Merge pull request #174 from dingmeng-xue/telemetry

Catch exception if host is not available

Author: isra-fel

src/Common/AzurePSCmdlet.cs

@@ -870,32 +870,47 @@ public virtual bool IsTerminatingError(Exception ex)
 
         protected string LoadAzVersion()
         {
-            Version latestAz = new Version("0.0.0");
+            Version defautVersion = new Version("0.0.0");
+            if (this.Host == null)
+            {
+                WriteDebug("Cannot fetch Az version due to no host in current environment");
+                return defautVersion.ToString();
+            }
+
+            Version latestAz = defautVersion;
             string latestSuffix = "";
             using (var powershell = System.Management.Automation.PowerShell.Create())
             {
-                powershell.Runspace = RunspaceFactory.CreateRunspace(this.Host);
-                powershell.AddCommand("Get-Module");
-                powershell.AddParameter("Name", "Az");
-                powershell.AddParameter("ListAvailable", true);
-                powershell.Runspace.Open();
-                Collection<PSObject> outputs = powershell.Invoke();
-                foreach (PSObject obj in outputs)
+                try
                 {
-                    string psVersion = obj.Properties["Version"].Value.ToString();
-                    int pos = psVersion.IndexOf('-');
-                    string currentSuffix = (pos == -1 || pos == psVersion.Length - 1) ? "" : psVersion.Substring(pos + 1);
-                    Version currentAz = (pos == -1) ? new Version(psVersion) : new Version(psVersion.Substring(0, pos));
-                    if (currentAz > latestAz)
-                    {
-                        latestAz = currentAz;
-                        latestSuffix = currentSuffix;
-                    }
-                    else if (currentAz == latestAz)
+                    powershell.Runspace = RunspaceFactory.CreateRunspace(this.Host);
+                    powershell.AddCommand("Get-Module");
+                    powershell.AddParameter("Name", "Az");
+                    powershell.AddParameter("ListAvailable", true);
+                    powershell.Runspace.Open();
+                    Collection<PSObject> outputs = powershell.Invoke();
+                    foreach (PSObject obj in outputs)
                     {
-                        latestSuffix = String.Compare(latestSuffix, currentSuffix) > 0 ? latestSuffix : currentSuffix;
+                        string psVersion = obj.Properties["Version"].Value.ToString();
+                        int pos = psVersion.IndexOf('-');
+                        string currentSuffix = (pos == -1 || pos == psVersion.Length - 1) ? "" : psVersion.Substring(pos + 1);
+                        Version currentAz = (pos == -1) ? new Version(psVersion) : new Version(psVersion.Substring(0, pos));
+                        if (currentAz > latestAz)
+                        {
+                            latestAz = currentAz;
+                            latestSuffix = currentSuffix;
+                        }
+                        else if (currentAz == latestAz)
+                        {
+                            latestSuffix = String.Compare(latestSuffix, currentSuffix) > 0 ? latestSuffix : currentSuffix;
+                        }
                     }
                 }
+                catch (Exception e)
+                {
+                    WriteDebug(string.Format("Cannot fetch Az version due to exception: {0}", e.Message));
+                    return defautVersion.ToString();
+                }
             }
             string ret = latestAz.ToString();
             if (!String.IsNullOrEmpty(latestSuffix))