/// <inheritdoc />
public async Task <bool> AcquireLeaseAsync(Lease lease)
{
var azureLease = (AzureBlobLease)lease;
CloudBlockBlob leaseBlob = azureLease.Blob;
bool retval = true;
string newLeaseId = Guid.NewGuid().ToString();
string partitionId = lease.PartitionId;
_leaseUpdateCounter.Increment();
using (_logger.BeginScope("Acquire Lease"))
{
_logger.LogInformation("Acquiring lease for partition {partitionId}", lease.PartitionId);
try
{
bool renewLease = false;
string newToken;
using (_storagePerformanceSummary.Time())
{
await leaseBlob.FetchAttributesAsync(_defaultAccessCondition, _defaultRequestOptions, _operationContext).ConfigureAwait(false);
}
if (leaseBlob.Properties.LeaseState == LeaseState.Leased)
{
if (string.IsNullOrEmpty(lease.Token))
{
return(false);
}
_logger.LogInformation("Need to ChangeLease: Partition Id: {partitionId}", lease.PartitionId);
renewLease = true;
using (_storagePerformanceSummary.Time())
{
newToken = await leaseBlob.ChangeLeaseAsync(newLeaseId, AccessCondition.GenerateLeaseCondition(lease.Token), _defaultRequestOptions, _operationContext).ConfigureAwait(false);
}
}
else
{
_logger.LogInformation("Need to AcquireLease: Partition Id: {partitionId}", lease.PartitionId);
using (_storagePerformanceSummary.Time())
{
newToken = await leaseBlob.AcquireLeaseAsync(LeaseDuration, newLeaseId, _defaultAccessCondition, _defaultRequestOptions, _operationContext).ConfigureAwait(false);
}
}
lease.Token = newToken;
lease.Owner = _eventProcessorHostName;
lease.IncrementEpoch(); // Increment epoch each time lease is acquired or stolen by a new host
if (renewLease)
{
await RenewLeaseCoreAsync(azureLease).ConfigureAwait(false);
}
leaseBlob.Metadata[MetaDataOwnerName] = lease.Owner;
using (_storagePerformanceSummary.Time())
{
await leaseBlob.SetMetadataAsync(AccessCondition.GenerateLeaseCondition(lease.Token), _defaultRequestOptions, _operationContext).ConfigureAwait(false);
}
using (_storagePerformanceSummary.Time())
{
await leaseBlob.UploadTextAsync(JsonConvert.SerializeObject(lease), _leaseEncoding, AccessCondition.GenerateLeaseCondition(lease.Token), _defaultRequestOptions, _operationContext).ConfigureAwait(false);
}
}
catch (StorageException e)
{
_leaseErrorCounter.Increment();
var se = AzureBlobCommon.CheckForLeaseLostException(partitionId, e, _logger);
_logger.LogError(se, "Error acquiring lease for partition {partitionId}", lease.PartitionId);
throw se;
}
}
return(retval);
}
