/// <summary>
/// 获取和更新Api行为的参数值
/// </summary>
/// <param name="context">上下文</param>
/// <exception cref="ArgumentException"></exception>
/// <returns></returns>
public static object[] GetAndUpdateParameterValues(ActionContext context)
{
var body = context.Packet.body as IList;
if (body == null)
{
throw new ArgumentException("body参数必须为数组");
}
if (body.Count != context.Action.ParameterTypes.Length)
{
throw new ArgumentException("body参数数量不正确");
}
var parameters = new object[body.Count];
var serializer = context.Session.Server.JsonSerializer;
for (var i = 0; i < body.Count; i++)
{
var bodyParameter = body[i];
var parameterType = context.Action.ParameterTypes[i];
parameters[i] = serializer.Convert(bodyParameter, parameterType);
}
context.Action.ParameterValues = parameters;
return parameters;
}
/// <summary>
/// 执行Api行为
/// </summary>
/// <param name="actionContext">上下文</param>
void IJsonWebSocketApiService.Execute(ActionContext actionContext)
{
var filters = Enumerable.Empty<IFilter>();
try
{
this.CurrentContext = actionContext;
filters = this.Server.FilterAttributeProvider.GetActionFilters(actionContext.Action);
this.ExecuteAction(actionContext, filters);
}
catch (AggregateException exception)
{
foreach (var inner in exception.InnerExceptions)
{
this.ProcessExecutingException(actionContext, filters, inner);
}
}
catch (Exception exception)
{
this.ProcessExecutingException(actionContext, filters, exception);
}
finally
{
this.CurrentContext = null;
}
}
protected override void OnExecuting(ActionContext filterContext)
{
if (filterContext.Session.Tag.TryGet("name") == null)
{
filterContext.Result = "请设置昵称后再聊天";
}
}
/// <summary>
/// 处理Api行为执行过程中产生的异常
/// </summary>
/// <param name="actionContext">上下文</param>
/// <param name="actionfilters">过滤器</param>
/// <param name="exception">异常项</param>
private void ProcessExecutingException(ActionContext actionContext, IEnumerable<IFilter> actionfilters, Exception exception)
{
var exceptionContext = new ExceptionContext(actionContext, new ApiExecuteException(exception));
this.Server.SendRemoteException(exceptionContext);
this.ExecAllExceptionFilters(actionfilters, exceptionContext);
}
/// <summary>
/// 在Api行为后执行过滤器
/// </summary>
/// <param name="filters">Api行为过滤器</param>
/// <param name="actionContext">上下文</param>
private void ExecFiltersAfterAction(IEnumerable<IFilter> filters, ActionContext actionContext)
{
var totalFilters = this.GetTotalFilters(filters);
foreach (var filter in totalFilters)
{
filter.OnExecuted(actionContext);
if (actionContext.Result != null) break;
}
}
/// <summary>
/// 调用自身实现的Api行为
/// 将返回值发送给客户端
/// </summary>
/// <param name="actionContext">上下文</param>
/// <param name="filters">过滤器</param>
/// <exception cref="ArgumentException"></exception>
/// <returns>当正常执行输出Api的结果时返回true</returns>
private bool ExecuteAction(ActionContext actionContext, IEnumerable<IFilter> filters)
{
var packet = actionContext.Packet;
var action = actionContext.Action;
var session = actionContext.Session;
var serializer = this.Server.JsonSerializer;
var parameters = this.GetAndUpdateParameterValues(actionContext);
// Api执行前
this.ExecFiltersBeforeAction(filters, actionContext);
if (actionContext.Result != null)
{
var exceptionContext = new ExceptionContext(actionContext, actionContext.Result);
this.Server.SendRemoteException(exceptionContext);
return false;
}
// 执行Api
var apiResult = action.Execute(this, parameters);
// Api执行后
this.ExecFiltersAfterAction(filters, actionContext);
if (actionContext.Result != null)
{
var exceptionContext = new ExceptionContext(actionContext, actionContext.Result);
this.Server.SendRemoteException(exceptionContext);
return false;
}
// 返回数据
if (action.IsVoidReturn == false && session.IsConnected)
{
packet.body = apiResult;
var packetJson = serializer.Serialize(packet);
session.UnWrap().SendText(packetJson);
}
return true;
}
/// <summary>
/// 异常上下文
/// </summary>
/// <param name="context">请求上下文</param>
/// <param name="exception">异常</param>
public ExceptionContext(ActionContext context, Exception exception)
: base(context.Session, context.Packet, context.AllSessions)
{
this.Exception = exception;
}
/// <summary>
/// 在执行Api行为后触发
/// </summary>
/// <param name="filterContext">上下文</param>
protected virtual void OnExecuted(ActionContext filterContext)
{
}
/// <summary>
/// 处理Api行为执行过程中产生的异常
/// </summary>
/// <param name="actionContext">上下文</param>
/// <param name="actionfilters">过滤器</param>
/// <param name="exception">异常项</param>
private void ProcessExecutingException(ActionContext actionContext, IEnumerable<IFilter> actionfilters, Exception exception)
{
var exceptionContext = new ExceptionContext(actionContext, new ApiExecuteException(exception));
Common.SetRemoteException(this.Server.JsonSerializer, exceptionContext);
this.ExecExceptionFilters(actionfilters, exceptionContext);
if (exceptionContext.ExceptionHandled == false)
{
throw exception;
}
}
/// <summary>
/// 在执行Api行为后触发
/// </summary>
/// <param name="filterContext">上下文</param>
protected virtual void OnExecuted(ActionContext filterContext)
{
}
