Question

我正在使用Magick.NET调整大小并将图像保存到AWS S3。我有一个Lambda无服务器Web API，它可以接收请求来执行此操作。在本地运行时，它可以正常工作，但在Lambda上调用实时终结点时则不能。我收到以下异常：

{
    "Timestamp": "2018-08-31T09:26:40.2561647+00:00",
    "Level": "Error",
    "MessageTemplate": "### Error resizing image. ###",
    "Exception": "ImageMagick.MagickMissingDelegateErrorException: NoDecodeDelegateForThisImageFormat `' @ error/blob.c/BlobToImage/456\n   at TAP.Services.TourManagementService.<AddImage>d__24.MoveNext() in C:\\######\\TourManagementService.cs:line 180\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at TAP.API.Tours.Controllers.ImagesController.<Post>d__3.MoveNext() in C:\\######\\ImagesController.cs:line 44\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext()\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__10.MoveNext()\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeInnerFilterAsync>d__14.MoveNext()\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeNextExceptionFilterAsync>d__23.MoveNext()",
    "Properties": {
        "ExceptionDetail": {
            "HResult": -2146233088,
            "Message": "NoDecodeDelegateForThisImageFormat `' @ error/blob.c/BlobToImage/456",
            "Source": "Magick.NET-Q16-AnyCPU",
            "RelatedExceptions": [
                {
                    "RelatedExceptions": [],
                    "Message": "UnableToOpenConfigureFile `magic.xml' @ warning/configure.c/GetConfigureOptions/714",
                    "Data": {},
                    "InnerException": null,
                    "TargetSite": null,
                    "StackTrace": null,
                    "HelpLink": null,
                    "Source": null,
                    "HResult": -2146233088
                }
            ],
            "Type": "ImageMagick.MagickMissingDelegateErrorException"
        }
    }
}

我要上传的图像在这里：https://wetransfer.com/downloads/6e86e0008b49ac29399c8cc2103c667820180831084315/99efdf，而我使用Magick.NET的代码如下：

private byte[] resizeImage(byte[] imageData, int width, int height)
{
    using (var image = new MagickImage(imageData, new MagickReadSettings { Format = MagickFormat.Jpeg }))
    {
        image.Format = MagickFormat.Jpeg;
        image.Interlace = Interlace.Jpeg; // Make image progressive

        var geometry = new MagickGeometry(width, height);
        geometry.FillArea = true;

        try
        {
            image.Resize(geometry);
            image.Crop(width, height);
            image.RePage();
        }
        catch (Exception ex)
        {
            this.logger.Error(ex, "Error resizing image.");
            throw new ImageResizeException("Error resizing image.", ex);
        }

        return image.ToByteArray();
    }
}

在尝试从本地文件读取之前，我在使用Lambda时遇到问题，因此我认为UnableToOpenConfigureFile可能是一个类似的问题。然后，我使用GitHub指南（https://github.com/dlemstra/Magick.NET/blob/master/Documentation/Initialization.md）通过代码而不是像下面那样依赖.xml文件来初始化MagickNET：

var configFiles = ConfigurationFiles.Default;
configFiles.Policy.Data = @"
    <policymap>
      <policy domain=""delegate"" rights=""none"" pattern=""*"" />
      <policy domain=""coder"" rights=""none"" pattern=""*"" />
      <policy domain=""coder"" rights=""read|write"" pattern=""{GIF,JPEG,PNG,WEBP}"" />
    </policymap>";
MagickNET.Initialize(configFiles);

...但是可悲的是，这并没有改变任何东西，我仍然遇到相同的错误。正如我所说，这一切在本地都可以正常工作，这使我认为这是环境问题。

编辑：

我也刚刚尝试将xml文件包含在项目中，然后直接发布它们。

通过执行此操作，我需要告诉Magick.NET在哪里找到文件，因此我尝试使用Lambda中的环境变量MAGICK_CONFIGURE_PATH（已将其设置为“ / MagickNet”）进行处理。我尝试的另一种方法是像这样在MagickNET.Initialize中设置路径：

MagickNET.Initialize("./MagickNet");

这也没有帮助我。

'NoDecodeDelegateForThisImageFormat'-AWS Lambda Serverless API中的Magick.NET

0 个答案: