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dbelliptics.cpp
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dbelliptics.cpp
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#define BOOST_SPIRIT_THREADSAFE
#include "dbelliptics.h"
#include <boost/property_tree/json_parser.hpp>
#include <boost/lexical_cast.hpp>
struct DbAddr
{
dnet_route_entry entry;
};
struct DbAddrCompare
{
bool operator() ( const DbAddr &lhs, const DbAddr &rhs ) const
{
if ( lhs.entry.group_id < rhs.entry.group_id )
return true;
return dnet_addr_cmp( &lhs.entry.addr, &rhs.entry.addr ) < 0;
}
};
DbElliptics::DbElliptics()
: namespace_( "prun" )
{}
void DbElliptics::Initialize( const std::string &configPath )
{
// parse config
ParseConfig( configPath );
std::string logPath = config_.get<std::string>( "log" );
std::string sLogLevel = config_.get<std::string>( "log_level" );
dnet_log_level logLevel = ParseLogLevel( sLogLevel );
std::vector< std::string > remotes;
for( const auto &v : config_.get_child( "remotes" ) )
{
remotes.push_back( v.second.get_value< std::string >() );
}
if ( remotes.size() % 2 == 0 )
throw std::logic_error( "DbElliptics::Initialize: number of remote nodes (" + std::to_string( remotes.size() ) +
" given) must be an odd number to achieve quorum" );
std::vector< int > groups;
for( const auto &v : config_.get_child( "groups" ) )
{
groups.push_back( v.second.get_value< int >() );
}
// init elliptics node
size_t numConnectedNodes = 0;
log_.reset( new file_logger( logPath.c_str(), logLevel ) );
node_.reset( new node( logger( *log_, blackhole::log::attributes_t() ) ) );
for( const std::string &remote : remotes )
{
try
{
node_->add_remote( remote );
++numConnectedNodes;
}
catch( const std::exception &ex ) {}
}
if ( numConnectedNodes <= remotes.size() / 2 )
throw std::logic_error( "DbElliptics::Initialize: couldn't connect to quorum of nodes: " +
std::to_string( numConnectedNodes ) + " connected / " +
std::to_string( remotes.size() ) + " total" );
// create elliptics session
sess_ = std::make_shared< session >( *node_ );
sess_->set_groups( groups );
sess_->set_namespace( namespace_ );
}
void DbElliptics::Shutdown()
{
config_.clear();
sess_.reset();
}
void DbElliptics::Put( const std::string &key, const std::string &value )
{
auto sess = sess_;
if ( sess )
{
std::string kv = namespace_ + std::string( " " ) + key + std::string( " " ) + value;
data_pointer data = data_pointer::from_raw( kv );
auto result = sess->write_data( key, data, 0 );
if ( result.is_valid() )
result.wait();
}
}
void DbElliptics::Delete( const std::string &key )
{
auto sess = sess_;
if ( sess )
{
auto result = sess->remove( key );
if ( result.is_valid() )
result.wait();
}
}
void DbElliptics::GetAll( GetCallback callback )
{
auto sess = sess_;
if ( sess )
{
auto routes = sess->get_routes();
if ( routes.empty() )
throw std::logic_error( "DbElliptics::GetAll: empty routes table" );
std::set< DbAddr, DbAddrCompare > nodesAddr;
for( auto it = routes.begin(); it != routes.end(); ++it )
{
nodesAddr.insert( DbAddr{ *it } );
}
DbKeyToEntry replies;
for( const DbAddr &addr : nodesAddr )
{
dnet_id id;
memset( &id, 0, sizeof( id ) );
dnet_setup_id( &id, addr.entry.group_id, addr.entry.id.id );
IterateNode( sess, id, replies );
}
IterateQuorumReplies( sess, nodesAddr.size(), replies, callback );
}
}
void DbElliptics::IterateNode( const SessionPtr &sess, const dnet_id &id, DbKeyToEntry &replies )
{
auto res = sess->start_iterator( ioremap::elliptics::key( id ),
{}, DNET_ITYPE_NETWORK, 0 );
for( auto it = res.begin(), end = res.end(); it != end; ++it )
{
if ( it->reply()->status != 0 )
continue;
auto response = it->reply();
DbKey key{ response->key };
auto it_r = replies.find( key );
if ( it_r != replies.end() )
{
DbEntry &entry = it_r->second;
entry.groups.push_back( id.group_id );
}
else
{
std::vector<int> groups{ static_cast<int>( id.group_id ) };
DbEntry entry{ groups, response->size };
replies.insert( std::make_pair( key, entry ) );
}
}
}
void DbElliptics::IterateQuorumReplies( const SessionPtr &sess, size_t numRoutes, const DbKeyToEntry &replies, GetCallback callback )
{
const size_t quorum = numRoutes / 2 + 1;
for( auto it = replies.begin(); it != replies.end(); ++it )
{
const DbEntry &entry = it->second;
const std::vector<int> &groups = entry.groups;
if ( groups.size() >= quorum )
{
auto read_result = sess->read_data( it->first.id, groups, 0, entry.size );
auto entries = read_result.get();
const auto &entry = entries.front();
std::string kv = entry.file().to_string();
// check magic header
if ( kv.compare( 0, namespace_.size(), namespace_, 0, namespace_.size() ) != 0 )
continue;
size_t keyStart = namespace_.size() + 1;
size_t keyEnd = kv.find( ' ', keyStart );
if ( keyEnd == std::string::npos )
continue;
std::string key = kv.substr( keyStart, keyEnd - keyStart );
std::string value = kv.substr( keyEnd + 1 );
callback( key, value );
}
}
}
void DbElliptics::ParseConfig( const std::string &configPath )
{
std::ifstream file( configPath.c_str() );
if ( !file.is_open() )
throw std::logic_error( "DbElliptics::ParseConfig: couldn't open " + configPath );
boost::property_tree::read_json( file, config_ );
}
dnet_log_level DbElliptics::ParseLogLevel( const std::string &level ) const
{
if ( !strcasecmp( level.c_str(), "debug" ) )
return DNET_LOG_DEBUG;
if ( !strcasecmp( level.c_str(), "notice" ) )
return DNET_LOG_NOTICE;
if ( !strcasecmp( level.c_str(), "info" ) )
return DNET_LOG_INFO;
if ( !strcasecmp( level.c_str(), "warning" ) )
return DNET_LOG_WARNING;
if ( !strcasecmp( level.c_str(), "error" ) )
return DNET_LOG_ERROR;
return DNET_LOG_INFO;
}
common::IHistory *CreateHistory( int interfaceVersion )
{
return interfaceVersion == common::HISTORY_VERSION ?
new DbElliptics : nullptr;
}
void DestroyHistory( const common::IHistory *history )
{
delete history;
}