dbus: properly serialize calendar timer data

As it turns out the bus properties for timer units wre really broken,
so let's clean this up for good and properly add calendar timer
serialization. We really should get that right before finalizing the
bus API documentation in the wiki...

3 files changed, 71 insertions, 27 deletions

diff --git a/src/core/dbus-timer.c b/src/core/dbus-timer.c
index b22fcb5934..75add81519 100644
--- a/src/core/dbus-timer.c
+++ b/src/core/dbus-timer.c
@@ -30,8 +30,10 @@
 #define BUS_TIMER_INTERFACE                                             \
         " <interface name=\"org.freedesktop.systemd1.Timer\">\n"        \
         "  <property name=\"Unit\" type=\"s\" access=\"read\"/>\n"      \
-        "  <property name=\"Timers\" type=\"a(stt)\" access=\"read\"/>\n" \
-        "  <property name=\"NextElapseUSec\" type=\"t\" access=\"read\"/>\n" \
+        "  <property name=\"TimersMonotonic\" type=\"a(stt)\" access=\"read\"/>\n" \
+        "  <property name=\"TimersCalendar\" type=\"a(sst)\" access=\"read\"/>\n" \
+        "  <property name=\"NextElapseUSecRealtime\" type=\"t\" access=\"read\"/>\n" \
+        "  <property name=\"NextElapseUSecMonotonic\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"Result\" type=\"s\" access=\"read\"/>\n"    \
         " </interface>\n"
 
@@ -52,11 +54,13 @@
 const char bus_timer_interface[] _introspect_("Timer") = BUS_TIMER_INTERFACE;
 
 const char bus_timer_invalidating_properties[] =
-        "Timers\0"
-        "NextElapseUSec\0"
+        "TimersMonotonic\0"
+        "TimersRealtime\0"
+        "NextElapseUSecRealtime\0"
+        "NextElapseUSecMonotonic\0"
         "Result\0";
 
-static int bus_timer_append_timers(DBusMessageIter *i, const char *property, void *data) {
+static int bus_timer_append_monotonic_timers(DBusMessageIter *i, const char *property, void *data) {
         Timer *p = data;
         DBusMessageIter sub, sub2;
         TimerValue *k;
@@ -74,23 +78,20 @@ static int bus_timer_append_timers(DBusMessageIter *i, const char *property, voi
                 size_t l;
                 bool b;
 
-                t = timer_base_to_string(k->base);
+                if (k->base == TIMER_CALENDAR)
+                        continue;
 
-                if (endswith(t, "Sec")) {
+                t = timer_base_to_string(k->base);
+                assert(endswith(t, "Sec"));
 
-                        /* s/Sec/USec/ */
-                        l = strlen(t);
-                        buf = new(char, l+2);
-                        if (!buf)
-                                return -ENOMEM;
+                /* s/Sec/USec/ */
+                l = strlen(t);
+                buf = new(char, l+2);
+                if (!buf)
+                        return -ENOMEM;
 
-                        memcpy(buf, t, l-3);
-                        memcpy(buf+l-3, "USec", 5);
-                } else {
-                        buf = strdup(t);
-                        if (!buf)
-                                return -ENOMEM;
-                }
+                memcpy(buf, t, l-3);
+                memcpy(buf+l-3, "USec", 5);
 
                 b = dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) &&
                         dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &buf) &&
@@ -108,6 +109,48 @@ static int bus_timer_append_timers(DBusMessageIter *i, const char *property, voi
         return 0;
 }
 
+static int bus_timer_append_calendar_timers(DBusMessageIter *i, const char *property, void *data) {
+        Timer *p = data;
+        DBusMessageIter sub, sub2;
+        TimerValue *k;
+
+        assert(i);
+        assert(property);
+        assert(p);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(sst)", &sub))
+                return -ENOMEM;
+
+        LIST_FOREACH(value, k, p->values) {
+                _cleanup_free_ char *buf = NULL;
+                const char *t;
+                bool b;
+                int j;
+
+                if (k->base != TIMER_CALENDAR)
+                        continue;
+
+                t = timer_base_to_string(k->base);
+                j = calendar_spec_to_string(k->calendar_spec, &buf);
+                if (j < 0)
+                        return j;
+
+                b = dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) &&
+                        dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &t) &&
+                        dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &buf) &&
+                        dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT64, &k->next_elapse) &&
+                        dbus_message_iter_close_container(&sub, &sub2);
+
+                if (!b)
+                        return -ENOMEM;
+        }
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
 static int bus_timer_append_unit(DBusMessageIter *i, const char *property, void *data) {
         Unit *u = data;
         Timer *timer = TIMER(u);
@@ -125,11 +168,12 @@ static int bus_timer_append_unit(DBusMessageIter *i, const char *property, void
 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_timer_append_timer_result, timer_result, TimerResult);
 
 static const BusProperty bus_timer_properties[] = {
-        { "Unit",           bus_timer_append_unit,        "s", 0 },
-        { "Timers",         bus_timer_append_timers, "a(stt)", 0 },
-        { "NextElapseUSec", bus_property_append_usec,     "t", offsetof(Timer, next_elapse_monotonic) },
-        { "NextElapseUSecRealtime", bus_property_append_usec, "t", offsetof(Timer, next_elapse_realtime) },
-        { "Result",         bus_timer_append_timer_result,"s", offsetof(Timer, result)      },
+        { "Unit",                    bus_timer_append_unit,             "s",      0 },
+        { "TimersMonotonic",         bus_timer_append_monotonic_timers, "a(stt)", 0 },
+        { "TimersCalendar",          bus_timer_append_calendar_timers,  "a(sst)", 0 },
+        { "NextElapseUSecMonotonic", bus_property_append_usec,          "t",      offsetof(Timer, next_elapse_monotonic) },
+        { "NextElapseUSecRealtime",  bus_property_append_usec,          "t",      offsetof(Timer, next_elapse_realtime) },
+        { "Result",                  bus_timer_append_timer_result,     "s",      offsetof(Timer, result) },
         { NULL, }
 };
 
diff --git a/src/core/timer.c b/src/core/timer.c
index 31ef176e7e..4453aa0781 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -323,7 +323,7 @@ static void timer_enter_waiting(Timer *t, bool initial) {
                 log_debug_unit(UNIT(t)->id,
                                "%s: Monotonic timer elapses in %s the next time.",
                                UNIT(t)->id,
-                               format_timespan(buf, sizeof(buf), t->next_elapse_monotonic - ts.monotonic));
+                               format_timespan(buf, sizeof(buf), t->next_elapse_monotonic > ts.monotonic ? t->next_elapse_monotonic - ts.monotonic : 0));
 
                 r = unit_watch_timer(UNIT(t), CLOCK_MONOTONIC, false, t->next_elapse_monotonic, &t->monotonic_watch);
                 if (r < 0)
diff --git a/src/core/timer.h b/src/core/timer.h
index 57a514a68c..10d3ce1116 100644
--- a/src/core/timer.h
+++ b/src/core/timer.h
@@ -52,8 +52,8 @@ typedef struct TimerValue {
         bool disabled;
         clockid_t clock_id;
 
-        usec_t value;
-        CalendarSpec *calendar_spec;
+        usec_t value; /* only for monotonic events */
+        CalendarSpec *calendar_spec; /* only for calendar events */
         usec_t next_elapse;
 
         LIST_FIELDS(struct TimerValue, value);