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path: root/Software/Visual_Studio/Web/Tango.MachineService/ProtoBufFormatter.cs
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128pre { line-height: 125%; }
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.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.
using Google.Protobuf;
using System;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using System.Web.Http;
using Tango.PMR.Stubs;
using Tango.PMR.Synchronization;

namespace Tango.MachineService
{
    /// <summary>
    /// Represents a protobuf web request/response formatter capable of formatting messages using protobuf.
    /// </summary>
    /// <seealso cref="System.Net.Http.Formatting.MediaTypeFormatter" />
    public class ProtoBufFormatter : MediaTypeFormatter
    {
        private static readonly MediaTypeHeaderValue mediaType = new MediaTypeHeaderValue("application/x-protobuf");

        /// <summary>
        /// Initializes a new instance of the <see cref="ProtoBufFormatter"/> class.
        /// </summary>
        public ProtoBufFormatter()
        {
            SupportedMediaTypes.Add(mediaType);
        }

        /// <summary>
        /// Gets the default type of the media.
        /// </summary>
        /// <value>
        /// The default type of the media.
        /// </value>
        public static MediaTypeHeaderValue DefaultMediaType
        {
            get { return mediaType; }
        }

        /// <summary>
        /// Queries whether this <see cref="T:System.Net.Http.Formatting.MediaTypeFormatter" /> can deserializean object of the specified type.
        /// </summary>
        /// <param name="type">The type to deserialize.</param>
        /// <returns>
        /// true if the <see cref="T:System.Net.Http.Formatting.MediaTypeFormatter" /> can deserialize the type; otherwise, false.
        /// </returns>
        public override bool CanReadType(Type 
">} /// <summary> /// Queries whether this <see cref="T:System.Net.Http.Formatting.MediaTypeFormatter" /> can serializean object of the specified type. /// </summary> /// <param name="type">The type to serialize.</param> /// <returns> /// true if the <see cref="T:System.Net.Http.Formatting.MediaTypeFormatter" /> can serialize the type; otherwise, false. /// </returns> public override bool CanWriteType(Type type) { return true; } /// <summary> /// Reads from stream asynchronous. /// </summary> /// <param name="type">The type.</param> /// <param name="stream">The stream.</param> /// <param name="content">The content.</param> /// <param name="formatterLogger">The formatter logger.</param> /// <returns></returns> public override Task<object> ReadFromStreamAsync(Type type, Stream stream, HttpContent content, IFormatterLogger formatterLogger) { var tcs = new TaskCompletionSource<object>(); try { MessageParser parser = type.GetProperty("Parser").GetValue(null, null) as MessageParser; IMessage req = parser.ParseFrom(stream); tcs.SetResult(req); } catch (Exception ex) { tcs.SetException(ex); } return tcs.Task; } /// <summary> /// Writes to stream asynchronous. /// </summary> /// <param name="type">The type.</param> /// <param name="value">The value.</param> /// <param name="stream">The stream.</param> /// <param name="content">The content.</param> /// <param name="transportContext">The transport context.</param> /// <returns></returns> public override Task WriteToStreamAsync(Type type, object value, Stream stream, HttpContent content, TransportContext transportContext) { var tcs = new TaskCompletionSource<object>(); if (value is IMessage) { try { (value as IMessage).WriteTo(stream); tcs.SetResult(null); } catch (Exception ex) { tcs.SetException(ex); } return tcs.Task; } else if (value is HttpError) { var httpError = value as HttpError; try { HttpProtoException msg = new HttpProtoException(); msg.Message = httpError.ExceptionMessage; msg.StatusCode = (int)HttpStatusCode.InternalServerError; msg.WriteTo(stream); tcs.SetResult(null); } catch (Exception ex) { tcs.SetException(ex); } return tcs.Task; } return base.WriteToStreamAsync(type, value, stream, content, transportContext); } } }