From 58841ef12f6cba1bb622353c1fcaa0e3c6fb46c9 Mon Sep 17 00:00:00 2001
From: Ilya Zhuravlev <zhuravlevilya@ya.ru>
Date: Tue, 23 Oct 2012 01:18:44 +0400
Subject: Add dummy and LevelDB database backends

---
 src/database-leveldb.cpp | 163 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 src/database-leveldb.cpp

(limited to 'src/database-leveldb.cpp')

diff --git a/src/database-leveldb.cpp b/src/database-leveldb.cpp
new file mode 100644
index 000000000..34e153988
--- /dev/null
+++ b/src/database-leveldb.cpp
@@ -0,0 +1,163 @@
+#include "config.h"
+
+#if USE_LEVELDB
+/*
+LevelDB databases
+*/
+
+
+#include "map.h"
+#include "mapsector.h"
+#include "mapblock.h"
+#include "main.h"
+#include "filesys.h"
+#include "voxel.h"
+#include "porting.h"
+#include "mapgen.h"
+#include "nodemetadata.h"
+#include "settings.h"
+#include "log.h"
+#include "profiler.h"
+#include "nodedef.h"
+#include "gamedef.h"
+#include "util/directiontables.h"
+#include "rollback_interface.h"
+
+#include "database-leveldb.h"
+#include "leveldb/db.h"
+
+Database_LevelDB::Database_LevelDB(ServerMap *map, std::string savedir)
+{
+	leveldb::Options options;
+	options.create_if_missing = true;
+	leveldb::Status status = leveldb::DB::Open(options, savedir + DIR_DELIM + "map.db", &m_database);
+	assert(status.ok());
+	srvmap = map;
+}
+
+int Database_LevelDB::Initialized(void)
+{
+	return 1;
+}
+
+void Database_LevelDB::beginSave() {}
+void Database_LevelDB::endSave() {}
+
+void Database_LevelDB::saveBlock(MapBlock *block)
+{
+	DSTACK(__FUNCTION_NAME);
+	/*
+		Dummy blocks are not written
+	*/
+	if(block->isDummy())
+	{
+		return;
+	}
+
+	// Format used for writing
+	u8 version = SER_FMT_VER_HIGHEST;
+	// Get destination
+	v3s16 p3d = block->getPos();
+
+	/*
+		[0] u8 serialization version
+		[1] data
+	*/
+
+	std::ostringstream o(std::ios_base::binary);
+	o.write((char*)&version, 1);
+	// Write basic data
+	block->serialize(o, version, true);
+	// Write block to database
+	std::string tmp = o.str();
+
+	m_database->Put(leveldb::WriteOptions(), i64tos(getBlockAsInteger(p3d)), tmp);
+
+	// We just wrote it to the disk so clear modified flag
+	block->resetModified();
+}
+
+MapBlock* Database_LevelDB::loadBlock(v3s16 blockpos)
+{
+	v2s16 p2d(blockpos.X, blockpos.Z);
+
+	std::string datastr;
+	leveldb::Status s = m_database->Get(leveldb::ReadOptions(), i64tos(getBlockAsInteger(blockpos)), &datastr);
+
+        if(s.ok()) {
+                /*
+                        Make sure sector is loaded
+                */
+                MapSector *sector = srvmap->createSector(p2d);
+
+		try {
+                	std::istringstream is(datastr, std::ios_base::binary);
+                   	u8 version = SER_FMT_VER_INVALID;
+                     	is.read((char*)&version, 1);
+
+                     	if(is.fail())
+                             	throw SerializationError("ServerMap::loadBlock(): Failed"
+                                	             " to read MapBlock version");
+
+                     	MapBlock *block = NULL;
+                     	bool created_new = false;
+                     	block = sector->getBlockNoCreateNoEx(blockpos.Y);
+                     	if(block == NULL)
+                     	{
+                             	block = sector->createBlankBlockNoInsert(blockpos.Y);
+                             	created_new = true;
+                     	}
+                     	// Read basic data
+                     	block->deSerialize(is, version, true);
+                     	// If it's a new block, insert it to the map
+                     	if(created_new)
+                             	sector->insertBlock(block);
+                     	/*
+                             	Save blocks loaded in old format in new format
+                     	*/
+
+                     	//if(version < SER_FMT_VER_HIGHEST || save_after_load)
+                     	// Only save if asked to; no need to update version
+                     	//if(save_after_load)
+                        //     	saveBlock(block);
+                     	// We just loaded it from, so it's up-to-date.
+                     	block->resetModified();
+
+             	}
+             	catch(SerializationError &e)
+             	{
+                     	errorstream<<"Invalid block data in database"
+                                     <<" ("<<blockpos.X<<","<<blockpos.Y<<","<<blockpos.Z<<")"
+                                     <<" (SerializationError): "<<e.what()<<std::endl;
+                     // TODO: Block should be marked as invalid in memory so that it is
+                     // not touched but the game can run
+
+                     	if(g_settings->getBool("ignore_world_load_errors")){
+                             errorstream<<"Ignoring block load error. Duck and cover! "
+                                             <<"(ignore_world_load_errors)"<<std::endl;
+                     	} else {
+                             throw SerializationError("Invalid block data in database");
+                             //assert(0);
+                     	}
+             	}
+
+                return srvmap->getBlockNoCreateNoEx(blockpos);  // should not be using this here
+        }
+	return(NULL);
+}
+
+void Database_LevelDB::listAllLoadableBlocks(core::list<v3s16> &dst)
+{
+	leveldb::Iterator* it = m_database->NewIterator(leveldb::ReadOptions());
+	for (it->SeekToFirst(); it->Valid(); it->Next()) {
+		dst.push_back(getIntegerAsBlock(stoi64(it->key().ToString())));
+	}
+	assert(it->status().ok());  // Check for any errors found during the scan
+	delete it;
+}
+
+Database_LevelDB::~Database_LevelDB()
+{
+	delete m_database;
+}
+#endif
-- 
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