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bcli: poll getnetworkinfo at startup

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This allows us to kill two birds with one stone: once connected, we use
the output of the successful call to do some sanity checks (only
checking the version for now, but more are yet to come!).

Changelog-Added: We now explicitly check at startup the version of our default Bitcoin backend (bitcoind).
Co-Authored-by: ZmnSCPxj <zmnscpxj@protonmail.com>
Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
This commit is contained in:
Antoine Poinsot 2020-07-30 11:38:55 +02:00 committed by Rusty Russell
parent a456d08ad0
commit 5be07c5fe3
1 changed files with 46 additions and 4 deletions
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50
plugins/bcli.c
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@ -40,6 +40,9 @@ struct bitcoind {
/* -datadir arg for bitcoin-cli. */
char *datadir;
/* bitcoind's version, used for compatibility checks. */
u32 version;
/* Is bitcoind synced? If not, we retry. */
bool synced;
@ -834,14 +837,50 @@ static void bitcoind_failure(struct plugin *p, const char *error_message)
args_string(cmd, cmd));
}
static void wait_for_bitcoind(struct plugin *p)
/* Do some sanity checks on bitcoind based on the output of `getnetworkinfo`. */
static void parse_getnetworkinfo_result(struct plugin *p, const char *buf)
{
const jsmntok_t *result, *versiontok;
bool valid;
result = json_parse_input(NULL,
buf, strlen(buf),
&valid);
if (!result || !valid)
plugin_err(p, "No or invalid response to '%s' ? Got '%s'. Can not"
" continue without proceeding to sanity checks.",
gather_args(bitcoind, "getnetworkinfo", NULL), buf);
/* Check that we have a fully-featured `estimatesmartfee`. */
versiontok = json_get_member(buf, result, "version");
if (!versiontok)
plugin_err(p, "No 'version' in '%s' ? Got '%s'. Can not"
" continue without proceeding to sanity checks.",
gather_args(bitcoind, "getnetworkinfo", NULL), buf);
if (!json_to_u32(buf, versiontok, &bitcoind->version))
plugin_err(p, "Invalid 'version' in '%s' ? Got '%s'. Can not"
" continue without proceeding to sanity checks.",
gather_args(bitcoind, "getnetworkinfo", NULL), buf);
if (bitcoind->version < 160000)
plugin_err(p, "Unsupported bitcoind version, you need to update"
" Bitcoin Core.");
tal_free(result);
}
static void wait_and_check_bitcoind(struct plugin *p)
{
int from, status, ret;
pid_t child;
const char **cmd = gather_args(bitcoind, "echo", NULL);
const char **cmd = gather_args(bitcoind, "getnetworkinfo", NULL);
bool printed = false;
char *output = NULL;
for (;;) {
tal_free(output);
child = pipecmdarr(NULL, &from, &from, cast_const2(char **,cmd));
if (child < 0) {
if (errno == ENOENT)
@ -850,7 +889,7 @@ static void wait_for_bitcoind(struct plugin *p)
plugin_err(p, "%s exec failed: %s", cmd[0], strerror(errno));
}
char *output = grab_fd(cmd, from);
output = grab_fd(cmd, from);
while ((ret = waitpid(child, &status, 0)) < 0 && errno == EINTR);
if (ret != child)
@ -881,13 +920,16 @@ static void wait_for_bitcoind(struct plugin *p)
}
sleep(1);
}
parse_getnetworkinfo_result(p, output);
tal_free(cmd);
}
static void init(struct plugin *p, const char *buffer UNUSED,
const jsmntok_t *config UNUSED)
{
wait_for_bitcoind(p);
wait_and_check_bitcoind(p);
plugin_log(p, LOG_INFORM,
"bitcoin-cli initialized and connected to bitcoind.");
}