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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading.Tasks;
using Emby.Server.Implementations.HttpServer;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Services;
namespace Emby.Server.Implementations.Services
{
public delegate Task<object> InstanceExecFn(IRequest requestContext, object intance, object request);
public delegate object ActionInvokerFn(object intance, object request);
public delegate void VoidActionInvokerFn(object intance, object request);
public class ServiceController
{
public static ServiceController Instance;
private readonly Func<IEnumerable<Type>> _resolveServicesFn;
public ServiceController(Func<IEnumerable<Type>> resolveServicesFn)
{
Instance = this;
_resolveServicesFn = resolveServicesFn;
}
public void Init(HttpListenerHost appHost)
{
foreach (var serviceType in _resolveServicesFn())
{
RegisterService(appHost, serviceType);
}
}
private Type[] GetGenericArguments(Type type)
{
return type.GetTypeInfo().IsGenericTypeDefinition
? type.GetTypeInfo().GenericTypeParameters
: type.GetTypeInfo().GenericTypeArguments;
}
public void RegisterService(HttpListenerHost appHost, Type serviceType)
{
var processedReqs = new HashSet<Type>();
var actions = ServiceExecGeneral.Reset(serviceType);
foreach (var mi in serviceType.GetActions())
{
var requestType = mi.GetParameters()[0].ParameterType;
if (processedReqs.Contains(requestType)) continue;
processedReqs.Add(requestType);
ServiceExecGeneral.CreateServiceRunnersFor(requestType, actions);
var returnMarker = GetTypeWithGenericTypeDefinitionOf(requestType, typeof(IReturn<>));
var responseType = returnMarker != null ?
GetGenericArguments(returnMarker)[0]
: mi.ReturnType != typeof(object) && mi.ReturnType != typeof(void) ?
mi.ReturnType
: Type.GetType(requestType.FullName + "Response");
RegisterRestPaths(appHost, requestType);
appHost.AddServiceInfo(serviceType, requestType, responseType);
}
}
private static Type GetTypeWithGenericTypeDefinitionOf(Type type, Type genericTypeDefinition)
{
foreach (var t in type.GetTypeInfo().ImplementedInterfaces)
{
if (t.GetTypeInfo().IsGenericType && t.GetGenericTypeDefinition() == genericTypeDefinition)
{
return t;
}
}
var genericType = FirstGenericType(type);
if (genericType != null && genericType.GetGenericTypeDefinition() == genericTypeDefinition)
{
return genericType;
}
return null;
}
public static Type FirstGenericType(Type type)
{
while (type != null)
{
if (type.GetTypeInfo().IsGenericType)
return type;
type = type.GetTypeInfo().BaseType;
}
return null;
}
public readonly Dictionary<string, List<RestPath>> RestPathMap = new Dictionary<string, List<RestPath>>(StringComparer.OrdinalIgnoreCase);
public void RegisterRestPaths(HttpListenerHost appHost, Type requestType)
{
var attrs = appHost.GetRouteAttributes(requestType);
foreach (RouteAttribute attr in attrs)
{
var restPath = new RestPath(appHost.CreateInstance, appHost.GetParseFn, requestType, attr.Path, attr.Verbs, attr.Summary, attr.Notes);
if (!restPath.IsValid)
throw new NotSupportedException(string.Format(
"RestPath '{0}' on Type '{1}' is not Valid", attr.Path, requestType.GetMethodName()));
RegisterRestPath(restPath);
}
}
private static readonly char[] InvalidRouteChars = new[] { '?', '&' };
public void RegisterRestPath(RestPath restPath)
{
if (!restPath.Path.StartsWith("/"))
throw new ArgumentException(string.Format("Route '{0}' on '{1}' must start with a '/'", restPath.Path, restPath.RequestType.GetMethodName()));
if (restPath.Path.IndexOfAny(InvalidRouteChars) != -1)
throw new ArgumentException(string.Format("Route '{0}' on '{1}' contains invalid chars. " +
"See https://github.com/ServiceStack/ServiceStack/wiki/Routing for info on valid routes.", restPath.Path, restPath.RequestType.GetMethodName()));
List<RestPath> pathsAtFirstMatch;
if (!RestPathMap.TryGetValue(restPath.FirstMatchHashKey, out pathsAtFirstMatch))
{
pathsAtFirstMatch = new List<RestPath>();
RestPathMap[restPath.FirstMatchHashKey] = pathsAtFirstMatch;
}
pathsAtFirstMatch.Add(restPath);
}
public RestPath GetRestPathForRequest(string httpMethod, string pathInfo, ILogger logger)
{
var matchUsingPathParts = RestPath.GetPathPartsForMatching(pathInfo);
List<RestPath> firstMatches;
var yieldedHashMatches = RestPath.GetFirstMatchHashKeys(matchUsingPathParts);
foreach (var potentialHashMatch in yieldedHashMatches)
{
if (!this.RestPathMap.TryGetValue(potentialHashMatch, out firstMatches))
{
continue;
}
var bestScore = -1;
foreach (var restPath in firstMatches)
{
var score = restPath.MatchScore(httpMethod, matchUsingPathParts, logger);
if (score > bestScore) bestScore = score;
}
if (bestScore > 0)
{
foreach (var restPath in firstMatches)
{
if (bestScore == restPath.MatchScore(httpMethod, matchUsingPathParts, logger))
return restPath;
}
}
}
var yieldedWildcardMatches = RestPath.GetFirstMatchWildCardHashKeys(matchUsingPathParts);
foreach (var potentialHashMatch in yieldedWildcardMatches)
{
if (!this.RestPathMap.TryGetValue(potentialHashMatch, out firstMatches)) continue;
var bestScore = -1;
foreach (var restPath in firstMatches)
{
var score = restPath.MatchScore(httpMethod, matchUsingPathParts, logger);
if (score > bestScore) bestScore = score;
}
if (bestScore > 0)
{
foreach (var restPath in firstMatches)
{
if (bestScore == restPath.MatchScore(httpMethod, matchUsingPathParts, logger))
return restPath;
}
}
}
return null;
}
public Task<object> Execute(HttpListenerHost appHost, object requestDto, IRequest req)
{
req.Dto = requestDto;
var requestType = requestDto.GetType();
req.OperationName = requestType.Name;
var serviceType = appHost.GetServiceTypeByRequest(requestType);
var service = appHost.CreateInstance(serviceType);
//var service = typeFactory.CreateInstance(serviceType);
var serviceRequiresContext = service as IRequiresRequest;
if (serviceRequiresContext != null)
{
serviceRequiresContext.Request = req;
}
if (req.Dto == null) // Don't override existing batched DTO[]
req.Dto = requestDto;
//Executes the service and returns the result
return ServiceExecGeneral.Execute(serviceType, req, service, requestDto, requestType.GetMethodName());
}
}
}
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