SF-4342 EC2 instances are incorrectly identifying the Device Name.

Author: Dan Gidman

Src/StackifyLib/Models/EnvironmentDetail.cs

@@ -1,8 +1,12 @@
 using System;
 using System.Configuration;
+using System.IO;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Management;
+using System.Net;
 using System.Runtime.Serialization;
+using System.Text;
 using System.Text.RegularExpressions;
 using System.Web.Hosting;
 using StackifyLib.Utils;
@@ -94,6 +98,39 @@ private void GetAzureInfo()
             }
         }
 
+        // http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html#d0e30002
+        const string EC2InstanceIdUrl = "http://169.254.169.254/latest/meta-data/instance-id";
+
+        /// <summary>
+        /// Get the EC2 Instance name if it exists else null
+        /// </summary>
+        public static string GetEC2InstanceId()
+        {
+            try
+            {
+                var request = (HttpWebRequest)WebRequest.Create(EC2InstanceIdUrl);
+                // wait 5 seconds
+                request.Timeout = 5000;
+                using (var response = (HttpWebResponse) request.GetResponse())
+                {
+                    var encoding = Encoding.GetEncoding(response.CharacterSet);
+                    using (var responseStream = response.GetResponseStream())
+                    {
+                        using (var reader = new StreamReader(responseStream, encoding))
+                        {
+                            var id = reader.ReadToEnd();
+                            return string.IsNullOrWhiteSpace(id) ? null : id;
+                        }
+                    }
+                }
+            }
+            catch // if not in aws this will timeout
+            {
+                return null;
+            }
+
+        }
+
         /// <summary>
         /// Get the display name of the windows service if it is a windows service
         /// </summary>
@@ -226,7 +263,7 @@ public EnvironmentDetail(bool loadDetails)
                     IsWindowService();
                 }
 
-                DeviceName = Environment.MachineName;
+                DeviceName = GetEC2InstanceId() ?? Environment.MachineName;
 
                 if (string.IsNullOrEmpty(AppName) && !isWebRequest)
                 {