internal ServiceRequestEventArgs(ServiceRequest request, ServiceResponse response)
{
this.Request = request;
this.Response = response;
}
/// <summary>
/// Generates a script tag to embed a model including instance data into a server-rendered view.
/// Supports initial customization of the model via an initialization delegate.
/// </summary>
/// <param name="query"></param>
/// <param name="init"></param>
/// <returns></returns>
static void Model(TextWriter writer, object query, Delegate init)
{
// Raise the begin model event
if (BeginModel != null)
{
BeginModel(query, EventArgs.Empty);
}
// Get the roots for each query
var roots = new List <KeyValuePair <string, ServiceRequest.Query> >();
foreach (var prop in query.GetType().GetProperties())
{
// Get the value of the model property
var m = prop.GetValue(query, null);
if (m == null)
{
continue;
}
// Convert the value into a query, if necessary
var q = m as ServiceRequest.Query ?? Query(m);
if (q != null)
{
q.LoadRoots(null);
roots.Add(new KeyValuePair <string, ServiceRequest.Query>(prop.Name, q));
}
}
// Create the request object
ServiceRequest request = new ServiceRequest(roots.Select(r => r.Value).ToArray());
// Synthesize init new changes for new query roots
ModelTransaction initChanges = (ModelTransaction)request.Queries
.SelectMany(q => q.Roots)
.Where(i => i.IsNew)
.Select(i => new ModelInitEvent.InitNew(i))
.Cast <ModelEvent>()
.ToList();
// Perform the initialization action, if specified
if (init != null)
{
// Determine matching parameters
var parameters = new object[init.Method.GetParameters().Length];
foreach (var p in init.Method.GetParameters())
{
foreach (var root in roots)
{
if (p.Name.Equals(root.Key, StringComparison.InvariantCultureIgnoreCase))
{
// List parameter
if (p.ParameterType.IsArray)
{
parameters[p.Position] = root.Value.Roots.Select(r => r.Instance).ToArray();
}
// Instance parameter
else
{
parameters[p.Position] = root.Value.Roots.Select(r => r.Instance).FirstOrDefault();
}
break;
}
}
// Throw an exception if the model property value cannot be cast to the corresponding initialization parameter
if (parameters[p.Position] != null && !p.ParameterType.IsAssignableFrom(parameters[p.Position].GetType()))
{
throw new ArgumentException(String.Format("The model property '{0}' cannot be converted into the initialization parameter type of '{1}'.", p.Name, p.ParameterType.FullName));
}
// Throw an exception if a valid model parameter could not be found to pass to the initialization delegate
if (parameters[p.Position] == null && query.GetType().GetProperty(p.Name, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance) == null)
{
throw new ArgumentException(String.Format("A model property could not be found to pass to the initialization parameter '{0}'.", p.Name));
}
}
// Perform initialization while capturing changes
initChanges.Record(() =>
{
// Prevent property change rules from running until after initialization
ModelEventScope.Perform(() => init.DynamicInvoke(parameters));
});
}
// Invoke the request queries
ServiceResponse response = request.Invoke(initChanges);
response.Model = roots.ToDictionary(r => r.Key, r => r.Value);
foreach (var q in response.Model.Values)
{
q.ReducePaths();
}
// Track the current model roots to support server template rendering
foreach (var root in response.Model)
{
Templates.Page.Current.Model[root.Key] = root.Value.IsList ? (object)root.Value.Roots : (root.Value.Roots.Length == 1 ?root.Value.Roots[0] : null);
}
// Write the model embed script to the writer
writer.Write("<script type=\"text/javascript\">$exoweb(");
JsonUtility.Serialize(writer, response);
writer.Write(");</script>");
// Raise the end model event
if (EndModel != null)
{
EndModel(query, EventArgs.Empty);
}
}
internal ServiceRequestEventArgs(ServiceRequest request, ServiceResponse response)
{
this.Request = request;
this.Response = response;
}
/// <summary>
/// Processes incoming requests and routes them to the appropriate JSON handler method.
/// </summary>
/// <param name="context"></param>
void IHttpHandler.ProcessRequest(HttpContext context)
{
IsExecuting = true;
try
{
// Perform the requested operation
switch (context.Request.PathInfo)
{
case "/GetType":
// Enable response caching
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
context.Response.Cache.SetMaxAge(TimeSpan.FromDays(7));
// Output the type metadata
context.Response.ContentType = "application/json";
JsonUtility.Serialize(context.Response.OutputStream, new ServiceRequest(context.Request.QueryString["type"].Replace("\"", "")).Invoke(null));
break;
case "/LogError":
// Raise the error event
context.Response.ContentType = "application/json";
ExoWeb.OnError(JsonUtility.Deserialize <ServiceError>(context.Request.InputStream));
break;
default:
// Deserialize the request
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
context.Response.Cache.SetNoStore();
ServiceRequest request = JsonUtility.Deserialize <ServiceRequest>(context.Request.InputStream);
// Invoke the request and output the response
context.Response.ContentType = "application/json";
using (var test = new StringWriter())
{
JsonUtility.Serialize(test, request.Invoke(null));
context.Response.Write(test.ToString());
}
break;
}
}
catch (Exception e)
{
// look for an ExoModel.ModelException that may display a more
// abstracted or informative message in the UI. Otherwise, use
// the inner most exception
Exception reported = e;
for (Exception x = e; x != null; x = x.InnerException)
{
reported = x;
if (x is ModelException)
{
break;
}
}
// Create an error to log
var error = new ServiceError();
error.Type = reported.GetType().FullName;
error.StackTrace = GetFullStackTrace(e);
error.Message = reported.Message;
error.Url = context.Request.RawUrl;
if (error.AdditionalInfo == null)
{
error.AdditionalInfo = new Dictionary <string, object>();
}
//error.AdditionalInfo.Add("Client.RequestJson", json);
// Raise the error event
ExoWeb.OnError(error);
// Also send the error information to the client
context.Response.Clear();
context.Response.ContentType = "application/json";
context.Response.StatusCode = 500; // internal server error
// Enable error information on client
if (ExoWeb.EnableExceptionInformation)
{
context.Response.AddHeader("jsonerror", "true");
// Ensure IIS 7 doesn't intercept the error
context.Response.TrySkipIisCustomErrors = true;
}
context.Response.Write(ExoWeb.ToJson(error));
}
}
