javascript - 传输大数据时 CEFPython 窗口关闭且无警告

Question

我正在尝试创建这个Python绑定(bind)到我创建的Electronjs应用程序，其中Python部分用于分析数据，并将结果(Python字典)传递到Web浏览器进行可视化。对于少量数据来说，这一切就像一个魅力，但是当我尝试传递一个大结果字典(~200MB)时，窗口被创建，但在终端中没有警告就关闭了(我无法检查 devtool)，尽管有似乎是一个在后端运行的子进程。这个问题在 Windows 和 Ubuntu 机器上都发生过，非常感谢您的帮助。

这是我的代码:

def view(data):

config = data

settings = {
    "debug": True,
    "log_severity": cef.LOGSEVERITY_INFO,
    "log_file": "debug.log",
}
cef.Initialize(settings=settings)
browser_setting = { "file_access_from_file_urls_allowed":True,\
                "universal_access_from_file_urls_allowed": True,\
                "web_security_disabled":True}
browser = cef.CreateBrowserSync(url='file://' + os.path.realpath("index_cefpython.html"),
                                window_title="Javascript Bindings", settings = browser_setting)
browser.SetClientHandler(LoadHandler(config))
bindings = cef.JavascriptBindings()
browser.SetJavascriptBindings(bindings)
cef.MessageLoop()
del browser
cef.Shutdown()

return 


class LoadHandler(object):

def __init__(self, config):
    self.config = config
def OnLoadEnd(self, browser, **_):
    browser.ExecuteFunction("defineData", self.config)

在 JS 方面，我有:

<script type="text/javascript">
    function defineData(datainput){             

    console.log("start")
    data = datainput;

    Main();
    }
</script>

这是终端中打印出来的所有消息:

[0312/104311.439:INFO:cefpython_app.cpp(199)] [Browser process] OnBeforeChildProcessLaunch() command line: "<>\Anaconda3\lib\site-packages\cefpython3\subprocess" --type=gpu-process --no-sandbox --locales-dir-path="<>\Anaconda3\lib\site-packages\cefpython3\locales" --log-file=debug.log --log-severity=info --resources-dir-path="<>\Anaconda3\lib\site-packages\cefpython3" --lang=en-US --disable-gpu-shader-disk-cache /prefetch:2

[0312/104311.440:INFO:cef_log.cpp(8)] [Browser process] Switch already set, ignoring: disable-gpu-shader-disk-cache

[0312/104311.440:INFO:cefpython_app.cpp(199)] [Browser process] OnBeforeChildProcessLaunch() command line: "<>\Anaconda3\lib\site-packages\cefpython3\subprocess" --type=gpu-process --no-sandbox --locales-dir-path="C:\Users\Xiangyun\Anaconda3\lib\site-packages\cefpython3\locales" --log-file=debug.log --log-severity=info --resources-dir-path=" <>\Anaconda3\lib\site-packages\cefpython3" --lang=en-US --disable-gpu-shader-disk-cache --gpu-preferences=KAAAAAAAAACAA4CAAQAAAAAAAAAAAGAAEAAAAAAAAAAAAAAAAAAAACgAAAAEAAAAIAAAAAAAAAAoAAAAAAAAADAAAAAAAAAAOAAAAAAAAAAQAAAAAAAAAAAAAAAKAAAAEAAAAAAAAAAAAAAACwAAABAAAAAAAAAAAQAAAAoAAAAQAAAAAAAAAAEAAAALAAAA --locales-dir-path="<>\Anaconda3\lib\site-packages\cefpython3\locales" --log-file=debug.log --log-severity=info --resources-dir-path="<>\Anaconda3\lib\site-packages\cefpython3" --lang=en-US /prefetch:2

[0312/104311.473:INFO:cef_log.cpp(8)] [Browser process] CreateBrowserSync() called

DevTools listening on ws://127.0.0.1:59232/devtools/browser/abaff316-3b5c-4647-8af3-c7c521146d08 [0312/104311.473:INFO:cef_log.cpp(8)] [Browser process] navigateUrl: file://///<>/index_cefpython.html

[0312/104311.475:INFO:cef_log.cpp(8)] [Browser process] CefBrowser::CreateBrowserSync()

[0312/104311.493:INFO:cef_log.cpp(8)] [Browser process] GetPyBrowser(): create new PyBrowser, browserId=1

[0312/104311.516:INFO:cefpython_app.cpp(199)] [Browser process] OnBeforeChildProcessLaunch() command line: "<>\Anaconda3\lib\site-packages\cefpython3\subprocess" --type=renderer --no-sandbox --service-pipe-token=C31AF08C64F1883299C21D068EF5263C --lang=en-US --locales-dir-path=<>\Anaconda3\lib\site-packages\cefpython3\locales" --log-file=debug.log --log-severity=info --resources-dir-path="<>\Anaconda3\lib\site-packages\cefpython3" --disable-gpu-shader-disk-cache /prefetch:1

[0312/104311.528:INFO:cef_log.cpp(8)] [Browser process] GetPyFrame(): underlying frame does not yet exist: browserId = 1, frameId = -4

[0312/104311.529:INFO:cef_log.cpp(8)] [Browser process] GetPyFrame(): underlying frame does not yet exist: browserId = 1, frameId = -4

[0312/104311.531:INFO:cef_log.cpp(8)] [Browser process] CefBrowser::CreateBrowserSync() succeeded

[0312/104311.532:INFO:cef_log.cpp(8)] [Browser process] CefBrowser window handle = 595526

[0312/104311.533:INFO:cef_log.cpp(8)] [Browser process] GetPyFrame(): underlying frame does not yet exist: browserId = 1, frameId = -4

[0312/104311.534:INFO:cef_log.cpp(8)] [Browser process] SendProcessMessage(): message=DoJavascriptBindings, arguments size=1

[0312/104311.534:INFO:cef_log.cpp(8)] [Browser process] MessageLoop()

[0312/104311.612:INFO:client_handler.cpp(40)] [Browser process] OnProcessMessageReceived(): OnContextCreated

[0312/104311.613:INFO:cef_log.cpp(8)] [Browser process] V8ContextHandler_OnContextCreated()

[0312/104311.614:INFO:cef_log.cpp(8)] [Browser process] GetPyFrame(): create new PyFrame, frameId=2

Answer 1

Javascript 绑定(bind)不应用于传输大数据。要发送大数据，请改用 http 请求。基本上要么使用 AJAX 请求并运行内部应用内 Web 服务器，要么使用资源处理程序，它允许在不运行 Web 服务器的情况下处理请求。

请参阅教程文档 >“Javascript 集成”>“使用 http 请求进行通信”部分(单击链接后向下滚动一点):

https://github.com/cztomczak/cefpython/blob/master/docs/Tutorial.md#javascript-integration

您可以尝试使用 javacript 绑定(bind)以较小的部分发送数据，但使用请求的性能会更好。

检查发送数据时应用内存的峰值情况。在 Linux 上使用进程监视器，在 Windows 上使用进程管理器。

要找出发送 200 MB 数据时失败的原因，请调试应用程序以获取堆栈跟踪。如果使用 Linux，则从发布页面下载带有调试符号的 libcef.so，标记为例如v66-上游。将cefpython3包中原来的libcef.so替换为该libcef.so。 GDB 命令可以在这里找到:

https://github.com/cztomczak/cefpython/blob/master/docs/Knowledge-Base.md#python-crashes-with-segmentation-fault---how-to-debug