原文：http://www.cnblogs.com/lc-chenlong/p/4241204.html
本文主要介绍在请求WebApi时，监控Action执行的时间，及Action传递的参数值，以及Http请求头信息。采用log4net记录监控日志，通过日志记录的时间方便我们定位哪一个Action执行的时间过长，进而采取优化的手段。
监控日志监控的指标如下图
监控程序实现
改监控程序主要继承ActionFilterAttribute类，在命名空间：System.Web.Http.Filters中，重写OnActionExecuted(HttpActionExecutedContext actionExecutedContext) 和OnActionExecuting(HttpActionContext actionContext)两个方法。在上一篇文章介绍MVC的监控也是重写ActionFilterAttribute类，但是MVC的ActionFilterAttribute在System.Web.Mvc命名空间下。
1、监控日志对象
/// <summary>
/// 监控日志对象
/// </summary>
public class WebApiMonitorLog
{
public string ControllerName
{
get;
set;
}
public string ActionName
{
get;
set;
}
public DateTime ExecuteStartTime
{
get;
set;
}
public DateTime ExecuteEndTime
{
get;
set;
}
/// <summary>
/// 请求的Action 参数
/// </summary>
public Dictionary<string, object> ActionParams
{
get;
set;
}
/// <summary>
/// Http请求头
/// </summary>
public string HttpRequestHeaders
{
get;
set;
}
/// <summary>
/// 请求方式
/// </summary>
public string HttpMethod
{
get;
set;
}
/// <summary>
/// 请求的IP地址
/// </summary>
public string IP
{
get;
set;
}
/// <summary>
/// 获取监控指标日志
/// </summary>
/// <param name="mtype"></param>
/// <returns></returns>
public string GetLoginfo()
{
string Msg = @"
Action执行时间监控：
ControllerName：{0}Controller
ActionName:{1}
开始时间：{2}
结束时间：{3}
总 时 间：{4}秒
Action参数：{5}
Http请求头:{6}
客户端IP：{7},
HttpMethod:{8}
";
return string.Format(Msg,
ControllerName,
ActionName,
ExecuteStartTime,
ExecuteEndTime,
(ExecuteEndTime - ExecuteStartTime).TotalSeconds,
GetCollections(ActionParams),
HttpRequestHeaders,
IP,
HttpMethod);
}
/// <summary>
/// 获取Action 参数
/// </summary>
/// <param name="Collections"></param>
/// <returns></returns>
public string GetCollections(Dictionary<string, object> Collections)
{
string Parameters = string.Empty;
if (Collections == null || Collections.Count == 0)
{
return Parameters;
}
foreach (string key in Collections.Keys)
{
Parameters += string.Format("{0}={1}&", key, Collections[key]);
}
if (!string.IsNullOrWhiteSpace(Parameters) && Parameters.EndsWith("&"))
{
Parameters = Parameters.Substring(0, Parameters.Length - 1);
}
return Parameters;
}
/// <summary>
/// 获取IP
/// </summary>
/// <returns></returns>
public string GetIP()
{
string ip = string.Empty;
if (!string.IsNullOrEmpty(System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"]))
ip = Convert.ToString(System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]);
if (string.IsNullOrEmpty(ip))
ip = Convert.ToString(System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]);
return ip;
}
}
2、监控程序
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)]
public class WebApiTrackerAttribute : ActionFilterAttribute//, ExceptionFilterAttribute
{
private readonly string Key = "_thisWebApiOnActionMonitorLog_";
public override void OnActionExecuting(HttpActionContext actionContext)
{
base.OnActionExecuting(actionContext);
WebApiMonitorLog MonLog = new WebApiMonitorLog();
MonLog.ExecuteStartTime = DateTime.Now;
//获取Action 参数
MonLog.ActionParams = actionContext.ActionArguments;
MonLog.HttpRequestHeaders = actionContext.Request.Headers.ToString();
MonLog.HttpMethod = actionContext.Request.Method.Method;
actionContext.Request.Properties[Key] = MonLog;
var form=System.Web.HttpContext.Current.Request.Form;
#region 如果参数是实体对象，获取序列化后的数据
Stream stream = actionContext.Request.Content.ReadAsStreamAsync().Result;
Encoding encoding = Encoding.UTF8;
stream.Position = 0;
string responseData = "";
using (StreamReader reader = new StreamReader(stream, encoding))
{
responseData = reader.ReadToEnd().ToString();
}
if (!string.IsNullOrWhiteSpace(responseData) && !MonLog.ActionParams.ContainsKey("__EntityParamsList__"))
{
MonLog.ActionParams["__EntityParamsList__"] = responseData;
}
#endregion
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
WebApiMonitorLog MonLog = actionExecutedContext.Request.Properties[Key] as WebApiMonitorLog;
MonLog.ExecuteEndTime = DateTime.Now;
MonLog.ActionName = actionExecutedContext.ActionContext.ActionDescriptor.ActionName;
MonLog.ControllerName = actionExecutedContext.ActionContext.ActionDescriptor.ControllerDescriptor.ControllerName;
Log.Info(MonLog.GetLoginfo());
if (actionExecutedContext.Exception != null)
{
string Msg = string.Format(@"
请求【{0}Controller】的【{1}】产生异常：
Action参数：{2}
Http请求头:{3}
客户端IP：{4},
HttpMethod:{5}
", MonLog.ControllerName, MonLog.ActionName, MonLog.GetCollections(MonLog.ActionParams), MonLog.HttpRequestHeaders, MonLog.GetIP(), MonLog.HttpMethod);
Log.Error(Msg, actionExecutedContext.Exception);
}
}
}
3、引用监控
我们可以在每个WebApiController类上或Action上直接引用 [WebApiTracker]即可完成对该WebApiController或Action的监控。
我们也可以在Global.asax中注册全局监控，这样我们就可以监控每一个WebApiController中的Action，代码如下：
protected void Application_Start()
{
GlobalConfiguration.Configuration.Filters.Add(new WebApiTrackerAttribute());
AreaRegistration.RegisterAllAreas();
}