如何在 WCF 服务上使用 HealthChecksUI

Question

我想知道是否有一些方法可以将 HealthChecks NuGet 添加到 WCF 服务，因为 WCF 服务中没有 Startup.cs 文件，我可以在其中配置此服务。我知道 WCF 服务是 "one big Startup.cs" 但不知道它是如何工作的。

Answer 1

WCF 目前未在 Dotnet Core Framework 中实现。因此，WCF 不支持 class 库。此外，WCF 项目通常托管在 IIS 中，即它是一个虚拟主机。生命周期事件可用于 ServicehostFacotory 扩展。
https://docs.microsoft.com/en-us/dotnet/framework/wcf/extending/extending-hosting-using-servicehostfactory
如果有什么我可以帮忙的，请随时告诉我。

Answer 2

我们必须做一些 json，HealthChecksUI 在 andress 上读取在我的例子中，它在本地主机上.../Service/json/HealthCheck

并且只检查数据库...但是您可以添加一些代码来测试服务的其他部分

你必须使用 Newtonsoft json 库

所以我这样做了：

我服务：

    [OperationContract]
    [WebGet(UriTemplate = "/HealthCheck", BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)]
    Stream HealthCheck();

Service.svc.cs:

public Stream HealthCheck()
{
    var healthChecker = new HealthChecker();
    WebOperationContext.Current.OutgoingResponse.ContentType ="application/json; 
    charset=utf-8";
    return new 
    MemoryStream(Encoding.UTF8.GetBytes(healthChecker.HealthStatus().ToString()));
}

HealthChecker.cs

public class HealthChecker
{
    public bool status { get; set; }

    public TimeSpan totalDuration { get; set; }

    public List<Entry> entries { get; set; }

    public HealthChecker()
    {
        entries = new List<Entry>();
        var watch = System.Diagnostics.Stopwatch.StartNew();
        TimeSpan time;
        string data;
        bool dbOk = TestDbs(out time, out data);

        var entry = new Entry
        {
            Type = "database",
            data = data,
            duration = time,
            status = dbOk
        };
        bool checkStatus = true;

        // Prepared in case of more entries (more controlls in one)
        foreach (var x in entries)
            checkStatus = checkStatus && x.status;

        this.status = checkStatus;
        this.entries.Add(entry);
        watch.Stop();
        time += watch.Elapsed;
        this.totalDuration = time;

    }

    private bool TestDbs(out TimeSpan time, out string exception)
    {
        var watch = System.Diagnostics.Stopwatch.StartNew();
        using (SqlConnection con = new SqlConnection(Properties.Settings.Default.DriverDatabase))
            try
            {
                con.Open();
                watch.Stop();
                time = watch.Elapsed;
                exception = "";
                return true;
            }
            catch (Exception e)
            {
                exception = e.ToString();
                watch.Stop();
                time = watch.Elapsed;
                return false;
            }
    }

    public JObject HealthStatus()
    {
        string stringFormat = "hh\:mm\:ss\.fffffff";
        var json = new JObject(
            new JProperty("status", this.status ? "Healthy" : "Degraded"),
            new JProperty("totalDuration", this.totalDuration.ToString(stringFormat)),
            new JProperty("entries", new JObject(
                new JProperty(this.entries.First().Type, 
                    new JObject(
                        new JProperty("data", 
                            new JObject(this.entries.First().data != null ? new JProperty("Error", this.entries.First().data) : null)),
                        new JProperty("duration", this.entries.First().duration.ToString(stringFormat)),
                        new JProperty("status", this.entries.First().status ? "Healthy" : "Degraded")
                        )
                    )
                )
            )
        );
        return json;
    }
}

Entry.cs

public class Entry
{
    public string Type {get; set; }

    public string data { get; set; }

    public TimeSpan duration { get; set; }

    public bool status { get; set; }
}

最后我添加了 webconfig

 <system.serviceModel>
<bindings>
  <basicHttpBinding>
    <binding maxReceivedMessageSize="10485760">
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="10485760" maxBytesPerRead="4096" maxNameTableCharCount="16384"/>
      <security mode="None"/>
    </binding>
  </basicHttpBinding>
  <basicHttpsBinding>
    <binding maxReceivedMessageSize="20971520">
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="20971520" maxBytesPerRead="4096" maxNameTableCharCount="16384"/>
      <security mode="Transport"/>
    </binding>
  </basicHttpsBinding>
</bindings>
<client/>
<services>
  <service name="DriverService.DriverService">
    <endpoint name="jsonEP"
              address="json"
              binding="webHttpBinding"
              behaviorConfiguration="json"
              contract="DriverService.IDriverService"/>
    <endpoint address="" binding="basicHttpBinding" contract="DriverService.IDriverService"/>
  </service>
</services> 
<behaviors>
  <serviceBehaviors>
    <behavior>
      <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
      <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
      <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
      <serviceDebug includeExceptionDetailInFaults="true"/>
      <serviceThrottling maxConcurrentCalls="256" maxConcurrentInstances="2147483647"/>
    </behavior>
  </serviceBehaviors>
  <endpointBehaviors>
    <behavior name="json">
      <webHttp defaultOutgoingResponseFormat="Json"/>
    </behavior>
  </endpointBehaviors>
</behaviors>

如何在 WCF 服务上使用 HealthChecksUI

How to use HealthChecksUI on WCF service

.net

wcf