public bool TryTranslateMessage(Exception ex, out RESTError webServiceError)
{
Preconditions.ThrowIfNull(ex, nameof(ex));
webServiceError = null;
// Unwrap the NHibernate generic exception if it is present
var exception = ex is GenericADOException
? ex.InnerException
: ex;
if (exception is DatabaseConnectionException &&
_snapshotContextProvider.GetSnapshotContext() != null)
{
webServiceError = new RESTError
{
Code = (int)HttpStatusCode.Gone,
Type = HttpStatusCode.Gone.ToString().NormalizeCompositeTermForDisplay(),
Message = "Snapshot not available."
};
return(true);
}
return(false);
}
/// <summary>
/// Gets the replacement token with a snapshot-specific suffix appended.
/// </summary>
/// <returns>The configured token replacement with a snapshot database suffix appended.</returns>
/// <exception cref="FormatException">Occurs if the snapshot identifier in context
/// is not an alphanumeric value.</exception>
public string GetReplacementToken()
{
var snapshotContext = _snapshotContextProvider.GetSnapshotContext();
if (snapshotContext == null || string.IsNullOrEmpty(snapshotContext.SnapshotIdentifier))
{
return(_next.GetReplacementToken());
}
// To prevent possible tampering, snapshot identifier must only contain letters or numbers.
if (snapshotContext.SnapshotIdentifier.Any(c => !(char.IsLetter(c) || char.IsDigit(c))))
{
throw new FormatException("Invalid value for snapshot identifier.");
}
return(_next.GetReplacementToken() + $"_SS{snapshotContext.SnapshotIdentifier}");
}