/// <summary>
/// Initializes a new instance of the <see cref="AdalCache"/> class.
/// </summary>
/// <param name="storage">Adal cache storage</param>
/// <param name="logger">Logger</param>
/// <param name="lockRetryDelay">Delay in ms between retries if cache lock is contended</param>
/// <param name="lockRetryCount">Number of retries if cache lock is contended</param>
public AdalCache(AdalCacheStorage storage, TraceSource logger, int lockRetryDelay, int lockRetryCount)
{
_logger = logger ?? s_staticLogger.Value;
_store = storage ?? throw new ArgumentNullException(nameof(storage));
_lockFileRetryCount = lockRetryCount;
_lockFileRetryDelay = lockRetryDelay;
AfterAccess = AfterAccessNotification;
BeforeAccess = BeforeAccessNotification;
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Initializing adal cache");
byte[] data = _store.ReadData();
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Read '{data?.Length}' bytes from storage");
if (data != null && data.Length > 0)
{
try
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Deserializing data into memory");
DeserializeAdalV3(data);
}
catch (Exception e)
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"An exception was encountered while deserializing the data during initialization of {nameof(AdalCache)} : {e}");
DeserializeAdalV3(null);
_store.Clear();
}
}
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Done initializing");
}
// Triggered right before ADAL needs to access the cache.
// Reload the cache from the persistent store in case it changed since the last access.
private void BeforeAccessNotification(TokenCacheNotificationArgs args)
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Before access");
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Acquiring lock for token cache");
_cacheLock = new CrossPlatLock(
Path.GetFileNameWithoutExtension(_store.CreationProperties.CacheFileName),
Path.Combine(_store.CreationProperties.CacheDirectory, _store.CreationProperties.CacheFileName) + ".lockfile");
if (_store.HasChanged)
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Before access, the store has changed");
byte[] fileData = _store.ReadData();
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Read '{fileData?.Length}' bytes from storage");
if (fileData != null && fileData.Length > 0)
{
try
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"Deserializing the store");
DeserializeAdalV3(fileData);
}
catch (Exception e)
{
_logger.TraceEvent(TraceEventType.Error, /*id*/ 0, $"An exception was encountered while deserializing the {nameof(AdalCache)} : {e}");
_logger.TraceEvent(TraceEventType.Error, /*id*/ 0, $"No data found in the store, clearing the cache in memory.");
// Clear the memory cache
DeserializeAdalV3(null);
_store.Clear();
throw;
}
}
else
{
_logger.TraceEvent(TraceEventType.Information, /*id*/ 0, $"No data found in the store, clearing the cache in memory.");
// Clear the memory cache
DeserializeAdalV3(null);
}
}
}
// Triggered right before ADAL needs to access the cache.
// Reload the cache from the persistent store in case it changed since the last access.
// Internal for testing.
internal void BeforeAccessNotification(TokenCacheNotificationArgs args)
{
_logger.LogInformation($"Before access");
_logger.LogInformation($"Acquiring lock for token cache");
_cacheLock = new CrossPlatLock(Path.Combine(_store.CreationProperties.CacheDirectory, _store.CreationProperties.CacheFileName) + ".lockfile", this._lockFileRetryDelay, this._lockFileRetryCount);
_logger.LogInformation($"Before access, the store has changed");
byte[] fileData = _store.ReadData();
_logger.LogInformation($"Read '{fileData?.Length}' bytes from storage");
if (fileData != null && fileData.Length > 0)
{
try
{
_logger.LogInformation($"Deserializing the store");
DeserializeAdalV3(fileData);
}
catch (Exception e)
{
_logger.LogError($"An exception was encountered while deserializing the {nameof(AdalCache)} : {e}");
_logger.LogError($"No data found in the store, clearing the cache in memory.");
// Clear the memory cache
DeserializeAdalV3(null);
_store.Clear();
throw;
}
}
else
{
_logger.LogInformation($"No data found in the store, clearing the cache in memory.");
// Clear the memory cache
DeserializeAdalV3(null);
}
}