/// <summary>
/// Instantiates the <see cref="NativeJavaScriptExecutor"/>.
/// </summary>
/// <param name="useSerialization">true to use serialization, else false.</param>
public NativeJavaScriptExecutor(bool useSerialization)
{
_executor = new ChakraBridge.NativeJavaScriptExecutor();
Native.ThrowIfError((JavaScriptErrorCode)_executor.InitializeHost());
_useSerialization = useSerialization;
}
/// <summary>
/// Runs the JavaScript at the given path.
/// </summary>
/// <param name="sourcePath">The source path.</param>
/// <param name="sourceUrl">The source URL.</param>
public void RunScript(string sourcePath, string sourceUrl)
{
if (sourcePath == null)
{
throw new ArgumentNullException(nameof(sourcePath));
}
if (sourceUrl == null)
{
throw new ArgumentNullException(nameof(sourceUrl));
}
try
{
var binPath = Path.Combine(ApplicationData.Current.LocalFolder.Path, BytecodeFileName);
if (_useSerialization)
{
var srcFileInfo = new FileInfo(sourcePath);
var binFileInfo = new FileInfo(binPath);
bool ranSuccessfully = false;
// The idea is to run the JS bundle and generate bytecode for it on a background thread.
// This eliminates the need to delay the first start when the app doesn't have bytecode.
// Next time the app starts, it checks if bytecode is still good and runs it directly.
if (binFileInfo.Exists && binFileInfo.LastWriteTime > srcFileInfo.LastWriteTime)
{
try
{
Native.ThrowIfError((JavaScriptErrorCode)_executor.RunSerializedScript(sourcePath, binPath, sourceUrl));
ranSuccessfully = true;
}
catch (JavaScriptUsageException exc)
{
if (exc.ErrorCode == JavaScriptErrorCode.BadSerializedScript)
{
// Bytecode format is dependent on Chakra engine version, so an OS upgrade may require a recompilation
RnLog.Warn(ReactConstants.RNW, $"Serialized bytecode script is corrupted or wrong format, will generate new one");
}
else
{
// Some more severe error. We still have a chance (recompiling), so we keep continuing.
RnLog.Error(ReactConstants.RNW, exc, $"Failed to run serialized bytecode script, will generate new one");
}
File.Delete(binPath);
}
}
else
{
RnLog.Info(ReactConstants.RNW, $"Serialized bytecode script doesn't exist or is obsolete, will generate one");
}
if (!ranSuccessfully)
{
Task.Run(() =>
{
try
{
// In Chakra JS engine, only one runtime can be active on a particular thread at a time,
// and a runtime can only be active on one thread at a time. However it's possible to
// create two runtimes and let them run on different threads.
var rt = new ChakraBridge.NativeJavaScriptExecutor();
Native.ThrowIfError((JavaScriptErrorCode)rt.InitializeHost());
Native.ThrowIfError((JavaScriptErrorCode)rt.SerializeScript(sourcePath, binPath));
Native.ThrowIfError((JavaScriptErrorCode)rt.DisposeHost());
}
catch (Exception ex)
{
RnLog.Error(ReactConstants.RNW, ex, $"Failed to generate serialized bytecode script.");
// It's fine if the bytecode couldn't be generated: RN can still use the JS bundle.
}
});
Native.ThrowIfError((JavaScriptErrorCode)_executor.RunScript(sourcePath, sourceUrl));
}
}
else
{
Native.ThrowIfError((JavaScriptErrorCode)_executor.RunScript(sourcePath, sourceUrl));
}
}
catch (JavaScriptScriptException ex)
{
var jsonError = JavaScriptValueToJTokenConverter.Convert(ex.Error);
var message = jsonError.Value <string>("message");
var stackTrace = jsonError.Value <string>("stack");
throw new Modules.Core.JavaScriptException(message ?? ex.Message, stackTrace, ex);
}
}