/// <summary>
/// 执行，按实际结果返回
/// </summary>
/// <param name="letter">客户端递交的参数信息</param>
/// <returns></returns>
public static object Exec(Letter letter)
{
//1.创建对象,即$api.get("account/single")中的account
object execObj = ExecuteMethod.CreateInstance(letter);
//2.获取要执行的方法，即$api.get("account/single")中的single
MethodInfo method = getMethod(execObj.GetType(), letter);
//3#.验证方法的特性,一是验证Http动词，二是验证是否登录后操作，三是验证权限
//----验证Http谓词访问限制
HttpAttribute.Verify(letter.HTTP_METHOD, method);
//LoginAttribute.Verify(method);
//----范围控制，本机或局域网，或同域
bool isRange = RangeAttribute.Verify(letter, method);
//----验证是否需要登录
LoginAttribute loginattr = LoginAttribute.Verify(method);
//4.构建执行该方法所需要的参数
object[] parameters = getInvokeParam(method, letter);
//5.执行方法，返回结果
object objResult = null; //结果
//只有get方式时，才使用缓存
CacheAttribute cache = null;
if (letter.HTTP_METHOD == "GET")
{
cache = CacheAttribute.GetAttr <CacheAttribute>(method);
}
if (cache != null)
{
objResult = CacheAttribute.GetResult(method, letter);
if (objResult == null)
{
objResult = method.Invoke(execObj, parameters);
CacheAttribute.Insert(cache.Expires, method, letter, objResult);
}
}
else
{
objResult = method.Invoke(execObj, parameters);
}
//将执行结果写入日志
LoginAttribute.LogWrite(loginattr, objResult);
return(objResult);
}
private LambdaExpression GetExpressionForBodyRequest(HttpAttribute httpAttribute, Type returnType, ParameterInfo[] parameters)
{
var parameterExpressions = parameters
.Select(p => (Expression.Parameter(p.ParameterType, p.Name), p))
.ToArray();
var bodyParameter = GetBodyParameter(parameters);
var bodyParameterExpression = bodyParameter == null
? (Expression)Expression.Constant(null)
: parameterExpressions
.Select(pe => pe.Item1)
.First(pe => pe.Name == bodyParameter.Name && pe.Type == bodyParameter.ParameterType);
return(GetExpressionForRequest(
httpAttribute,
returnType,
parameters,
parameterExpressions,
bodyParameterExpression));
}
private static void ValidateServiceMethodParameters(ParameterInfo[] parameters, HttpAttribute httpAttribute)
{
if (parameters.Any(p => p.GetCustomAttribute <BodyAttribute>() != null && (httpAttribute is GetAttribute || httpAttribute is DeleteAttribute)))
{
throw new ServiceInitializeException("GET or DELETE http request cannot has body");
}
}
private LambdaExpression GetExpressionForRequest(
HttpAttribute httpAttribute,
Type returnType,
ParameterInfo[] parameters,
(ParameterExpression, ParameterInfo)[] parameterExpressions,