具有 HTTP 触发器和 blob 输出绑定的 Azure 函数失败，返回 500，没有详细信息

Question

我正在尝试创建一个简单的 Azure 函数应用程序，它从 HTTP 请求接收图像二进制文件并使用 C# 和无服务器框架写入 blob 存储。

C#函数代码如下：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.WebJobs.Extensions.Storage;

namespace ThumbnailGenerator.Azure
{
    public static class ThumbnailGenerator
    {
        [FunctionName("upload")]
        [StorageAccount("AzureWebJobsStorage")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            [Blob("input/{name}", FileAccess.Write)] Stream inputImage,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            
            byte[] data = System.Convert.FromBase64String(requestBody);
            await inputImage.WriteAsync(data);

            return new OkObjectResult("Succeed:" + name);
        }
    }
}

我的 host.json 看起来如下：

{
    "version": "2.0",
    "logging": {
        "applicationInsights": {
            "samplingSettings": {
                "isEnabled": true,
                "excludedTypes": "Request"
            }
        }
    },
    "extensions": {
        "blobs": {
            "maxDegreeOfParallelism": "4"
        }
    }
}

应用程序是使用无服务器框架部署的

service: thumbnail-dotnet

frameworkVersion: '2'

provider:
  name: azure
  runtime: dotnet3.1
  region: East US

# List of plugins used by service. Must always include: - serverless-azure-functions
plugins:
  - serverless-azure-functions
  
functions:
  upload:
    handler: src/handlers/upload.main
    events:
      - http: true
        methods:
          - GET
        authLevel: anonymous

然而，当我测试它时，Azure 总是给出 500 Internal Server Error 没有任何细节。没有应用程序洞察跟踪，没有日志，执行计数也为零，这让我很困惑。

这是在 Azure

上生成的 function.json

{
  "generatedBy": "Microsoft.NET.Sdk.Functions-3.0.11",
  "configurationSource": "attributes",
  "bindings": [
    {
      "type": "httpTrigger",
      "methods": [
        "get",
        "post"
      ],
      "authLevel": "anonymous",
      "name": "req"
    }
  ],
  "disabled": false,
  "scriptFile": "../bin/ThumbnailGenerator.dll",
  "entryPoint": "ThumbnailGenerator.Azure.ThumbnailGenerator.Run"
}

我用不同的方法调试了一个星期都没有找到原因。

谁能给点提示？

Answer 1

如果我在本地运行您的代码，将显示以下异常：

Microsoft.Azure.WebJobs.Host: Error indexing method 'upload'. Microsoft.Azure.WebJobs.Host: Unable to resolve binding parameter 'name'. Binding expressions must map to either a value provided by the trigger or a property of the value the trigger is bound to, or must be a system binding expression (e.g. sys.randguid, sys.utcnow, etc.).

如错误消息中所述，您必须在触发器中指定变量。我想，在 Azure Functions 中仍然无法绑定到查询参数。

所以你必须在路由中指定它：

[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "{name}")] HttpRequest req,

运行本地：

upload: [GET,POST] http://localhost:7071/api/{name}

完整代码：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.WebJobs.Extensions.Storage;

namespace ThumbnailGenerator.Azure
{
    public static class ThumbnailGenerator
    {
        [FunctionName("upload")]
        [StorageAccount("AzureWebJobsStorage")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "{name}")] HttpRequest req,
            [Blob("input/{name}", FileAccess.Write)] Stream inputImage,
            string name,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();

            byte[] data = System.Convert.FromBase64String(requestBody);
            await inputImage.WriteAsync(data);

            return new OkObjectResult("Succeed:" + name);
        }
    }
}

请在GitHub

上找到工作代码

具有 HTTP 触发器和 blob 输出绑定的 Azure 函数失败，返回 500，没有详细信息

Azure function with HTTP trigger and blob output binding failed with 500 and no details

c#

azure

serverless-framework

azure-functions