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setconfig: more thorough check for internal config options.

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Now we can check that the setconfig would actually parse.  We do this
by handing NULL to the calback to indicate it's a test, which may not
work in general but works for now.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: `check` `setconfig` now checks that the new config setting would be valid.
This commit is contained in:
Rusty Russell 2024-04-04 14:06:13 +10:30
parent dcbdb85497
commit e99f061909
4 changed files with 45 additions and 12 deletions
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2
common/configvar.h
View file

@ -58,7 +58,7 @@ struct configvar {
#define OPT_SHOWMSATS (1 << (OPT_USER_START+4))
/* listconfigs should treat as a literal boolean `true` or `false` */
#define OPT_SHOWBOOL (1 << (OPT_USER_START+5))
/* Can be changed at runtime */
/* Can be changed at runtime: cb will get called with NULL for `check`! */
#define OPT_DYNAMIC (1 << (OPT_USER_START+6))
/* Use this instead of opt_register_*_arg if you want OPT_* from above */

20
lightningd/configs.c
View file

@ -586,6 +586,7 @@ static struct command_result *json_setconfig(struct command *cmd,
const struct opt_table *ot;
const char *val;
char *err;
void *arg;
if (!param_check(cmd, buffer, params,
p_req("config", param_opt_dynamic_config, &ot),
@ -598,6 +599,12 @@ static struct command_result *json_setconfig(struct command *cmd,
/* We don't handle DYNAMIC MULTI, at least yet! */
assert(!(ot->type & OPT_MULTI));
/* We use arg = NULL to tell callback it's only for testing */
if (command_check_only(cmd))
arg = NULL;
else
arg = ot->u.arg;
if (ot->type & OPT_NOARG) {
if (val)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
@ -606,10 +613,7 @@ static struct command_result *json_setconfig(struct command *cmd,
if (is_plugin_opt(ot))
return plugin_set_dynamic_opt(cmd, ot, NULL,
setconfig_success);
/* FIXME: we don't have a check-only mode! */
if (command_check_only(cmd))
return command_check_done(cmd);
err = ot->cb(ot->u.arg);
err = ot->cb(arg);
} else {
assert(ot->type & OPT_HASARG);
if (!val)
@ -619,10 +623,7 @@ static struct command_result *json_setconfig(struct command *cmd,
if (is_plugin_opt(ot))
return plugin_set_dynamic_opt(cmd, ot, val,
setconfig_success);
/* FIXME: we don't have a check-only mode! */
if (command_check_only(cmd))
return command_check_done(cmd);
err = ot->cb_arg(val, ot->u.arg);
err = ot->cb_arg(val, arg);
}
if (err) {
@ -630,6 +631,9 @@ static struct command_result *json_setconfig(struct command *cmd,
"Error setting %s: %s", ot->names + 2, err);
}
if (command_check_only(cmd))
return command_check_done(cmd);
return setconfig_success(cmd, ot, val);
}

19
lightningd/options.c
View file

@ -68,6 +68,18 @@ static char *opt_set_u64(const char *arg, u64 *u)
return tal_fmt(tmpctx, "'%s' is out of range", arg);
return NULL;
}
static char *opt_set_u64_dynamic(const char *arg, u64 *u)
{
u64 ignored;
/* In case we're called for arg checking only */
if (!u)
u = &ignored;
return opt_set_u64(arg, u);
}
static char *opt_set_u32(const char *arg, u32 *u)
{
char *endp;
@ -1533,9 +1545,10 @@ static void register_opts(struct lightningd *ld)
opt_set_msat,
opt_show_msat, &ld->config.max_dust_htlc_exposure_msat,
"Max HTLC amount that can be trimmed");
clnopt_witharg("--min-capacity-sat", OPT_SHOWINT|OPT_DYNAMIC, opt_set_u64, opt_show_u64,
&ld->config.min_capacity_sat,
"Minimum capacity in satoshis for accepting channels");
clnopt_witharg("--min-capacity-sat", OPT_SHOWINT|OPT_DYNAMIC,
opt_set_u64_dynamic, opt_show_u64,
&ld->config.min_capacity_sat,
"Minimum capacity in satoshis for accepting channels");
clnopt_witharg("--addr", OPT_MULTI, opt_add_addr, NULL,
ld,
"Set an IP address (v4 or v6) to listen on and announce to the network for incoming connections");

16
tests/test_misc.py
View file

@ -3881,6 +3881,22 @@ def test_setconfig(node_factory, bitcoind):
with pytest.raises(RpcError, match='is not a number'):
l2.rpc.setconfig(config='min-capacity-sat', val="abcd")
# Check will fail the same way.
with pytest.raises(RpcError, match='requires a value'):
l2.rpc.check('setconfig', config='min-capacity-sat')
with pytest.raises(RpcError, match='is not a number'):
l2.rpc.check('setconfig', config='min-capacity-sat', val="abcd")
# Check will pass, but NOT change value.
assert l2.rpc.check(command_to_check='setconfig', config='min-capacity-sat', val=500000) == {'command_to_check': 'setconfig'}
assert (l2.rpc.listconfigs('min-capacity-sat')['configs']
== {'min-capacity-sat':
{'source': 'default',
'value_int': 10000,
'dynamic': True}})
ret = l2.rpc.setconfig(config='min-capacity-sat', val=500000)
assert ret == {'config':
{'config': 'min-capacity-sat',