具有HTTP触发器和blob输出绑定的Azure函数失败，错误为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，该应用程序从HTTP请求接收图像二进制文件，并使用C#和Serverless Framework写入blob存储。

C#函数代码如下所示：

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如下所示：

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

该应用程序使用无服务器框架进行部署

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，这对我来说真的很困惑

这是Azure 上生成的函数.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"
}

一周来，我一直在尝试不同的方法来调试它，但找不到原因。

有人能给点建议吗？

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:索引方法"upload"时出错。Microsoft.Azure.WebJobs.Host:无法解析绑定参数"name"。绑定表达式必须映射到触发器提供的值或触发器绑定到的值的属性，或者必须是系统绑定表达式(例如sys.randguid、sys.utcnow等(

如错误消息中所述，您必须在触发器中指定变量。我想，绑定到查询参数在Azure函数中仍然是不可能的。

所以你必须在路线中指定它：

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

在本地运行：

上传：[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