/// <inheritdoc/>
public Lease FromLeaseToken(string leaseToken)
{
if (leaseToken is null)
{
throw new ArgumentNullException(nameof(leaseToken));
}
return(AzureLease.FromToken(this, leaseToken));
}
/// <inheritdoc/>
public async Task <Lease> AcquireAsync(LeasePolicy leasePolicy, string?proposedLeaseId = null)
{
if (leasePolicy is null)
{
throw new ArgumentNullException(nameof(leasePolicy));
}
this.logger.LogDebug($"Acquiring lease for '{leasePolicy.ActorName}' with name '{leasePolicy.Name}', duration '{leasePolicy.Duration}', and proposed id '{proposedLeaseId}'");
try
{
await this.InitialiseAsync().ConfigureAwait(false);
// Once Initialise has been called, we know this.container is set.
CloudBlockBlob blob = this.container !.GetBlockBlobReference((leasePolicy.Name ?? Guid.NewGuid().ToString()).ToLowerInvariant());
await Retriable.RetryAsync(
async() =>
{
try
{
if (!await blob.ExistsAsync().ConfigureAwait(false))
{
using var ms = new MemoryStream();
await blob.UploadFromStreamAsync(ms).ConfigureAwait(false);
}
}
catch (StorageException ex) when(ex.RequestInformation.HttpStatusCode == 400)
{
// Turn that into an invalid operation exception for standard "bad request" semantics (bad name)
throw new InvalidOperationException();
}
catch (ArgumentOutOfRangeException)
{
// Turn that into an invalid operation exception for standard "bad request" semantics (bad duration)
throw new InvalidOperationException();
}
},
CancellationToken.None,
new Count(10),
new AggregatePolicy { Policies = { new DoNotRetryOnInvalidOperationPolicy(), new DoNotRetryOnConflictPolicy(), new DoNotRetryOnInitializationFailurePolicy() } }).ConfigureAwait(false);
string id = await Retriable.RetryAsync(
async() =>
{
try
{
return(await blob.AcquireLeaseAsync(leasePolicy.Duration, proposedLeaseId));
}
catch (StorageException ex) when(ex.RequestInformation.HttpStatusCode == 400)
{
// Turn that into an invalid operation exception for standard "bad request" semantics (bad name)
throw new InvalidOperationException();
}
catch (ArgumentOutOfRangeException)
{
// Turn that into an invalid operation exception for standard "bad request" semantics (bad duration)
throw new InvalidOperationException();
}
},
CancellationToken.None,
new Count(10),
new AggregatePolicy { Policies = { new DoNotRetryOnInvalidOperationPolicy(), new DoNotRetryOnConflictPolicy(), new DoNotRetryOnInitializationFailurePolicy() } }).ConfigureAwait(false);
var lease = new AzureLease(this, leasePolicy, id);
lease.SetLastAcquired(DateTimeOffset.Now);
this.logger.LogDebug($"Acquired lease for '{leasePolicy.ActorName}' with name '{leasePolicy.Name}', duration '{leasePolicy.Duration}', and actual id '{id}'");
return(lease);
}
catch (StorageException exception)
{
if (exception.RequestInformation.HttpStatusCode == 409)
{
this.logger.LogError($"Failed to acquire lease for '{leasePolicy.ActorName}'. The lease was held by another party. The lease name was '{leasePolicy.Name}', duration '{leasePolicy.Duration}', and proposed id '{proposedLeaseId}'");
throw new LeaseAcquisitionUnsuccessfulException(leasePolicy, exception);
}
else
{
this.logger.LogError($"Failed to acquire lease for '{leasePolicy.ActorName}' due to storage failure. The lease name was '{leasePolicy.Name}', duration '{leasePolicy.Duration}', and proposed id '{proposedLeaseId}'");
throw;
}
}
catch (InitializationFailureException)
{
this.logger.LogError($"Failed to acquire lease for '{leasePolicy.ActorName}' due to storage intiialization failure. The lease name was '{leasePolicy.Name}', duration '{leasePolicy.Duration}', and proposed id '{proposedLeaseId}'");
throw;
}
}