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walletdb: Handle cursor internally

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Instead of returning a Dbc (BDB cursor object) and having the caller
deal with the cursor, make BerkeleyBatch handle the cursor internally.

This prepares BerkeleyBatch to work with other database systems as Dbc
objects are BDB specific.
This commit is contained in:
Andrew Chow
2020-05-14 21:17:01 -04:00
parent 39bd9ddb87
commit ca24edfbc1
3 changed files with 50 additions and 35 deletions
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51
src/wallet/bdb.cpp
View File

@@ -335,7 +335,7 @@ void BerkeleyEnvironment::CheckpointLSN(const std::string& strFile)
}
BerkeleyBatch::BerkeleyBatch(BerkeleyDatabase& database, const char* pszMode, bool fFlushOnCloseIn) : pdb(nullptr), activeTxn(nullptr)
BerkeleyBatch::BerkeleyBatch(BerkeleyDatabase& database, const char* pszMode, bool fFlushOnCloseIn) : pdb(nullptr), activeTxn(nullptr), m_cursor(nullptr)
{
fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
fFlushOnClose = fFlushOnCloseIn;
@@ -442,6 +442,7 @@ void BerkeleyBatch::Close()
activeTxn->abort();
activeTxn = nullptr;
pdb = nullptr;
CloseCursor();
if (fFlushOnClose)
Flush();
@@ -528,17 +529,15 @@ bool BerkeleyBatch::Rewrite(BerkeleyDatabase& database, const char* pszSkip)
fSuccess = false;
}
Dbc* pcursor = db.GetCursor();
if (pcursor)
if (db.StartCursor()) {
while (fSuccess) {
CDataStream ssKey(SER_DISK, CLIENT_VERSION);
CDataStream ssValue(SER_DISK, CLIENT_VERSION);
int ret1 = db.ReadAtCursor(pcursor, ssKey, ssValue);
if (ret1 == DB_NOTFOUND) {
pcursor->close();
bool complete;
bool ret1 = db.ReadAtCursor(ssKey, ssValue, complete);
if (complete) {
break;
} else if (ret1 != 0) {
pcursor->close();
} else if (!ret1) {
fSuccess = false;
break;
}
@@ -556,6 +555,8 @@ bool BerkeleyBatch::Rewrite(BerkeleyDatabase& database, const char* pszSkip)
if (ret2 > 0)
fSuccess = false;
}
db.CloseCursor();
}
if (fSuccess) {
db.Close();
env->CloseDb(strFile);
@@ -738,27 +739,30 @@ void BerkeleyDatabase::ReloadDbEnv()
}
}
Dbc* BerkeleyBatch::GetCursor()
bool BerkeleyBatch::StartCursor()
{
assert(!m_cursor);
if (!pdb)
return nullptr;
Dbc* pcursor = nullptr;
int ret = pdb->cursor(nullptr, &pcursor, 0);
if (ret != 0)
return nullptr;
return pcursor;
return false;
int ret = pdb->cursor(nullptr, &m_cursor, 0);
return ret == 0;
}
int BerkeleyBatch::ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& ssValue)
bool BerkeleyBatch::ReadAtCursor(CDataStream& ssKey, CDataStream& ssValue, bool& complete)
{
complete = false;
if (m_cursor == nullptr) return false;
// Read at cursor
SafeDbt datKey;
SafeDbt datValue;
int ret = pcursor->get(datKey, datValue, DB_NEXT);
int ret = m_cursor->get(datKey, datValue, DB_NEXT);
if (ret == DB_NOTFOUND) {
complete = true;
}
if (ret != 0)
return ret;
return false;
else if (datKey.get_data() == nullptr || datValue.get_data() == nullptr)
return 99999;
return false;
// Convert to streams
ssKey.SetType(SER_DISK);
@@ -767,7 +771,14 @@ int BerkeleyBatch::ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& s
ssValue.SetType(SER_DISK);
ssValue.clear();
ssValue.write((char*)datValue.get_data(), datValue.get_size());
return 0;
return true;
}
void BerkeleyBatch::CloseCursor()
{
if (!m_cursor) return;
m_cursor->close();
m_cursor = nullptr;
}
bool BerkeleyBatch::TxnBegin()