How to consume a file with a ServiceStack client

Question

I am trying to use ServiceStack to return a file to a ServiceStack client in a RESTful manner.

I have read other questions on SO (here and here) which advise using HttpR

Answer 1

I had a similar requirement which also required me to track progress of the streaming file download. I did it roughly like this:

server-side:

service:

public object Get(FooRequest request)
{
    var stream = ...//some Stream
    return new StreamedResult(stream);
}

StreamedResult class:

public class StreamedResult : IHasOptions, IStreamWriter
{
    public IDictionary Options { get; private set; }
    Stream _responseStream;

    public StreamedResult(Stream responseStream)
    {
        _responseStream = responseStream;

        long length = -1;
        try { length = _responseStream.Length; }
        catch (NotSupportedException) { }

        Options = new Dictionary
        {
            {"Content-Type", "application/octet-stream"},
            { "X-Api-Length", length.ToString() }
        };
    }

    public void WriteTo(Stream responseStream)
    {
        if (_responseStream == null)
            return;

        using (_responseStream)
        {
            _responseStream.WriteTo(responseStream);
            responseStream.Flush();
        }
    }
}

client-side:

string path = Path.GetTempFileName();//in reality, wrap this in try... so as not to leave hanging tmp files
var response = client.Get("/foo/bar");

long length;
if (!long.TryParse(response.GetResponseHeader("X-Api-Length"), out length))
    length = -1;

using (var fs = System.IO.File.OpenWrite(path))
    fs.CopyFrom(response.GetResponseStream(), new CopyFromArguments(new ProgressChange((x, y) => { Console.WriteLine(">> {0} {1}".Fmt(x, y)); }), TimeSpan.FromMilliseconds(100), length));

The "CopyFrom" extension method was borrowed directly from the source code file "StreamHelper.cs" in this project here: Copy a Stream with Progress Reporting (Kudos to Henning Dieterichs)

And kudos to mythz and any contributor to ServiceStack. Great project!