126 lines
4.4 KiB
C++
126 lines
4.4 KiB
C++
/*
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* Copyright (c) 2015, Cryptonomex, Inc.
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* All rights reserved.
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*
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* This source code is provided for evaluation in private test networks only, until September 8, 2015. After this date, this license expires and
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* the code may not be used, modified or distributed for any purpose. Redistribution and use in source and binary forms, with or without modification,
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* are permitted until September 8, 2015, provided that the following conditions are met:
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*
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* 1. The code and/or derivative works are used only for private test networks consisting of no more than 10 P2P nodes.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <graphene/chain/database.hpp>
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/*
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* This file provides with() functions which modify the database
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* temporarily, then restore it. These functions are mostly internal
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* implementation detail of the database.
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*
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* Essentially, we want to be able to use "finally" to restore the
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* database regardless of whether an exception is thrown or not, but there
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* is no "finally" in C++. Instead, C++ requires us to create a struct
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* and put the finally block in a destructor. Aagh!
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*/
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namespace graphene { namespace chain { namespace detail {
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/**
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* Class used to help the with_skip_flags implementation.
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* It must be defined in this header because it must be
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* available to the with_skip_flags implementation,
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* which is a template and therefore must also be defined
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* in this header.
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*/
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struct skip_flags_restorer
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{
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skip_flags_restorer( node_property_object& npo, uint32_t old_skip_flags )
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: _npo( npo ), _old_skip_flags( old_skip_flags )
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{}
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~skip_flags_restorer()
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{
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_npo.skip_flags = _old_skip_flags;
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}
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node_property_object& _npo;
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uint32_t _old_skip_flags;
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};
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/**
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* Class used to help the without_pending_transactions
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* implementation.
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*/
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struct pending_transactions_restorer
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{
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pending_transactions_restorer( database& db, std::vector<processed_transaction>&& pending_transactions )
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: _db(db), _pending_transactions( std::move(pending_transactions) )
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{
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_db.clear_pending();
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}
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~pending_transactions_restorer()
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{
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for( const processed_transaction& tx : _pending_transactions )
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{
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try
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{
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// since push_transaction() takes a signed_transaction,
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// the operation_results field will be ignored.
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_db.push_transaction( tx );
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}
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catch( const fc::exception& e )
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{
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wlog( "Pending transaction became invalid after switching to block ${b}", ("b", _db.head_block_id()) );
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wlog( "The invalid pending transaction is ${t}", ("t", tx) );
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wlog( "The invalid pending transaction caused exception ${e}", ("e", e) );
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}
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}
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}
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database& _db;
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std::vector< processed_transaction > _pending_transactions;
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};
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/**
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* Set the skip_flags to the given value, call callback,
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* then reset skip_flags to their previous value after
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* callback is done.
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*/
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template< typename Lambda >
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void with_skip_flags(
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database& db,
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uint32_t skip_flags,
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Lambda callback )
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{
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node_property_object& npo = db.node_properties();
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skip_flags_restorer restorer( npo, npo.skip_flags );
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npo.skip_flags = skip_flags;
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callback();
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return;
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}
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/**
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* Empty pending_transactions, call callback,
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* then reset pending_transactions after callback is done.
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*
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* Pending transactions which no longer validate will be culled.
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*/
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template< typename Lambda >
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void without_pending_transactions(
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database& db,
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std::vector<processed_transaction>&& pending_transactions,
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Lambda callback )
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{
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pending_transactions_restorer restorer( db, std::move(pending_transactions) );
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callback();
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return;
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}
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} } } // graphene::chain::detail
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