/// <summary>
/// 预处理调用
/// </summary>
/// <param name="request"></param>
/// <param name="context"></param>
/// <returns></returns>
private JsonRpcException PreProcess(JsonRpcRequestContext request, object context)
{
if (externalPreProcessingHandler == null)
{
return(null);
}
return(externalPreProcessingHandler(request, context));
}
/// <summary>
/// 完成后调用
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="context"></param>
internal void CompletedProcess(JsonRpcRequestContext request, JsonRpcResponseContext response, object context)
{
JsonRpcDataContext.RemoveContext();
if (externalCompletedProcessingHandler == null)
{
return;
}
externalCompletedProcessingHandler(request, response, context);
}
/// <summary>
/// 调用处理RpcRequest的方法
/// </summary>
/// <param name="requestContext">待处理的请求方法</param>
/// <param name="rpcContext">Rpc方法中获得的可选上下文</param>
/// <param name="callback">回调方法</param>
/// <returns></returns>
public JsonRpcResponseContext Handle(JsonRpcRequestContext requestContext, Object rpcContext = null, Action <JsonRpcResponseContext> callback = null)
{
//回调函数初始
if (callback == null)
{
callback = delegate(JsonRpcResponseContext item) { }
}
;
//添加到线程Id->上下文集合中
AddRpcContext(rpcContext);
//初始化当前线程数据上下文
//JsonRpcDataContext.GetOrInitCurrentContext();
//将请求上下文Tags赋值到线程上下文中
foreach (var key in requestContext.Tags.Keys)
{
JsonRpcDataContext.SetContextItem(key, requestContext.Tags[key]);
}
#region 预处理&出错则回调直接返回
var preProcessingException = PreProcess(requestContext, rpcContext);
if (preProcessingException != null)
{
var response = new JsonRpcResponseContext()
{
Error = preProcessingException,
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
#endregion
#region 获取和验证请求的委托与meta信息
//当前请求方法对应的meta信息
SMDService metaData = null;
//当前请求方法对应的反射委托
Delegate handle = null;
//根据请求方法，获取方法对应的委托
var haveDelegate = Handlers.TryGetValue(requestContext.Method, out handle);
//根据请求方法，获取方法对应的meta信息
var haveMetadata = MetaData.Services.TryGetValue(requestContext.Method, out metaData);
if (haveDelegate == false || haveMetadata == false || metaData == null || handle == null)
{
var response = new JsonRpcResponseContext()
{
Result = null,
Error = new JsonRpcException(-32601, "方法未找到", "此方法 " + requestContext.Method + " 不存在或未部署", requestContext),
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
}
#endregion
#region 参数获取与校验
bool isJObject = requestContext.Params is JObject;
bool isJArray = requestContext.Params is JArray;
//请求方法参数
object[] parameters = null;
//metaData是否包含异常
bool expectsRefException = false;
//metaData 参数数量
var metaDataParamCount = metaData.parameters.Count(p => p != null);
//获取当前请求上下问参数集合
var paramCollection = requestContext.Params as ICollection;
int paramCount = 0, loopCount = 0;
if (paramCollection != null)
{
paramCount = loopCount = paramCollection.Count;
}
//在请求参数与metaData参数相差一情况下，判断metaData最后参数是否为异常
if (paramCount == metaDataParamCount - 1 && metaData.parameters[metaDataParamCount - 1].ObjectType.Name.Contains(typeof(JsonRpcException).Name))
{
paramCount++;
expectsRefException = true;
}
//初始化请求参数集合大小
parameters = new object[paramCount];
//根据请求参数不同类型，填充参数集合
if (isJArray)
{
var jArray = requestContext.Params as JArray;
for (int i = 0; i < loopCount; i++)
{
parameters[i] = ConvetParameter(jArray[i], metaData.parameters[i]);
}
}
else if (isJObject)
{
var jObject = requestContext.Params as JObject;
var tokenDict = jObject as IDictionary <string, JToken>;
parameters = new object[metaData.parameters.Length];
//将请求参数与服务定义参数进行比较
for (int i = 0; i < metaData.parameters.Length; i++)
{
if (tokenDict.ContainsKey(metaData.parameters[i].Name) == false)
{
var response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext,
new JsonRpcException(-32602, "无效参数", string.Format("参数 '{0}' 未定义", metaData.parameters[i].Name), requestContext)),
Id = requestContext.Id
};
}
//获取请求参数
parameters[i] = ConvetParameter(jObject[metaData.parameters[i].Name], metaData.parameters[i]);
}
}
//请求参数小于metaData参数，可能包含可选参数
if (parameters.Length < metaDataParamCount && metaData.defaultValues.Length > 0)
{
//请求参数提供的数量
var suppliedParamsCount = parameters.Length;
//非Rpc设置的可选参数数量，缺失的参数数量
var missingParamsCount = metaDataParamCount - parameters.Length;
//调整可选参数数组大小，用于包含所有可选参数
Array.Resize(ref parameters, parameters.Length + missingParamsCount);
//将所有参数填充到parameters中
for (int paramIndex = parameters.Length - 1, defaultIndex = metaData.defaultValues.Length - 1;
paramIndex >= suppliedParamsCount && defaultIndex >= 0; paramIndex--, defaultIndex--)
{
parameters[paramIndex] = metaData.defaultValues[defaultIndex].Value;
}
if (missingParamsCount > metaData.defaultValues.Length)
{
var response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext,
new JsonRpcException(-32602, "无效参数", string.Format("缺省参数数量 {0} 不足以填充所缺失的参数数量 {1}",
metaData.defaultValues.Length, missingParamsCount), requestContext)),
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
}
if (parameters.Length != metaDataParamCount)
{
var response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext,
new JsonRpcException(-32602, "无效参数", string.Format("应接收 {0} 个参数,实际接收到 {1}",
metaData.parameters.Length, parameters.Length), requestContext)),
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
#endregion
#region 调用
try
{
//将回调存储到当前线程中，，便于从GetAsyncCallback中获得以进行回调
Thread.SetData(Thread.GetNamedDataSlot(THREAD_CALLBACK_SLOT_NAME), callback);
//调用请求方法对应委托并传入参数
var results = handle.DynamicInvoke(parameters);
//当前线程包含异常
if (Task.CurrentId.HasValue && rpcExceptions.TryRemove(Task.CurrentId.Value, out JsonRpcException contextException))
{
var response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, contextException), Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
var lastParam = parameters.LastOrDefault();
if (expectsRefException && lastParam != null && lastParam is JsonRpcException)
{
var response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, lastParam as JsonRpcException),
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
//返回结果
var reponse = new JsonRpcResponseContext()
{
Result = results
};
CompletedProcess(requestContext, reponse, requestContext);
return(reponse);
}
catch (Exception ex)
{
JsonRpcResponseContext response = null;
//系统委托调用异常(参数不匹配)
if (ex is TargetParameterCountException)
{
response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, new JsonRpcException(-32602, "参数不匹配", ex, rpcContext))
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
//业务异常
if (ex is JsonRpcException)
{
response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, new JsonRpcException(-32603, "内部错误", ex.InnerException, rpcContext)),
Id = requestContext.Id
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
//内部异常为业务异常
if (ex.InnerException != null && ex.InnerException is JsonRpcException)
{
response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, ex.InnerException as JsonRpcException)
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
//内部异常
else if (ex.InnerException != null)
{
response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, new JsonRpcException(-32603, "内部错误", ex.InnerException, rpcContext))
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
//其他异常，封装返回
else
{
response = new JsonRpcResponseContext()
{
Error = ProcessException(requestContext, new JsonRpcException(-32603, "内部错误", ex, rpcContext))
};
callback.Invoke(response);
CompletedProcess(requestContext, response, rpcContext);
return(response);
}
}
finally
{
RemoveRpcContext();
}
#endregion
}
