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Retry NTP requests more frequently if we don't receive a (valid) reply

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This commit is contained in:
Eric Frias 2014-10-07 11:10:27 -04:00
parent 0d61966a1c
commit 82dd74add0
1 changed files with 13 additions and 4 deletions
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17
src/network/ntp.cpp
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@ -23,6 +23,8 @@ namespace fc
fc::future<void> _read_loop_done;
udp_socket _sock;
uint32_t _request_interval_sec;
uint32_t _retry_failed_request_interval_sec;
fc::time_point _last_valid_ntp_reply_received_time;
std::atomic_bool _last_ntp_delta_initialized;
std::atomic<int64_t> _last_ntp_delta_microseconds;
@ -33,6 +35,7 @@ namespace fc
ntp_impl() :
_ntp_thread("ntp"),
_request_interval_sec( 60*60 /* 1 hr */),
_retry_failed_request_interval_sec(60 * 5),
_last_ntp_delta_microseconds(0)
{
_last_ntp_delta_initialized = false;
@ -98,14 +101,18 @@ namespace fc
}
} // request_now
//started for first time in ntp() constructor, canceled in ~ntp() destructor
// started for first time in ntp() constructor, canceled in ~ntp() destructor
// this task gets invoked every _retry_failed_request_interval_sec (currently 5 min), and if
// _request_interval_sec (currently 1 hour) has passed since the last successful update,
// it sends a new request
void request_time_task()
{
assert(_ntp_thread.is_current());
request_now();
if (_last_valid_ntp_reply_received_time <= fc::time_point::now() - fc::seconds(_request_interval_sec - 5))
request_now();
if (!_request_time_task_done.canceled())
_request_time_task_done = schedule( [=](){ request_time_task(); },
fc::time_point::now() + fc::seconds(_request_interval_sec),
fc::time_point::now() + fc::seconds(_retry_failed_request_interval_sec),
"request_time_task" );
} // request_loop
@ -167,6 +174,7 @@ namespace fc
_last_ntp_delta_microseconds = offset.count();
_last_ntp_delta_initialized = true;
fc::microseconds ntp_delta_time = fc::microseconds(_last_ntp_delta_microseconds);
_last_valid_ntp_reply_received_time = receive_time;
wlog("ntp_delta_time updated to ${delta_time}", ("delta_time",ntp_delta_time) );
}
else
@ -190,7 +198,7 @@ namespace fc
elog("unknown exception in read_loop, going to restart it.");
}
_sock.close();
fc::usleep(fc::seconds(_request_interval_sec));
fc::usleep(fc::seconds(_retry_failed_request_interval_sec));
} //outer while loop
wlog("exiting ntp read_loop");
} //end read_loop()
@ -247,6 +255,7 @@ namespace fc
void ntp::set_request_interval( uint32_t interval_sec )
{
my->_request_interval_sec = interval_sec;
my->_retry_failed_request_interval_sec = std::min(my->_retry_failed_request_interval_sec, interval_sec);
}
void ntp::request_now()