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如果网络处于关闭状态（例如无法访问 youtube 页面），并--preload在平台开机时使用 param 启动钴，则即使从预加载状态切换到启动状态，它也无法加载和显示 youtube ui ，url无法重载，无法显示UI，那么对于这种情况，cobalt如何处理呢？

//Even the network is on, it can not reload the YT url from SbSystemRaisePlatformError, tsa03s02-in-f142.1e100.net is the hostname of www.youtube.com
64 bytes from tsa03s02-in-f142.1e100.net (172.217.27.142): icmp_req=51 ttl=52 time=49.1 ms
64 bytes from tsa03s02-in-f142.1e100.net (172.217.27.142): icmp_req=52 ttl=52 time=48.3 ms
64 bytes from tsa03s02-in-f142.1e100.net (172.217.27.142): icmp_req=53 ttl=52 time=66.7 ms
[cobalt]>[11604:2581014753:INFO:h5vcc_url_handler.cc(119)] try to reload url, url= https://www.youtube.com/tv?additionalDataUrl=http://localhost:56789/apps/YouTube/dial_data
[cobalt]>[11604:2581014916:INFO:system_raise_platform_error.cc(49)] SbSystemRaisePlatformError: Connection error.
[cobalt]>[0810/114518:WARNING:system_window.cc(200)] Failed to notify user of error: 0
[cobalt]>[12263:2581046785:WARNING:thread_set_name.cc(36)] Thread name "SplashScreenWebModule" was truncated to "SplashScreenWeb"
64 bytes from tsa03s02-in-f14.1e100.net (172.217.27.142): icmp_req=54 ttl=52 time=48.6 ms
[cobalt]>[0810/114518:INFO:page_visibility_state.cc(70)] PageVisibilityState: app_state=kApplicationStateStarted (2)
[cobalt]>[12267:2581204654:WARNING:thread_set_name.cc(36)] Thread name "Synchronous Load" was truncated to "Synchronous Loa"
[cobalt]>[11604:2581247952:INFO:window_get_size.cc(36)] SbWindowGetSizewidth: 1920, height: 1080, ratio: 1
[cobalt]>[0810/114518:INFO:fetcher_factory.cc(94)] Fetching: h5vcc-embedded://splash_screen.html
[cobalt]>[0810/114518:INFO:fetcher_factory.cc(94)] Fetching: h5vcc-embedded://splash_screen.css
[cobalt]>[0810/114518:INFO:fetcher_factory.cc(94)] Fetching: h5vcc-embedded://you_tube_logo.png
[cobalt]>[0810/114518:INFO:fetcher_factory.cc(94)] Fetching: h5vcc-embedded://splash_screen.js
[cobalt]>[0810/114518:INFO:page_visibility_state.cc(70)] PageVisibilityState: app_state=kApplicationStateStarted (2)
[cobalt]>[12272:2581440597:WARNING:thread_set_name.cc(36)] Thread name "Synchronous Load" was truncated to "Synchronous Loa"
[cobalt]>[0810/114518:INFO:fetcher_factory.cc(94)] Fetching: https://www.youtube.com/tv?additionalDataUrl=http://loc[...]
[cobalt]>[0810/114518:ERROR:host_resolver_proc.cc(155)] [AAAAA]host= www.youtube.com
[cobalt]>[0810/114518:ERROR:browser_module.cc(702)] NetFetcher error on : net::ERR_NAME_RESOLUTION_FAILED, response code -1
[cobalt]>[0810/114518:WARNING:h5vcc_url_handler.cc(30)] url=//network-failure?retry-url=https://www.youtube.com/tv?additionalDataUrl=http://localhost:56789/apps/YouTube/dial_data
[cobalt]>[0810/114518:WARNING:h5vcc_url_handler.cc(92)] HandleNetworkFailure:
64 bytes from tsa03s02-in-f14.1e100.net (172.217.27.142): icmp_req=55 ttl=52 time=48.6 ms
64 bytes from tsa03s02-in-f142.1e100.net (172.217.27.142): icmp_req=56 ttl=52 time=49.5 ms
64 bytes from tsa03s02-in-f14.1e100.net (172.217.27.142): icmp_req=57 ttl=52 time=67.3 ms
[cobalt]>[11604:2584493042:INFO:h5vcc_url_handler.cc(119)] try to reload url, url= https://www.youtube.com/tv?additionalDataUrl=http://localhost:56789/apps/YouTube/dial_data
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2 回答 2

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在常规的非预加载模式下，如果你在没有网络的情况下启动 Cobalt，它会尝试加载 URL，失败，然后调用 SbSystemRaisePlatformError，这通常会显示某种错误对话框，然后可以回调重试指标。

在预加载模式下，情况并没有什么不同。从预加载到启动就像让应用程序可见一样，它并不表示网络状态发生了变化。

现在，如果一个实现在预加载模式下遇到平台错误，它可以等到转换开始，然后触发重试指示器。如果需要，这将取决于平台。

还有可以发送的网络状态更改事件（参见右舷/event.h），但我不确定它们是否会导致 Cobalt 自动重试。

于 2017-08-09T14:51:17.703 回答
0

将过滤器默认设置为kSbSocketResolveFilterIpv4in SystemHostResolverProcof host_resolver_proc.cc，从网络关闭状态切换到网络打开状态时不会得到ERR_NAME_RESOLUTION_FAILED，并且可以很好地重新加载 YT 页面。

于 2017-08-11T03:22:38.357 回答