private bool ShouldInvalidateServer(
IConnection connection,
Exception exception,
ServerDescription description,
out TopologyVersion invalidatingResponseTopologyVersion)
{
if (exception is MongoConnectionException mongoConnectionException &&
mongoConnectionException.ContainsTimeoutException)
{
invalidatingResponseTopologyVersion = null;
return(false);
}
if (__invalidatingExceptions.Contains(exception.GetType()))
{
invalidatingResponseTopologyVersion = null;
return(true);
}
var exceptionsToCheck = new[]
{
exception as MongoCommandException,
(exception as MongoWriteConcernException)?.MappedWriteConcernResultException
}
.OfType <MongoCommandException>();
foreach (MongoCommandException commandException in exceptionsToCheck)
{
if (IsStateChangeException(commandException))
{
return(!IsStaleStateChangeError(commandException.Result, out invalidatingResponseTopologyVersion));
}
}
invalidatingResponseTopologyVersion = null;
return(false);
bool IsStaleStateChangeError(BsonDocument response, out TopologyVersion nonStaleResponseTopologyVersion)
{
if (ConnectionPool.Generation > connection.Generation)
{
// stale generation number
nonStaleResponseTopologyVersion = null;
return(true);
}
var responseTopologyVersion = TopologyVersion.FromMongoCommandResponse(response);
// We use FresherThanOrEqualTo instead of FresherThan because a state change should come with a new
// topology version.
// We cannot use StalerThan(responseTopologyVersion, description.TopologyVersion) because due to how
// TopologyVersions comparisons are defined, FresherThanOrEqualTo(x, y) does not imply StalerThan(y, x)
bool isStale = TopologyVersion.IsFresherThanOrEqualTo(description.TopologyVersion, responseTopologyVersion);
nonStaleResponseTopologyVersion = isStale ? null : responseTopologyVersion;
return(isStale);
}
}
private bool ShouldInvalidateServer(
IConnection connection,
Exception exception,
ServerDescription description,
out TopologyVersion invalidatingResponseTopologyVersion)
{
if (exception is MongoConnectionException mongoConnectionException &&
mongoConnectionException.ContainsSocketTimeoutException)
{
invalidatingResponseTopologyVersion = null;
return(false);
}
if (__invalidatingExceptions.Contains(exception.GetType()))
{
invalidatingResponseTopologyVersion = null;
return(true);
}
var commandException = exception as MongoCommandException;
if (commandException != null)
{
var code = (ServerErrorCode)commandException.Code;
var message = commandException.ErrorMessage;
if (IsStateChangeError(code, message))
{
return(!IsStaleStateChangeError(commandException.Result, out invalidatingResponseTopologyVersion));
}
if (commandException.GetType() == typeof(MongoWriteConcernException))
{
var writeConcernException = (MongoWriteConcernException)commandException;
var writeConcernResult = writeConcernException.WriteConcernResult;
var response = writeConcernResult.Response;
var writeConcernError = response["writeConcernError"].AsBsonDocument;
if (writeConcernError != null)
{
code = (ServerErrorCode)writeConcernError.GetValue("code", -1).ToInt32();
message = writeConcernError.GetValue("errmsg", null)?.AsString;
if (IsStateChangeError(code, message))
{
return(!IsStaleStateChangeError(commandException.Result, out invalidatingResponseTopologyVersion));
}
}
}
}
invalidatingResponseTopologyVersion = null;
return(false);
bool IsStaleStateChangeError(BsonDocument response, out TopologyVersion nonStaleResponseTopologyVersion)
{
if (_connectionPool.Generation > connection.Generation)
{
// stale generation number
nonStaleResponseTopologyVersion = null;
return(true);
}
var responseTopologyVersion = TopologyVersion.FromMongoCommandResponse(response);
// We use FresherThanOrEqualTo instead of FresherThan because a state change should come with a new
// topology version.
// We cannot use StalerThan(responseTopologyVersion, description.TopologyVersion) because due to how
// TopologyVersions comparisons are defined, FresherThanOrEqualTo(x, y) does not imply StalerThan(y, x)
bool isStale = TopologyVersion.IsFresherThanOrEqualTo(description.TopologyVersion, responseTopologyVersion);
nonStaleResponseTopologyVersion = isStale ? null : responseTopologyVersion;
return(isStale);
}
}
