcli, (char *)bcli->output,
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bcli->output_bytes);
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log_debug(bcli->bitcoind->log, "sendrawtx exit %u, gave %s",
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*bcli->exitstatus, msg);
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cb(bcli->bitcoind, *bcli->exitstatus, msg, bcli->cb_arg);
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}
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void bitcoind_sendrawtx_(struct bitcoind *bitcoind,
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const char *hextx,
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void (*cb)(struct bitcoind *bitcoind,
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int exitstatus, const char *msg, void *),
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void *arg)
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{
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log_debug(bitcoind->log, "sendrawtransaction: %s", hextx);
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start_bitcoin_cli(bitcoind, NULL, process_sendrawtx, true, cb, arg,
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"sendrawtransaction", hextx, NULL);
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}
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static void process_rawblock(struct bitcoin_cli *bcli)
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{
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struct bitcoin_block *blk;
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void (*cb)(struct bitcoind *bitcoind,
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struct bitcoin_block *blk,
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void *arg) = bcli->cb;
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/* FIXME: Just get header if we can't get full block. */
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blk = bitcoin_block_from_hex(bcli, bcli->output, bcli->output_bytes);
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if (!blk)
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fatal("%s: bad block '%.*s'?",
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bcli_args(bcli),
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(int)bcli->output_bytes, (char *)bcli->output);
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cb(bcli->bitcoind, blk, bcli->cb_arg);
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}
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void bitcoind_getrawblock_(struct bitcoind *bitcoind,
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const struct bitcoin_blkid *blockid,
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void (*cb)(struct bitcoind *bitcoind,
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struct bitcoin_block *blk,
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void *arg),
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void *arg)
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{
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char hex[hex_str_size(sizeof(*blockid))];
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bitcoin_blkid_to_hex(blockid, hex, sizeof(hex));
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start_bitcoin_cli(bitcoind, NULL, process_rawblock, false, cb, arg,
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"getblock", hex, "false", NULL);
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}
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static void process_getblockcount(struct bitcoin_cli *bcli)
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{
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u32 blockcount;
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char *p, *end;
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void (*cb)(struct bitcoind *bitcoind,
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u32 blockcount,
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void *arg) = bcli->cb;
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p = tal_strndup(bcli, bcli->output, bcli->output_bytes);
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blockcount = strtol(p, &end, 10);
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if (end == p || *end != '\n')
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fatal("%s: gave non-numeric blockcount %s",
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bcli_args(bcli), p);
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cb(bcli->bitcoind, blockcount, bcli->cb_arg);
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}
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void bitcoind_getblockcount_(struct bitcoind *bitcoind,
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void (*cb)(struct bitcoind *bitcoind,
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u32 blockcount,
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void *arg),
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void *arg)
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{
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start_bitcoin_cli(bitcoind, NULL, process_getblockcount, false, cb, arg,
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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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/* As of at least v0.15.1.0, bitcoind returns "success" but an empty
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string on a spent gettxout */
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if (*bcli->exitstatus != 0 || bcli->output_bytes == 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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/**
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* process_getblock -- Retrieve a block from bitcoind
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*
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* Used to resolve a `txoutput` after identifying the blockhash, and
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* before extracting the outpoint from the UTXO.
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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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void *cbarg = go->cbarg;
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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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/* Most likely we are running on a pruned node, call
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* the callback with NULL to indicate failure */
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log_debug(bcli->bitcoind->log,
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"%s: returned invalid block, is this a pruned node?",
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bcli_args(bcli));
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cb(bcli->bitcoind, NULL, cbarg);
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tal_free(go);
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return;
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}
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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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log_debug(bcli->bitcoind->log, "%s: no txnum %u",
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bcli_args(bcli), go->txnum);
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cb(bcli->bitcoind, NULL, cbarg);
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tal_free(go);
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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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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_blkid *blkid,
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void *arg) = bcli->cb;
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/* If it failed, call with NULL block. */
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if (*bcli->exitstatus != 0) {
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cb(bcli->bitcoind, NULL, bcli->cb_arg);
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return;
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}
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if (bcli->output_bytes == 0
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|| !bitcoin_blkid_from_hex(bcli->output, bcli->output_bytes-1,
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&blkid)) {
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fatal("%s: bad blockid '%.*s'",
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bcli_args(bcli), (int)bcli->output_bytes, bcli->output);
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}
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cb(bcli->bitcoind, &blkid, bcli->cb_arg);
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}
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void bitcoind_getblockhash_(struct bitcoind *bitcoind,
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u32 height,
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void (*cb)(struct bitcoind *bitcoind,
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const struct bitcoin_blkid *blkid,
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void *arg),
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void *arg)
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{
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char str[STR_MAX_CHARS(height)];
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sprintf(str, "%u", height);
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start_bitcoin_cli(bitcoind, NULL, process_getblockhash, true, cb, arg,
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"getblockhash", str, NULL);
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}
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static void destroy_bitcoind(struct bitcoind *bitcoind)
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{
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/* Suppresses the callbacks from bcli_finished as we free conns. */
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bitcoind->shutdown = true;
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}
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static char **cmdarr(const tal_t *ctx, const struct bitcoind *bitcoind,
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const char *cmd, ...)
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{
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va_list ap;
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char **args;
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va_start(ap, cmd);
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args = gather_args(bitcoind, ctx, cmd, ap);
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va_end(ap);
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return args;
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}
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void wait_for_bitcoind(struct bitcoind *bitcoind)
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{
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int from, ret, status;
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pid_t child;
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char **cmd = cmdarr(bitcoind, bitcoind, "echo", NULL);
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char *output;
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bool printed = false;
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for (;;) {
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child = pipecmdarr(&from, NULL, &from, cmd);
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if (child < 0)
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fatal("%s exec failed: %s", cmd[0], strerror(errno));
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output = grab_fd(cmd, from);
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if (!output)
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fatal("Reading from %s failed: %s",
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cmd[0], strerror(errno));
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ret = waitpid(child, &status, 0);
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if (ret != child)
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fatal("Waiting for %s: %s", cmd[0], strerror(errno));
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if (!WIFEXITED(status))
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fatal("Death of %s: signal %i",
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cmd[0], WTERMSIG(status));
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if (WEXITSTATUS(status) == 0)
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break;
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/* bitcoin/src/rpc/protocol.h:
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* RPC_IN_WARMUP = -28, //!< Client still warming up
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*/
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if (WEXITSTATUS(status) != 28)
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fatal("%s exited with code %i: %s",
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cmd[0], WEXITSTATUS(status), output);
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if (!printed) {
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log_unusual(bitcoind->log,
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"Waiting for bitcoind to warm up...");
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printed = true;
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}
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sleep(1);
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}
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tal_free(cmd);
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}
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struct bitcoind *new_bitcoind(const tal_t *ctx,
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struct lightningd *ld,
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struct log *log)
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{
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struct bitcoind *bitcoind = tal(ctx, struct bitcoind);
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/* Use testnet by default, change later if we want another network */
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bitcoind->chainparams = chainparams_for_network("testnet");
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bitcoind->datadir = NULL;
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bitcoind->ld = ld;
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bitcoind->log = log;
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bitcoind->req_running = false;
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bitcoind->shutdown = false;
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bitcoind->error_count = 0;
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list_head_init(&bitcoind->pending);
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tal_add_destructor(bitcoind, destroy_bitcoind);
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return bitcoind;
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}
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