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vere: scry out next behn timer for backstop

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Instead of potentially waiting ten minutes in the problematic case, we
scry out the next timer from behn and set to that (if we haven't set
a new timer while we were waiting for the scry).
This commit is contained in:
Fang 2020-06-24 23:31:08 +02:00
parent 2be266de8c
commit afd1808745
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GPG Key ID: EB035760C1BBA972
1 changed files with 30 additions and 4 deletions
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34
pkg/urbit/vere/io/behn.c
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@ -19,6 +19,8 @@
c3_o alm; // alarm
} u3_behn;
static void _behn_scry_cb(void* vod_p, u3_noun nun);
/* _behn_time_cb(): timer callback.
*/
static void
@ -27,7 +29,7 @@ _behn_time_cb(uv_timer_t* tim_u)
u3_behn* teh_u = tim_u->data;
teh_u->alm = c3n;
// start another timer for 10 minutes
// take initiative to start the next timer, just in case
//
// This is a backstop to deal with the case where a %doze is not
// properly sent, for example after a crash. If the timer continues
@ -35,9 +37,10 @@ _behn_time_cb(uv_timer_t* tim_u)
// transient error, this will get us past it.
//
{
c3_d gap_d = 10 * 60 * 1000;
teh_u->alm = c3y;
uv_timer_start(&teh_u->tim_u, _behn_time_cb, gap_d, 0);
u3_noun pax = u3i_trel(u3i_string("timers"), u3i_string("next"), u3_nul);
u3_lord_peek_last(teh_u->car_u.pir_u->god_u, u3_nul,
c3_s2('b', 'x'), u3_nul, pax,
teh_u, _behn_scry_cb);
}
// send timer event
@ -82,6 +85,29 @@ _behn_ef_doze(u3_behn* teh_u, u3_noun wen)
u3z(wen);
}
/* _behn_scry_cb(): next timer scry result callback.
*/
static void
_behn_scry_cb(void* vod_p, u3_noun nun)
{
u3_behn* teh_u = vod_p;
u3_weak tim = u3r_at(7, nun);
if (c3y == teh_u->alm) {
// timer already set while we were scrying, no-op
}
else if (u3_none == tim) {
// fall back to a timer for 10 minutes
//
c3_d gap_d = 10 * 60 * 1000;
teh_u->alm = c3y;
uv_timer_start(&teh_u->tim_u, _behn_time_cb, gap_d, 0);
} else {
_behn_ef_doze(teh_u, u3k(tim));
}
u3z(nun);
}
/* _behn_io_talk(): notify %behn that we're live
*/
static void