MongoDB学习笔记~监控Http请求的消息链

在微服务架构里，你的一个任务可以需要经过多次中转，去多个接口获取数据，而在这个过程中，出现问题后的解决就成了一个大难点，你无法定位它的问题，这时，大叔的分布式消息树就出现了，费话不多说，主要看一下实现的逻辑。

大叔对分布式消息链的一些想法

事情是这样的，前段时间在做接口开发时，可能出现这种情况，一个接口返回的数据，可能来自多个接口，这就出现了一些链条式的调用，这在面向服务SOA开发和微服务开发中经常会遇到，因为你的VO数据来源，可能真的不是一个接口能满足的，这就需要有一个HTTP的链条，而如何对这些请求进行跟踪，就是大叔的消息链要做的事了！

页面VO

=>

接口A请求

=>

接口B请求

=>

接口C接口

=>

接口C返回

=>

接口B返回

=>

接口A返回

=>

请求结束！

大叔的设计图

在消息传递过程中，使用这个消息上下文

    /// <summary>
    /// 消息上下文
    /// </summary>
    public class LoggerContext
    {
        /// <summary>
        /// 消息根ID(完整请求）
        /// </summary>
        [BsonId]
        [BsonRepresentation(BsonType.ObjectId)]
        public string Id { get; set; }
        public string RootId { get; set; }
        /// <summary>
        /// 上级消息ID（前一个请求）
        /// </summary>
        public string ParentId { get; set; }
        /// <summary>
        /// 当前消息ID（当前请求）
        /// </summary>
        public string ChildId { get; set; }
        /// <summary>
        /// 消息体
        /// </summary>
        public string MessageBody { get; set; }
        /// <summary>
        /// 当前url
        /// </summary>
        public string Url { get; set; }
        /// <summary>
        /// 时间
        /// </summary>
        public DateTime AddTime { get; set; }
    }

大叔对消息处理程序的封装

    /// <summary>
    /// 分布式消息树实现
    /// </summary>
    public class LoggerContextImpl
    {
        static ILogger logger = new EmptyLogger();
        #region Fields & Consts
        const string Format_Msg_Before = "请求之前，地址：{0},方式：{1},时间：{2}";
        const string Format_Msg = "响应之后，地址：{0},状态码：{1},时间：{2}";
        /// <summary>
        /// HttpContext上存储的日志上下文
        /// </summary>
        const string LOGGERCONTEXT = "LoggerContext";
        #endregion

        #region Private Methods
        /// <summary>
        /// 从请求头中拿到当前的消息树对象
        /// client发布端：SetContextToServer
        /// server接收端：GetContextFromServer
        /// </summary>
        /// <returns></returns>
        static LoggerContext GetContextFromServer()
        {
            try
            {
                var result = System.Web.HttpContext.Current.Request.Headers.GetValues(LOGGERCONTEXT);
                if (result != null && result.Length > )
                {
                    var cat = JsonConvert.DeserializeObject<LoggerContext>(result[].ToString());
                    return cat;
                }
                return null;
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
                return null;
            }

        }
        static LoggerContext GetContextFromServer(HttpClient http)
        {
            try
            {
                IList<string> result = http.DefaultRequestHeaders.GetValues(LOGGERCONTEXT) as IList<string>;
                if (result != null && result.Count > )
                {
                    var cat = JsonConvert.DeserializeObject<LoggerContext>(result[].ToString());
                    return cat;
                }
                return null;
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
                return null;
            }

        }
        /// <summary>
        /// 设置消息树到当前请求头
        /// </summary>
        /// <returns></returns>
        internal static void SetContextToRequestHeader(System.Web.HttpContext http, LoggerContext context)
        {
            try
            {
                if (http.Request.Headers.GetValues(LOGGERCONTEXT) != null && http.Request.Headers.GetValues(LOGGERCONTEXT).Length > )
                {
                    http.Request.Headers.Remove(LOGGERCONTEXT);
                }
                http.Request.Headers.Add(LOGGERCONTEXT, JsonConvert.SerializeObject(context));
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
            }

        }
        /// <summary>
        /// 设置消息树到当前请求头
        /// </summary>
        /// <param name="http"></param>
        /// <param name="context"></param>
        internal static void SetContextToRequestHeader(HttpClient http, LoggerContext context)
        {
            try
            {
                http.DefaultRequestHeaders.Remove(LOGGERCONTEXT);
                http.DefaultRequestHeaders.Add(LOGGERCONTEXT, JsonConvert.SerializeObject(context));
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
            }
        }
        /// <summary>
        /// 设置消息树到当前请求头
        /// </summary>
        /// <param name="http"></param>
        /// <param name="context"></param>
        internal static void SetContextToRequestHeader(System.Web.HttpContextBase http, LoggerContext context)
        {
            try
            {
                if (http.Request.Headers.GetValues(LOGGERCONTEXT) != null && http.Request.Headers.GetValues(LOGGERCONTEXT).Length > )
                {
                    http.Request.Headers.Remove(LOGGERCONTEXT);
                }

                http.Request.Headers.Add(LOGGERCONTEXT, JsonConvert.SerializeObject(context));
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
            }

        }
        /// <summary>
        /// 设置请求头，它来自某个响应头
        /// </summary>
        /// <param name="response"></param>
        internal static void SetContextToRequestHeader(HttpResponseMessage response, string currentUrl = null)
        {
            try
            {
                IEnumerable<string> context = new List<string>();
                if (response.Headers.TryGetValues(LOGGERCONTEXT, out context) || response.RequestMessage.Headers.TryGetValues(LOGGERCONTEXT, out context))
                {
                    if (context != null)
                    {
                        var cat = JsonConvert.DeserializeObject<LoggerContext>((context as string[])[].ToString());
                        SetContextToRequestHeader(System.Web.HttpContext.Current, cat);
                        GetCurrentContext("响应结束", currentUrl);
                    }
                }
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
            }

        }
        /// <summary>
        /// 设置LoggerContext到响应头
        /// </summary>
        /// <param name="response"></param>
        /// <param name="context"></param>
        internal static void SetContextToResponseHeader(HttpResponseBase response, LoggerContext context)
        {
            try
            {
                if (response.Headers.GetValues(LOGGERCONTEXT) != null
                               && response.Headers.GetValues(LOGGERCONTEXT).Length > )
                {
                    response.Headers.Remove(LOGGERCONTEXT);
                }
                response.Headers.Add(LOGGERCONTEXT, JsonConvert.SerializeObject(context));
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
            }

        }
        /// <summary>
        /// 生产一个ROOTID
        /// </summary>
        /// <returns></returns>
        static string GenerateRootID()
        {
            return DateTime.Now.ToString("yyyyMMddHHmmssfff") + Thread.CurrentThread.ManagedThreadId;
        }
        /// <summary>
        /// 递归树
        /// </summary>
        /// <param name="str"></param>
        /// <param name="id"></param>
        /// <param name="timer"></param>
        static void MsgTree(StringBuilder str, string id, List<DateTime> timer)
        {
            var list = NoSql.MongodbManager<LoggerContext>.Instance.Find(i => i.ParentId == id).ToList();
            if (list != null)
            {
                str.Append("<ul class='treeMsg'>");
                foreach (var item in list)
                {
                    timer.Add(item.AddTime);
                    str.AppendFormat("<li><span style='color:red'>{0}</span><span style='color:green'>{1}</span><span>{2}</span></li>"
                     , item.Url
                     , item.MessageBody
                     , item.AddTime);
                    MsgTree(str, item.ChildId, timer);
                }
                str.Append("</ul>");

            }

        }
        #endregion

        #region 分布式消息树的封装（仓储大叔）
        /// <summary>
        ///  建立一个上下文对象
        /// </summary>
        /// <param name="rootId">根ID</param>
        /// <param name="parentId">上一请求ID</param>
        /// <param name="url"></param>
        /// <returns></returns>
        public static LoggerContext DoTransaction(string rootId, string parentId, string url)
        {
            if (GlobalConfig.ConfigManager.Config.Logger.IsHttpClientLog != )
                return new LoggerContext();

            //建立一个日志，返回rootid,parentid(第一个应该是空),currentid,其中currentid将做为下一次请求的parentid
            var filter = Builders<LoggerContext>.Filter.Eq(i => i.RootId, rootId);
            var context = NoSql.MongodbManager<LoggerContext>.Instance.Find(filter).FirstOrDefault();
            if (!string.IsNullOrWhiteSpace(parentId))
            {
                filter = Builders<LoggerContext>.Filter.Eq(i => i.ParentId, parentId);
                context = NoSql.MongodbManager<LoggerContext>.Instance.Find(filter).FirstOrDefault();
            }
            if (context == null)
            {
                context = new LoggerContext
                {
                    RootId = GenerateRootID(),
                    ParentId = null,
                    ChildId = Domain.PrimaryKey.GenerateNewStringId(),
                    MessageBody = "开启一个新的请求:" + url,
                    Url = System.Web.HttpContext.Current.Request.Url.AbsoluteUri.Split(new char[] { '?' }, StringSplitOptions.RemoveEmptyEntries)[],
                    AddTime = DateTime.Now,
                };
                NoSql.MongodbManager<LoggerContext>.Instance.InsertOne(context);
            }
            context.MessageBody = HttpUtility.UrlEncode(context.MessageBody);
            return context;
        }
        /// <summary>
        /// 添加日志，它依赖于一个会话
        /// root->message->message1->message1.1->message1.1.1
        /// </summary>
        /// <param name="parentId">父会话ID</param>
        /// <param name="url"></param>
        /// <param name="message"></param>
        public static LoggerContext LogEvent(string parentId, string url, string message)
        {
            if (GlobalConfig.ConfigManager.Config.Logger.IsHttpClientLog != )
                return new LoggerContext();

            var filter = Builders<LoggerContext>.Filter.Eq(i => i.ChildId, parentId);
            var context = NoSql.MongodbManager<LoggerContext>.Instance.Find(filter).FirstOrDefault();
            if (context != null)
            {
                context = new LoggerContext
                {
                    RootId = context.RootId,
                    ParentId = context.ChildId,
                    ChildId = Domain.PrimaryKey.GenerateNewStringId(),
                    MessageBody = message + ":" + url,
                    Url = System.Web.HttpContext.Current.Request.Url.AbsoluteUri.Split(new char[] { '?' }, StringSplitOptions.RemoveEmptyEntries)[],
                    AddTime = DateTime.Now,
                };
                NoSql.MongodbManager<LoggerContext>.Instance.InsertOne(context);
            }
            return context;
        }
        /// <summary>
        /// 返回当前上下文
        /// </summary>
        /// <returns></returns>
        public static LoggerContext GetCurrentContext(string message, string currentUrl = null)
        {
            try
            {
                currentUrl = (currentUrl ?? System.Web.HttpContext.Current.Request.Url.AbsoluteUri).Split(new char[] { '?' }, StringSplitOptions.RemoveEmptyEntries)[];
                var context = GetContextFromServer();

                if (context == null)
                {
                    context = DoTransaction("", "", currentUrl);

                }
                else
                {
                    context = LogEvent(context.ChildId, currentUrl, message);
                }
                return context;
            }
            catch (Exception ex)
            {
                logger.Logger_Error(ex);
                return new LoggerContext();
            }

        }

        #endregion

        #region 消息树UI
        /// <summary>
        /// 返回UI消息树
        /// </summary>
        /// <returns></returns>
        public static string GetMongoLog(DateTime? fromDate, DateTime? toDate, int page = )
        {
            string from = DateTime.Now.AddYears(-).Date.ToString("yyyy-MM-dd");
            string to = DateTime.Now.Date.AddDays().ToString("yyyy-MM-dd");
            if (fromDate.HasValue)
            {
                from = fromDate.Value.ToString("yyyy-MM-dd");

            }
            if (toDate.HasValue)
            {
                to = toDate.Value.ToString("yyyy-MM-dd");
            }
            var stages = new List<IPipelineStageDefinition>();
            stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$match:{AddTime:{$gt:ISODate('" + from + "'),$lt:ISODate('" + to + "')}}}"));
            stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$group:{_id: \"$RootId\", count: {$sum: 1}}}"));
            stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$skip:" + page *  + "}"));
            stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$limit:5}"));
            var pipeline = new PipelineStagePipelineDefinition<BsonDocument, BsonDocument>(stages);
            var result = NoSql.MongodbManager<LoggerContext>.Collection.Aggregate(pipeline);
            StringBuilder str = new StringBuilder();

            str.Append("<ol class='treeMsg'>");
            foreach (var item in result.ToList())
            {
                var timer = new List<DateTime>();
                var old = NoSql.MongodbManager<LoggerContext>.Instance.Find(i => i.RootId == item.Values.ToArray()[].ToString() && i.ParentId == null).FirstOrDefault();
                timer.Add(old.AddTime);
                str.Append("<li style='margin:5px;border:1px dashed #aaa'>");
                str.AppendFormat("<span style='color:red;'>{0}</span><span style='color:green'>{1}</span><span>{2}</span>"
                   , old.Url
                   , old.MessageBody
                   , old.AddTime);
                MsgTree(str, old.ChildId, timer);
                str.AppendFormat("<p><b><em>本次请求用时{0}毫秒（{1}秒）<em></b></p>"
                    , (timer.Max() - timer.Min()).TotalMilliseconds
                    , (timer.Max() - timer.Min()).TotalSeconds);
                str.Append("</li>");
            }
            str.Append("</ol>");
            return str.ToString();
        }
        #endregion
    }