Hi Liviu,
Your suggestion with async(sleep(), resume) is really cool. I use
async(wait_for_event(), resume) a bit differently and pause a call for
another type of event that is generated upon reception of an external
notification (SIP or clusterer) and had to patch event_routing, add a
timer and forcibly call "resume" route when it expires. But even my use
case can be rewritten by setting some global flag or cache_srote() from
an event handler and checking it from resume route.
I completely forgot that haven't sent that patch for review.
On 20.08.2020 09:37, Darpan Patel wrote:
But in my case after 40 seconds it's not trigger resume_call route, so
resume_call only called after the event will succeed ? I want to implement a
feature like if callee is not registered till 40 seconds then relay call to
PSTN Gateway .thanks alot in advance .
regards ,
Darpan Patel
Hey Darpan,
From how I recall the code, async() statements have no timeout. So
that async(wait_for_event()) will be stuck forever until that
registration arrives -- I may be wrong here, maybe Bogdan can offer
more clarifications as he delivered some work on supporting async
statement timeouts roughly 6 months ago.
Alternatively, I suggest a simpler solution, which will actually be
quite performant:
"as long as the lookup() keeps failing due the user still being
offline, keep doing
async(sleep(1 second), route_lookup_user). Start with an $avp()
value of 40 and
keep decrementing it, so you know when to give up doing those
sleep() operations,
after 40 decrements (seconds)."
Reasons why this close to optimal:
* usrloc lookup() operations are hyper-optimized, since all AoRs are
held in an AVL tree which sits in a wide hash. The lookup cost is
essentially zero.
* async(sleep()) is safe & straight-forward. It will also help you
maintain a high throughput (thousands of CPS)
* the user experience will be quite OK, with the caller receiving the
call 1 second after the registration, on the worst case
Best regards,
--
Liviu Chircu
www.twitter.com/liviuchircu |www.opensips-solutions.com
OpenSIPS Summit 2020 Distributed
www.opensips.org/events/Summit-2020Distributed
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