void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
BundleConfig.RegisterBundles(BundleTable.Bundles);
AuthConfig.RegisterOpenAuth();
if (imageStorePath == null)
{
ImageStorePath = WebConfigurationManager.AppSettings["ImageStorePath"];
}
// initialize storage account configuration setting publisher
CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
{
string connectionString = RoleEnvironment.GetConfigurationSettingValue(configName);
configSetter(connectionString);
});
try
{
// initialize the local cache for the Azure drive
LocalResource cache = RoleEnvironment.GetLocalResource("LocalDriveCache");
CloudDrive.InitializeCache(cache.RootPath + "cache", cache.MaximumSizeInMegabytes);
// retrieve storage account
CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
// retrieve URI for the page blob that contains the cloud drive from configuration settings
string imageStoreBlobUri = RoleEnvironment.GetConfigurationSettingValue("ImageStoreBlobUri");
// unmount any previously mounted drive.
foreach (var drive in CloudDrive.GetMountedDrives())
{
var mountedDrive = new CloudDrive(drive.Value, account.Credentials);
mountedDrive.Unmount();
}
// create the Windows Azure drive and its associated page blob
CloudDrive imageStoreDrive = account.CreateCloudDrive(imageStoreBlobUri);
if (CloudDrive.GetMountedDrives().Count == 0)
{
try
{
imageStoreDrive.Create(16);
}
catch (CloudDriveException)
{
// drive already exists
}
}
// mount the drive and initialize the application with the path to the image store on the Azure drive
Global.ImageStorePath = imageStoreDrive.Mount(cache.MaximumSizeInMegabytes / 2, DriveMountOptions.None);
}
catch (CloudDriveException driveException)
{
Trace.WriteLine("Error: " + driveException.Message);
}
}
public void ListAllMountedDrives()
{
try
{
IDictionary <string, Uri> drives = CloudDrive.GetMountedDrives();
if (drives != null)
{
IEnumerator <KeyValuePair <string, Uri> > e = drives.GetEnumerator();
while (e.MoveNext())
{
string item = string.Format("{0}>{1}", e.Current.Key, e.Current.Value);
if (!lstDrives.Items.Contains(new ListItem(item)))
{
lstDrives.Items.Add(new ListItem(string.Format("{0}>{1}", e.Current.Key, e.Current.Value)));
}
}
}
}
catch (Exception ex)
{
//lblMsg.Text = ex.Message;
}
}
/// <summary>
///
/// </summary>
/// <param name="csa"></param>
/// <param name="vhdUri"></param>
/// <param name="azureDriveCacheDirName"></param>
/// <param name="azureDriveCacheSizeInMB"></param>
/// <param name="azureDriveSizeInMB"></param>
/// <param name="driveOptions"></param>
/// <returns></returns>
public static string MountAzureDrive(CloudStorageAccount csa, Uri vhdUri, string azureDriveCacheDirName, int azureDriveCacheSizeInMB, int azureDriveSizeInMB, DriveMountOptions driveOptions, out bool wasAlreadyMounted)
{
wasAlreadyMounted = false;
// Initialize the cache for mounting the drive.
CloudDrive.InitializeCache(azureDriveCacheDirName, azureDriveCacheSizeInMB);
CloudDrive drive = null;
drive = new CloudDrive(vhdUri, csa.Credentials);
Uri driveUri = CloudDrive.GetMountedDrives().Values.Where(tuple => tuple == vhdUri).FirstOrDefault();
// Find out whether the drive has already been mounted by some other instance.
if (driveUri == null)
{
try
{
// Create the drive. Currently no method is provided to verify whether the
// drive is already created or not.
drive.Create(azureDriveSizeInMB);
}
catch (CloudDriveException)
{
// An exception can be thrown if the drive already exists. Hence ignore the
// exception here. If anything is not right, the Mount() will fail.
}
// Mount the drive.
string driveLetter = drive.Mount(azureDriveCacheSizeInMB, driveOptions);
return(driveLetter);
}
else
{
//Drive is already mounted. So get the drive letter for the drive
IDictionary <string, Uri> drives = CloudDrive.GetMountedDrives();
IEnumerator <KeyValuePair <string, Uri> > e = drives.GetEnumerator();
while (e.MoveNext())
{
if (e.Current.Value == vhdUri)
{
wasAlreadyMounted = true;
return(e.Current.Key);
}
}
}
throw new Exception("Unable to mount the drive." + vhdUri.ToString());
}
protected void Page_PreRender(object sender, EventArgs e)
{
this.GridView1.Columns[this.GridView1.Columns.Count - 1].Visible = this.CurrentPath != Global.ImageStorePath;
if (RoleEnvironment.IsAvailable)
{
this.MountedDrives.DataSource = from item in CloudDrive.GetMountedDrives()
select new
{
Name = item.Key + " => " + item.Value,
Value = item.Key
};
this.MountedDrives.DataBind();
this.MountedDrives.SelectedValue = this.CurrentPath;
this.SelectDrive.Visible = true;
this.NewDrive.Text = this.MountedDrives.Items.Count < 2 ? "New Drive" : "Delete Drive";
}
}
