[systemd-devel] [PATCH] core: emit changes for NFailedUnits property

[Lucas De Marchi]

Ping?

-- 
Lucas De Marchi

On Wed, Feb 18, 2015 at 2:22 PM,  <lucas.de.marchi at gmail.com> wrote:
> From: Lucas De Marchi <lucas.demarchi at intel.com>
>
> By notifying the clients when this property is changed it's possible to
> allow "system health monitor" tools to get transitions like
> running<->degraded. This is an alternative to send changes on the
> SystemState property since the latter is more difficult to derive.
> ---
>  src/core/dbus-manager.c | 20 +++++++++++++++++++-
>  src/core/dbus-manager.h |  1 +
>  src/core/manager.c      | 17 +++++++++++++++++
>  src/core/manager.h      |  2 ++
>  src/core/unit.c         |  7 ++-----
>  5 files changed, 41 insertions(+), 6 deletions(-)
>
> diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
> index 8ba665d..5e83afb 100644
> --- a/src/core/dbus-manager.c
> +++ b/src/core/dbus-manager.c
> @@ -1949,7 +1949,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
>          SD_BUS_WRITABLE_PROPERTY("LogLevel", "s", property_get_log_level, property_set_log_level, 0, 0),
>          SD_BUS_WRITABLE_PROPERTY("LogTarget", "s", property_get_log_target, property_set_log_target, 0, 0),
>          SD_BUS_PROPERTY("NNames", "u", property_get_n_names, 0, 0),
> -        SD_BUS_PROPERTY("NFailedUnits", "u", property_get_n_failed_units, 0, 0),
> +        SD_BUS_PROPERTY("NFailedUnits", "u", property_get_n_failed_units, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
>          SD_BUS_PROPERTY("NJobs", "u", property_get_n_jobs, 0, 0),
>          SD_BUS_PROPERTY("NInstalledJobs", "u", bus_property_get_unsigned, offsetof(Manager, n_installed_jobs), 0),
>          SD_BUS_PROPERTY("NFailedJobs", "u", bus_property_get_unsigned, offsetof(Manager, n_failed_jobs), 0),
> @@ -2102,5 +2102,23 @@ void bus_manager_send_reloading(Manager *m, bool active) {
>          r = bus_foreach_bus(m, NULL, send_reloading, INT_TO_PTR(active));
>          if (r < 0)
>                  log_debug_errno(r, "Failed to send reloading signal: %m");
> +}
> +
> +static int send_changed_signal(sd_bus *bus, void *userdata) {
> +        assert(bus);
> +
> +        return sd_bus_emit_properties_changed_strv(bus,
> +                                                   "/org/freedesktop/systemd1",
> +                                                   "org.freedesktop.systemd1.Manager",
> +                                                   NULL);
> +}
>
> +void bus_manager_send_change_signal(Manager *m) {
> +        int r;
> +
> +        assert(m);
> +
> +        r = bus_foreach_bus(m, NULL, send_changed_signal, NULL);
> +        if (r < 0)
> +                log_debug_errno(r, "Failed to send manager change signal: %m");
>  }
> diff --git a/src/core/dbus-manager.h b/src/core/dbus-manager.h
> index e1903fa..3f7cfef 100644
> --- a/src/core/dbus-manager.h
> +++ b/src/core/dbus-manager.h
> @@ -28,3 +28,4 @@ extern const sd_bus_vtable bus_manager_vtable[];
>
>  void bus_manager_send_finished(Manager *m, usec_t firmware_usec, usec_t loader_usec, usec_t kernel_usec, usec_t initrd_usec, usec_t userspace_usec, usec_t total_usec);
>  void bus_manager_send_reloading(Manager *m, bool active);
> +void bus_manager_send_change_signal(Manager *m);
> diff --git a/src/core/manager.c b/src/core/manager.c
> index 4775219..0e9e154 100644
> --- a/src/core/manager.c
> +++ b/src/core/manager.c
> @@ -3061,6 +3061,23 @@ const char *manager_get_runtime_prefix(Manager *m) {
>                 getenv("XDG_RUNTIME_DIR");
>  }
>
> +void manager_update_failed_units(Manager *m, Unit *u, bool failed) {
> +        unsigned size;
> +
> +        assert(m);
> +        assert(u->manager == m);
> +
> +        size = set_size(m->failed_units);
> +
> +        if (failed)
> +                set_put(m->failed_units, u);
> +        else
> +                set_remove(m->failed_units, u);
> +
> +        if (set_size(m->failed_units) != size)
> +                bus_manager_send_change_signal(m);
> +}
> +
>  ManagerState manager_state(Manager *m) {
>          Unit *u;
>
> diff --git a/src/core/manager.h b/src/core/manager.h
> index d3971f1..418b752 100644
> --- a/src/core/manager.h
> +++ b/src/core/manager.h
> @@ -367,5 +367,7 @@ const char *manager_get_runtime_prefix(Manager *m);
>
>  ManagerState manager_state(Manager *m);
>
> +void manager_update_failed_units(Manager *m, Unit *u, bool failed);
> +
>  const char *manager_state_to_string(ManagerState m) _const_;
>  ManagerState manager_state_from_string(const char *s) _pure_;
> diff --git a/src/core/unit.c b/src/core/unit.c
> index ee8e607..ec45ec9 100644
> --- a/src/core/unit.c
> +++ b/src/core/unit.c
> @@ -522,7 +522,7 @@ void unit_free(Unit *u) {
>                  free(u->cgroup_path);
>          }
>
> -        set_remove(u->manager->failed_units, u);
> +        manager_update_failed_units(u->manager, u, false);
>          set_remove(u->manager->startup_units, u);
>
>          free(u->description);
> @@ -1801,10 +1801,7 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
>          }
>
>          /* Keep track of failed units */
> -        if (ns == UNIT_FAILED)
> -                set_put(u->manager->failed_units, u);
> -        else
> -                set_remove(u->manager->failed_units, u);
> +        manager_update_failed_units(u->manager, u, ns == UNIT_FAILED);
>
>          /* Make sure the cgroup is always removed when we become inactive */
>          if (UNIT_IS_INACTIVE_OR_FAILED(ns))
> --
> 2.3.0
>