在不同模块之间发送直接方法调用的最佳实践? [英] Best practices for sending a direct method call between different modules?

问题描述

嗨.我正在尝试在同一个IoT Edge运行时上运行的两个不同模块之间调用具有直接方法请求的方法.

Hi. I'm trying to invoke a method with a direct method request between two different modules running on the same IoT Edge runtime.

我们叫模块ModuleA和ModuleB.

Let's call the modules ModuleA and ModuleB.

模块A具有称为代理"的直接方法.该请求将请求发送到称为"Sample1"的方法.在ModuleB中.

ModuleA have a direct method called "Proxy" that will send a request to a method called "Sample1" in ModuleB.

代理"方法在ModuleA的Init()函数中注册为:

The "Proxy" method is registered in the Init() function of ModuleA as:

await ioTHubModuleClient.SetMethodHandlerAsync("Proxy", Proxy, ioTHubModuleClient);

该方法本身看起来像:

static async Task<MethodResponse> Proxy(MethodRequest methodRequest, object moduleClient)
{
            ModuleClient ioTHubModuleClient = (ModuleClient)moduleClient;

            MethodRequest request = new MethodRequest("Sample1", Encoding.UTF8.GetBytes("{ \"Message\": \"Hello\" }"));
            var resp = await ioTHubModuleClient.InvokeMethodAsync("my-iot-edge-device-id", "moduleB", request);

            return resp;
}

因此，我正在尝试调用方法"Sample1".位于ModuleB中.

I'm thus trying to invoke the method "Sample1" located in ModuleB.

ModuleB中的Sample1方法定义为:

The Sample1 method in ModuleB is defined as:

private static Task<MethodResponse> Sample1(MethodRequest methodRequest, object userContext)
{
            // Get data. We're not actually doing anything with this...
            var data = Encoding.UTF8.GetString(methodRequest.Data);
            

            // Print data sent to this method...
            Console.WriteLine(data.ToString());


            // Create and return method response
            var methodResponse = new MethodResponse(Encoding.UTF8.GetBytes("{\"status\": \"ok\"}"), 200);
            return Task.FromResult(methodResponse);
}

我从Azure门户调用名为代理"的方法.在ModuleA模块中，有效载荷为{}.

From Azure portal I invoke the method named "Proxy" in the ModuleA module with an empty payload of {} .

我的问题是ModuleA中的Proxy方法崩溃，但例外:

My issue is that the Proxy method in ModuleA crashes with the exception:

Exception thrown: 'Microsoft.Azure.Devices.Client.Exceptions.IotHubCommunicationException' in System.Private.CoreLib.dll

在线

var resp = await ioTHubModuleClient . InvokeMethodAsync(...

var resp = await ioTHubModuleClient.InvokeMethodAsync(...

推荐答案

您好，FredrikoPettersson，

Hello FredrikoPettersson,

我没有重现该错误.但是我遇到了以下错误.

I have not reproduced the error. But I encountered the following error.

Call Proxy Method.
   at Microsoft.Azure.Devices.Client.Transport.HttpClientHelper.<ExecuteAsync>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Azure.Devices.Client.Transport.HttpClientHelper.<PostAsync>d__17`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Azure.Devices.Client.ModuleClient.<InvokeMethodAsync>d__57.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SampleModuleA.Program.<Proxy>d__4.MoveNext() in /app/Program.cs:line 71

如果我没有在ModuleB中注册 Sample1 方法，那么将不会有任何错误信息.

If I don't register the Sample1 method in ModuleB, there will be no any error information.

await ioTHubModuleClient.SetMethodHandlerAsync("Sample1", Sample1, ioTHubModuleClient);

您可以参考这篇文章，它展示了如何使用Visual Studio Code通过Azure IoT Edge调试多个模块.

You can refer this article, it shows how to use Visual Studio Code to debug multiple modules with Azure IoT Edge.

最好的问候，

迈克尔

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