實時監控Cat之旅~對Get和Post進行封裝，支持分散式消息樹

對第三方介面的調用我們需要對GET和POST進行監控，看一些請求的執行是否成功，如A調用B，B調用C，C調用D，這一連串的東西需要我們使用cat進行記錄，進行記錄之後，我們可以很容易的發現請求響應的時間及是否出錯，下麵是我對這兩種請求的封裝。

    /// <summary>
    /// cat中使用的HttpClient
    /// </summary>
    public class CatHttpClient
    {
        /// <summary>
        /// 返回當前Cat上下文
        /// </summary>
        /// <returns></returns>
        static CatContext GetCurrentContext(string message)
        {

            string currentUrl = System.Web.HttpContext.Current.Request.Url.AbsoluteUri;
            var context = PureCat.CatClient.GetCatContextFromServer();
            if (context == null)
            {
                context = PureCat.CatClient.DoTransaction("xuexiba", currentUrl, () =>
                {
                    PureCat.CatClient.LogEvent("xuexiba", message, "0", currentUrl);
                });

            }
            else
            {

                context = PureCat.CatClient.DoTransaction("xuexiba", currentUrl, () =>
                {
                    PureCat.CatClient.LogRemoteCallServer(context);
                    PureCat.CatClient.LogEvent("xuexiba", message, "0", currentUrl);
                });
            }
            return context;
        }
        /// <summary>
        /// Post數據
        /// </summary>
        /// <param name="requestUri"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static HttpResponseMessage Post(string requestUri, HttpContent content)
        {
            var handler = new HttpClientHandler() { };
            using (var http = new HttpClient(handler))
            {
                PureCat.CatClient.SetCatContextToServer(http, GetCurrentContext("Post Request Sent..."));
                var response = http.PostAsync(requestUri, content).Result;
                return response;
            }
        }
        /// <summary>
        /// Get數據
        /// </summary>
        /// <param name="requestUri"></param>
        /// <returns></returns>
        public static HttpResponseMessage Get(string requestUri)
        {
            var handler = new HttpClientHandler() { };
            using (var http = new HttpClient(handler))
            {
                PureCat.CatClient.SetCatContextToServer(http, GetCurrentContext("Get Request Sent..."));//設置介面api的頭，發送
                var response = http.GetAsync(requestUri).Result;
                return response;
            }
        }
    }

在程式中使用非常方便，如下代碼，一看便知

[AllowAnonymous]
        public void Step1()
        {
            Lind.DDD.CatClientPur.CatHttpClient.Get("Http://localhost:4829/AdminCommon/Step2");
        }

        [AllowAnonymous]
        public void Step2()
        {
            Lind.DDD.CatClientPur.CatHttpClient.Get("Http://localhost:4829/AdminCommon/Step3");
        }

        [AllowAnonymous]
        public void Step3()
        {
            Lind.DDD.CatClientPur.CatHttpClient.Get("Http://localhost:4829/AdminCommon/Step4");
        }
        [AllowAnonymous]
        public void Step4()
        {
            Lind.DDD.CatClientPur.CatHttpClient.Get("Http://localhost:4829/AdminCommon/Error");
        }

而它產生的消息樹也是我們希望看到的，即從step1到step4的記錄，如圖

下一講我們將讀一下，如何對一個請求從開始到結束進行cat的監控，敬請期待！