private static async Task <byte[]> ExecuteDevToolsMethodInternalAsync(IChromiumWebView webview, string method, CefDictionaryValue parameters, CancellationToken cancellationToken)
{
CefBrowser browser = webview.BrowserObject;
if (browser is null)
{
throw new InvalidOperationException();
}
cancellationToken.ThrowIfCancellationRequested();
CefBrowserHost browserHost = browser.Host;
DevToolsProtocolClient protocolClient = GetProtocolClient(browserHost);
await CefNetSynchronizationContextAwaiter.GetForThread(CefThreadId.UI);
cancellationToken.ThrowIfCancellationRequested();
int messageId = browserHost.ExecuteDevToolsMethod(protocolClient.IncrementMessageId(), method, parameters);
protocolClient.UpdateLastMessageId(messageId);
DevToolsMethodResult r;
if (cancellationToken.CanBeCanceled)
{
Task <DevToolsMethodResult> waitTask = protocolClient.WaitForMessageAsync(messageId);
await Task.WhenAny(waitTask, Task.Delay(Timeout.Infinite, cancellationToken)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
r = waitTask.Result;
}
else
{
r = await protocolClient.WaitForMessageAsync(messageId).ConfigureAwait(false);
}
if (r.Success)
{
return(r.Result);
}
CefValue errorValue = CefApi.CefParseJSONBuffer(r.Result, CefJsonParserOptions.AllowTrailingCommas);
if (errorValue is null)
{
throw new DevToolsProtocolException($"An unknown error occurred while trying to execute the '{method}' method.");
}
throw new DevToolsProtocolException(errorValue.GetDictionary().GetString("message"));
}