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using Google.Protobuf;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Tango.PMR.Common;
using Tango.PMR.DataStore;
using Tango.PMR.Integration;
namespace Tango.PMR
{
/// <summary>
/// Contains helper class for encoding and decoding PMR messages.
/// </summary>
public static class MessageFactory
{
private static Dictionary<MessageType, Type> _pmrTypes;
private static Dictionary<DataStoreMessageType, Type> _pmrDataStoreTypes;
private static MethodInfo _parseTangoMessageMethod;
static MessageFactory()
{
_parseTangoMessageMethod = typeof(MessageFactory).GetMethod("ParseTangoMessage", BindingFlags.Public | BindingFlags.Static);
_pmrTypes = new Dictionary<MessageType, Type>();
var types = typeof(MessageFactory).Assembly.GetTypes().ToList();
foreach (var value in Enum.GetValues(typeof(MessageType)).OfType<MessageType>())
{
var type = types.SingleOrDefault(x => x.Name == value.ToOriginalName());
if (type != null)
{
_pmrTypes.Add(value, type);
}
}
_pmrDataStoreTypes = new Dictionary<DataStoreMessageType, Type>();
foreach (var value in Enum.GetValues(typeof(DataStoreMessageType)).OfType<DataStoreMessageType>())
{
var type = types.SingleOrDefault(x => x.Name == value.ToOriginalName());
if (type != null)
{
_pmrDataStoreTypes.Add(value, type);
}
}
}
/// <summary>
/// Returns the matching PMR type from the PMR message type.
/// </summary>
/// <param name="messageType">Type of the message.</param>
/// <returns></returns>
public static Type GetPMRTypeFromMessageType(MessageType messageType)
{
return _pmrTypes[messageType];
}
/// <summary>
/// Returns the matching PMR type from the PMR message type.
/// </summary>
/// <param name="messageType">Type of the message.</param>
/// <returns></returns>
public static Type GetDataStorePMRTypeFromDataStoreMessageType(DataStoreMessageType messageType)
{
return _pmrDataStoreTypes[messageType];
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>() where T : IMessage<T>
{
TangoMessage<T> tango = new TangoMessage<T>(Activator.CreateInstance<T>(), ParseMessageType(typeof(T).Name));
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(T message) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>();
tango.Message = message;
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(String token) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>();
tango.Container.Token = token;
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(T message, String token) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>(token);
tango.Message = message;
return tango;
}
/// <summary>
/// Parses the specified tango message type from the specified byte array.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static TangoMessage<T> ParseTangoMessage<T>(byte[] data) where T : IMessage<T>
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
MessageParser<T> parser = new MessageParser<T>(() => Activator.CreateInstance<T>());
TangoMessage<T> tango = new TangoMessage<T>(container, parser.ParseFrom(container.Data));
return tango;
}
/// <summary>
/// Parses the specified tango message type from the specified message container.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static TangoMessage<T> ParseTangoMessageFromContainer<T>(MessageContainer container) where T : IMessage<T>
{
MessageParser<T> parser = new MessageParser<T>(() => Activator.CreateInstance<T>());
TangoMessage<T> tango = new TangoMessage<T>(container, parser.ParseFrom(container.Data));
return tango;
}
/// <summary>
/// Parses an unknown tango message from the specified byte array.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public static ITangoMessage ParseTangoMessageAgnostic(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
IMessage message = ExtractMessageFromContainer(container);
return (ITangoMessage)_parseTangoMessageMethod.MakeGenericMethod(message.GetType()).Invoke(null, new[] { data });
}
/// <summary>
/// Parses the message from the specified container.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="container">The container.</param>
/// <returns></returns>
public static T ExtractMessageFromContainer<T>(MessageContainer container) where T : IMessage<T>
{
MessageParser<T> parser = new MessageParser<T>(() => Activator.CreateInstance<T>());
return parser.ParseFrom(container.Data);
}
/// <summary>
/// Parses the message from the specified container.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="container">The container.</param>
/// <returns></returns>
public static IMessage ExtractMessageFromContainer(MessageContainer container)
{
var type = _pmrTypes[container.Type];
MessageParser parser = type.GetProperty("Parser").GetValue(container) as MessageParser;
return parser.ParseFrom(container.Data);
}
/// <summary>
/// Parses a message container from the specified byte array.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public static MessageContainer ParseContainer(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
return container;
}
/// <summary>
/// Parses a message container from the specified byte array containing JSON data.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public static MessageContainer ParseContainerJson(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseJson(Encoding.UTF8.GetString(data));
return container;
}
/// <summary>
/// Parses the specified text to a PMR <see cref="MessageType"/>.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
/// <exception cref="InvalidCastException">Could not parse message type " + text</exception>
public static MessageType ParseMessageType(String text)
{
MessageType t;
if (Enum.TryParse<MessageType>(text, true, out t))
{
return t;
}
else
{
throw new InvalidCastException("Message type " + text + " was not found on PMR MessageType enumeration!");
}
}
/// <summary>
/// Parses the specified text to a PMR <see cref="MessageType"/>.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
/// <exception cref="InvalidCastException">Could not parse message type " + text</exception>
public static DataStoreMessageType ParseDataStoreMessageType(String text)
{
DataStoreMessageType t;
if (Enum.TryParse<DataStoreMessageType>(text, true, out t))
{
return t;
}
else
{
throw new InvalidCastException("Data Store Message type " + text + " was not found on PMR DataStoreMessageType enumeration!");
}
}
/// <summary>
/// Gets the available request stubs.
/// </summary>
/// <returns></returns>
public static List<Type> GetAvailableRequestStubs()
{
return typeof(MessageFactory).Assembly.GetTypes().Where(x => x.Namespace != null && x.Namespace.Contains("Stubs") && x.Name.Contains("Request") && !x.Name.Contains("Reflection")).ToList();
}
/// <summary>
/// Gets the available request & response stubs.
/// </summary>
/// <returns></returns>
public static List<Type> GetAvailableRequestResponseStubs()
{
return typeof(MessageFactory).Assembly.GetTypes().Where(x => x.Namespace != null && x.Namespace.Contains("Stubs") && !x.Name.Contains("Reflection")).ToList();
}
/// <summary>
/// Parses the proto message from the specified bytes. Requires the message type.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
public static IMessage ParseProtoMessage(byte[] data, Type type)
{
using (MemoryStream ms = new MemoryStream(data))
{
ms.Position = 0;
using (BinaryReader reader = new BinaryReader(ms))
{
IMessage message = Activator.CreateInstance(type) as IMessage;
MessageParser parser = type.GetProperty("Parser").GetValue(message) as MessageParser;
return parser.ParseFrom(data);
}
}
}
}
}
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