using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using NewLife;
using NewLife.Log;
using NewLife.Web;
using HttpContext = Microsoft.AspNetCore.Http.HttpContext;
namespace Stardust.Extensions;
/// <summary>性能跟踪中间件</summary>
public class TracerMiddleware
{
private readonly RequestDelegate _next;
/// <summary>跟踪器</summary>
public static ITracer? Tracer { get; set; }
/// <summary>实例化</summary>
/// <param name="next"></param>
public TracerMiddleware(RequestDelegate next) => _next = next ?? throw new ArgumentNullException(nameof(next));
/// <summary>调用</summary>
/// <param name="ctx"></param>
/// <returns></returns>
public async Task Invoke(HttpContext ctx)
{
//!! 以下代码不能封装为独立方法，因为有异步存在，代码被拆分为状态机，导致这里建立的埋点span无法关联页面接口内的下级埋点
ISpan? span = null;
if (Tracer != null && !ctx.WebSockets.IsWebSocketRequest)
{
var action = GetAction(ctx);
if (!action.IsNullOrEmpty())
{
// 请求主体作为强制采样的数据标签，便于分析链路
var req = ctx.Request;
span = Tracer.NewSpan(action);
span.Tag = $"{ctx.GetUserHost()} {req.Method} {req.GetRawUrl()}";
span.Detach(req.Headers);
span.Value = req.ContentLength ?? 0;
if (span is DefaultSpan ds && ds.TraceFlag > 0)
{
var flag = false;
if (req.ContentLength != null &&
req.ContentLength < 1024 * 8 &&
req.ContentType != null &&
req.ContentType.StartsWithIgnoreCase(TagTypes))
{
req.EnableBuffering();
var buf = new Byte[1024];
var count = await req.Body.ReadAsync(buf, 0, buf.Length);
span.AppendTag("\r\n<=\r\n" + buf.ToStr(null, 0, count));
req.Body.Position = 0;
flag = true;
}
if (span.Tag.Length < 500)
{
if (!flag) span.AppendTag("\r\n<=");
var vs = req.Headers.Where(e => !e.Key.EqualIgnoreCase(ExcludeHeaders)).ToDictionary(e => e.Key, e => e.Value + "");
span.AppendTag("\r\n" + vs.Join(Environment.NewLine, e => $"{e.Key}:{e.Value}"));
}
else if (!flag)
{
span.AppendTag("\r\n<=\r\n");
span.AppendTag($"ContentLength: {req.ContentLength}\r\n");
span.AppendTag($"ContentType: {req.ContentType}");
}
}
}
}
try
{
await _next.Invoke(ctx);
// 自动记录用户访问主机地址
SaveServiceAddress(ctx);
// 根据状态码识别异常
if (span != null)
{
var res = ctx.Response;
span.Value += res.ContentLength ?? 0;
var code = res.StatusCode;
if (code == 400 || code > 404)
span.SetError(new HttpRequestException($"Http Error {code} {(HttpStatusCode)code}"), null);
else if (code == 200)
{
if (span is DefaultSpan ds && ds.TraceFlag > 0 && (span.Tag == null || span.Tag.Length < 500))
{
var flag = false;
if (res.ContentLength != null &&
res.ContentLength < 1024 * 8 &&
res.Body.CanSeek &&
res.ContentType != null &&
res.ContentType.StartsWithIgnoreCase(TagTypes))
{
var buf = new Byte[1024];
var p = res.Body.Position;
var count = await res.Body.ReadAsync(buf, 0, buf.Length);
span.AppendTag("\r\n=>\r\n" + buf.ToStr(null, 0, count));
res.Body.Position = p;
flag = true;
}
if (span.Tag == null || span.Tag.Length < 500)
{
if (!flag) span.AppendTag("\r\n=>");
var vs = res.Headers.Where(e => !e.Key.EqualIgnoreCase(ExcludeHeaders)).ToDictionary(e => e.Key, e => e.Value + "");
span.AppendTag("\r\n" + vs.Join(Environment.NewLine, e => $"{e.Key}:{e.Value}"));
}
else if (!flag)
{
span.AppendTag("\r\n=>\r\n");
span.AppendTag($"ContentLength: {res.ContentLength}\r\n");
span.AppendTag($"ContentType: {res.ContentType}");
}
}
}
}
}
catch (Exception ex)
{
//if (span != null)
//{
// // 接口抛出ApiException时，认为是正常业务行为，埋点不算异常
// if (ex is ApiException)
// span.Tag ??= ex.Message;
// else
// span.SetError(ex, null);
//}
// 捕获所有未处理异常，即使是ApiException，也应该在接口层包装而不是继续向外抛出异常
span?.SetError(ex, null);
throw;
}
finally
{
span?.Dispose();
}
}
/// <summary>支持作为标签数据的内容类型</summary>
public static String[] TagTypes { get; set; } = [
"text/plain", "text/xml", "application/json", "application/xml", "application/x-www-form-urlencoded"
];
/// <summary>忽略的头部</summary>
public static String[] ExcludeHeaders { get; set; } = ["traceparent", "Authorization", "Cookie"];
/// <summary>忽略的后缀</summary>
public static String[] ExcludeSuffixes { get; set; } = [
".html", ".htm", ".js", ".css", ".map", ".png", ".jpg", ".gif", ".ico", // 脚本样式图片
".woff", ".woff2", ".svg", ".ttf", ".otf", ".eot" // 字体
];
private static readonly String[] CubeActions = ["index", "detail", "add", "edit", "delete", "deleteSelect", "deleteAll", "ExportCsv", "Info", "SetEnable", "EnableSelect", "DisableSelect", "DeleteSelect"];
private static String? GetAction(HttpContext ctx)
{
var p = ctx.Request.Path + "";
if (p.EndsWithIgnoreCase(ExcludeSuffixes)) return null;
var ss = p.Split('/', StringSplitOptions.RemoveEmptyEntries);
if (ss.Length == 0) return p;
// 如果是魔方格式，保留3段，其它webapi接口只留2段
if (ss.Length >= 3 && ss[2].EqualIgnoreCase(CubeActions))
p = "/" + ss.Take(3).Join("/");
else
p = "/" + ss.Take(2).Join("/");
return p;
}
/// <summary>自动记录用户访问主机地址</summary>
/// <param name="ctx"></param>
public static void SaveServiceAddress(HttpContext ctx)
{
var uri = ctx.Request.GetRawUrl();
if (uri == null) return;
var baseAddress = $"{uri.Scheme}://{uri.Authority}";
var set = NewLife.Setting.Current;
var ss = set.ServiceAddress.Split(",").ToList();
if (!ss.Contains(baseAddress))
{
ss.Insert(0, baseAddress);
set.ServiceAddress = ss.Take(3).Join(",");
set.Save();
}
}
}
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