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);
}
}
void Application_End(object sender, EventArgs e)
{
// obtain a reference to the cloud drive and unmount it
CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
string imageStoreBlobUri = RoleEnvironment.GetConfigurationSettingValue("ImageStoreBlobUri");
CloudDrive imageStoreDrive = account.CreateCloudDrive(imageStoreBlobUri);
imageStoreDrive.Unmount();
}
private void CreateDrive()
{
try
{
var vhdUrl = _blobClient.GetContainerReference(_containerName).GetPageBlobReference(_vhdName).Uri.ToString();
_cloudDrive = _ravenDataStorageAccount.CreateCloudDrive(vhdUrl);
_cloudDrive.Create(_localCache.MaximumSizeInMegabytes);
}
catch (CloudDriveException ex)
{
Trace.TraceWarning(ex.Message);
}
}
protected void NewDrive_Click(object sender, EventArgs e)
{
if (RoleEnvironment.IsAvailable)
{
// retrieve storage account
CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
// build page blob URI for the new cloud drive by changing the extension in the original URI
string imageStoreBlobUri = RoleEnvironment.GetConfigurationSettingValue("ImageStoreBlobUri");
string cloneStoreBlobUri = Path.ChangeExtension(imageStoreBlobUri, "bak");
// create drive and its associated page blob
CloudDrive clonedDrive = account.CreateCloudDrive(cloneStoreBlobUri);
if (this.MountedDrives.Items.Count < 2)
{
try
{
clonedDrive.Create(16);
}
catch (CloudDriveException)
{
// cloud drive already exists
}
// mount the drive and retrieve its path
LocalResource cache = RoleEnvironment.GetLocalResource("LocalDriveCache");
string clonedStorePath = clonedDrive.Mount(cache.MaximumSizeInMegabytes / 2, DriveMountOptions.None);
// copy the contents from the original drive to the new drive
foreach (string sourceFileName in Directory.GetFiles(Global.ImageStorePath, "*.*").Where(name => name.EndsWith(".jpg") || name.EndsWith(".png")))
{
string destinationFileName = Path.Combine(clonedStorePath, Path.GetFileName(sourceFileName));
File.Copy(sourceFileName, destinationFileName, true);
}
this.SelectImageStore(clonedStorePath);
}
else
{
clonedDrive.Unmount();
clonedDrive.Delete();
this.SelectImageStore(Global.ImageStorePath);
}
}
}
private static string MountCloudDrive(string uri, string connectionString)
{
Console.WriteLine("Configuring CloudDrive", "Information");
/*
* LocalResource localCache = RoleEnvironment.GetLocalResource("Two10.MountVHD.Cache");
*
* const int TRIES = 30;
*
* // Temporary workaround for ERROR_UNSUPPORTED_OS seen with Windows Azure Drives
* // See http://blogs.msdn.com/b/windowsazurestorage/archive/2010/12/17/error-unsupported-os-seen-with-windows-azure-drives.aspx
* for (int i = 0; i < TRIES; i++)
* {
* try
* {
* CloudDrive.InitializeCache(localCache.RootPath, localCache.MaximumSizeInMegabytes);
* break;
* }
* catch (CloudDriveException ex)
* {
* if (!ex.Message.Equals("ERROR_UNSUPPORTED_OS"))
* {
* throw;
* }
*
* if (i >= (TRIES - 1))
* {
* // If the workaround fails then it would be dangerous to continue silently, so exit
* Console.WriteLine("Workaround for ERROR_UNSUPPORTED_OS see http://bit.ly/fw7qzo FAILED", "Error");
* System.Environment.Exit(-1);
* }
*
* Console.WriteLine("Using temporary workaround for ERROR_UNSUPPORTED_OS see http://bit.ly/fw7qzo", "Information");
* Thread.Sleep(10000);
* }
* }*/
CloudStorageAccount cloudDriveStorageAccount = CloudStorageAccount.Parse(connectionString);
CloudBlobClient blobClient = cloudDriveStorageAccount.CreateCloudBlobClient();
CloudPageBlob pageBlob = blobClient.GetPageBlobReference(uri);
var cloudDrive = cloudDriveStorageAccount.CreateCloudDrive(pageBlob.Uri.ToString());
cloudDrive.CreateIfNotExist(1024 * 250);
try
{
Console.WriteLine(string.Format("Mounting {0}", cloudDrive.Uri), "Information");
return(cloudDrive.Mount(0, DriveMountOptions.None));
}
catch (CloudDriveException e)
{
Console.WriteLine(e);
}
finally
{
Console.WriteLine(string.Format("CloudDrive {0} mounted at {1}", cloudDrive.Uri, cloudDrive.LocalPath), "Information");
}
return(null);
}
private void OnInitialize()
{
var selfInstance = InstanceEnumerator.EnumerateInstances().First(i => i.IsSelf);
cloudStorageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue(ConfigurationSettingsKeys.StorageConnectionString));
log.Info("Storage account selected: {0}", cloudStorageAccount.BlobEndpoint);
cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();
log.Info("Storage client created");
var containerName = ConfigurationProvider.GetSetting(ConfigurationSettingsKeys.StorageContainerName, "ravendb");
// In order to force a connection we just enumerate all available containers:
var availableContainers = cloudBlobClient.ListContainers().ToArray();
foreach (var container in availableContainers)
{
log.Info("Available container: {0}", container.Name);
}
if (!availableContainers.Any(c => c.Name.Equals(containerName)))
{
log.Info("Container {0} does not exist, creating", containerName);
// Container does not exist:
cloudBlobClient.GetContainerReference(containerName).Create();
}
cloudBlobContainer = cloudBlobClient.GetContainerReference(containerName);
log.Info("Container {0} selected", cloudBlobContainer.Name);
localCache = RoleEnvironment.GetLocalResource(ConfigurationSettingsKeys.StorageCacheResource);
log.Info("Cache resource retrieved: {0}, path: {1}", localCache.Name, localCache.RootPath);
CloudDrive.InitializeCache(localCache.RootPath, localCache.MaximumSizeInMegabytes);
log.Info("Cache initialized: {0} mb", localCache.MaximumSizeInMegabytes);
var driveName = string.Format("{0}{1}.vhd", selfInstance.InstanceType, selfInstance.InstanceIndex).ToLowerInvariant();
log.Info("Virtual drive name: {0}", driveName);
var pageBlob = cloudBlobContainer.GetPageBlobReference(driveName);
log.Info("Virtual drive blob: {0}", pageBlob.Uri);
cloudDrive = cloudStorageAccount.CreateCloudDrive(pageBlob.Uri.ToString());
log.Info("Virtual drive created: {0}", cloudDrive.Uri);
var storageSize = ConfigurationProvider.GetSetting(ConfigurationSettingsKeys.StorageSize, 50000);
log.Info("Storage size: {0} mb", storageSize);
cloudDrive.CreateIfNotExist(storageSize);
log.Info("Virtual drive initialized: {0}", cloudDrive.Uri);
var mountedDirectoryPath = cloudDrive.Mount(storageSize, DriveMountOptions.None);
log.Info("Virtual drive mounted at: {0}", mountedDirectoryPath);
mountedDirectory = new DirectoryInfo(mountedDirectoryPath);
log.Info("Ensuring drive is available: {0}", mountedDirectoryPath);
UpdateTestFile();
log.Info("Storage initialization succeeded");
}
internal static string GetMountedPathFromBlob(
string localCachePath,
string cloudDir,
string containerName,
string blobName,
int driveSize,
out CloudDrive mongoDrive)
{
DiagnosticsHelper.TraceInformation(string.Format("In mounting cloud drive for dir {0} on {1} with {2}",
cloudDir,
containerName,
blobName));
CloudStorageAccount storageAccount = CloudStorageAccount.FromConfigurationSetting(cloudDir);
var blobClient = storageAccount.CreateCloudBlobClient();
DiagnosticsHelper.TraceInformation("Get container");
// this should be the name of your replset
var driveContainer = blobClient.GetContainerReference(containerName);
// create blob container (it has to exist before creating the cloud drive)
try
{
driveContainer.CreateIfNotExist();
}
catch (Exception e)
{
DiagnosticsHelper.TraceInformation("Exception when creating container");
DiagnosticsHelper.TraceInformation(e.Message);
DiagnosticsHelper.TraceInformation(e.StackTrace);
}
var mongoBlobUri = blobClient.GetContainerReference(containerName).GetPageBlobReference(blobName).Uri.ToString();
DiagnosticsHelper.TraceInformation(string.Format("Blob uri obtained {0}", mongoBlobUri));
// create the cloud drive
mongoDrive = storageAccount.CreateCloudDrive(mongoBlobUri);
try
{
mongoDrive.Create(driveSize);
}
catch (Exception e)
{
// exception is thrown if all is well but the drive already exists
DiagnosticsHelper.TraceInformation("Exception when creating cloud drive. safe to ignore");
DiagnosticsHelper.TraceInformation(e.Message);
DiagnosticsHelper.TraceInformation(e.StackTrace);
}
DiagnosticsHelper.TraceInformation("Initialize cache");
var localStorage = RoleEnvironment.GetLocalResource(localCachePath);
CloudDrive.InitializeCache(localStorage.RootPath.TrimEnd('\\'),
localStorage.MaximumSizeInMegabytes);
// mount the drive and get the root path of the drive it's mounted as
try
{
DiagnosticsHelper.TraceInformation(string.Format("Trying to mount blob as azure drive on {0}",
RoleEnvironment.CurrentRoleInstance.Id));
var driveLetter = mongoDrive.Mount(localStorage.MaximumSizeInMegabytes,
DriveMountOptions.None);
DiagnosticsHelper.TraceInformation(string.Format("Write lock acquired on azure drive, mounted as {0}, on role instance",
driveLetter, RoleEnvironment.CurrentRoleInstance.Id));
return(driveLetter);
}
catch (Exception e)
{
DiagnosticsHelper.TraceWarning("could not acquire blob lock.");
DiagnosticsHelper.TraceWarning(e.Message);
DiagnosticsHelper.TraceWarning(e.StackTrace);
throw;
}
}