internal static string GetMountedPathFromBlob(
string localCachePath,
string containerName,
string blobName,
int driveSize,
out CloudDrive elasticDrive)
{
DiagnosticsHelper.TraceInformation(
"In mounting cloud drive for on {0} with {1}",
containerName,
blobName);
var connectionString = RoleEnvironment.GetConfigurationSettingValue("DataConnectionString");
connectionString = connectionString.Replace("DefaultEndpointsProtocol=https", "DefaultEndpointsProtocol=http");
var storageAccount = CloudStorageAccount.Parse(connectionString);
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 (StorageException e)
{
DiagnosticsHelper.TraceInformation(
"Container creation failed with {0} {1}",
e.Message,
e.StackTrace);
}
var blobUri = blobClient.GetContainerReference(containerName).GetPageBlobReference(blobName).Uri.ToString();
DiagnosticsHelper.TraceInformation("Blob uri obtained {0}", blobUri);
// create the cloud drive
elasticDrive = storageAccount.CreateCloudDrive(blobUri);
try
{
elasticDrive.CreateIfNotExist(driveSize);
}
catch (CloudDriveException e)
{
DiagnosticsHelper.TraceInformation(
"Drive creation failed with {0} {1}",
e.Message,
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(
"Trying to mount blob as azure drive");
var driveLetter = elasticDrive.Mount(localStorage.MaximumSizeInMegabytes,
DriveMountOptions.None);
DiagnosticsHelper.TraceInformation(
"Write lock acquired on azure drive, mounted as {0}",
driveLetter);
return driveLetter;
}
catch (CloudDriveException e)
{
DiagnosticsHelper.TraceCritical(
"Failed to mount cloud drive with {0} {1}",
e.Message,
e.StackTrace);
throw;
}
}
