クラウド側から IoT Edge 上のモジュールの状態を監視する方法

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Globalization;

using System.Net;

using System.Net.Http;

using System.Security.Cryptography;

using System.Net.Http.Headers;

namespace IoTREST

{

    public class IoTRESTClient

    {

        private string IoTHubName;

        private string httpResult;

        private string Key;

        private string policyName;

        public IoTRESTClient(string _IoTHubName, string _Key, string _policyName)

        {

            IoTHubName = _IoTHubName;

            httpResult = "";

            Key = _Key;

            policyName = _policyName;

        }

        public string generateSasToken(string resourceUri, string key, string policyName, int expiryInSeconds =
3600)

        {

            TimeSpan fromEpochStart = DateTime.UtcNow - new DateTime(1970, 1, 1);

            string expiry = Convert.ToString((int)fromEpochStart.TotalSeconds + expiryInSeconds);

            string stringToSign = WebUtility.UrlEncode(resourceUri).ToLower() + "n" + expiry;

            HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(key));

            string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));

            string token = String.Format(CultureInfo.InvariantCulture, "SharedAccessSignature sr={0}&sig={1}&se={2}", WebUtility.UrlEncode(resourceUri).ToLower(), WebUtility.UrlEncode(signature), expiry);

            if (!String.IsNullOrEmpty(policyName))

            {

                token += "&skn=" + policyName;

            }

            return token;

        }

        public async void GetModuleTwin(string deviceId, string moduleId)

        {

            HttpClient client = new HttpClient();

            string uri = "https://" + IoTHubName + ".azure-devices.net/twins/" + deviceId + "/modules/"+ moduleId + "?api-version=2017-11-08-preview";

            Console.WriteLine("uri:" + uri);

            HttpResponseMessage response;

            string sasToken = generateSasToken(IoTHubName + ".azure-devices.net", Key, policyName);

            Console.WriteLine("sasToken:" + sasToken);

            client.DefaultRequestHeaders.Add("Authorization", sasToken);

            try

            {

                response = await client.GetAsync(uri);

                httpResult = await response.Content.ReadAsStringAsync();

                Console.WriteLine(response.StatusCode.ToString() + "rn" + httpResult);

            }

            catch (Exception ex)

            {

                Console.WriteLine();

                Console.WriteLine("Error in sample: {0}", ex.Message);

            }

        }

        class Program

        {

            static void Main(string[] args)

            {

                IoTRESTClient client = new IoTRESTClient("{IoT Hub Name}", "{Shared access keys}", "{Policy Name, e.g. iothubowner}");

                client.GetModuleTwin("test-edge-device1", "$edgeAgent");

                Console.ReadKey();

                Console.WriteLine("Press any key to exit...");

            }

       }

    }

}