diff options
author | Andrew Chow <achow101-github@achow101.com> | 2020-05-14 21:17:01 -0400 |
---|---|---|
committer | Andrew Chow <achow101-github@achow101.com> | 2020-06-22 15:36:23 -0400 |
commit | ca24edfbc1941ed0a3c9586416dae4e84794eb66 (patch) | |
tree | 1cd6eb3d10bb421f399d98df1c7a4340afb1a59c /src | |
parent | 39bd9ddb8783807b9cde6288233e86ad7c85d61f (diff) | |
download | bitcoin-ca24edfbc1941ed0a3c9586416dae4e84794eb66.tar.xz |
walletdb: Handle cursor internally
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.
Diffstat (limited to 'src')
-rw-r--r-- | src/wallet/bdb.cpp | 51 | ||||
-rw-r--r-- | src/wallet/bdb.h | 6 | ||||
-rw-r--r-- | src/wallet/walletdb.cpp | 28 |
3 files changed, 50 insertions, 35 deletions
diff --git a/src/wallet/bdb.cpp b/src/wallet/bdb.cpp index 7ed9c88122..eb62d6664e 100644 --- a/src/wallet/bdb.cpp +++ b/src/wallet/bdb.cpp @@ -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() diff --git a/src/wallet/bdb.h b/src/wallet/bdb.h index 5ed364344b..aac5bc016e 100644 --- a/src/wallet/bdb.h +++ b/src/wallet/bdb.h @@ -211,6 +211,7 @@ protected: Db* pdb; std::string strFile; DbTxn* activeTxn; + Dbc* m_cursor; bool fReadOnly; bool fFlushOnClose; BerkeleyEnvironment *env; @@ -323,8 +324,9 @@ public: return (ret == 0); } - Dbc* GetCursor(); - int ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& ssValue); + bool StartCursor(); + bool ReadAtCursor(CDataStream& ssKey, CDataStream& ssValue, bool& complete); + void CloseCursor(); bool TxnBegin(); bool TxnCommit(); bool TxnAbort(); diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp index 2f6c2b883a..027fc7397b 100644 --- a/src/wallet/walletdb.cpp +++ b/src/wallet/walletdb.cpp @@ -699,8 +699,7 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet) } // Get cursor - Dbc* pcursor = m_batch.GetCursor(); - if (!pcursor) + if (!m_batch.StartCursor()) { pwallet->WalletLogPrintf("Error getting wallet database cursor\n"); return DBErrors::CORRUPT; @@ -711,11 +710,14 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet) // Read next record CDataStream ssKey(SER_DISK, CLIENT_VERSION); CDataStream ssValue(SER_DISK, CLIENT_VERSION); - int ret = m_batch.ReadAtCursor(pcursor, ssKey, ssValue); - if (ret == DB_NOTFOUND) + bool complete; + bool ret = m_batch.ReadAtCursor(ssKey, ssValue, complete); + if (complete) { break; - else if (ret != 0) + } + else if (!ret) { + m_batch.CloseCursor(); pwallet->WalletLogPrintf("Error reading next record from wallet database\n"); return DBErrors::CORRUPT; } @@ -742,10 +744,10 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet) if (!strErr.empty()) pwallet->WalletLogPrintf("%s\n", strErr); } - pcursor->close(); } catch (...) { result = DBErrors::CORRUPT; } + m_batch.CloseCursor(); // Set the active ScriptPubKeyMans for (auto spk_man_pair : wss.m_active_external_spks) { @@ -849,8 +851,7 @@ DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::list<CWal } // Get cursor - Dbc* pcursor = m_batch.GetCursor(); - if (!pcursor) + if (!m_batch.StartCursor()) { LogPrintf("Error getting wallet database cursor\n"); return DBErrors::CORRUPT; @@ -861,11 +862,12 @@ DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::list<CWal // Read next record CDataStream ssKey(SER_DISK, CLIENT_VERSION); CDataStream ssValue(SER_DISK, CLIENT_VERSION); - int ret = m_batch.ReadAtCursor(pcursor, ssKey, ssValue); - if (ret == DB_NOTFOUND) + bool complete; + bool ret = m_batch.ReadAtCursor(ssKey, ssValue, complete); + if (complete) { break; - else if (ret != 0) - { + } else if (!ret) { + m_batch.CloseCursor(); LogPrintf("Error reading next record from wallet database\n"); return DBErrors::CORRUPT; } @@ -880,10 +882,10 @@ DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::list<CWal ssValue >> vWtx.back(); } } - pcursor->close(); } catch (...) { result = DBErrors::CORRUPT; } + m_batch.CloseCursor(); return result; } |