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cleanly handle db upgrade

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This commit is contained in:
Daniel Larimer 2015-10-19 16:48:14 -04:00
parent fc48ecbfc1
commit af589b2287
1 changed files with 41 additions and 3 deletions
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44
libraries/app/application.cpp
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@ -309,9 +309,47 @@ namespace detail {
{
ilog("Replaying blockchain on user request.");
_chain_db->reindex(_data_dir/"blockchain", initial_state());
} else if( clean )
_chain_db->open(_data_dir / "blockchain", initial_state);
else {
} else if( clean ) {
auto is_new = [&]() -> bool
{
// directory doesn't exist
if( !fc::exists( _data_dir ) )
return true;
// if directory exists but is empty, return true; else false.
return ( fc::directory_iterator( _data_dir ) == fc::directory_iterator() );
};
auto is_outdated = [&]() -> bool
{
if( !fc::exists( _data_dir / "db_version" ) )
return true;
std::string version_str;
fc::read_file_contents( _data_dir / "db_version", version_str );
return (version_str != GRAPHENE_CURRENT_DB_VERSION);
};
if( !is_new() && is_outdated() )
{
ilog("Replaying blockchain due to version upgrade");
fc::remove_all( _data_dir / "db_version" );
_chain_db->reindex(_data_dir / "blockchain", initial_state());
// doing this down here helps ensure that DB will be wiped
// if any of the above steps were interrupted on a previous run
if( !fc::exists( _data_dir / "db_version" ) )
{
std::ofstream db_version(
(_data_dir / "db_version").generic_string().c_str(),
std::ios::out | std::ios::binary | std::ios::trunc );
std::string version_string = GRAPHENE_CURRENT_DB_VERSION;
db_version.write( version_string.c_str(), version_string.size() );
db_version.close();
}
} else {
_chain_db->open(_data_dir / "blockchain", initial_state);
}
} else {
wlog("Detected unclean shutdown. Replaying blockchain...");
_chain_db->reindex(_data_dir / "blockchain", initial_state());
}