Azure Function Middleware: How to return a custom HTTP response?(Azure函数中间件:如何返回自定义HTTP响应?)
问题描述
我正在浏览在.net 5
上运行的Azure函数,我发现了新的middleware capabilities。
我已经构建了一个这样的虚拟中间件:
public sealed class ExceptionLoggingMiddleware : IFunctionsWorkerMiddleware
{
private readonly ILogger<ExceptionLoggingMiddleware> m_logger;
public ExceptionLoggingMiddleware(ILogger<ExceptionLoggingMiddleware> logger)
{
m_logger = logger;
}
public async Task Invoke(FunctionContext context, FunctionExecutionDelegate next)
{
try
{
await next(context);
}
catch (Exception unhandledException)
{
m_logger.LogCritical(unhandledException, "Unhandled exception caught: {UnhandledException}", unhandledException.Message);
}
}
}
在我的用例中,Azure函数是一个HTTP触发函数:
public sealed class StorageAccountsFunction
{
private readonly ILogger<StorageAccountsFunction> m_logger;
public StorageAccountsFunction
(
ILogger<StorageAccountsFunction> logger
)
{
m_logger = logger;
}
[Function("v1-post-storage-account")]
public async Task<HttpResponseData> CreateAsync
(
[HttpTrigger(AuthorizationLevel.Anonymous, "POST", Route = "v1/storage-accounts")]
HttpRequestData httpRequestData,
FunctionContext context
)
{
m_logger.LogInformation("Processing a request to create a new storage account");
throw new Exception("Oh no! Oh well..");
}
}
在.net core 3.1
上运行的My Function App中,每个函数都负责捕获未处理的异常(通过基类)并返回相应的HTTP状态代码。
我希望将该逻辑放在中间件中,以便将其集中起来,避免将来出现任何错误。
问题
该异常被中间件正确捕获。但是,我不知道如何更改响应并返回更合适的内容,而不是我现在得到的500 Internal Server Error
?
Azure
根据this issue的说法,目前没有与此相关的正式实现,但他们也提到了一个棘手的解决办法,直到将适当的功能直接实现到推荐答案函数中
我们为FunctionContext创建了扩展方法:
internal static class FunctionUtilities
{
internal static HttpRequestData GetHttpRequestData(this FunctionContext context)
{
var keyValuePair = context.Features.SingleOrDefault(f => f.Key.Name == "IFunctionBindingsFeature");
var functionBindingsFeature = keyValuePair.Value;
var type = functionBindingsFeature.GetType();
var inputData = type.GetProperties().Single(p => p.Name == "InputData").GetValue(functionBindingsFeature) as IReadOnlyDictionary<string, object>;
return inputData?.Values.SingleOrDefault(o => o is HttpRequestData) as HttpRequestData;
}
internal static void InvokeResult(this FunctionContext context, HttpResponseData response)
{
var keyValuePair = context.Features.SingleOrDefault(f => f.Key.Name == "IFunctionBindingsFeature");
var functionBindingsFeature = keyValuePair.Value;
var type = functionBindingsFeature.GetType();
var result = type.GetProperties().Single(p => p.Name == "InvocationResult");
result.SetValue(functionBindingsFeature, response);
}
}
中间件中的用法如下:
public async Task Invoke(FunctionContext context, FunctionExecutionDelegate next)
{
try
{
await next(context);
}
catch (Exception ex)
{
if (ex.InnerException is *NameOfExceptionYouNeed* e)
{
var req = context.GetHttpRequestData();
var res = await req.ErrorResponseAsync(e.Message);
context.InvokeResult(res);
return;
}
throw;
}
}
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本文标题为:Azure函数中间件:如何返回自定义HTTP响应?
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