private static DevToolsProtocolClient GetProtocolClient(CefBrowserHost browserHost)
{
if (browserHost is null)
{
throw new ArgumentNullException(nameof(browserHost));
}
DevToolsProtocolClient client;
long browserId = browserHost.Browser.Identifier;
lock (_Clients)
{
if (!_Clients.TryGetValue(browserId, out client))
{
var webview = browserHost.Client.GetWebView() as IChromiumWebViewPrivate;
if (webview is null)
{
throw new InvalidOperationException("This browser is not associated with a WebView control.");
}
client = new DevToolsProtocolClient(webview);
_Clients.Add(browserId, client);
}
}
return(client);
}
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"));
}
/// <summary>
/// Returns a WebView control for this <see cref="CefBrowser"/>.
/// </summary>
/// <param name="browser">The <see cref="CefBrowser"/> object.</param>
/// <returns>An <see cref="IChromiumWebView"/> object associated with this client or null.</returns>
public static IChromiumWebView GetWebView(this CefBrowser browser)
{
if (browser is null)
{
throw new ArgumentNullException(nameof(browser));
}
CefBrowserHost host = browser.Host;
if (host is null)
{
return(null);
}
CefClient client = host.Client;
if (client is null)
{
return(null);
}
return(GetWebView(client));
}
/// <summary>
/// Returns a number that uniquely identifies the DevTools Protocol message.
/// </summary>
/// <param name="browserHost">The browser instance.</param>
/// <returns>A number that uniquely identifies the protocol message.</returns>
public static int GetNextDevToolsMessageId(this CefBrowserHost browserHost)
{
return(GetProtocolClient(browserHost).IncrementMessageId());
}