如何在控制器中注入HttpHeader值? [英] How to inject HttpHeader value in controller?

问题描述

我有使用ASP.NET Core API开发的Web API.每个传入请求都插入了一个自定义标头值.例如x-correlationid.控制器使用该值记录和跟踪请求. 目前，我正在如下读取每个控制器中的值

I have Web API developed using ASP.NET Core API. Every incoming request has a custom header value inserted. eg x-correlationid. The controller use this value for logging and tracing the request. Currently I'm reading the value in each controller as below

[Route("api/[controller]")]
public class DocumentController : Controller
{
    private ILogger<TransformController> _logger;
    private string _correlationid = null;

    public DocumentController(ILogger<DocumentController > logger)
    {
        _logger = logger;
        _correlationid = HttpContext.Request.Headers["x-correlationid"];
    }

    [HttpPost]
    public async Task<intTransform([FromBody]RequestWrapper request)
    {
        _logger.LogInformation("Start task. CorrelationId:{0}", _correlationid);

         // do something here

        _logger.LogInformation("End task. CorrelationId:{0}", _correlationid);

        return result;
    }
}

我认为这违反了DI规则.

I think this is against DI rules.

我希望将值注入控制器的构造函数中，而不是读取控制器的构造函数中的值.
或
中间件能否读取x-correlationid和*somehow*使其对所有控制器可用，所以我们不必将其注入任何控制器中?

Instead of reading the value inside the controller's constructor, I want to inject the value in the controller's constructor.
Or
Can middleware read the x-correlationid and *somehow* make it available to all the controllers so we don't have to inject it in any controller?

这里有什么更好的选择?

What would be a better option here?

推荐答案

这是我想到的.我想我也可以对其进行单元测试.

This is what I came up with. I think i can also unit test it.

public interface IRequestContext
{
    string CorrelationId { get; }
}

public sealed class RequestContextAdapter : IRequestContext
{
    private readonly IHttpContextAccessor _accessor;
    public RequestContextAdapter(IHttpContextAccessor accessor)
    {
        this._accessor = accessor;
    }

    public string CorrelationId
    {
        get
        {
            return this._accessor.HttpContext.Request.Headers[Constants.CORRELATIONID_KEY];
        }
    }
}

然后在启动程序的configureservice方法中注册适配器

then in startup's configureservice method register the adapter

 services.AddSingleton<IRequestContext, RequestContextAdapter>();

并将其注入控制器

[Route("api/[controller]")]
public class DocumentController : Controller
{
    private ILogger<TransformController> _logger;
    private IRequestContext _requestContext = null;

    public DocumentController(ILogger<DocumentController > logger,IRequestContext requestContext)
    {
        _logger = logger;
        _requestContext = requestContext;
    }

    [HttpPost]
    public async Task<intTransform([FromBody]RequestWrapper request)
    {
        _logger.LogInformation("Start task. CorrelationId:{0}", _requestContext.CorrelationId);

         // do something here

        _logger.LogInformation("End task. CorrelationId:{0}", _requestContext.CorrelationId);

        return result;
    }
}

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