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core: Introduce build_managed_oom_cgroups_json()
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.
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@ -123,26 +123,13 @@ int manager_varlink_send_managed_oom_update(Unit *u) {
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return varlink_notify(u->manager->managed_oom_varlink_request, v);
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}
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static int vl_method_subscribe_managed_oom_cgroups(
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Varlink *link,
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JsonVariant *parameters,
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VarlinkMethodFlags flags,
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void *userdata) {
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static int build_managed_oom_cgroups_json(Manager *m, JsonVariant **ret) {
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static const UnitType supported_unit_types[] = { UNIT_SLICE, UNIT_SERVICE, UNIT_SCOPE };
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_cleanup_(json_variant_unrefp) JsonVariant *v = NULL, *arr = NULL;
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Manager *m = userdata;
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int r;
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assert(link);
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assert(m);
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if (json_variant_elements(parameters) > 0)
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return varlink_error_invalid_parameter(link, parameters);
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/* We only take one subscriber for this method so return an error if there's already an existing one.
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* This shouldn't happen since systemd-oomd is the only client of this method. */
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if (FLAGS_SET(flags, VARLINK_METHOD_MORE) && m->managed_oom_varlink_request)
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return varlink_error(link, VARLINK_ERROR_SUBSCRIPTION_TAKEN, NULL);
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assert(ret);
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r = json_build(&arr, JSON_BUILD_EMPTY_ARRAY);
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if (r < 0)
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@ -185,6 +172,35 @@ static int vl_method_subscribe_managed_oom_cgroups(
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if (r < 0)
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return r;
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*ret = TAKE_PTR(v);
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return 0;
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}
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static int vl_method_subscribe_managed_oom_cgroups(
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Varlink *link,
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JsonVariant *parameters,
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VarlinkMethodFlags flags,
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void *userdata) {
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_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
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Manager *m = userdata;
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int r;
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assert(link);
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assert(m);
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if (json_variant_elements(parameters) > 0)
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return varlink_error_invalid_parameter(link, parameters);
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/* We only take one subscriber for this method so return an error if there's already an existing one.
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* This shouldn't happen since systemd-oomd is the only client of this method. */
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if (FLAGS_SET(flags, VARLINK_METHOD_MORE) && m->managed_oom_varlink_request)
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return varlink_error(link, VARLINK_ERROR_SUBSCRIPTION_TAKEN, NULL);
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r = build_managed_oom_cgroups_json(m, &v);
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if (r < 0)
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return r;
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if (!FLAGS_SET(flags, VARLINK_METHOD_MORE))
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return varlink_reply(link, v);
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