private List <Endpoint> BuildEndpoints()
{
List <Endpoint> endpoints = new List <Endpoint>();
foreach (var hubMethod in HubMethods)
{
var requiredValues = new { hub = hubMethod.Hub, method = hubMethod.Method };
var order = 1;
foreach (var pattern in Patterns)
{
var resolvedPattern = _routePatternTransformer.SubstituteRequiredValues(pattern, requiredValues);
if (resolvedPattern == null)
{
continue;
}
var endpointModel = new RouteEndpointModel(
hubMethod.RequestDelegate,
resolvedPattern,
order++);
endpointModel.DisplayName = $"{hubMethod.Hub}.{hubMethod.Method}";
foreach (var convention in _conventions)
{
convention(endpointModel);
}
endpoints.Add(endpointModel.Build());
}
}
return(endpoints);
}
private RouteEndpoint CreateEndpoint(
ActionDescriptor action,
IDictionary <string, string> actionRouteValues,
string routeName,
string patternRawText,
IEnumerable <RoutePatternPathSegment> segments,
object nonInlineDefaults,
int order,
RouteValueDictionary dataTokens,
bool suppressLinkGeneration,
bool suppressPathMatching,
List <Action <EndpointModel> > conventions)
{
RequestDelegate requestDelegate = (context) =>
{
var routeData = context.GetRouteData();
var actionContext = new ActionContext(context, routeData, action);
var invoker = _invokerFactory.CreateInvoker(actionContext);
return(invoker.InvokeAsync());
};
var defaults = new RouteValueDictionary(nonInlineDefaults);
EnsureRequiredValuesInDefaults(actionRouteValues, defaults, segments);
var model = new RouteEndpointModel(requestDelegate, RoutePatternFactory.Pattern(patternRawText, defaults, parameterPolicies: null, segments), order);
AddEndpointMetadata(
model.Metadata,
action,
routeName,
new RouteValueDictionary(actionRouteValues),
dataTokens,
suppressLinkGeneration,
suppressPathMatching);
model.DisplayName = action.DisplayName;
// REVIEW: When should conventions be run
// Metadata should have lower precedence that data source metadata
if (conventions != null)
{
foreach (var convention in conventions)
{
convention(model);
}
}
return((RouteEndpoint)model.Build());
}
private RouteEndpoint CreateEndpoint(
ActionDescriptor action,
RoutePattern routePattern,
string routeName,
int order,
RouteValueDictionary dataTokens,
bool suppressLinkGeneration,
bool suppressPathMatching,
List <Action <EndpointModel> > conventions)
{
RequestDelegate requestDelegate = (context) =>
{
var routeData = context.GetRouteData();
var actionContext = new ActionContext(context, routeData, action);
var invoker = _invokerFactory.CreateInvoker(actionContext);
return(invoker.InvokeAsync());
};
var model = new RouteEndpointModel(requestDelegate, routePattern, order);
AddEndpointMetadata(
model.Metadata,
action,
routeName,
dataTokens,
suppressLinkGeneration,
suppressPathMatching);
model.DisplayName = action.DisplayName;
// REVIEW: When should conventions be run
// Metadata should have lower precedence that data source metadata
if (conventions != null)
{
foreach (var convention in conventions)
{
convention(model);
}
}
return((RouteEndpoint)model.Build());
}
private static List <Endpoint> BuildWithoutCache(Type handlerType, Action <HttpModel> configure)
{
var model = HttpModel.FromType(handlerType);
configure?.Invoke(model);
var endpoints = new List <Endpoint>();
foreach (var method in model.Methods.Where(m => m.RoutePattern != null))
{
var needForm = false;
var httpMethod = method.HttpMethod;
var template = method.RoutePattern;
// Non void return type
// Task Invoke(HttpContext httpContext, RouteValueDictionary routeValues, RequestDelegate next)
// {
// // The type is activated via DI if it has args
// return ExecuteResult(new THttpHandler(...).Method(..), httpContext);
// }
// void return type
// Task Invoke(HttpContext httpContext, RouteValueDictionary routeValues, RequestDelegate next)
// {
// new THttpHandler(...).Method(..)
// return Task.CompletedTask;
// }
var httpContextArg = Expression.Parameter(typeof(HttpContext), "httpContext");
var routeValuesArg = Expression.Parameter(typeof(RouteValueDictionary), "routeValues");
var nextArg = Expression.Parameter(typeof(RequestDelegate), "next");
var requestServicesExpr = Expression.Property(httpContextArg, nameof(HttpContext.RequestServices));
// Fast path: We can skip the activator if there's only a default ctor with 0 args
var ctors = handlerType.GetConstructors();
Expression httpHandlerExpression = null;
if (method.MethodInfo.IsStatic)
{
// Do nothing
}
else if (ctors.Length == 1 && ctors[0].GetParameters().Length == 0)
{
httpHandlerExpression = Expression.New(ctors[0]);
}
else
{
// CreateInstance<THttpHandler>(context.RequestServices)
httpHandlerExpression = Expression.Call(ActivatorMethodInfo.MakeGenericMethod(handlerType), requestServicesExpr);
}
var args = new List <Expression>();
var httpRequestExpr = Expression.Property(httpContextArg, nameof(HttpContext.Request));
foreach (var parameter in method.Parameters)
{
Expression paramterExpression = Expression.Default(parameter.ParameterType);
if (parameter.FromQuery != null)
{
var queryProperty = Expression.Property(httpRequestExpr, nameof(HttpRequest.Query));
paramterExpression = BindArgument(queryProperty, parameter, parameter.FromQuery);
}
else if (parameter.FromHeader != null)
{
var headersProperty = Expression.Property(httpRequestExpr, nameof(HttpRequest.Headers));
paramterExpression = BindArgument(headersProperty, parameter, parameter.FromHeader);
}
else if (parameter.FromRoute != null)
{
paramterExpression = BindArgument(routeValuesArg, parameter, parameter.FromRoute);
}
else if (parameter.FromCookie != null)
{
var cookiesProperty = Expression.Property(httpRequestExpr, nameof(HttpRequest.Cookies));
paramterExpression = BindArgument(cookiesProperty, parameter, parameter.FromCookie);
}
else if (parameter.FromServices)
{
paramterExpression = Expression.Call(GetRequiredServiceMethodInfo.MakeGenericMethod(parameter.ParameterType), requestServicesExpr);
}
else if (parameter.FromForm != null)
{
needForm = true;
var formProperty = Expression.Property(httpRequestExpr, nameof(HttpRequest.Form));
paramterExpression = BindArgument(formProperty, parameter, parameter.FromForm);
}
else if (parameter.FromBody)
{
var bodyProperty = Expression.Property(httpRequestExpr, nameof(HttpRequest.Body));
paramterExpression = BindBody(bodyProperty, parameter);
}
else
{
if (parameter.ParameterType == typeof(IFormCollection))
{
paramterExpression = Expression.Property(httpRequestExpr, nameof(HttpRequest.Form));
}
else if (parameter.ParameterType == typeof(HttpContext))
{
paramterExpression = httpContextArg;
}
else if (parameter.ParameterType == typeof(RequestDelegate))
{
paramterExpression = nextArg;
}
else if (parameter.ParameterType == typeof(IHeaderDictionary))
{
paramterExpression = Expression.Property(httpRequestExpr, nameof(HttpRequest.Headers));
}
}
args.Add(paramterExpression);
}
Expression body = null;
if (method.ReturnType == typeof(void))
{
var bodyExpressions = new List <Expression>
{
Expression.Call(httpHandlerExpression, method.MethodInfo, args),
Expression.Property(null, (PropertyInfo)CompletedTaskMemberInfo)
};
body = Expression.Block(bodyExpressions);
}
else
{
var methodCall = Expression.Call(httpHandlerExpression, method.MethodInfo, args);
// Coerce Task<T> to Task<object>
if (method.ReturnType.IsGenericType &&
method.ReturnType.GetGenericTypeDefinition() == typeof(Task <>))
{
var typeArg = method.ReturnType.GetGenericArguments()[0];
// ExecuteTask<T>(handler.Method(..), httpContext);
body = Expression.Call(
ExecuteTaskOfTMethodInfo.MakeGenericMethod(typeArg),
methodCall,
httpContextArg);
}
else
{
// ExecuteResult(handler.Method(..), httpContext);
body = Expression.Call(ExecuteAsyncMethodInfo, methodCall, httpContextArg);
}
}
var lambda = Expression.Lambda <Func <HttpContext, RouteValueDictionary, RequestDelegate, Task> >(body, httpContextArg, routeValuesArg, nextArg);
var routeTemplate = method.RoutePattern;
var invoker = lambda.Compile();
var routeEndpointModel = new RouteEndpointModel(
async httpContext =>
{
// Generating async code would just be insane so if the method needs the form populate it here
// so the within the method it's cached
if (needForm)
{
await httpContext.Request.ReadFormAsync();
}
await invoker.Invoke(httpContext, httpContext.Request.RouteValues, (c) => Task.CompletedTask);
},
routeTemplate,
0);
routeEndpointModel.DisplayName = routeTemplate.RawText;
if (!string.IsNullOrEmpty(method.HttpMethod))
{
routeEndpointModel.Metadata.Add(new HttpMethodMetadata(new[] { method.HttpMethod }));
}
foreach (var attribute in method.MethodInfo.GetCustomAttributes(true))
{
routeEndpointModel.Metadata.Add(attribute);
}
foreach (var convention in method.Conventions)
{
convention(routeEndpointModel);
}
endpoints.Add(routeEndpointModel.Build());
}
return(endpoints);
}