以下内容在本地主机上进行开发，但在生产中不起作用

Question

I created a class that has a timer that calls a function created in my Azure account to return the status of azure, the return value is cached. In the class I have an WEB API that returns the cached value.

I have Windows form software that calls the WEB API once a minute to get the status.

This all works fine in development on a local host but not in production.

[EnableCorsAttribute("*", "*", "*")]
public class AzureStatusController : ApiController
{
    private readonly int statusTimerInterval = 60 * 1000; // every 60 seconds

    private static bool cloudStatus = false;

    static HttpClient client;
    private static string url = "";
    private static string code = "";

    private System.Threading.Timer cloudTimer;

    /// <summary>
    /// Classes Ctor
    /// </summary>
    public AzureStatusController()
    {
        cloudTimer = new System.Threading.Timer(OnAzureStatusCallback, null, 0, statusTimerInterval);

        url = ConfigurationManager.AppSettings["CloudFunctionsBaseUrl"].ToString();
        code = ConfigurationManager.AppSettings["CloudStatusCode"].ToString();
        client = new HttpClient();
        client.BaseAddress = new Uri(url);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    }

    private void OnAzureStatusCallback(object state)
    {
        var status = false;
        if (client != null && client.BaseAddress.ToString().Length > 30 && code.Length > 70)
        {
            try
            {
                var response = client.GetAsync(code);
                if (response != null && !response.IsFaulted)
                {
                    var result = response.Result;
                    if (result != null && result.IsSuccessStatusCode && result.Content != null)
                    {
                        string responseString = result.Content.ReadAsStringAsync().Result.Trim().ToLower();
                        status = (responseString.Contains("ok"));
                    }
                }
            }
            catch
            {
                status = false;
            }
        }
        cloudStatus = status;
    }

    /// <summary>
    /// Returns the cached value of the Azure status
    /// </summary>
    /// <returns></returns>
    [AllowAnonymous]
    [HttpGet]
    [Route("api/AzureStatus")]
    public IHttpActionResult Get()
    {
        return Ok(cloudStatus);
    }
}

Does anyone have any ideas what I may be missing?

Answer 1

I ended up finding that adding .ToString() to the end of my ConfigurationManager.AppSettings call was causing problem in production but not in development. Rather than spend any more time on this problem I ended up going with the following code:

public class AzureStatusController : ApiController
{
    private static bool cloudStatus = false;
    private static DateTime expiration;

    /// <summary>
    /// Classes Ctor
    /// </summary>
    public AzureStatusController()
    {
        expiration = DateTime.Now.AddHours(-1);
    }

    private void CheckAzureStatus()
    {
        var status = false;
        using (var client = new HttpClient())
        {
            // the following 2 lines should be changed to retrieve the info from 
            var url = ConfigurationManager.AppSettings["CloudFunctionsBaseUrl"];
            var code = ConfigurationManager.AppSettings["CloudStatusCode"];
            client.BaseAddress = new Uri(url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            try
            {
                var response = client.GetAsync(code);
                if (response != null && !response.IsFaulted)
                {
                    var result = response.Result;
                    if (result != null && result.IsSuccessStatusCode && result.Content != null)
                    {
                        string responseString = result.Content.ReadAsStringAsync().Result.Trim().ToLower();
                        status = (responseString.Contains("ok"));
                    }
                }
            }
            catch
            {
                status = false;
            }
        }
        cloudStatus = status;
        expiration = DateTime.Now.AddMinutes(1);
    }

    /// <summary>
    /// Returns the cached value of the Azure status
    /// </summary>
    /// <returns></returns>
    [AllowAnonymous]
    [HttpGet]
    [Route("api/AzureStatus")]
    public IHttpActionResult Get()
    {
        if (expiration < DateTime.Now)
        {
            CheckAzureStatus();
        }
        return Ok(cloudStatus);
    }
}