Iphone 苹果推送通知在一段时间后停止工作

修正

原来这是由我们的防火墙造成的，它会在1小时后从会话列表中删除空闲连接。我们将超时时间增加到24小时，并设置一个eventmachine定期计时器，以便每23小时重新连接一次连接。这是一个变通方法，直到eventmachine 1.0.0达到稳定，这将允许我们设置SO_KEEPALIVE，从而解决我们的问题

问题是

我们正在使用一个网络将消息推送到苹果APN。它基本上工作得很好，直到它不…：我们曾试图对其进行调试，现在将其范围缩小到苹果的套接字上发生的奇怪事件

因此，通常，在您向apns服务器发送通知之前，套接字是完全安静的。 如果您发送通知，这就是tcpdump吐出的sudo tcpdump-vv-i bond0 tcp端口2195：

到目前为止没什么可疑的。 但是，经过一段随机时间后，我们的工作进程开始每隔1-2分钟向apple服务器发送数据包，即使我们没有触发推送通知：

17:55:06.009741 IP (tos 0x0, ttl 64, id 51807, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.54853 > st11p01st-interface002-bz.push.apple.com.2195: P 0:437(437) ack 1 win 91 <nop,nop,timestamp 892959766 2935299208>
17:56:25.881823 IP (tos 0x0, ttl 64, id 51808, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.54853 > st11p01st-interface002-bz.push.apple.com.2195: P 0:437(437) ack 1 win 91 <nop,nop,timestamp 892979734 2935299208>
17:58:25.877756 IP (tos 0x0, ttl 64, id 51809, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.54853 > st11p01st-interface002-bz.push.apple.com.2195: P 0:437(437) ack 1 win 91 <nop,nop,timestamp 893009734 2935299208>
17:59:12.030887 IP (tos 0x0, ttl 64, id 20781, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.59335 > st11p01st-interface013-bz.push.apple.com.2195: P 3749093679:3749094116(437) ack 4206642630 win 91 <nop,nop,timestamp 893021272 2330366860>
17:59:12.345740 IP (tos 0x0, ttl 64, id 20782, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.59335 > st11p01st-interface013-bz.push.apple.com.2195: P 0:437(437) ack 1 win 91 <nop,nop,timestamp 893021351 2330366860>
17:59:12.977805 IP (tos 0x0, ttl 64, id 20783, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.59335 > st11p01st-interface013-bz.push.apple.com.2195: P 0:437(437) ack 1 win 91 <nop,nop,timestamp 893021509 2330366860>

一旦启动，推送通知将不再工作，直到我们重新启动工作进程。 我的想法都快用完了

更新： 在等待了一段时间而没有发送通知后，套接字上根本没有发生任何事情，我刚刚启动了另一次推送，这再次导致了所描述的行为：

19:10:44.951026 IP (tos 0x0, ttl 64, id 47829, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094502 2332623235>
19:10:45.361786 IP (tos 0x0, ttl 64, id 47830, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094605 2332623235>
19:10:46.185822 IP (tos 0x0, ttl 64, id 47831, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094811 2332623235>
19:10:47.837788 IP (tos 0x0, ttl 64, id 47832, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894095223 2332623235>
19:10:51.133744 IP (tos 0x0, ttl 64, id 47833, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894096048 2332623235>
19:10:57.725824 IP (tos 0x0, ttl 64, id 47834, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894097696 2332623235>
19:11:10.913826 IP (tos 0x0, ttl 64, id 47835, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894100992 2332623235>

19:10:44.951026 IP (tos 0x0, ttl 64, id 47829, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094502 2332623235>
19:10:45.361786 IP (tos 0x0, ttl 64, id 47830, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094605 2332623235>
19:10:46.185822 IP (tos 0x0, ttl 64, id 47831, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894094811 2332623235>
19:10:47.837788 IP (tos 0x0, ttl 64, id 47832, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894095223 2332623235>
19:10:51.133744 IP (tos 0x0, ttl 64, id 47833, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894096048 2332623235>
19:10:57.725824 IP (tos 0x0, ttl 64, id 47834, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894097696 2332623235>
19:11:10.913826 IP (tos 0x0, ttl 64, id 47835, offset 0, flags [DF], proto TCP (6), length 489) my-worker-hostname.50669 > st11p01st-interface013-bz.push.apple.com.2195: P 4331:4768(437) ack 2724 win 91 <nop,nop,timestamp 894100992 2332623235>