正确使用Azure持久函数-序列化复杂对象

Azure持久功能

根据示例,我创建了一个 Orchestrator客户端 ( HelloOrchestratorClient.cs ),响应 HttpTrigger . 这个客户机从原始请求中提取一些信息,然后启动一个 Orchestrator函数 ( HelloOrchestrator.cs )传递一些提取的信息:

复杂的HelloOrchestratorClient.cs:

[FunctionName("HttpSyncStart")]
public static async Task<HttpResponseMessage> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, methods: "get", Route = "orchestrators/{functionName}/wait")]
    HttpRequestMessage req,
    [OrchestrationClient] DurableOrchestrationClient starter,
    string functionName,
    ILogger log)
{       
    HttpReq originalRequest = new HttpReq() {
            DeveloperId = GetDevKey(req,apiHeaderKey),
            QueryString = req.RequestUri.Query,
            APIName = GetQueryStringValue(req,APIName),
            APIVersion = GetQueryStringValue(req,APIVersion)

    };
    string instanceId =   await starter.StartNewAsync(functionName, originalRequest);

    TimeSpan timeout = GetTimeSpan(req, Timeout) ?? TimeSpan.FromSeconds(30);
    TimeSpan retryInterval = GetTimeSpan(req, RetryInterval) ?? TimeSpan.FromSeconds(1);

    return  await starter.WaitForCompletionOrCreateCheckStatusResponseAsync(
        req,
        instanceId,
        timeout,
        retryInterval);

}

这个 HelloOrchestrator.cs公司 现在只需调用一个内部API并返回一个 JsonProduct ActivityTigger 命名 HelloOrchestrator.APICall

复杂HelloOrchestrator.cs:

  [FunctionName("E1_JsonProduct")]
        public static async Task<List<JsonProduct>> Run(
            [OrchestrationTrigger] DurableOrchestrationContextBase context,
            ILogger log)
        {
            List<JsonProduct> output = new List<JsonProduct>();
            HttpReq r = context.GetInput<HttpReq>();
            if(r != null)
            {
                if(r.DeveloperId == null)
                {
                    return output;
                }
                output.Add(await context.CallActivityAsync<JsonProduct>("E1_CallAPI",r));
                return output;
            }
            return output;
        } 

[FunctionName("E1_CallAPI")]
public async static Task<JsonProduct> APICall([ActivityTrigger] HttpReq req,
    ILogger log)
{

    JsonProduct products  = null;
    string u = $"{baseAddress}{req.APIVersion}/{req.APIName}{req.QueryString}";  

    var request = new HttpRequestMessage(HttpMethod.Get, u);
    request.Headers.Accept.Add(
        new MediaTypeWithQualityHeaderValue("application/json")
    );
    request.Headers.Add("x-apikey",req.DeveloperId);
     log.LogInformation($"URL calling = '{request.RequestUri.AbsoluteUri}'.");
    HttpResponseMessage response = await client.SendAsync(request);
    // return await response.Content.ReadAsStringAsync();
    if(response.IsSuccessStatusCode)
    {
        var formatter = new JsonMediaTypeFormatter
        {
            SerializerSettings = HelloProj.CosmosDB.Models.Products.Converter.Settings
        };

        products = await response.Content.ReadAsAsync<JsonProduct>(new [] {formatter});
    }
    return products;
}

旁注:

我遇到的问题

所以,当我的 List<JsonProduct> HelloOrchestrator.Run ,我收到以下信息 NullReferenceException Gist (大堆栈跟踪)我收到一个 从 Orchestrator客户端

以下证明了 output 返回的在运行时确实有一个对象:

会不会是因为 here )? 我问,因为当我换掉我的 Orchestrator函数 不要

此示例显示 简单的Orchestrator函数 HelloOrchestrator.cs公司 ,返回一个简单的 TestToDo.cs Gist for model 不会出错

   [FunctionName("E1_Todo")]
    public static async Task<TestToDo> RunToDo(
    [OrchestrationTrigger] DurableOrchestrationContextBase context,
        ILogger log)
    {
        HttpReq r = context.GetInput<HttpReq>();
        TestToDo todo = new TestToDo();
        if(r != null)
        {
            todo = await context.CallActivityAsync<TestToDo>("E1_CallAPITodo",r);
        }
        return todo;
    }

[FunctionName("E1_CallAPITodo")]
public async static Task<TestToDo> APITodoCall([ActivityTrigger] HttpReq req,
    ILogger log)
{

    var request = new HttpRequestMessage(HttpMethod.Get, "https://jsonplaceholder.typicode.com/todos/1");
    request.Headers.Accept.Add(
        new MediaTypeWithQualityHeaderValue("application/json")
    );
     log.LogInformation($"URL calling = '{request.RequestUri.AbsoluteUri}'. for {req.QueryString}");
    HttpResponseMessage response = await client.SendAsync(request);
    return await response.Content.ReadAsAsync<TestToDo>();
} 

更多信息

如果你需要我的完整原型项目,你可以在这里找到它们:

• Complex Project (Throws 500 and exception)

当您运行它时,在Postman中使用以下命令(在f5之后):

http://localhost:7071/api/orchestrators/E1_JsonProduct/wait?timeout=20&retryInterval=0.25&api=products&apiVersion=v1&filterByImprints=W%26N&N

• Simple Project (No 500 or Exception thrown)

当您运行它时,在Postman中使用以下命令(在f5之后):

http://localhost:7071/api/orchestrators/E1_Todo/wait?timeout=20&retryInterval=0.25