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Improved resilience of block database against corruption

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This commit is contained in:
Peter Conrad 2017-07-12 21:13:26 +02:00 committed by gladcow
parent cdc89c16ee
commit 42680456b6
2 changed files with 35 additions and 46 deletions
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78
libraries/chain/block_database.cpp
View file

@ -206,34 +206,41 @@ optional<signed_block> block_database::fetch_by_number( uint32_t block_num )cons
return optional<signed_block>();
}
optional<signed_block> block_database::last()const
{
optional<index_entry> block_database::last_index_entry()const {
try
{
index_entry e;
_block_num_to_pos.seekg( 0, _block_num_to_pos.end );
std::streampos pos = _block_num_to_pos.tellg();
if( pos < sizeof(index_entry) )
return optional<index_entry>();
if( _block_num_to_pos.tellp() < sizeof(index_entry) )
return optional<signed_block>();
if( pos % sizeof(index_entry) != 0 )
pos -= pos % sizeof(index_entry);
_block_num_to_pos.seekg( -sizeof(index_entry), _block_num_to_pos.end );
_block_num_to_pos.read( (char*)&e, sizeof(e) );
uint64_t pos = _block_num_to_pos.tellg();
while( e.block_size == 0 && pos > 0 )
{
pos -= sizeof(index_entry);
_block_num_to_pos.seekg( pos );
_block_num_to_pos.read( (char*)&e, sizeof(e) );
if( e.block_size > 0 )
try
{
vector<char> data( e.block_size );
_blocks.seekg( e.block_pos );
_blocks.read( data.data(), e.block_size );
auto result = fc::raw::unpack<signed_block>(data);
return e;
}
catch (const fc::exception&)
{
}
catch (const std::exception&)
{
}
}
if( e.block_size == 0 )
return optional<signed_block>();
vector<char> data( e.block_size );
_blocks.seekg( e.block_pos );
_blocks.read( data.data(), e.block_size );
auto result = fc::raw::unpack<signed_block>(data);
return result;
}
catch (const fc::exception&)
{
@ -241,42 +248,21 @@ optional<signed_block> block_database::last()const
catch (const std::exception&)
{
}
return optional<index_entry>();
}
optional<signed_block> block_database::last()const
{
optional<index_entry> entry = last_index_entry();
if( entry.valid() ) return fetch_by_number( block_header::num_from_id(entry->block_id) );
return optional<signed_block>();
}
optional<block_id_type> block_database::last_id()const
{
try
{
index_entry e;
_block_num_to_pos.seekg( 0, _block_num_to_pos.end );
if( _block_num_to_pos.tellp() < sizeof(index_entry) )
return optional<block_id_type>();
_block_num_to_pos.seekg( -sizeof(index_entry), _block_num_to_pos.end );
_block_num_to_pos.read( (char*)&e, sizeof(e) );
uint64_t pos = _block_num_to_pos.tellg();
while( e.block_size == 0 && pos > 0 )
{
pos -= sizeof(index_entry);
_block_num_to_pos.seekg( pos );
_block_num_to_pos.read( (char*)&e, sizeof(e) );
}
if( e.block_size == 0 )
return optional<block_id_type>();
return e.block_id;
}
catch (const fc::exception&)
{
}
catch (const std::exception&)
{
}
optional<index_entry> entry = last_index_entry();
if( entry.valid() ) return entry->block_id;
return optional<block_id_type>();
}
} }

3
libraries/chain/include/graphene/chain/block_database.hpp
View file

@ -26,6 +26,8 @@
#include <graphene/chain/protocol/block.hpp>
namespace graphene { namespace chain {
class index_entry;
class block_database
{
public:
@ -44,6 +46,7 @@ namespace graphene { namespace chain {
optional<signed_block> last()const;
optional<block_id_type> last_id()const;
private:
optional<index_entry> last_index_entry()const;
mutable std::fstream _blocks;
mutable std::fstream _block_num_to_pos;
};