void HandleError(const leveldb::Status &status) throw(leveldb_error) {
if (status.ok())
return;
if (status.IsCorruption())
throw leveldb_error("Database corrupted");
if (status.IsIOError())
throw leveldb_error("Database I/O error");
if (status.IsNotFound())
throw leveldb_error("Database entry missing");
throw leveldb_error("Unknown database error");
}
void HandleError(const leveldb::Status &status) noexcept(false) {
if (status.ok())
return;
LogPrintf("%s\n", status.ToString());
if (status.IsCorruption())
throw leveldb_error("Database corrupted");
if (status.IsIOError())
throw leveldb_error("Database I/O error");
if (status.IsNotFound())
throw leveldb_error("Database entry missing");
throw leveldb_error("Unknown database error");
}
bool LevelDBDatabase::remove(const LevelDBSlice& key)
{
leveldb::WriteOptions writeOptions;
writeOptions.sync = true;
const leveldb::Status s = m_db->Delete(writeOptions, makeSlice(key));
if (s.ok())
return true;
if (s.IsNotFound())
return false;
LOG_ERROR("LevelDB remove failed: %s", s.ToString().c_str());
return false;
}
bool LevelDBDatabase::get(const LevelDBSlice& key, Vector<char>& value)
{
std::string result;
leveldb::ReadOptions readOptions;
readOptions.verify_checksums = true; // FIXME: Disable this if the performance impact is too great.
const leveldb::Status s = m_db->Get(readOptions, makeSlice(key), &result);
if (s.ok()) {
value = makeVector(result);
return true;
}
if (s.IsNotFound())
return false;
LOG_ERROR("LevelDB get failed: %s", s.ToString().c_str());
return false;
}
extern ERL_NIF_TERM make_status_tuple(ErlNifEnv* env, leveldb::Status status){
const char* type;
if(status.IsNotFound()){
type = "not_found";
}
else if(status.IsCorruption()){
type = "corruption";
}
else if(status.IsIOError()){
type = "io_error";
}
else{
type = "unspecified";
}
const char* stString = status.ToString().c_str();
return enif_make_tuple2(env, enif_make_atom(env, "error"),
enif_make_atom(env, type));
}
static void histogramLevelDBError(const char* histogramName, const leveldb::Status& s)
{
ASSERT(!s.ok());
enum {
LevelDBNotFound,
LevelDBCorruption,
LevelDBIOError,
LevelDBOther,
LevelDBMaxError
};
int levelDBError = LevelDBOther;
if (s.IsNotFound())
levelDBError = LevelDBNotFound;
else if (s.IsCorruption())
levelDBError = LevelDBCorruption;
else if (s.IsIOError())
levelDBError = LevelDBIOError;
HistogramSupport::histogramEnumeration(histogramName, levelDBError, LevelDBMaxError);
}
void LevelDB::checkDbError(leveldb::Status aStatus) throw(DbException) {
if (aStatus.ok())
return;
if (aStatus.IsNotFound())
return;
string ret = Text::toUtf8(aStatus.ToString());
#ifdef _WIN32
if (aStatus.IsCorruption() || aStatus.IsIOError()) {
if (ret.back() != '.')
ret += ".";
ret += " " + STRING_F(DB_ERROR_HINT, STRING(HASHING));
}
#endif
throw DbException(ret);
}
bool LevelDBDatabase::safeGet(const LevelDBSlice& key, Vector<char>& value, bool& found, const LevelDBSnapshot* snapshot)
{
found = false;
std::string result;
leveldb::ReadOptions readOptions;
readOptions.verify_checksums = true; // FIXME: Disable this if the performance impact is too great.
readOptions.snapshot = snapshot ? snapshot->m_snapshot : 0;
const leveldb::Status s = m_db->Get(readOptions, makeSlice(key), &result);
if (s.ok()) {
found = true;
value.clear();
value.append(result.c_str(), result.length());
return true;
}
if (s.IsNotFound())
return true;
LOG_ERROR("LevelDB get failed: %s", s.ToString().c_str());
return false;
}