/// <summary>
/// 执行Action
/// </summary>
/// <param name="context">上下文</param>
/// <param name="arguments">参数值</param>
/// <returns></returns>
public async Task <TResult> InvokeAsync(ServiceContext context, object?[] arguments)
{
try
{
using var httpContext = new HttpContext(context);
var requestContext = new ApiRequestContext(httpContext, this.ApiAction, arguments);
return(await this.InvokeAsync(requestContext).ConfigureAwait(false));
}
catch (HttpRequestException)
{
throw;
}
catch (Exception ex)
{
throw new HttpRequestException(ex.Message, ex);
}
}
/// <summary>
/// 处理请求上下文
/// </summary>
/// <returns></returns>
private static async Task HandleRequestAsync(ApiRequestContext context)
{
// 参数验证
var validateProperty = context.HttpContext.HttpApiOptions.UseParameterPropertyValidate;
foreach (var parameter in context.ApiAction.Parameters)
{
var parameterValue = context.Arguments[parameter.Index];
DataValidator.ValidateParameter(parameter, parameterValue, validateProperty);
}
// action特性请求前执行
foreach (var attr in context.ApiAction.Attributes)
{
await attr.OnRequestAsync(context).ConfigureAwait(false);
}
// 参数特性请求前执行
foreach (var parameter in context.ApiAction.Parameters)
{
var ctx = new ApiParameterContext(context, parameter);
foreach (var attr in parameter.Attributes)
{
await attr.OnRequestAsync(ctx).ConfigureAwait(false);
}
}
// Return特性请求前执行
foreach (var @return in context.ApiAction.Return.Attributes)
{
await @return.OnRequestAsync(context).ConfigureAwait(false);
}
// GlobalFilter请求前执行
foreach (var filter in context.HttpContext.HttpApiOptions.GlobalFilters)
{
await filter.OnRequestAsync(context).ConfigureAwait(false);
}
// Filter请求前执行
foreach (var filter in context.ApiAction.FilterAttributes)
{
await filter.OnRequestAsync(context).ConfigureAwait(false);
}
}
/// <summary>
/// 发送http请求
/// </summary>
/// <param name="context"></param>
/// <exception cref="HttpRequestException"></exception>
/// <returns></returns>
public static async Task<ApiResponseContext> SendAsync(ApiRequestContext context)
{
var actionCache = await GetCaheAsync(context).ConfigureAwait(false);
if (actionCache != null && actionCache.Value != null)
{
context.HttpContext.ResponseMessage = actionCache.Value;
}
else
{
var client = context.HttpContext.Client;
using var tokenLinker = new CancellationTokenLinker(context.CancellationTokens);
var response = await client.SendAsync(context.HttpContext.RequestMessage, tokenLinker.Token).ConfigureAwait(false);
context.HttpContext.ResponseMessage = response;
await SetCacheAsync(context, actionCache?.Key, response).ConfigureAwait(false);
}
return new ApiResponseContext(context);
}
/// <summary>
/// 更新响应到缓存
/// </summary>
/// <param name="context"></param>
/// <param name="cacheKey">缓存键</param>
/// <param name="response">响应消息</param>
/// <returns></returns>
private static async Task SetCacheAsync(ApiRequestContext context, string? cacheKey, HttpResponseMessage? response)
{
var attribute = context.ApiAction.CacheAttribute;
if (attribute == null)
{
return;
}
if (response == null)
{
return;
}
if (attribute.GetWritePolicy(context) == CachePolicy.Ignore)
{
return;
}
if (string.IsNullOrEmpty(cacheKey) == true)
{
cacheKey = await attribute.GetCacheKeyAsync(context).ConfigureAwait(false);
}
if (cacheKey == null)
{
return;
}
var provider = context.HttpContext.Services.GetService<IResponseCacheProvider>();
if (provider == null)
{
return;
}
var cacheEntry = await ResponseCacheEntry.FromResponseMessageAsync(response).ConfigureAwait(false);
await provider.SetAsync(cacheKey, cacheEntry, attribute.Expiration).ConfigureAwait(false);
}
/// <summary>
/// Api参数上下文
/// </summary>
/// <param name="context">上下文</param>
/// <param name="parameterIndex">参数索引</param>
public ApiParameterContext(ApiRequestContext context, int parameterIndex)
: base(context.HttpContext, context.ApiAction, context.Arguments, context.Properties)
{
this.index = parameterIndex;
}
/// <summary>
/// 执行Api方法
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
private async Task <TResult> InvokeAsync(ApiRequestContext context)
{
#nullable disable
/// <summary>
/// 尝试根据参数名获取参数值
/// </summary>
/// <param name="context"></param>
/// <param name="parameterName">参数名</param>
/// <param name="value">值</param>
/// <returns></returns>
public static bool TryGetArgument(this ApiRequestContext context, string parameterName, out object?value)
{
return(context.TryGetArgument(parameterName, StringComparer.Ordinal, out value));
}
/// <summary>
/// 尝试根据参数名获取参数值
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <param name="context"></param>
/// <param name="parameterName">参数名</param>
/// <param name="value">值</param>
/// <returns></returns>
public static bool TryGetArgument <TValue>(this ApiRequestContext context, string parameterName, [MaybeNullWhen(false)] out TValue value)
{
return(context.TryGetArgument(parameterName, StringComparer.Ordinal, out value));
}
/// <summary>
/// Api参数上下文
/// </summary>
/// <param name="context">上下文</param>
/// <param name="parameter">参数描述</param>
public ApiParameterContext(ApiRequestContext context, ApiParameterDescriptor parameter)
: base(context.HttpContext, context.ApiAction, context.Arguments, context.Properties)
{
this.Parameter = parameter;
}
/// <summary>
/// Api参数上下文
/// </summary>
/// <param name="context">上下文</param>
/// <param name="parameterIndex">参数索引</param>
public ApiParameterContext(ApiRequestContext context, int parameterIndex)
: this(context, context.ApiAction.Parameters[parameterIndex])
{
}
/// <summary>
/// 执行上下文
/// </summary>
/// <param name="request">请求上下文</param>
/// <returns></returns>
public static Task <ApiResponseContext> InvokeAsync(ApiRequestContext request)
{
return(handler(request));
}
/// <summary>
/// Api参数上下文
/// </summary>
/// <param name="context">上下文</param>
/// <param name="parameterIndex">参数索引</param>
public ApiParameterContext(ApiRequestContext context, int parameterIndex)
: base(context.HttpContext, context.ApiAction, context.Arguments, context.UserDatas, context.CancellationTokens)
{
this.index = parameterIndex;
}
/// <summary>
/// Api缓存
/// </summary>
/// <param name="context">上下文</param>
public ApiCache(ApiRequestContext context)
{
this.context = context;
this.attribute = context.ApiAction.CacheAttribute;
}
