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core: Introduce build_managed_oom_cgroups_json()

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Will be reused to build the varlink message contents sent by user
instances of systemd to systemd-oomd's varlink server in a future
commit.
This commit is contained in:
Daan De Meyer 2021-09-02 14:32:31 +02:00
parent 71feeae4bf
commit f2ed82d510
1 changed files with 31 additions and 15 deletions
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46
src/core/core-varlink.c
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@ -123,26 +123,13 @@ int manager_varlink_send_managed_oom_update(Unit *u) {
return varlink_notify(u->manager->managed_oom_varlink_request, v);
}
static int vl_method_subscribe_managed_oom_cgroups(
Varlink *link,
JsonVariant *parameters,
VarlinkMethodFlags flags,
void *userdata) {
static int build_managed_oom_cgroups_json(Manager *m, JsonVariant **ret) {
static const UnitType supported_unit_types[] = { UNIT_SLICE, UNIT_SERVICE, UNIT_SCOPE };
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL, *arr = NULL;
Manager *m = userdata;
int r;
assert(link);
assert(m);
if (json_variant_elements(parameters) > 0)
return varlink_error_invalid_parameter(link, parameters);
/* We only take one subscriber for this method so return an error if there's already an existing one.
* This shouldn't happen since systemd-oomd is the only client of this method. */
if (FLAGS_SET(flags, VARLINK_METHOD_MORE) && m->managed_oom_varlink_request)
return varlink_error(link, VARLINK_ERROR_SUBSCRIPTION_TAKEN, NULL);
assert(ret);
r = json_build(&arr, JSON_BUILD_EMPTY_ARRAY);
if (r < 0)
@ -185,6 +172,35 @@ static int vl_method_subscribe_managed_oom_cgroups(
if (r < 0)
return r;
*ret = TAKE_PTR(v);
return 0;
}
static int vl_method_subscribe_managed_oom_cgroups(
Varlink *link,
JsonVariant *parameters,
VarlinkMethodFlags flags,
void *userdata) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
Manager *m = userdata;
int r;
assert(link);
assert(m);
if (json_variant_elements(parameters) > 0)
return varlink_error_invalid_parameter(link, parameters);
/* We only take one subscriber for this method so return an error if there's already an existing one.
* This shouldn't happen since systemd-oomd is the only client of this method. */
if (FLAGS_SET(flags, VARLINK_METHOD_MORE) && m->managed_oom_varlink_request)
return varlink_error(link, VARLINK_ERROR_SUBSCRIPTION_TAKEN, NULL);
r = build_managed_oom_cgroups_json(m, &v);
if (r < 0)
return r;
if (!FLAGS_SET(flags, VARLINK_METHOD_MORE))
return varlink_reply(link, v);