我希望使用IRequiresRequestStream
接口来启用使用ServiceStack(v3)和分块传输编码的大文件上传(视频文件)。标准文件上传似乎无法应对客户上传的一些较大的视频文件,因此我们希望为这些文件启用分块传输编码。
我已成功测试了分块传输编码文件上传,但还有许多参数需要与文件一起发送。
由于IRequiresRequestStream
绕过了ServiceStack请求对象解析器,因此显然没有填充请求对象中与Stream
一起的任何其他参数。作为一种解决方法,我可以看到以下选项:
this.Request.QueryString
集合访问this.Request.Headers
集合访问RequestBinder
访问?我已经设法实现了选项1和2,但不知何故感觉还不够RESTful。我更喜欢使用Path -> RequestDTO
,但我正在与RequestBinder
挣扎。
服务:
public object Any(AttachmentStreamRequest request)
{
byte[] fileBytes = null;
using (var stream = new MemoryStream())
{
request.RequestStream.WriteTo(stream);
length = stream.Length;
fileBytes = stream.ToArray();
}
string filePath = @"D:\temp\test.dat";
File.WriteAllBytes(filePath, fileBytes);
var hash = CalculateMd5(filePath);
var requestHash = this.Request.QueryString["Hash"];
var customerId = this.Request.QueryString["CustomerId"];
var fileName = this.Request.QueryString["FileName"];
// nicer would be
// var requestHash = request.Hash;
// var customerId = request.CustomerId;
// save file....
// return response
return requestHash == hash
? new HttpResult("File Valid", HttpStatusCode.OK)
: new HttpResult("Invalid Hash", HttpStatusCode.NotAcceptable);
}
请求:
[Route("/upload/{CustomerId}/{Hash}", "POST", Summary = @"POST Upload attachments for a customer", Notes = "Upload customer attachments")]
public class AttachmentStreamRequest : IRequiresRequestStream
{
// body
public Stream RequestStream { get; set; }
// path
public int CustomerId { get; set; }
// query
public string FileName { get; set; }
// query
public string Comment { get; set; }
// query
public Guid? ExternalId { get; set; }
// path
public string Hash { get; set; }
}
Web客户端:
private static async Task<string> SendUsingWebClient(byte[] file, string hash, customerId)
{
var client = (HttpWebRequest)WebRequest.Create(string.Format("http://localhost.fiddler:58224/upload/{0}/{1}", customerId, hash));
client.Method = WebRequestMethods.Http.Post;
client.Headers.Add("Cookie", "ss-pid=XXXXXXXXXXX; ss-id=YYYYYYYYYY");
// the following 4 rows enable streaming
client.AllowWriteStreamBuffering = false;
client.SendChunked = true;
client.ContentType = "application/json";
client.Timeout = int.MaxValue;
using (var fileStream = new MemoryStream(file))
{
fileStream.Copy(client.GetRequestStream());
}
return new StreamReader(client.GetResponse().GetResponseStream()).ReadToEnd();
}
我猜这个简单的方向是沿着以下几点,但它看起来像一个kludge。
RequestBinders.Add(typeof(AttachmentStreamRequest), httpReq => {
var dto = new AttachmentStreamRequest();
var segments = base.Request.PathInfo.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
dto.CustomerId = segments[1].As<int32>();
dto.Hash = segments[2].As<string>();
// Stream copy to dto.RequestStream and other params etc....
return dto;
});
在这种情况下,我已经做了一些谷歌搜索,以获取RequestBinders
的例子。我确信必须有内置的ServiceStack方法来解析Path
,但我正在努力解决它。有没有人有他们想分享的例子?
最近我还研究了使用自定义标头的Chunked传输。不幸的是,我发现它在HttpWebRequest类和一般的.NET Framework中都不支持开箱即用。对我有用的唯一解决方案是通过TCP实现Chunked Transfer HTTP通信。它并不像在开始时听起来那么复杂。您只需打开TCP客户端连接,根据需要格式化标头,按块拆分流并发送。
以下是Chunked Transfer协议的定义:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Transfer-Encoding