internal static T Expect <T>(IBackendMessage msg, NpgsqlConnector connector)
{
if (msg is T asT)
{
return(asT);
}
connector.Break();
throw new NpgsqlException($"Received backend message {msg.Code} while expecting {typeof(T).Name}. Please file a bug.");
}
bool ProcessMessageForUnprepared(IBackendMessage msg, CommandBehavior behavior)
{
Contract.Requires(!IsPrepared);
switch (msg.Code)
{
case BackendMessageCode.CompletedResponse: // e.g. begin transaction
case BackendMessageCode.ParseComplete:
case BackendMessageCode.ParameterDescription:
return(false);
case BackendMessageCode.RowDescription:
Contract.Assert(_queryIndex < _queries.Count);
var description = (RowDescriptionMessage)msg;
FixupRowDescription(description, _queryIndex == 0);
_queries[_queryIndex].Description = description;
if ((behavior & CommandBehavior.SchemaOnly) != 0)
{
_queryIndex++;
}
return(false);
case BackendMessageCode.NoData:
Contract.Assert(_queryIndex < _queries.Count);
_queries[_queryIndex].Description = null;
return(false);
case BackendMessageCode.BindComplete:
Contract.Assume((behavior & CommandBehavior.SchemaOnly) == 0);
return(++_queryIndex == _queries.Count);
case BackendMessageCode.ReadyForQuery:
Contract.Assume((behavior & CommandBehavior.SchemaOnly) != 0);
return(true); // End of a SchemaOnly command
default:
throw _connector.UnexpectedMessageReceived(msg.Code);
}
}
bool ProcessMessageForUnprepared(IBackendMessage msg, CommandBehavior behavior)
{
Contract.Requires(!IsPrepared);
switch (msg.Code) {
case BackendMessageCode.CompletedResponse: // e.g. begin transaction
case BackendMessageCode.ParseComplete:
case BackendMessageCode.ParameterDescription:
return false;
case BackendMessageCode.RowDescription:
Contract.Assert(_queryIndex < _queries.Count);
var description = (RowDescriptionMessage)msg;
FixupRowDescription(description, _queryIndex == 0);
_queries[_queryIndex].Description = description;
if ((behavior & CommandBehavior.SchemaOnly) != 0) {
_queryIndex++;
}
return false;
case BackendMessageCode.NoData:
Contract.Assert(_queryIndex < _queries.Count);
_queries[_queryIndex].Description = null;
return false;
case BackendMessageCode.BindComplete:
Contract.Assume((behavior & CommandBehavior.SchemaOnly) == 0);
return ++_queryIndex == _queries.Count;
case BackendMessageCode.ReadyForQuery:
Contract.Assume((behavior & CommandBehavior.SchemaOnly) != 0);
return true; // End of a SchemaOnly command
default:
throw _connector.UnexpectedMessageReceived(msg.Code);
}
}
internal static T Expect <T>(IBackendMessage msg) => msg is T asT
