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//Copyright (c) Service Stack LLC. All Rights Reserved.
//License: https://raw.github.com/ServiceStack/ServiceStack/master/license.txt
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading.Tasks;
using MediaBrowser.Model.Services;
namespace ServiceStack.Host
{
public static class ServiceExecExtensions
{
public static IEnumerable<MethodInfo> GetActions(this Type serviceType)
{
foreach (var mi in serviceType.GetRuntimeMethods().Where(i => i.IsPublic && !i.IsStatic))
{
if (mi.GetParameters().Length != 1)
continue;
var actionName = mi.Name.ToUpper();
if (!HttpMethods.AllVerbs.Contains(actionName) && actionName != ActionContext.AnyAction)
continue;
yield return mi;
}
}
}
internal static class ServiceExecGeneral
{
public static Dictionary<string, ActionContext> execMap = new Dictionary<string, ActionContext>();
public static void CreateServiceRunnersFor(Type requestType, List<ActionContext> actions)
{
foreach (var actionCtx in actions)
{
if (execMap.ContainsKey(actionCtx.Id)) continue;
execMap[actionCtx.Id] = actionCtx;
}
}
public static async Task<object> Execute(Type serviceType, IRequest request, object instance, object requestDto, string requestName)
{
var actionName = request.Verb
?? HttpMethods.Post; //MQ Services
ActionContext actionContext;
if (ServiceExecGeneral.execMap.TryGetValue(ActionContext.Key(serviceType, actionName, requestName), out actionContext)
|| ServiceExecGeneral.execMap.TryGetValue(ActionContext.AnyKey(serviceType, requestName), out actionContext))
{
if (actionContext.RequestFilters != null)
{
foreach (var requestFilter in actionContext.RequestFilters)
{
requestFilter.RequestFilter(request, request.Response, requestDto);
if (request.Response.IsClosed) return null;
}
}
var response = actionContext.ServiceAction(instance, requestDto);
var taskResponse = response as Task;
if (taskResponse != null)
{
await taskResponse.ConfigureAwait(false);
response = ServiceStackHost.Instance.GetTaskResult(taskResponse, requestName);
}
return response;
}
var expectedMethodName = actionName.Substring(0, 1) + actionName.Substring(1).ToLower();
throw new NotImplementedException(string.Format("Could not find method named {1}({0}) or Any({0}) on Service {2}", requestDto.GetType().GetOperationName(), expectedMethodName, serviceType.GetOperationName()));
}
public static List<ActionContext> Reset(Type serviceType)
{
var actions = new List<ActionContext>();
foreach (var mi in serviceType.GetActions())
{
var actionName = mi.Name.ToUpper();
var args = mi.GetParameters();
var requestType = args[0].ParameterType;
var actionCtx = new ActionContext
{
Id = ActionContext.Key(serviceType, actionName, requestType.GetOperationName())
};
try
{
actionCtx.ServiceAction = CreateExecFn(serviceType, requestType, mi);
}
catch
{
//Potential problems with MONO, using reflection for fallback
actionCtx.ServiceAction = (service, request) =>
mi.Invoke(service, new[] { request });
}
var reqFilters = new List<IHasRequestFilter>();
foreach (var attr in mi.GetCustomAttributes(true))
{
var hasReqFilter = attr as IHasRequestFilter;
if (hasReqFilter != null)
reqFilters.Add(hasReqFilter);
}
if (reqFilters.Count > 0)
actionCtx.RequestFilters = reqFilters.OrderBy(i => i.Priority).ToArray();
actions.Add(actionCtx);
}
return actions;
}
private static ActionInvokerFn CreateExecFn(Type serviceType, Type requestType, MethodInfo mi)
{
var serviceParam = Expression.Parameter(typeof(object), "serviceObj");
var serviceStrong = Expression.Convert(serviceParam, serviceType);
var requestDtoParam = Expression.Parameter(typeof(object), "requestDto");
var requestDtoStrong = Expression.Convert(requestDtoParam, requestType);
Expression callExecute = Expression.Call(
serviceStrong, mi, requestDtoStrong);
if (mi.ReturnType != typeof(void))
{
var executeFunc = Expression.Lambda<ActionInvokerFn>
(callExecute, serviceParam, requestDtoParam).Compile();
return executeFunc;
}
else
{
var executeFunc = Expression.Lambda<VoidActionInvokerFn>
(callExecute, serviceParam, requestDtoParam).Compile();
return (service, request) =>
{
executeFunc(service, request);
return null;
};
}
}
}
}
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